[sdiy] "Ghost" Electronics

[Martin Czech]

:::I would not use PLL techniques. If you could square up the recovered
:::audio, use the PV-1 pitch to voltage converter... Penalty of divide by 2 in 
:::frequency... but it will track very accurately and with the minimum of 
:::ripple. It "could" staircase at low frequencies, but you could filter that 
:::with only 10% of what a loop filter would need to be. TomG still has some 
:::circuit boards for the unit. I never thought
:::of using it like this. Great Idea.

Great idea. If the voltage range of interest is coded as a 5000-15000 Hz
sine wave (linear tri or sine wave osc. needed), why
shouldn't that work with nice ripple rejection?
I think the vco frequency must be way higher then that of the signal to
be recorded, less sidebands, less ripple, like in fm radio.

Am I missing something?
m.c.