Feedback residue compression for digital speech systems

Details Feedback residue compression for digital speech systems Feedback residue compression for digital speech systems

1975-09-12

1976-08-03

Claffy, Kathleen H.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 14, 179 1555R, G10L 106

Patent

active

039730816

ABSTRACT:
A digital speech compression system uses a predictive feedback loop. The digital speech signals are compressed within the feedback loop for reducing the transmitter bandwidth. The system comprises a first adder into which the digital signal is fed followed by a quantizer and a compression logic. The predictive loop includes a second adder coupled to the compression logic and followed by a digital predictive filter. The output of the filter is impressed in a negative sense on the first adder and in a positive sense on the second adder. Specifically, the quantizer and compression logic may consist of a two-valued limiter followed by a compressor and a converter in the feedback loop or alternatively the limiter may be followed by a converter while the compressor is disposed outside the feedback loop to provide sample by sample compression.

REFERENCES:
patent: 3500441 (1970-03-01), Brolin
patent: 3609551 (1971-09-01), Brown
patent: 3631520 (1971-12-01), Atal
patent: 3769612 (1973-10-01), Yamazaki

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