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61. 发明申请

US20150269948A1 Advanced Stereo Coding Based on a Combination of Adaptively Selectable Left/Right or Mid/Side Stereo Coding and of Parametric Stereo Coding 有权
标题翻译：基于自适应选择的左/右或中/侧立体声编码和参数立体声编码的组合的高级立体声编码
公开(公告)号：US20150269948A1
公开(公告)日：2015-09-24
申请号：US14734088
申请日：2015-06-09
申请人： Dolby International AB
发明人： Heiko Purnhagen , Pontus Carlsson , Kristofer Kjoerling
IPC分类号： G10L19/002
CPC分类号： G10L19/002 , G10L19/008 , G10L19/18 , H04S3/02 , H04S5/00 , H04S5/005 , H04S5/02 , H04S2400/01 , H04S2400/03 , H04S2420/03
摘要： The application relates to audio encoder and decoder systems. An embodiment of the encoder system comprises a downmix stage for generating a downmix signal and a residual signal based on a stereo signal. In addition, the encoder system comprises a parameter determining stage for determining parametric stereo parameters such as an inter-channel intensity difference and an inter-channel cross-correlation. Preferably, the parametric stereo parameters are time- and frequency-variant. Moreover, the encoder system comprises a transform stage. The transform to stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding is selectable. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-variant.
摘要翻译：该应用涉及音频编码器和解码器系统。编码器系统的实施例包括用于产生下混信号的下混级和基于立体声信号的残留信号。此外，编码器系统包括用于确定诸如信道间强度差和信道间互相关的参数立体参数的参数确定级。优选地，参数立体声参数是时间和频率变化的。此外，编码器系统包括变换级。通过基于下混合信号和残留信号进行变换，对阶段的变换生成伪左/右立体声信号。伪立体声信号由感知立体声编码器处理。对于立体声编码，可以选择左/右编码或中/侧编码。优选地，左/右立体声编码和中/立体声编码之间的选择是时间和频率变化的。

62. 发明授权

US11830509B2 Integration of high frequency reconstruction techniques with reduced post-processing delay 有权
公开(公告)号：US11830509B2
公开(公告)日：2023-11-28
申请号：US18178405
申请日：2023-03-03
申请人： Dolby International AB
发明人： Kristofer Kjoerling , Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/18 , G10L21/038
CPC分类号： G10L19/18 , G10L21/038
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.

63. 发明授权

US11705139B2 Efficient coding of audio scenes comprising audio objects 有权
公开(公告)号：US11705139B2
公开(公告)日：2023-07-18
申请号：US17687956
申请日：2022-03-07
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko Purnhagen , Kristofer Kjoerling , Toni Hirvonen , Lars Villemoes , Dirk Jeroen Breebaart
IPC分类号： G10L19/008 , H04S3/00
CPC分类号： G10L19/008 , H04S3/008 , H04S2400/01 , H04S2400/03 , H04S2400/13 , H04S2400/15 , H04S2420/03 , H04S2420/07
摘要： There is provided encoding and decoding methods for encoding and decoding of object based audio. An exemplary encoding method includes inter alia calculating M downmix signals by forming combinations of N audio objects, wherein M≤N, and calculating parameters which allow reconstruction of a set of audio objects formed on basis of the N audio objects from the M downmix signals. The calculation of the M downmix signals is made according to a criterion which is independent of any loudspeaker configuration.

64. 发明授权

US11676622B2 Method, apparatus and systems for audio decoding and encoding 有权
公开(公告)号：US11676622B2
公开(公告)日：2023-06-13
申请号：US17343761
申请日：2021-06-10
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko Purnhagen , Kristofer Kjoerling , Alexander Stahlmann , Jens Popp , Karl Jonas Roeden
IPC分类号： G10L21/00 , G10L21/055 , G10L19/022 , H04N21/2368 , H04N21/439 , G10L19/16 , H04N21/43 , G10L19/22
CPC分类号： G10L21/055 , G10L19/022 , G10L19/167 , H04N21/2368 , H04N21/4302 , H04N21/4398 , G10L19/22
摘要： An audio processing system (100) accepts an audio bitstream having one of a plurality of predefined audio frame rates. The system comprises a front-end component (110), which receives a variable number of quantized spectral components, corresponding to one audio frame in any of the predefined audio frame rates, and performs an inverse quantization according to predetermined, frequency-dependent quantization levels. The front-end component may be agnostic of the audio frame rate. The audio processing system further comprises a frequency-domain processing stage (120) and a sample rate converter (130), which provide a reconstructed audio signal sampled at a target sampling frequency independent of the audio frame rate. By its frame-rate adaptability, the system can be configured to operate frame-synchronously in parallel with a video processing system that accepts plural video frame rates.

