Patents by Inventor Steven Trautmann

Steven Trautmann 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).

  • Patent number: 8213622
    Abstract: This invention is a method for binaural localization using a cascade of resonators and anti-resonators to implement an HRTF (head-related transfer function). The spectrum of the cascade reproduces the magnitude spectrum of a desired HRTF. The proposed method provides a considerably more computationally efficient implementation of HRTF filters with no detectable deterioration of output quality while saving memory when storing a large quantity of HRTFs due to the parameterization of its resonators and anti-resonators. Finally, the method offers additional flexibility since the resonators and anti-resonators can be manipulated individually during the design process, making it possible to interpolate smoothly between HRTFs, reduce spectral coloring or achieve higher accuracy at perceptually relevant frequency regions. These HRTF are useful in stereo enhancement and multi-channel virtual surround simulation.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: July 3, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Patent number: 8085958
    Abstract: Audio loudspeaker virtualizers and cross-talk cancellers and methods use a combination of interaural intensity difference and interaural time difference to define virtualizing filters. This allows enlargement of a listener's sweet spot based on psychoacoustic effects.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: December 27, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Steven Trautmann, Atsuhiro Sakurai, Akihiro Yonemoto
  • Patent number: 8019598
    Abstract: This invention improves the perceived quality of frequency-domain time scale modification by selection of spectral bands used in phase locking based upon a Bark scale according to the variation in human hearing frequency response. A spectral peak is identified for each band. At these peaks the phases are rotated using the phase vocoder algorithm. For a few spectral lines near these peaks, the phase differences are copied from the non-rotated spectrum. The number selected is preferably 4. Remaining spectral lines within each spectral band located farther from the peak are phase rotated using the phase vocoder algorithm. The boundaries of the spectral bands may be adjusted based upon the digital audio data to maintain important frequency groups within the same spectral band.
    Type: Grant
    Filed: November 14, 2003
    Date of Patent: September 13, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Publication number: 20100158258
    Abstract: This invention is a method for binaural localization using a cascade of resonators and anti-resonators to implement an HRTF (head-related transfer function). The spectrum of the cascade reproduces the magnitude spectrum of a desired HRTF. The proposed method provides a considerably more computationally efficient implementation of HRTF filters with no detectable deterioration of output quality while saving memory when storing a large quantity of HRTFs due to the parameterization of its resonators and anti-resonators. Finally, the method offers additional flexibility since the resonators and anti-resonators can be manipulated individually during the design process, making it possible to interpolate smoothly between HRTFs, reduce spectral coloring or achieve higher accuracy at perceptually relevant frequency regions. These HRTF are useful in stereo enhancement and multi-channel virtual surround simulation.
    Type: Application
    Filed: March 3, 2010
    Publication date: June 24, 2010
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Patent number: 7680289
    Abstract: This invention is a method for binaural localization using a cascade of resonators and anti-resonators to implement an HRTF (head-related transfer function). The spectrum of the cascade reproduces the magnitude spectrum of a desired HRTF. The proposed method provides a considerably more computationally efficient implementation of HRTF filters with no detectable deterioration of output quality while saving memory when storing a large quantity of HRTFs due to the parameterization of its resonators and anti-resonators. Finally, the method offers additional flexibility since the resonators and anti-resonators can be manipulated individually during the design process, making it possible to interpolate smoothly between HRTFs, reduce spectral coloring or achieve higher accuracy at perceptually relevant frequency regions. These HRTF are useful in stereo enhancement and multi-channel virtual surround simulation.
    Type: Grant
    Filed: November 4, 2004
    Date of Patent: March 16, 2010
    Assignee: Texas Instruments Incorporated
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Patent number: 7536017
    Abstract: Audio cross-talk cancellation by inverse HRTF matrix only for low frequencies; high frequencies rely upon the natural barrier of a listener's head. The low frequency cutoff is determined by a peak in the inverse matrix of the head-related transfer functions.
    Type: Grant
    Filed: May 10, 2005
    Date of Patent: May 19, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Publication number: 20070081663
    Abstract: This invention involves time-scale modification of audio signals. In this invention the input audio signal is separated into two frequency bands using a complementary IIR filter bank. Time-scale modification is applied separately to the individual frequency bands. The thus modified signals are recombined for output.
    Type: Application
    Filed: October 12, 2005
    Publication date: April 12, 2007
    Inventors: Atsuhiro Sakurai, Steven Trautmann, Daniel Zelazo
  • Publication number: 20070083377
    Abstract: This invention involves time-scale modification of audio signals. In this invention the input audio signal is separated into a plurality of frequency bands selected according to a Bark scale where each frequency band has an extent dependent upon human frequency perception via a filter bank. Time-scale modification is applied separately to the individual frequency bands. The thus modified signals are recombined for output.
