发明名称 VIDEO CAMERA WITH MICROPHONE
摘要 A video camera with a microphone having controllable directivity characteristics to an object in synchronism with focusing of the video camera to the object. The microphone is an optical microphone (300) comprising a diaphragm (2) vibrating with sound pressure, a light source (3) for irradiating the diaphragm (2) with a light beam, a photodetector (5) for receiving part of the light beam reflected from the diaphragm (2) and outputting a signal corresponding to the vibration of the diaphragm, a circuit (13) for driving the light source (3) by supplying a predetermined current, and a negative feedback circuit (100) for supplying a part of the signal outputted from the photodetector (5) to the light source driving circuit (13) as a negative feedback signal. The directivity characteristics of the optical microphone (300) are controlled by varying the magnitude of the negative feedback signal with a zooming signal indicative of the zooming amount of the video camera with respect to the object.
申请公布号 WO0128285(A1) 申请公布日期 2001.04.19
申请号 WO2000JP07170 申请日期 2000.10.16
申请人 PHONE-OR LTD.;PARITSKY, ALEXANDER;KOTS, ALEXANDER;KOBAYASHI, OKIHIRO;MIYAHARA, NOBUHIRO;SATO, HACHIRO 发明人 KOTS, ALEXANDER;KOBAYASHI, OKIHIRO;MIYAHARA, NOBUHIRO;SATO, HACHIRO
分类号 G11B33/06;G11B33/12;H04N5/232;H04R1/02;H04R3/00;H04R23/00;(IPC1-7):H04R3/00;H04N5/225 主分类号 G11B33/06
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