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公开(公告)号：US12080303B2
公开(公告)日：2024-09-03
申请号：US18514393
申请日：2023-11-20
IPC分类号： G10L19/025 , G10L19/00 , G10L19/008 , G10L19/02 , G10L19/032 , G10L19/16 , H03H17/02 , H04B1/66 , H04B3/20 , H04B3/21 , H04L65/70 , H04L65/75 , H04N19/44 , H04N19/625 , H04N21/233
CPC分类号： G10L19/025 , G10L19/0017 , G10L19/008 , G10L19/0204 , G10L19/032 , G10L19/167 , H03H17/0272 , H04B1/667 , H04B3/20 , H04B3/21 , H04L65/70 , H04L65/75 , H04N19/45 , H04N19/625 , H04N21/233 , G10L19/0212
摘要： An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events.
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公开(公告)号：US20240087583A1
公开(公告)日：2024-03-14
申请号：US18514393
申请日：2023-11-20
IPC分类号： G10L19/025 , G10L19/00 , G10L19/008 , G10L19/02 , G10L19/032 , G10L19/16 , H03H17/02 , H04B1/66 , H04B3/20 , H04B3/21 , H04L65/70 , H04L65/75 , H04N19/44 , H04N19/625 , H04N21/233
CPC分类号： G10L19/025 , G10L19/0017 , G10L19/008 , G10L19/0204 , G10L19/032 , G10L19/167 , H03H17/0272 , H04B1/667 , H04B3/20 , H04B3/21 , H04L65/70 , H04L65/75 , H04N19/45 , H04N19/625 , H04N21/233 , G10L19/0212
摘要： An encoder operable to filter audio signals into a plurality of frequency band components, generate quantized digital components for each band, identify a potential for pre-echo events within the generated quantized digital components, generate an approximate signal by decoding the quantized digital components using inverse pulse code modulation, generate an error signal by comparing the approximate signal with the sampled audio signal, and process the error signal and quantized digital components. The encoder operable to process the error signal by processing delayed audio signals and Q band values, determining the potential for pre-echo events from the Q band values, and determining scale factors and MDCT block sizes for the potential for pre-echo events. The encoder operable to transform the error signal into high resolution frequency components using the MDCT block sizes, quantize the scale factors and frequency components, and encode the quantized lines, block sizes, and quantized scale factors for inclusion in the bitstream.
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公开(公告)号：US11830507B2
公开(公告)日：2023-11-28
申请号：US17270035
申请日：2019-08-21
发明人： Arijit Biswas , Harald Mundt
IPC分类号： G10L19/025 , G10L19/00 , G10L19/16 , G10L21/0316 , G10L21/04 , H03M7/50 , H03M7/30
CPC分类号： G10L19/025 , G10L19/00 , G10L19/167 , G10L21/0316 , G10L21/04 , H03M7/50 , H03M7/3059
摘要： Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A method of processing an audio signal includes the following operations. A system receives an audio signal. The system determines that a first frame of the audio signal includes a sparse transient signal. The system determines that a second frame of the audio signal includes a dense transient signal. The system compresses/expands (compands) the audio signal using a companding rule that applies a first companding exponent to the first frame of the audio signal and applies a second companding exponent to the second frame of the audio signal, each companding exponent being used to derive a respective degree of dynamic range compression and expansion for a corresponding frame. The system then provides the companded audio signal to a downstream device.
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公开(公告)号：US11682408B2
公开(公告)日：2023-06-20
申请号：US16995581
申请日：2020-08-17
发明人： Christian Helmrich , Jérémie Lecomte , Goran Markovic , Markus Schnell , Bernd Edler , Stefan Reuschl
IPC分类号： G10L19/00 , G10L19/025 , G10L19/022 , G10L19/02 , H04N19/172 , H04N19/176 , H04N19/44
CPC分类号： G10L19/025 , G10L19/022 , G10L19/0212 , H04N19/172 , H04N19/176 , H04N19/44
摘要： An apparatus for generating an encoded signal includes: a window sequence controller for generating a window sequence information for windowing an audio or image signal, the window sequence information indicating a first window for generating a first frame of spectral values, a second window function and at least one third window function for generating a second frame of spectral values, wherein the first window function, the second window function and the one or more third window functions overlap within a multi-overlap region; a preprocessor for windowing a second block of samples corresponding to the second window function and the at least one third window functions using an auxiliary window function to acquire a second block of windowed samples, a spectrum converter for applying an aliasing-introducing transform; and a processor for processing the first frame and the second frame to acquire encoded frames of the audio or image signal.
