An Efficient Method Applied to Pick-up Audio Signal from Strong Noise Environment

摘要

The study, which focuses on an environment of strong noise source in the audio frequency, is how to pick-up the audio signal by using the traditional electronic technology. The process which deals with signals including noise and audio signals by using the circuit, such as impedance transforming circuit, logarithmic amplifier and active power filter, are used in improving SNR(signal-to-noise ratio). Finally, the effect which lows noise power and remain audio signals is obvious.