    Type: Application
    Filed: October 12, 2005
    Publication date: April 12, 2007
    Inventors: Steven Trautmann, Atsuhiro Sakurai, Daniel Zelazo
  • Patent number: 6982377
    Abstract: A time scale modification method employs separate bands obtained through an analysis polyphase filter bank with separate time-scale modification processing for the bands. The outputs are combined using a synthesis filter bank. Some constraints are imposed on the time-scale modification processing, such a limitation of the range of overlap adjustment values for bands other than the greatest energy band, to eliminate noise due to aliasing and inter-channel phase mismatch. This invention produces output quality considerably higher than conventional time-domain time-scale modification methods for general music signals with computational requirements comparable to those of conventional time-domain time-scale modification methods.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: January 3, 2006
    Assignee: Texas Instruments Incorporated
    Inventors: Atsuhiro Sakurai, Steven Trautmann, Daniel L. Zelazo
  • Publication number: 20050254660
    Abstract: Audio cross-talk cancellation by inverse HRTF matrix only for low frequencies; high frequencies rely upon the natural barrier of a listener's head. The low frequency cutoff is determined by a peak in the inverse matrix of the head-related transfer functions.
    Type: Application
    Filed: May 10, 2005
    Publication date: November 17, 2005
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Publication number: 20050137730
    Abstract: This invention involves time-scale modification of audio signals. In this invention the input audio signal is separated into a plurality of frequency bands via a filter bank. Time-scale modification is applied separately to the individual frequency bands. The thus modified signals are recombined for output.
    Type: Application
    Filed: December 18, 2003
    Publication date: June 23, 2005
    Inventors: Steven Trautmann, Atsuhiro Sakurai, Daniel Zelazo
  • Publication number: 20050132870
    Abstract: A time scale modification method employs separate bands obtained through an analysis polyphase filter bank with separate time-scale modification processing for the bands. The outputs are combined using a synthesis filter bank. Some constraints are imposed on the time-scale modification processing, such a limitation of the range of overlap adjustment values for bands other than the greatest energy band, to eliminate noise due to aliasing and inter-channel phase mismatch. This invention produces output quality considerably higher than conventional time-domain time-scale modification methods for general music signals with computational requirements comparable to those of conventional time-domain time-scale modification methods.
    Type: Application
    Filed: December 18, 2003
    Publication date: June 23, 2005
    Inventors: Atsuhiro Sakurai, Steven Trautmann, Daniel Zelazo
  • Publication number: 20050117762
    Abstract: This invention is a method for binaural localization using a cascade of resonators and anti-resonators to implement an HRTF (head-related transfer function). The spectrum of the cascade reproduces the magnitude spectrum of a desired HRTF. The proposed method provides a considerably more computationally efficient implementation of HRTF filters with no detectable deterioration of output quality while saving memory when storing a large quantity of HRTFs due to the parameterization of its resonators and anti-resonators. Finally, the method offers additional flexibility since the resonators and anti-resonators can be manipulated individually during the design process, making it possible to interpolate smoothly between HRTFs, reduce spectral coloring or achieve higher accuracy at perceptually relevant frequency regions. These HRTF are useful in stereo enhancement and multi-channel virtual surround simulation.
    Type: Application
    Filed: November 4, 2004
    Publication date: June 2, 2005
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Publication number: 20050010397
    Abstract: This invention improves the perceived quality of frequency-domain time scale modification by selection of spectral bands used in phase locking based upon a Bark scale according to the variation in human hearing frequency response. A spectral peak is identified for each band. At these peaks the phases are rotated using the phase vocoder algorithm. For a few spectral lines near these peaks, the phase differences are copied from the non-rotated spectrum. The number selected is preferably 4. Remaining spectral lines within each spectral band located farther from the peak are phase rotated using the phase vocoder algorithm. The boundaries of the spectral bands may be adjusted based upon the digital audio data to maintain important frequency groups within the same spectral band.
    Type: Application
    Filed: November 14, 2003
    Publication date: January 13, 2005
    Inventors: Atsuhiro Sakurai, Steven Trautmann
  • Patent number: 6701418
    Abstract: A set of related methods for detecting the existence and exact nature of any rearrangements and/or inversions of address lines and/or data lines to a memory device, relative to a second set of address lines and/or data lines to the same memory, are disclosed. Moreover, a set of related methods for correcting these relative rearrangements and/or inversions are disclosed. These methods allow meaningful access to memory shared by two or more devices using different address and data paths in the case where the relative nature of the address and data paths is unknown a priori. These methods of detecting and correcting such mismatches in separate address and data lines to shared memory may be implemented either in hardware or software or a combination of both.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: March 2, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Christopher J. Poletto, Judd E. Heape, Steven Trautmann
  • Publication number: 20020120825
    Abstract: A set of related methods for detecting the existence and exact nature of any rearrangements and/or inversions of address lines and/or data lines to a memory device, relative to a second set of address lines and/or data lines to the same memory are disclosed. Moreover, a set of related methods for correcting these relative rearrangements and/or inversions are disclosed. These methods allow meaningful access to memory shared by two or more devices using different address and data paths in the case where the relative nature of the address and data paths is unknown a priori. These methods of detecting and correcting such mismatches in separate address and data lines to shared memory may be implemented either in hardware or software or a combination of both.
    Type: Application
    Filed: December 3, 2001
    Publication date: August 29, 2002
    Inventors: Christopher J. Poletto, Judd E. Heape, Steven Trautmann