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Method and device for gain quantization in variable bit rate wideband speech coding

一种编码、编码器的技术，应用在语音分析、仪器等方向，能够解决语音性能下降、不能开始和瞬态信号编码等问题

Inactive Publication Date: 2010-05-05
NOKIA TECH OY
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  • Application Information

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Problems solved by technology

Speech performance degrades when the rate selection module selects the frames to be encoded as full rate frames and the system utilizes e.g. HR frames, because the dedicated HR mode is not able to efficiently encode onset and transient signals

Method used

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  • Method and device for gain quantization in variable bit rate wideband speech coding
  • Method and device for gain quantization in variable bit rate wideband speech coding
  • Method and device for gain quantization in variable bit rate wideband speech coding

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Embodiment Construction

[0048] Although the non-limiting illustrative embodiment of the present invention will be described in terms of speech signals, it should be remembered that the present invention can also be used for other sound signal types such as audio signals.

[0049] figure 1 The voice communication system 100 describing the environment in which the voice encoding and decoding apparatus according to the present invention is used is explained. The voice communication system 100 supports the transmission and reproduction of voice signals through the communication channel 105. Although the communication channel 105 may include, for example, a wire, optical, or fiber optic link, it usually includes, at least in part, a radio link. Radio frequency links generally support multiple simultaneous voice communications that require shared bandwidth resources, such as can be found in cellular phone embodiments. Although not shown in the figure, the communication channel 105 may be replaced by a stora...

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PUM

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Abstract

The present invention relates to a gain quantization method and device for implementation in a technique for coding a sampled sound signal processed, during coding, by successive frames of L samples,wherein each frame is divided into a number of subframes and each subframe comprises a number N of samples, where N<L. In the gain quantization method and device, an initial pitch gain is calculated based on a number f of subframes, a portion of a gain quantization codebook is selected in relation to the initial pitch gain, and pitch and fixed-codebook gains are jointly quantized. This joint quantization of the pitch and fixed-codebook gains comprises, for the number f of subframes, searching the gain quantization codebook in relation to a search criterion. The codebook search is restricted tothe selected portion of the gain quantization codebook and an index of the selected portion of the gain quantization codebook best meeting the search criterion is found.

Description

Technical field [0001] The present invention relates to an improved technique for digitally encoding a sound signal, in particular, considering the transmission and synthesis of the sound signal, not just the speech signal. Background technique [0002] In various application fields such as teleconferencing, multimedia, and wireless communications, there is an increasing demand for high-efficiency digital narrowband and wideband speech coding technologies that have an excellent trade-off between subjective quality and bit rate. Until recently, the phone bandwidth limited between 200-3400Hz has been mainly used in speech coding applications. However, compared with traditional telephone bandwidth, broadband voice applications provide enhanced intelligibility and naturalness in communications. It has been found that the bandwidth in the range of 50-7000 Hz is sufficient to deliver excellent sound quality as face-to-face communication. For general audio signals, although this bandw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/08G10L19/14
CPCG10L19/083G10L19/24G10L19/12
Inventor M·耶林克R·萨拉米
Owner NOKIA TECH OY
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