The methods and systems of discrete information transmission

 

The invention relates to methods and systems of discrete information transmission, in particular to methods and systems of data transmission paths, comprising channels pulse code modulation and analog lines. Technical result achieved - increase data transfer speeds around the track to a data rate in the channel PCM, regardless of the quality of the actual analog communication lines. This result is ensured by the fact that the number of quantization levels for samples that are transmitted over the analogue communication line is selected as low as possible for a given analog communications lines and converting the received analog communication line signal in channel PCM signal to reduce the sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples that are transmitted over the analogue communication line. Marked is achieved by using a shift register designed for sequential write binary count of the bidirectional analogue communication line with a sampling frequency of this bidirectional analogue communication line, and for parallel reading is rmacie contains a modulator connected in series, analog communication line, a direct Converter, the channel pulse code modulation (PCM), inverter, other analog communication line, the demodulator. 4 C. and 8 C.p. f-crystals, 4 Il.

The scope of the invention

This invention relates to methods and systems of discrete information transmission, in particular to methods and systems of data transmission paths, comprising channels pulse code modulation and analog lines.

The existing level of technology

Currently, a major challenge is to increase the speed of data transmission paths, consisting of lines of different nature. Typically, the transmission path information consists of the channel pulse code modulation (PCM), which connects the automatic telephone stations (ATS), which are connected with modems end-user analog communication lines. Such analog (usually telephone) communication line has received the specific name of the "last mile".

Normal channel PCM has a bandwidth of 4 kHz and can transmit eight-bit signal, which is equivalent to the transmission rate of 64 kbit/s Analog communication line of the "last mile" transmits a signal occupying a frequency band not boostie signal/noise 20-25 dB.

The ratio of the speed of information transmission line (channel) communication with a bandwidth of transmission line (channel) communication, power and PWiththe transmitted signal with power PPnoise on the line (channel) communication is determined by the Shannon formula:

For analog communication line with a bandwidth of N=4 kHz and the ratio of the power PWithsignal power PPnoise (signal-to-noise ratio) 42 dB baud rate=55,9 kbit/S. This relationship is derived for the ideal case, in practice, is required to reserve 7-8 dB, i.e., the signal-to-noise ratio will be approximately 50 dB. However, real analog communication lines have a signal-to-noise ratio of about 10-20 dB, which gives the formula (1) speed C=15-30 kbit/s

The known method and system for duplex transmission of discrete information channel PCM, which allows data transfer from the channel PCM to the modem end user with a speed of 56 kbps, but in the reverse direction, the transmission rate of the data in this way does not exceed 33.6 kbps [E. B. Minkin. Anatomy modem 56K technology". // Network and communication systems. 1997, No. 8, pages 54-61 and No. 9, pp. 78-87].

Disadvantages the nearest analogues are unable to increase handling ability, the SJ is equal to the bandwidth of the channel PCM, i.e., 4 kHz.

The closest analogue is the way full duplex transmission of discrete information connected tract containing bidirectional channel PCM, each end of which enters a corresponding bidirectional analogue communication line, namely, that convert the samples to be sending a discrete signal to a form suitable for transmission over the bidirectional analogue communication line; transmit the converted samples of the signal over an analog communication line to the channel PCM; convert received from the analogue communication line signal in channel PCM signal; transmit channel PCM signal on said channel PCM; perform inverse transform of the channel signals after they pass through the channel PCM; transmit the converted channel signals according to another bidirectional analogue communication line; emit signals transmitted by another bidirectional analogue communication line, and convert them into discrete samples [PCT application WO No. 01/99364, H 04 L 27/26, 27.12.2001].

Way full-duplex transmission over a single path can be thought of as independent transmit signals in opposite directions on the two virtual paths. Then we can assume that from the same source [WO 01/99364 A1] WPI is ignal at least the analog communication line and the channel PCM, namely, that convert the samples to be sending a discrete signal to a form suitable for transmission over analog communication line; transmit the converted samples of the signal over an analog communication line to the channel PCM; convert received from the analogue communication line signal in channel PCM signal; transmit channel PCM signal on said channel PCM.

