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1.发明授权Decoding method and apparatus for an audio signal through high frequency compensation 有权通过高频补偿的音频信号的解码方法和装置公开(公告)号：US08788275B2
公开(公告)日：2014-07-22
申请号：US11902325
申请日：2007-09-20
CPC分类号： G10L19/24 , G10L21/0364
摘要： A decoding apparatus decodes a first encoded data that is encoded from a low-frequency component of an audio signal, and a second encoded data that is used when creating a high-frequency component of an audio signal from a low-frequency component and encoded in accordance with a certain bandwidth, into the audio signal. In the decoding apparatus, a high-frequency component detecting unit divides the high-frequency component into bands with a certain interval range correspondingly to the certain bandwidth, and detects magnitude of the high-frequency components corresponding to each of the bands. A high-frequency component compensating unit compensates the high-frequency components based on the magnitude of the high-frequency components corresponding to each of the bands detected by the high-frequency component detecting unit. A decoding unit that decodes the low-frequency component decoded from the first encoded data, and the high-frequency components compensated by the high-frequency component compensating unit, into the audio signal.
摘要翻译： 解码装置对从音频信号的低频分量编码的第一编码数据和从低频分量创建音频信号的高频分量而使用的第二编码数据进行解码， 按照一定的带宽，进入音频信号。 在解码装置中，高频成分检测部将该高频成分与特定带宽对应地设定为一定的间隔范围的频带，并检测与各频带对应的高频成分的大小。 高频分量补偿单元基于与由高频分量检测单元检测到的每个频带对应的高频分量的大小来补偿高频分量。 解码单元，将从第一编码数据解码的低频分量和由高频分量补偿单元补偿的高频分量解码成音频信号。
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2.发明授权公开(公告)号：US08612219B2
公开(公告)日：2013-12-17
申请号：US11907341
申请日：2007-10-11
CPC分类号： G10L19/002 , G10L21/038
摘要： An SBR encoder includes a filter bank that receives an input signal, a time/frequency grid generator that controls a number of bits of various parameters, a parameter calculator that calculates various parameters, a parameter coding unit that encodes the parameters, an upper-limit number-of-bit storage unit that stores an upper limit of the number of bit of encoded data of high-frequency component finally generated in a high-pass encoding process, and a number-of-bit controller. The number-of-bit controller controls the high-pass encoding process by preferentially encoding a parameter having a large influence to sound quality and not encoding a parameter having a small influence to the sound quality relative to a plurality of parameters, so that the number of bits of the encoded data of high-frequency component finally generated in the high-pass encoding process becomes equal to or less than the upper limit to be stored in the upper-limit number-of-bit storage unit.
摘要翻译： SBR编码器包括接收输入信号的滤波器组，控制各种参数的位数的时间/频率网格发生器，计算各种参数的参数计算器，对参数进行编码的参数编码单元，上限 位数存储单元，其存储在高通编码处理中最终生成的高频分量的编码数据的比特数的上限，以及比特数控制器。 位数控制器通过优先编码对声音质量影响很大的参数并且不对相对于多个参数对声音质量影响小的参数进行编码来控制高通编码处理，使得数字 在高通编码处理中最终生成的高频分量的编码数据的比特数变得等于或小于要存储在上限位数存储单元中的上限。
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公开(公告)号：US07930185B2
公开(公告)日：2011-04-19
申请号：US12073276
申请日：2008-03-03
CPC分类号： G10L19/035 , G10L25/27
摘要： To alleviate degradation of sound quality which may be caused by pre-echoes and bit starvation. An acoustic analyzer analyzes an audio signal to calculate perceptual entropy indicating how many bits are required for quantization. A coded bit count monitor monitors the number of coded bits produced from the audio signal and calculates the number of available bits for the current frame. Based on the combination of the perceptual entropy and the number of available bits, a frame division number determiner determines a division number N for dividing a frame of the audio signal into N blocks. An orthogonal transform processor divides a frame by the determined division number and subjects each divided block of the audio signal to an orthogonal transform process, thereby obtaining orthogonal transform coefficients. A quantizer quantizes the orthogonal transform coefficients on a divided block basis.
