A system and method are disclosed to cancel noise other than speech in a TV. The method uses technology used in noise cancelling headphones to cancel noise delivered with dialogue through the TV's audio output. The system includes electronics, placed between the TV’s audio signal and the speakers, to sense the audio content and generate a "fingerprint" of the noise, noting the frequency and amplitude of the incoming wave. The system then creates a new wave that is 180 degrees out of phase with the waves associated with the noise, to cancel the noise out. The cancelling feature may be used for content rendered (decoded) by the TV itself or audio input to the TV from HDMI, analog audio in, etc. The system may apply the filtering function very selectively to automatically highlight voice frequencies.
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Candelore, Brant; Nejat, Mike; and Shintani, Peter, "Noise Cancellation For Tv Output", Technical Disclosure Commons, (May 01, 2017)