Method and apparatus for transmitting and receiving encoding-decoding speech

Abstract

The invention relates to the communication field, and discloses a method for receiving and sending the voice coding and decoding and a device thereof, so as to allow the code efficiency of voice signals to be enhanced and the voice quality to be enhanced. The time-frequency conversion is performed to voice signals to obtain X frequency domain conversion coefficients, the X frequency domain conversion coefficients are quantified to obtain the broad-band coded signals, wherein, Y frequency domain conversion coefficients which are relatively important are quantified with a first codebook, the other X-Y frequency domain conversion coefficients are quantified with a second codebook, the code word quantity of the first codebook is higher than the code word quantity of the second codebook, Y is smaller than or equal to X and larger than or equal to 1, and the acquired broad-band coded signals are sent. According to the ratio of the average spectrum amplitude and the maximum spectrum amplitude of each quantified block, fine spectrum structures of the frequency domain quantified signals in the quantified block are reduced, wherein, the smaller the ratio is , the larger the reducing extent of the fine spectrum structures are.

Description

technical field [0001] The invention relates to the communication field, in particular to the speech codec technology. Background technique [0002] With the development of broadband metropolitan area network construction, broadband services are becoming more and more abundant, and the demand for broadband high-quality voice services is also increasing, such as broadband IP telephony and multi-point video conferencing. Therefore, a high-quality and low-complexity wideband speech codec has also been put on the agenda. How to be compatible with the currently widely used speech codec is a topic under study. [0003] In 2006, the International Telecommunication Union-Telecommunications Standardization Sector (International Telecommunication Union Telecommunication Standardization Sector, referred to as "ITU-T") successfully standardized the voice and audio codec compatible with G.729. ITU-T launched the G.711 wideband extension (7kHz bandwidth) standard solution collection in ...

AI Technical Summary

Problems solved by technology

[0005] However, the inventors of the present invention have found that among the X frequency-domain transform coefficients, there will always be some relatively important frequency-domain transform coefficients and relatively minor frequency-domain transform coefficients. If the coefficient is quantized and encoded, it may affect the encoding efficiency

[0006] On the other hand, due to the quantization of the sinusoidal spectrum, the spectrum adjacent to the sinusoidal spectrum will produce greater distortion, which is manifested as the valley of the spectrum being raised, and the noise is easy to be noticed

However, the current technology does not deal with it, so the voice quality is not good enough

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