Echo elimination method and apparatus applied to building intercom system

Abstract

The invention belongs to the technical field of voice communications and particularly relates to an echo elimination method and apparatus applied to a building intercom system. The echo elimination method comprises the following steps of initializing echo elimination processing parameters; receiving reference echo audio data; and processing to-be-processed audio data and the reference echo audio data to obtain audio data after echo elimination. According to the technical scheme provided by the method and the apparatus, the echo elimination effect can be conveniently and quickly achieved; and meanwhile, the limitation of a short delay requirement in an existing echo elimination technology is overcome, and echo elimination also can be carried out for the situation of long delay time.

Description

technical field [0001] The invention belongs to the technical field of voice communication, and in particular relates to an echo elimination method and device which can be applied to a building intercom system. Background technique [0002] At present, many companies in the building intercom industry solve the echo cancellation problem mainly by developing echo cancellation equipment on the basis of adaptive echo cancellation; but on the one hand, because each system has some different characteristics, the echo cancellation effect cannot be guaranteed. On the other hand, existing products are basically implemented by hardware, which increases the cost of the entire system virtually. Therefore, aiming at the status quo of the building intercom industry, implementing echo cancellation through software can greatly increase the scalability and practicability of the system without increasing any hardware costs. [0003] Currently the most commonly used WebRTC (Web Real-Time Comm...

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Problems solved by technology

[0003] Currently the most commonly used WebRTC (Web Real-Time Communication, web real-time communication) echo cancellation algorithm has the following disadvantages: 1) The delay is small, because the default filter length of the algorithm is divided into 12 blocks, each block is 64 points, according to 8000 samples rate, that is, 12*8ms=96ms data, and it cannot be processed beyond this length; 2) The delay jitter should be small, because the algorithm calculates the position of the reference data once by default in 10 blocks (that is, the one with the largest filter energy One piece), so if the jitter is large, it is not accurate to find the reference data, so the echo cannot be eliminated

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