The system and method of smoothing periodic interrupts in the system radio audio

 

The proposed system 100 for smooth periodic interrupts in the system radio audio (AU), in which the main signal (RS) transmitted by a transmitting subsystem 120 and the admission subsystem 140. The output 112 of the source 110 speakers are connected to the modulator M 160 for modulation frequency (RF) signal 162, which is fed to the transmitting antenna (A) 172. The second output 114 source 110 speakers are connected to the circuit 116 delay to make AC a given time delay. Detainee AC comes on M 164 for modulating the second RF signal 166, which is also supplied to the transmitting And 172. Reception subsystem 140 takes as the main PC and the delayed backup PC and gives each of them the corresponding demodulator DM 180, 182. DM 180 includes a circuit 181, which determines the degree of deterioration of the primary RS and outputs a signal 186 to measure the quality of the scheme 190 control mixing. The main speakers, the extracted DM 180, is supplied to a second circuit 184 delay almost equal to the time delay circuit 116 delays. ACE, issued by the circuit 186 delay, and backup AC issued by DM 182, enter the subsystem 135 mixing, providing a smooth transition from the main speakers to the detainee the natives for forming a composite AC, which is supplied to the circuit 150 output speakers. The technical result - improving the efficiency of smoothing periodic interrupt speakers. 7 C. and 41 C.p. f-crystals. 12 Il.

The invention relates to a system and method of smoothing the effects of signal fading time shadows or severe channel distortion in the system broadcast audio. In particular, the system and method provides for the transfer of the main broadcast signal together with the standby signal and the standby signal is transmitted with a time delay given value of the order of several seconds relative to the main broadcast signal. The corresponding delay is used in the receiver in order to make the delay in the received main broadcast signal. In addition, according to this invention extends the concept of detecting deterioration of a primary broadcast channel change due to fading or shadowing RF signal before it will feel listener. Upon detection of such deterioration, damaged the main audio signal is temporarily replaced detainees back signal, which plays the role of "gap filler", in which the main signal is corrupted or missing. Strictly g is audiosignal to the detainee back to the signal.

PRIOR art IN the stationary receiving units, for example, home receivers, the statistics of the fading, in General, stationary, except for the random time of fading due to drive by car or flying an aircraft that gives the possibility to mitigate fading and shading simply by selecting a better antenna or reinstalling an existing antenna. However, in relation to transport statistics of fading and shadows is not fixed as it depends on your location and vehicle speed, and for effective smoothing requires more sophisticated methods.

To improve the quality of broadcasting compared to conventional analog AM and FM broadcasting have been proposed techniques of digital broadcasting audio (CWA). In the U.S., the most widespread of CVA in the band of the main channel (BOCOG) diagram of the digital broadcasting, where is simulcasting analog AM or FM signals together with the signals CWA. A digital audio signal is usually subjected to compression to transmit audio with high fidelity with minimal data transfer rate. Ground system CVA, in most the e impact than in analog modulation systems, such as the commercial AM or FM broadcasting, because these systems CVA do not provide a smooth degradation. This effect is exacerbated for broadcasting systems in the band of the main channel (BOCOG), in which the transmitted power should be in the order of magnitude below the signal power analog broadcasting in the frequency band in which they operate. System CVA POK simultaneously transmit signals analog and digital broadcasting only to the spectral mask, which is required for the analog signal. Thus, the concept of CVA POK allows stations to offer services digital broadcasting at the same time keeping their listeners using analog receivers, but digital broadcasting will not receive recognition, if not to reduce the quality loss of the audio signal resulting from temporary fading and the shadows.

The INVENTION Proposes a system for smoothing periodic interrupts in the system radio audio. The system includes an audio source and transmitting subsystem, the first input of which is connected to the audio source to modulate at least one of the first carrier signal with the audio signal with ccen to the audio source for inclusion in the audio signal of the first predetermined time delay to form at its output the delayed redundant audio signal, and its output connected to the second input of the transmitting subsystem to modulate at least one second carrier signal with the delayed redundant audio signal with the purpose of simulcasting the detainee back of the radio signal together with the main signal. In addition, the system includes a receiving subsystem for receiving a primary signal and a delayed backup radio, and reception subsystem demodulates the main signal, and to generate audio signal at its first output, and demodulates the detainee back signal, giving the detainee a backup of the audio signal at its second output. Receiving subsystem includes a scheme of detecting deterioration of a received main signal and the detection scheme degradation produces a signal quality measurement on the third output of the receiving subsystem. The system includes a second delay circuit, the input of which is connected to the first output of the receiving subsystem for inclusion in the audio signal a second predetermined time delay to form at its output the delayed main signal, and the second preset time delay is almost equal to the first predetermined time delay is the delay and the second and third inputs connected, respectively, to the second and third outputs of the receiving subsystem for combining the first weighting factor with the delayed main audio signal and the second weighting factor with the delayed redundant audio signal and combining the weighted delayed primary audio signal with weighted detainees back the audio signal to form a composite audio signal. The first weighting factor gradually changes from the first value to the second value, provided that the signal quality measurement is less than the specified threshold value. The second weighting factor gradually changes from the second value to the first value, provided that the signal quality measurement is less than the specified threshold value. In addition, the system includes a diagram of the audio signal output connected to the mixing circuit for converting the composite audio signal into an acoustic signal.

