[PD] high-frequency birdsong

[Miller Puckette]

Strange kinda bird you've got there...

If you use a standard 44K1 audio interface, everything above Nyquist gets
filtered out before conversion.  You could in principle use a 1GhZ-bandwidth
sample/hold clocked at 44K1 - this would effectively alias everything down
to audio frequencies (folded over 1e9/44100 times).  At that point, IF the
S/H is clocked at a rate that's incummensurable withth erepetition rate of
the signal you've got, you can then reassemble a non-uniformly sampled
collection of points, leaving no space between them greater than 1/(2E9)
seconds - then the sampling theorem says that you can theoretically
reconstruct trhe original signal.

Don't forget a 1gHz low-pass filter, else if the bird hits higher pitches
they will fold over :)

M

On Sun, Jun 05, 2016 at 04:47:51PM +0000, Jonathan Wilkes via Pd-list wrote:
> Hi list,Suppose a bird sings a song in a frequency range around 1gHz. (Yes, "g"Hz)
> 
> The song the bird sings is always exactly the same.
> The bird repeats its song several million times over the course 
> of an hour.
> If I record at a sampling rate of 44.1kHz below the tree in which the bird is perched, 
> for a duration of one hour, would I be able to recreate the bird's song?
> -Jonathan
> 

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