Adaptive delta-modulation system

摘要

A data waveform modulates a carrier to produce a data-waveform-modulated input signal v, which is applied to the input of a delta-modulation transmitter of controllable quantization-step size. The delta-modulated output signal d of the transmitter is fed through a shift register, to the individual stages of which the inputs of a coincidence gate are connected. The output signal of the coincidence gate is transmitted through a narrowband filter tuned to a frequency fs equal to the symbol transmission rate of the data-waveform-modulated input signal v. The narrowband-filter output signal is utilized to control quantization step size.