Method and device for compatible digital broadcasting

 

(57) Abstract:

The invention relates to radio broadcasting. Method of high-frequency broadcasting method includes broadcasting the transmission for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel is provided by the broadcast transmission of amplitude-modulated high-frequency signal with the first frequency spectrum, and the amplitude-modulated high-frequency signal includes a first carrier, amplitude-modulated analog signal of the broadcast program, and the simultaneous broadcast transmission of multiple signals digitally modulated carrier in the frequency band that encompasses the aforementioned first frequency spectrum, each of the signals digitally modulated carrier carries the modulated digital signal of the broadcast program, the first group of signals digitally modulated carrier lying in the first frequency spectrum, modulated in quadrature with the signal of the first carrier and the second and third groups of signals digitally modulated carrier lie outside of the first frequency spectrum and are modulated both in-phase and quadrature signal in the first carrier. Vysokochastotnye mentioned operations. Achievable technical result is the provision of in-band co-channel method of broadcasting, through which a digital representation of the material audio programs or other digital data can be transmitted in an existing broadcast amplitude modulated channel without unwanted interference to existing analog receivers and small changes in the transmitting equipment. 5 C. and 18 h.p. f-crystals, 4 Il.

This invention relates to radio broadcasting and, more specifically, to methods and apparatus for broadcast digital modulation and analog amplitude-modulated signals in the same allocated frequency channel.

There is an increasing interest in the possibility of broadcast signals from the digital coding to provide an improved sound reproduction. It was suggested several approaches, including out-of-band methods, in which the digital signals were transmitted for broadcast in a dedicated frequency bands, and in-band methods, in which high-frequency signals should be transferred to broadcast in free spaces between adjacent channels in the existing wide the use of commercial broadcasters (in-band co-channel approach). In-band approach can be implemented without the need for additional coordination of frequencies and with relatively small changes in the existing transmitting equipment. Of course, any method of digital audio broadcasting (CSV) (DAB) should not worsen the employment of conventional analog receiver circuits.

In-band approaches to digital audio broadcasting still offered only in the range of frequency modulation (FM) (FM) (88 - 108 MHz), and is known from U.S. patent 5278826 and 5278844, because the bandwidth of the channels with amplitude modulation (AM) is very narrow. However, the application of digital audio broadcasting in the AM band (530 - 1700 kHz) supplied by AM broadcast station means to compete with such high-quality portable audio sources, as players, cassette tapes and CDs. It would therefore be desirable to distribute in-band co-channel (ITVC) (IBOC) approach on frequency AM broadcast, to provide enhanced fidelity by applying digital signals without affecting the reception of existing analog AM receivers.

Disclosure of the invention

Method of broadcasting according to this invention uses a composite oscillation, comprising: amchit a first carrier, amplitude modulated analog signal, and a multitude of signals digitally modulated carrier in a frequency range that encompasses the frequency spectrum of the amplitude-modulated high-frequency signal, each of the signals digitally modulated carrier carries digital modulation digital signal, and the first group of signals with digital modulation overlaps the frequency spectrum of the amplitude-modulated high-frequency signal modulated in quadrature with the signal of the first carrier and the second and third groups of signals digitally modulated carrier lie outside the frequency spectrum of the amplitude-modulated high-frequency signal and both modulated in phase and in quadrature with the signal, the first carrier.

The invention also relates to a high-frequency transmitter, comprising: a means for transmitting the composite high-frequency signal with the amplitude-modulated signal that includes the first carrier, amplitude modulated analog signal, and a multitude of signals digitally modulated carrier in a frequency range that encompasses the frequency spectrum of the amplitude-modulated signal, where each of the signals with digital howl modulation overlaps the frequency spectrum of the signal with the analog modulation and modulated in quadrature with the signal, the first carrier, and the second and third group of signals digitally modulated carrier lie outside the frequency spectrum of the signal with analog modulation, and both are modulated in phase and in quadrature with the signal, the first carrier.

The transmitters, which transmit broadcast signals in accordance with this invention, using the modulation method of electrical signals containing operations: receiving amplitude-modulated signal in the first frequency band; receiving a first set of orthogonal quadrature amplitude-modulated carrier in the first frequency band; and receiving the second and third groups quadrature amplitude-modulated carrier in the second and third frequency bands, and the second and third frequency bands comprise frequencies respectively above and below the frequency of the prisoners in the first frequency band.

