Can somebody give me a rather detailed explenation about modulation (fase,
frequency and amplitude - modulation !) ?

Also can somebody tell me what kind of modulation an IR-signal uses ??
(IR-signal ---> I mean the IR-standard of Sony : SIRCS !) I know they use
pulse-width coding :

When using such an IR-signal is looks like this :

1. GUIDEPULS (Signal high during 2,4 ms)
2. DATA OFF TIME (Signal low during 0,6 ms)
3. ZERO represented by 0,6 ms low signal
4. ONE represented by 1,2 ms high signal

(A ONE or ZERO is always followed by a DATA OFF TIME)
                              __
The carrier is a _|     |_ with a frequency of 40 kHz !

So, you get a signal containing pulses with a different width !! I want to
know what form of modulation this is ?? (Think is fase modulation, but don't
know why ?)

Any ideas ?

Greetings from Glenn Goovaerts from Belgium