Abstract: A multi-channel audio signal coding method includes obtaining a to-be-encoded first audio frame, pairing at least five channel signals according to a first pairing manner to obtain a first channel pair set, obtaining a first sum of correlation values of the first channel pair set, where one channel pair has one correlation value, pairing the at least five channel signals according to a second pairing manner to obtain a second channel pair set, obtaining a second sum of correlation values of the second channel pair set, determining a target pairing manner of the at least five channel signals based on the first sum of correlation values and the second sum of correlation values, and encoding the at least five channel signals based on a channel pair set corresponding to the target pairing manner, where the target pairing manner is the first pairing manner or the second pairing manner.

Abstract: This application disclose an audio processing method and a terminal. The method includes: decoding an audio bitstream to obtain audio optimization metadata, basic audio metadata, and M pieces of decoded audio data, the audio optimization metadata includes first metadata of a first optimized listening area and a first decoding audio mixing parameter corresponding to the first optimized listening area; rendering M pieces of decoded audio data based on a current location of a user and the basic audio metadata, to obtain M pieces of rendered audio data; when the current location is in the first optimized listening area, performing first audio mixing on the M pieces of rendered audio data based on the first decoding audio mixing parameter, to obtain M pieces of first audio mixing data; and mixing the M pieces of first audio mixing data, to obtain mixed audio data corresponding to the first optimized listening area.

Abstract: The present disclosure provides a bit allocation method and apparatus for an audio signal. The bit allocation method for an audio signal includes: obtaining T audio signals in a current frame, where T is a positive integer; determining a first audio signal set based on the T audio signals, where the first audio signal set includes M audio signals, M is a positive integer, T?M; determining M priorities of the M audio signals in the first audio signal set; and performing bit allocation on the M audio signals based on the M priorities of the M audio signals.

Abstract: A multi-channel audio signal coding method includes obtaining a to-be-encoded first audio frame, pairing at least five channel signals according to a first pairing manner to obtain a first channel pair set, obtaining a first sum of correlation values of the first channel pair set, where one channel pair has one correlation value, pairing the at least five channel signals according to a second pairing manner to obtain a second channel pair set, obtaining a second sum of correlation values of the second channel pair set, determining a target pairing manner of the at least five channel signals based on the first sum of correlation values and the second sum of correlation values, and encoding the at least five channel signals based on a channel pair set corresponding to the target pairing manner, where the target pairing manner is the first pairing manner or the second pairing manner.

Abstract: An audio signal rendering method includes obtaining a to-be-rendered audio signal by decoding a received bitstream, obtaining control information, where the control information indicates at least one of content description metadata, rendering format flag information, loudspeaker configuration information, application scene information, tracking information, posture information, or location information, and rendering the to-be-rendered audio signal based on the control information to obtain a rendered audio signal.

Abstract: A multi-channel audio signal encoding method includes: obtaining a to-be-encoded first audio frame; obtaining a correlation value set, where the correlation value set includes respective correlation values of a plurality of channel pairs; selecting M correlation values from the correlation value set, where all the M correlation values are greater than correlation values other than the M correlation values in the correlation value set, and all the M correlation values are greater than or equal to a pairing threshold; obtaining M channel pair sets; determining a target channel pair set from the M channel pair sets, where a sum of correlation values of all channel pairs in the target channel pair set is the largest in those of the M channel pair sets; and encoding the first audio frame based on the target channel pair set.

Abstract: A stereo audio signal delay estimation method includes obtaining a current frame of a stereo audio signal. The current frame includes a first channel audio signal and a second channel audio signal. Estimating an inter-channel time (ITD) of the current frame using a first algorithm when a signal type of a noise signal included in the current frame is a coherent noise signal type, or estimating the ITD using a second algorithm when the signal type of the noise signal is a diffuse noise signal type. The first algorithm includes weighting a frequency domain cross power spectrum based on a first weighting function that includes a first construction factor. The second algorithm includes weighting the frequency domain cross power spectrum based on a second weighting function that includes a second construction factor different from the first construction factor.

Abstract: Disclosed are a multi-channel audio signal encoding method and apparatus. Audio signals of P channels in a current frame of a multi-channel audio signal can be obtained, where the audio signals of the P channels include audio signals of K channel pairs; respective bit quantities of the K channel pairs are determined based on the respective energy/amplitudes of the audio signals of the P channels and a quantity of available bits; and the audio signals of the P channels are encoded based on the respective bit quantities of the K channel pairs to obtain an encoded bitstream, to improve encoding quality.

Abstract: Multi-channel audio signal encoding and decoding methods and apparatuses (1100, 1300) are provided. This can reduce a quantity of bits of multi-channel side information, so that saved bits can be allocated to another functional module of an encoder, to improve quality of a reconstructed audio signal of a decoder side and improve coding quality.

Abstract: The present disclosure provides a bit allocation method and apparatus for an audio signal. The bit allocation method for an audio signal includes: obtaining T audio signals in a current frame, where T is a positive integer; determining a first audio signal set based on the T audio signals, where the first audio signal set includes M audio signals, M is a positive integer, T ? M; determining M priorities of the M audio signals in the first audio signal set; and performing bit allocation on the M audio signals based on the M priorities of the M audio signals.