The invention further relates to high-frequency receiver, comprising: means for receiving both analog and digital parts of the composite high-frequency oscillation, which oscillation includes a first signal with the first carrier, amplitude modulated analog signal, and a multitude of signals digitally modulated carrier in the frequency range to the second signal digitally modulated carrier has a digital modulation digital signal, the first group of signals with digital modulation overlaps the frequency spectrum of the first signal and modulated in quadrature with the signal of the first carrier and the second and third groups of signals digitally modulated carrier lie outside the frequency spectrum of the signal and both modulated in phase and in quadrature with the signal, the first carrier; means for detecting the analog signal on the first carrier; and means for detecting a digital signal on a carrier with digital modulation.

This invention provides in-band co-channel way of broadcasting, through which a digital representation of the material audio programs, or other digital data can be transmitted in the existing AM broadcast channel without unwanted interference to existing analog AM receivers and with relatively small changes in the existing AM transmitting equipment. Transmitters and receivers that transmit and receive signals in accordance with this method of broadcasting are also covered by the invention.

Brief description of drawings

The invention will be immediately clear to the specialists by reference to the accompanying drawings.

Fig. 1 is a spectral whom they posted by according to the present invention.

Fig. 2 is a block diagram of a transmitter constructed according to the present invention.

Fig. 3 is a block diagram of the analyzer of the data used in the transmitter of Fig. 2.

Fig. 4 is a block diagram of a receiver constructed according to the present invention.

Description of the preferred embodiment of the invention

This invention provides a method of simultaneous broadcast transmission as analog amplitude-modulated signal and a digital signal is provided on the same channel as the existing distribution of analogue AM broadcasting. When this method is applied to the AM broadcasting companies, broadcasting can be performed in the same frequency band and on the same carrier frequencies, which is now dedicated to AM broadcast. The method of the broadcast digital signal transmission in the same channel as the analog AM signal, is called in-band co-channel (ITVC) (IBOC) broadcasting. The need to prevent mutual interference imposes restrictions on the digital oscillation, which is placed under analog AM spectrum. This broadcast is performed by the transfer to digital is placed in the spectral region, where a standard AM broadcast signal has significant energy. Other digital carriers are modulated both in-phase and quadrature analog AM signal and placed in the same channel as the analog AM signal, but in spectral regions where the analog AM signal has no significant energy. To obtain orthogonal signals there are a variety of ways. The specific method used to ensure this condition of orthogonality is not part of this invention. In the United States radiation of AM broadcast stations are limited in accordance with the rules of the Federal communications Commission (FCC) (FCC) to be in the template signal levels determined so that the radiation from 10.2 kHz to 20 kHz removed from the analog carrier, must be suppressed by at least 25 dB below the unmodulated analog carrier, the radiation from 20 kHz to 30 kHz, captured with an analog carrier, should be suppressed, at least 35 dB below the unmodulated analog carrier, and radiation from 30 kHz to 60 kHz, captured with an analog carrier, should be suppressed, at least (5+1 dB/kHz) below the level of the unmodulated analog carrier.

Fig. 1 shows the spectrum of A is the standard broadcast signal with the amplitude-modulated carrier, which carrier has a frequency f0. The radiation pattern presented by the FCC position 12. Recent advances in source coding, such as MUSICAM algorithm (adaptive poddiapazona encoding and multiplexing the masked structure of the German Institut fur Rundfunktechnik, showed that high quality audio broadcasting for material stereogram can be achieved by broadcasting digital signals at such low speeds transmission, as 96 kilobits per second (kbps). Fluctuations that provide this data rate can be through the use of effective methods of modulation bandwidth, entered in the template radiation FCC, distributed currently for AM stations.

Carriers with digital modulation in the present invention are generated using orthogonal frequency seal (I want) (OFDM). This format provides the overlap of the spectra of these bearing without any interference in the protective strip, making optimized use of spectrum. However, the protective gaps can be used in the time domain to compensate for jitter-free signals. The method I want particularly advantageous for the successful operation of CSV, because the bandwidth h is there a need to separate the digital bearing CSV from each other by filtering in the transmitter or the receiver, because the orthogonality condition I want to minimize their influence.

