4 ms·
Why are the signals being multiplied together instead of added together? Multiplying them is very unusual. Even the wikipedia article linked by the site, with t
by Strilanc 9y ago
Why are the signals being multiplied together instead of added together? Multiplying them is very unusual. Even the wikipedia article linked by the site, with the text "Bringing the signals into a context for multiplying is called 'mixing' [1]", is talking about adding signals; not about multiplying them.
A bit more justification for the math being done would be good.
[1]: https://en.wikipedia.org/wiki/Frequency_mixer https://en.wikipedia.org/wiki/Frequency_mixer
- gugagore 9y agoIt is not unusual at all to multiply signals. That is how basically any modern radio transmitter and receiver works. It's also how you can convert between the frequency and time domain, which is used in basically any sort of perceptual compression (jpeg, mp3).
- elihu 9y agoActually, the frequency mixer wikipedia page is describing a kind of mixer that multiplies. The wikipedia page on "electronic mixers" is more informative: > An electronic mixer is a device that combines two or more electrical or electronic signals into one or two composite output signals. There are two basic circuits that both use the term mixer, but they are very different types of circuits: additive mixers and multiplicative mixers. https://en.wikipedia.org/wiki/Electronic_mixer https://en.wikipedia.org/wiki/Electronic_mixer This was news to me; the mixers I'm familiar with are additive. I would call something that multiplies a ring modulator or a heterodyne or something like that. The website could have been a bit more clear that they're talking about a different kind of mixer than how most people understand the term.