摘要翻译： 以缓解由回声和位饥饿引起的声音质量下降。 声学分析仪分析音频信号以计算感知熵，指示量化所需的位数。 编码比特计数监视器监视从音频信号产生的编码比特数，并计算当前帧的可用比特数。 基于感知熵与可用比特数的组合，帧分割数确定器确定用于将音频信号的帧划分成N个块的分割数N. 正交变换处理器将帧除以确定的分割数，并将音频信号的每个分割块进行正交变换处理，从而获得正交变换系数。 量化器基于分割块量化正交变换系数。
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公开(公告)号：US08244524B2
公开(公告)日：2012-08-14
申请号：US12654591
申请日：2009-12-23
IPC分类号： G10L19/14
CPC分类号： G10L19/02
摘要： An encoding apparatus including an SBR (Spectral Band Replication) encoder creates high-frequency-component encoded data with reduced bits. The encoding apparatus converts an input signal into a frequency-domain spectrum signal, divides the converted spectrum signal into an arbitrary number of segments with respect to a time axis and a frequency axis, calculates a spectrum power of each segment and a feature parameter that represents a feature of the corresponding spectrum power, calculates a masking threshold using the calculated spectrum power of each segment, detects a segment having a spectrum power equal to or less than the calculated masking threshold, corrects the spectrum power of the detected segment, and encodes both the corrected spectrum power and the calculated feature parameter. The correction reduces a difference between quantization values, reducing the number of encoded bits.
摘要翻译： 包括SBR（光谱带复制）编码器的编码装置利用减少的位来创建高频分量编码数据。 编码装置将输入信号转换为频域频谱信号，将经转换的频谱信号相对于时间轴和频率轴分割为任意数量的片段，计算每个片段的频谱功率和表示 使用相应频谱功率的特征，使用所计算的每个段的频谱功率来计算掩蔽阈值，检测具有等于或小于所计算的掩蔽阈值的频谱功率的段，校正所检测到的段的频谱功率，并对两者进行编码 校正的频谱功率和计算的特征参数。 校正减少量化值之间的差异，减少编码比特数。
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公开(公告)号：US20080288262A1
公开(公告)日：2008-11-20
申请号：US11902732
申请日：2007-09-25
IPC分类号： G10L19/00
CPC分类号： G10L19/24 , G10L21/038
摘要： A decoding apparatus that decodes a first encoded data that is encoded into a first time range from a low-frequency component of an audio signal, and a second encoded data that is used when creating a high-frequency component of the audio signal from the low-frequency component and encoded into a second time range, into the audio signal. In the decoding apparatus, a high-frequency component compensating unit that compensates the high-frequency component created from the second encoded data based on the first time range. A decoding unit that decodes into the audio signal by synthesizing the high-frequency component compensated by the high-frequency component compensating unit, and the low-frequency component decoded from the first encoded data.
摘要翻译： 一种解码装置，将从音频信号的低频分量编码成第一时间范围的第一编码数据和从低频产生音频信号的高频分量时使用的第二编码数据 频率分量并编码到第二时间范围内，进入音频信号。 在解码装置中，根据第一时间范围，补偿从第二编码数据生成的高频分量的高频分量补偿部。 解码单元，其通过合成由高频分量补偿单元补偿的高频分量和从第一编码数据解码的低频分量来解码为音频信号。
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公开(公告)号：US08073050B2
公开(公告)日：2011-12-06
申请号：US12068833
申请日：2008-02-12
IPC分类号： H04N7/12
CPC分类号： G10L21/038 , G10L19/083
摘要： When creating SBR data in a the low-resolution mode, an encoding device divides a high-frequency component of input audio data being encoded by SBR method into a high-frequency band and a low-frequency band, and calculates an average high-frequency power value that indicates the average value of the power in the high-frequency band of the audio data, as well as an average low-frequency power value that indicates the average value of the power in the low-frequency band of the audio data. The encoding device then compares the average high-frequency power value and the average low-frequency power value, selecting the smaller of the two. The encoding device then corrects the power of the high-frequency component of the signal being encoded by the SBR method so that it equals the selected average power value.
摘要翻译： 当以低分辨率模式创建SBR数据时，编码装置将由SBR方法编码的输入音频数据的高频分量划分成高频带和低频带，并计算平均高频 指示音频数据的高频带中的功率的平均值的功率值以及指示音频数据的低频带中的功率的平均值的平均低频功率值。 然后，编码装置比较平均高频功率值和平均低频功率值，选择两者中较小的一个。 然后，编码装置校正由SBR方法编码的信号的高频分量的功率，使得其等于所选择的平均功率值。
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公开(公告)号：US07734053B2
公开(公告)日：2010-06-08
申请号：US11390054
申请日：2006-03-27
CPC分类号： G10L19/0204 , G10L19/002 , G10L19/008
摘要： An encoding apparatus compresses a stereo signal using a sum signal and a difference signal of a left component signal and a right component signal of the stereo signal. The encoding apparatus includes a calculating unit that calculates complexity of the sum signal and complexity of the difference signal; a setting unit that sets, based on the complexity, an allocation rate of bits to be allocated in quantizing the sum signal and the difference signal; and a quantizing unit that quantizes the sum signal and the difference signal based on the allocation rate.
