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Method of implementing source control rate of AMR speech sound coding

A technology of AMR voice and implementation method, which is applied in the field of voice coding, and can solve the problems of voice coding transmission coding redundancy, background noise discontinuity, disappearance, etc., and achieve the effects of saving calculation, reducing coding calculation, and saving bandwidth

Inactive Publication Date: 2006-03-29
连展科技(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A fundamental problem with SCRs is that if the sender is turned off, the background noise that is sent along with the speech disappears, causing the background noise to be discontinuous
[0028] Such an SCR mechanism, in some cases, there is coding redundancy in speech coding transmission

Method used

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  • Method of implementing source control rate of AMR speech sound coding
  • Method of implementing source control rate of AMR speech sound coding
  • Method of implementing source control rate of AMR speech sound coding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In the standard encoding method of the prior art, when in silent mode (that is, VAD flag="0"), after the first SID_FIRST frame is transmitted to the network, the SCR controller at the sending end will calculate and transmit a SID_UPDATE frame at regular intervals (ie comfort background noise) to the network. The SID_UPDATE frame is generated and transmitted every 8 frames, that is, 7 consecutive NO_DATA frames and then 1 SID_UPDATE frame is transmitted.

[0059] In this example, illustrate the N L = 24 cases.

[0060] such as figure 1 As shown, at the sending end, for 32 frames of comfort noise, in the coding of the prior art, these 32 frames contain 4 SID_UPDATE frames and 28 NO_DATA frames, and after adopting the method of the present invention, only 1 SID_UPDATE frame and 31 NO_DATA frames. Since the SID_UPDATE frame contains information and the NO_DATA frame does not contain information, after adopting the method of the present invention, it is at the sending en...

Embodiment 2

[0064] In this embodiment, taking the average reduction of 3 frames as an example, the average number of frames to be analyzed is shown in Table 3:

[0065] Happening

Corresponding N L value

The average number of frames required to reduce 3 frames F

0

24

32

1

48

28

2

72

26.67

3

96

26

[0066] table 3

[0067] After analysis, it can be found that the average required number of frames F for each reduction of 3 frames satisfies:

[0068] F = 4 + 3 * Mode Mode + 1 · 8 or: F = 24 ( N L + ...

Embodiment 3

N 3

[0077] table 5

[0078] In this way, when the system analyzes the information, for example, when the obtained data is "100", it means that the system is working in the enhanced mode at this time, and the method proposed by the present invention is used for encoding. where N L The value of is 24, that is to say, in the mute state, the SCR controller at the sending end of the AMR speech coding sends a SID_UPDATE frame to the network at a period of 32 frames. Under normal circumstances, the receiving end will only receive one SID_UPDATE frame every 32 frames. Compared with the standard encoding method, it receives 3 SID_UPDATE frames less in the same long silent period, so the receiving end will save the SID_UPDATE frame in the memory. The stored last received bad SID_UPDATE frame is used as the replacement frame information to replace the three omitted SID_UPDATE frames, so as to ensure that the comfort noise can be generated normally.

[0079] Asp...

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Abstract

This invention puts forward a method for realizing source control rate (SCR) for an AMR phone code including a SCR realization method for the AMR phone code sending end and a method for realizing SCR at the ARM receiving end, among which, the sending end sends a mute frame in a longer period of time and the receiving end needs to compute and generate a mute frame to replace the one lost by the sending end to generate comfortable noises smoothly.

Description

technical field [0001] The invention relates to the field of speech coding, in particular to a method for realizing source control rate in AMR speech coding. Background technique [0002] Adaptive Multi-Rate (AMR: Adaptive Multi Rate) speech coding is a speech compression coding technology developed by the 3rd Generation Mobile Communication Standardization Partnership Project (3GPP) and used in the 3rd generation mobile communication WCDMA system. One of the differences between it and the previous mobile communication voice coding method is that the previous mobile communication voice coding uses a fixed coding rate. However, when human beings perform voice communication, about 70% of the idle time is not speaking. Therefore, it is a waste of channel resources to always use one rate for voice coding. In addition, with the development of mobile communication, especially the third-generation mobile communication system, higher requirements are put forward for speech coding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L12/56H04J13/00G10L19/12
Inventor 何志斌李从兵郭更生王民
Owner 连展科技(天津)有限公司