Patents by Inventor James David Johnston

James David Johnston 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).

  • Publication number: 20210090585
    Abstract: An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events.
    Type: Application
    Filed: December 7, 2020
    Publication date: March 25, 2021
    Applicant: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Publication number: 20210082448
    Abstract: A method for encoding an audio signal, comprising using one or more algorithms operating on a processor to filter the audio signal into two output signals, wherein each output signal has a sampling rate that is equal to a sampling rate of the audio signal, and wherein one of the output signals includes high frequency data. Using one or more algorithms operating on the processor to window the high frequency data by selecting a set of the high frequency data. Using one or more algorithms operating on the processor to determine a set of linear predictive coding (LPC) coefficients for the windowed data. Using one or more algorithms operating on the processor to generate energy scale values for the windowed data. Using one or more algorithms operating on the processor to generate an encoded high frequency bitstream.
    Type: Application
    Filed: September 12, 2019
    Publication date: March 18, 2021
    Applicant: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, King Wei Hor
  • Patent number: 10861474
    Abstract: An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events.
    Type: Grant
    Filed: May 28, 2019
    Date of Patent: December 8, 2020
    Assignee: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Publication number: 20190279653
    Abstract: An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events.
    Type: Application
    Filed: May 28, 2019
    Publication date: September 12, 2019
    Applicant: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Patent number: 10354669
    Abstract: A sub-band coder operable to process audio samples for use in a digital encoder. The sub-band coder comprising application code instructions executable on a processor configured to cause the coder to filter the audio samples into a plurality of frequency band components using at least one Pseudo-Quadrature Mirror Filter (PQMF) and modulate the plurality of frequency band components into a plurality of quantized band values using a pulse code modulation technique. The application code instructions further operable to cause the coder to decode the plurality of quantized band values into an approximation signal using an inverse pulse code modulation technique and at least one Inverse Pseudo-Quadrature Mirror Filter (IPQMF). The application code instructions operable to cause the coder generates an output for use by the digital encoder that includes the plurality of quantized band values, the approximation signal, and a plurality of encoded quantized band values.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: July 16, 2019
    Assignee: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Patent number: 10354668
    Abstract: A codec operable to process audio data and related data. The codec further operable to receive at least one of an audio, audio auxiliary, program configuration, and data signals from a program source, the audio signals including at least one of single channel audio and multi-channel audio signals, audio auxiliary signals including spatial and motion data and environmental characteristics, the data signals including program related data. The codec further operable to generate a non-transitory encoded bitstream, wherein the bitstream includes at least one of synchronization command data and at least one of a program command data, audio channel data, audio auxiliary data, program content data, and an end of stream data, wherein the encoded bitstream includes an identifier for defining packet type for each data component. The synchronization command data includes a stream start flag defining an entry point for decoding the bitstream and further provides sample rate for the encoded bitstream.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: July 16, 2019
    Assignee: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Patent number: 10354667
    Abstract: An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: July 16, 2019
    Assignee: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Patent number: 10339947
    Abstract: A decoder operable to decode audio signals. The decoder operable to receive an encoded bitstream that includes bitstream synchronization command data and program command data and process the encoded bitstream and identify within the bitstream the synchronization command data. The decoder further operable to decode the program command packet and at least one program related channel data using information provided in the synchronization command data and decode program related channel data using information provided in the program command data.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: July 2, 2019
    Assignee: IMMERSION NETWORKS, INC.
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Patent number: 10204631
    Abstract: The MPEG2 Advanced Audio Coder (AAC) standard limits the number of filters used to either one filter for a “short” block or three filters for a “long” block. In cases where the need for additional filters is present but the limit of permissible filters has been reached, the remaining frequency spectra are simply not covered by TNS. Two solutions are proposed to deploy TNS filters in order to get the entire spectrum of the signal into TNS. The first method involves a filter bridging technique and complies with the current AAC standard. The second method involves a filter clustering technique. Although the second method is both more efficient and accurate in capturing the temporal structure of the time signal, it is not AAC standard compliant. Thus, a new syntax for packing filter information derived using the second method for transmission to a receiver is also outlined.
