What is DSP equivalent of Planck's constant?"

My original title was going to be approximately
   Murky region between "Fourier Series" and "Fourier Transform"

Think there should be a similarly simple title with "periodic" ;/

I suspect that deep down I see the FFT as just a convenient 
method to calculate a 'Fourier Series' valid over a specified 
time period.

On Feb 28, 3:38&#4294967295;pm, Richard Owlett <rowl...@pcnetinc.com> asked:

What is DSP equivalent of Planck's constant?

How about 1 or 2 or 1/2pi or 1/4pi depending
on who you talk to, whether you measure
frequencies in radians/second or Hertz, and
how you define the time duration and bandwidth
of a signal.  This is the minimum value of the
time-bandwidth product of a signal, and resembles
the uncertainty principle dx.dp >= h/4pi where h
is the (unnormalized) Planck's constant.

There was a discussion about this matter in
comp.dsp about six months ago.

--Dilip Sarwate