Brian W Ellison

US Patent:

7333618, Feb 19, 2008

Filed:

Sep 24, 2003

Appl. No.:

10/669290

Inventors:

Timothy J. Shuttleworth - Woodland Hills CA,
Richard A. Kreifeldt - Sandy UT,
C. Rex Reed - Salt Lake City UT,
Brian R. Ellison - Salt Lake City UT,

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

H03G 3/20

US Classification:

381 57

Abstract:

Systems and methods for ambient noise compensation are disclosed. One example of 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.

US Patent:

8005231, Aug 23, 2011

Filed:

Nov 21, 2007

Appl. No.:

11/944016

Inventors:

Timothy J. Shuttleworth - Woodland Hills CA,
Richard A. Kreifeldt - Sandy UT,
C. Rex Reed - Salt Lake City UT,
Brian R. Ellison - Salt Lake City UT,

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

H03G 3/20

US Classification:

381 57

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.

US Patent:

8577048, Nov 5, 2013

Filed:

Sep 2, 2006

Appl. No.:

12/065479

Inventors:

Peter Chaikin - Santa Monica CA,
Geoffrey Christopherson - Encino CA,
Brian Ellison - Salt Lake City UT,
John Lee - Salt Lake City UT,
Miguel Paganini - West Hills CA,
C. Rex Reed - Salt Lake City UT,
Timothy Shuttleworth - Oceanside CA,
Gregory Wright - Prior Lake MN,

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

H04R 29/00

US Classification:

381 59, 381 58, 381103

Abstract:

Systems and methods for calibrating a loudspeaker with a connection to a microphone located at a listening area in a room. The loudspeaker includes self-calibration functions to adjust speaker characteristics according to effects generated by operating the loudspeaker in the room. In one example, the microphone picks up a test signal generated by the loudspeaker and the loudspeaker uses the test signal to determine the loudspeaker frequency response. The frequency response is analyzed below a selected low frequency value for a room mode. The loudspeaker generates parameters for a digital filter to compensate for the room modes. In another example, the loudspeaker may be networked with other speakers to perform calibration functions on all of the loudspeakers in the network.

US Patent:

2007022, Sep 27, 2007

Filed:

Jun 4, 2007

Appl. No.:

11/757798

Inventors:

Timothy Shuttleworth - Woodland Hills CA,
Richard Kreifeldt - Sandy UT,
C. Reed - Salt Lake City UT,
Brian Ellison - Salt Lake City UT,

Assignee:

Harman International Industries, Incorporated - Northridge CA

International Classification:

H04B 15/00

US Classification:

381094100

Abstract:

An ambient noise compensation system determines an ambient noise level of a listening area. The ambient noise level may be calculated from the differences between a desired audio signal in the listening area, a measured background noise level in the listening area, and measured acoustic characteristics of the listening area. Based on the ambient noise level, the system adjusts a level of the desired audio signal so that it is audible over undesirable noise.