    Type: Grant
    Filed: March 8, 2016
    Date of Patent: February 12, 2019
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: James David Johnston, Shyh-Shiaw Kuo
  • Publication number: 20180278666
    Abstract: A decoder operable to decode audio signals. The decoder operable to receive an encoded bitstream that includes bitstream synchronization command data and program command data and process the encoded bitstream and identify within the bitstream the synchronization command data. The decoder further operable to decode the program command packet and at least one program related channel data using information provided in the synchronization command data and decode program related channel data using information provided in the program command data.
    Type: Application
    Filed: October 17, 2017
    Publication date: September 27, 2018
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Publication number: 20180278241
    Abstract: A sub-band coder operable to process audio samples for use in a digital encoder. The sub-band coder comprising application code instructions executable on a processor configured to cause the coder to filter the audio samples into a plurality of frequency band components using at least one Pseudo-Quadrature Mirror Filter (PQMF) and modulate the plurality of frequency band components into a plurality of quantized band values using a pulse code modulation technique. The application code instructions further operable to cause the coder to decode the plurality of quantized band values into an approximation signal using an inverse pulse code modulation technique and at least one Inverse Pseudo-Quadrature Mirror Filter (IPQMF). The application code instructions operable to cause the coder generates an output for use by the digital encoder that includes the plurality of quantized band values, the approximation signal, and a plurality of encoded quantized band values.
    Type: Application
    Filed: October 17, 2017
    Publication date: September 27, 2018
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Publication number: 20180278962
    Abstract: An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events.
    Type: Application
    Filed: October 17, 2017
    Publication date: September 27, 2018
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Publication number: 20180277130
    Abstract: A codec operable to process audio data and related data. The codec further operable to receive at least one of an audio, audio auxiliary, program configuration, and data signals from a program source, the audio signals including at least one of single channel audio and multi-channel audio signals, audio auxiliary signals including spatial and motion data and environmental characteristics, the data signals including program related data. The codec further operable to generate a non-transitory encoded bitstream, wherein the bitstream includes at least one of synchronization command data and at least one of a program command data, audio channel data, audio auxiliary data, program content data, and an end of stream data, wherein the encoded bitstream includes an identifier for defining packet type for each data component. The synchronization command data includes a stream start flag defining an entry point for decoding the bitstream and further provides sample rate for the encoded bitstream.
    Type: Application
    Filed: October 17, 2017
    Publication date: September 27, 2018
    Inventors: James David Johnston, Stephen Daniel White, King Wei Hor, Barry M. Genova
  • Publication number: 20160189721
    Abstract: The MPEG2 Advanced Audio Coder (AAC) standard limits the number of filters used to either one filter for a “short” block or three filters for a “long” block. In cases where the need for additional filters is present but the limit of permissible filters has been reached, the remaining frequency spectra are simply not covered by TNS. Two solutions are proposed to deploy TNS filters in order to get the entire spectrum of the signal into TNS. The first method involves a filter bridging technique and complies with the current AAC standard. The second method involves a filter clustering technique. Although the second method is both more efficient and accurate in capturing the temporal structure of the time signal, it is not AAC standard compliant. Thus, a new syntax for packing filter information derived using the second method for transmission to a receiver is also outlined.