According to another aspect, features a method of smoothing periodic interrupts in the system of digital broadcasting audio signal in the band of the main channel. Each channel includes at least one carrier signal, the modulated analog audio signal, and with the stages: (a) make specified the first time delay in the analog audio signal to the modulation at least one carrier signal, and the analog audio signal has a delay relative to the digital representation of the analog audio signal; (b) providing a receiver for receiving at least one modulated carrier signal and the combined modulated subcarriers in order to restore the delayed analog audio signal and the digital representation of the analog audio signal; (c) detecting a given level of deterioration of the quality of the digital representation of the analog audio signal; (d) making the set a second time delay in the digital representation of the analog audio signal and converting the delayed digital representation of the analog audio signal to form a primary audio signal; and (e) substitution of the delayed analog audio instead of the primary audio signal upon detection of a predefined level of quality deterioration.

A BRIEF description of the DRAWINGS Fig.1 is a block diagram of the system according to the invention.

Fig.2A-2G are timing diagrams illustrating one aspect of the present invention.

Fig.3 is a diagram illustrating the range of the broadcasting system in the main channel.

Fig. 5 is a block diagram of the alternative configuration of a fragment of the transmitting subsystem in the digital implementation variant of the present invention.

Fig.6 is a block diagram of a fragment of the receiving subsystem in the digital implementation variant of the present invention.

Fig. 7 is a signal spectrum diagram for another implementation variant of the present invention.

Fig. 8 is a diagram of the spectrum of the signal applied to the digital broadcast audio signal outside the band of the main channel.

Fig. 9 is a diagram of the spectrum of the signal applied to pure analog implementation variant of the present invention.

The DESCRIPTION of preferred embodiments In Fig.1-9, in particular in Fig.1 depicts a system 100 for smooth periodic interrupts in the system radio audio. In the prior art it is known that the smoothing effects of fading or partial shadows in FM radio by switching from a fully stereo audio to mono audio. Some smoothing is due to the fact that for demodulation is osenia signal to noise ratio, than for demodulation monaural information, which is transmitted to the main strip. However, there are some shading, which is so "cut down" the heaviest band in the reception of the audio gap. The system 100 is able to smooth out even such failures in the conventional analogue broadcasting systems and, in particular, adapted for use in digital broadcasting systems audio (CVA), where such failures occur quite often and do not last more than a few seconds. For this smoothing is simulcasting the second signal with the main signal, and the information content of the second signal is a backup audio.

It is extremely important that the second signal was made a significant delay relative to the main broadcast signal. This delay is significantly greater than the processing delay caused by the digital processing system CVA, this delay must be greater than 2.0 seconds and, preferably, should be in the range of 3.0-5.0 seconds.

So, in the system 100 source 110 audio issues an output signal to the transmitting subsystem 120 via line 112 connection. The transmitting subsystem 120 on the things, throwing modulated main signal broadcast in line 163, connected to the output amplifier 170 through the adder 168. The signal 162 of the carrier may be a high frequency signal in the frequency band intended for either AM or FM. In addition, the source 110 of the audio signal produces an output signal 114 to the circuit 116 delay, and circuit 116 delay provides at least two delay the audio. The output of circuit 116 delay is fed to the modulator 164 transmitting subsystem 120 for modulation applied to it the second signal carrier 166. The second signal 166 of the carrier can be a carrier in the specified range of the broadcast signal. Because the audio signal supplied to the modulator 164 is identical to that supplied to the modulator 160, and differs only in the delay relative to the signal, at the output of the modulator 164 is formed detainee back signal, which is supplied to the adder 168 on line 165 connection. The combined output signals of the modulators 160 and 164 are received at the output amplifier 170 transmitting subsystem 120 for submission to the transmitting antenna 172.

Reception subsystem 140 includes an antenna 142 for receiving the signal broadcast from the transmitting antenna 172140. The modulated main audio broadcast is supplied to the main demodulator 180 line connection 146, while the modulated delayed backup audio broadcast is supplied to a second demodulator 182 on line 148 connection. The main demodulator 180 conventional method restores the audio signal source and outputs the restored signal circuit 184 delays. The circuit 184 delay introduces a predetermined delay in the restored main audio signal to supply it to the circuit 150 conclusion. The delay introduced by the circuit 184 delay almost equal to the delay provided by circuit 116 delays. The circuit 184 delay is temporary restore synchronization between the primary audio and secondary audio signal and therefore may introduce a time delay slightly larger or slightly smaller one that gives the scheme 116 delay, depending on other processing delays introduced by one or the other of two parallel communication channels.

