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<body class='hmmessage'><div dir='ltr'><div>Jonathan,</div><div><br></div><div>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.</div><div><br></div><div>Salutti :)</div><div>Lucarda. </div><br><font face="Courier New, Courier, Monospace" size="2">Mensaje telepatico asistido por maquinas.</font><br><br><div>> Date: Sun, 5 Jun 2016 13:15:27 -0700<br>> From: msp@ucsd.edu<br>> To: jancsika@yahoo.com<br>> CC: pd-list@lists.iem.at<br>> Subject: Re: [PD] high-frequency birdsong<br>> <br>> Strange kinda bird you've got there...<br>> <br>> If you use a standard 44K1 audio interface, everything above Nyquist gets<br>> filtered out before conversion. You could in principle use a 1GhZ-bandwidth<br>> sample/hold clocked at 44K1 - this would effectively alias everything down<br>> to audio frequencies (folded over 1e9/44100 times). At that point, IF the<br>> S/H is clocked at a rate that's incummensurable withth erepetition rate of<br>> the signal you've got, you can then reassemble a non-uniformly sampled<br>> collection of points, leaving no space between them greater than 1/(2E9)<br>> seconds - then the sampling theorem says that you can theoretically<br>> reconstruct trhe original signal.<br>> <br>> Don't forget a 1gHz low-pass filter, else if the bird hits higher pitches<br>> they will fold over :)<br>> <br>> M<br>> <br>> On Sun, Jun 05, 2016 at 04:47:51PM +0000, Jonathan Wilkes via Pd-list wrote:<br>> > Hi list,Suppose a bird sings a song in a frequency range around 1gHz. (Yes, "g"Hz)<br>> > <br>> > The song the bird sings is always exactly the same.<br>> > The bird repeats its song several million times over the course <br>> > of an hour.<br>> > If I record at a sampling rate of 44.1kHz below the tree in which the bird is perched, <br>> > for a duration of one hour, would I be able to recreate the bird's song?<br>> > -Jonathan<br>> > <br>> <br>> > _______________________________________________<br>> > Pd-list@lists.iem.at mailing list<br>> > UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list<br>> <br>> <br>> _______________________________________________<br>> Pd-list@lists.iem.at mailing list<br>> UNSUBSCRIBE and account-management -> https://lists.puredata.info/listinfo/pd-list<br></div> </div></body>
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