Patents by Inventor Shyh-Shiaw Kuo
Shyh-Shiaw Kuo 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: 10204631Abstract: 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: GrantFiled: March 8, 2016Date of Patent: February 12, 2019Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.Inventors: James David Johnston, Shyh-Shiaw Kuo
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Publication number: 20160189721Abstract: 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: ApplicationFiled: March 8, 2016Publication date: June 30, 2016Inventors: JAMES DAVID JOHNSTON, SHYH-SHIAW KUO
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Patent number: 9305561Abstract: 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: GrantFiled: May 24, 2013Date of Patent: April 5, 2016Assignee: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo
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Publication number: 20130261779Abstract: 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: ApplicationFiled: May 24, 2013Publication date: October 3, 2013Applicant: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo
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Patent number: 8515768Abstract: Methods, systems, and apparatus are presented for decoding an audio signal that includes bandwidth extension data. An audio signal that includes core audio data and bandwidth extension data can be received in a decoder. The core audio data can be associated with a core portion of an audio signal, such as the frequency range below a cutoff frequency, and the bandwidth extension data can be associated with an extended portion of the audio signal, such as a frequency range above the cutoff frequency. The core audio data can be decoded to generate a decoded core audio signal in a time domain representation. Further, an extended portion of the audio signal can be reconstructed in accordance with extension data and decoded core audio signal. Additionally, the decoded core audio signal can be lowpass filtered and the extended portion can be highpass filtered before being combined to generate a decoded output signal.Type: GrantFiled: August 31, 2009Date of Patent: August 20, 2013Assignee: Apple Inc.Inventors: Frank Baumgarte, William Stewart, Shyh-Shiaw Kuo
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Patent number: 8452431Abstract: 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: GrantFiled: December 22, 2009Date of Patent: May 28, 2013Assignee: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo
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Patent number: 8442838Abstract: A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.Type: GrantFiled: February 22, 2011Date of Patent: May 14, 2013Assignee: Apple Inc.Inventors: Shyh-Shiaw Kuo, Hong Kaura, William G. Stewart
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Patent number: 8224661Abstract: According to one embodiment, an improved audio coding technique encodes audio having a low frequency transient signal, using a long block, but with a set of adapted masking thresholds. Upon identifying an audio window that contains a low frequency transient signal, masking thresholds for the long block may be calculated as usual. A set of masking thresholds calculated for the 8 short blocks corresponding to the long block are calculated. The masking thresholds for low frequency critical bands are adapted based on the thresholds calculated for the short blocks, and the resulting adapted masking thresholds are used to encode the long block of audio data. The result is encoded audio with rich harmonic content and negligible coder noise resulting from the low frequency transient signal.Type: GrantFiled: September 25, 2011Date of Patent: July 17, 2012Assignee: Apple Inc.Inventors: Shyh-Shiaw Kuo, Frank Baumgarte
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Publication number: 20120016679Abstract: According to one embodiment, an improved audio coding technique encodes audio having a low frequency transient signal, using a long block, but with a set of adapted masking thresholds. Upon identifying an audio window that contains a low frequency transient signal, masking thresholds for the long block may be calculated as usual. A set of masking thresholds calculated for the 8 short blocks corresponding to the long block are calculated. The masking thresholds for low frequency critical bands are adapted based on the thresholds calculated for the short blocks, and the resulting adapted masking thresholds are used to encode the long block of audio data. The result is encoded audio with rich harmonic content and negligible coder noise resulting from the low frequency transient signal.Type: ApplicationFiled: September 25, 2011Publication date: January 19, 2012Inventors: Shyh-Shiaw Kuo, Frank Baumgarte
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Patent number: 8095794Abstract: 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: GrantFiled: November 12, 2008Date of Patent: January 10, 2012Assignee: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo, Schuyler Reynier Quackenbush, William Turin
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Patent number: 8060375Abstract: An improved audio coding technique encodes audio having a low frequency transient signal, using a long block, but with a set of adapted masking thresholds. Upon identifying an audio window that contains a low frequency transient signal, masking thresholds for the long block may be calculated as usual. A set of masking thresholds calculated for the 8 short blocks corresponding to the long block are calculated. The masking thresholds for low frequency critical bands are adapted based on the thresholds calculated for the short blocks, and the resulting adapted masking thresholds are used to encode the long block of audio data. The result is encoded audio with rich harmonic content and negligible coder noise resulting from the low frequency transient signal.Type: GrantFiled: January 12, 2011Date of Patent: November 15, 2011Assignee: Apple Inc.Inventors: Shyh-Shiaw Kuo, Frank Baumgarte