The delay introduced by the circuits 116, 184 delay, must be so great to failures occurring on parallel channels, were practically independent, and the probability of failure after such separation was equal to the square of the probability of failure without it failure due to severe distortion. This autocorrelation function is expressed as follows:
R() = E{x(t)x(t-)} (1)
where x(t) is defined as a stochastic process, the probability of loss channel, which is assigned the value "1" in case of loss of the channel and "0" when the clean channel, andis the time offset delays in the passing of the two signals. The probability of failure no explode is expressed as follows:
R=E{x(t)} (2)
Autocorrelation function expresses the probability of a channel failure after correction by explode as a function of the time shift. From a practical point of view, the time shift delay diversity must also be strong enough to give the possibility to detect the distortion of the primary signal and to switch from the primary signal to the standby signal. However, the time shift delay diversity should not be so great that the listener could not at any time to quickly set up a receiving subsystem for the desired channel.

In the absence of interference recovered main signal receives the delay circuit 184 delay, after which comes in the schema 150 output audio through the treatment tip can is audiosignal and backup of the audio signal when the two are combined. The main audio signal supplied from the circuit 184 delay multiplier 194 for multiplying by a weighting factor supplied from the circuit 190 controls the mixing through the line 192 connections. Multiplier 194 weighted and delayed main signal is supplied to the adder 200 for combining with weighted back the audio signal, the value of which in the periods of the interference is equal to "0". With adder 200, the signal at the output of the amplifier 152 schema 150 conclusion. The output amplifier 152 energizes the speaker 154 and 156. As described in the following paragraphs, the main audio signal can, in fact, to be a stereo audio transmitted in a digital form or through the conventional broadcasting world Cup seal. In such circumstances, without audio channels - left and right - are subjected to the delay circuit 184, the weighting scheme 194 and combined with a properly weighted backup signal in the adder 200. Coming from the output of the adder 200 signals of two channels are amplified and fed to a corresponding loudspeaker circuit 150 of the terminal which is marked as a speaker 154 and 156.

Diagram of demodulator 180 includes a circuit 181 detection , proizvodyaschie a measure of the quality of the restored primary audio signal, this measurement includes determining one or more parameters, such as signal-to-noise power level signal and digital signals, the frequency of bit errors and the results of the CRC. Scheme 181 quality measurement produces an output signal on a line 186 to the circuit unit 190 controls the mixing, and in the case of fading or shadowing output signal is below a preset value. If desired, the circuit 182 demodulator is also possible to provide a circuit 183 detection of deterioration in quality, which would control the quality of the restored backup audio and would produce an output signal quality measurement on a line 188 to the circuit unit 190 of the control mix. Circuit unit 190 controls the mixing gives the line 192 weighting factor to control the substitution restored the delayed redundant audio signal instead of the detainee restored main audio. The weight of the output circuit unit 190 controls the mixing is fed to the adder 196, which produces a subtraction of the weight of the unit, giving it the weight value is neither 182 demodulator. Thus, if the disturbance is not detected, the circuit unit 190 controls the mixing produces a single weighting factor, resulting in the output of the adder 196 obtained a value of zero, which is combined with the recovered detainees back the audio signal, the multiplier 198. Since the weighting factor is equal to "0", the standby signal to the adder 200 will not podmahivat to the primary audio.

If the signal quality measuring, incoming line 186, indicates the detection of a sufficient quality to deteriorate, i.e., when the signal quality falls below a predetermined threshold value, the circuit unit 190 controls the mixing modifies the weighting function from the value "1" to "0", making this transition smoothly within a specified period of time. This predetermined time period may be in the range of about 0.25 to1.5 seconds. Thus, during the transition the level of the main audio signal gradually decreases, and the level of reserve signal gradually increases, resulting in a delayed backup audio completely replaces the delayed main signal for the remaining period of the failure, then, depending on the signal quality measurement from "0" to "1" is performed smoothly during the same specified period of time, in order to avoid any clicks and other audiointerface that can replace the user. To implement the smooth transition between the maximum and minimum weight values, you can use a sine lookup function. Because the schema 184 introduces a delay in the main signal before it arrives at the circuit output signal, the circuit 181 quality measurement prevents failure of the main channel of communication. After discovery of such failure remains a few seconds to bring back the audio.

In Fig. 2A depicts a timing diagram representing the transmitted primary and backup audio. Shows the time base of the main audio signal 210 and backup audio signal 220. Backup audio identical to the primary audio signal, but is delayed in time, which are shown with vertical reference lines 213 and 215 that indicates the period 212 delay 212 time. According to the above considerations, the period 212 time delay is the period of time that is longer than 2.0 seconds.

