| 摘要 |
PURPOSE:To simplify a device and to speed up response to frequency fluctuation by using phase deviation due to the frequency fluctuation caused by a band- pass filter, and preventing phase deviation to be caused on the frequency fluctuation. CONSTITUTION:Phase deviation due to frequency variation produced in a band- pass filter 9 for removing a signal fed from an input terminal 1 with unnecessary noise components is branched by two routes, one pass through a 2-multiplier 10, and the other pass through a band-pass filter 11, to cancel the phase deviation caused between the both, thus outputting a carrier wave having frequency equal to frequency of an input signal completely free of phase deviation due to frequency fluctuation of every burst, on an output terminal 2. Consequently, the frequency fluctuation has no phase deviation, so the device is simplified extremely, the response to the frequency fluctuation is quickened. |