Way full duplex transmission is implemented using the system full-duplex transmission of digital data containing sequentially connected to the first modem, the first bidirectional analogue communication line, the first Converter, the bidirectional channel PCM, the second Converter, the second bidirectional analogue communication line and the second modem [WO 01/99364 A1].

The same way transmission of discrete information on the connected path containing the direction of propagation of at least the analog communication line and the channel PCM, can be implemented using a system of discrete information transmission containing connected in series modulator, the analog communication line, a direct Converter and channel PCM [WO 01/99364 A1].

In that source, as well as simultaneously filed application PCT WO No. 01/99365 described method and system transfer discreetness line 10 dB at the transmission from the subscriber to the equipment PCM. However, analysis of both of these PCT applications shows that the implementation of the specified data rate is used, the conversion of the information signal in eight low-frequency channels, each of which occupies the band from 0 to 4 kHz, and band all eight channels are carried on different frequencies, so that all the channels were occupied bandwidth of 32 kHz. In practice, due to the finite attenuation separation filters and the need to ensure the required isolation between channels total bandwidth of all eight channels will be greater than 32 kHz; otherwise it is necessary to reduce the bandwidth consumed by each channel, which will lead to distortion of the signal being transmitted.

The invention

The purpose of the present invention is to develop such methods and systems for transmission of discrete information that would allow to obtain the technical result consists in a real increase in the speed of data transfer across the path to the data rate in the channel PCM, regardless of the quality of the actual analog communication lines.

This technical result is achieved in the method of transmission of discrete information on the connected path containing the direction of propagation at measures which you want to transfer a discrete signal to mind suitable for transmission over analog communication line; transmit the converted samples of the signal over an analog communication line to the channel PCM; convert received from the analogue communication line signal in channel PCM signal; transmit channel PCM signal on said channel PCM, due to the fact that, according to the first aspect of the present invention, select the range of the signal transmitted over an analog communication line, such that the speed of information transmission on the said analogue communication line is equal to the velocity of information transfer channel PCM, and the number of quantization levels for samples that are transmitted over the analogue communication line, it was the lowest possible for this analogue communication line; and converting the received analog communication line signal in channel PCM signal to reduce the sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples that are transmitted over the analogue communication line.

A feature of this method is that, if there is a connected path in the direction of propagation of the signal from the other analog communication line after channel PCM, perform the inverse transform Canalys channel PCM to the minimum possible for a given analog communication line and in a proportionate increase in the sampling frequency, to the speed of information transmission on the said other analog communication line is equal to the velocity of information transfer channel PCM.

In particular, for channel PCM with a data transmission rate of 64 kbit/s and a bandwidth of 4 kHz is chosen range of the signal transmitted on any analog line, equal to 32 kHz, and the number of quantization levels for samples transmitted by this analogue communication line, is chosen equal to two.

The same technical result is achieved in the transmission of digital data containing sequentially connected to the modulator, the analog communication line, a direct Converter and a channel pulse code modulation (PCM), due to the fact that, according to the second aspect of the present invention, the spectrum of the signal transmitted by the analogue communication line is selected such that the speed of information transmission on the said analogue communication line is equal to the velocity of information transfer channel PCM; the modulator provides a modulated carrier in an analog communication line with the minimum possible for this analogue communication line number of quantization levels for samples transmitted by this analogue communication line; and direct Converter converts Doc who drove in proportion to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples that are transmitted over the analogue communication line.

The feature of this system is that the output of the channel PCM can be connected serially connected inverter, the other analog communication line and the demodulator, while the reverse Converter reduces the number of quantization levels for samples from the channel PCM to the minimum for the other analog communication line and a proportional increase in the sampling rate to the baud rate on the said other analog communication line is equal to the velocity of information transfer channel PCM, and the demodulator provides demodulation of signals transmitted on the said other analog communication line, at discrete times.

In particular, for channel PCM with a data transmission rate of 64 kbit/s and a bandwidth of 4 kHz, the spectrum of the signal transmitted on any analog line, equal to 32 kHz, and the number of quantization levels for samples transmitted by this analogue communication line is equal to two.

