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Lost frame hiding method and device

A frame loss and data technology, applied in the direction of correct operation test, voice analysis, instrument, etc., can solve the problems of voice quality reduction, unsatisfactory smoothing effect, discomfort, etc., to improve voice quality, reduce length, and reduce phase noise Effect

Inactive Publication Date: 2007-01-24
靖江市鑫晟汽车零部件制造有限公司
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Problems solved by technology

[0032] It can be seen that, when the first good frame arrives after the frame loss, the above method simply combines the data of the first 1 / 4 pitch period of the good frame with the data of the last 1 / 4 pitch period of the compensation frame for the latest lost frame. Superposition, in many cases, the smoothing effect of the superposition is not ideal, especially in an environment with a high frame loss rate, there is still a certain amount of phase noise, which reduces the voice quality and brings discomfort

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Embodiment Construction

[0074] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0075] The data preserved in the historical buffer and the pitch buffer mentioned in the present invention are the same as the prior art, and what are preserved in the historical buffer are the good frame data arranged in chronological order, the compensation data of frame loss, the first Historical record data such as the smoothing data of one good frame; the recorded data of one pitch period is stored in the pitch period buffer.

[0076] figure 2 The flow chart of frame loss concealment provided by the present invention, such as figure 2 As shown, the specific steps are as follows:

[0077] Step 201: Receive a good frame.

[0078] Step 202: Determine whether the current good frame is the first good frame after frame loss, if so, go to step 203; otherwise, go to step 214.

[0079] Step 203: Determine whether the current data le...

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Abstract

This invention discloses a hiding method for lost frames and a device, in which, when the invented method and device find out that the current frame is a first good frame after losing frames, they obtain a certain length of lost frame compensiation data from historical recorded data and fundamental period recorded data or from the fundamental recorded data then to search for the maximum mutual relation point of the first good frame in the data to smooth the current good frame based on the point and update the variety value of the data length of the current historical buffer region.

Description

technical field [0001] The invention relates to the technical field of voice transmission, in particular to a frame loss concealment method and device. Background technique [0002] IP phone is a kind of digital phone. It realizes voice communication on IP network or Internet through voice compression and encoding, packing and grouping, distribution and routing, storage switching, unpacking and decompression, etc., which promotes the utilization of network resources and reduces the cost of voice services. . But IP frames can be corrupted during network transmission, or lost due to network congestion or network failure, or simply dropped because they arrive too late at the receiving end to be included in the replayed voice. Frame loss is the most important cause of voice quality degradation in network transmission. When frame loss occurs, the lost frame must not be reproduced at the decoding end. [0003] At present, G.711 has proposed many frame loss concealment strategie...

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Application Information

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IPC IPC(8): H04L1/00H04L1/24H04B1/10G10L19/00
Inventor 莫运能李玉龙唐繁荣
Owner 靖江市鑫晟汽车零部件制造有限公司