| 摘要 |
PURPOSE:To improve the sensitivity of the transducer with simple constitution. CONSTITUTION:This transducer has a positive feedback loop which feeds the output of an impedance converting circuit composed of the resistance 2 and FET 3 of a microphone unit 1 back to the microphone unit 1, and the output signal from the impedance converting circuit is inputted to the micropnone unit 1 together with a speech input signal by superposition. The microphone unit 1 is excited while at least the output signal component from the impedance converting circuit is added, thereby improving the sensitivity of the transducer. |
