| 摘要 |
PURPOSE:To simplify the circuit constitution, by calibrating and demodulating the analog signal into a normal value at the reception side, by feeding the reference signal simultaneously with the analog quantity. CONSTITUTION:The output of the analog signal generators 34a to 34c is fed to the optical fibers 37a to 37d of the photo delivery cable 32 via the photo electric converters 36a to 36c and the output of the reference signal gnerator 35 is via the photo electric conversion unit 36d. At the reception end 33, the analog signal is fed to the calibration units 39a to 39c via the photo electric converters 38a to 38d, the refernce signal is fed to the calibration signal generator 40, developing the reciprocal signal of the attenuation of the reference signal, and this output is fed to the calibration unit and it is multiplied with the analog signal. As a result, the amount of attenuation of the analog signal accompanying the timely veriation is corrected and it is reconstituted with the delivery signal accurately at the analog signal receivers 41a to 41c. |