In Fig. 2B depicts the main audio signal 210 and backup the delayed audio signal 220, the time segment 230 which has undergone sufficient interference or fading, tobala 220 relative to the main audio signal 210, a fragment of the main signal 210, which is in the period of 230 time shading corresponds to audiosegment 240 backup audio signal 220. When processed main signal 210, as shown in Fig.2B, the time segment 230 shaded signal can be heard by the user after the time delay set by the scheme 184 delays, according to earlier. However, in response to the detection of the shading, mixing circuit 135 mixes temporary segment 240 backup audio signal 220 to the main audio signal, producing a composite audio signal 225, and the audio signal is formed from the primary audio signal 210 except for the temporary segment 240, during which instead is substituted back the audio signal 220.

In Fig.3 shows one application of the system 100 for CVA POK at which the signal band digital broadcasting 95 modulates subcarriers with orthogonal frequency division are situated on both sides of the FM-modulated carriers. In Fig.3 shows the power spectral density of the signal 241 FM-modulated broadcast signal and 242 and 244 CVA in POK. 95 subcarriers digital broadcasting audio uses range, separated from the middle hour is iosignal block diagram, is depicted in Fig.1, modified to provide digital encoding and decoding, according to Fig.4 and 6.

According Fig. 4, the audio signal source 110 through line 114 to the delay circuit 116, and thence to the modulator 164, as described above. Under this option, the digital broadcasting system audio backup audio signal is an FM-modulated signal, which is included in the delay and which is used in digital audio receivers for replacement, if necessary, damaged digital data. The main audio signal generated in the line 112, is fed to a digital encoder 122. Specific methods of digital encoding and compression are not important to set out here the concept of the invention and can be a conventional digital transmission techniques, for example techniques interleave, convolutional coding and forward error correction. After digital encoding signal on line 124 is fed to the modulator 160, where each of the set of subcarriers is modulated by a given number of bits.

On the receiving end take back the radio signal, which represents the delayed signal to the conventional stereo broadcast with world Cup seal, Toda - the delay circuit 184 and is then transferred to the digital decoder 185. Digital decoder 185 may include facing interleaver and decoder, proactive error correction. After decoding, which may include the detection and correction of errors in the block 185 digital decoding, the signal is converted into an analog audio signal to a digital to analog Converter 187. After this signal passes above-described processing.

Due to the need to achieve equivalence of the respective time delays of the main audio backup audio before they will act on the subsystem 135 mixing scheme, and given that the scheme of the digital processing system CVA POK contribute some delays, it would be desirable to separately compensate for these moments on the path of the backup signal. According Fig.5, this signal comes from a source 110 of the audio connection lines 112 to the digital encoder 122, and thence, through the connecting line 124, the modulator 160, as described above. However, according to the scheme depicted in Fig.5, the analog audio signal is immediately supplied to the modulator 164 through the delay circuit 116, and the digitized audio signal is first fed to a digital decoder 126 change to the primary audio signal, and includes the function of digital-to-analogue conversion, represented by block 187 in Fig.6. So, backup the audio signal subjected to the same delays during processing, the main audio signal, so this sort of delay is not required to compensate any of the circuits 116 and 184 delays. Due to the invariance of such processing delays can be compensated by reducing the delay introduced by the circuit 184 delay, to thereby temporarily lead the main audio signal in synchronism with backup audio.

Another scheme providing backup audio signal shows the signal spectrum is shown in Fig.7. Spectra 246 and 248 of the signal of a single FM channel represent the spectra of the corresponding FM stereo; left + right (L+R) and left - right (L-R). At some distance from this spectrum is the spectrum of the signal corresponding to the Regulations of the Federal communications Commission on FM broadcasting systems, sound equipment and sound reinforcement (RFSK), which is the main signal, where the corresponding subcarriers is modulated signals, CVA. The spectrum of the signal RFX shifted to 53 kHz relative to the average frequency of the FM carrier. As in the system of CVA POK analog stereo Vesi, i.e., the formation of the delayed redundant audio signal.

Outlined above scheme explode time can also be used in the system of CVA out of dormancy. In a purely digital system, where, as can be seen from Fig.8, the spectrum of the digital broadcasting is separate and different from the [spectrum] stations conventional analog FM broadcasting range of 254 main signal CVA with high speed data transmission is complemented by a separate, offset, range 256 backup signal, characterized by a lower data rate. Backup signal CVA has a time delay relative to the main signal, CVA, as in the system of dormancy, where the analog FM signal has a time delay relative to the digital signal. In this case, the digital back signal has a time delay relative to the main digital signal. Both signals have delays in processing, for example, when encoding, interleaving, facing the interleaving, decoding forward error correction and digital to analog conversion. In addition, the latency should be in the range of from 2.0 to 5.0 seconds to create sufficient separation in time so as to provide the desired degree of raskreditovanie between the two p and and for short periods of time, allows you to achieve the economic tradeoff between fidelity and speed of data transmission. Therefore, although the listener can detect a temporary deterioration in the quality of the audio in the process of adding a backup signal, he will not experience failure or any other unwanted artifacts when switching between primary and backup information signals.