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公开(公告)号：US11581003B2
公开(公告)日：2023-02-14
申请号：US16885109
申请日：2020-05-27
IPC分类号： G10L19/00 , G10L19/26 , G10L19/025 , G10L19/028 , G10L19/12 , G10L19/22 , G10L25/21 , G10L25/90
摘要： The coding efficiency of an audio codec using a controllable—switchable or even adjustable—harmonic filter tool is improved by performing the harmonicity-dependent controlling of this tool using a temporal structure measure in addition to a measure of harmonicity in order to control the harmonic filter tool. In particular, the temporal structure of the audio signal is evaluated in a manner which depends on the pitch. This enables to achieve a situation-adapted control of the harmonic filter tool so that in situations where a control made solely based on the measure of harmonicity would decide against or reduce the usage of this tool, although using the harmonic filter tool would, in that situation, increase the coding efficiency, the harmonic filter tool is applied, while in other situations where the harmonic filter tool may be inefficient or even destructive, the control reduces the appliance of the harmonic filter tool appropriately.
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公开(公告)号：US11482233B2
公开(公告)日：2022-10-25
申请号：US16955063
申请日：2018-12-19
发明人： Rajat Kumar , Ramesh Katuri , Saketh Sathuvalli , Reshma Rai
IPC分类号： G10L19/008 , G10L19/06 , G10L19/16 , G10L19/025
摘要： The present disclosure relates to an apparatus for decoding an encoded Unified Audio and Speech stream. The apparatus comprises a core decoder for decoding the encoded Unified Audio and Speech stream. The core decoder includes an upmixing unit adapted to perform mono to stereo upmixing. The upmixing unit includes a decorrelator unit D adapted to apply a decorrelation filter to an input signal. The decorrelator unit is adapted to determine filter coefficients for the decorrelation filter by referring to pre-computed values. The present disclosure further relates to a an apparatus for encoding a Unified Audio and Speech stream, as well as to corresponding methods and storage media.
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公开(公告)号：US11423916B2
公开(公告)日：2022-08-23
申请号：US16900950
申请日：2020-06-14
IPC分类号： G10L19/02 , G10L25/18 , G10L25/48 , H03H17/02 , G10L19/00 , G10L19/12 , G10L19/26 , G10L25/21 , G10L19/025 , G10L19/083 , G10L25/12
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：US11355133B2
公开(公告)日：2022-06-07
申请号：US16917171
申请日：2020-06-30
发明人： Lars Villemoes
IPC分类号： G10L19/028 , G10L21/038 , G10L21/04 , G10L19/025 , G10L19/26 , H03G3/30 , H03G3/00 , G10L19/02
摘要： The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency QΩ+rΩ0 is generated on the basis of existing components at Ω and Ω+Ω0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank, a subband processing unit configurable by control data and a synthesis filter bank.
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公开(公告)号：US11308969B2
公开(公告)日：2022-04-19
申请号：US17063137
申请日：2020-10-05
发明人： Mark F. Davis
IPC分类号： G10L19/00 , G10L19/06 , G10L19/008 , G10L19/02 , G10L19/005 , G10L19/018 , G10L19/025 , G10L19/26 , H04S3/00
摘要： A method performed in an audio decoder for decoding M encoded audio channels representing N audio channels is disclosed. The method includes receiving a bitstream containing the M encoded audio channels and a set of spatial parameters, decoding the M encoded audio channels, and extracting the set of spatial parameters from the bitstream. The method also includes analyzing the M audio channels to detect a location of a transient, decorrelating the M audio channels, and deriving N audio channels from the M audio channels and the set of spatial parameters. A first decorrelation technique is applied to a first subset of each audio channel and a second decorrelation technique is applied to a second subset of each audio channel. The first decorrelation technique represents a first mode of operation of a decorrelator, and the second decorrelation technique represents a second mode of operation of the decorrelator.
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公开(公告)号：US11257505B2
公开(公告)日：2022-02-22
申请号：US17094791
申请日：2020-11-10
发明人： Sascha Disch , Frederik Nagel , Ralf Geiger , Balaji Nagendran Thoshkahna , Konstantin Schmidt , Stefan Bayer , Christian Neukam , Bernd Edler , Christian Helmrich
IPC分类号： G10L19/00 , G10L19/008 , G10L21/0388 , G10L19/025 , G10L19/03 , G10L19/02 , G10L19/022 , G10L19/032 , G10L19/06 , G10L25/06 , H04S1/00
摘要： An apparatus for generating a decoded two-channel signal includes: an audio processor for decoding an encoded two-channel signal to obtain a first set of first spectral portions; a parametric decoder for providing parametric data for a second set of second spectral portions and a two-channel identification identifying either a first or a second different two-channel representation for the second spectral portions; and a frequency regenerator for regenerating a second spectral portion depending on a first spectral portion of the first set of first spectral portions, the parametric data for the second portion and the two-channel identification for the second portion.
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