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From: Martin Rid <martin_riddle@verison.net>
Newsgroups: sci.electronics.design
Subject: Re:Ir remotes
Date: Mon, 20 May 2024 12:13:16 -0400 (EDT)
Organization: news.eternal-september.org
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Don Y <blockedofcourse@foo.invalid> Wrote in message:r
> My understanding is that Ir remotes modulate an Ir "carrier" signalin a particular pattern to express a particular "code" corresponding tothe key pressed/held.And, that different "chipsets" use different carriers and encodings.Is there a front-end that is tuned to the particular carrierin the receiver?  Or, is all of this done "digitally"?I.e., with a fast-enough (Ir) photodetector, should I be able todecode ANY signal from ANY "remote"?Said another way, is the fact that a particular device ONLYrecognizes a particular remote related to its use of a particularchipset (or, equivalently, decoding algorithm in software)?[The former would be hard to change but the latter should be relatively easy]

Yes, its modulated as others pointed out.
I think the Philips protocol is the most common. Played with
 decoding a hauppauge remote years ago.  I think there's a
 preamble to set the timing for 1 and 0, then the data follows.
 Pretty simple.

Cheers 
-- 


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