【摘要】 针对声传感器在复杂的音场环境下接收信号的幅度强弱相差较大的情况,利用驻极体电容式传声器、双运算放大器MC33202和若干无源器件,运用NPN三极管在饱和状态下的导电机理,研制了以低成本AGC自动增益控制放大器的声信号处理电路为核心的低噪音助听系统。实验结果表明,系统的功能电路实现效果良好,既降低了噪声,又恢复了良好的语音信号,具有较高的实用价值。更多还原

【Abstract】 In order to solve the strength difference problem of the audio signal received by microphone in the complex sound field environment,according to NPN transistor conducting principle,electrets condenser microphones,MC33202 dual operational amplifiers and a number of devices were used to design an audio signal processing circuit based on the AGC automatic gain control amplifier.The circuit facilitates a low-noise hearing aid system.The result of experiments shows that the circuit functions well: not only reduces noise,but also produces a good audio signal.It is very useful.更多还原