the software that came with my Sony digital recorder ICD-P320 does this
trick. The device will record more than 20 hours. The listener can speed up
the playback, the pitch never changes.
KE4MZ, Brent
Dothan, AL
bg...@comcast.net
www.wb4zpi.org
- Original Message -
From: expeditionradio expeditionra...@yahoo.com
To: digitalradio@yahoogroups.com
Sent: Tuesday, January 27, 2009 3:34 AM
Subject: [digitalradio] Re: Real time audio frequency multiplication sofware
Such devices have been used in music industry, especially vocals,
guitars, and other instruments.
They have been variously known as pitch shifters, pitch scalers, or
harmonizers. This function has become a feature in multi-effects
boxes for electronic music instruments, recording, and live sound
processing.
It is done by changing the rescan rate of digitized audio, and some
other syncro tricks, and the effect is most recently accomplished in
real time with a good DSP engine (or several).
The technique for audio timescale pitch modification is used in
voice commercials (spots), usually the legal fine print disclaimer
heard very fast at the end of the spot. The voice is sped up, but the
pitch is then adjusted back lower to the original speed.
In my recording studio, I have a DSP multi-effects rack-mount device
(with 3 DSP engines in it) that has a pitch change feature, selectable
as one of the many presets, and various parameters can be adjusted
with a menu, such as octave, percent, or relative pitch change
up/down. Perhaps this sort of feature could exist as real time PC
computer software, but I don't know. Real time audio and PC
computer don't seem to be allowed in the same sentence these days, at
least in the Windows world.
73 Bonnie KQ6XA
Graham g0nbd wrote:
The event time is not changed, so its not like a tape speed changer
where the duration is also modified .. amplitude liniartity would be
'nice' but not 100 % important
can it be done ? has it ? music production ?
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