Wei Xiong Ma

US Patent:

6490552, Dec 3, 2002

Filed:

Oct 6, 1999

Appl. No.:

09/413579

Inventors:

K. Y. Martin Lee - San Francisco CA
Wei Ma - Castro Valley CA

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

G10L 1906

US Classification:

704209, 704228

Abstract:

Perceptual quality of a processed signal obtained by processing an original signal having silent periods is evaluated. Silent portions and speech portions of the original signal and corresponding silent portions and speech portions of the processed signal are identified, and the silent portions of the processed signal are evaluated in accordance with a function of amounts of energy contained in the silent portions of the processed signal, corresponding silent portions of the original signal, and an amount of energy in speech portions of the original signal. In one embodiment, the original signal and the processed signal are segmented into frames, frames of the original signal that represent speech and frames of the original signal that represent silence are identified, and the evaluation produces a mean opinion score (MOS).

US Patent:

6819924, Nov 16, 2004

Filed:

Jan 24, 2001

Appl. No.:

09/744521

Inventors:

Wei Ma - Castro Valley CA
Martin Lee - Hayward CA
Kambiz Homayounfar - Tokyo, JP

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

H04Q 734

US Classification:

455425, 455 6714, 370241, 370249

Abstract:

A method for measuring perceptual quality of voice signals, audio signals, audio-video signals, and multimedia signals in communication equipment in an operational embodiment communicates a processed test signal via a network from a first device to a second device. The processed test signal is then received by an equipment under test, which further processes the processed test signal to recover a representation of the test signal. The recovered test signal is then objectively analyzed to determine a measure of perceptual quality by comparing the recovered test signal to a pre-stored representation of the test signal. A quality measurement unit that conveniently attaches to equipment under test identifies and evaluates quality of recovered test signals communicated from a remote device, or a test signal communicated by the equipment under test. In the latter case, the quality measurement unit communicates with both the equipment under test and with the network, so that the quality measurement unit itself receives a representation of the communicated test signal by the equipment under test.

US Patent:

6823302, Nov 23, 2004

Filed:

Jan 24, 2001

Appl. No.:

09/744423

Inventors:

Ian Atkinson - Union City CA
Martin Lee - Hayward CA
Wei Ma - Castro Valley CA
Kambiz Homayounfar - Tokyo, JP

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

G10L 2100

US Classification:

704216, 7042001, 379 102, 379 2703

Abstract:

A method for providing real-time perceptual quality measurements of an audio signal ( ) in which a quality test signal, including an audio test signal, is received by equipment under test. Playback of a pre-stored representation of the audio signal is coarsely synchronized ( ) to the received audio test signal, for example, utilizing a synchronizing pulse in a header of the quality test signal. The playback is then finely synchronized ( ) to the received audio signal, for example, by comparing data in a windowed portion of the received audio test signal and a windowed portion of the pre-stored representation of the audio test signal and by adjusting a windowed portion of the pre-stored representation of the audio test signal in accordance with results of the comparison. A window of the received audio test singal is then compared ( ) to a portion of the finely synchronized play back of the pre-stored representation of the audio test signal to output a quality measurement of the received audio test signal.

US Patent:

7062769, Jun 13, 2006

Filed:

Jul 7, 1999

Appl. No.:

09/348783

Inventors:

Wei Ma - Castro Valley CA, US
K. Y. Martin Lee - San Francisco CA, US
Kambiz Homayounfar - Tokyo, JP

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

G06F 3/00
G06F 9/44
G06F 9/46
G06F 13/00

US Classification:

719312, 716 7

Abstract:

A distributed processing system having a host processor including a host communication infrastructure (HCI) configured for communication with said host processor; a plurality of class processors each having an associated private localized read/write memory; and a plurality of application program interface modules each configured to provide an interface between said host communication infrastructure and at least one said class processor, wherein each said class processor responds to selected data messages on said HCI to perform selected computations utilizing said read/write memory. This embodiment provides an ideal architecture for fabrication on a single chip and avoids processor and bus bottlenecks by providing distributed processing power with local memory for each class processor. Also provided is a method for designing a distributed processing system for an application. The method includes steps of partitioning the application into functions and data messages; configuring a host processor having a host communication infrastructure (HCI) to pass data messages via the HCI to control the application; configuring a plurality of class processors to compute the functions into which the application is partitioned in response to the data messages; and interconnecting the class processors to the host processor via application program interface modules in a star configuration.

US Patent:

7460024, Dec 2, 2008

Filed:

Jan 17, 2006

Appl. No.:

11/306949

Inventors:

Wei Ma - San Ramon CA, US
Ahmad Bahai - Lafayette CA, US

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

G08B 23/00

US Classification:

3406933, 7386118

Abstract:

Active sensor circuitry for operating at low power and a low duty cycle while monitoring for an occurrence of an anticipated event.

US Patent:

7676052, Mar 9, 2010

Filed:

Feb 28, 2006

Appl. No.:

11/307932

Inventors:

Wei Ma - San Ramon CA, US
Ahmad Bahai - Lafayette CA, US

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

H04R 25/00

US Classification:

381356, 381 92, 381357, 381369

Abstract:

A differential microphone assembly with multiple membranes in a single package and oriented in mutually exclusive directions.

US Patent:

7864969, Jan 4, 2011

Filed:

Feb 28, 2006

Appl. No.:

11/307930

Inventors:

Wei Ma - San Ramon CA, US
Ahmad Bahai - Lafayette CA, US

Assignee:

National Semiconductor Corporation - Santa Clara CA

International Classification:

H04R 3/00

US Classification:

381 92, 381 7111

Abstract:

Adaptive amplifier circuitry for a microphone array with alternative operating modes. In one mode, background noise is reduced when the speaker is in a near field position and a relatively quiet environment. In another mode, the microphone signals are amplified, with speech being boosted more than background noise, when the speaker moves from a near field position to a far field position.

US Patent:

8171333, May 1, 2012

Filed:

Jul 15, 2009

Appl. No.:

12/503438

Inventors:

Wei Ma - San Ramon CA, US
Zhenyong Zhang - Sunnyvale CA, US
Jian-yi Wu - San Ramon CA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G06F 1/00
G03B 42/06

US Classification:

713500, 713600, 367137

Abstract:

Multi-channel pulser driver circuitry for a sub-beam forming transmitter of an ultrasound system in which sub-beam signals are formed by delaying sub-beam pulse pattern data in accordance with sub-beam pulse delay data and multiple clock signals.