    Type: Application
    Filed: March 8, 2016
    Publication date: June 30, 2016
    Inventors: JAMES DAVID JOHNSTON, SHYH-SHIAW KUO
  • Patent number: 9305561
    Abstract: The MPEG2 Advanced Audio Coder (AAC) standard limits the number of filters used to either one filter for a “short” block or three filters for a “long” block. In cases where the need for additional filters is present but the limit of permissible filters has been reached, the remaining frequency spectra are simply not covered by TNS. Two solutions are proposed to deploy TNS filters in order to get the entire spectrum of the signal into TNS. The first method involves a filter bridging technique and complies with the current AAC standard. The second method involves a filter clustering technique. Although the second method is both more efficient and accurate in capturing the temporal structure of the time signal, it is not AAC standard compliant. Thus, a new syntax for packing filter information derived using the second method for transmission to a receiver is also outlined.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: April 5, 2016
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: James David Johnston, Shyh-Shiaw Kuo
  • Publication number: 20130261779
    Abstract: The MPEG2 Advanced Audio Coder (AAC) standard limits the number of filters used to either one filter for a “short” block or three filters for a “long” block. In cases where the need for additional filters is present but the limit of permissible filters has been reached, the remaining frequency spectra are simply not covered by TNS. Two solutions are proposed to deploy TNS filters in order to get the entire spectrum of the signal into TNS. The first method involves a filter bridging technique and complies with the current AAC standard. The second method involves a filter clustering technique. Although the second method is both more efficient and accurate in capturing the temporal structure of the time signal, it is not AAC standard compliant. Thus, a new syntax for packing filter information derived using the second method for transmission to a receiver is also outlined.
    Type: Application
    Filed: May 24, 2013
    Publication date: October 3, 2013
    Applicant: AT&T Intellectual Property II, L.P.
    Inventors: James David Johnston, Shyh-Shiaw Kuo
  • Patent number: 8452431
    Abstract: The MPEG2 Advanced Audio Coder (AAC) standard limits the number of filters used to either one filter for a “short” block or three filters for a “long” block. In cases where the need for additional filters is present but the limit of permissible filters has been reached, the remaining frequency spectra are simply not covered by TNS. Two solutions are proposed to deploy TNS filters in order to get the entire spectrum of the signal into TNS. The first method involves a filter bridging technique and complies with the current AAC standard. The second method involves a filter clustering technique. Although the second method is both more efficient and accurate in capturing the temporal structure of the time signal, it is not AAC standard compliant. Thus, a new syntax for packing filter information derived using the second method for transmission to a receiver is also outlined.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: May 28, 2013
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: James David Johnston, Shyh-Shiaw Kuo
  • Patent number: 8095794
    Abstract: A system and method of generating a watermarked signal are disclosed. The system segments the signal into overlapping blocks using a window function and processes the overlapping blocks according to whether each block is odd- or even-numbered. The system windows the odd-numbered blocks, modulates the phase of each block in the frequency domain, transforms each modulated block in the time domain, windows each block transformed into the time domain and overlap-adds each odd-numbered block with each even-numbered block to generate the watermarked signal.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: January 10, 2012
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: James David Johnston, Shyh-Shiaw Kuo, Schuyler Reynier Quackenbush, William Turin
  • Patent number: 7970604
    Abstract: System, method and computer-readable medium are disclosed for using filters signal processing. The system includes a module that receives information regarding a first filter, a module that receives information regarding a second filter, and a module that receives date to indicate switching between the first filter and the second filter across the spectrum of the received audio signal, and a module that processes the received audio signal according to the received data and switching between the first filter and the second filter, wherein at least one of the first filter and the second filter represent a merger of two initial filters.
    Type: Grant
    Filed: March 3, 2009
    Date of Patent: June 28, 2011
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: James David Johnston, Shyh-Shiaw Kuo
  • Patent number: 7882357
    Abstract: A system, method and computer readable medium that processing a watermarked signal using the phase Sk(f) of an original signal. The watermarked signal includes odd and even overlapped blocks where the watermark is contained in the even blocks. The method comprises test-decoding the watermarked signal and, if the watermarked signal contains errors, recoding the watermarked signal with a higher redundancy code. The steps of test-decoding and recording may be performed until all errors are corrected.
    Type: Grant
    Filed: April 4, 2006
    Date of Patent: February 1, 2011
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: James David Johnston, Shyh-Shiaw Kuo, Schuyler Reynier Quackenbush, William Turin