 So we put RMZLPF(U_5), that is an FIR Low Pass Filter designed by Remez
Algorithm. Open a monitor for that.
The frequency response is drawn like this. We can remove the frequencies
bigger than 600Hz by this.
Then "Open a Monitor" for FFTMON(U_7).
Unnecessary frequencies have decreased a lot.
See how the series of data has changed by opening a monitor for TXTOUT(U_9).
You may see 400Hz of sine wave has been interpolated in good shape!! (The
delay is caused by the FIR filter) However, its magnitude is somewhat decreased...
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