Asynchronous delta modulation The 1947 Deloraine, 1950 Cutler, and 1952 Jager designs were synchronous (or time-quantized). Delta modulation is also possible without a fixed sampling rate. A February 1966 paper by H. Inose "Asynchronous delta-modulation system" uses Schmitt triggers to detect when the input signal exceeds the local demodulator by a predetermined difference, with the benefit of reducing the number of output pulses. A November 1973 paper "Signal Coding Using Asynchronous Delta Modulation" (presented in 1974) investigates an algorithm that varies the sampling rate to transmit fewer samples during periods of small signal variation.
asynchronous delta modulation the 1947 deloraine 1950 cutler and 1952 jager designs were synchronous (or time-quantized) delta modulation is also possible without a fixed sampling rate a february 1966 paper by h inose "asynchronous delta-modulation system" uses schmitt triggers to detect when the input signal exceeds the local demodulator by a predetermined difference with the benefit of reducing the number of output pulses a november 1973 paper "signal coding using asynchronous delta modulation" (presented in 1974) investigates an algorithm that varies the sampling rate to transmit fewer samples during periods of small signal variation