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公开(公告)号：US11227613B2
公开(公告)日：2022-01-18
申请号：US16747269
申请日：2020-01-20
IPC分类号： G10L19/005 , G10L19/025
摘要： A frame error concealment method based on frames including transform coefficient vectors including the following steps: It tracks sign changes between corresponding transform coefficients of predetermined sub-vectors of consecutive good stationary frames. It accumulates the number of sign changes in corresponding sub-vectors of a predetermined number of consecutive good stationary frames. It reconstructs an erroneous frame with the latest good stationary frame, but with reversed signs of transform coefficients in sub-vectors having an accumulated number of sign changes that exceeds a predetermined threshold.
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公开(公告)号：US09966082B2
公开(公告)日：2018-05-08
申请号：US15210505
申请日：2016-07-14
IPC分类号： G10L19/00 , G10L19/028 , G10L19/02 , G10L19/038
CPC分类号： G10L19/02 , G10L19/0212 , G10L19/028 , G10L19/038 , G10L21/038 , G10L2019/0007
摘要： A spectrum filler for filling non-coded residual sub-vectors of a transform coded audio signal includes a sub-vector compressor configured to compress actually coded residual sub-vectors. A sub-vector rejecter is configured to reject compressed residual sub-vectors that do not fulfill a predetermined sparseness criterion. A sub-vector collector is configured to concatenate the remaining compressed residual sub-vectors to form a first virtual codebook. A coefficient combiner is configured to combine pairs of coefficients of the first virtual codebook to form a second virtual codebook. A sub-vector filler is configured to fill non-coded residual sub-vectors below a predetermined frequency with coefficients from the first virtual codebook, and to fill non-coded residual sub-vectors above the predetermined frequency with coefficients from the second virtual codebook.
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公开(公告)号：US20160343381A1
公开(公告)日：2016-11-24
申请号：US15228395
申请日：2016-08-04
IPC分类号： G10L19/02 , G10L19/002 , G10L19/038 , G10L19/028
摘要： An encoder for encoding frequency transform coefficients of a harmonic audio signal include the following elements: A peak locator configured to locate spectral peaks having magnitudes exceeding a predetermined frequency dependent threshold. A peak region encoder configured to encode peak regions including and surrounding the located peaks. A low-frequency set encoder configured to encode at least one low-frequency set of coefficients outside the peak regions and below a crossover frequency that depends on the number of bits used to encode the peak regions. A noise-floor gain encoder configured to encode a noise-floor gain of at least one high-frequency set of not yet encoded coefficients outside the peak regions.
摘要翻译： 用于编码谐波音频信号的频率变换系数的编码器包括以下元件：配置为定位具有超过预定频率相关阈值的幅度的频谱峰值的峰值定位器。 峰值区域编码器，被配置为编码包括并围绕定位的峰值的峰值区域。 低频组合编码器被配置为对峰值区域之外的至少一个低频系数组进行编码，并且低于取决于用于编码峰值区域的位数的交叉频率。 噪声层增益编码器，被配置为编码峰值区域之外的尚未编码系数的至少一个高频组的噪声本底增益。
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公开(公告)号：US20230410822A1
公开(公告)日：2023-12-21
申请号：US18365322
申请日：2023-08-04
IPC分类号： G10L19/02 , G10L21/038 , G10L19/028 , G10L19/038
CPC分类号： G10L19/02 , G10L19/0212 , G10L2019/0007 , G10L19/028 , G10L19/038 , G10L21/038
摘要： A spectrum filler for filling non-coded residual sub-vectors of a transform coded audio signal includes a sub-vector compressor configured to compress actually coded residual sub-vectors. A sub-vector rejecter is configured to reject compressed residual sub-vectors that do not fulfill a predetermined sparseness criterion. A sub-vector collector is configured to concatenate the remaining compressed residual sub-vectors to form a first virtual codebook. A coefficient combiner is configured to combine pairs of coefficients of the first virtual codebook to form a second virtual codebook. A sub-vector filler is configured to fill non-coded residual sub-vectors below a predetermined frequency with coefficients from the first virtual codebook, and to fill non-coded residual sub-vectors above the predetermined frequency with coefficients from the second virtual codebook.
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公开(公告)号：US09691398B2
公开(公告)日：2017-06-27
申请号：US15352729
申请日：2016-11-16
IPC分类号： G10L19/00 , G10L19/02 , G10L19/038 , G10L19/10 , G10L19/035
CPC分类号： G10L19/02 , G10L19/0212 , G10L19/035 , G10L19/038 , G10L19/10
摘要： The embodiments of the present invention improves conventional attenuation schemes by replacing constant attenuation with an adaptive attenuation scheme that allows more aggressive attenuation, without introducing audible change of signal frequency characteristics.
