DELTA-MODULATED COMMUNICATING DEVICE Russian patent published in 1998 - IPC

FIELD: electric communications; telephone communication system interfaced with vocoder-type speech converters. SUBSTANCE: device has on sending end input filter, comparator, three-bit shift register, logic circuit, syllable filter, pulse-amplitude modulator, integrator, clock generator; on receiving end, it has three-bit shift register, logic circuit, syllable filter, pulse-amplitude modulator, integrator, output filter, and clock generator. In addition, device is provided with digital data transmission acknowledgement analyzer whose transmitter has switch, pulse generator sync pulse generator, and control circuit; its receiver has switch, comparison circuit, error counter, digital-to-analog converter, sync pulse detector, and control circuit; it also has controlled amplifier. EFFECT: improved design. 3 dwg, 1 tbl