Audio feedback processing system

Details Audio feedback processing system Audio feedback processing system

2007-04-10

2007-04-10

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Feedback suppression

C381S083000, C381S096000

Reexamination Certificate

active

10387915

ABSTRACT:
This invention is an audio system capable of identifying frequencies of feedback signals and filters these feedback signals. Frequency interpolation is utilized on a sampled frequency spectrum signal corresponding to a feedback signal, where the frequency interpolation allows the frequency of the feedback signal to be identified, especially where the frequency lies between samples of the frequency spectrum signal. The frequency identification allows a less intrusive filter, such as a notch filter, to be placed at the determined frequency of the feedback to eliminate the feedback signal. The placement of the notch filter reduces the effect on the audio signal provided by the audio system. The audio system may provide adaptive filtering of multiple feedback signals, using a single filter such as a notch filter. The single notch filter is configured to filter the more than one feedback signal, thereby freeing-up notch filters for filtering other feedback signals, or for reducing memory and processing requirements for the processor of the system.

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