Data processing: speech signal processing – linguistics – language – Audio signal bandwidth compression or expansion
Patent
1997-03-27
1999-01-26
Dorvil, Richemond
Data processing: speech signal processing, linguistics, language
Audio signal bandwidth compression or expansion
704229, G10L 900
Patent
active
058648160
ABSTRACT:
Techniques for applying attenuation to audio signal frames in MPEG and similar compression systems are described, together with a method for mixing such signals without decompression. Each entry in a data frame (F) has an associated scale-factor index (SF), identifying a respective entry in a sequentially arranged and spaced table of scale-factor values. The attenuation technique (20), which suitably precedes mixing for at least one channel involves simple addition to scale factor index values to refer to a different scale-factor value. Respective sub-band data groups from each channel are compared in terms of their respective scale factors and following scaling the data for the two groups is added together. The scale-factor table spacing, which suitable corresponds to a 1 dB attenuation, is used for quick scaling of the results of the addition if overflow is determined to have occurred.
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Biren Steven R.
Dorvil Richemond
U.S. Philips Corporation
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