Huawei Technologies Co., Limited

Mindspeed Technologies, Inc.

Conexant Systems, Inc.

Rockwell International Corporation

Other

University of California

Wiav Solutions LLC

Htc Corporation

Shlomot, Eyal

Eyal Shlomot

Adil Benyassine

Yang Gao

Huan-Yu Su

Haiting Li

Jes Thyssen

Jonathan A Gibbs

Lei Miao

Jinliang Dai

Halting Li

Zexin Liu

Carlo Murgia

Libin Zhang

Bin Wang

Yuanyuan Liu

Panji Setiawan

Vladimir Cuperman

Tao Li

Yuan Gao

Allen Gersho

Chunyan Li

Lin Wang

Zhe Wang

Jeffrey D Klein

Deming Zhang

Xin Zhi Ma

Fuliang Yin

Aruna Vittal

Qiang Ye

Albert Achuan Hsueh

Jiliang Dai

Zho Wang

Adil Benyassinc

Michael J Simpson

This disclosure provides a encoding method, and an encoder for a multi-channel signal. The encoding method includes: obtaining a first ITD of a current frame of a multi-channel signal includes an initial left channel signal and an initial right channel signal; obtaining a second ITD of the current frame based on the first ITD and a third ITD of a previous frame of the multi-channel signal; performing delay alignment on the initial left channel signal and the initial right channel signal based on the second ITD, to obtain an aligned left channel signal and an aligned right channel signal; and encoding the aligned left channel signal and the aligned right channel signal.

Encoding and decoding methods, and encoding and decoding apparatuses for stereo signal

Various embodiments provide a method and an apparatus for determining a weighting factor during stereo signal encoding. In those embodiments, a parameter value corresponding to the encoding mode of the to-be-encoded signal is determining based on an encoding mode of a to-be-encoded signal in a stereo signal and a correspondence between an encoding mode and a parameter value. Based on the determined parameter value and an energy spectrum of a linear prediction filter corresponding to an original line spectral frequency parameter of the to-be-encoded signal is a weighting factor for calculating a distance between the original line spectral frequency parameter and a target original line spectral frequency parameter is calculated.

Method and apparatus for determining weighting factor during stereo signal encoding

This invention describes a universal pointing and interacting (UPI) device that is configured to interact with a handheld device such as a smartphone or a tablet. The interaction means activating the screen of the handheld device based on the relative spatial relations between the UPI device and the handheld device. In addition, the interaction means activating other elements, such as audio playing, vibration motors and others, on either the handheld device or the UPI device. The relative spatial relations between the UPI device and the handheld device are estimated using a camera, an accelerometer, a magnetometer or a LIDAR on the handheld device, as well as by using a camera, an accelerometer, a magnetometer or a LIDAR on the UPI device.

Activating a handheld device with universal pointing and interacting device

A stereo signal processing method includes performing delay estimation on a stereo signal of a current frame to determine an inter-channel time difference of the current frame, identifying a sign of the inter-channel time difference of the current frame is different from a sign of an inter-channel time difference of a previous frame of the current frame, performing delay alignment processing on the first-channel signal of the current frame based on the inter-channel time difference of the current frame, and performing delay alignment processing on the second-channel signal of the current frame based on the inter-channel time difference of the previous frame.

Stereo signal processing method and apparatus

A stereo signal encoding method includes performing spectrum broadening on a quantized line spectral frequency (LSF) parameter of a primary channel signal in a current frame in a stereo signal to obtain a spectrum-broadened LSF parameter of the primary channel signal, determining a prediction residual of an LSF parameter of a secondary channel signal in the current frame based on an original LSF parameter of the secondary channel signal and the spectrum-broadened LSF parameter of the primary channel signal, and performing a quantization on the prediction residual of the LSF parameter of the secondary channel signal.

