| 摘要 |
PURPOSE: To provide an FSK waveform generation circuit which has the general usefulness and a simple circuit constitution by eliminating the error owing to frequency assignment is 4FSK modulation or the like. CONSTITUTION: A modN computing element 2 which subjects the output of an adder 1 to remainder operation with N as the modulus is provided between an adder 1 of an integrating circuit 8 and a register 3. The output of the register 3 is set to an angleθ, and it is converted into an I-phase signal and a Q- phase signal orthogonal to each other by a cosine transformer 4 and a sine transformer 5, and a desired FSK modulation wave output is obtained by an orthogonal transformer 7.
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