Decoder and decoding method for multichannel audio coder using sound source location cue

Abstract

The present invention provides a decoder and a decoding method for multichannel audio coder using sound source location cue. The decoder includes a demultiplexer used for receiving a signal and analyzing the received signal into an audio bit stream and an additional information bit stream; an audio decoder, used for reproducing a download mixing signal based on the audio bit stream and transmitting the download mixing signal to a synthetic upload mixer, and making the reproduced download mixing signal to be not suitable for an analysis filter set; a synthetic upload mixer, used for forecasting a multichannel signal using the download mixing signal and the additional information bit stream, and performing an upload mixture to the download mixing signal to generate an upload mixing signal based on the multichannel signal; and a window-opening device for synthetic filter set, used for extracting a time field signal from the upload mixing signal by the synthetic filter set, and performing window open to the upload mixing signal so as to extract an output signal.

Description

technical field [0001] The invention discloses a multi-channel audio decoding device and method based on sound source location clues. Background technique [0002] The basic coding concept of Sound Source Location Cue Coding (SSLCC: Sound Source Location Cue Coding) starts from the method of Spatial Audio Coding (SAC: Spatial Audio Coding). [0003] The SAC is a multi-channel audio compression technology based on sound source location cues. It can maximize the compression efficiency by deleting the redundancy of each channel signal based on the spatial cues (Spatial Cue) recognized by people in the space. [0004] In addition, the multi-channel signal is basically processed by downloading and mixing, so that the incoming audio downloading signal becomes a core signal. That is, reproduction can be achieved through existing stereo audio, which is the basic principle of the SAC method. [0005] The SSLCC is one of the SAC methods and is a spatial cue recognized by people in s...

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Problems solved by technology

[0007] However, in order to restore a multi-channel audio signal based on sound source position cues from the downloaded mixed stereo signal by using redundant information, it is necessary to use the T / F (time to frequency ) transformation method with the same T / F transformation method, so if the T / F transformation method used in the process of extracting information through the SAC coding strategy is not the most suitable T / F transformation method at the receiving end, it will give the transformation process bring bad influence

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