| 摘要 |
PROBLEM TO BE SOLVED: To provide an electret condenser microphone(ECM) where the entire microphone is made small and the effect of high frequency noise elimination is enhanced. SOLUTION: In the ECM for a communication apparatus used for a plurality of frequency bands, an impedance conversion element to convert an impedance of the ECM and a plurality of integrated high frequency noise countermeasure laminated ceramic capacitors 10a, 10b are mounted on a printed circuit board, and this printed circuit board is contained in a case together with the ECM. Since a plurality of the laminated ceramic capacitors 10a, 10b are integrated, they are mounted without the need for a wide space, the printed circuit board has a large earth area and the entire configuration is made small in size and light in weight.
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