The same technical result is achieved in the way full-duplex transmission of digital data on a connected path containing donapaula the ing analog communication line, namely, that convert the samples to be sending a discrete signal to a form suitable for transmission over the bidirectional analogue communication line; transmit the converted samples of the signal over an analog communication line to the channel PCM; convert received from the analogue communication line signal in channel PCM signal; transmit channel PCM signal on said channel PCM; perform inverse transform of the channel signals after they pass through the channel PCM; transmit the converted channel signals according to another bidirectional analogue communication line; emit signals transmitted by another bidirectional analogue communication line, and convert them into discrete samples, due to the fact that, according to the third aspect of the present invention, select the range of the signal transmitted by each bidirectional analogue communication line, such that the transmission rate information for this bidirectional analogue communication line is equal to the velocity of information transfer channel PCM, and the number of quantization levels for samples transmitted via the bidirectional analogue communication line, was minimal for this bidirectional analogue communication line; converting poluchennogo signal proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples transmitted via the bidirectional analogue communication line, and when converting received from the channel PCM channel signal into a signal for the bidirectional analogue communication line perform the same largest increase in the sampling rate of this signal.

In particular, for the bidirectional channel PCM with a data transmission rate of 64 kbit/s and a bandwidth of 4 kHz is chosen range of the signal transmitted by any of the bidirectional analogue communication line is equal to 32 kHz, and the number of quantization levels for samples transmitted via this bidirectional analogue communication line, is chosen equal to two.

The same technical result is achieved in the system of full-duplex transmission of digital data containing sequentially connected to the first modem, the first bidirectional analogue communication line, the first Converter, the bidirectional channel pulse code modulation (PCM), a second inverter, the second bidirectional analogue communication line, and a second modem, due to the fact that, according to the fourth aspect of the present invention, the spectrum of the signal transmitted by each bidirectional analogue communication line, the choice is stayed speed of information transmission in a bidirectional channel PCM; each modem provides the modulated carrier in the bidirectional analogue communication line with the minimum possible for a given bidirectional analogue communication line number of quantization levels for samples transmitted via this bidirectional analogue communication line, and provides demodulation of signals transmitted on the said bidirectional analogue communication line, in discrete samples; each Converter provides conversion obtained from the bidirectional analogue communication line signal in channel PCM signal with the reduced sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples transmitted via the bidirectional analogue communication line, and reduces the number of quantization levels for samples from the channel PCM to the minimum possible for the bidirectional analogue communication line, and a proportional increase in the sampling rate to the transmission rate information mentioned bidirectional analogue communication line is equal to the velocity of information transfer channel PCM.

In particular, for the bidirectional channel PCM with a data transmission rate of 64 kbit/s ia┼či, equal to 32 kHz, and the number of quantization levels for samples transmitted via this bidirectional analogue communication line is equal to two.

The peculiarity of this system is that each of the first and second converters contains block direct conversion to PCM data unit inverse transformation from PCM and differential unit, the joint input-output of which is for receiving signals from the bidirectional analogue communication line, and for transmitting signals in a bidirectional analogue communication line, separate the output of the differential unit is connected to the input of block direct conversion to PCM, the output of which serves to transmit the channel PCM signal in a bidirectional channel PCM, and a separate input of the differential unit is connected to the output of the inverse transformation from PCM, the entrance of which is for receiving the channel signal to the PCM from the bidirectional channel PCM.

An additional feature of this system is that block direct conversion of PCM is made in the form of a shift register designed for sequential write binary count of the bidirectional analogue communication line with a sampling frequency of this bidirectional analogue communication line, and for parallel obrazovaniya of PCM is made in the form of a shift register, designed for parallel recording of samples of the channel PCM signal with a sampling frequency of channel PCM and for sequential reads binary counts from this shift register with the sampling frequency of the bidirectional analogue communication line.

Brief description of drawings

On the accompanying drawings, the same elements are denoted by the same reference position.

