Intermodulation happens anytime two sources modulate. In other words anytime identical waveforms sum together creating sum and difference waves. But you also didn't grasp what I was saying earlier, the relationship between 1080p and 720p are bigger perceptional than 48k and 44.1k even on smaller size screens (I've used a lot of anime sites lol). The comparison is not so much that 1080p and 720p represent an understanding in quality, it's more so the original statement was trying to invoke a relationship of information perceived by the viewer to be more. There's the same amount of information in a 1080p as there is in a 720p screen as that relates more to bit depth to RESOLVE data. There is more information between sample rates since you are physically capturing more frequencies.orthodox wrote: ↑28 Feb 2020Intermodulation can only occur as a result of modulation, ie only when the signal is being processed. That has nothing to do with the quality of representation. If you get aliasing artifacts just from A/D conversion, this can be corrected by an LP filter before the conversion.Kalm wrote: ↑28 Feb 2020
It's not fully equal if intermodulation is occurring. Our response to reconstruction may differ anytime the quality of aliasing or anti-aliasing happens. But in visual the samething happens. They are BOTH represented by a frequency domain. In this instance it would be color and no amount perception will ever allow you to see beyond a human limited frequency domain (infrared and ultraviolet) unless filtered to our spectrum somehow. But sample best entities would be represented through bits as that is a digital construction over something like frequency which is available in nature. We capture one and distribute in the other. We capture frequency and distribute samples to define a resolution, though resolution is actually occurring in the frequency domain since we as humans have limitations.
Here is an example that shows why image and audio digital representations are totally different. If you downsample a 1080 picture to 720, then upsample them both to 4K, they will be different and look different. Buf if you downsample a 48k audio to 44.1k and then upsample them both to 192k, they will be identical sample-wise, provided the original 48k audio did not contain frequencies above 22k, which we don't hear.
But also you can't really make the statement (provided the original 48k audio did not contain frequencies above 22k, which we don't hear) without agreeing to my previous statement of intermodulation distortion that could audibly change the quality of the sound. Which means they wouldn't be perceived the same if there is another difference. If no distortion were to occur then of course it would be perceived the same as 48k has 44.1k samples or frequencies in it anyways so reconstruction can be identical.