Is PCM a preferred modulation for analog data transmission

[special]

Hello,
I have been reading through some material on Digital Communications. I have a doubt when I came across Pulse Code modulation. Is it the only form of pulse modulation that is suitable for analog data transmission. Any kind of inputs would be helpful. Thanks.

 

[nbucska]

If you don't want to digitize - i.e. you must/want to transmit in analog form -- your only choices are DC
or AC -- with amplitude, phase, frequency modulation. --

The Pulse modulation is a variety of AC . You can use pulse
width, frequency or phase modulation.

The choice is not simple - you have to know the noise, its
properties, required accuracy etc.

Do you want to transmit by wire,IR by air or fiber or RF ? what is the distance? What king of accuracy ? cost consideration ? Circuit size limits?

<nbucska@pcperipherals.com>