Error frame hiding device and method

An error, current frame technology, applied in the field of mobile wireless communication systems, can solve problems such as affecting the quality of decoded voice, unable to update the decoder correctly, etc., and achieve the effect of significant decoding voice quality, quality improvement, and significant improvement.

An error, current frame technology, applied in the field of mobile wireless communication systems, can solve problems such as affecting the quality of decoded voice, unable to update the decoder correctly, etc., and achieve the effect of significant decoding voice quality, quality improvement, and significant improvement.

CN101166071AInactive Publication Date: 2008-04-23BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Error frame hiding device and method
  • Error frame hiding device and method
  • Error frame hiding device and method

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Experimental program
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Embodiment Construction

[0019] The invention is based on the error frame concealment algorithm embedded in the EVRC speech codec and is improved.

[0020] According to the method of the present invention, when the first full-rate speech frame after the error frame occurs is correctly received, the decoding bit information of several correct full-rate frames received before the current frame and the error frame is used to perform interpolation. ) method to reconstruct all the decoding parameters (such as pitch delay, adaptive codebook gain, fixed codebook gain and synthesis filter tap coefficients, etc.) of the erroneously received frame. The purpose of the present invention is to use the decoding information of the first correct full-rate frame after the error frame, which can better restore the decoder state variable and Destruction of filter content, especially the pitch-delayed envelope signal. And re-decode the voice signal of the last error frame, and write it back to the output voice buffer, t...

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Abstract

This invention relates to a hiding method for error frames including: receiving data frames, when the current frame is correct yet the one before it is error, at least one frame before and after it is used to re-set up parameters necessary for re-setting up said error frame by interpolation and then reset up said error frame by the parameters.

Description

technical field [0001] The present invention relates to mobile wireless communication system, more specifically, relate to a kind of device and method for original error frame concealment (Frame Erasure Concealment) of EVRC (EnhancedVariable Rate Codec, enhanced type variable rate speech codec), to improve The decoded speech quality of the EVRC codec with errored frames. Background technique [0002] In the wireless communication transmission environment, the bit error rate of the wireless channel is relatively high, and the voice frame may be lost when receiving due to various complicated factors involved in the transmission process. The purpose of the error concealment (ECU, Erasure Concealment / PLC, Packet Loss Concealment) technology is to avoid the negative effects caused by the loss of speech frames. That is, when a speech frame is lost, in order not to make the listener feel the frame loss, the speech decoder should be notified to perform error concealment and perform...

Claims

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Application Information

Patent Timeline
23 Apr 2008
Publication
CN101166071A
IPC
H04L1/00; H04M3/24
Inventors
张川; 胡洪涛