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公开(公告)号：US20170238112A1
公开(公告)日：2017-08-17
申请号：US15498376
申请日：2017-04-26
IPC分类号： H04S5/00 , G10L19/16 , G10L19/02 , G10L19/008
CPC分类号： H04R5/00 , G10L19/008 , G10L19/0204 , G10L19/032 , G10L19/167 , G10L19/26 , H04S3/02 , H04S5/00 , H04S2400/01 , H04S2400/03
摘要： A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.
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公开(公告)号：US20170229129A1
公开(公告)日：2017-08-10
申请号：US15498401
申请日：2017-04-26
IPC分类号： G10L19/008 , H04S3/02 , G10L19/02 , G10L19/26 , G10L19/032
CPC分类号： H04R5/00 , G10L19/008 , G10L19/0204 , G10L19/032 , G10L19/167 , G10L19/26 , H04S3/02 , H04S5/00 , H04S2400/01 , H04S2400/03
摘要： A method performed by an audio decoder for reconstructing N audio channels from an audio signal containing M audio channels is disclosed. The method includes receiving a bitstream containing an encoded audio signal having M audio channels and a set of spatial parameters, the set of spatial parameters including an inter-channel intensity difference parameter and an inter-channel coherence parameter. The encoded audio bitstream is then decoded to obtain a decoded frequency domain representation of the M audio channels, and at least a portion of the frequency domain representation is decorrelated with an all-pass filter having a fractional delay. The all-pass filter is attenuated at locations of a transient. A matrixed version of the decorrelated signals are summed with a matrixed version of the decoded frequency domain representation to obtain N audio signals that collectively having N audio channels where M is less than N.
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公开(公告)号：US20170133025A1
公开(公告)日：2017-05-11
申请号：US15410377
申请日：2017-01-19
CPC分类号： G10L19/06 , G10L19/008 , G10L19/02 , G10L19/0204 , G10L19/0212 , G10L19/167 , G10L19/265 , G10L25/06 , H04S1/007 , H04S2400/03 , H04S2420/03
摘要： The present disclosure provides methods, devices and computer program products for encoding and decoding a stereo audio signal based on an input signal. According to the disclosure, a hybrid approach of using both parametric stereo coding and a discrete representation of the stereo audio signal is used which may improve the quality of the encoded and decoded audio for certain bitrates.
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44.发明申请公开(公告)号：US20170110136A1
公开(公告)日：2017-04-20
申请号：US15392545
申请日：2016-12-28
IPC分类号： G10L19/083 , G10L19/025 , G10L25/12 , G10L19/26 , G10L19/02
CPC分类号： G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
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公开(公告)号：US20160217797A1
公开(公告)日：2016-07-28
申请号：US14916415
申请日：2014-09-08
IPC分类号： G10L19/008
CPC分类号： G10L19/008
摘要： Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. The results of the first and second stereo decoding components are crosswise coupled to a third and a fourth stereo decoding component which each performs stereo decoding on one channel resulting from the first stereo decoding component, and one channel resulting from the second stereo decoding component.
摘要翻译： 公开了用于编码具有至少四个信道的音频系统的信道的编码和解码装置。 解码装置具有使第一对输入通道进行第一立体声解码的第一立体声解码部件和使第二对输入通道进行第二立体声解码的第二立体声解码部件。 第一和第二立体声解码部件的结果被交叉耦合到第三和第四立体声解码部件，每个立体声解码部件在由第一立体声解码部件产生的一个通道上执行立体声解码，以及由第二立体声解码部件产生的一个通道。
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公开(公告)号：US20160042742A1
公开(公告)日：2016-02-11
申请号：US14781891
申请日：2014-04-04
IPC分类号： G10L19/02 , G10L21/0388
CPC分类号： G10L19/0208 , G10L19/02 , G10L19/0212 , G10L19/26 , G10L21/038 , G10L21/0388
摘要： There is provided methods and apparatuses for decoding and encoding of audio signals. In particular, a method for decoding includes receiving a waveform-coded signal having a spectral content corresponding to a subset of the frequency range above a cross-over frequency. The waveform-coded signal is interleaved with a parametric high frequency reconstruction of the audio signal above the cross-over frequency. In this way an improved reconstruction of the high frequency bands of the audio signal is achieved.
摘要翻译： 提供了用于对音频信号进行解码和编码的方法和装置。 特别地，一种解码方法包括：接收波形编码信号，该波形编码信号具有对应于高于交叉频率的频率范围子集的频谱内容。 波形编码信号与高于交叉频率的音频信号的参数高频重构进行交织。 以这种方式，实现了音频信号的高频带的改进的重建。
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公开(公告)号：US20240062765A1
公开(公告)日：2024-02-22
申请号：US18459907
申请日：2023-09-01
IPC分类号： G10L19/008
CPC分类号： G10L19/008
摘要： Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. The results of the first and second stereo decoding components are crosswise coupled to a third and a fourth stereo decoding component which each performs stereo decoding on one channel resulting from the first stereo decoding component, and one channel resulting from the second stereo decoding component.
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公开(公告)号：US20230197102A1
公开(公告)日：2023-06-22
申请号：US18113397
申请日：2023-02-23
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
CPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/008
摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.
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公开(公告)号：US20230197101A1
公开(公告)日：2023-06-22
申请号：US18113391
申请日：2023-02-23
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
CPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/008
摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.
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50.发明申请公开(公告)号：US20230059049A1
公开(公告)日：2023-02-23
申请号：US17973397
申请日：2022-10-25
摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag.
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