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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.
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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Ah ha, a piece I didn't know. I would hope the same, yes. I saw 'PC audio' and read it as 'PC speaker'. If it really is the 8253-ish-driven speaker, it's likely a bitbanging interface. If it's a soundcard and you're getting 40/60kHz out... yikes.
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Yeah, I'd expect some funky harmonics out of PC speaker tones. Would be a fun thing to record and see. Legacy ones are definitely driven via a single digital output; I wonder what happens with modern HDA setups though.
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To clarify, this is about standard PCM sound card audio, not the i8253 PC Speaker.
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mid-air collision! OK. Yeah, if there's significant > 20kHz output, something is either wrong, or intentionally stupid (eg, NOS output DAC)
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