Another option for the application described here, the schema explode over time is to increase resilience to the conventional FM broadcast. According to this scheme, the range of broadcast, shown in Fig.9, provides for spectra 246, 248 conventional stereo signal, and the range of 250 signal RFX, which, according to this invention, carries back the audio signal. According to this scheme, FM-stereoimage is the main audio signal and transmitted without delay, while the backup information, which modulates subcarriers RFCS, is delayed by the time period in the range from approximately 2.0 to 5.0 seconds.

Regardless of analog or digital signal is used to broadcast the primary audio, the key to smoothing failures is that the delay of the backup signal relative to the main signal represent the Ana against fading or failure. One limitation on the period of time delay associated with the impact that this delay may have on changing from one station to another. Along with the constraint on time delay, this limitation can be overcome by substituting a redundant signal during intervals settings. Another important point is the scheme according to which the backup audio replaces the main signal during the smoothing process. According to the previously discussed system 100 provides a smooth transition, in which the share reserve of the signal at the input circuit of the output audio signal is gradually increased, while the share of the main signal, which will soon deteriorate gradually decreases. Since the main audio signal is delayed for a period of time greater than 2.0 seconds, the system 100 detects the fading or shadowing the main signal before it could replace the listener, providing time for a smooth and relatively slow transition to the standby signal. Since such substitutions are carried out periodically and for short periods of time, the quality requirements of the backup signal is not so high, as to the quality of the main signal. In relation to the system CVA POK, p is the signal with a lower data rate, modulating one or more subcarriers RFCS or dedicated subcarriers. Reservation conventional analog FM broadcasting can be done using the backup analog signal, modulating subcarriers RFCS. Although all of the above applies to broadcasting in the spectrum of the FM signal, the function explode time and mixing equally applicable to S-band, in particular for digital audio broadcasting in the AM band, in which the conventional analog AM broadcasting can be used as a backup for digital audio broadcast of the same material.

The method of smoothing periodic interruptions in the broadcast audio signal includes the following steps.

Granted the audio signal is used to modulate at least one high-frequency signal. When broadcasting refers to digital broadcasting, the phase modulation includes the step of digital audio encoding. This signal, whether digital or analog, is regarded as the main audio.

In addition, the audio signal shall be entered the first time delay to form the delayed redundant audio signal. Delayed signal, he may have a lower data rate than the main signal. The second high-frequency signal, which can represent subcarriers of the first high-frequency signal is modulated detainees backup audio. Receive the modulated main audio signal and the modulated backup audio and restoring the corresponding audio signals.

At least one radio signal that carries the information of the primary audio signal, a measure of the quality. The quality measurement may include measuring parameters such as signal-to-noise ratio, the frequency of bit errors, the power level of the signal and the results of the CRC.

In the restored main audio recorded the second preset time delay to form the delayed main signal, while the second preset time delay is almost equal to the first predetermined delay time in order to temporarily synchronize the primary audio signal with the delayed redundant audio signal. The time delay is selected from a time period in the range from 2.0 to 5.0 seconds.

Set first weight CSOs threshold value, and moves to 0.0 for a specified period of time, when the result of the quality measurement is less than a predetermined threshold value, which indicates the fading or shadowing of the signal.

Set the second weighting factor and the second weighting factor is equal to 0.0 when the result of measurement of not less than a predetermined threshold value, and turns to 1.0 within a specified period of time, when the result of the quality measurement is less than the specified threshold value. The first weighting factor is combined with the delayed main signal, and the second weighting factor is combined with the delayed redundant audio signal.

Weighted delayed primary audio signal is combined with the weighted detainees back the audio signal to form a composite audio signal.

Finally, the composite audio signal is supplied to the circuit output audio.

The above method is applicable, in particular, in a digital broadcasting signal in which the audio signal source is first subjected to a digital coding, and then used to modulate a high frequency signal. This high-frequency signal may include one or more of podnesushchikh. The second high-frequency signal may constitute a sub-spectrum signal common analog stereo broadcasts with world Cup seal, which introduces a delay, as described previously. Alternatively, backup the audio information can modulate subcarriers RFX signal spectrum of the FM broadcast or, alternatively, the main digital audio signal can modulate one or more high-frequency signals in the spectrum of the signal RFX as a backup signal for broadcasting the main digital audio, either for conventional analog FM broadcast audio.

