Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Adjacent ear
Patent
1997-04-30
2000-05-30
Lee, Ping
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Adjacent ear
330262, 381120, A61F 1106
Patent
active
060699590
ABSTRACT:
An active headset providing for reduction of external noise over a given frequency range by means of a microphone which generates an external noise representative signal processed and fed to a loudspeaker to produce an external noise cancellation signal spectrum, wherein a bridge amplifier circuit is interposed between the microphone and the loudspeaker and the gain of the bridge amplifier for peak amplitude of the noise cancellation signal is user adjustable without substantially reducing the breadth of the given frequency range over which noise reduction is effective.
REFERENCES:
patent: 4455675 (1984-06-01), Bose et al.
patent: 4953217 (1990-08-01), Twiney et al.
patent: 5732143 (1998-03-01), Andrea et al.
patent: 5774565 (1998-06-01), Bennings et al.
Larson Renee Michelle
Lee Ping
Noise Cancellation Technologies, Inc.
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