| 摘要 |
PURPOSE: To produce a sine wave signal with high accuracy by satisfying a specific expression for the frequency coefficient of a sine wave oscillator which carries out in sequence the multiplication and addition based on an addition theorem to produce a desired sine wave signal. CONSTITUTION: K=2.sin (π.f/P) is satisfied among sine value A(i+1) =Ai +Bi .K, cosine value B(i+1) =Bi -A(i+1) .K and frequency coefficient K respectively, where (f) and P show the set frequency and the clock frequency respectively. Then the value of the frequency (f) is inputted to a computer 1, and the coefficient K is calculated and stored in a memory 3. When the transmission controllers 6, 9, 12 and 13 are switched to (a), the output of a multiplexer 4 obtained by the coefficient K and the output of a latch 7 are inputted to an adder 5. Then the output of the adder 5 is inputted to the latch 7 and converted into new arithmetic value A(i+1) . When the controllers 6 to 13 are switched to (b), the output A(i+1) of the latch 7 is inputted to the adder 5 via the multiplier 4 and subtracted from value Bi of a latch 8. Then the output of the adder 5 is inputted to the latch 8 and converted into arithmetic value B(i+1) .
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