28 Jan
2005
28 Jan
'05
3:38 p.m.
The other suggestions should good, but alternatively
you write a patch in Pure Data to do this, using the
built-in object fiddle~, which estimates pitch (fairly
accurate with tweaking) and a LADSPA pitch shifter
(the best I've found is pitchScaleHQ from the
collection at www.plugin.org.uk). PD takes a while to
learn how to use, but once you have it's great for
doing stuff like this quickly.
Stefan Turner
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28 Jan
28 Jan
4:20 p.m.
On Fri, 28 Jan, 2005 at 07:38PM +0000, Stefan Turner spake thus:
The other suggestions should good, but alternatively
you write a patch in Pure Data to do this, using the
built-in object fiddle~, which estimates pitch (fairly
accurate with tweaking) and a LADSPA pitch shifter
(the best I've found is pitchScaleHQ from the
collection at www.plugin.org.uk). PD takes a while to
learn how to use, but once you have it's great for
doing stuff like this quickly.
Thanks for the advice.
I've never used pd - can I use it to make a LADSPA plugin or
standalone app, or do I have to run it managed?
Stefan Turner
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--
"I'd crawl over an acre of 'Visual This++' and 'Integrated
Development
That' to get to gcc, Emacs, and gdb. Thank you."
(By Vance Petree, Virginia Power)
29 Jan
29 Jan
11:17 a.m.
Stefan Turner <stefan_turner(a)yahoo.co.uk> writes:
The other suggestions should good, but alternatively
you write a patch in Pure Data to do this, using the
built-in object fiddle~, which estimates pitch (fairly
accurate with tweaking) and a LADSPA pitch shifter
(the best I've found is pitchScaleHQ from the
collection at www.plugin.org.uk). PD takes a while to
learn how to use, but once you have it's great for
doing stuff like this quickly.
Note that SuperCollider can do this as well, as long as you are limiting
the requirements to monophony. I guess that would hold for
Pd as well anyway. And its a *very* simple patch!
s.boot;
(
{ var signal, freq, hasFreq, newFreq;
signal = AudioIn.ar(1);
# freq, hasFreq = Pitch.kr(signal, ampThreshold: 0.02, median: 7);
newFreq = freq.cpsmidi.round(hasFreq).midicps;
PitchShift.ar(signal,
0.1, // grain size
newFreq/freq, // ratio
0, // pitch dispersion
0.004 // time dispersion
)
}.play(s);
)
That is all you need. Use this with a guitar as input, and try
to slide or vibrato. It will always correct to the nearest semitone.
Note how nicely SuperColliders language can be used to capture the underlying
idea. If hasFreq is 0 (i.e., Pitch has no idea what freq the signal has),
round does not do anything. If hasFreq is 1, newFreq
will be rounded to the nearest semitone, automagically.
--
CYa,
Mario
12:20 p.m.
On Sat, Jan 29, 2005 at 04:17:52PM +0100, Mario Lang wrote:
Note that SuperCollider can do this as well, as long
as you are limiting
the requirements to monophony. I guess that would hold for
Pd as well anyway. And its a *very* simple patch!
Neat !
I was wondering how to do the
newFreq = freq.cpsmidi.round(hasFreq).midicps;
but as you say, it's simple enough !
--
Fons
7193
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3 comments
4 participants
participants (4)
-
Fons Adriaensen -
james＠dis-dot-dat.net -
Mario Lang -
Stefan Turner