Method and apparatus for encoding and decoding multiple audio ch

Details Method and apparatus for encoding and decoding multiple audio ch Method and apparatus for encoding and decoding multiple audio ch

1997-07-16

1999-03-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

With content reduction encoding

704500, 381 1, G01L 500

Patent

active

058901256

ABSTRACT:
A split-band coding system combines multiple channels of input signals into various forms of composite signals and generates spatial-characteristic signals representing soundfield spatial characteristics in a plurality of frequency subbands. The spatial-characteristics signals may be generated in either or both of two forms. In a first form, the signal represents measures of signal levels for subband signals from the input channels. In a second form, the signal represents one or more apparent directions for the soundfield. The type of the spatial-characteristics signal may be adapted dynamically in response to a variety of criteria including input signal characteristics. Temporal smoothing and spectral smoothing of the spatial-characteristics signals may be applied in an encoder. Temporal smoothing and spectral smoothing may be applied to gain factors derived from the spatial-characteristics signals in a decoder.

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Brandenburg et al. ISO-MPEG Audio: A Generic Standard for Coding of High Quality Digital Audio pp. 780-792, Jul. 15, 1994.

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