[Laser] Re: Pulse Density Modulation

[Tim Toast]

I'm not sure about the absolute upper limits on strobe
tube firing rates, but you can always have more energy
per pulse at the slower rates - it's all limited by
the average power handling of the tube and power
supply. The pulse width is limited by a simple power
supply to a few 10's of microseconds and is fixed
pretty much, unless you start adding components to
shorten or lengthen it. 

here's a reviewer's article i had read about the
amplifier with PDM:
http://www.hometheaterhifi.com/volume_9_1/sharp-sm-sx100-digital-amp-1-2002.html
or google for: SM-SX100
It goes into some detail about the encoding scheme.
Not cheap price-wise exactly, but theyre selling it
for the novelty of being all digital mostly i bet. 

I had seen the term "1 bit encoding" before on cd
players and other digital items, but i always thought
that was some sort of marketing 'mistake' that had
lost something in the translation... up until
then,(early 90's?) usually you saw something like a 8,
12 or 16 bit DAC mentioned somewhere in the specs, and
to suddenly start seeing "1 bit" on things, it almost
seemed like a step down in performance. Looks can be
deceiving though.






 
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