Martin C Walsh

US Patent:

6714652, Mar 30, 2004

Filed:

Oct 3, 2000

Appl. No.:

09/679126

Inventors:

Stephen A. Davis - Santa Clara CA
Martin Walsh - Palo Alto CA
David Berners - Mountain View CA

Assignee:

Creative Technology, Ltd. - Singapore

International Classification:

H04R 500

US Classification:

381 17, 381 18, 381310, 381 1

Abstract:

A system and method are described for rendering a left rear surround input signal at a left rear virtual speaker location and rendering a right rear surround input signal at a right rear virtual speaker location. The method includes phase shifting the left rear surround input signal by a first phase shift. The right rear surround input signal is phase shifted by a second phase shift. The phase shifted left rear surround input signal is phase shifted using an HRTF selected to render the left rear surround input signal at the left rear virtual speaker location. The phase shifted right rear surround input signal is transformed using an HRTF selected to render the right rear surround input signal at the right rear virtual speaker location.

US Patent:

6837219, Jan 4, 2005

Filed:

Feb 4, 2003

Appl. No.:

10/357668

Inventors:

George York - Belleville IL, US
Paul Meyer - Alton IL, US
Martin Walsh - Fenton MI, US

Assignee:

Airtex Products - Fairfield IL

International Classification:

F02M 100

US Classification:

123457, 123511

Abstract:

A ported pressure relief valve () used in an automotive fuel system (F) includes an unrestricted constant bleed orifice () for routing pressurized fuel from a fuel pump (P) back to a fuel source (T, M) when an engine (E) is running. A check valve () prevents flow from a fuel system back to the fuel source when the engine is off, so to retain sufficient pressure in the delivery system that the engine will readily start when cranked. A pressure relief valve () drains fuel from the delivery system back to the source of fuel in response to a pressure build up in the fuel delivery system above a predetermined pressure level so to prevent an overpressure condition which would otherwise damage the fuel delivery system.

US Patent:

6839438, Jan 4, 2005

Filed:

Aug 2, 2000

Appl. No.:

09/630439

Inventors:

Edward Riegelsberger - Fremont CA, US
Martin Walsh - Palo Alto CA, US

Assignee:

Creative Technology, Ltd - Singapore

International Classification:

H04R 500

US Classification:

381 18, 381303

Abstract:

An audio rendering system and method are disclosed. The audio rendering system generally comprises front and rear signal modifiers configured to receive a plurality of audio signals representing a plurality of sources of aural information and location information representing apparent location for the source of said aural information. A gain is applied to the signals representative of the location information. A front signal modifier includes a plurality of head-related transfer functions filters and a rear signal modifier includes a plurality of filters configured to approximate head-related transfer function filters. The system further includes front speakers comprising a left front speaker and right front speaker configured to receive signals from the front signal modifier and generate a signal to a listener. At least one rear speaker is configured to receive signals from the rear signal modifier and generate a signal to the listener to offset frontward bias created by the front speakers. The gains applied to the signal are calculated to produce generally equal perceived energy from each of the front and rear speakers.

US Patent:

7177431, Feb 13, 2007

Filed:

May 23, 2006

Appl. No.:

11/439931

Inventors:

Stephen A. Davis - Santa Clara CA, US
Martin Walsh - Palo Alto CA, US
David Berners - Mountain View CA, US

Assignee:

Creative Technology, Ltd. - Singapore

International Classification:

H04R 5/00
H04R 1/40

US Classification:

381 1, 381 17, 381307, 381 97

Abstract:

A system and method are described for rendering a left rear surround input signal at a left rear virtual speaker location and rendering a right rear surround input signal at a right rear virtual speaker location. The method includes phase shifting the left rear surround input signal by a first phase shift. The right rear surround input signal is phase shifted by a second phase shift. The phase shifted left rear surround input signal is phase shifted using an HRTF selected to render the left rear surround input signal at the left rear virtual speaker location. The phase shifted right rear surround input signal is transformed using an HRTF selected to render the right rear surround input signal at the right rear virtual speaker location.

US Patent:

7555354, Jun 30, 2009

Filed:

Oct 20, 2006

Appl. No.:

11/584125

Inventors:

Martin Walsh - Scotts Valley CA, US
Mark Dolson - Ben Lomond CA, US

Assignee:

Creative Technology Ltd - Singapore

International Classification:

G06F 17/00
H04B 1/00
H04B 1/20

US Classification:

700 94, 381119, 369 4

Abstract:

A method and device are described to process an event on an audio rendering device. The method may comprise rendering a first audio stream via at least a first audio signal in a first audio playback channel and a second audio signal in a second audio playback channel and monitoring occurrence of the event with an associated second audio stream. Upon occurrence of the event, the first audio signal may be panned to the second audio playback channel, the first audio signal being mixed with the second audio signal in the second audio playback channel. The second audio stream is then rendered via the first audio playback channel.

US Patent:

8000485, Aug 16, 2011

Filed:

Apr 19, 2010

Appl. No.:

12/762915

Inventors:

Martin Walsh - Scotts Valley CA, US
William Paul Smith - Bangor, GB
Jean-Marc Jot - Aptos CA, US

Assignee:

DTS, Inc. - Calabasas CA

International Classification:

H04R 5/02
H04R 5/00

US Classification:

381309, 381 27

Abstract:

There are provided methods and an apparatus for processing audio signals. According to one aspect of the present invention there is included a method for processing audio signals having the steps of receiving at least one audio signal having at least a center channel signal, a right side channel signal, and a left side channel signal; processing the right and left side channel signals with a first virtualizer processor, thereby creating a right virtualized channel signal and a left virtualized channel signal; processing the center channel signal with a spatial extensor to produce distinct right and left outputs, thereby expanding the center channel with a pseudo-stereo effect; and summing the right and left outputs with the right and left virtualized channel signals to produce at least one modified side channel output.

US Patent:

8488796, Jul 16, 2013

Filed:

Aug 8, 2007

Appl. No.:

11/836137

Inventors:

Jean-Marc Jot - Aptos CA, US
Martin Walsh - Scotts Valley CA, US
Adam R. Philp - Twickenham, GB

Assignee:

Creative Technology Ltd - Singapore

International Classification:

H04R 5/00

US Classification:

381 17, 381310, 381309, 381 18, 381 22, 381 23, 381 28, 700 94

Abstract:

A method for simulating spatially extended sound sources comprising: panning a first input signal over a plurality of output channels to generate a first multi-channel directionally encoded signal; panning a second input signal over the plurality of output channels to generate a second multi-channel directionally encoded signal; combining the first and second multi-channel directionally encoded signals to generate a plurality of loudspeaker output channels; and applying a bank of decorrelation filters on the loudspeaker output channels.

US Patent:

8619998, Dec 31, 2013

Filed:

Aug 7, 2007

Appl. No.:

11/835403

Inventors:

Martin Walsh - Scotts Valley CA, US
Jean Marc Jot - Aptos CA, US
Edward Stein - Capitola CA, US

Assignee:

Creative Technology Ltd - Singapore

International Classification:

H04S 1/00

US Classification:

381 17, 381310, 381 18, 381 19, 381102, 381103, 381104, 381300, 381309, 381 1

Abstract:

The present invention describes techniques that can be used to provide novel methods of spatial audio rendering using adapted M-S matrix shuffler topologies. Such techniques include headphone and loudspeaker-based binaural signal simulation and rendering, stereo expansion, multichannel upmix and pseudo multichannel surround rendering.