Patent ID: 6226386
Filing Date: 2001-05-01
Classification: H04R

Abstract:
A microphone provided with a tubular casing having a sound inlet; a transducer unit provided in said tubular casing for converting acoustic output which is transmitted form an external source through said acoustic inlet, the transducer unit including one or more oscillating elements; support means for elastically supporting the transducer unit; and output means for outputting electric signals transmitted from said transducer unit to outside, said microphone including:oscillation-detecting means for detecting unnecessary oscillatory waves which are transmitted to said one or more oscillation elements; andnoise control means for attenuating noise component contained in said electric signal which is output from said output means, base on an oscillation-detecting signal which is output from said oscillation-detecting means, said noise control means including an amplifier for amplifying the oscillation-detecting output signal from said oscillation-detecting signal therefrom;a wave detector for wave-detecting the amplified oscillation-detecting input signal of the amplifier to output the wave-detecting input signal of the amplifier to output the wave-detecting signal therefrom;a smoothing circuit for smoothing the wave-detecting output signal from said wave-detector to output the smoothed wave-detecting signal therefrom;a computer for comparing the smoothed signal with a reference input level which is previously set, and outputting a driving signal therefrom, when said smoothing signal is input thereinto at higher level than the reference level;a switch for making and breaking a circuit connected therewith;attenuation means which is controlled by said switch means so as to attenuate the noise component contained in the electric output signal from said transducer unit, when the making of the switch is actuated.