3results about How to "Cancel echo" patented technology

The invention discloses an LED lifesaving lighting wire coil and a control method thereof.The LED lifesaving lighting wire coil comprises a wire coil support used for installing and fixing the whole wire coil, a winding roll assembly is detachably and rotatably installed on the wire coil support and used for winding and unwinding a lighting wire harness wound on the outer wall, and a communication assembly is detachably installed on one side of the wire coil support and used for communicating with the winding roll assembly. The wire coil assembly is detachably installed on the outer wall of the wire coil assembly and electrically connected with the lighting wire harness wound on the outer wall of the wire coil assembly so as to guarantee signal stability in work, and the operation panel is detachably installed on the end face of the wire coil assembly and used for conducting power source on-off operation on the whole wire coil. The LED lamp is arranged in the wire harness on the wire coil, so that the wire harness can play a lighting role in the use process of optical fiber transmission signals, rescue workers can conveniently guide crowds to be rapidly evacuated during rescue, a wireless and wired mixed communication mode is adopted, the communication blind area in a complex building can be covered, and the communication efficiency is improved. And the personal safety of workers is ensured.

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.