| 摘要 |
The present invention relates to a canal type earphone with a noise collecting function. The earphone converts an electric signal outputted from a portable device (A) into a sound signal and includes a microphone (10) for collecting noise, an amplifier (20, 30) which amplifies the noise collected by the microphone for collecting the noise, and a variable resistor (Vr) which controls the amplification rate of the amplifier. |
