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A voice decoding method and device

A voice decoding and current frame technology, applied in the field of communication, can solve the problem of no information in the high-frequency part, and achieve the effect of solving auditory discomfort and improving auditory quality

Active Publication Date: 2011-12-21
XFUSION DIGITAL TECH CO LTD
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Problems solved by technology

However, when the wideband speech signal is switched to a narrowband speech signal, the current frame of the narrowband speech signal does not have any information in the high frequency part, and the existing frequency band extension technology cannot well solve the above problems caused by different bandwidths. Problems with voice signals

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Embodiment Construction

[0024] The speech decoding method and device proposed by the embodiments of the present invention can improve the auditory quality of the speech signal, and avoid the problem of hearing discomfort caused by the speech signals of different bandwidths when the speech signal is decoded.

[0025] The technical solutions of the embodiments of the present invention will be described in detail below in the form of specific embodiments in conjunction with the accompanying drawings.

[0026] figure 1 It is a flow chart of a speech decoding method in Embodiment 1 of the present invention. like figure 1 As shown, the method includes:

[0027] Step S101, generating a high frequency spectrum of the current frame according to the low frequency frequency spectrum of the current frame which is a narrow frequency band.

[0028] Step S102 , judging whether the current frame needs to be corrected according to the low frequency band information of the current frame and the frequency band infor...

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Abstract

The invention discloses a tone decoding method and a device. The method comprises the following steps: utilizing the low-frequency band spectrum of the current frame of a narrow-frequency band to generate the high-frequency band spectrum of the current frame; judging whether the narrow band frame needs to be amended under certain conditions, and amending the high-frequency band spectrum of the narrow band frame in needing amending; changing the current frame which is treated according to a judging result from a frequency domain signal to a time domain signal; utilizing the attenuation factor of the current frame to attenuate the high-frequency time domain signal of the time domain signal of the current frame, and then outputting the time domain signal of the current frame. Correspondingly, the invention also discloses the tone decoding device, comprising an expansion unit, a first amending processing unit, a changing unit and an attenuation unit. By the tone decoding method and the device, the embodiment of the invention greatly solves the problem of uncomfortable hearing caused by the tone signals of different bandwidths and improves the hearing quality of the tone signals.

Description

technical field [0001] The invention relates to communication technology, in particular to a voice decoding method and device. Background technique [0002] For the current multi-rate voice and audio encoding and decoding algorithm, during the network transmission process of the coded code stream, due to the different network status, the network will truncate the code stream transmitted from the coder to the network with different lengths. At the decoding end, the decoder will decode voice and audio signals with different bandwidths or bit rates according to the truncated code stream, so that the received voice and audio signals will switch between different bandwidths. [0003] Due to the relationship between the filter state parameters in the decoder and the front and rear voice and audio signals, when the bandwidth is switched, the filter state parameters will be discontinuous. If some appropriate processing is not done in time, there will be Some phenomena of sudden cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L19/025
Inventor 刘泽新胡晨苗磊陈龙吟肖玮哈维.米希尔.塔迪张清
Owner XFUSION DIGITAL TECH CO LTD
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