 Compare LINEIN and LINEOUT and find AM demodulation is successful. The
carrier wave is 5kHz and the base band (guitar sound) has much lower frequencies.
 The last component FUNCPOLY is used to cancel the offset and magnify the
volume. The following value would be okay. Try to adjust them.  That's it for this tutorial. "Taking absolute value" -> "Low
Pass Filter" is the easiest way of AM demodulation. This technique
might be applicable on Software Radio.
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