The electrostatic microphone which uses the wide band obstruction filter and strengthens the tolerance for electro-static discharge

摘要

Topic This invention building in the wide band obstruction filter which can cut off the signal of the wide band which includes the low frequency and high frequency which is used for mobile communication effectively, is the purpose in it tries to being able to use the microphone with the many band.SolutionsReceiving the electric information to which in order to achieve the above-mentioned purpose, as for this invention, low cutting off frequency and high frequency interference, the sound signaling is converted with electrostatic microphone for the mobile communication terminal which makes noise decrease low in the noise microphone, is output, the field-effect transistor the drain of 30 which it expands and the field-effect transistor (D) and the source (S) with connecting with resistance and the capacitor selectively between with the above-mentioned high frequency zone, it features that it includes the wide band obstruction filter 32 which cuts off the signal of the wide band which is output from the field-effect transistor. When the removal range of EM noise is spread with the constitution which relates, simultaneously, it is possible to improve the cutoff ability for the electro-static discharge which is impressed from outside substantially.