Data compression system for voice data

Details Data compression system for voice data Data compression system for voice data

1990-12-11

1992-10-13

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

375122, 381 29, 381 30, G10L 302, H04B 166

Patent

active

051557720

ABSTRACT:
Digital samples of a voice signal are greatly compressed by filtering the samples to separate the information contained in them into several different frequency bands. In each of a succession of time intervals, the dominant filter output value is identified and converted to floating point form including an exponent and a generally truncated mantissa. All other filter output values for that time interval are also converted to floating point form having the same exponent. The mantissas are then further compressed by grouping values associated with each filter and again converting the mantissas in each group to floating point form having a common local exponent and submantissas. The Walsh-Haddamard transfer is also employed.

REFERENCES:
patent: 4449536 (1984-05-01), Weaver
patent: 4503510 (1985-03-01), Weaver
patent: 4852129 (1989-07-01), Schwartz

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