Method and apparatus for encoding, decoding and compression of a

Details Method and apparatus for encoding, decoding and compression of a Method and apparatus for encoding, decoding and compression of a

1992-05-07

1994-11-29

MacDonald, Allen R.

395 214, 395 238, G10L 900

Patent

active

053697243

ABSTRACT:
An audio type signal is encoded. The signal is first divided into bands. For each band, a yardstick signal element is selected. The yardstick may be the signal element having the largest magnitude in the band, the second largest, closest to the median magnitude, or having some other selected magnitude. 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 also quantized. 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. Split bands may be established, such that each split band includes a yardstick signal element and each full band includes a major and a minor yardstick signal element.

REFERENCES:
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patent: 5222189 (1993-06-01), Fielder
patent: 5230038 (1993-07-01), Fielder et al.
1 Search Report issued in companion PCT/US93/00323, mailed on Apr. 15, 1993.
Baylon and Lim, Transform/Subband Analysis and Synthesis of Signals, pp. 540-544 2ssPA90, Gold Coast, Australia, Aug. 27-31 (1990).
Davidson, Fielder, and Antill, "High Quality Audio Transform Coding at 128 Kbits/s" ICASSP pp. 1117-1120 Apr. 3-6 Albuquerque, N.M. (1990).
Lim, J. S., Two-Dimensional Signal and Image Processing, Prentice Hall Englewood Cliffs, N.J., 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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