Patent
1993-08-31
1996-12-03
MacDonald, Allen R.
395 233, 395 239, 395 234, 395 215, G10L 302, G10L 900
Patent
active
055816533
ABSTRACT:
A split-band encoder prepares an estimate of an input signal spectral envelope by splitting the input signal into frequency subband signals, generates a scaled representation of the subband signals comprising scaling factors and scaled values, generates a differential coded representation of the scaling factors, and assembles the differential coded representation and scaled values into an encoded signal. The scale factors represent a spectral envelope of the input signal and spectral leakage between filterbank subbands limits the change in value between adjacent scaling factors. This limitation in change can be exploited to reduce the informational requirements of the differential coded representation. Adaptive selection between high- and low-resolution spectral envelopes and adaptive scaling factor reuse are described.
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Rabiner and Schafer, "Digital Processing of Speech Signals", 1978, pp. 282-290.
Presentation material of proposed MIT Audio Coder, MIT Advanced Television and Signal Processing Group, received Feb. 15, 1993.
Chowdhury Indranil
Dolby Laboratories Licensing Corporation
Gallagher Thomas A.
Lathrop David N.
MacDonald Allen R.
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