Package loss compensation method, apparatus and system based on frequency domain

A compensation method and compensation system technology, applied in speech analysis, instruments, etc., can solve the problems of wideband, ultra-wideband encoder broadband and ultra-wideband extensions, etc., and achieve the effect of subjective quality improvement and high continuity

Inactive Publication Date: 2009-07-01
徐州永威木业有限公司
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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: in the narrowband codec of the CELP model, there are many methods and systems for packet loss compensation, but the existing packet loss compensation technologies are all in It is processed in the time domain and is mostly used in narrowband encoders. It cannot be used for wideband and ultrawideband extensions of wideband and ultrawideband encoders.

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  • Package loss compensation method, apparatus and system based on frequency domain
  • Package loss compensation method, apparatus and system based on frequency domain
  • Package loss compensation method, apparatus and system based on frequency domain

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Embodiment Construction

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0028] The solution of the present invention compensates the information of the broadband signal with packet loss through the extrapolation and / or interpolation of the signal frequency domain information between frames, thereby improving the quality of the sound signal.

[0029] First, the application environment of the embodiment of the present invention, that is, a wideband or ultra-wideband codec system is described. Among them, the structure of the encoding end...

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Abstract

The invention discloses a lost packet compensation method based on a frequency domain, which comprises the following steps: adopting a data recovery instrument to recover core decoding data which is corresponding to a lost frame, predicting according to the frequency domain of the discrete cosine transform MDCT coefficient which is improved at the front frame and/or the rear frame of the lost frame, obtaining the MDCT coefficient corresponding to the lost frame, and synthesizing the recovered core decoding data and the MDCT coefficient obtained through the predicting to obtain the recovery frame corresponding to the lost frame. The invention further discloses a device and a system of the lost packet compensation based on the frequency domain. The proposal of the invention can provide higher continuity in the sound decoding frequency domain and better smoothness of sound signals, and improves the subjective quality.

Description

technical field [0001] The present invention relates to the technical field of sound coding, in particular to a frequency domain-based packet loss compensation method, device and system. Background technique [0002] With the development of third generation (3G) and fourth generation (4G) mobile communication technologies and broadband Internet, there is an increasing demand for broadband voice services, such as Voice over Internet Protocol (VoIP) services. Broadband voice services involve voice compression and encoding, packetization, routing, storage and switching, depacketization and decompression, etc., and implement voice communication on the IP network or the Internet, which promotes the utilization of network resources and reduces the cost of voice services. Voice higher quality service. [0003] Key technologies of broadband voice services include signaling technology, coding technology, real-time transmission technology, quality of service (QoS) guarantee technolog...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/14G10L19/12
Inventor 吴文海肖玮王庭红李立雄张德军张亮
Owner 徐州永威木业有限公司
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