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An Adapting Delay Comb Filter for the Restoration of Audio Signals Badly Corrupted with a Periodic Signal of Slowly Changing Frequency

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The adapting delay comb filter is a device for acquiring, nulling, and tracking on unwanted periodic interfering signal that is corrupting a desired program signal. A feedback structure is used to make a standard comb filter self-adjusting so that it will attempt to null out a strong periodic signal, passing the desired signal by default.

JAES Volume 30 Issue 1/2 pp. 24-27; February 1982
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AES - Audio Engineering Society