SU762727A1 - Method of multichannel trasmission and reception of impulse-code modulated signals - Google Patents

Description

The invention relates to communication technology and can be used for multi-channel transmission of analog signals, in particular signals of sound rotation, by the method of pulse-code modulation via satellite, radio relay and cable communication lines.

There is a method of multichannel transmission and reception of signals with pulse-mode modulation, which consists in sampling the transmitted channel signals at the transmission, quantizing them, forming channel code groups, combining them at the reception, separating the channel code groups, and decoding them into the HZ.

However, the known method does not provide the possibility of combining and replacing channels with different sampling frequencies and the number of SYMBOLS IN CODE ^ groups without losing bandwidth.

The aim of the invention is to increase throughput.

2

To do this, in the method of multichannel transmission and reception of signals with pulse-code modulation, which consists in that the transmission transmits the discrete transducer channel signals, quantizes them, forms channel code groups, and combines channel code groups, separates the channel code groups for reception, and decodes them, on the transmission, discretization of the transmitted channel signals with a frequency ^ proportional to the greatest common divider of the sampling frequencies of the transmitted channel signals, and after the formation of the channel nyh code groups is carried memorizing channel code groups for a period equal to the least common multiple of the clock period between the sampled channel signals and naprieme poslerazdeleniya channel code groups produ 'dyatzapominanie kanalnyhkodovyh groups period' equal to the period for storing transmission.

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The proposed method is as follows.

Analog signals of individual channels are sampled with frequencies proportional to the greatest common 5 divider of these frequencies ₍ £ c are quantized by level, encoded with the number of HZ symbols, memorized by groups of £, · η symbols, the T3 memorization period being signal 1 / n. and read out with a clock frequency of the group stream, and ,, separated and recorded 15 groups the reception signals inidividualnyh channels., ίΐη ^ Τ-5 symbols is read from the fast ^Tew * ^{and then} decodes comfort

The drawing shows a communication system for implementing the proposed method.

The communication system comprises a coding device I, storage devices 2 transmission, the transmitter clock 3, a transmitter 4, the signaling generator equipment 5, combiner 6, separating unit 7, the reception memory unit 8, the receiver 9 clock receiver 10 signaling, gene- ₃₀ Office equipment 11 at the reception and decoding! devices 12.

The communication system works as follows.

Individual analog signals ³³ in encoders 1 are sampled with frequencies £ ^ (1 = 1, 2 ,,,, ш), where is the number of signal types proportional to the greatest common divisor of these frequencies, £ c is quantized by level ⁴⁰ and encoded according to required quality by η (ί “1, 2 .., m) characters in the code group. Sampling the signals generated by generator equipment 5 and ⁴⁵ served paral- lel to all the encoding devices 1 of the type (quality grade). The code groups of the channel are formed continuously, the repetition rate of code groups is equal to the sampling rate of ³⁰ CRIs. ...... .....

The signals from the encoders of the coding devices 1 are transferred to the memory devices 2 transmissions. Here, the recording (memorization) is first performed, and ³³ then the reading of groups of £ ^ Hz symbols, the memorization period is equal to the smallest total multiple of the clock periods. The reading of groups from the memory is performed with a clock frequency of the total digital stream, and the moments of reading are divided in time. Groups of characters Combined using the device 6 of the union. Cycle synchronization signals from transmitter 3 and service signals from transmitter 4 are also sent here. The order of the channels is determined by the software device, for example, in the form of a keyboard with character numbers in the memorization period. The total digital stream from the output of the device 6 of the Association is fed into the communication line.

At the reception of the total digital stream through the device 7 separation is fed to the storage device 8 reception, the receiver 9 clock signal and the receiver 10 service signals. The receiver 9 phases the operation of the generator equipment 11, producing read and clocking pulses. The storage devices 8 according to the commands of the receiver 10 are separated from the total digital stream of the group at £ | Hz T symbols of the channel and write them to the storage device. The reading of information is carried out in continuous mode with frequencies -y— _; . Decoding devices 12 convert the signals into analog, which along the connecting lines come to information converters.

The proposed method of multichannel transmission and reception of signals with pulse-code modulation is implemented with the help of audio broadcast signal transmission equipment via satellite communication lines, which has a high throughput.

Claims (1)

Claim The method of multi-channel transmission and reception of signals with pulse-code modulation, which consists in sampling the transmitted channel signals on the transmission, quantizing them-, forming channel code groups and combining channel code groups, and separating channel code groups at the reception, and decoding them, different by the fact that, in order to increase the capacity, transmission of the transmitted channel signals with a frequency, five proportional to the highest common sampling frequency divider of transmitted channel signals and after forming channel code groups, channel code groups are memorized for a period equal to the smallest total multiple between the clock periods of the sampled channel signals, and at the reception after 762727 6 divisions of channel code groups memorize channel code groups for a period equal to the memorization period on the transmission. Sources of information taken into account in the examination 1. Catermuel K, B, Principles of pulse code modulation. M., Communication, 1974, pp. 196-197, 235.