Fig.1 illustrates a General diagram of the communication path that includes the channel PCM and analog communication line in accordance with the present invention.

Fig.2 is a General diagram of a duplex communication path that includes the channel PCM and analog communication line in accordance with the present invention.

Fig.3 illustrates a view of a duplex communication path in the form of two unidirectional virtual circuits.

Fig.4 is a functional diagram of the Converter with blocks direct conversion to PCM and back transformation from PCM in accordance with the present invention.

Detailed description of the invention

In Fig.1 shows a block diagram of a conventional communication path that includes the modulator 1, the first analog line 2 connection, a direct Converter 3, channel 4 pulse code modulation (PCM), reverse pre is to be used by any known or developed modems, allowing as converting digital signals into signals suitable for transmission over analog communication line, and the inverse transform. Examples of such modems can be found in the above article E. B. Minkin. The first and second analog lines 2 and 6 is, for example, an ordinary telephone line (wire or fiber), and any other communication line suitable for transmission of analog signals. Their examples can be found in the book by O. M. Denisiyev, D., Miroshnikov. Means of communication for the last mile. ): Eco-Trends-NTC of companies nateks, 1999, pp. 21-29. Direct Converter 3 and the inverter 5 are described in detail below. Their purpose is to convert, respectively, the analog signals from line 2 communication channel PCM signal and back. 4 channel PCM is a standard transmission equipment pulse code-modulated signals. Example channel PCM can be found in the mentioned article E. B. Minkin.

To the input of the modulator 1 receives transferable discrete signal 8. An example of such a discrete signal are digital data received from the computer - for example e-mail message. From the output of the demodulator 7 is given a discrete signal 9, which praly 9, which is the standard described in the article mentioned above E. B. Minkin, and therefore their detailed description is not given here.

It is shown in Fig.1 path can be shortened in the case, if the digital signal output from the channel 4 PCM is served directly to the consumer, bypassing the second analog communication line 6. In this case, in the circuit according to Fig.1 should be deleted blocks 5-7.

In Fig.2 shows a General block diagram of a duplex communication path that includes partially the same components as the block diagram in Fig.1, but in this case, some of these components have a more complex implementation, described below. New in comparison with Fig.1 in this duplex communication path is the first modem 21 and the second modem 27 included in the place of the former, respectively, of the modulator 1 and the demodulator 7, and the first inverter 23 and the second Converter 25, is included in the path between corresponding analog lines 2 and 6 link and channel 4 PCM instead of the direct Converter 3 and the reverse Converter 5 in Fig.1.

Each of the first and second modems 21, 27 and each of the first and second inverters 23 and 25 includes a differential unit 10. The purpose of this unit 10 is to separate the signals of the forward and reverse channels, pemu the end of analog communication line (2 or 6). Typically, the transmission of signals on the same line in opposite directions is accomplished by passing these signals in frequency so that the spectrum of one of the transferred along this line communication signal does not overlap the spectrum of the signal transmitted on the same line in the opposite direction. Accordingly, differential units 10 provide the desired shift in frequency of the transmitted signals. Examples of differential blocks can be found in the book mentioned above O. M. Denisewas and Forth, Miroshnikov.

In addition to the differential unit 10, each modem 21 or 27 contains the modulator 1 and the demodulator 7. The modulator 1, as in the diagram according to Fig.1, is designed for converting samples of the incoming digital signal 8 corresponding signals transmitted over analog lines (2 or 6) communication. The demodulator 7, as in the diagram according to Fig.1, is designed for converting transmitted over the analogue communication line (2 or 6) signals in the output samples of a discrete signal 9. The output of each modulator 1 is connected to the input of the corresponding differential unit 10, the output of which is connected to the input of the corresponding demodulator 7 in the same modem 21 or 27. A particular type of modulators 1 and demodulators 7 is determined by the species is th phase shift keying (FMN) or hexadecimal quadrature amplitude modulation (CAM), described, for example, in the book C. L. Banquet, C. M. Dorofeev. Digital techniques in satellite communications. - M.: Radio and communication, 1988, pp. 36-45. A specific implementation of differential blocks 10, modulators 1 and demodulators 7 is not included in the scope of patent claims of the present invention.

