Echo suppression method and echo suppression device

Abstract

The embodiment of the invention provides an echo suppression method and an echo suppression device. Echo in a complex network environment can be suppressed by using a unified method. The echo suppression method comprises the following steps of: determining the current network transmission mode, executing echo detection corresponding to the current network transmission mode on a far-end signal and a near-end signal; and according to the detection result of the echo detection, starting an echo suppression mode corresponding to the current network transmission mode to suppress the echo in a near-end signal. The method provided by the embodiment of the invention can be adapted to diversified network environments, and is free from continuously adding new processing procedures due to variation of the network transmission mode, for example, adding an encoding procedure and a decoding procedure, and the like, so that resources are saved, and the network transmission performance can be improved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to an echo suppression method and device. Background technique [0002] In order to make full use of precious wireless bandwidth resources, the mobile communication system performs voice compression through voice codec technology. For example, Adaptive Multi-Rate (AMR) compression speech coding is widely used in Global System of Mobile communication (GSM) network, and Code Division Multiple Access (CDMA) network is widely used Apply Enhanced Variable Rate Coding (Enhanced Variable Rate Coding, EVRC) and the like. In a traditional network, the circuit domain of the core network is based on the Time-Division Multiplexing (TDM) bearer mode, and uses 64kbps Pulse Code Modulation (PCM) recording for voice coding; AMR and EVRC coding are required for transmission To convert to G.711 encoding, a speech transcoder (TransCoder, TC) is an important functional module or device to complete...

AI Technical Summary

Problems solved by technology

[0007] Due to the diversity of the network environment, there are certain problems in the network configuration of acoustic echo suppression

For example, TC has been configured in a traditional network, and an echo suppression module suitable for the time domain is configured; after the network is upgraded to support TrFO, an echo suppression module suitable for the coding domain is separately configured; when using the TFO protocol for transmission, it is necessary to Calling the echo suppression module in the time domain and coding domain consumes resources and affects transmission

In addition, because the echo suppression technology in the coding domain is not mature enough, the echo suppression technology in the coding domain cannot achieve the same quality as the echo suppression technology in the time domain, which will cause inconsistent user experience.

[0008] In other words, in a diverse network environment, an acoustic echo suppression method is only suitable for one network transmission mode. If it is applied to other network transmission modes, new processing procedures need to be added, resulting in waste of resources

For example, the time-domain echo suppression module configured in the traditional network is only applicable to the TDM mode. If the TrFO mode is directly used, the modified near-end PCM signal needs to be re-encoded, which adds an encoding process, resulting in waste of resources; For example, the echo suppression module configured for the coding domain is only applicable to the TrFO mode. If it is directly used in the TDM mode and equipped with a TC unit for transmission, it is necessary to decode the modified near-end code stream to the PCM domain, which adds a decoding process. , will also cause a waste of resources

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