You are seeing spectrums with new input signal. See "Blackman-Harris Window"(U_5). There is a bold one around 2kHz. Next, please see "Rectangle Window"(U_1). There are two frequencies. One is 2kHz, another is 2.4kHz. Let's open a monitor for WAVIN(U_7) to check the waveform of the input signal. This wave is composed by 2kHz and 2.4kHz... The result of Rectangle Window was true!! Next

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