SU104908A1 - Method for transmitting and receiving messages using delta (pulse difference) modulation and apparatus for transmitting and receiving messages by this method - Google Patents

Description

The invention relates to the field of pulsed multichannel communication systems.

In the known systems based on the use of delta (g. Pulsio-raziness) modulation

(IRM), along with serious technical advantages that distinguish them favorably from systems using pulse code modulation (PIKM), there is a significant drawback. It consists in the fact that, provided that both systems are of the same high quality, the speed of manipulation (the number of pulses per second) at the output of the IRM modulator is higher than the speed of manipulation at the output of the PCM modulator.

The object of the present invention is a method and apparatus for carrying out the transmission and reception of messages, providing for the elimination of this disadvantage in systems using delta (pulse difference) modulation.

The proposed method and apparatus is based on the use of a known win position as the signal reproduction (in terms of signal-to-noise quantization) with a delta (differential) code modulation compared to a delta (pulse-differential) modulation at the same manipulation speed, or more in the speed of manipulation while maintaining the same quality.

The task of reducing the speed of manipulation in systems using delta (pulse difference) modulation is solved by converting the delta (pulse difference) modulation into a delta (differential) code. To do this, at the transmitting end, a counter-decombinator connected to the output of the delta (pulse-difference) modulator and the encoder connected to it are re-encoding the pulses, and a decryptor is used at the receiving end that converts the secondary groups of the second code into pulses, modulated in amplitude.

In the proposed method and arrangement, to streamline the transmission and reception of messages providing for a decrease in the speed of mapiulcpi in systems with a delta (pulse-difference): the modulation for the first time uses the main feature of this modulation, which is that .and the time corresponding to the definition: | e1ik) to the number of n, clock periods T, from one point you can get by 2 n broken trajectories of p p + 1 points. So, if we take the interval of the interchange tj -ti 3 T (phi1 - 1.), then from the point a it is possible to get into 4 points (b, c, d and e), and the number of possible broken motion paths from point a to points 6, c, d and d are equal.

In the general case, the number of clock periods lying in the time interval between t and t.j is associated with the number of points at which broken trajectories can arrive, by the following matching: n, Ig, (ni-1),.

where: P | - the number of clock periods or the degree of the primary code,

and. —number of points, in Kouri come broken trajectories.

Thus, if it is possible for a PaeiM end to be able to account for the number of plus and minus snaps in a combination of a primary code containing n, pulses and distinguish n, + 1 possible values, then these values can be transmitted by a code of lower order, namely code 2 By i.e., it is possible to provide a definition of the total G1 reduction of the transmitted signal over a certain time interval in the form of a binary code group. .

.Based on this. M and the Y1-P1 method of transmitting and receiving messages using delta (pulse difference) modulation

provides, at the transmitting end, a re-encode is received. 1xx on the upstream. modulators of impulse sigals with an isosdullum transform at the receiving end of the group of the secondary code into impulses modulated in amplitude.

Block diagram of the device for Osun | The example of this method is shown in FIG. 2

A counter-decompressor 2 is connected to the output of the delta (pmpulle-difference) modulator /, the purpose of which is to determine the sign and magnitude of the increment for a certain number of 1 x steps of the HI periods. Then, any of (P; - I) increments in a conventional, for example, binary encoder 3 is converted into a secondary code group with a code base n, after which the signals from the output of encoder 3 arrive in a line.

In the receive region, the secondary code groups, after channel separation, are converted by decoder 4 into amplitude modulated pulses (the amplitude can take n, +1 values). The amplitude-modulated pulses received at the output of the decipher 4 are summed in the integrator 5, which is usually used in systems using delta (pulse-difference) modulation;

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1. A method of transmitting and receiving messages using a delta (pulsed-razioyoy) modulation, and with the fact that, in order to reduce the speed of manipulation, the delta (pulse-difference) module is transformed Delta (split) -coding by re-encoding the transmitting end of the pulse signals, the time field of the delta (pulse-voltage) modulator output, and converting the receive code of the secondary code to the pulses at the receiving end; amplitude modulated.

2. A device for carrying out the transmission and reception of messages according to the method described in detail. at

- 3 - HO KM 908

Clause 1, characterized in that it arrives at the code sensor, transferring the transmitting end to the outgoing code combinations from the subdelta (pulse-difference) with a lower degree of the code clause, and the transmitter is connected to the deltator by means of the combinator; im-, „pulses within the combination. Descrambler that converts group-containing n, pulses, from the output of the secondary code into pulses, and which n, 1 different gignon-modular amplitudes.

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