Voice signal enhancement system based on rectangular microphone array

Abstract

The present invention discloses a voice signal enhancement system based on a rectangular microphone array. The system mainly comprises an N-channel microphone area array, a master control circuit, a signal conditioning circuit, an A / D collection circuit and an audio frequency amplification circuit. The signal conditioning circuit is configured to perform amplification and filtering of electric signals obtained by the microphone area array, transmit the electric signals to the A / D collection circuit, convert simulation signals output by the signal conditioning circuit to digital signals and input the digital signals to the main control circuit after serial-parallel conversion; the master control circuit is configured to transmit input signals to a network transmission module, solve a data mean value for the input signal and send the data mean value to the audio frequency amplification circuit; and the master control circuit is also configured to configured the working parameters of the system to control the operating mode and the synchronous mode of the A / D collection circuit. The system can improve the signal to noise ratio of receiving voice signals to realize enhancement of weak voice signals so as to improve the recognition degree.

Description

technical field [0001] The invention relates to signal enhancement and noise elimination, in particular to a speech signal enhancement system based on a rectangular microphone array, belonging to the fields of speech technology and signal processing technology. Background technique [0002] With the development of intelligent voice recognition technology, voice signals need to be collected in real time and accurately, and the requirements for voice reproduction of microphones are getting higher and higher. Due to the complexity of the voice environment, the voice collected by a single microphone tends to be attenuated greatly and accompanied by a lot of interference. The voice acquisition method based on the microphone array can realize accurate signal acquisition and enhance the signal-to-noise ratio of the voice signal. The microphone array is used for voice collection, which is to arrange multiple microphones according to a certain geometric structure, and use the spatia...

AI Technical Summary

Problems solved by technology

Second, AD collection synchronization problem

This method is greatly restricted by the collection equipment, so the usage scenarios are very limited

In recent years, some relatively mature acquisition and processing systems based on microphone arrays have also appeared. Due to the limitation of the number of array elements and formation, these systems can only work at relatively short distances, and have no ability to restore speech signals with large attenuation. Unable to meet various needs

Images