公开(公告)号：US20180268828A1

公开(公告)日：2018-09-20

申请号：US15892130

申请日：2018-02-08

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman ATTI ,  Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM

IPC: G10L19/008 ,  G10L19/12 ,  H04S3/00 ,  G10L19/005

CPC classification number: G10L19/008 ,  G10L19/005 ,  G10L19/12 ,  H04S3/008 ,  H04S2400/03 ,  H04S2400/15

Abstract: A method of encoding audio channels includes receiving two or more channels at an encoder and identifying a target channel and a reference channel. The target channel and the reference channel are identified from the two or more channels based on a mismatch value. The method also includes generating a modified target channel by temporally adjusting the target channel based on the mismatch value. The mismatch value is indicative of an amount of temporal mismatch between the target channel and the reference channel. The method also includes determining a temporal correlation value indicative of a temporal correlation between a first signal associated with the reference channel and a second signal associated with the modified target channel. The method also includes comparing the temporal correlation value to a threshold. The method further includes generating missing target samples based on the comparison, a coder type, or both.

公开(公告)号：US20180109896A1

公开(公告)日：2018-04-19

申请号：US15708717

申请日：2017-09-19

Applicant: QUALCOMM Incorporated

Inventor： Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM ,  Venkatraman ATTI

IPC: H04S3/00 ,  G10L19/008

CPC classification number: H04S3/008 ,  G10L19/008 ,  G10L19/0204 ,  G10L19/022 ,  H04S1/007 ,  H04S2400/01 ,  H04S2420/03 ,  H04S2420/07

Abstract: A stereo parameter conditioner performs a conditioning operation on a first value of a stereo parameter and a second value of the stereo parameter to generate a conditioned value of the stereo parameter. The first value is associated with a first frequency range, and the second value is associated with a second frequency range. The conditioned value is associated with a particular frequency range that is a subset of the first frequency range or a subset of the second frequency range.

公开(公告)号：US20240420704A9

公开(公告)日：2024-12-19

申请号：US18513188

申请日：2023-11-17

Applicant: QUALCOMM Incorporated

Inventor： Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM ,  Venkatraman ATTI

IPC: G10L19/008 ,  G10L19/005 ,  H04S1/00

Abstract: An apparatus includes a receiver and a decoder. The receiver is configured to receive a bitstream that includes a first frame and a second frame. The first frame includes a first portion of a mid channel and a first quantized stereo parameter. The second frame includes a second portion of the mid channel and a second quantized stereo parameter. The decoder is configured to generate a first portion of a channel based on the first portion of the mid channel and the first quantized stereo parameter. The decoder is configured to, in response to the second frame being unavailable for decoding operations, estimate the second quantized stereo parameter based on stereo parameters of one or more preceding frames and generate a second portion of the channel based on the estimated second quantized stereo parameter. The second portion of the channel corresponds to a decoded version of the second frame.

公开(公告)号：US20220139410A9

公开(公告)日：2022-05-05

申请号：US17083254

申请日：2020-10-28

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman ATTI ,  Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM

IPC: G10L19/087 ,  G10L19/24 ,  G10L19/02 ,  G10L19/03 ,  G10L19/16

Abstract: A device for signal processing includes a memory and a processor. The memory is configured to store a parameter associated with a bandwidth-extended audio stream. The processor is configured to select a plurality of non-linear processing functions based at least in part on a value of the parameter. The processor is also configured to generate a high-band excitation signal based on the plurality of non-linear processing functions.

公开(公告)号：US20200066283A1

公开(公告)日：2020-02-27

申请号：US16673733

申请日：2019-11-04

Applicant: QUALCOMM Incorporated

Inventor： Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM ,  Venkatraman ATTI

IPC: G10L19/008 ,  H04S5/02 ,  G10L19/16 ,  H04R3/12 ,  G10L21/038 ,  H04R3/00 ,  H04S1/00

Abstract: A method includes generating a synthesized non-reference high-band channel based on a non-reference high-band excitation corresponding to a non-reference target channel. The method further includes estimating one or more spectral mapping parameters based on the synthesized non-reference high-band channel and a high-band portion of the non-reference target channel. The method also includes applying the one or more spectral mapping parameters to the synthesized non-reference high-band channel to generate a spectrally shaped synthesized non-reference high-band channel. The method further includes generating an encoded bitstream based on the one or more spectral mapping parameters and the spectrally shaped synthesized non-reference high-band channel.

