| 摘要 |
PURPOSE:To obtain a stable and miniaturized frequency fluctuation correcting circuit with less characteristic fluctuation by correcting a frequency fluctuation included in a digital signal after a converting a signal whose frequency fluctuation is to be corrected into the digital signal. CONSTITUTION:A base band signal x(t) via an input terminal 1 and a signal v(t) representing a frequency fluctuation DELTAf via an input terminal 9 are inputted respectively to A/D converters 11, 12, and after they are converted into digital signals, the result is inputted to phase shifters 13, 14 shifting digitally the phase by 90 deg. on the time axis. A multiplier 15 multiplies outputs of the converters 11, 12 and a multiplier 16 multiplies outputs of the phase shifters 13, 14. The output of the multipliers 15, 16 is inputted to an adder 17, where it is added and converted into an analog signal by a D/A converter 18 and outputted from an output terminal 8 as the signal subject to frequency fluctuation correction. |