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公开(公告)号：US20240321283A1
公开(公告)日：2024-09-26
申请号：US18678054
申请日：2024-05-30
IPC分类号： G10L19/02 , G10L19/002 , G10L19/028 , G10L19/038
CPC分类号： G10L19/0212 , G10L19/002 , G10L19/028 , G10L19/038
摘要： An encoder for encoding frequency transform coefficients of a harmonic audio signal include the following elements: A peak locator configured to locate spectral peaks having magnitudes exceeding a predetermined frequency dependent threshold. A peak region encoder configured to encode peak regions including and surrounding the located peaks. A low-frequency set encoder configured to encode at least one low-frequency set of coefficients outside the peak regions and below a crossover frequency that depends on the number of bits used to encode the peak regions. A noise-floor gain encoder configured to encode a noise-floor gain of at least one high-frequency set of not yet encoded coefficients outside the peak regions.
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公开(公告)号：US11837240B2
公开(公告)日：2023-12-05
申请号：US17570460
申请日：2022-01-07
IPC分类号： G10L19/005 , G10L19/025
CPC分类号： G10L19/005 , G10L19/025
摘要： A frame error concealment method based on frames including transform coefficient vectors including the following steps: It tracks sign changes between corresponding transform coefficients of predetermined sub-vectors of consecutive good stationary frames. It accumulates the number of sign changes in corresponding sub-vectors of a predetermined number of consecutive good stationary frames. It reconstructs an erroneous frame with the latest good stationary frame, but with reversed signs of transform coefficients in sub-vectors having an accumulated number of sign changes that exceeds a predetermined threshold.
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公开(公告)号：US10013989B2
公开(公告)日：2018-07-03
申请号：US15271930
申请日：2016-09-21
IPC分类号： G10L19/005 , G10L19/025
CPC分类号： G10L19/005 , G10L19/025
摘要： A frame error concealment method based on frames including transform coefficient vectors including the following steps: It tracks sign changes between corresponding transform coefficients of predetermined sub-vectors of consecutive good stationary frames. It accumulates the number of sign changes in corresponding sub-vectors of a predetermined number of consecutive good stationary frames. It reconstructs an erroneous frame with the latest good stationary frame, but with reversed signs of transform coefficients in sub-vectors having an accumulated number of sign changes that exceeds a predetermined threshold.
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公开(公告)号：US10002617B2
公开(公告)日：2018-06-19
申请号：US15450271
申请日：2017-03-06
IPC分类号： G10L19/00 , G10L19/02 , G10L21/0388 , G10L19/028 , G10L25/21
CPC分类号： G10L19/0204 , G10L19/02 , G10L19/028 , G10L21/0388 , G10L25/21
摘要： Methods and arrangements in a codec for supporting bandwidth extension, BWE, of a harmonic audio signal. The method in the decoder part of the codec comprises receiving a plurality of gain values associated with a frequency band b and a number of adjacent frequency bands of band b. The method further comprises determining whether a reconstructed corresponding frequency band b′ comprises a spectral peak. When the band b′ comprises a spectral peak, a gain value associated with the band b′ is set to a first value based on the received plurality of gain values; and otherwise the gain value is set to a second value based on the received plurality of gain values. The suggested technology enables bringing gain values into agreement with peak positions in a bandwidth extended frequency region.
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公开(公告)号：US11756560B2
公开(公告)日：2023-09-12
申请号：US18079088
申请日：2022-12-12
IPC分类号： G10L19/02 , G10L21/038 , G10L19/028 , G10L19/038 , G10L19/00
CPC分类号： G10L19/02 , G10L19/028 , G10L19/0212 , G10L19/038 , G10L21/038 , G10L2019/0007
摘要： A spectrum filler for filling non-coded residual sub-vectors of a transform coded audio signal includes a sub-vector compressor configured to compress actually coded residual sub-vectors. A sub-vector rejecter is configured to reject compressed residual sub-vectors that do not fulfill a predetermined sparseness criterion. A sub-vector collector is configured to concatenate the remaining compressed residual sub-vectors to form a first virtual codebook. A coefficient combiner is configured to combine pairs of coefficients of the first virtual codebook to form a second virtual codebook. A sub-vector filler is configured to fill non-coded residual sub-vectors below a predetermined frequency with coefficients from the first virtual codebook, and to fill non-coded residual sub-vectors above the predetermined frequency with coefficients from the second virtual codebook.
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