pts@watt.acc.Virginia.EDU (Paul T. Shannon) (09/26/89)
We have a psychoacoustic experiment in which we wish to play short segments of recorded speech, at varying pitches. For instance, we record a deep male voice saying a word, and we want to be able to play that word back at a high pitch. The pitch-changing tool in MacRecorder (from Farrallon Computing) is unable to preserve the tempo of the original sound: shifting pitch upwards always shortens the duration of the sound, and increases the tempo. Does anyone know of Mac software that allows us to change pitch *without* changing tempo and duration? - Paul Shannon - pts@virginia.edu
mnkonar@manyjars.SRC.Honeywell.COM (Murat N. Konar) (09/26/89)
In article <963@babbage.acc.virginia.edu> pts@watt.acc.Virginia.EDU (Paul T. Shannon) writes: >We have a psychoacoustic experiment in which we wish to play short segments of >recorded speech, at varying pitches. For instance, we record a deep male voice >saying a word, and we want to be able to play that word back at a high pitch. > >The pitch-changing tool in MacRecorder (from Farrallon Computing) is unable >to preserve the tempo of the original sound: shifting pitch upwards always >shortens the duration of the sound, and increases the tempo. > >Does anyone know of Mac software that allows us to change pitch *without* >changing tempo and duration? Forgive me for suggesting such a goofy solution but if you can't find the software you can do this: Aquire a Yamaha SPX-90 digital effects unit either used or from a music store. There is a setting on this beast which allows you to shift pitch by an amount based on a key pressed from a MIDI keyboard. By sending MIDI information from the Mac to the SPX-90's MIDI in port and audio from the Mac to the SPX-90's audio input, you can transpose the audio pitch without affecting tempo or duration. The downside is the cost of equipment: around $450 or so for a used SPX-90 and around $70-$100 for a MIDI interface. Like I said, it's a pretty goofy solution but it will work and the program to run the experiment can be set up using Hypercard. If you need more detail/ better explanation, send me a note. ____________________________________________________________________ Have a day. :^| Murat N. Konar Honeywell Systems & Research Center, Camden, MN mnkonar@SRC.honeywell.com (internet) {umn-cs,ems,bthpyd}!srcsip!mnkonar(UUCP)