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公开(公告)号：US20190080704A1
公开(公告)日：2019-03-14
申请号：US16115166
申请日：2018-08-28
Applicant: QUALCOMM Incorporated
IPC: G10L19/008 , G10L19/022 , G10L19/005 , H04S3/00
Abstract: A method for multi-channel audio or speech signal processing includes receiving a reference channel and a target channel, determining a variation between a first mismatch value and a second mismatch value, and comparing the variation with a first threshold that may have a pre-determined value or may be adjusted based on a frame type or a smoothing factor. The method also includes adjusting a set of target samples of the target channel based on the variation and based on the comparison to generate an adjusted set of target samples. Adjusting the set of target samples includes selecting one among a first interpolation and a second interpolation based on the variation. The method further includes generating at least one encoded channel based on a set of reference samples and the adjusted set of target samples. The method also includes transmitting the at least one encoded channel to a second device.
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公开(公告)号：US20190080703A1
公开(公告)日：2019-03-14
申请号：US16115129
申请日：2018-08-28
Applicant: QUALCOMM Incorporated
IPC: G10L19/008 , G10L19/022 , G10L19/005 , H04S3/00
Abstract: A method of coding for multi-channel audio signals includes estimating comparison values at an encoder indicative of an amount of temporal mismatch between a reference channel and a corresponding target channel. The method includes smoothing the comparison values to generate short-term and first long-term smoothed comparison values. The method includes calculating a cross-correlation value between the comparison values and the short-term smoothed comparison values. The method also includes adjusting the first long-term smoothed comparison values in response to comparing the cross-correlation value with a threshold. The method further includes estimating a tentative shift value and non-causally shifting the target channel by a non-causal shift value to generate an adjusted target channel. The non-causal shift value is based on the tentative shift value. The method further includes generating, based on reference channel and the adjusted target channel, at least one of a mid-band channel or a side-band channel.
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公开(公告)号：US20190035409A1
公开(公告)日：2019-01-31
申请号：US16152357
申请日：2018-10-04
Applicant: QUALCOMM Incorporated
IPC: G10L19/005 , G10L21/00 , G10L25/51 , G10L19/008 , G10L25/06
Abstract: A device includes an encoder configured to determine, during a first period, that a first audio signal is a leading signal and that a second audio signal is a lagging signal. The encoder is also configured to generate a first frame of at least one encoded signal based on a first modified version of the second audio signal that is generated by adjusting the second audio signal based on a first mismatch value. The encoder is configured to determine, during a second period, that the first audio signal is the leading signal and that the second audio signal is the lagging signal. The encoder is configured to generate a second frame of the at least one encoded signal based on a second modified version of the second audio signal that is generated by adjusting the second audio signal based on the first mismatch value and a second mismatch value.
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Patent Agency Ranking
公开(公告)号：US20190005973A1
公开(公告)日：2019-01-03
申请号：US16000551
申请日：2018-06-05
Applicant: QUALCOMM Incorporated
IPC: G10L19/03 , G10L19/008 , G10L21/0388
CPC classification number: G10L19/03 , G10L19/008 , G10L19/0204 , G10L21/038 , G10L21/0388
Abstract: A method includes decoding a low-band portion of an encoded mid signal to generate a decoded low-band mid signal. The method also includes processing the decoded low-band mid signal to generate a low-band residual prediction signal and generating a low-band left channel and a low-band right channel based partially on the decoded low-band mid signal and the low-band residual prediction signal. The method further includes decoding a high-band portion of the encoded mid signal to generate a time-domain decoded high-band mid signal and processing the time-domain decoded high-band mid signal to generate a time-domain high-band residual prediction signal. The method also includes generating a high-band left channel and a high-band right channel based on the time-domain decoded high-band mid signal and the time-domain high-band residual prediction signal.
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公开(公告)号：US20180330739A1
公开(公告)日：2018-11-15
申请号：US15962834
申请日：2018-04-25
Applicant: QUALCOMM Incorporated
IPC: G10L19/008 , H04S1/00
CPC classification number: G10L19/008 , G10L19/005 , H04S1/007 , H04S2400/01
Abstract: An apparatus includes a receiver and a decoder. The receiver is configured to receive a bitstream that includes an encoded mid channel and a quantized value representing a shift between a reference channel associated with an encoder and a target channel associated with the encoder. The quantized value is based on a value of the shift. The value of the shift is associated with the encoder and has a greater precision than the quantized value. The decoder is configured to decode the encoded mid channel to generate a decoded mid channel and to generate a first channel based on the decoded mid channel. The decoder is further configured to generate a second channel based on the decoded mid channel and the quantized value. The first channel corresponds to the reference channel and the second channel corresponds to the target channel.
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公开(公告)号：US20180293992A1
公开(公告)日：2018-10-11
申请号：US15935952
申请日：2018-03-26
Applicant: QUALCOMM Incorporated
IPC: G10L19/008 , H04S3/00 , G10L19/083 , G10L19/06
Abstract: A method includes decoding a low-band mid channel bitstream to generate a low-band mid signal and a low-band mid excitation signal. The method further includes decoding a high-band mid channel bandwidth extension bitstream to generate a synthesized high-band mid signal. The method also includes determining an inter-channel bandwidth extension (ICBWE) gain mapping parameter corresponding to the synthesized high-band mid signal. The ICBWE gain mapping parameter is based on a selected frequency-domain gain parameter that is extracted from a stereo downmix/upmix parameter bitstream. The method further includes performing a gain scaling operation on the synthesized high-band mid signal based on the ICBWE gain mapping parameter to generate a reference high-band channel and a target high-band channel. The method includes outputting a first audio channel and a second audio channel. The first audio channel is based on the reference high-band channel, and the second audio channel is based on target high-band channel.
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公开(公告)号：US20180204578A1
公开(公告)日：2018-07-19
申请号：US15836604
申请日：2017-12-08
Applicant: QUALCOMM Incorporated
IPC: G10L19/008 , H04S3/00
CPC classification number: G10L19/008 , H04R5/02 , H04S3/008 , H04S2420/03
Abstract: A residual scaling unit is configured to determine a scaling factor for a residual channel based on an inter-channel mismatch value. The inter-channel mismatch value is indicative of a temporal alignment between a reference channel and a target channel. The residual scaling unit is further configured to scale (e.g., attenuate) the residual channel by the scaling factor to generate a scaled residual channel. A residual channel encoder is configured to encode the scaled residual channel as part of a bitstream.
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公开(公告)号：US20170365260A1
公开(公告)日：2017-12-21
申请号：US15620695
申请日：2017-06-12
Applicant: QUALCOMM Incorporated
IPC: G10L19/008 , G10L19/22 , G10L19/16
CPC classification number: G10L19/008 , G10L19/002 , G10L19/167 , G10L19/22
Abstract: A device for processing audio signals includes an interchannel temporal mismatch analyzer, an interchannel phase difference (IPD) mode selector and an IPD estimator. The interchannel temporal mismatch analyzer is configured to determine an interchannel temporal mismatch value indicative of a temporal misalignment between a first audio signal and a second audio signal. The IPD mode selector is configured to select an IPD mode based on at least the interchannel temporal mismatch value. The IPD estimator is configured to determine IPD values based on the first audio signal and the second audio signal. The IPD values have a resolution corresponding to the selected IPD mode.
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