Atsuhiro Sakurai
Atsuhiro Sakurai, Tsukuba-Shi JP
Patent application number | Description | Published |
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20090144064 | Local Pitch Control Based on Seamless Time Scale Modification and Synchronized Sampling Rate Conversion - 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. | 06-04-2009 |
20110026718 | VIRTUALIZER WITH CROSS-TALK CANCELLATION AND REVERB - 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. | 02-03-2011 |
Atsuhiro Sakurai, Tokyo JP
Patent application number | Description | Published |
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20100239097 | Method and System for Determining a Gain Reduction Parameter Level for Loudspeaker Equalization - 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. | 09-23-2010 |
Atsuhiro Sakurai, Ibaraki JP
Patent application number | Description | Published |
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20100158258 | Binaural Sound Localization Using a Formant-Type Cascade of Resonators and Anti-Resonators - 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. | 06-24-2010 |
Atsuhiro Sakurai, Tsukuba JP
Patent application number | Description | Published |
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20090060203 | REBALANCING OF AUDIO - 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. | 03-05-2009 |
20090060211 | Method and System for Music Detection - 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. | 03-05-2009 |
20090062945 | Method and System for Estimating Frequency and Amplitude Change of Spectral Peaks - 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. | 03-05-2009 |
20090063138 | Method and System for Determining Predominant Fundamental Frequency - 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. | 03-05-2009 |