Electrical audio signal processing systems and devices – Sound effects
Patent
1996-04-30
1998-12-08
Kuntz, Curtis
Electrical audio signal processing systems and devices
Sound effects
84626, 704278, H03G 300
Patent
active
058481648
ABSTRACT:
An audio effects processing system and method performs audio effects processing on a subband-by-subband basis using less memory and computational resources than audio effects produced through post processing of a fullband audio signal. The input fullband audio signal is split into subbands and the compressed subbands may be stored in memory of the system as compressed audio subband data or may be generated by real time processing of a fullband audio signal. The system stores in memory a set of prototype subband effects filters, the set including echo, flange, chorus, and reverberation effects filters. A subband filter customization procedure allows a sound system designer to build customized versions of the prototype subband effects filters. One or more of the customized subband effects filters are applied to one or more of the subbands comprising the compressed audio subband data. The compressed audio subband data is then processed through a synthesis filter bank which decompresses and decodes the compressed audio subband data to produce a decompressed decoded audio output signal with the audio effects incorporated in it. The system uses less memory and computational resources by applying the customized subband effects filters to less than a full set of subbands comprising the compressed audio subband data without suffering any psychoacoustical loss. Each subband is processed separately and independent of the other subbands. By computing effects separately for each subband, different effects can be performed on different frequency regions. This allows different effects to be placed on the subbands, providing the ability to create a multiband audio effects processor.
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N.J. Fliege, et al.; "Multi-Complementary Filter Bank"; Hamburg University of Technology, Germany.
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M. Alexander Broadhead, et al.; "Direct Manipulation of MPEG Compressed Digital Audio"; Dartmouth College, Hanover, New Hampshire.
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PCT Search Report; US97/06496; Aug. 5, 1997.
Kuntz Curtis
Lee Ping W.
The Board of Trustees of the Leland Stanford Junior University
Williams Gary S.
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