| 摘要 |
PROBLEM TO BE SOLVED: To connect a handset using a polarized microphone with a telephone set regardless of polarity, and to make the microphone itself non-polarized. SOLUTION: In a voice input processing unit compatible with a polarized microphone, microphone input terminals T1 and T2 of the telephone set 10 and terminals T3 and T4 of the handset 40a are connected by connecting cables 20 and 21. A polarized capacitor microphone 31b and a polarity coincidence circuit 41a which are mounted on a printed circuit board 41 are connected within the printed circuit board. The terminals T3 and T4 and terminals INA and INB of the polarity coincidence circuit 42a are connected by connecting cables 22a and 23a. The polarity coincidence circuit 42a composes a diode bridge. The terminals T1 and T2 of the telephone set 10 and the terminals INA and INB of the polarity coincidence circuit 42a can be connected regardless of the polarity. COPYRIGHT: (C)2007,JPO&INPIT
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