The first inverter 23 contains the differential unit 10 unit 24 direct conversion to PCM and the block 42 of the reverse conversion from PCM. The purpose of the block 24 direct conversion to PCM corresponds to the purpose of the direct Converter 3 in Fig.1, and the assignment unit 42 inverse transformation from PCM corresponds to the purpose of the reverse Converter 5 in Fig.1. The second inverter 25 contains the differential unit 10 unit 64 direct conversion to PCM, similar to the block 24 in the first inverter 23, and the block 46 of the reverse conversion from PCM, similar to the block 42 in the first inverter 23. The inputs of the blocks 42 and 46 reverse conversion of the PCM receives the appropriate signals PCM out channel 4 PCM. The output of each of the blocks 42 and 46 reverse conversion of the PCM is connected to the input of the differential unit 10 in the corresponding Converter 23 or 25, and the output of this differential unit 10 is attached to the da of each of the blocks 24 or 64 direct conversion to PCM in channel 4 PCM output the PCM. Specific execution units 24, 42, 46 and 64 are disclosed hereinafter in Fig 4.

Fig.3 illustrates the representation of a duplex communication path in the form of two unidirectional virtual circuits. This diagram is conventionally shown two lines of communication produced by the full-duplex (bidirectional) path in Fig.2. In Fig.3, in contrast to Fig.2, each of the analog lines 2 and 6 link and channel 4 PCM presented in two blocks, respectively, 2.1 and 2.2, 4.1 and 4.2, 6.1 and 6.2, where the numbers after the dot indicate the block to the first (direct) or the second (backward) paths. This view duplex communication path in the form of two unidirectional virtual circuits carrying out the transmission in opposite directions, clearly shows that in the case of duplex transmission path is a doubling of the communication path shown in Fig.1. Therefore, taking into account that the transfer of signals in opposite directions occurs in different (non-overlapping) frequency bands due to the presence of differential blocks 10, we can assume that each virtual unidirectional path in Fig.3 operates in exactly the same way as a unidirectional path in Fig.1.

In Fig.4 shows a functional diagram of the first (dz PCM in accordance with the present invention. The second transducer 25 is similarly shown in Fig.4 with the replacement block 24 to block 64, block 42 to block 46.

As can be seen from Fig.4, block 24 direct conversion to PCM is a shift register, a serial input connected to the output of the differential unit 10.23, and parallel outputs connected to respective inputs of channel 4 PCM. Block 42 inverse transformation from PCM also represents a shift register, parallel inputs of which are connected to respective outputs of channel 4 PCM data and a serial output connected to the input of the differential unit 10.23. It should be noted that the questions clocking and synchronization are not included in the scope of claims of the present invention, because they are solved by any known methods such as described in the above-mentioned book C. L. Banquet and C. M. Dorofeev).

The length of the shift registers are used as blocks 24 and 42 in the Converter 23 (respectively 64 and 46 in the transducer 25), is chosen equal to the capacity of a PCM signal. In standard systems, the PCM signal has 8 bits, so the registers of blocks 24, 42, 64 and 46 have a length of 8 feet. However, if necessary, the length of these shift registers can be selected any neobhodimosti line 2 links (from differential unit 10.23 in Fig.2 or line 2.1 in Fig.3). On completion of shift register transfers its contents in parallel to the 4 channel PCM. Thus, the shift register unit 24 performs, first, a series-parallel conversion of the readings coming from the communication line 2, the PCM signals, and secondly, reducing the sampling frequency of the signal being transmitted. The shift register unit 42 performs the inverse transformation, i.e., first, performs parallel-serial conversion signal PCM signal to an analog line, and secondly, increasing the sampling frequency of the signal being transmitted.

