PCM=PWM?

[Rob]

Is it true that pulse code modulation is the SAME as pulse width
modulation?
I always thought this was true, that the pulse code modulation just took
a simple square wave, and by shaping the pulse very quickly was able to
churn out sampled sounds..Basically, radically and quickly modulating
the pulse width of an existing wave form to generate all the needed
harmonics and such.

Rob