Fluctuation I want is composed of a sequence of carrier frequencies of the data posted on 500 Hz. It delivers increased capacity and spectrum allows AM the oscillation ZSV to extend very close to the edge of the template FCC radiation, remaining, however, agreed with him. An additional feature of this approach is that the amplitude of each carrier can adapt to increased signal strength in areas where expected high levels of interaction, such as a position near the carrier frequencies of the interference sources. This strategy gives the optimal distribution of the signal energy and thus maximizes the potential coverage area AM CSV.

In this invention a composite analog and digital oscillation ZSV includes many of the modulated carrier that is fully consistent with the radiation pattern of the FCC. In the preferred implementation of this invention for transferring digital information used bearing 76, separated from each other at 500 Hz. The first group of thirty-four carrier digital modulation posted in the frequency band (f0- 17f1) to (f0+17f<30-40 dB below than the signal level of the unmodulated AM carrier, to minimize crossover distortion with analog AM signal. Crosstalk is reduced further by means of this encoding digital information in such a way as to ensure orthogonality with analog AM oscillation. This type of encoding is called complement coding (for example, complementary Dpfm (BPSK) - dip phase shift keying complementary Cpmn (QPSK) - the four-phase shift keying, or a complement of 32 Stones (QAM) - a 32-point quadrature amplitude shift keying). Complementary modulation Dpfm used on the first pair of digital bearing on the f0f1to facilitate the temporary restoration with schema Kostas (inphase-quadrature carrier recovery scheme). These bearing installed on a level of -25 dB/C (i.e. to the level of average sound pressure scale C-level meter). Eighteen bearing in this first group, posted from f0-10f1to f0-2f1from f0+2f1to f0+10f1, modulated using complementary Cpfm and have a level -39,7 dB/C. the Last fourteen bearing in the first group are placed from f0-17f1to f0-11f1

Additional groups of digital signals with quadrature amplitude modulation placed outside of the first group. The need for these digital hesitate to be in quadrature analog signal is eliminated by limiting the width of the frequency band of the analog AM signal. It does not seem excessive demand as ceramic filters FC commonly found in analog AM receivers, limiting sound amplitude-frequency characteristic up to 3.5 kHz. All carriers in this second group, enclosed in envelopes 16 and 18 in Fig. 1, modulated using 32 Stones. Bearing placed on f0- 19f1f0- 18f1f0+ 18f1and f0+ 19f1have the level of -28 dB/S Bearing, posted from f0- 39f1to f0- 34f1at f0- 21f1f0+ 21f1from f0+ 34f1to f0+ 39f1have the level of -31 dB/C. Other carriers posted from f0- 33f1to f0-22 f1from f0+ 22f1to f0+ 33f1have the level of -32 dB/Sec.

Bearing I want spaced from each other at 500 Hz. However, due to the use of protective strips in the time domain, the speed of transmission symbols for each carrier with sragow speed fr. Nine pairs of complementary bearing Cfmn each containing 2 bits per symbol, which gives a bit rate of fr. Seven pairs of complementary bearing 32 of the Stones are each 5 bits per character, which gives 35frbits per second. 42 individual bearing 32 of the Stones are each 5 bits per character, which gives 210 fr bits per second.

The total data rate for all bearing I want is 264 fror 128 kilobits per second.

Occupied bandwidth in full composite AM signal CSW is 40 kHz when measured at the most remote first digital zeros fluctuations. This range falls within the Central 40-kilohertz part of the pattern of radiation of the FCC. Lateral lobe I want that lie at frequencies f020 kHz lowered below the part of -35 dB/template FCC radiation without additional filtering, because the spacing of the lateral lobes I want from each other is only f1= 500 Hz.

