Patent ID: 6961436

Claim:
A noise-protecting arrangement for ear protector, comprising: an audio-frequency receiving unit, which is a capacitor microphone for receiving an external audio signal; a first audio-frequency amplifying unit for amplifying the audio signal received by said audio-frequency receiving unit; a volume control amplifying unit for further amplifying the audio signal having been amplified by said first audio-frequency amplifying unit; a current amplifying unit for processing the audio signal received from said volume control amplifying unit, so that the audio signal processed, converted, and output by said current amplifying unit is of 85 dB, which is equivalent to an audio signal of 0.6V; a gain control signal unit for processing the 0.6V audio signal output from said current amplifying unit, so that the audio signal processed, converted, and output by said gain control signal unit is a control signal of 0V; an impedance matching unit for matching the audio signal having been amplified by said first audio-frequency amplifying unit, so that said amplified audio signal is given an impedance to reduce loss of the audio signal; a gain control unit, which is a field effect transistor (FET) and is energized when the audio signal processed, converted, and output by said gain control signal unit to said gain control unit is a control signal of 0V, so that the audio signal amplified by said impedance matching unit is attenuated at a gain adjusting unit and then passes through a volume regulating unit; a volume regulating unit, which is a variable resistance for regulating an intensity of the audio signal passed through said impedance matching unit and thereby controlling high and low of volume of the audio signal being output; a second audio-frequency amplifying unit for amplifying the audio signal having been regulated by said volume regulating unit; and an audio-frequency output unit, which is a loudspeaker, at where the audio signal received by said audio-frequency receiving unit and processed by said second audio-frequency amplifying unit may be heard.