ADAPTIVE DELTA CODEC Russian patent published in 2014 - IPC G10L19/00 H04M3/00 

FIELD: radio engineering, communication.

SUBSTANCE: adaptive delta codec includes a source and a receiver of an analogue signal, a digital communication channel, a coder containing a waveform digitizer, a comparator, an inverter, a JK trigger, a transmission adaptation circuit including a voltage divider, an operating transmission amplifier, the first, the second and the third resistors, a capacitor, as well as a clock-pulse generator (CPG), a decoder containing an amplifier, an analogue switch, a low-pass filter, a reception adaptation circuit including a voltage divider, an operating reception amplifier, the first, the second and the third resistors, and a capacitor.

EFFECT: improving transmission quality of a voice signal via digital communication channels at low transmission rate at simultaneous simplification of the device structure.

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