Method and device for echo cancellation

Abstract

The present application discloses an echo cancellation method and device, the method comprising: updating the parameters of the cloud echo cancellation system at the first moment by using a first reference signal, the first reference signal being the voice of the cloud server responding to the first user instruction Synthesis result; at the second moment after the first moment, if the microphone signal and the target reference signal uploaded by the client are received, the echo cancellation system is used to cancel the microphone signal by using the target reference signal through the cloud echo cancellation system. It can be seen that since the cloud echo cancellation can use a more complex echo cancellation algorithm than the local echo cancellation algorithm and pre-estimate the parameters of the echo cancellation filter, it can have a better echo cancellation effect when performing echo cancellation on the microphone signal.

Description

technical field [0001] The present application relates to the technical field of echo cancellation, and in particular to an echo cancellation method and device. Background technique [0002] In the process of human-computer interaction, after the machine receives user requests (such as voice, text, touch, etc.), it will make corresponding processing according to the user request information, and finally feedback the processing results to the user. Among them, the prompt broadcast is one of the most effective and convenient ways for the machine to feed back information to the user. In the existing various human-computer interaction products, the application of prompting the user through the prompt broadcast is the most widely used, especially in the vehicle environment. , in order to ensure the safety of the driving process, it is particularly important for the user to receive feedback information in the form of hearing during the driving process. [0003] In fact, most of t...

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Problems solved by technology

[0004] However, the user interaction voice is recorded by the microphone of the car. At the same time, the microphone will also record the prompt (ie echo signal). In order to ensure the success rate of the interaction, the recorded prompt needs to be recorded from the signal recorded by the microphone. However, the prompts are usually audio synthesized by a text-to-speech (Text To Speech, TTS) synthesis system, and the prompts contain relatively little frequency band information, and compared to the long-term user In terms of interaction, the prompts are short and changeable and sudden. Therefore, the existing echo cancellation technology has a poor echo cancellation effect on the prompts, which will inevitably lead to a decrease in the success rate of the user's secondary interaction.

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