Electrical audio signal processing systems and devices – Including frequency control – Automatic tone control
Reexamination Certificate
2011-08-02
2011-08-02
Mei, Xu (Department: 2614)
Electrical audio signal processing systems and devices
Including frequency control
Automatic tone control
C381S098000
Reexamination Certificate
active
07991171
ABSTRACT:
A method and apparatus for processing an audio signal in multiple audio frequency bands while minimizing undesirable changes in tonal qualities of the audio signal by determining an initial gain adjustment factor for each audio frequency band resulting from the application of an audio processing technique. A final gain adjustment factor for each band is selected from a corresponding set of weighted or unweighted initial gain adjustment factors. The set of initial gain adjustment factors from which the final gain adjustment factor for a specified audio frequency band is obtained is derived from other audio frequency bands that have the frequency of the specified band as a harmonic frequency. Changes in audio signal level within one audio frequency band thereby affect the signal level of harmonic frequencies to decrease relative changes in volume between a fundamental frequency and its harmonics.
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DeLio & Peterson LLC
Lao Lun
Mei Xu
Nowak Kelly M.
Wheatstone Corporation
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