摘要翻译： 编码装置使用和信号和立体声信号的左分量信号和右分量信号的差分信号来压缩立体声信号。 编码装置包括计算和信号的复杂度和差分信号的复杂度的计算单元; 设置单元，其基于复杂度设置在量化所述和信号和所述差信号中要分配的比特的分配速率; 以及量化单元，其基于分配率量化和信号和差分信号。
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公开(公告)号：US20090070120A1
公开(公告)日：2009-03-12
申请号：US12232096
申请日：2008-09-10
IPC分类号： G10L19/00
CPC分类号： G10L19/0204
摘要： According to an aspect of an embodiment, a method for regenerating an audio signal including a low frequency component and a high frequency component by decoding a coded data including a first coded data and a second coded data, the method comprising the steps of: generating the low frequency component; generating the high frequency component; determining whether the low frequency component has transient characteristics or not; generating a low frequency correction component by removing a stationary component when the audio signal has the transient characteristics; generating a corrected high frequency component by correcting the high-frequency component on the basis of the duration of the low frequency correction component when the audio signal has the transient characteristics; and regenerating the audio signal by synthesizing the low frequency component with the corrected high-frequency component.
摘要翻译： 根据实施例的一个方面，一种用于通过对包括第一编码数据和第二编码数据的编码数据进行解码来再生包括低频分量和高频分量的音频信号的方法，所述方法包括以下步骤： 低频分量; 产生高频分量; 确定低频分量是否具有瞬态特性; 当音频信号具有瞬态特性时通过去除固定分量来产生低频校正分量; 当音频信号具有瞬态特性时，通过基于低频校正分量的持续时间校正高频分量来产生校正的高频分量; 以及通过利用所述校正的高频分量合成所述低频分量来再生所述音频信号。
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公开(公告)号：US20080219344A1
公开(公告)日：2008-09-11
申请号：US12068833
申请日：2008-02-12
IPC分类号： H04B1/66
CPC分类号： G10L21/038 , G10L19/083
摘要： When creating SBR data in a the low-resolution mode, an encoding device divides a high-frequency component of input audio data being encoded by SBR method into a high-frequency band and a low-frequency band, and calculates an average high-frequency power value that indicates the average value of the power in the high-frequency band of the audio data, as well as an average low-frequency power value that indicates the average value of the power in the low-frequency band of the audio data. The encoding device then compares the average high-frequency power value and the average low-frequency power value, selecting the smaller of the two. The encoding device then corrects the power of the high-frequency component of the signal being encoded by the SBR method so that it equals the selected average power value.
摘要翻译： 当以低分辨率模式创建SBR数据时，编码装置将由SBR方法编码的输入音频数据的高频分量划分成高频带和低频带，并计算平均高频 指示音频数据的高频带中的功率的平均值的功率值以及指示音频数据的低频带中的功率的平均值的平均低频功率值。 然后，编码装置比较平均高频功率值和平均低频功率值，选择两者中较小的一个。 然后，编码装置校正由SBR方法编码的信号的高频分量的功率，使得其等于所选择的平均功率值。
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公开(公告)号：US20080154589A1
公开(公告)日：2008-06-26
申请号：US12073276
申请日：2008-03-03
IPC分类号： G10L19/00
CPC分类号： G10L19/035 , G10L25/27
摘要： To alleviate degradation of sound quality which may be caused by pre-echoes and bit starvation. An acoustic analyzer analyzes an audio signal to calculate perceptual entropy indicating how many bits are required for quantization. A coded bit count monitor monitors the number of coded bits produced from the audio signal and calculates the number of available bits for the current frame. Based on the combination of the perceptual entropy and the number of available bits, a frame division number determiner determines a division number N for dividing a frame of the audio signal into N blocks. An orthogonal transform processor divides a frame by the determined division number and subjects each divided block of the audio signal to an orthogonal transform process, thereby obtaining orthogonal transform coefficients. A quantizer quantizes the orthogonal transform coefficients on a divided block basis.
摘要翻译： 以缓解由回声和位饥饿引起的声音质量下降。 声学分析仪分析音频信号以计算感知熵，指示量化所需的位数。 编码比特计数监视器监视从音频信号产生的编码比特数，并计算当前帧的可用比特数。 基于感知熵与可用比特数的组合，帧分割数确定器确定用于将音频信号的帧划分成N个块的分割数N. 正交变换处理器将帧除以确定的分割数，并将音频信号的每个分割块进行正交变换处理，从而获得正交变换系数。 量化器基于分割块量化正交变换系数。
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