Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Martin Rid Newsgroups: sci.electronics.design Subject: Re:Ir remotes Date: Mon, 20 May 2024 12:13:16 -0400 (EDT) Organization: news.eternal-september.org Lines: 15 Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Injection-Date: Mon, 20 May 2024 18:13:18 +0200 (CEST) Injection-Info: dont-email.me; posting-host="5222414fae1f2ba1e74940bd0f962ccb"; logging-data="87423"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19zqjYxhTNS07ZkXRUVVwY8" Cancel-Lock: sha1:XtoNIJ7INYVoCNil2X5LJFQ+S38= X-Newsreader: PiaoHong.Usenet.Client.Free:2.02 Bytes: 2030 Don Y 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 -- ----Android NewsGroup Reader---- https://piaohong.s3-us-west-2.amazonaws.com/usenet/index.html