System and method for adpcm transmission of speech or like...

Details System and method for adpcm transmission of speech or like... System and method for adpcm transmission of speech or like...

H - Electricity

03

M

354/68

H03M 7/38 (2006.01) H03M 3/04 (2006.01)

Patent

CA 1226950

0 ABSTRACT An adaptive differential pulse code modulation transmission system is described. It includes a transmitter having a coding circuit which includes a subtractor for providing a difference between an input signal and a first predicted signal and a coder for coding the difference given from the subtrac- tor into a coded signal. A first decoder obtains a first reproduced error signal by decoding the coded signal given from the coder, and a first predic- tor generates the first predicted signal on the basis of the first reproduced error signal from the first decoder. A first control circuit controls the first predictor in response to the input signal and a difference between an internal signal used in the coding circuit and said input signal. The system also includes a receiver having a decoding circuit including a second decoder for receiving the coded signal supplied from the transmitter and decoding the received coded signal into a second reproduced error signal and a second predictor for producing a second predicted signal on the basis of the second reproduced error signal from the second decoder. A decoded signal is produced in response to the second reproduced error signal and the predicted signal; and a second control circuit controls the decoded signal in response to an internal signal used in said second decoding circuit.

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