SU930664A1 - Device for delta-modulation with digital adaptation - Google Patents

Description

(B) DELTA MODULE WITH DIGITAL

ADAPTATION

one

The invention relates to the field of telecommunications and can be used in the development of digital signal transmitters.

A device containing a delta modulator, adaptive logic, a counter, a frequency divider, two pulse generators l is known.

A disadvantage of the known device is its complexity.

A device containing a high-frequency delta modulator, the signal input of which is connected to the input signal bus, the first clock generator and the second clock generator, the output of which is connected to the trigger input of the trigger, the first output of which is connected to the input of logic unit 2, is known.

A disadvantage of this device is its complexity and, consequently, its low reliability.

The purpose of the invention is to increase reliability.

The goal is achieved in that a delta modulation device containing a high frequency delta modulator, whose signal output is connected to the input signal bus, the first clock generator and the second clock generator, the output of which is connected to the counting trigger input, the first output of which connected to the input of the logic unit, a pulse frequency divider, a reversible counter and two AND elements are entered, the outputs of the high-frequency delta modulator are connected to the first inputs of the AND elements, and the second passages which are connected to respective outputs of the flip-flop, whose input is connected informatsipchny

Claims (2)

30 with the output of a reversible counter, the inputs of which are connected to the outputs of the corresponding elements I, the output of the logic unit is connected to the control INPUT of the controlled divider, the input of which is connected to the output of the first pulse integrator, and the output to the clock input of the high-frequency delta modulator. The drawing shows a block diagram of a delta modulation device with digital adaptation. The device contains a high-frequency delta-modulator (VDM) 1, the signal + input of which is connected to the bus 2 of the input signal, a generator of 3 clock and pulses and a generator of clock pulses, the output of which is connected to the counting input of the trigger 5 whose first output is connected to the input logic block 6, the outputs of the modulator 1 are connected to the first inputs of the elements I: 7 and oi whose second inputs are connected to the corresponding outputs of the trigger F, whose information input is connected to the output of the reversing counter 9, the inputs of which are connected with And 7 and 8 elements, the output of block 6 is connected to the corresponding outputs of elements 7 and 8, the output of block 6 is connected to the control input of the controlled divider 10, the input of which is connected to the output of the generator 3, and the output to the synchronizing input of the modulator 1 . A delta-modulator device with digital adaptation works as follows. The analog input signal f (t) fed to bus 2 is fed to delta modulator torus 1, operating at a high clock frequency, which ensures high quality analog-de conversion. The output of VDM 1 has two numerical sequences, which are forward and inverse delta signals, which are fed through elements 7 and 8, respectively, to the inputs of the reversible counter 9. Moreover, if the last bit is connected to a clocked trigger 5. the timing is in position 1 — the element Viv opens in the counter 9, the pulses are summed, in the other case the element 7 opens and the counter 9 subtracts the pulses. The triggering of the trigger 5 is carried out at the frequency F /. / OT of the low-frequency generator. The logic block 6 controls, depending on the signal at the output of the three | - hera 5, the division factor of the divider 10, which allows digital companding. Thus, the proposed device, keeping the parameters known, is much simpler than it. DETAILED DESCRIPTION OF THE INVENTION A delta modulation device with a digital adaptation, comprising a high frequency delta modulator, the main input of which is connected to the input signal bus, the first clock generator and the second clock generator, the output of which is connected to the trigger input of the trigger, the first output of which connected to the input of the logic unit, which is disconnected by the fact that, in order to increase reliability, a pulse frequency divider, a reversible counter and two AND elements are introduced into it, with the outputs of high-frequency delta-m The actuator is connected to the first inputs of the elements And, the second inputs of which are connected to the corresponding outputs of the trigger, whose information input is connected to the output of the reversible counter, the inputs of which are connected to the outputs of the corresponding elements And, the output of the logic unit is connected to the control input of the controlled divider, whose input connected to the output of the first pulse generator, and the output to the clock input of the high-frequency delta modulator. Sources of information taken into account in the examination 1. US Patent No. 3699566, CL H 03 K 13/22, 1972. 2. US patent number 3652957, cl. H 03 K 13/22, 1972,