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公开(公告)号：US11967327B2
公开(公告)日：2024-04-23
申请号：US17618676
申请日：2020-06-04
IPC分类号： G10L19/005 , G10L19/022 , G10L19/06
CPC分类号： G10L19/005 , G10L19/022 , G10L19/06
摘要： A method and a decoder device of generating a concealment audio subframe of an audio signal are provided. The method comprises generating frequency spectra on a subframe basis where consecutive subframes of the audio signal have a property that an applied window shape of first subframe of the consecutive subframes is a mirrored version or a time reversed version of a second subframe of the consecutive subframes. Peaks of a signal spectrum of a previously received audio signal are detected for a concealment subframe, and a phase of each of the peaks is estimated. A time reversed phase adjustment is derived based on the estimated phase and applied to the peaks of the signal spectrum to form time reversed phase adjusted peaks.
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2.发明授权公开(公告)号：US11380337B2
公开(公告)日：2022-07-05
申请号：US17066541
申请日：2020-10-09
IPC分类号： G10L19/008 , G10L19/26 , G10L21/0308
摘要： A method for increasing stability of an inter-channel time difference (ICTD) parameter in parametric audio coding, wherein a multi-channel audio input signal comprising at least two channels is received. The method comprises obtaining an ICTD estimate, ICTDest(m), for an audio frame m and a stability estimate of said ICTD estimate, and determining whether the obtained ICTD estimate, ICTDest(m), is valid. If the ICTDest(m) is not found valid, and a determined sufficient number of valid ICTD estimates have been found in preceding frames, a hang-over time is determined using the stability estimate and a previously obtained valid ICTD parameter, ICTD(m−1), is selected as an output parameter, ICTD(m), during the hang-over time. The output parameter, ICTD(m), is set to zero if valid ICTDest(m) is not found during the hang-over time.
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公开(公告)号：US20200005803A1
公开(公告)日：2020-01-02
申请号：US16565920
申请日：2019-09-10
发明人： Erik Norvell , Volodya Grancharov
IPC分类号： G10L19/038 , G10L19/02 , G10L21/0232 , G10L19/083 , G10L19/032
摘要： A gain adjustment apparatus for use in decoding of audio that has been encoded with separate gain and shape representations includes an accuracy meter configured to estimate an accuracy measure of the shape representation, and to determine a gain correction based on the estimated accuracy measure. An envelope adjuster further included in the apparatus is configured to adjust the gain representation based on the determined gain correction.
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公开(公告)号：US10460739B2
公开(公告)日：2019-10-29
申请号：US15668766
申请日：2017-08-04
发明人： Erik Norvell , Volodya Grancharov
IPC分类号： G10L19/02 , G10L19/032 , G10L19/038 , G10L19/083 , G10L21/0232
摘要： A gain adjustment apparatus for use in decoding of audio that has been encoded with separate gain and shape representations includes an accuracy meter configured to estimate an accuracy measure of the shape representation, and to determine a gain correction based on the estimated accuracy measure. An envelope adjuster further included in the apparatus is configured to adjust the gain representation based on the determined gain correction.
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公开(公告)号：US20180047404A1
公开(公告)日：2018-02-15
申请号：US15797725
申请日：2017-10-30
发明人： Erik Norvell , Stefan Bruhn
摘要： The invention relates to a codec and a signal classifier and methods therein for signal classification and selection of a coding mode based on audio signal characteristics. A method embodiment to be performed by a decoder comprises, for a frame m: determining a stability value D(m) based on a difference, in a transform domain, between a range of a spectral envelope of frame m and a corresponding range of a spectral envelope of an adjacent frame m−1. Each such range comprises a set of quantized spectral envelope values related to the energy in spectral bands of a segment of the audio signal. The method further comprises selecting a decoding mode, out of a plurality of decoding modes, based on the stability value D(m); and applying the selected decoding mode.
