| 摘要 |
PURPOSE:To decrease the effect of noise mixed from a curl cord during calling by providing an amplifier in a handset main body in a telephone set using a capacitor electric microphone as a transmitter microphone. CONSTITUTION:The capacitor electric microphone is used as the transmitter microphone 7, and an amplifier with high input impedance and a low output impedance is used as an amplifier 4 and they are provided in the handset main body 6. Further, the voice of the user is inputted to the transmitter microphone 7 with respect to the transmission, and after the voice is amplified by an amplifier 3, the voice is transmitted to a telephone set main body 1 via the curl cord 9. Thus, the signal level passing through the curl cord 9 is comparatively large and the noise from the curl cord is reduced effectively. |
