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

FIELD: electric communications; telephone communication systems 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, provided with digital data 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; device also has controlled amplifier. EFFECT: improved design. 3 dwg, 1 tbl