Adaptive delta modulation system

Details Adaptive delta modulation system Adaptive delta modulation system

H - Electricity

03

M

354/69

H03M 3/02 (2006.01)

Patent

CA 1052006

ADAPTIVE DELTA MODULATION SYSTEM ABSTRACT OF THE DISCLOSURE The present invention discloses 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, said system comprises a first means which detects the several preceding bits of said output of said adaptive delta modulation and changes the stepsize of said output, and a second means which counts the output bits of said adaptive delta modulation regardless of said output being "0" or "1", from the time when the stepsize changes, and changes said stepsize independently or with a relation to said first means when the counted value reaches a value which is predetermined in accordance with said quantizing stepsize at that time thereby correcting the mistracking which is generated in an adaptation logic circuit between a coder terminal and decoder terminal. - 1 -

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