In the modulator side (whether PPM, PWM, PCM, or Delta Modulation) , a specific timeslot is alloted for one discrete level right? So, lets say i have 8 discrete levels and i have to represent them in bits ( so i'll need 3 bits). If i am going to transmit one discrete level, i have to send the 3 bits serially ( MSB or LSB first? ).
Now, in the demodulator / decoder side, how does one distinguish this group of 3 bits from the other 3 bits that represent another discrete level? Is there some kind of a synchronization like a clock that is transmitted together with the pulse modulated signal?
thanks. i could really use some help