It should be noted that a difference of this invention from known analogues is appropriate cohesive selection of the spectrum of the signal transmitted over an analog communication line, and the ratio of the sampling frequency in the analog communication line and the channel PCM. As noted earlier, in the analog communication signals are subject to interference. It is therefore desirable to provide for transmission over analog communication lines with the help of such signals, the immunity which the maximum. This can be achieved by reducing the number of quantization levels for samples that are transmitted over the analogue communication line, to the minimum possible. How modulation, for example FMN or CAM, in which each possible sample of the digital signal corresponds to a continuous signal with a specified frequency and phase. The number of these pre-defined signals and determines the number of quantization levels of the signal transmitted over an analog line. It is obvious that the minimum possible number of quantization levels is 2, when the transmission is carried out using a two-tier (i.e. binary) signal. The dierence between quantization levels is the maximum that will provide better visibility levels of the received signal even in the presence of interference.

Therefore, it is reasonable to choose the number of quantization levels for the signal transmitted over an analog communication line is equal to two. The spectrum of the signal transmitted over an analog communication line, should be chosen such that the transmission speed of the signal in the analog communication line was equal to the speed of signal transmission channel PCM. Thus it is necessary to choose the same ratio of the sampling rates of the signals in the analog communication line and channel PCM as the ratio of the number of quantization levels of the signals in the channel PCM and analog communication line. For example, if the input signal is PCM has 8 binary bits, and the analogue is to be 8 times higher than the sampling frequency of the input signal is PCM. This is the case and discussed above in connection with Fig.4.

Thus it is necessary to choose the range of the signal transmitted over an analog communication line, such that the transmission rate information for this analogue communication line is equal to the velocity of information transfer channel PCM. Given that the bandwidth of the channel PCM equal to 4 kHz, and the transmission rate for an 8-level signal is 64 kbps, the spectrum of the two-level signal transmitted over an analog communication line should be equal to 32 kHz, then the speed of information transmission over analog lines will be equal to 64 kbit/s

If for some reasons in the analog communication line, you must use a signal with a large number of quantization levels, it is necessary to change the width of its spectrum and the above-mentioned ratio of the sampling rates. The same should be done and in that case, if the channel PCM will be used no signal with 8 levels, and with another of their number. When this signal to an analog communication line is not binary, so the shift registers in blocks 24, 42, 64 and 46 will also contain the binary level. For example, if the analog communication line used a four-level signals, differential unit 10 will provide the billing purposes will come from an analog line connection to the serial inputs of the shift register unit 24 (Fig.4). In turn, each stage of the shift register will be performed for this case of double-bit parallel register and the parallel outputs of the shift register in this case will be the outputs of all digit levels. In the case of an 8-level signal in the channel PCM such digit stages of the shift register unit 24 will be 4. The shift register block 42 will have the same performance, but its parallel inputs will serve as inputs all digit levels, and serial output - output the last digit level.

Thus, matching the spectrum of the signal transmitted over an analog communication line (not bandwidth of this analogue communication line), with the bandwidth of the channel PCM allows you to increase the speed of transmission of discrete information on the tract containing the analog communication line along with the channel PCM, up to speed the transmission of information through this channel PCM. Moreover, the number of quantization levels for samples that are transmitted over the analogue communication line, choose the lowest possible for this analogue communication line, and a sampling rate of this signal when it is converted to channel PCM signal is reduced in proportion to the ratio of the number of levels of quanta is the turn of communication.

For existing channels of the PCM data transmission rate is 64 kbps, for eight-bit signal corresponds to 4 kHz. If the spectrum of two-level signal transmitted by the analogue communication line is selected equal to 32 kHz, then from equation (1) will provide that the signal-to-noise ratio, which gives the data transmission rate of 64 kbit/s, is 4.8 dB (it really is 7-8 dB). Given that an ordinary telephone line (i.e., analog communication line) must be normalized signal-to-noise ratio not worse 38-40 dB for a signal in the band from 300 Hz to 3,4 kHz, we find that the expansion of the spectrum of the signal up to 32 kHz (i.e., about 10 times) reduces this rate to 28 to 30 dB. Therefore, the existing telephone line when using them as analog communication lines of the "last mile" can provide the bandwidth tract containing such lines of communication along with the channel PCM equal to the bandwidth of this channel PCM.

