公开(公告)号：US20020080241A1

公开(公告)日：2002-06-27

申请号：US09883058

申请日：2001-06-14

Applicant: PHONE-OR LTD.

Inventor： Alexander Paritsky ,  Alexander Kots ,  Okihiro Kobayashi ,  Nobuhiro Miyahara ,  Hachiro Sato

IPC: H04N005/225

CPC classification number: H04R23/008 ,  H04N5/232

Abstract: 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.

Abstract translation: 具有麦克风的摄像机具有与摄像机对准物体同步的对象的可控指向性特征。 麦克风是包括用声压振动的隔膜（2）的光学麦克风（300），用光束照射隔膜（2）的光源（3），用于接收光束的一部分的光电检测器 从光阑（2）反射并输出与光阑振动相对应的信号，用于通过提供预定电流驱动光源（3）的电路（13），以及用于提供部件的负反馈电路（100） 从光检测器（5）输出到光源驱动电路（13）的信号作为负反馈信号。 通过用指示摄像机相对于物体的变焦量的变焦信号来改变负反馈信号的幅度来控制光学麦克风（300）的方向性特性。