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公开(公告)号：US12020721B2
公开(公告)日：2024-06-25
申请号：US17226300
申请日：2021-04-09
IPC分类号： G10L21/04 , G10L19/022 , G10L25/06
CPC分类号： G10L21/04 , G10L19/022 , G10L25/06
摘要： A time scaler for providing a time scaled version of an input audio signal is configured to compute or estimate a quality of a time scaled version of the input audio signal obtainable by a time scaling of the input audio signal. The time scaler is configured to perform the time scaling of the input audio signal in dependence on the computation or estimation of the quality of the time scaled version of the input audio signal obtainable by the time scaling. An audio decoder has such a time scaler.
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公开(公告)号：US10984817B2
公开(公告)日：2021-04-20
申请号：US16243006
申请日：2019-01-08
IPC分类号： G10L21/04 , G10L19/022 , G10L25/06
摘要： A time scaler for providing a time scaled version of an input audio signal is configured to compute or estimate a quality of a time scaled version of the input audio signal obtainable by a time scaling of the input audio signal. The time scaler is configured to perform the time scaling of the input audio signal in dependence on the computation or estimation of the quality of the time scaled version of the input audio signal obtainable by the time scaling. An audio decoder has such a time scaler.
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公开(公告)号：US10854211B2
公开(公告)日：2020-12-01
申请号：US16375437
申请日：2019-04-04
发明人： Guillaume Fuchs , Emmanuel Ravelli , Markus Multrus , Markus Schnell , Stefan Doehla , Martin Dietz , Goran Markovic , Eleni Fotopoulou , Stefan Bayer , Wolfgang Jaegers
IPC分类号： G10L19/008 , G10L19/022 , G10L19/02 , G10L19/04 , G10L25/18 , H04S3/00
摘要： An apparatus for encoding a multi-channel signal including at least two channels includes a time-spectral converter for converting sequences of blocks of sampling values of the at least two channels into a frequency domain representation having sequences of blocks of spectral values for the at least two channels; a multi-channel processor for applying a joint multi-channel processing to the sequences of blocks of spectral values to obtain at least one result sequence of blocks of spectral values including information related to the at least two channels; a spectral-time converter for converting the result sequence of blocks of spectral values into a time domain representation including an output sequence of blocks of sampling values; and a core encoder for encoding the output sequence of blocks of sampling values to obtain an encoded multi-channel signal.
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公开(公告)号：US10783898B2
公开(公告)日：2020-09-22
申请号：US15430178
申请日：2017-02-10
发明人： Stefan Doehla , Guillaume Fuchs , Bernhard Grill , Markus Multrus , Grzegorz Pietrzyk , Emmanuel Ravelli , Markus Schnell
摘要： Audio decoder device for decoding a bitstream, the audio decoder device including: a predictive decoder for producing a decoded audio frame from the bitstream, wherein the predictive decoder includes a parameter decoder for producing one or more audio parameters for the decoded audio frame from the bitstream and wherein the predictive decoder includes a synthesis filter device for producing the decoded audio frame by synthesizing the one or more audio parameters for the decoded audio frame; a memory device including one or more memories, wherein each of the memories is configured to store a memory state for the decoded audio frame, wherein the memory state for the decoded audio frame of the one or more memories is used by the synthesis filter device for synthesizing the one or more audio parameters for the decoded audio frame; and a memory state resampling device configured to determine the memory state for synthesizing the one or more audio parameters for the decoded audio frame, which has a sampling rate, for one or more of the memories by resampling a preceding memory state for synthesizing one or more audio parameters for a preceding decoded audio frame, which has a preceding sampling rate being different from the sampling rate of the decoded audio frame, for one or more of the memories and to store the memory state for synthesizing of the one or more audio parameters for the decoded audio frame for one or more of the memories into the respective memory.
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公开(公告)号：US10224052B2
公开(公告)日：2019-03-05
申请号：US15644040
申请日：2017-07-07
IPC分类号： G10L19/22 , G10L19/032 , G10L19/09 , G10L19/12 , G10L19/26 , G10L19/02 , G10L19/08 , G10L19/00
摘要： An apparatus for selecting one of a first encoding algorithm and a second encoding algorithm includes a filter configured to receive the audio signal, to reduce the amplitude of harmonics in the audio signal and to output a filtered version of the audio signal. First and second estimators are provided for estimating first and second quality measures in the form of SNRs of segmented SNRs associated with the first and second encoding algorithms without actually encoding and decoding the portion of the audio signal using the first and second encoding algorithms. A controller is provided for selecting the first encoding algorithm or the second encoding algorithm based on a comparison between the first quality measure and the second quality measure.