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Patent number: 7970604Abstract: 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: GrantFiled: March 3, 2009Date of Patent: June 28, 2011Assignee: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo
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Publication number: 20110145004Abstract: A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.Type: ApplicationFiled: February 22, 2011Publication date: June 16, 2011Applicant: APPLE INC.Inventors: Shyh-Shiaw Kuo, Hong Kaura, William G. Stewart
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Publication number: 20110106544Abstract: An improved audio coding technique encodes audio having a low frequency transient signal, using a long block, but with a set of adapted masking thresholds. Upon identifying an audio window that contains a low frequency transient signal, masking thresholds for the long block may be calculated as usual. A set of masking thresholds calculated for the 8 short blocks corresponding to the long block are calculated. The masking thresholds for low frequency critical bands are adapted based on the thresholds calculated for the short blocks, and the resulting adapted masking thresholds are used to encode the long block of audio data. The result is encoded audio with rich harmonic content and negligible coder noise resulting from the low frequency transient signal.Type: ApplicationFiled: January 12, 2011Publication date: May 5, 2011Applicant: APPLE INC.Inventors: Shyh-Shiaw Kuo, Frank Baumgarte
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Publication number: 20110054911Abstract: Methods, systems, and apparatus are presented for decoding an audio signal that includes bandwidth extension data. An audio signal that includes core audio data and bandwidth extension data can be received in a decoder. The core audio data can be associated with a core portion of an audio signal, such as the frequency range below a cutoff frequency, and the bandwidth extension data can be associated with an extended portion of the audio signal, such as a frequency range above the cutoff frequency. The core audio data can be decoded to generate a decoded core audio signal in a time domain representation. Further, an extended portion of the audio signal can be reconstructed in accordance with extension data and decoded core audio signal. Additionally, the decoded core audio signal can be lowpass filtered and the extended portion can be highpass filtered before being combined to generate a decoded output signal.Type: ApplicationFiled: August 31, 2009Publication date: March 3, 2011Applicant: APPLE INC.Inventors: Frank Baumgarte, William Stewart, Shyh-Shiaw Kuo
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Patent number: 7899677Abstract: An improved audio coding technique encodes audio having a low frequency transient signal, using a long block, but with a set of adapted masking thresholds. Upon identifying an audio window that contains a low frequency transient signal, masking thresholds for the long block may be calculated as usual. A set of masking thresholds calculated for the 8 short blocks corresponding to the long block are calculated. The masking thresholds for low frequency critical bands are adapted based on the thresholds calculated for the short blocks, and the resulting adapted masking thresholds are used to encode the long block of audio data. The result is encoded audio with rich harmonic content and negligible coder noise resulting from the low frequency transient signal.Type: GrantFiled: November 24, 2009Date of Patent: March 1, 2011Assignee: Apple Inc.Inventors: Shyh-Shiaw Kuo, Frank Baumgarte
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Patent number: 7895045Abstract: A hybrid audio encoding technique incorporates both ABR, or CBR, and VBR encoding modes. For each audio coding block, after a VBR quantization loop meets the NMR target, a second quantization loop might be called to adaptively control the final bitrate. That is, if the NMR-based quantization loop results in a bitrate that is not within a specified range, then a bitrate-based CBR or ABR quantization loop determines a final bitrate that is within the range and is adaptively determined based on the encoding difficulty of the audio data. Excessive bitrates from use of conventional VBR mode are eliminated, while still providing much more constant perceptual sound quality than use of conventional CBR mode can achieve.Type: GrantFiled: November 2, 2009Date of Patent: February 22, 2011Assignee: Apple Inc.Inventors: Shyh-shiaw Kuo, Hong Kaura, William G. Stewart
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Patent number: 7882357Abstract: 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: GrantFiled: April 4, 2006Date of Patent: February 1, 2011Assignee: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo, Schuyler Reynier Quackenbush, William Turin
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Patent number: 7802101Abstract: A system and method of retrieving a watermark in a watermarked signal are disclosed. The watermarked signal comprises odd and even overlapped blocks where the watermark is contained in the even blocks. The method comprises, for each k-th even block, subtracting the two adjacent odd numbered blocks from the k-th even block of the watermarked signal to retrieve s *k(n), transforming s *k(n) into the frequency domain to generate S k(f), calculating a phase of S k(f) as ? (f) and a phase of Sk(f) as ?(f), calculating the difference ? (f) between ? (f) and ?(f), unwrapping ? (f) to obtain the phase modulation {tilde over (?)} k(f), and using a Viterbi search to retrieve the watermark embedded in {tilde over (?)} k(f).Type: GrantFiled: March 30, 2009Date of Patent: September 21, 2010Assignee: AT&T Intellectual Property II, L.P.Inventors: James David Johnston, Shyh-Shiaw Kuo, Schuyler Reynier Quackenbush, William Turin
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Publication number: 20100100211Abstract: 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: ApplicationFiled: December 22, 2009Publication date: April 22, 2010Applicant: AT&T Corp.Inventors: James David Johnston, Shyh-Shiaw Kuo