Design and Implementation of a High-Precision Audio Signal Acquisition Circuit

With the rapid development of audio technology, the demand for high-precision audio signal acquisition circuits is steadily increasing. This study successfully designs a high-precision audio signal acquisition circuit by optimizing the microphone sensor, amplification circuit, and filtering design. The circuit incorporates power filtering, electromagnetic shielding, and signal isolation techniques, achieving clear long-range audio capture and high stability in complex electromagnetic environments. The performance metrics of this circuit are excellent, with a sensitivity of -19.6dB, a frequency response range of 100Hz to 10kHz, a pickup range of 5 to 6 meters, a signal-to-noise ratio of 65.3dB, a distortion rate of 0.2%, and a working current of 5.23mA. It supports both analog and differential signal outputs with low power consumption. Furthermore, through the use of an audio conversion circuit and a well-designed PCB layout, the circuit enhances anti-interference capability. This circuit has broad applications in fields such as audio recording and speech recognition, providing a high-quality signal source for subsequent audio signal processing.