Brian M Mccarthy

US Patent:

6385577, May 7, 2002

Filed:

Mar 14, 2001

Appl. No.:

09/805634

Inventors:

Daniel Lin - Montville NJ
Brian M. McCarthy - Lafayette Hill PA

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

G10L 1900

US Classification:

704223, 704201, 704219

Abstract:

A version of a speech signal and an output of a pitch synthesis filter and a linear predictive all-pole (LPC) filter is received. A system impulse response is produced based on in part the received pitch synthesis filter and LPC output. An excitation pulse location is determined so that the determined location minimizes an error between the speech signal version and the system impulse response. The speech signal is encoded with a representation of the determined location.

US Patent:

6611799, Aug 26, 2003

Filed:

Feb 26, 2002

Appl. No.:

10/083237

Inventors:

Daniel Lin - Montville NJ
Brian M. McCarthy - Lafayette Hill PA

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

G10L 1910

US Classification:

704219

Abstract:

Linear predictive coding (LPC) filter parameters are determined for use in encoding a voice signal. Samples of a speech signal using a z-transform function are pre-emphasized. The pre-emphasized samples are analyzed to produce LPC reflection coefficients. The LPC reflection coefficients are quantized by a voiced quantizer and by an unvoiced quantizer producing sets of quantized reflection coefficients. Each set is converted into respective spectral coefficients. The set which produces a smaller lag-spectral distance is determined. The determined set is selected to encode the voice signal.

US Patent:

6782359, Aug 24, 2004

Filed:

May 28, 2003

Appl. No.:

10/446314

Inventors:

Daniel Lin - Montville NJ
Brian M. McCarthy - Lafayette Hill PA

Assignee:

InterDigital Technology Corporation - Wilmington DE

International Classification:

G10L 1904

US Classification:

704219, 704220, 704222

Abstract:

Linear predictive coding (LPC) filter parameters are determined for use in encoding a voice signal. Samples of a speech signal using a z-transform function are pre-emphasized. The pre-emphasized samples are analyzed to produce LPC reflection coefficients. The LPC reflection coefficients are quantized by a voiced quantizer and by an unvoiced quantizer producing sets of quantized reflection coefficients. Each set is converted into respective spectral coefficients. The set which produces a smaller lag-spectral distance is determined. The determined set is selected to encode the voice signal.

US Patent:

20030012358, Jan 16, 2003

Filed:

Apr 25, 2001

Appl. No.:

09/841938

Inventors:

Scott Kurtz - Burlington NJ, US
Brian McCarthy - Montgomery PA, US

International Classification:

H04M001/00
H04M003/00

US Classification:

379/346000, 379/406130

Abstract:

A DFT is used to compute the magnitude and phase of the frequencies desired to be detected in a frame of sampled data by performing 2 dot products for each such frequency. The two dot products are calculated using the samples in the frame and an equal number of equally spaced cosine and sine coefficients for each frequency to be detected.

US Patent:

20030016815, Jan 23, 2003

Filed:

Mar 13, 2001

Appl. No.:

09/805351

Inventors:

Scott Kurtz - Burlington NJ, US
Brian McCarthy - Lafayette Hill PA, US

International Classification:

H04M009/08

US Classification:

379/406010

Abstract:

A method of echo cancellation for a signal transmission system in which the size of the step used to adapt filter coefficients is adjusted in accordance with the echo delay and in which stationary signals are avoided by determining when the mean and variance of coefficients obtained from a second order linear predictive coding analysis of successive far end samples exceed preset thresholds.

US Patent:

20100023326, Jan 28, 2010

Filed:

Oct 5, 2009

Appl. No.:

12/573584

Inventors:

Daniel Lin - Montville NJ, US
Brian M. McCarthy - Lafayette Hill PA, US

Assignee:

INTERDIGITAL TECHNOLOGY CORPORATION - Wilmington DE

International Classification:

G10L 19/00

US Classification:

704219, 704E19024, 704220

Abstract:

The present invention is a synthetic speech encoding device that produces a synthetic speech signal which closely matches an actual speech signal. The actual speech signal is digitized, and excitation pulses are selected by minimizing the error between the actual and synthetic speech signals. The preferred pattern of excitation pulses needed to produce the synthetic speech signal is obtained by using an excitation pattern containing a multiplicity of weighted pulses at timed positions. The selection of the location and amplitude of each excitation pulse is obtained by minimizing an error criterion between the synthetic speech signal and the actual speech signal. The error criterion function incorporates a perceptual weighting filter which shapes the error spectrum.

US Patent:

50723081, Dec 10, 1991

Filed:

Nov 26, 1990

Appl. No.:

7/617789

Inventors:

Daniel Lin - Montville NJ
Scott D. Kurtz - Mount Laurel NJ
Brian M. McCarthy - Lafayette Hill PA
James M. Kresse - Marlton NJ

Assignee:

International Mobile Machines Corporation - King of Prussia PA

International Classification:

H04N 141

US Classification:

358426

Abstract:

A telecommunication system and method for communicating communication signals between various stations over a selected carrier medium. An improved encoder and method is provided for compressing a communication signal into a selectively formatted encoded signal to facilitate its transmission over the selected carrier medium. The method is particularly useful for encoding fax and modem data signals which do not exhibit the harmonics of a voice signal. A decoder and method for reconstruction of the encoded signal are also provided.

US Patent:

56300166, May 13, 1997

Filed:

Mar 7, 1996

Appl. No.:

8/614777

Inventors:

Kumar Swaminathan - Gaithersburg MD
Brian M. McCarthy - Lafayette Hill PA

Assignee:

Hughes Electronics - Los Angeles CA

International Classification:

G10L 900

US Classification:

395 237

Abstract:

A digital discontinuous cellular communication system has a transmitter that transmits two frames of data following detection of voice inactivity. A receiver includes a comfort noise generator that uses the two frames of data to output noise to the speaker during period of voice inactivity. The comfort noise generator includes synthesis codebook with samples scaled by actual background noise and excitation codebook with samples filtered and scaled by the background noise that are combined to produce comfort noise having attributes and loudness level of the received background noise prior to interruption of transmission. The scaled signals are weighted to vary the loudness level and spectral attributes.