Method for coding/decoding, coding/decoding device, and videocon

Details Method for coding/decoding, coding/decoding device, and videocon Method for coding/decoding, coding/decoding device, and videocon

1996-11-29

1999-11-09

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704205, 704224, 704229, 704230, G01L 900

Patent

active

059831723

ABSTRACT:
The object of the invention is to provide a coding/decoding method in which degradation of sound quality perceptible by the listener does not occur at an low bit rate. A shift number calculation section of a decoding device divides a frequency domain into at least two sub-bands, and approximates each of normalized transform coefficients in the sub-band whose allocated bit value is less than a predetermined threshold using a quantized value of the transform coefficient in a predetermined sub-band other than the sub-band so as to obtain information concerning the approximation, and a multiplexer multiplexes the information and another signal and transmits them. A de-multiplexer of a decoding device separates the code of information concerning the approximation, and a shift number restore section restores the information based thereon. An approximation coefficient calculation section assigns, based on the information concerning the approximation, the transform coefficient values in the predetermined sub-band to the normalized transform coefficients whose allocated bit value is less than the predetermined threshold.

REFERENCES:
IEEE Journal On Selected Areas In Communications, vol. 6, No. 2, Feb., 1988, "Transform Coding of Audio Signals Using Perceptual Noise Criteria", J.D. Johnston, pp. 314-323.

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