Talk:Manchester code

So, what does this code do?

Provides a simple way of encoding arbitary binary sequences without ever having long periods where there is all one voltage, thus losing clock synchronization. Also ensures that the DC component of the encoded signal is zero. -- The Anome 12:13, 18 Sep 2004 (UTC)

Manchester code = bi-phase mark code ?

Several articles that I read (perhaps originating from the same source) use bi-phase code and Manchester code as two equivalent terms for the same encoding. The description of "Biphase Mark Coding" here on Wikipedia (http://en.wikipedia.org/wiki/Biphase_Mark_Code) seems to confirm this. A link "see also ..." on this page might be useful (or an explanation where the difference lies).

Thiadmer Riemersma

I think the Manchester graph is wrong. The correct bits or drawing should be opposite depending on how you look at it. In Manchester Encoding, a 1-bit transits from negative to positive and vice versa for 0-bit.

SA DIP 25 Swl

Actually there are two types of bit representations and the page explains that. To avoid ambiguity, I have specified the type of encoding displayed on the image. Natrij 23:59, 1 February 2006 (UTC)[reply]

I think it's important to note here somewhere that the bi-phase mark (and bi-phase space) are commonly referred to in some industries as FM1 and FM0, respectively. It's an important distinction as FM1 or FM0 (bi-phase mark or space) are easily decoded without reference to (absolute) phase at all. This simplicity exists since a transition occurs at the beginning of each bit period. This stands in contrast to Manchester encoded data where the (absolute) change of phase direction must be noted. FM0 and FM1 as common terms probably came about since they don't imply phase sensitity.

Gene Gajewski 11-Mar-2006 71.32.73.216 04:08, 12 March 2006 (UTC)[reply]