| 摘要 |
PURPOSE:To realize a simplified structure as well as a miniature size for the wireless microphone by performing FM through variation of the resonance impedance of the oscillator circuit via the acoustic wave. CONSTITUTION:With vibration of electrode 3 via the acoustic wave, electrostatic capacity C1 changes between electrode 3 and 4. Accordingly, the frequency of the resonance circuit comprising capacity C1 and C2 plus coil L1 changes, and the oscillation frequency receives application of FM. |
