Patents by Inventor Atsuhiro Sakurai
Atsuhiro Sakurai 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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Patent number: 8275475Abstract: Methods, digital systems, and computer readable media are provided for estimating change of amplitude and frequency in a digital audio signal by transforming a frame of the digital audio signal to the frequency domain, locating a frequency peak in the transformed frame, determining an interpolated peak of the located frequency peak, computing inner products of a portion of the transformed frame about the interpolated peak with a plurality of test signals, and estimating change of amplitude and change of frequency for the frequency peak from results of the inner products.Type: GrantFiled: August 18, 2008Date of Patent: September 25, 2012Assignee: Texas Instruments IncorporatedInventors: Steven David Trautmann, Atsuhiro Sakurai, Ryo Tsutsui
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Patent number: 8213622Abstract: 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: GrantFiled: March 3, 2010Date of Patent: July 3, 2012Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven Trautmann
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Patent number: 8155972Abstract: This invention involves time-scale modification of audio signals. The invention describes overlap and add time scale modification with variable input and output buffer sizes. Seamless speed change is achieved by keeping track of previously processed data to avoid discontinuities during playback speed transitions.Type: GrantFiled: October 5, 2005Date of Patent: April 10, 2012Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Yoshihide Iwata
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Patent number: 8121299Abstract: Methods, digital systems, and computer readable media are provided for detection of music in an audio signal. Music is detected by partitioning the audio signal into overlapping frames, determining a fundamental frequency of a frame in the overlapping frames, including the fundamental frequency of the frame in a histogram of fundamental frequency values of frames occurring in the audio signal prior to the frame, and indicating that music is present in the audio signal when a number of occurrences of a fundamental frequency value in the histogram exceeds a threshold.Type: GrantFiled: August 4, 2008Date of Patent: February 21, 2012Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven David Trautmann
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Patent number: 8085940Abstract: Rebalancing of an audio signal refers to achieving a balance of perceived loudness, typically of right and left channels, given an unbalanced input. A flexible method to automatically rebalance an audio input signal is robust against noise in extreme cases through the individual channels combined in various ways as a function of the loudness ratio between input channels.Type: GrantFiled: August 7, 2008Date of Patent: December 27, 2011Assignee: Texas Instruments IncorporatedInventors: Steven David Trautmann, Atsuhiro Sakurai, Ryo Tsutsui
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Patent number: 8085951Abstract: Methods, digital systems, and computer readable media are provided for determining a gain reduction parameter level for loudspeaker equalization by determining a noise score, an equalization effectiveness score, and an equalization non-effectiveness score for a candidate gain reduction parameter level, determining a composite quality score using the three scores, and designing a compensating filter for the loudspeaker using the candidate gain reduction parameter level if the composite quality score is better than composite quality scores of all other candidate gain reduction parameter levels.Type: GrantFiled: March 23, 2009Date of Patent: December 27, 2011Assignee: Texas Instruments IncorporatedInventors: Steven David Trautmann, Akihiro Yonemoto, Atsuhiro Sakurai
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Patent number: 8085958Abstract: 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: GrantFiled: May 23, 2007Date of Patent: December 27, 2011Assignee: Texas Instruments IncorporatedInventors: Steven Trautmann, Atsuhiro Sakurai, Akihiro Yonemoto
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Patent number: 8065140Abstract: Methods, digital systems, and computer readable media are provided for determining a predominant fundamental frequency of a frame of an audio signal by finding a maximum absolute signal value in history data for the frame, determining a number of bits for downshifting based on the maximum absolute signal value, computing autocorrelations for the frame using signal values downshifted by the number of bits, and determining the predominant fundamental frequency using the computed autocorrelations.Type: GrantFiled: August 4, 2008Date of Patent: November 22, 2011Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven David Trautmann
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Patent number: 8050934Abstract: This invention locally controls the pitch of speech and audio signals. The invention is based on a seamless time scale modification (S-TSM) scheme connected to a synchronized sampling rate converter that switches between different time scale factors in a seamless manner and controls pitch during playback in a nearly continuous way.Type: GrantFiled: November 29, 2007Date of Patent: November 1, 2011Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Yoshihide Iwata, Steven D. Trautmann
