Ambient noise sound level compensation

Details Ambient noise sound level compensation Ambient noise sound level compensation

2011-08-23

2011-08-23

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

Monitoring of sound

Amplification control responsive to ambient sound

Reexamination Certificate

active

08005231

ABSTRACT:
A system includes a variable amplifier, a source sound processor, an area sound processor, and an adjustment circuit. The variable amplifier adjusts an audio input signal to generate an audio output signal with an appropriate level so that the audio output signal is audible over noise in a listening area. The source sound processor and the area sound processor may split the audio output signal and a monitoring signal into frequency bands, and may compare these signals band-by-band to find differences that represent time-varying noise in the monitoring signal. These differences may be modified to account for the acoustic response of the listening area and for constant-level background noise in the listening area. The adjustment circuit controls the variable amplifier in response to these differences.

REFERENCES:
patent: 4479237 (1984-10-01), Sugasawa
patent: 4641344 (1987-02-01), Kasai et al.
patent: 4845758 (1989-07-01), Op de Beek et al.
patent: 4944018 (1990-07-01), Bose et al.
patent: 5208866 (1993-05-01), Kato et al.
patent: 5872852 (1999-02-01), Dougherty
patent: 5907622 (1999-05-01), Dougherty
patent: 6606391 (2003-08-01), Brennan et al.
patent: 6805633 (2004-10-01), Hein et al.
patent: 7054448 (2006-05-01), Yoshino et al.
patent: 7171010 (2007-01-01), Martin et al.
patent: 7333618 (2008-02-01), Shuttleworth et al.
Brochure for Lyntec CrowdComp, http://www.lyntec.com/body—c3.htm, downloaded Jun. 25, 2003 ( 2 pages).
The LynTec CrowdComp™ always knows when to speak UP, http://www.lyntec.com/139-0146-01—C3—Broch.pdf, downloaded Jun. 25, 2003 (4 pages).
Symetrix 371 SPL Computer, http://www.symetrixaudio.com/Products/371.htm, downloaded Jun. 25, 2003 (2 pages).
Datasheet for Symetrix 371 SPL Computer, 2001, “371data.pdf,” downloaded from http://www.symetrixaudio.com/ on Jun. 25, 2003 (2 pages).
Circuit drawing for Symetrix 371 SPL Computer, Oct. 30, 2000, “371flow.pdf,” downloaded from http://www.symetrixaudio.com/ on Jun. 25, 2003 (pp. 1).
SPL Computer User's Guide Rev B.02, Jun. 2001, “371ug—0b02.pdf,” downloaded from http://www.symetrixaudio.com on Jun. 25, 2003 (27 pages).
Biamp Systems Signal Processors, http://www.biamp.com/products/signal/, downloaded Jul. 29, 2003 (5 pages).
ANC22 Ambient Noise Compensator Operation Manual, Nov. 2, 1998, “ancmnl.pdf,” downloaded from http://www.biamp.com (14 pages).
Brochure for Biamp ANC22 Ambient Noise Compensator, http://www.biamp.com/products/pdf/ANC22brc.pdf, downloaded Jun. 25, 2003 (2 pages).
Jubien, Chris, et al.,Noise Sensing Using a Variation of the nLMS Adaptive Filter with Auto Calibration, Mackie Industrial White Paper, Sep. 2000, downloaded from http://www.mackie.com/products/pdf/spdsp-1—wp.pdf on Jun. 25, 2003 (12 pages).

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