Howling preventing inductive receiver |
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| 申请号 | JP9200878 | 申请日 | 1978-07-27 | 公开(公告)号 | JPS5518186A | 公开(公告)日 | 1980-02-08 |
| 申请人 | Sony Corp; | 发明人 | SUGITA JIYUNKICHI; FUSE YUUZOU; | ||||
| 摘要 | PURPOSE: To secure an assured detection of the distance between the transmitter and receiver by compounding the signals induced at the reception coil and thus to prevent the howling occurrence in case several speakers are installed within a meeting place and hearing the participant's speech through the microphone for loud speaking through the speaker. CONSTITUTION: Coils 12A and 12B are mounted to cores 11A and 11B which cross orthogonally to each other and then installed within speaker box 1, and inductive magnetic flux H is given to coils 12A and 12B from transmission coil 5 provided near mike 2. The wavelength of the signal given from coil 5 is set longer enough than the distance of the reception side, thus securing the same phase or the opposite phase for the voltage induced at coils 12A and 12B. Either one of 12A and 12B is added to adder 14 via 90°-phase shifter 13 to be added with the output of the other coil. And the added output is detected by detector 16, and the variation of the distance is detected assuredly between the transmitter and the receiver. Thus, the occurrence of howling can be prevented. COPYRIGHT: (C)1980,JPO&Japio |
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