65. 发明授权

US11562759B2 Integration of high frequency reconstruction techniques with reduced post-processing delay 有权
公开(公告)号：US11562759B2
公开(公告)日：2023-01-24
申请号：US17050664
申请日：2019-04-25
申请人： Dolby International AB
发明人： Kristofer Kjoerling , Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/18 , G10L21/038
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.

66. 发明授权

US11315576B2 Selectable linear predictive or transform coding modes with advanced stereo coding 有权
公开(公告)号：US11315576B2
公开(公告)日：2022-04-26
申请号：US16434059
申请日：2019-06-06
申请人： Dolby International AB
发明人： Heiko Purnhagen , Pontus Carlsson , Kristofer Kjoerling
IPC分类号： G10L19/002 , H04S5/02 , H04S5/00 , H04S3/02 , G10L19/008 , G10L19/18
摘要： Methods and systems for advanced stereo processing of an audio signal are disclosed. The methods and systems include selecting a coding mode of either transform coding or linear predictive coding and performing advanced stereo processing when in the selected coding mode. Both encoding and decoding operations are provided.

67. 发明授权

US11270709B2 Efficient coding of audio scenes comprising audio objects 有权
公开(公告)号：US11270709B2
公开(公告)日：2022-03-08
申请号：US15821000
申请日：2017-11-22
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko Purnhagen , Kristofer Kjoerling , Toni Hirvonen , Lars Villemoes , Dirk Jeroen Breebaart
IPC分类号： G10L19/008 , H04S3/00
摘要： There is provided encoding and decoding methods for encoding and decoding of object based audio. An exemplary encoding method includes inter alia calculating M downmix signals by forming combinations of N audio objects, wherein M≤N, and calculating parameters which allow reconstruction of a set of audio objects formed on basis of the N audio objects from the M downmix signals. The calculation of the M downmix signals is made according to a criterion which is independent of any loudspeaker configuration.

68. 发明授权

US11145318B2 Audio encoder and decoder for interleaved waveform coding 有权
公开(公告)号：US11145318B2
公开(公告)日：2021-10-12
申请号：US16169964
申请日：2018-10-24
申请人： DOLBY INTERNATIONAL AB
发明人： Kristofer Kjoerling , Robin Thesing , Harald Mundt , Heiko Purnhagen , Karl Jonas Roeden
IPC分类号： G10L19/00 , G10L19/02 , G10L21/038 , G10L21/0388 , G10L19/26
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.

69. 发明授权

US11133013B2 Audio encoder with selectable L/R or M/S coding 有权
公开(公告)号：US11133013B2
公开(公告)日：2021-09-28
申请号：US16545166
申请日：2019-08-20
申请人： Dolby International AB
发明人： Heiko Purnhagen , Pontus Carlsson , Kristofer Kjoerling
IPC分类号： G10L19/002 , H04S5/00 , H04S3/02 , G10L19/008 , H04S5/02 , G10L19/18
摘要： Methods and systems encoding a stereo audio signal having a left channel and a right channel are disclosed. The system includes a downmixer for generating a downmix signal and a residual signal from the stereo audio signal in selected frequency bands representing only part of a used audio frequency range of the stereo audio signal, and a decision module for selecting, in a time variant manner, either left/right perceptual encoding or mid/side perceptual encoding. The system also includes a parameter estimator for estimating stereo parameters for reconstructing a stereo image of a portion of the stereo audio signal, and a perceptual encoder for performing either left/right perceptual encoding or mid/side perceptual encoding based on the selecting to generate an encoded output signal. Finally, the system includes a bitstream generator for creating a bitstream signal comprising the encoded output signal.

70. 发明授权

US11031019B2 Processing of audio signals during high frequency reconstruction 有权
公开(公告)号：US11031019B2
公开(公告)日：2021-06-08
申请号：US16367099
申请日：2019-03-27
申请人： Dolby International AB
发明人： Kristofer Kjoerling
IPC分类号： G10L19/00 , G10L19/02 , G10L21/038
摘要： The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.

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