Although the description of the present invention shown in relation to a specific implementation options, it is clear that within the essence and scope of the present invention it is possible to provide various modifications other than the above, for example, described and depicted herein with specific elements can be replaced by equivalent elements, the individual features can be used independently of other features, and in some cases, some elements of a valid swap and insert between other elements, without going beyond the nature and scope of the invention which are defined at the of periodic interrupts in the system radio audio comprising: an audio source; a transmission medium, the first input of which is connected to the audio source to modulate at least one of the first carrier signal with the audio signal with the goal of broadcasting the main signal; first delay means, whose input is connected to the audio source for inclusion in the audio signal of the first predetermined time delay to form at its output the delayed redundant audio signal, and the output is connected to the second input means of transmission to modulate at least one second carrier signal detainees back audio with the purpose of simulcasting the detainee back of the radio signal together with the main signal; means for receiving a primary signal and a delayed backup signal, and means receiving demodulates the main signal, and to generate audio signal at its first output, and demodulates the detainee back signal, giving the detainee a backup of the audio signal at its second output, the tool receiving includes a means of detecting the deterioration of the reception quality of the main signal, and a detecting deterioration of the quality issues of the signal is the first output means of acceptance for inclusion in the audio signal a second predetermined time delay to form at its output the delayed main signal, the second preset time delay is almost equal to the first predetermined time delay; means mixing the first input of which is connected to the output of the second delay means, and second and third inputs connected, respectively, to the second and third outputs of the means for combining the first weighting factor with the delayed main audio signal and the second weighting factor with the delayed redundant audio signal and combining the weighted delayed primary audio signal with weighted detainees back the audio signal to form a composite audio signal, and the first weighting factor gradually changes from the first value to the second value if the signal quality measurement is less than a predetermined threshold value and the second weighting factor gradually changes from the second value to the first value, provided that the signal quality measurement is less than a predetermined threshold value; and means the audio signal output connected to the mixing tool to convert composite audio signal into an acoustic signal.

2. The system under item 1, characterized in that the first delay time is greater than or equal to 2.0 C.

3. The system under item 1, the source audio signal, and the output connected to the first input means of transmission.

4. The system under item 3, characterized in that it further includes means digital decoding, the input of which is connected to the output of the second delay means and an output connected to the first input means of mixing.

5. The system under item 4, characterized in that the means of detecting the deterioration of the reception quality of the main signal includes means for determining one or more parameters selected from the group consisting of signal-to - noise, frequency bit error, the power level signal and the CRC.

6. The system under item 4, characterized in that the second carrier is at least one compaction subcarriers FM stereo signal in the spectrum of the signal of the FM broadcast.

7. The system under item 6, characterized in that the first carrier is at least one of subcarriers spaced at least 53 kHz from the Central frequency of the spectrum signal of the FM broadcast.

8. The system under item 6, characterized in that the first carrier is at least one of subcarriers RFCS (Regulations of the Federal communications Commission) signal spectrum of the FM broadcast.

9. The system under item 1, characterized in that .

10. The system under item 9, characterized in that the first carrier is at least one of subcarriers RFX signal spectrum of the FM broadcast.

11. The system under item 1, characterized in that the first weighting factor is a function that changes smoothly from 1.0 to 0.0, provided that the signal quality measurement is less than a predetermined threshold value and the second weighting factor is a function that changes smoothly from 0.0 to 1.0, provided that the signal quality measurement is less than the specified threshold value.

12. The method of smoothing periodic interrupt broadcast audio signal, comprising the steps of providing an audio signal; modulating at least one of the first high-frequency signal of the audio signal for transmission of the audio signal as a first radio signal; made in the audio signal of the first predetermined delay time to generate the delayed redundant audio signal; modulating at least one second high-frequency signal detainees backup signal for transmission of the delayed redundant audio signal as the second signal; receiving the first and second radio signals, and extract audio and delayed the n audio signal of the second predetermined delay time to generate the delayed main signal, the second time delay is almost equal to the first time delay; specify the first weighting factor, the first weighting factor is equal to 1.0 when the result of measurement of not less than a predetermined threshold value, and smoothly changes to 0.0 for a specified period of time, when the result of the quality measurement is less than a predetermined threshold value; tasks of the second weighting factor and the second weighting factor is equal to 0.0 when the result of measurement of not less than a predetermined threshold value, and gradually changed to 1.0 for a given period of time, when the result of the quality measurement is less than a predetermined threshold value; combining the first weighting factor with the delayed main audio signal and combining the second weighting factor with the delayed redundant audio signal; combining the weighted delayed primary audio signal with weighted detainees back the audio signal to form a composite audio signal; and providing the schema of the output audio signal and subjected to the composite audio signal.

13. The method according to p. 12, wherein the step of modulating at least one of the first high-frequency step of receiving includes decoding the extracted audio.

