公开(公告)号：US20130006644A1

公开(公告)日：2013-01-03

申请号：US13173085

申请日：2011-06-30

申请人： Dongping Jiang ,  Hao Yuan ,  Guoming Chen ,  Ke Peng ,  Jiali Li

发明人： Dongping Jiang ,  Hao Yuan ,  Guoming Chen ,  Ke Peng ,  Jiali Li

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/0204 ,  G10L19/0212 ,  G10L19/028

摘要： The present invention relates to a method and device for spectral band replication, and a method and system for audio decoding, and the method for spectral band replication comprises: A. searching for the position of a certain tone of an audio signal in MDCT frequency domain coefficients; B. according to the tone position, determining a spectral band replication period which is a bandwidth from a 0 frequency point to a frequency point of tone position, and a source frequency segment which is a frequency segment from a frequency point of the 0 frequency point shifting copyband_offset frequency points backwards to a frequency point of the frequency point of the tone position shifting the copyband_offset frequency points backwards, wherein said offset copyband_offset is greater than or equal to 0; and C. according to the spectral band replication period, carrying out spectral band replication on zero bit encoding subbands.

摘要翻译： 本发明涉及一种用于频谱带复制的方法和装置，以及用于音频解码的方法和系统，以及用于频谱带复制的方法包括：A.在MDCT频域中搜索音频信号的某个音调的位置 系数; B.根据音调位置，确定作为从0频点到音调位置的频率点的带宽的频谱带复制周期，以及作为从0频点的频率点开始的频率段的源频段 将复制频带偏移频率点向后移动到音调位置的频率点的频率点向后移动复制频带偏移频率点，其中所述偏移拷贝频带偏移大于或等于0; 和C.根据频谱带复制周期，在零比特编码子带上进行频谱带复制。

公开(公告)号：US08874450B2

公开(公告)日：2014-10-28

申请号：US13580855

申请日：2011-01-12

申请人： Ke Peng ,  Guoming Chen ,  Hao Yuan ,  Dongping Jiang ,  Jiali Li

发明人： Ke Peng ,  Guoming Chen ,  Hao Yuan ,  Dongping Jiang ,  Jiali Li

IPC分类号： G10L19/00 ,  G10L19/24 ,  G10L19/025

CPC分类号： G10L19/24 ,  G10L19/025

摘要： Hierarchical audio coding and decoding method and system and hierarchical audio coding and decoding method for transient signals are provided. In the present invention, by introducing a processing method for transient signal frames in the hierarchical audio coding and decoding methods, a segmented time-frequency transform is performed on the transient signal frames, and then the frequency-domain coefficients obtained by transformation are rearranged respectively within the core layer and within the extended layer, so as to perform the same subsequent coding processes, such as bit allocation, frequency-domain coefficient coding, etc., as those on the steady-state signal frames, thus enhancing the coding efficiency of the transient signal frames and improving the quality of the hierarchical audio coding and decoding.

摘要翻译： 提供了分层音频编码和解码方法以及用于瞬态信号的系统和分层音频编码和解码方法。 在本发明中，通过在分层音频编码和解码方法中引入用于瞬态信号帧的处理方法，对瞬态信号帧执行分段时间频率变换，然后分别重新分配由变换获得的频域系数 在核心层内和扩展层内，进行与稳态信号帧相同的随后的编码处理，如比特分配，频域系数编码等，从而提高编码效率 瞬态信号帧和提高分层音频编码和解码的质量。

公开(公告)号：US20130006645A1

公开(公告)日：2013-01-03

申请号：US13173367

申请日：2011-06-30

申请人： Dongping Jiang ,  Hao Yuan ,  Ke Peng ,  Guoming Chen ,  Jiali Li

发明人： Dongping Jiang ,  Hao Yuan ,  Ke Peng ,  Guoming Chen ,  Jiali Li

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/0204 ,  G10L19/0212 ,  G10L19/028 ,  H03M7/3082 ,  H03M7/4037

摘要： The present invention relates to a method and system for audio encoding and decoding and a method for estimating a noise level, and the method for estimating a noise level in the present invention comprises: estimating a power spectrum of an audio signal to be encoded according to a frequency domain coefficient of the audio signal to be encoded; and estimating a noise level of a zero bit encoding subband audio signal according to the power spectrum obtained by calculating, and this noise level for controlling an energy proportion of noise filling to spectral band replication during decoding; wherein a zero bit encoding subband refers to an encoding subband of which allocated bit number is zero. The present invention can well reconstruct the uncoded frequency domain coefficients.

