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

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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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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