| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a capacitor microphone the output sensitivity of which is enhanced by connecting a plurality of capacitor microphone units in series, while simplifying the circuitry.SOLUTION: A capacitor microphone unit U1 on the prestage side excepting the final stage is connected with a resistive element R1, as a load circuit by a passive element. Consequently, an audio signal by the capacitor microphone unit U1 is generated in the resistive element R1 constituting the load circuit. A capacitor microphone unit U2 on the final stage is connected with an impedance converter using an active element, and the audio signals from the capacitor microphone units U1, U2 are added in phase, and outputted from the impedance converter 3 using the active element in the final stage.</p> |