摘要翻译： 本发明涉及一种用于音频编码和解码的方法和系统，以及用于估计噪声电平的方法，以及本发明的用于估计噪声电平的方法，该方法和系统包括：根据以下方式估计待编码的音频信号的功率谱： 要编码的音频信号的频域系数; 以及根据通过计算得到的功率谱估计零比特编码子带音频信号的噪声电平，并且该噪声电平用于在解码期间控制噪声填充到频谱带复制的能量比例; 其中零比特编码子带是指分配的比特数为零的编码子带。 本发明可以很好地重构未编码的频域系数。

公开(公告)号：US08731949B2

公开(公告)日：2014-05-20

申请号：US13173367

申请日：2011-06-30

申请人： Dongping Jiang ,  Hao Yuan ,  Ke Peng ,  Guoming Chen ,  Jiali Li

发明人： Dongping Jiang ,  Hao Yuan ,  Ke Peng ,  Guoming Chen ,  Jiali Li

IPC分类号： G10L19/00

CPC分类号： G10L21/038 ,  G10L19/0204 ,  G10L19/0212 ,  G10L19/028 ,  H03M7/3082 ,  H03M7/4037

摘要： The present invention relates to a method and system for audio encoding and decoding and a method for estimating a noise level, and the method for estimating a noise level in the present invention comprises: estimating a power spectrum of an audio signal to be encoded according to a frequency domain coefficient of the audio signal to be encoded; and estimating a noise level of a zero bit encoding subband audio signal according to the power spectrum obtained by calculating, and this noise level for controlling an energy proportion of noise filling to spectral band replication during decoding; wherein a zero bit encoding subband refers to an encoding subband of which allocated bit number is zero. The present invention can well reconstruct the uncoded frequency domain coefficients.

摘要翻译： 本发明涉及一种用于音频编码和解码的方法和系统，以及用于估计噪声电平的方法，以及本发明的用于估计噪声电平的方法，该方法和系统包括：根据以下方式估计待编码的音频信号的功率谱： 要编码的音频信号的频域系数; 以及根据通过计算得到的功率谱估计零比特编码子带音频信号的噪声电平，并且该噪声电平用于在解码期间控制噪声填充到频谱带复制的能量比例; 其中零比特编码子带是指分配的比特数为零的编码子带。 本发明可以很好地重构未编码的频域系数。

公开(公告)号：US20120323582A1

公开(公告)日：2012-12-20

申请号：US13580855

申请日：2011-01-12

申请人： Ke Peng ,  Guoming Chen ,  Hao Yuan ,  Dongping Jiang ,  Jiali Li

发明人： Ke Peng ,  Guoming Chen ,  Hao Yuan ,  Dongping Jiang ,  Jiali Li

IPC分类号： G10L21/00

CPC分类号： G10L19/24 ,  G10L19/025

摘要： Hierarchical audio coding and decoding method and system and hierarchical audio coding and decoding method for transient signals are provided. In the present invention, by introducing a processing method for transient signal frames in the hierarchical audio coding and decoding methods, a segmented time-frequency transform is performed on the transient signal frames, and then the frequency-domain coefficients obtained by transformation are rearranged respectively within the core layer and within the extended layer, so as to perform the same subsequent coding processes, such as bit allocation, frequency-domain coefficient coding, etc., as those on the steady-state signal frames, thus enhancing the coding efficiency of the transient signal frames and improving the quality of the hierarchical audio coding and decoding.

摘要翻译： 提供了分层音频编码和解码方法以及用于瞬态信号的系统和分层音频编码和解码方法。 在本发明中，通过在分层音频编码和解码方法中引入用于瞬态信号帧的处理方法，对瞬态信号帧执行分段时间频率变换，然后分别重新分配由变换获得的频域系数 在核心层内和扩展层内，进行与稳态信号帧相同的随后的编码处理，如比特分配，频域系数编码等，从而提高编码效率 瞬态信号帧和提高分层音频编码和解码的质量。