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 ? > > > ------------------------------------ > > Announce your digital presence via our Interactive Sked Page at > http://www.obriensweb.com/sked > > > > Yahoo! Groups Links > > > >
