| 摘要 |
PROBLEM TO BE SOLVED: To provide a receiver which is composed of a small number of components and adaptive to a different transmission and reception system. SOLUTION: The FSK receiver is composed of a comparator 11, a delay unit 12, a multiplier 13, and a low-pass filter 14. The comparator 11 converts a received FSK-modulated signal into a digital signal of 1 or 0 on the basis of a specific level and outputs it and the output of the comparator 11 is inputted to a delay unit 13 and a multiplier 13. The delay unit 12 delays the input signal by a fixed time and outputs it and the delayed output signal from the delay unit 12 is also inputted to the multiplier 13. The multiplier 13 multiplies the output signal of the comparator 11 by the delayed output signal of the delay unit 12. The signal form the multiplier 13 is inputted to a low-pass filter 14 to cut its high-frequency component and then extracts its base-band signal. The receiver is usable even as an ASK receiver.
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