[Arny Krueger]

"glen herrmannsfeldt" wrote in
message
Jerry Avins wrote:

(snip)

So Information Theory tells us that a quantized signal
is digital? Consider the output of the limiters in an FM
IF driving a Foster-Seely discriminator. It has two
states -- saturated and zero -- before the tank that
smooths the edges. I guess Information theory says that
FM radio is digital (maybe unless you use an Avins-Seely
ratio detector, but even those work better with at least
one limiter).

This sounds like what I previously tried to describe as
quantized but not sampled. The signal has two states,
but the transition can happen at any time.

The signal might be thought of as being quantized in the aplitude domain,
but it is clearly not quantized in the time domain. For a signal to be
quantized, it has to be fully quantized, that is quantized in both the time
domain and the amplitude domain.