Method and apparatus for encoding decoding and compression of au

Details Method and apparatus for encoding decoding and compression of au Method and apparatus for encoding decoding and compression of au

1992-01-17

1995-02-28

Knepper, David D.

395 212, 395 233, 395 239, G10L 302, G10L 706

Patent

active

053945085

ABSTRACT:
An audio type signal is encoded. The signal is first divided into bands. For each band, a yardstick signal element is selected. Its magnitude is quantized using a first level of accuracy. This magnitude is used for various purposes, including assigning bits to the different bands, and for establishing reconstruction levels within a band. The magnitude of non yardstick signal elements is quantized with less accuracy than are the yardstick signal elements. The encoded signal is also decoded. Apparatus for both encoding and decoding are also disclosed. The location of the yardstick element within its band may also be recorded and encoded, and used for efficiently allocating bits to non-yardstick signal elements.

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Davidson, Fielder, and Antill, "High Quality Audio Trans: Coding at 128 Kbits/s"ICASSP pp. 1117-1120 Apr. 3-6 Albuquerque, N. Mex. (1990).
Lim, J. S., Two-Dimensional Signal and Image Processing, Prentice Hall Englewood Cliffs New Jersey, p. 598 (1990).
Johnston, J. D., "Transform Coding of Audio Signals Using Perceptual Noise Criteria," IEEE Journal on Selected Areas in Communications, vol. 6, No. 2, Feb. 1988, pp. 314-323.

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