| 摘要 |
<p>PURPOSE:To secure the good talking with virtually no noise even in the strong wind by securing a connection between the microphone element with the output impedance set to 50-10OMEGA and the amplifier with the input impedance set to 10- 30 times as high as the output impedance. CONSTITUTION:The strong wind pressure received from the back flows outside owing to taper part 10 formed at the front periphery of frame body 3, and furthermore the direct current wave action caused by the wind from the front hardly reaches diaphragm 11 due to the face put close to outside protective network 8. Even in case the wave action reaches the diaphragm, the diaphragm has just a slight vibration owing to existence of compressed foam 6. At the same time, virtually no electromotive force is caused since the output impedance of mobile coil 1 features 50-10OMEGA, thus causing no noise by the wind pressure. The voice uttered from the mouth close to the front face causes the alternating current vibration which vibrates diaphragm 11 after transmitting through foam 9. Thus the alternating aural current is caused to coil 1, but the vibration of diaphragm 11 is not virtually affected by the aural current owing to foam 6. In addition, the input impedance of the amplifier features 10-30 times as high as the output impedance of element 2, thus ensuring the good talking without any noise caused.</p> |