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Patent number: 8019598Abstract: 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: GrantFiled: November 14, 2003Date of Patent: September 13, 2011Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven Trautmann
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Patent number: 7974418Abstract: Audio loudspeaker and headphone virtualizers and cross-talk cancellers and methods use separate virtual speaker locations for different Bark frequency bands and a single reverberation filter for multi-channel virtualizer inputs.Type: GrantFiled: February 28, 2006Date of Patent: July 5, 2011Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven D. Trautmann, Hironori Kakemizu, Yoshihide Iwata
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Publication number: 20110026718Abstract: Audio loudspeaker and headphone virtualizers and cross-talk cancellers and methods use separate virtual speaker locations for different Bark frequency bands and a single reverberation filter for multi-channel virtualizer inputs.Type: ApplicationFiled: October 7, 2010Publication date: February 3, 2011Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Steven D. Trautmann, Atsuhiro Sakurai, Hironori Kakemizu
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Patent number: 7835535Abstract: Audio loudspeaker and headphone virtualizers and cross-talk cancellers and methods use separate virtual speaker locations for different Bark frequency bands and a single reverberation filter for multi-channel virtualizer inputs.Type: GrantFiled: March 1, 2006Date of Patent: November 16, 2010Assignee: Texas Instruments IncorporatedInventors: Steven D. Trautmann, Atsuhiro Sakurai, Hironori Kakemizu
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Publication number: 20100239097Abstract: Methods, digital systems, and computer readable media are provided for determining a gain reduction parameter level for loudspeaker equalization by determining a noise score, an equalization effectiveness score, and an equalization non-effectiveness score for a candidate gain reduction parameter level, determining a composite quality score using the three scores, and designing a compensating filter for the loudspeaker using the candidate gain reduction parameter level if the composite quality score is better than composite quality scores of all other candidate gain reduction parameter levels.Type: ApplicationFiled: March 23, 2009Publication date: September 23, 2010Inventors: Steven David Trautmann, Akihiro Yonemoto, Atsuhiro Sakurai
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Publication number: 20100158258Abstract: 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: ApplicationFiled: March 3, 2010Publication date: June 24, 2010Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Atsuhiro Sakurai, Steven Trautmann
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Patent number: 7715575Abstract: Audio loudspeaker and headphone virtualizers and methods use room impulse responses with modified individual head-related transfer functions prior to superposition including middle truncation; and perform convolutions in the frequency domain with zero-padded sections to avoid circular convolution overlap.Type: GrantFiled: February 28, 2006Date of Patent: May 11, 2010Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven David Trautmann
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Patent number: 7680289Abstract: 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: GrantFiled: November 4, 2004Date of Patent: March 16, 2010Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven Trautmann
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Patent number: 7580761Abstract: A time-domain time-scale modification method based on the synchronous overlap-and-add method consists of a generalization of the envelope-matching time-scale modification method. The cross-correlation function employs a fixed-size cross-correlation buffer to eliminate the need for normalization inside the search loop. This fixed-size cross-correlation buffer is the center of the overlap region corresponding to the case where the fine overlap adjustment value is set to zero. The computational cost of this invention is lower than any other method with a comparable quality.Type: GrantFiled: November 14, 2003Date of Patent: August 25, 2009Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Yoshihide Iwata
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Publication number: 20090144064Abstract: This invention locally controls the pitch of speech and audio signals. The invention is based on a seamless time scale modification (S-TSM) scheme connected to a synchronized sampling rate converter that switches between different time scale factors in a seamless manner and controls pitch during playback in a nearly continuous way.Type: ApplicationFiled: November 29, 2007Publication date: June 4, 2009Inventors: Atsuhiro Sakurai, Yoshihide Iwata, Steven D. Trautmann
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Patent number: 7536017Abstract: 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: GrantFiled: May 10, 2005Date of Patent: May 19, 2009Assignee: Texas Instruments IncorporatedInventors: Atsuhiro Sakurai, Steven Trautmann