2results about How to "Cancel echo" patented technology

This application provides an echo cancellation system, method, and device based on a complete reference signal on the server side, applicable to the field of audio processing technology. The system of this application uses the original audio sample from the client, stored on the server side, as a precise reference signal. When returning the output audio signal to the client, the server has already subtracted the client's corresponding reference signal from the globally mixed audio, thereby eliminating the client's voice and preventing the client user from hearing their own voice, thus achieving echo cancellation. Compared to existing technologies where echo cancellation is achieved by the client estimating the echo using AEC technology, the system of this application leverages the server's possession of a complete reference signal to achieve echo cancellation, reducing complexity while ensuring the accuracy of echo cancellation.

This invention relates to the field of electronic microphone audio signal processing technology, and provides an electronic microphone audio signal processing system and method, including a server connected to a signal acquisition module, a digital signal processing module, a digital-to-analog converter module, and an output module. The signal acquisition module includes a sound sensor, an analog front-end, and an analog-to-digital converter. The sound sensor uses a MEMS microphone array to convert changes in sound wave pressure into analog electrical signals. The analog front-end internally includes a preamplifier, a bias circuit, and an anti-aliasing filter. The preamplifier amplifies the electrical signal output by the microphone. The anti-aliasing filter filters out high-frequency components above the Nyquist frequency before analog-to-digital conversion, preventing aliasing distortion. This invention can process digital audio signals in real time and accurately, effectively eliminating echo, suppressing noise, stabilizing volume, and improving speech clarity and sound quality, greatly improving the audio signal processing quality of electronic microphones.