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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Non-Linear Processor

Non-Linear Processor

Introduction

Owing to various reasons, the EC cannot cancel all the echoes. To improve the EC performance, a non-linear processing (NLP) is performed on the remaining echoes when the power of the remaining echoes is lower than a preset value. This can further reduce the power of the remaining echoes. A simple method is to replace the remaining echoes with the silence when the power of the remaining echoes is lower than the threshold.

Specifications

The NLP function can be enabled or disabled by configuring the DSP profile on a port. If the DSP profile is not configured, the system automatically enables or disables the NLP function according to the service mode. Specifically, for the voice service, the system enables the NLP function; for the fax or modem service, the system disables the NLP function.

Impact

The NLP function must be disabled in the case of FoIP or MoIP.

Reference Standards and Protocols

ITU-T G0.168, ITU-T G0.131, and ITU-T G0.161

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Updated: 2019-02-22

Document ID: EDOC1100067358

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