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1.发明授权Smooth configuration switching for multichannel audio rendering based on a variable number of received channels 有权基于可变数量的接收通道，进行多通道音频渲染的平滑配置切换公开(公告)号：US09552818B2
公开(公告)日：2017-01-24
申请号：US14406670
申请日：2013-06-14
IPC分类号： G10L19/00 , G10L19/008 , H04S3/00 , G10L19/18
CPC分类号： G10L19/008 , G10L19/0017 , G10L19/18 , H04S3/008 , H04S2400/03 , H04S2420/03
摘要： A decoding system reconstructs an n-channel audio signal on the basis of an input signal representing the audio signal, in different time frames, either by parametric coding or as n discretely coded channels. Parametric decoding uses a core signal and mixing parameters controlling a spatial synthesis stage, to which a downmix signal is supplied from a downmix stage. The downmix stage realizes a projection on the downmix signal based on an n-channel input signal, either a discretely coded signal or a core signal padded with neutral-valued channels. The padding may take place either on the decoding side (reduced parametric coding) or the encoding side. In an embodiment, an audio decoder (110) in the decoding system pads the core signal during an initial portion of each reduced parametrically coded time frame directly succeeding a discretely coded time frame and during a final portion of each reduced parametrically coded time frame directly preceding a discretely coded time frame.
摘要翻译： 解码系统通过参数编码或作为n个离散编码的信道，在不同的时间帧中，基于表示音频信号的输入信号来重构n信道音频信号。 参数解码使用核心信号和控制空间合成阶段的混合参数，下混合信号从下混合级提供给它。 下混合阶段基于n沟道输入信号，即离散编码信号或用中性值通道填充的核心信号，实现对下混合信号的投影。 填充可以在解码侧（缩减参数编码）或编码侧进行。 在一个实施例中，解码系统中的音频解码器（110）在直接在离散编码的时间帧之后的每个缩减的参数编码的时间帧的初始部分和在直接前进的每个缩减的参数编码的时间帧的最后部分期间， 离散编码的时间帧。
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2.发明授权公开(公告)号：US11782672B2
公开(公告)日：2023-10-10
申请号：US17386423
申请日：2021-07-27
摘要： Embodiments are directed to a method and system for receiving, in a bitstream, metadata associated with the audio data, and analyzing the metadata to determine whether a loudness parameter for a first group of audio playback devices are available in the bitstream. Responsive to determining that the parameters are present for the first group, the system uses the parameters and audio data to render audio. Responsive to determining that the loudness parameters are not present for the first group, the system analyzes one or more characteristics of the first group, and determines the parameter based on the one or more characteristics.
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公开(公告)号：US11676622B2
公开(公告)日：2023-06-13
申请号：US17343761
申请日：2021-06-10
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.
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公开(公告)号：US11145318B2
公开(公告)日：2021-10-12
申请号：US16169964
申请日：2018-10-24
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.
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公开(公告)号：US10438602B2
公开(公告)日：2019-10-08
申请号：US15641033
申请日：2017-07-03
IPC分类号： G10L19/00 , G10L21/00 , G10L19/20 , G10L19/008 , G10L25/18 , H04S3/00 , G10L19/02 , G10L19/16
摘要： A method for decoding an encoded audio bitstream in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal comprising spectral coefficients corresponding to frequencies up to a first cross-over frequency for a time frame and performing parametric decoding at a second cross-over frequency for the time frame to generate a reconstructed signal. The second cross-over frequency is above the first cross-over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method also includes extracting from the encoded audio bitstream a second waveform-coded signal comprising spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency for the time frame and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal for the time frame.
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6.发明授权公开(公告)号：US09799340B2
公开(公告)日：2017-10-24
申请号：US15458135
申请日：2017-03-14
IPC分类号： G10L19/008 , G10L19/26 , G10L21/038
CPC分类号： G10L19/008 , G10L19/265 , G10L21/038 , G10L25/21
摘要： The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
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公开(公告)号：US09728199B2
公开(公告)日：2017-08-08
申请号：US15227283
申请日：2016-08-03
IPC分类号： G10L19/00 , G10L21/00 , G10L19/20 , G10L19/008 , G10L25/18 , H04S3/00 , G10L19/02 , G10L19/16
CPC分类号： G10L19/20 , G10L19/008 , G10L19/0212 , G10L19/167 , G10L25/18 , H04S3/008 , H04S2400/03 , H04S2420/03
摘要： A method for decoding an encoded audio bitstream in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal including spectral coefficients corresponding to frequencies up to a first cross-over frequency and performing parametric decoding at a second cross-over frequency to generate a reconstructed signal. The second cross-over frequency is above the first cross-over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method further includes extracting from the encoded audio bitstream a second waveform-coded signal including spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal. The interleaved signal is then combined with the first waveform-coded signal.
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公开(公告)号：US20170186436A1
公开(公告)日：2017-06-29
申请号：US15458143
申请日：2017-03-14
IPC分类号： G10L19/008 , G10L21/038 , G10L19/26
CPC分类号： G10L19/008 , G10L19/265 , G10L21/038 , G10L25/21
摘要： The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
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公开(公告)号：US20240153517A1
公开(公告)日：2024-05-09
申请号：US18504879
申请日：2023-11-08
CPC分类号： G10L19/20 , G10L19/008 , G10L19/0212 , G10L19/167 , G10L25/18 , H04S3/008 , H04S2400/03 , H04S2420/03
摘要： A method for decoding an encoded audio bitstream in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal comprising spectral coefficients corresponding to frequencies up to a first cross-over frequency for a time frame and performing parametric decoding at a second cross-over frequency for the time frame to generate a reconstructed signal. The second cross-over frequency is above the first cross-over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method also includes extracting from the encoded audio bitstream a second waveform-coded signal comprising spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency for the time frame and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal for the time frame.
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公开(公告)号：US11875805B2
公开(公告)日：2024-01-16
申请号：US17495184
申请日：2021-10-06
IPC分类号： G10L19/00 , G10L19/02 , G10L21/038 , G10L21/0388 , G10L19/26
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.
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