Patents by Inventor Brian M. McCarthy
Brian M. McCarthy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20100023326Abstract: 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.Type: ApplicationFiled: October 5, 2009Publication date: January 28, 2010Applicant: INTERDIGITAL TECHNOLOGY CORPORATIONInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 7599832Abstract: 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.Type: GrantFiled: February 28, 2006Date of Patent: October 6, 2009Assignee: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 7013270Abstract: The present invention is a method for determining linear predictive coding filter parameters for encoding a voice signal. The method includes sampling a voice signal, grouping the samples into a plurality of frames, generating a plurality of reflection coefficients for each frame of samples, quantizing the reflection coefficients, generating spectral coefficients from the quantized reflection coefficients, selecting a quantized reflection coefficient having the smallest log-spectral distance between a quantized spectrum, and an unquantized spectrum and, converting the selected quantized reflection coefficient to linear predictive coding (LPC) filter coefficient.Type: GrantFiled: August 23, 2004Date of Patent: March 14, 2006Assignee: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 6782359Abstract: 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.Type: GrantFiled: May 28, 2003Date of Patent: August 24, 2004Assignee: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Publication number: 20030195744Abstract: 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.Type: ApplicationFiled: May 28, 2003Publication date: October 16, 2003Applicant: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 6611799Abstract: 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.Type: GrantFiled: February 26, 2002Date of Patent: August 26, 2003Assignee: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Publication number: 20020123884Abstract: 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.Type: ApplicationFiled: February 26, 2002Publication date: September 5, 2002Applicant: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 6385577Abstract: 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.Type: GrantFiled: March 14, 2001Date of Patent: May 7, 2002Assignee: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Publication number: 20010016812Abstract: 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.Type: ApplicationFiled: March 14, 2001Publication date: August 23, 2001Inventors: Daniel Lin, Brian M. McCarthy
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Patent number: 6223152Abstract: To perform pitch analysis for encoding a speech signal, a speech signal is sampled. The sampled speech signal is spectrally whitened to produce a spectral residual signal. Samples of the spectral residual signal are collected and the collected samples are autocorrelated. Maximum values of the correlated result are determined. Gain values are determined based on at least in part the maximum values of the correlated result. The gain values are quantized using a codebook to produce a codebook index and an associated frame delay. The codebook index and the frame delay represent a pitch of the speech signal to facilitate encoding the speech signal.Type: GrantFiled: November 16, 1999Date of Patent: April 24, 2001Assignee: InterDigital Technology CorporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 6006174Abstract: 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.Type: GrantFiled: October 15, 1997Date of Patent: December 21, 1999Assignee: InterDigital Technology CoporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 5630016Abstract: 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.Type: GrantFiled: March 7, 1996Date of Patent: May 13, 1997Assignee: Hughes ElectronicsInventors: Kumar Swaminathan, Brian M. McCarthy
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Patent number: 5537509Abstract: 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.Type: GrantFiled: May 28, 1992Date of Patent: July 16, 1996Assignee: Hughes ElectronicsInventors: Kumar Swaminathan, Brian M. McCarthy
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Patent number: 5333191Abstract: A method of operating a digital signal processor to detect DTMF tones in a digital voice telephone system in which the digitally encoded signals appearing on the telephone channel are decimated to compress the spectrum to be monitored for the appearance of call signalling tones. The signals received in a decimated block are "correlated" or convolved with one another on a forward and backward time-shifted basis and each forward and backward correlation product is summed to form the elements of a 5.times.5 modified covariance matrix. The modified covariance matrix exhibits the desirable property that its eigenvectors will be symmetric. Since all eigenvectors of the modified covariance matrix are orthogonal and the eigenvectors associated with the signal span the signal subspace, the signal subspace is orthogonal to the eigenvector associated with the noise. The dot product of the noise eigenvector with the signal subspace is set to zero.Type: GrantFiled: April 22, 1993Date of Patent: July 26, 1994Assignee: InterDigital Technology CorporationInventor: Brian M. McCarthy
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Patent number: 5235670Abstract: 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.Type: GrantFiled: October 3, 1990Date of Patent: August 10, 1993Assignee: InterDigital Patents CorporationInventors: Daniel Lin, Brian M. McCarthy
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Patent number: 5072308Abstract: 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.Type: GrantFiled: November 26, 1990Date of Patent: December 10, 1991Assignee: International Mobile Machines CorporationInventors: Daniel Lin, Scott D. Kurtz, Brian M. McCarthy, James M. Kresse
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Patent number: 4974099Abstract: 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.Type: GrantFiled: June 21, 1989Date of Patent: November 27, 1990Assignee: International Mobile Machines CorporationInventors: Daniel Lin, Scott D. Kurtz, Brian M. McCarthy, James M. Kresse