Industrial applicability

This invention can be used in communications technology, when the transmission path information includes at least an analog communication line and the channel PCM. The proposed method provides improved throughput ability as a "last mile".

Although the present invention is described with reference to a specific example of implementation, this example in no way limits the scope of patent claims, which is defined by the attached claims based on the use of possible equivalents.

Claims

1. The mode of transmission of discrete information on the connected path containing the direction of propagation of at least the analog communication line and the channel pulse code modulation (PCM), which converts the samples to be sending a discrete signal to a form suitable for transmission over analog communication line, and transmits the converted samples of the signal over an analog communication line to the channel PCM, convert the received analog communication line signal into a channel signal, PCM data transmit channel PCM signal on said channel PCM, characterized in that the chosen range of the signal transmitted over an analog communication line, such to the speed of information transmission on the said analogue communication line is equal to the velocity of information transfer channel PCM, and the number of quantization levels for samples that are transmitted over the analogue communication line, was minimally vozmojnimi signal PCM reduce the sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples that are transmitted over the analogue communication line.

2. The method according to p. 1, characterized in that in the presence of a coherent path in the direction of propagation of the signal from the other analog communication line after channel PCM carry out the inverse transform of the channel signals after they pass through the channel PCM, which consists in reducing the number of quantization levels for samples from the channel PCM to the minimum possible for a given analog communication line and in a proportionate increase in the sampling frequency to the speed of information transmission on the said other analog communication line is equal to the velocity of information transfer channel PCM.

3. The method according to p. 1 or 2, characterized in that the channel PCM with a data transmission rate of 64 kbit/s and a bandwidth of 4 kHz is chosen range of the signal transmitted on any analog line, equal to 32 kHz, and the number of quantization levels for samples transmitted by this analogue communication line is equal to two.

4. The system of discrete information transmission containing connected in series modulator, the analog communication line, a direct Converter and a channel pulse code modulation (PCM), characterized in that the information referred analogue communication line is equal to the velocity of information transfer channel PCM, the modulator provides a modulated carrier in an analog communication line with the minimum possible for this analogue communication line number of quantization levels for samples transmitted by this analogue communication line, a direct Converter converts received from the analogue communication line signal in channel PCM signal with the reduced sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples that are transmitted over the analogue communication line.

5. The system under item 4, characterized in that the output channel PCM connected serially connected inverter, the other analog communication line and the demodulator, while the reverse Converter reduces the number of quantization levels for samples from the channel PCM to the minimum for the other analog communication line and a proportional increase in the sampling rate to the baud rate on the said other analog communication line is equal to the velocity of information transfer channel PCM, the demodulator provides demodulation of signals transmitted on the said other analog communication line, in a discrete and a bandwidth of 4 kHz spectrum signal, transmitted on any analog line, equal to 32 kHz, and the number of quantization levels for samples transmitted by this analogue communication line is equal to two.

7. Way full duplex transmission of discrete information connected tract containing bidirectional channel pulse code modulation (PCM), each end of which enters a corresponding bidirectional analogue communication line, namely, that convert the samples to be sending a discrete signal to a form suitable for transmission over the bidirectional analogue communication line, and transmits the converted samples of the signal over an analog communication line to the channel PCM, convert the received analog communication line signal into a channel signal, PCM data transmit channel PCM signal on said channel PCM, perform the inverse transform of the channel signals after they pass through the channel PCM, transmit the converted channel signals according to another bidirectional analogue communication line, emit signals transmitted by another bidirectional analogue communication line, and convert them into discrete samples, characterized in that the chosen range of the signal transmitted by each bidirectional analogue communication line, such achi information channel PCM, and the number of quantization levels for samples transmitted via the bidirectional analogue communication line, was minimal for this bidirectional analogue communication line, when converting received from the bidirectional analogue communication line signal in channel PCM signal to reduce the sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples transmitted via the bidirectional analogue communication line, and when converting received from the channel PCM channel signal into a signal for the bidirectional analogue communication line perform the same largest increase in the sampling rate of this signal.

