 "Tools" -> "LINEOUT Begin" to re-start the sound.
See the spectrum and find the 1kHz has disappeared by the notch filter!!
You can double-click on NOTCH, then click "Change Parameters"
and see its cutoff frequency (Fc) is 1000. If you want to eliminate 2kHz,
just change Fc to 2000. This sound includes 2kHz, and this does 500Hz. Please try them, too.
You can also see Time-domain signals by double-clicking LINEIN/OUT then
"Change Parameters".
That's it for this class. Real-Time filtering has become possible by LINEIN/OUT
components. I will try Real-Time AM Demodulation next time. See you again...
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