15. The method according to p. 12, wherein the step of depositing the first predetermined time delay includes the step of selecting the delay time in the range from approximately 2.0 to 5.0 C.

16. The method according to p. 14, wherein the step of modulating at least one of the first high-frequency signal includes the step of modulating at least one carrier, spaced approximately 130199 kHz from the Central frequency of the spectrum signal of the FM broadcast, the audio signal subjected to digital encoding.

17. The method according to p. 16, wherein the step of modulating at least one second high-frequency signal includes the step of modulating at least one high-frequency signal in the spectrum of the FM signal broadcast detainees backup audio.

18. The method according to p. 16, wherein the step of modulating at least one second high-frequency signal includes the step of modulating at least one subcarrier RFX signal spectrum of the FM broadcast detainees backup audio.

19. The method according to p. 12, wherein the step of measuring includes the step of determining one or more parameters selected from g is playing redundancy.

20. The method of smoothing periodic interrupts in the system of digital broadcasting audio signal in the band of the main channel, where each channel includes at least one carrier signal, the modulated analog audio signal, and a set of subcarriers modulated digital representation of the analog audio signal, comprising the steps: depositing predetermined first time delay in the analog audio signal to modulate at least one carrier signal, and the analog audio signal has a delay relative to the digital representation of the analog audio signal; providing a receiver for receiving as at least one modulated carrier signal, and modulated subcarriers to recover the delayed analog audio signal and the digital representation of the analog audio signal; detecting a specified level of deterioration of the quality of the digital representation of the analog audio signal; making a given second time delay in the digital representation of the analog audio signal and converting the delayed digital representation of the analog audio signal to form the primary audio signal; and substitution of the delayed analog is. the manual broadcasting in the band of the main channel, comprising the steps: providing a first signal for broadcasting; providing a second signal for broadcasting; making delay in one of the two signals, the first or the second, relative to the other of the first and second signals; modulating the first carrier from the first of the first and second signals; modulation with orthogonal frequency division together subcarriers second from the first and second signals, and the set of subcarriers is placed in the upper and lower side bands with respect to the first carrier; combining the first carrier and the subcarriers together for forming a composite signal; and transmitting the composite signal.

22. A method of broadcasting in the band of the main channel under item 21, wherein the first signal is an analog signal and the second signal is a digital signal.

23. A method of broadcasting in the band of the main channel under item 21, wherein the first signal is a digital signal and the second signal is an analog signal.

24. A method of broadcasting in the band of the main channel under item 21, wherein the first signal and the second signal are the same audioformats the frequency; the upper sideband occupies the region from approximately 130 to 199 kHz relative to the first carrier; and the lower sideband occupies an area of about from 130 to 199 kHz relative to the first carrier.

26. A method of broadcasting in the band of the main channel under item 25, wherein each of the side strips, top and bottom, contains 95 subcarriers.

27. Transmitter broadcasting in the band of the main channel, comprising means providing a first signal for transmission; means providing a second signal for transmission; a means of introducing a delay in one of the two signals, the first or the second, relative to the other of the first or second signals; a means of modulating the first carrier from the first of the first and second signals; a means of modulation with orthogonal frequency division together subcarriers second from the first and second signals, and the set of subcarriers is located in the upper and lower side bands with respect to the first carrier; means combining the first carrier and the subcarriers together for forming a composite signal; and means for transmitting the composite signal.

28. Transmitter broadcasting in the band of the main channel under item 27, wherein the first signal predstava the main channel p. 27, characterized in that the first signal is a digital signal and the second signal is an analog signal.

30. Transmitter broadcasting in the band of the main channel under item 27, wherein the first signal and the second signal are the same audio information.

31. Transmitter broadcasting in the band of the main channel under item 27, wherein the first carrier is modulated by frequency, upper sideband occupies the region from approximately 130 to 199 kHz relative to the first carrier; and the lower sideband occupies an area of, approximately, from -130 to -199 kHz relative to the first carrier.

32. Transmitter broadcasting in the band of the main channel under item 31, wherein each of the side strips, top and bottom, contains 95 subcarriers.

33. The way of reception of the broadcast signal in the band of the main channel, which includes the first carrier, the modulated first signal, a set of subcarriers located in the upper and lower side bands with respect to the first carrier, subject to broadcasting and modulated with orthogonal frequency division second signal, according to which one of the signals, the first or the second receives a delay relative to the other of the first and the second Signa signal; demodulation of the subcarriers together for the formation of the second demodulated signal; making delay in one of the demodulated signals, the first or the second, relative to the other of the first or second demodulated signals; selecting one of the demodulated signals, the first or the second, for use in generating the output signal; and generate an output signal depending on the selection of one of the first or second demodulated signals.

34. The way of reception of the broadcast signal in the band of the main channel under item 33, wherein the first signal is an analog signal and the second signal is a digital signal.

