Tone decoding method and device

A voice decoding and current frame technology, which is 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
CN101751925AActive Publication Date: 2010-06-23XFUSION DIGITAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XFUSION DIGITAL TECH CO LTD
Publication Date
2010-06-23

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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.
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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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