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On Thu, 2007-05-17 at 09:33 -0300, Gerhard Fiedler wrote:

> I'm not sure I'm confusing things :)  I know that there is state
> information in the Manchester stream, in that only certain states are
> permitted. But that's also true for the PWM stream.

Maybe an illustration will make things clearer. In the attached figure,
the 5-bit pulse stream of 11000 is encoded with PWM and Manchester. Single
bit errors in PWM still produce a valid PWM data stream. However, single
bit errors in Manchester produce illegal Manchester streams. All the pulse
in the erroneous Manchester streams are the correct width. However, if
state information is not retained from the previous pulses then it's not
possible to recognize the erroneous encoding.

Scott
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