Method and equipment for packet acoustic echo cancellation

Abstract

The invention aims at providing a method and equipment for packet acoustic echo cancellation. The method comprises the following steps: echo cancellation equipment acquiring source voice packet streams on both terminals of a phone line; determining transfer direction information corresponding to each data packet; updating target packet streams corresponding to both terminals of the phone line in an independent cache manager according to the source voice packet streams; performing PAEC (packet acoustic echo cancellation) on the target packet streams according to each data packet and the corresponding transfer direction information thereof in the target packet streams so as to acquire a cancelled echo packet stream, and then sending the cancelled echo packet stream to the corresponding terminal in both terminals of the phone line. Compared with the prior art, the bidirectional packet acoustic echo cancellation is realized, the performance of a PAEC channel is exponentially improved, the hardware number and corresponding maintenance cost are reduced; and meanwhile, the call processing and related signaling expenditure are reduced, a transparent PAEC function is provided without any signaling support; and software can be utilized for realizing the independent cache manager so as to improve the flexibility of system processing and the system efficiency.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a technique for group acoustic echo cancellation. Background technique [0002] Acoustic echo in mobile networks is caused by poorly designed cell phones or other hands-free devices, where sound from the receiver's speaker is sent to the receiver's microphone (and thus back to the sender of the voice). Acoustic Echo Cancellation (AEC) removes echoes from communication signals. Acoustic echo cancellation is the core performance to ensure the sound quality in communication. [0003] In circuit-switched networks, traditional AEC techniques have done a good job of removing acoustic echo in the waveform domain. However, there is no approved way to perform AEC in packet networks (eg voice over IP networks, VoIP). Some vendors (such as Broadcom (refer to US7333447), Samsung, 3Com, etc.) invented AEC for packet networks, but this type of AEC needs to decode the packet stream into ...

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Problems solved by technology

In a packet switching network internal switching scenario, this is undoubtedly a waste of resources

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