SU1314460A1 - Device for transmission and reception of messages using delta modulation - Google Patents

Abstract

The invention relates to radio engineering and communications and can be used in digital voice communication systems. The invention increases throughput by reducing the information portion of a digital signal. The device contains a delta modulator 1, two pulse-code-converter converters (ICP) 2 and 3, a shaper 4 of a channel signal, a decoder 5, a comparison unit (BS) 6, a shaper 7 of a delta stream and a delta modulator 8. Information on the state of the ICP 2 from the communication channel in the serial code goes to the decoder 5, from where to block 6, the 2nd input of which receives information on the state of the ICP 3 (binary counter). If the code layers are equal, the clock pulses stop. on the counter and on the delta modulator 8. Thus, chi the delta pulses input to the transmitter and receiver decoder are equal, which is equivalent to accurately reproducing the signal samples at the time of update of the driver 4. The goal is achieved by introducing BS 6, driver 7 of the delta stream and ICP 3. 2 Cp f-ly. 2 Il. and S (L OO x O5 Fig. 1

Description

The invention relates to radio engineering and communications and can be used in digital voice communication systems.

The purpose of the invention is to increase the bandwidth by reducing the information part of a digital signal.

FIG. 1 shows a structural electrical circuit of the device overflowed on a universal register, from where it enters a parallel code at block 6, the second input of which receives information about the state of the second pulse-code transform of body 3, which operates similarly to the first pulse-code transducer of body 2, words coming from the line and from the second account

giving and receiving messages using the second 10 pulse code

cue delta module; Fig. 2 is a structural electrical circuit of an embodiment of the first and second pulse-code converters.

The device for transmitting and receiving messages using delta modulation contains a delta modulator 1, first and second pulse-code converters 2 and 3, a driver 4 of the channel signal, a decoder 5 of the channel signal, a block 6 comparing the driver 7 of the delta stream and a delta modulator 8. The first and second pulse-code converters are made containing the first and second counters 9 and 10, the comparison unit 11, AND 12, the third counter 13 and the AND 14 element,

The device for transmitting and receiving messages using delta modulation operates as follows.

An analog input signal is applied to delta modulator 1. At the output of the delta modulator of the torus, a delta stream is formed at a rate of Fn (bit / s). The output of the delta modulator 1 is connected to the counting input of the first counter 9, the first pulse-code converter 2. The signal from its output goes to the input of the former 4, which converts the parallel code into a serial one. The status information of the second counter 10 is updated in the imaging unit 4 with a period of

T, 1- () T

(Ld

where TO is the sampling period of the delta modulator;

n is the number of bits of the counter. The last condition is necessary for the normal operation of the device. Linear velocity is V, F, n

 . At the receiving end

The information about the state of the first pulse-code converter 2 from the communication channel in the serial code goes to the decoder 5 executed on the universal register, from where it goes to the block 6 in the parallel code, to the second input of which the information about the second pulse arrives. code converter 3 operating similarly to the first pulse-code converter 2, With equality of code words coming from the line and from the second counter 10 of the second pulse-code

0

five

0

the converter 3, the clock pulses are stopped at the second counter 10 and at the delta modulator 8. To ensure the operation of the second pulse code converter 3, the parallel code from the output of block 6 in the driver 7 is converted into a serial one. Thus, the numbers of delta pulses arriving at the input of the local transmitter decoder and receiver decoder are equal, which is equivalent to accurately reproducing the signal samples at the time of update of the driver 4. When the first and second pulse code converters are executed according to claim 3 of the claims in the following way.

The parallel code from the output of the first counter 9 in block 11 is bitwise compared with the parallel code received from the outputs of the second counter 10. In the event of a discrepancy of signals from the outputs of the first and second 5 counters 9 and 10, the signal arriving at the first input is generated element I 12, to the second input of which a signal arrives, making a reduction in the number of pulses in the delta stream and formed by the third counter 13 and the element IS-NOT 14. The signal from the output element is. This And 12 enters the counting input of the second Counter, the parallel code from the output of which is the signal of the first (second) pulse-code converter 2. With such a performance of the first and second pulse-code converters, it is possible to increase the sampling rate of the delta modulator for meeting the conditions necessary for the normal operation of the device, which reduces the quantization noise of speech signals-5.

Claims (3)

Invention Formula 1. Device for sending and receiving messages using delta-mo0 five 31 The pulsations, which on the side of the serially connected delta modulator, the first pulse-code converter and the channel signal former, and on the receiving side, the channel signal decoder and the delta modulator, are throughput by reducing the information part of the digital signal, successively connected comparison block, delta-flow generator and second pulse-code converter, the output of which is connected to ervym input comparator block, the second input of which is connected to the output of the channel decoder of the signal output of the delta stream is connected to the house WMOs delta modulator. Compiled by V. Shevtsov Editor M. Dylyn Tehred V. Kadar Proofreader M. Pojo Order 2219/55 Circulation 902 Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab., D. 4/5 Production and printing company, Uzhgorod, st. Project, 4 144604 2. The device according to claim 1, about tl and -. so that the first and second pulse-code converters are made in the form of binary 5 counters without reset. 3. The device according to claim 1, characterized in that the first and second pulse-code converters are made containing the first fO and second counters whose outputs connected respectively to the first and second inputs of the comparator unit, the output of which is connected to the AND-5 consecutively connected element and the third counter and the IS-NOT element, the output of which is connected to the second input of the AND element, whose output is connected to the input of the second counter, which is the output of the w-1pl20 code-to-converter, the input which is the input of the first counter ive 2