At frequencies 20f1and 40f1there are free intervals I want. This creates additional noise immunity between the first and second adjacent channels, since the predominant component of the AM signal gets to the carrier frequency. Similarly, the AM range CSV not actually busy outside of f020 kHz, to provide protection in the SNO present invention. The analog signal of the broadcast program (which in this example includes left and right stereo components), which is transferable, is applied to the input conclusions 28 and 28'. The left and right channels are combined in block 29 of summation and then fed through the analog sound processor 30 to increase the average analog amplitude modulation from 30% to 85%, which greatly exceeds the range of overlap. Such processors are well known in the analog AM radio stations worldwide. This signal passes through the filter 31 of the lower frequencies with a steep characteristic of the slicer for receiving the filtered monophonic analog signal of the broadcast program on line 32. The filter 31 can, for example, to have a cutoff frequency of 6 kHz and an attenuation of 40 dB at a frequency of 6.5 kHz.

For those applications in which analog and digital part of the transmitted signal will be used to transfer the same program material, digital encoder 34 source that can conform to the ISO MPEG Layer 2A, converts right and left analog signals of broadcast programs in the United stereo digital signal with a speed of 96 kbit/s on the line 36. Coding with direct correction of errors and peremezhaya the signal with a speed of 128 kbps on line 40. For those cases, when transferable digital signal is not a digital version of the analog signal of the broadcast program, for receiving the digital signal provided to the input 42 of the data. There is also an auxiliary source 44 data for those cases in which the digital version of the analog signal of the broadcast program or the digital signal applied to the input 42, should be complemented by the inclusion of additional data.

The analyzer 46 data takes the digital data and generates multiple output signals on lines 48. The signals on the pairs of lines 48 analyzer 46 data represent the complex coefficients, which, in turn, are fed to the algorithm of the fast Fourier transform (FFT) FFT () in block 50, which generates way phase 1 and quadrature Q components of the data signal on lines 52 and 54, respectively. Processed band analog AM signal is converted into a digital signal by the analog-digital Converter 60 and combined with the in-phase part of the digital oscillation ZSV in block 62 summation to obtain a composite signal on line 64. The composite signal on line 64 is converted to an analog signal in d / a Converter IC, generated on line 72 local oscillator 74. Quadrature signal on line 54 is converted into an analog signal by the d / a Converter 76 and filtered by filter 78 of the lower frequencies to obtain a filtered signal, which is combined in the second mixer 80 with a signal on line 82. The signal on line 72, as illustrated, is shifted in phase in block 84 to receive the signal on line 82. The output signals of the mixers 70 and 80 are along the lines 86 and 88 on the block 90 summation to obtain a composite vibrations on line 92. Spurious products offset is suppressed bandpass filter 94, and subsequently, the resulting signal CSW is amplified by the amplifier 96 power for submission to the transmitting antenna 98.

Fig. 3 is a block diagram of the analyzer 46 data in Fig. 2. The data analyzer includes a serial-to-parallel Converter 100, which receives a serial digital signal, as illustrated in the inlet line 40, and generates a number of output signals in the form of digital signals on multiple groups of lines, as illustrated by the groups 102 and 104. Each group of lines is displayed in the encoder of Stones, such as encoders 106 and 108, to issue common mode output signal 1 and quadrature, some encoders of Stones can be used Dpfm and Cpmn.

Fig. 4 is a block diagram of a receiver constructed to receive broadcast digital and analog signals, according to this invention. The antenna 110 receives a composite oscillation containing digital and analog signals, and transmits the signal to the conventional input stage 112, which may include high-frequency preselector, amplifier, mixer and local oscillator. The input stages 112 produces an intermediate frequency signal on line 114. This intermediate frequency signal passes through the circuit 116 automatic gain control generator 118 signals 1/q signal Generator 1/Q produces a common-mode signal 1 on line 120 and the quadrature signal Q on line 122. The output signal of the inphase channel on the line 120 is fed to analog-to-digital Converter 124. Similarly, the output signal of the quadrature channel on the line 122 is supplied to another analog-to-digital Converter 126. The feedback signals on lines 128 and 130 are received in the d / a converters 132 and 134, respectively. The output signals of d / a converters on lines 136 and 138 are used to control circuit 116 automatic gain control. Sakoda on the output stage 142 and further on the loudspeaker 144 or other output device.