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公开(公告)号：US20170178660A1
公开(公告)日：2017-06-22
申请号：US15451551
申请日：2017-03-07
发明人： Erik Norvell , Volodya GRANCHAROV
摘要： The invention relates to a codec and a discriminator and methods therein for audio signal discrimination and coding. Embodiments of a method performed by an encoder comprises, for a segment of the audio signal: identifying a set of spectral peaks; determining a mean distance S between peaks in the set; and determining a ratio, PNR, between a peak envelope and a noise floor envelope. The method further comprises selecting a coding mode, out of a plurality of coding modes, based at least on the mean distance S and the ratio PNR; and applying the selected coding mode for coding of the segment of the audio signal.
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公开(公告)号：US11837242B2
公开(公告)日：2023-12-05
申请号：US17844803
申请日：2022-06-21
IPC分类号： G10L19/012 , G10L19/008 , G10L19/032 , G10L19/04 , G10L19/06 , G10L19/00 , H04W76/28
CPC分类号： G10L19/012 , G10L19/008 , G10L19/0017 , G10L19/032 , G10L19/04 , G10L19/06 , H04W76/28
摘要： A method and a transmitting node for supporting generation of comfort noise for at least two audio channels at a receiving node. The method is performed by a transmitting node. The method comprises determining spectral characteristics of audio signals on at least two input audio channels and determining a spatial coherence between the audio signals. The spatial coherence is associated with perceptual importance measures. A compressed representation of the spatial coherence is determined per frequency band by weighting the spatial coherence within each frequency band according to the perceptual importance measures. Information about the spectral characteristics and the compressed representation of the spatial coherence per frequency band is signaled to the receiving node for enabling the generation of the comfort noise at the receiving node.
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公开(公告)号：US20210287688A1
公开(公告)日：2021-09-16
申请号：US17331995
申请日：2021-05-27
发明人： Erik Norvell , Volodya Grancharov
IPC分类号： G10L19/038 , G10L19/02 , G10L21/0232 , G10L19/083 , G10L19/032
摘要： A gain adjustment apparatus for use in decoding of audio that has been encoded with separate gain and shape representations includes an accuracy meter configured to estimate an accuracy measure of the shape representation, and to determine a gain correction based on the estimated accuracy measure. An envelope adjuster further included in the apparatus is configured to adjust the gain representation based on the determined gain correction.
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9.发明授权公开(公告)号：US10832689B2
公开(公告)日：2020-11-10
申请号：US16082137
申请日：2017-03-08
IPC分类号： G10L19/008 , G10L21/0308 , G10L19/26
摘要： A method for increasing stability of an inter-channel time difference (ICTD) parameter in parametric audio coding, wherein a multi-channel audio input signal comprising at least two channels is received. The method comprises obtaining an ICTD estimate, ICTDest(m), for an audio frame m and a stability estimate of said ICTD estimate, and determining whether the obtained ICTD estimate, ICTDest(m), is valid. If the ICTDest(m) is not found valid, and a determined sufficient number of valid ICTD estimates have been found in preceding frames, a hang-over time is determined using the stability estimate and a previously obtained valid ICTD parameter, ICTD (m−1), is selected as an output parameter, ICTD (m), during the hang-over time. The output parameter, ICTD (m), is set to zero if valid ICTDest(m) is not found during the hang-over time.
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公开(公告)号：US10297264B2
公开(公告)日：2019-05-21
申请号：US16166976
申请日：2018-10-22
发明人： Erik Norvell , Stefan Bruhn
摘要： The invention relates to a codec and a signal classifier and methods therein for signal classification and selection of a coding mode based on audio signal characteristics. A method embodiment to be performed by a decoder comprises, for a frame m: determining a stability value D(m) based on a difference, in a transform domain, between a range of a spectral envelope of frame m and a corresponding range of a spectral envelope of an adjacent frame m−1. Each such range comprises a set of quantized spectral envelope values related to the energy in spectral bands of a segment of the audio signal. The method further comprises selecting a decoding mode, out of a plurality of decoding modes, based on the stability value D(m); and applying the selected decoding mode.
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