Method for reduction of aliasing introduced by spectral...

Details Method for reduction of aliasing introduced by spectral... Method for reduction of aliasing introduced by spectral...

2007-09-26

2009-06-16

Hudspeth, David R. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

C381S094300

Reexamination Certificate

active

07548864

ABSTRACT:
The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

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N. Gilchrist, et al. “Collected Papers on Digital Audio Bit-Rate Reduction”. Audio-Engineering Society. No. 3. 1996.

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