"As the PC audio signal is a square wave" What? > final int SAMPLE_RATE = 40000; A 20kHz signal at 40kHz sample rate is a sine wave, not a square wave, because Nyquist. Either this guy is using a horrible sound card with aliasing, or there's harmonic distortion somewhere.
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Because a 20kHz square wave has infinite bandwidth (it's composed of an infinite number of harmonics), but 40kHz sampling can only represent up to 20kHz of bandwidth... and then you're left with the first harmonic only, which is a sine wave.
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It is if you go through a complete sample and reconstruction process intended to reproduce a bandlimited input signal. But if you're bitbanging a speaker you get a lot of the squarewave harmonics. The natural rolloff won't be the same as an antialiasing filter.
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Yeah, but this is a Java applet running on a PC, so I would *hope* the signal chain is bandlimited and the resampling in use, if any, is mostly free of harmonic distortion.
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