Jonathan, I demand that you do a patch that records the first 8 bars from “And your bird can sing” from beatle`s revolver album, sampling @ < 1 hz in more than 12 hours of that loop in the speaker with a mic close to it. Salutti :)Lucarda. Mensaje telepatico asistido por maquinas.
Date: Sun, 5 Jun 2016 13:15:27 -0700 From: msp@ucsd.edu To: jancsika@yahoo.com CC: pd-list@lists.iem.at Subject: Re: [PD] high-frequency birdsong
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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