Error concealment method for audio data frame, and audio decoding device

Abstract

The invention relates to the field of communication, and discloses an error concealment method for an audio data frame, and an audio decoding end. The error concealment method comprises the following steps of: determining a type of a window sequence of an error frame; and reestablishing MDCT coefficients of the error frame, wherein the MDCT coefficients of the error frame are divided into an audio type and a noise type, the MDCT coefficients belonging to the audio type are obtained by estimating interpolations of corresponding MDCT coefficients of a last frame and a next frame, and the MDCT coefficients belonging to the noise type are generated by shaping noise. Compared with a noise shaping interpolation algorithm provided by a 3GPP standard, under the condition of increasing a small amount of implementation complexity, the error concealment method better recovers tone information in the error frame sensitive to the hearing of human ears so as to obtain better balance between concealment quality and the implementation complexity.

Description

technical field [0001] The invention relates to the communication field, in particular to audio decoding technology in the communication field. Background technique [0002] China Mobile Multimedia Broadcasting (CMMB for short) is a mobile TV and multimedia standard based on satellite and terrestrial interactive multi-service architecture (STiMi). The network construction and terminal popularization of CMMB have developed rapidly in the past two years. CMMB is increasingly becoming the most widely popular technical standard and industry standard for mobile multimedia broadcasting in my country. [0003] In the CMMB standard, two digital audio coding specifications are adopted, namely MPEG (Motion Picture Experts Group)-4HE-AAC (High Efficiency Advanced Audio Coding) and DRA (Multi-channel Digital Audio Codec Technical Specification). These two coding standards both adopt a time-frequency conversion method of Modified Discrete Cosine Transform (MDCT for short). [0004] In...

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Problems solved by technology

[0007] However, although the shaping noise interpolation algorithm proposed by the above-mentioned 3GPP has a small implementation complexity, it cannot recover the tone information sensitive to human hearing in the error frame.

The inventors of the present invention have found that currently proposed digital audio error concealment algorithms cannot always solve the balance between concealment quality and implementation complexity

The implementation complexity introduced by the method of simple silence or repeating the previous frame is small, but the auditory quality after masking is poor; while the method based on signal model or time domain prediction usually has higher masking auditory quality, but the implementation introduced The complexity is large, including the large amount of calculation, storage requirements and delay requirements, and it is difficult to achieve real-time implementation on the processor of the mobile terminal

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