公开(公告)号：US20190378523A1

公开(公告)日：2019-12-12

申请号：US16547226

申请日：2019-08-21

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman ATTI ,  Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM

IPC: G10L19/008 ,  H04S3/00

Abstract: A device includes a processor that is configured to determine an inter-channel mismatch value indicative of a temporal misalignment between a frequency-domain reference channel and a frequency-domain target channel. The processor is also configured to adjust the frequency-domain target channel based on the inter-channel mismatch value to generate an adjusted frequency-domain target channel. The processor is further configured to perform a down-mix operation, based on the frequency-domain reference channel and the adjusted frequency-domain target channel, to generate a mid channel and a side channel. The processor is also configured to generate a predicted side channel based on the mid channel. The processor is further configured to generate a residual channel based on the side channel and the predicted side channel. The processor is also configured to encode the residual channel as part of a bitstream.

公开(公告)号：US20190297444A1

公开(公告)日：2019-09-26

申请号：US16437518

申请日：2019-06-11

Applicant: QUALCOMM Incorporated

Inventor： Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM ,  Venkatraman ATTI

IPC: H04S3/00 ,  G10L19/008 ,  H04S1/00

Abstract: A stereo parameter conditioner performs a conditioning operation on a first value of a stereo parameter and a second value of the stereo parameter to generate a conditioned value of the stereo parameter. The first value is associated with a first frequency range, and the second value is associated with a second frequency range. The conditioned value is associated with a particular frequency range that is a subset of the first frequency range or a subset of the second frequency range.

公开(公告)号：US20190295559A1

公开(公告)日：2019-09-26

申请号：US16442145

申请日：2019-06-14

Applicant: QUALCOMM Incorporated

Inventor： Venkatraman ATTI ,  Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM

IPC: G10L19/008 ,  H04R5/02 ,  H04S3/00

Abstract: A method includes performing modifying, at a decoder, at least a portion of inter-channel phase difference (IPD) parameter values based on a mismatch value to generate modified IPD parameter values. The mismatch value is indicative of an amount of temporal misalignment between an encoder-side reference channel and an encoder-side target channel. The modified IPD parameter values are applied to a decoded frequency-domain mid channel during an up-mix operation.

公开(公告)号：US20190180761A1

公开(公告)日：2019-06-13

申请号：US16280744

申请日：2019-02-20

Applicant: QUALCOMM Incorporated

Inventor： Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM ,  Venkatraman ATTI

IPC: G10L19/008 ,  G10L21/038 ,  G10L19/26 ,  H04S3/00 ,  G10L19/022

Abstract: An apparatus includes a decoder configured to receive, from an encoder, a frame associated with an audio bitstream and with a first sampling rate. The decoder is configured to perform a frequency-domain upmix on data associated with the frame to generate left and right frequency-domain signals and is further configured to generate, based on the left and right frequency-domain signals, left and right time-domain signals that each have a second sampling rate. The second sampling rate is determined by the decoder, based on one or both of the first sampling rate and an output sampling rate, and is adjustable by the decoder to enable different frames to be decoded at different second sampling rates. The decoder is further configured to generate, based on the left and right time-domain signals, left and right resampled signals that each have the output sampling rate.

公开(公告)号：US20190108846A1

公开(公告)日：2019-04-11

申请号：US16147208

申请日：2018-09-28

Applicant: QUALCOMM Incorporated

Inventor： Venkata Subrahmanyam Chandra Sekhar CHEBIYYAM ,  Venkatraman ATTI

IPC: G10L19/008

Abstract: A device includes a receiver configured to receive an inter-channel prediction gain parameter and an encoded audio signal. The encoded audio signal includes an encoded mid signal. The device also includes a decoder configured to generate a synthesized mid signal based on the encoded mid signal. The decoder is configured to generate an intermediate synthesized side signal based on the synthesized mid signal and the inter-channel prediction gain parameter. The decoder is further configured to filter the intermediate synthesized side signal to generate a synthesized side signal.