Band reject filter 146 filters the in-phase components on the line 128 to exclude energy analog AM signal and to provide a filtered signal on line 148. The circuit 150 of the fast Fourier transform takes the digital signals on lines 148 and 152 and produces output signals on lines 154. These output signals are passed to the equalizer 156 and filter the data transfer rate and the decoder 158 data. The output signal of the decoder data is supplied to the circuit deteremine and decoder 164 forward error correction for enhanced data integrity. The output signal of the circuit deteremine - forward error correction takes place in the decoder 166 source. The output signal of the decoder source is converted into an analog signal by the d / a Converter 160 to receive the signal on line 162, which goes to the output stage 142.

The present invention uses AM oscillation ZSV, which minimizes the amount of changes necessary to convert existing AM radio stations in CSV, because bandwidth is fully inside the template radiation FCC for AM transmission. It is therefore expected, CT in the update however, since the change in group delay in the channel, it is reasonable to keep constant in order to minimize intersymbol distortion to a digital signal, it is considered that it would be less critical for analog AM transmission. It is expected that the existing analog AM transmitters can be left under the condition that the power amplifier operates in a reasonably linear mode. Primary hardware restructuring will be replaced by low-level input carrier signal with the AM agent CSV. This module generates both analog and digital part of the amplitude modulation CSV, and therefore the transmitter operates mainly as a linear amplifier.

Although the present invention is described in terms of the AM digital audio broadcasting system, it is clear that this method can be applied to any system that transmits digital signals with an analog amplitude-modulated signals. In addition, it is clear that sent with the help of digital signal information may differ from the information sent through the analog amplitude-modulated signal. Therefore, the method of the present invention can be used for transmitting data of different types, such as the information the signal. The field of potential applications include amplitude-modulated military messages and television signals, in which the video information modulated in amplitude.

1. Method of high-frequency radio, which broadcast transmission of the first high frequency signal having a first frequency spectrum, and this signal includes the first carrier, amplitude modulated analog signal, perform broadcast transmission of multiple signals digitally modulated carrier in the frequency range that you are carrying out modulation in quadrature with the carrier signal, which encompasses the frequency spectrum of the first signal, wherein each of the said signals digitally modulated carrier has a digital modulation digital signal, the first group mentioned signals digitally modulated carrier block mentioned first frequency spectrum and are modulated in quadrature with said first signal carrier and the second and third groups mentioned signals digitally modulated carrier are mentioned outside of the first frequency spectrum and are modulated both in-phase and in quadrature with said signal is a carrier carry on the frequency of the subset of intervals distributed channels.

3. The method according to p. 1, characterized in that the said bearing digitally modulated excluded from the provisions placed in the middle of the neighboring channels.

4. The method according to p. 1, characterized in that the digital modulation of the carrier in the above-mentioned first group mentioned signals digitally modulated carrier have an amplitude that is less than the amplitude of the signal is unmodulated first carrier.

5. The method according to p. 4, characterized in that the digital modulation of the carrier in the above-mentioned second and third groups mentioned signals digitally modulated carrier have an amplitude that is less than the amplitude of the signal is unmodulated first carrier.

6. The method according to p. 1, characterized in that the signals of these signals digitally modulated carrier lying on the frequency closest to the frequency of the first mentioned carrier, modulate in the format of a two-position phase manipulation.

7. The method according to p. 6, characterized in that the said selected signals of these signals digitally modulated carrier is used as the reference level for signals other than those mentioned signals digitally modulated carrier.

8. The method according to p. 1 different the mi of the same material of the broadcast program.

9. The method according to p. 1, characterized in that the above-mentioned second and third group mentioned signals digitally modulated carrier modulate 32 position quadrature amplitude shift keying.

10. The method according to p. 1, characterized in that the said signals digitally modulated carrier lie within a second frequency spectrum that occupies a bandwidth of 40 kHz.

11. Method of high-frequency broadcasting under item 1, characterized in that the said signals digitally modulated carrier evenly spread in frequency.

12. The method according to p. 11, characterized in that the said signals digitally modulated carrier carry on the frequency of the subset of intervals distributed channels.

