Pulse or digital communications – Bandwidth reduction or expansion – Pulse code modulation
Patent
1993-12-30
1998-06-09
Coles, Sr., Edward L.
Pulse or digital communications
Bandwidth reduction or expansion
Pulse code modulation
370118, 341 51, 381 29, 381 30, H03M 734, H04J 1500, H04B 166, G01L 302
Patent
active
057646988
ABSTRACT:
A method and system for efficiently compressing a digital audio signal, wherein the digital audio signal includes a plurality of samples. Each of the samples are separated into a plurality of subbands. A signal to mask ratio (SMR) for each the subbands is predicted utilizing a model of relationships between energy values within each of the subbands and SMR values based on a predetermined psychoacoustic model. A number of are allocated bits in response to the predicted SMR and a preselected bit-rate. Then, each of the subbands are quantized based on the number of bits allocated, wherein the digital audio signal may be efficiently compressed.
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Sudharsanan Subramania
Suthakaran Selvarathinam
Coles Sr. Edward L.
Dillon Andrew J.
International Business Machines - Corporation
Williams Kimberly A.
Yee Duke W.
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