The only way to claim that "most remote controls are based on Manchester code" is to decide that Philips remote controls are the most widely used. It is my experience that IR coding format known as RC5 or later variants of it RC6 and RC7 are specific to Philips equipment and the companion remote controls. Of course Philips in Eindhoven in the Netherlands has an active OEM design center that makes RCx type remote controllers for other OEMs, but they generally do not prefer to support OEMs that are in direct competition with other equipment that Philips also manufactures.

The other used types of remote controls in wide use (and certainly probably much greater distribution) use the various other formats including NEC format, SONY format and even something called RECS-80 format. I myself have encountered and worked with no less than a dozen or more formats (some similar and some very different).

I have also encountered the use of Manchester encoded IR transmission in one other IR remote control system. The controls from this company ( http://www.interlinkelec.com/ ) are setup to use the NEC protocol for the "normal" buttons and use a vendor specific variant of RC6 for the high speed transmissions that come from the pressure sensitive X/Y thumb rocker. Hunt for the pulldown product selector and find the IRC-Model:TC Remote control page. (I OEMed that product for one project I worked on).


Just setting the record straight as I know it.
Michael Karas