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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Kia‏☆‏ @alt_kia 30 Aug 2018
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      pic.twitter.com/gLXP9LOqdN

      3 replies 7 retweets 37 likes
    2. Hector Martin‏ @marcan42 30 Aug 2018
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      Replying to @alt_kia

      "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.

      2 replies 0 retweets 2 likes
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    4. Hector Martin‏ @marcan42 31 Aug 2018
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      Replying to @alt_kia

      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.

      1 reply 0 retweets 2 likes
    5. Hector Martin‏ @marcan42 31 Aug 2018
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      Replying to @marcan42 @alt_kia

      Watch @xiphmont's amazing video on this subject. He dispels all of the typical myths and misconceptions about digital audio with awesome hands-on demos. https://xiph.org/video/vid2.shtml …

      1 reply 0 retweets 7 likes
    6. Hector Martin‏ @marcan42 31 Aug 2018
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      Replying to @marcan42 @alt_kia @xiphmont

      Also I should note that the Nyquist theorem requires *excluding* exactly at half the Nyquist frequency. A 20kHz signal sampled at 40kHz is a corner case - the phase and amplitude are ambiguous, and good resampling algorithms will actually *filter out* such a signal.

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      Hector Martin‏ @marcan42 31 Aug 2018
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      Replying to @marcan42 @alt_kia @xiphmont

      So the fact that he's getting *any* output at all, at a nonstandard sample rate like 40kHz, pretty much means he's implicitly using, and relying on, some kind of crappy resampler (probably built in to Java or Windows).

      2:23 PM - 31 Aug 2018
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        1. Hector Martin‏ @marcan42 31 Aug 2018
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          Replying to @marcan42 @alt_kia @xiphmont

          * I meant exactly at half the sampling frequency (which is the Nyquist frequency).

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