35. The way of reception of the broadcast signal in the band of the main channel under item 33, wherein the first signal is a digital signal and the second signal is an analog signal.

36. The way of reception of the broadcast signal in the band of the main channel under item 33, wherein the first signal and the second signal are the same audio information.

37. The way of reception of the broadcast signal in the band of the main channel under item 33, wherein the first modulate the carrier frequency, upper side prasasti, from approximately -130 to -199 kHz relative to the first carrier.

38. The way of reception of the broadcast signal in the band of the main channel under item 37, wherein each of the side strips, top and bottom, contains 95 subcarriers.

39. The way of reception of the broadcast signal in the band of the main channel, under item 33, wherein the step of selecting one of the first or second demodulated signals for use in generating the output signal includes the step of detecting the deterioration of one of the first or the second demodulated signal by determining one or more parameters selected from the group consisting of signal-to-noise, frequency bit error, the power level signal and the CRC.

40. The way of reception of the broadcast signal in the band of the main channel under item 33, wherein the step of selecting one of the first or second demodulated signals for use in generating the output signal includes the steps of issuing a signal quality measurement, representing the first signal; specify the first weighting factor, when the result of the quality measurement is less than a predetermined threshold value; tasks of the second weighting factor, kogenta with the first signal and combining the second weighting factor to the second signal; and combining the weighted first signal with the weighted second signal for forming a composite audio signal; and feeding the composite audio output.

41. The receiver of the broadcast signal in the band of the main channel, which includes the first carrier, the modulated first signal, a set of subcarriers located in the upper and lower side bands with respect to the first carrier, subject to broadcasting and modulated with orthogonal frequency division second signal, in which one of the signals, the first or the second receives a delay relative to the other of the first and second signals, the receiver includes a means of demodulation of the first carrier for the formation of the first demodulated signal, demodulation means the aggregate of subcarriers for the formation of the second demodulated signal, the means of introducing a delay in one of the two demodulated signals, first or second, relative to the other of the first and second demodulated signals, a means of selecting one of the two demodulated signals, the first or the second, for use in generating the output signal, and means forming an output signal depending on the selection of one of the first is causesa fact, the first signal is an analog signal and the second signal is a digital signal.

43. The receiver of the broadcast signal in the band of the main channel under item 41, wherein the first signal is a digital signal and the second signal is an analog signal.

44. The receiver of the broadcast signal in the band of the main channel under item 41, wherein the first signal and the second signal is the same audio information.

45. The receiver of the broadcast signal in the band of the main channel under item 41, wherein the first carrier is modulated in frequency, upper sideband occupies the region from approximately 130 to 199 kHz relative to the first carrier and the lower sideband occupies an area of, approximately, from -130 to -199 kHz relative to the first carrier.

46. The receiver of the broadcast signal in the band of the main channel under item 45, wherein each of the side strips, top and bottom, contains 95 subcarriers.

47. The receiver of the broadcast signal in the band of the main channel under item 41, wherein the means of selecting one of the first or second demodulated signals for use in generating the output signal includes detecting deterioration to the of amerov, selected from the group consisting of signal-to-noise, frequency bit error, the power level signal and the CRC.

48. The receiver of the broadcast signal in the band of the main channel under item 41, wherein the means of selecting one of the first or second demodulated signals for use in generating the output signal includes means for issuing a signal quality measurement, representing the first signal, means specify the first weighting factor, when the result of the quality measurement is less than a predetermined threshold value, the task tool of the second weighting factor when the quality measurement is less than a predetermined threshold value, the merge tool from the first weighting factor to the first signal and combining the second weighting factor to the second signal, and means for combining the weighted first signal with the weighted second signal for forming a composite audio signal, and means for supplying a composite audio output.

 

Same patents:

The invention relates to the technical field of radio communication and can be used for receiving information via the communication channels with the use of noise-like signals

The invention relates to electrical engineering and can be applied in communication systems with abrupt frequency change

The invention relates to measuring devices

The invention relates to the transmission of discrete information and can be used in radio channels to transmit information in communication with moving objects, and Vice-duplex radio control and packet radio networks, operational command communication positional areas

The invention relates to electrical engineering and can be used in the communication system with broadband signals

The invention relates to modulation, transmission and reception of information signals

The invention relates to the field of broadcasting and reception, to the conditional access system for broadcast system, the device generating signals for use in said system

The invention relates to radio communications, in particular to the transmission of digital radio broadcasting, or television signals

The invention relates to information systems and can be used to build systems that distribute textual information multiple sources to multiple subscribers, in which the source itself forms a group, which are conveyed information
The invention relates to the field collection of computer information systems through a survey within the locality of the peripheral terminal of the Central Bank data, in particular the survey by the Central computer terminals located within the locality, and can be used when gathering information about the financial and industrial activity of legal entities
Up!