Adaptive delta modulation system for correcting mistracking

Details Adaptive delta modulation system for correcting mistracking Adaptive delta modulation system for correcting mistracking

1974-12-20

1976-11-30

Griffin, Robert L.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 11D, H03K 1322

Patent

active

039952185

ABSTRACT:
The present invention disclosed an adaptive delta modulation system which examines the several preceding bits of an output of the adaptive delta modulation, and discretely changes a quantizing stepsize of said output so as to compand the same. According to the present invention the system detects the several preceding bits of the output of the adaptive delta modulation, changes the stepsize of that output, counts the output bits of the adaptive delta modulation from the time when stepsize changes, regardless of whether the output is "0" or "1", and changes said stepsize when the counted value reaches a value which is predetermined in accordance with the quantizing stepsize at that time thereby correcting the mistracking which is generated in an adaptation logic circuit between a coder terminal and decoder terminal.

REFERENCES:
patent: 3621396 (1971-11-01), Daugherty
patent: 3706944 (1972-12-01), Tewksbury
patent: 3723909 (1973-03-01), Condon
patent: 3766542 (1973-10-01), Tomozawa

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