Brian J 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:

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:

49740997, Nov 27, 1990

Filed:

Jun 21, 1989

Appl. No.:

7/369292

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:

6006174, Dec 21, 1999

Filed:

Oct 15, 1997

Appl. No.:

8/950658

Inventors:

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

Assignee:

InterDigital Technology Coporation - Wilmington DE

International Classification:

G10L 904

US Classification:

704201

Abstract:

The generation of multipulse excitation codes by digitizing an original speech, partitioning the digitized signal into a number of samples, pre-emphasizing the samples, producing linear predictive reflection coefficients from said samples, quantizing these reflection coefficients, converting the quantized reflection coefficients to spectral coefficients and subjecting the spectral coefficients to pitch analysis to obtain a spectral residual signal.

US Patent:

52356701, Aug 10, 1993

Filed:

Oct 3, 1990

Appl. No.:

7/592330

Inventors:

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

Assignee:

InterDigital Patents Corporation - Philadelphia PA

International Classification:

G10L 904

US Classification:

395 2

Abstract:

The generation of multipulse excitation codes by digitizing an original speech, partitioning the digitized signal into a number of samples, pre-emphasizing the samples, producing linear predictive reflection coefficients from said samples, quantizing these reflection coefficients, converting the quantized reflection coefficients to spectral coefficients and subjecting the spectral coefficients to pitch analysis to obtain a spectral residual signal.