| 摘要 |
PURPOSE:To make an equipment constitution small and to facilitate manufacture by using a couple of ominidirectinal microphone units and applying a prescribed signal processing to outputs from the microphone units so as to obtain 1st and 2nd channel signals. CONSTITUTION:An output from a 1st microphone unit M1 is fed to a noninverting input terminal of a 1st subtractor 1 and fed to an inverting input terminal of a 2nd subtractor via a 1st delay circuit 2. An output from a 2nd microphone unit M2 is fed to a noninverting input terminal of a 2nd subtractor 3 and fed to an inverting input terminal of the 1st subtractor via a 2nd delay circuit 4. Then 1st and 2nd channel signals are obtained via output terminals 5, 6 of both the subtractors 1, 3. Thus, the microphone equipment is used as a stereo microphone equipment. Then the design and manufacture of the equipment is easier than a unidirectional microphone unit. |
