Encoding/decoding device and method

Abstract

The invention relates to a coding and decoding method and a device thereof. The invention primarily comprises the following steps: after a previous frame adopts a first encoding mode for encoding, and a current frame needs to adopt a second encoding mode for encoding, the encoded data of the length of the overlapped data in the previous frame is acquired according to the determined length of the overlapped encoded data of the current frame and the previous frame; subsequently, the encoded data acquired from the previous frame and the encoded data of the current frame are encoded by adopting the second encoding mode, thus acquiring the encoded results. A corresponding mode is adopted at the decoding end for decoding. Accordingly, in the invention, transform domain coding and decoding is completed without filter operation, thus simplifying the transform domain coding and decoding course under an entire mode switch, and facilitating the realization of software and hardware.

Description

technical field [0001] The present invention relates to the technical field of encoding and decoding, in particular to an encoding and decoding method and device. Background technique [0002] With the gradual and widespread application of multimedia services, due to the characteristics of multimedia services, higher encoding efficiency and real-time performance are required in the encoding process for multimedia services. At the same time, the corresponding audio encoding bandwidth also needs to be further expanded. [0003] At present, technologies adopted by the industry to meet low bit rate and high-quality audio coding include AMR-WB+ (Adaptive Multi-Rate Wideband codec, adaptive multi-rate wideband multimedia signal codec) technology. The encoder based on AMR-WB+ mainly includes the following two encoding modes: [0004] (1) ACELP (Algebraic Code Excited Linear Prediction, Algebraic Code Excited Linear Prediction) mode, used to encode speech; [0005] (2) TCX (Transf...

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Problems solved by technology

[0017] By calculating z above w It can be seen from the processing process of (n) value that the codec scheme provided by the prior art to eliminate inter-frame discontinuity in AMR-WB+ is based on the fact that the zero-input response is similar to the signal at the beginning of the current frame. Therefore, when the zero-input response is not similar to the signal at the beginning of the current frame, the corresponding effect of eliminating the discontinuity between frames cannot be guaranteed

Moreover, in the process of eliminating inter-frame discontinuity, it is necessary to calculate the zero-input response of the synthetic weighting filter, and the corresponding algorithm complexity is relatively high, so that the implementation complexity of the encoding and decoding process will also increase accordingly

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