Helpfile B.14.sampler.rockafella may be a good place to start.
On Mon, 5 Mar 2007 14:15:26 -0600 "Mike McGonagle" mjmogo@gmail.com wrote:
I don't want to change the subject (and if needed, we can start a new thread), but as this might be a related topic, here it is...
What would it take to turn this into a "Slowdown" abstraction? Basically, I am interested in slowing down the tempo of a sound, but NOT changing the pitch...
Am I off-base on this? Or can this be used as the starting point for what I described?
Thanks,
Mike
On 3/5/07, Frank Barknecht fbar@footils.org wrote:
Hallo, Kyle Klipowicz hat gesagt: // Kyle Klipowicz wrote:
Could aliasing be avoided by using a multi-pole low pass filter at nyquist before sending the signal to the dac?
No: Alias frequencies aren't too high, they are wrong frequencies, that have been mirrored at the Nyquist border. As soon as you try to play a sinewave at Nyquist + x, what you get is a sine at Nyquist - x, and you cannot lowpass out this frequency after it has been introduced.
You can however upsample your signal first, then use a lowpass filter, then downsample again. See this chapter in The Book for more info: http://crca.ucsd.edu/~msp/techniques/latest/book-html/node194.html and J07.oversampling.pd
Ciao
Frank Barknecht _ ______footils.org_ __goto10.org__
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
-- Help the Environment, Plant a Bush back in Texas!
"I place economy among the first and most important republican virtues, and public debt as the greatest of the dangers to be feared. To preserve our independence, we must not let our rulers load us with perpetual debt." -- Thomas Jefferson, third US president, architect and author (1743-1826)
"Give Peace a Chance" -- John Lennon (9 October 1940 _ 8 December 1980)
Peace may sound simple_one beautiful word_ but it requires everything we have, every quality, every strength, every dream, every high ideal. _Yehudi Menuhin (1916_1999), musician
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list