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公开(公告)号：US10083706B2
公开(公告)日：2018-09-25
申请号：US15411662
申请日：2017-01-20
IPC分类号： G10L19/00 , G10L19/26 , G10L25/90 , G10L25/21 , G10L19/028 , G10L19/025 , G10L19/22 , G10L19/12
CPC分类号： G10L19/265 , G10L19/025 , G10L19/028 , G10L19/12 , G10L19/22 , G10L19/26 , 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：US11887609B2
公开(公告)日：2024-01-30
申请号：US17751303
申请日：2022-05-23
发明人： Stefan Bayer , Eleni Fotopoulou , Markus Multrus , Guillaume Fuchs , Emmanuel Ravelli , Markus Schnell , Stefan Doehla , Wolfgang Jaegers , Martin Dietz , Goran Markovic
IPC分类号： G10L19/008 , G10L19/022 , G10L19/02 , G10L19/04 , G10L25/18 , H04S3/00
CPC分类号： G10L19/008 , G10L19/02 , G10L19/022 , G10L19/04 , G10L25/18 , H04S3/008 , H04S2400/01 , H04S2400/03 , H04S2420/03
摘要： An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, includes: a calculator for calculating a cross-correlation spectrum for a time block from the first channel signal in the time block and the second channel signal in the time block; a spectral characteristic estimator for estimating a characteristic of a spectrum of the first channel signal or the second channel signal for the time block; a smoothing filter for smoothing the cross-correlation spectrum over time using the spectral characteristic to obtain a smoothed cross-correlation spectrum; and a processor for processing the smoothed cross-correlation spectrum to obtain the inter-channel time difference.
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公开(公告)号：US11854561B2
公开(公告)日：2023-12-26
申请号：US17992496
申请日：2022-11-22
CPC分类号： G10L19/087 , G10L19/06 , G10L19/16 , G10L19/26 , G10L19/265 , G10L19/0212 , G10L19/08
摘要： The invention provides an audio encoder including a combination of a linear predictive coding filter having a plurality of linear predictive coding coefficients and a time-frequency converter, wherein the combination is configured to filter and to convert a frame of the audio signal into a frequency domain in order to output a spectrum based on the frame and on the linear predictive coding coefficients; a low frequency emphasizer configured to calculate a processed spectrum based on the spectrum, wherein spectral lines of the processed spectrum representing a lower frequency than a reference spectral line are emphasized; and a control device configured to control the calculation of the processed spectrum by the low frequency emphasizer depending on the linear predictive coding coefficients of the linear predictive coding filter.
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公开(公告)号：US11842742B2
公开(公告)日：2023-12-12
申请号：US16041691
申请日：2018-07-20
发明人： Emmanuel Ravelli , Markus Schnell , Stefan Doehla , Wolfgang Jaegers , Martin Dietz , Christian Helmrich , Goran Markovic , Eleni Fotopoulou , Markus Multrus , Stefan Bayer , Guillaume Fuchs , Juergen Herre
IPC分类号： G10L19/008 , G10L19/03 , G10L19/032 , G10L19/02 , G10L19/22
CPC分类号： G10L19/008 , G10L19/03 , G10L19/032 , G10L19/0204 , G10L19/0212 , G10L19/22
摘要： An apparatus for encoding a first channel and a second channel of an audio input signal including two or more channels to obtain an encoded audio signal according to an embodiment includes a normalizer configured to determine a normalization value for the audio input signal depending on the first channel of the audio input signal and depending on the second channel of the audio input signal. Moreover, the apparatus includes an encoding unit configured to generate a processed audio signal having a first channel and a second channel. The encoding unit is configured to encode the processed audio signal to obtain the encoded audio signal.
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公开(公告)号：US11580997B2
公开(公告)日：2023-02-14
申请号：US16899382
申请日：2020-06-11
发明人： Stefan Reuschl , Stefan Doehla , Jérémie Lecomte , Manuel Jander
IPC分类号： H04J3/06 , G10L19/022 , G10L19/012 , G10L19/04 , G10L21/04
摘要： A jitter buffer control for controlling a provision of a decoded audio content on the basis of an input audio content is configured to select a frame-based time scaling or a sample-based time scaling in a signal-adaptive manner. An audio decoder uses such a jitter buffer control.
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