8. The method according to p. 7, characterized in that the bidirectional channel PCM with a data transmission rate of 64 kbit/s and a bandwidth of 4 kHz is chosen range of the signal transmitted by any of the bidirectional analogue communication line is equal to 32 kHz, and the number of quantization levels for samples transmitted via this bidirectional analogue communication line is equal to two.

9. System full-duplex transmission of digital data containing sequentially connected to the first modem, the first dacii (PCM), the second Converter, the second bidirectional analogue communication line, and a second modem, wherein the spectrum of the signal transmitted by each bidirectional analogue communication line is selected such that the speed of information transmission on the said bidirectional analogue communication line is equal to the speed of information transmission in a bidirectional channel PCM, each modem provides the modulated carrier in the bidirectional analogue communication line with the minimum possible for a given bidirectional analogue communication line number of quantization levels for samples transmitted via this bidirectional analogue communication line, and provides demodulation of signals transmitted on the said bidirectional analogue communication line, at discrete times, each Converter provides conversion obtained from the bidirectional analogue communication line signal in channel PCM signal with the reduced sampling rate of this signal is proportional to the ratio of the number of quantization levels for samples transmitted over the channel PCM, the number of quantization levels for samples transmitted via the bidirectional analogue communication line, and reduces the number of quantization levels for samples and is the sampling frequency, to the speed of information transmission on the said bidirectional analogue communication line is equal to the velocity of information transfer channel PCM.

10. The system under item 9, characterized in that the bidirectional channel PCM with a data transmission rate of 64 kbit/s and a bandwidth of 4 kHz, the spectrum of the signal transmitted by any of the bidirectional analogue communication line is equal to 32 kHz, and the number of quantization levels for samples transmitted via this bidirectional analogue communication line is equal to two.

11. The system under item 10, wherein each of the first and second converters contains block direct conversion to PCM data unit inverse transformation from PCM and differential unit, the joint input-output of which is for receiving signals from the bidirectional analogue communication line, and for transmitting signals in a bidirectional analogue communication line, separate the output of the differential unit is connected to the input of block direct conversion to PCM, the output of which serves to transmit the channel PCM signal in a bidirectional channel PCM, and a separate input of the differential unit is connected to the output of the inverse transformation from PCM, the entrance of which is for receiving the channel signal is made in the form of a shift register, designed for sequential write binary count of the bidirectional analogue communication line with a sampling frequency of this bidirectional analogue communication line, and for parallel readout of the contents of this shift register with the sampling frequency of the channel PCM, and the block of the inverse conversion of the PCM is made in the form of a shift register designed for parallel recording of samples of the channel PCM signal with a sampling frequency of channel PCM and for sequential reads binary counts from this shift register with the sampling frequency of the bidirectional analogue communication line.

 

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The invention relates to combining the Internet with the phone systems

The invention relates to communication technology, in particular to the transmission of information over switched telephone lines

The invention relates to systems for the transmission and reception by the subscriber alarming information

The invention relates to a device receiving a clock signal to control the network synchronization PBX

The invention relates to electronic signal processing, in particular to the signal processing to reduce the ratio of maximum power to the average radio signals

The invention relates to radio broadcasting and can be used for demodulation and signal correction in the receiver that is designed to work in the system broadcast a digital signal that is compatible with the amplitude-modulated signal

The invention relates to radio broadcasting and can be used for correction of the demodulated signal at the receiver is designed to work in the system broadcast a digital signal that is compatible with the amplitude-modulated signal

The invention relates to radio broadcasting and, in particular, to the modulation formats for digital audio broadcasting (DAB) digital audio broadcasting with frequency modulation type "in band on channel" existing (operating) stations (IBOC-In-Band-On-Channel) and to the broadcasting systems using such modulation formats

The invention relates to receivers for receiving signals digital audio broadcasting

The invention relates to communication and can be used in adaptive synchronous and asynchronous communication systems

The invention relates to techniques for digital communication, namely, devices for diskriminirovaniya digital information in transmission systems with a temporary seal
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