Stereo signal encoding method and apparatus, and stereo signal decoding method and apparatus

An encoding method includes determining an adaptive broadening factor based on a quantized line spectral frequency (LSF) vector of a first channel of a current frame of an audio signal and an LSF vector of a second channel of the current frame, and writing the quantized LSF vector and the adaptive broadening factor into a bitstream.

Audio signal encoding method and apparatus

A delay estimation method includes determining a cross-correlation coefficient of a multi-channel signal of a current frame, determining a delay track estimation value of the current frame based on buffered inter-channel time difference information of at least one past frame, determining an adaptive window function of the current frame, performing weighting on the cross-correlation coefficient based on the delay track estimation value of the current frame and the adaptive window function of the current frame, to obtain a weighted cross-correlation coefficient, and determining an inter-channel time difference of the current frame based on the weighted cross-correlation coefficient.

Delay estimation method and apparatus

Various embodiments provide a method and an apparatus for determining a weighting factor during stereo signal encoding. In those embodiments, a parameter value corresponding to the encoding mode of the to-be-encoded signal is determined based on an encoding mode of a to-be-encoded signal in a stereo signal and a correspondence between an encoding mode and a parameter value. Based on the determined parameter value and an energy spectrum of a linear prediction filter corresponding to an original line spectral frequency parameter of the to-be-encoded signal, a weighting factor for calculating a distance between the original line spectral frequency parameter and a target original line spectral frequency parameter is calculated.

A stereo encoding method and apparatus, and a stereo decoding method and apparatus are disclosed. The stereo encoding method includes: performing downmix processing on a left channel signal of a current frame and a right channel signal of the current frame, to obtain a primary channel signal of the current frame and a secondary channel signal of the current frame; and when determining that a frame structure similarity value falls within a frame structure similarity interval, performing differential encoding on a pitch period of the secondary channel signal by using an estimated pitch period value of the primary channel signal, to obtain a pitch period index value of the secondary channel signal, where the pitch period index value of the secondary channel signal is used to generate a to-be-sent stereo encoded bitstream.

Stereo encoding method and apparatus, and stereo decoding method and apparatus

This disclosure provides a decoding method, and a decoding apparatus for a stereo signal. The decoding method includes: decoding a bitstream to obtain a first channel signal, a second channel signal, and a first ITD of a current frame of a stereo signal; performing a mixing processing on the first channel signal and the second channel signal, to obtain a third channel reconstructed signal and a fourth channel reconstructed signal; performing interpolation processing based on the first ITD and a second ITD of a previous frame previous to the current frame, to obtain a third ITD; and adjusting a delay of the third channel reconstructed signal and the fourth channel reconstructed signal based on the third ITD.

A stereo signal encoding method includes determining a window length of an attenuation window based on an inter-channel time difference; determining a modified linear prediction analysis window based on the window length of the attenuation window, where values of at least some points from a point (L&#x2212;sub_window_len) to a point (L&#x2212;1) in the modified linear prediction analysis window are less than values of corresponding points from a point (L&#x2212;sub_window_len) to a point (L&#x2212;1) in an initial linear prediction analysis window, and the window length of the modified linear prediction analysis window is equal to a window length of the initial linear prediction analysis window; and performing linear prediction analysis on a to-be-processed sound channel signal based on the modified linear prediction analysis window.

Stereo signal encoding method and encoding apparatus

A method for encoding an input signal comprising signal frames into quantized bits is disclosed, the method comprises generating, for each frame of the input signal, a signal matrix comprising matrix coefficients obtained from that frame, grouping the matrix coefficients of each signal matrix into a plurality of partition vectors, and for each partition vector, selecting one vector quantization scheme from among a plurality of vector quantization schemes and quantizing that partition vector according to the selected vector quantization scheme to obtain the quantized bits. In an adaptive mode, the method comprises grouping differently the matrix coefficients obtained from different frames, and/or selecting different vector quantization schemes for partition vectors obtained from different frames.

Adaptive quantization of weighted matrix coefficients

Growing community of inventors

Long Beach, CA, United States of America

Eyal Shlomot