13. The method of modulation of electrical signals, which receive the amplitude-modulated signal in the first frequency range, receive a first set of orthogonal quadrature amplitude modulated carrier in said first frequency range, shall receive the second and third groups quadrature amplitude modulated carrier in the second and third frequency bands, characterized in that the second and third frequency bands comprise frequency coorlale on p. 13, characterized in that the said orthogonal quadrature modulated carriers have amplitudes that are smaller than the unmodulated amplitude of the mentioned amplitude-modulated signal.

15. The modulation method on p. 13, characterized in that the above-mentioned second and third groups mentioned quadrature amplitude modulated carrier have amplitudes that are smaller than the unmodulated amplitude of the mentioned amplitude-modulated signal.

16. The method of signal transmission, in which form and then simultaneously transmit many signals digitally modulated carrier in a frequency range that encompasses the frequency spectrum of the first signal, and each of these signals digitally modulated carrier carries digital modulation digital signal, wherein the transmit signal with the first frequency spectrum, the signal includes a first carrier, amplitude modulated analog signal, and the first group mentioned signals digitally modulated carrier block mentioned first frequency spectrum and are modulated in quadrature with said first signal carrier, and the second and third group of UE shall irout as common mode, and in quadrature with said first signal carrier.

17. The method of signal transmission according to p. 16, characterized in that the said carrier signals in said first group mentioned signals digitally modulated carrier have amplitudes that are smaller than the amplitude of the demodulated signal of the first carrier.

18. The method of transmitting signals on p. 17, characterized in that the said carrier signals in said second and third groups mentioned signals digitally modulated carrier have amplitudes that are smaller than the amplitude of the demodulated signal of the first carrier.

19. The method of signal transmission according to p. 16, characterized in that the said analog signal and said digital signal are different views of the same information.

20. The method of signal transmission according to p. 16, characterized in that the second and third group of carrier signals modulate 32-point quadrature amplitude shift keying.

21. The method of signal transmission according to p. 16, characterized in that the said signals digitally modulated carrier evenly spread in frequency.

22. High-frequency transmitter containing a means for simultaneous re the bathroom on the amplitude of the analog signal, many signals digitally modulated carrier in a frequency range that encompasses the frequency spectrum of the first signal, wherein each of the said signals digitally modulated carrier carries digital modulation digital signal, the first group mentioned signals digitally modulated carrier overlaps the frequency spectrum of the first signal and modulated in quadrature with said first signal carrier and the second and third groups mentioned signals digitally modulated carrier lie outside of the frequency spectrum referred to the first signal and the modulated both in-phase and in quadrature with said first signal carrier.

23. High-frequency receiver containing means for receiving both analog and digital parts of the composite high-frequency oscillation, and the oscillation includes a first signal with the first carrier, amplitude modulated analog signal, and a multitude of digital modulation carrier frequency range, and the filter, which encompasses the frequency spectrum of the first signal, wherein each of the said signals digitally modulated carrier carries digital modulation part of the gure is the p first signal and modulated in quadrature with said first signal carrier, and the second and third groups mentioned signals digitally modulated carrier lie outside of the frequency spectrum referred to the first signal and the modulated both in-phase and in quadrature with said first signal carrier, and contains means for detecting the aforementioned analog signal on said first amplitude-modulated carrier, and means for detecting the aforementioned digital signal on said carrier digital modulation.

 

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4 cl, 5 dwg

FIELD: radio communications; digital communication systems.

SUBSTANCE: proposed spectrum-division frequency modulator that incorporates provision for using frequency-modulated signals of high modulation index in communication systems where frequency resources are limited has two multipliers, two phase shifters, smoothing-voltage generator, two amplitude-phase modulators, carrier generator, adder, and frequency shift control unit.

EFFECT: enhanced noise immunity of communication systems.

3 cl, 15 dwg

FIELD: radio engineering.

SUBSTANCE: first calculator calculates soft value Λ of third demodulated symbol of 4 demodulated symbols by subtraction of distance 2a between two demodulated symbols of same axis of indication table from level , quadrature component Yk. Second calculator determines soft value Λ of fourth demodulated symbol by calculating using first variable α. Third calculator calculates soft value Λ of first demodulated signal by subtraction of distance 2a from level of common-mode component Xk. Fourth calculator determines soft value Λ of second demodulated symbol by calculating using second variable β.

EFFECT: higher efficiency.

5 cl, 14 dwg, 12 tbl

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