Re:24/192 Music Downloads Are Very Silly Indeed (2012)
by dom0 on Wednesday August 30, 2017 @04:03AM
(#15130464)
> The difference is audio is "actually" bandlimited and frequency-based, but images are "actually" spatial.
I.e. audio is sampled along one dimension, while images are sampled along two dimensions. Note that frequency-domain considerations play a crucial role in all optical design, including imaging sensors.
Re:24/192 Music Downloads Are Very Silly Indeed (2012)
by astrange on Wednesday August 30, 2017 @11:02PM
(#15137871)
It's a little more than that. A sine wave originates in the frequency domain but actually sounds like something, but images originating in the frequency domain are just noise and not pictures of anything.
The difference is audio is "actually" bandlimited and frequency-based, but images are "actually" spatial. When you try using frequency math on images you get artifacts called ringing, which are easy to see with JPEGs or sharp scalers like Lanczos.
Of course audio isn't really frequency-based either, or else it would just be one sound repeated forever. So there's still ringing artifacts (called "pre-echo") and cymbals are the first to go in an MP3.