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Linear echo control method

An echo and linear technology, applied in the field of linear echo control, can solve the problems of no working parameter initialization, data service failure, voice quality degradation, etc., to avoid data service failure, avoid failure, and improve voice quality.

Active Publication Date: 2011-04-20
HUAWEI TECH CO LTD
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Problems solved by technology

[0024] The purpose of the present invention is to provide a method for controlling linear echo. Through the present invention, the problem of data service failure caused by NLP not being closed when the low-speed data service adopts the transparent transmission scheme is solved.
[0025] The purpose of the present invention is to provide another method for controlling the linear echo. Through the present invention, it solves the problem that when the facsimile adopts the T38 mode to make a voice call after the work is completed, the working parameters of the EC are not initialized, resulting in voice quality. falling problem
[0026] In addition, through the present invention, the problem of data service failure caused by NLP re-enabling when the Sin and Rin terminals of the EC have no input signal for more than 400ms after NLP is closed is solved

Method used

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no. 1 example

[0052] The first embodiment provided by the present invention, as shown in Figure 3, includes:

[0053] Step 101, establishing a voice link.

[0054] Step 102, detecting the signal input from the Sin terminal of the EC on the current voice link.

[0055] Because the signals sent by data devices such as V21 flag and ANSam need to be sent out through the EC, so at the Sin end of the EC on the current voice link, the signal sent by the data device can be obtained by detecting the input signal.

[0056] Step 103. Determine whether the service transmitted on the current link is a data service according to the detected signal. If it is confirmed that the service is a data service, perform step 104; otherwise, end.

[0057] Step 104, judge whether the current data service is a low-speed data service according to the type of the detected signal. The linear processor stops controlling the linear echo, and then executes step 106; otherwise, executes step 107, that is, turns off the EC...

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Abstract

The invention relates to a linear echo control method, and its kernel: detecting the carried signal on the current link; when confirming the service is a low-speed data service according to the detected signal, enabling EC (echo counteractor) and simultaneously closing NLP (nonlinear processor), and stopping the linear echo control. Thus, it can assure being able to control to close NLP while enabling EC in NGN structure so as to avoid data service failure. When fax service adopts T38 mode and channel state is switched from T38 state to voice state, it can reinitialize EC parameters, thus able to improve voice quality by EC. In addition, it keeps the states of EC and NLP until the service ends, thus avoiding the data service failure caused by re-enabling NLP.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for controlling linear echo. Background technique [0002] In the network of NGN architecture, the IP network is used to carry data services, and its transmission delay is much larger than that of the traditional PSTN network. Therefore, it is necessary to add EC (adaptive echo canceller) The echo introduced by the device can improve the voice quality. [0003] The working principle of EC is mainly to use the adaptive filter to cancel the linear echo, and use the NLP (non-linear processor) to completely cancel the residual echo after the adaptive filter, so as to achieve the best subjective effect. [0004] Since the traditional PSTN network can carry data services (fax and Modem services), the main purpose of setting up EC is to improve voice quality, which requires that EC should not affect data services while offsetting echo. The current international standard on EC is mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M3/00H04M7/00H04B3/20
Inventor 谢宁
Owner HUAWEI TECH CO LTD
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