Conference napalm::commusic_v1

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    John Sauter

I assume what they do is loop the sample.  There's an obvious problem with this
if the loop point introduces a transient.  If the harmonizer transposes by
2 octaves, you've got to loop 4 times.  It's not quite this simple, of course,
as the incoming signal's still got to be captured and buffered while the
earlier versions of it are still being scanned.  I'm just winging it, I've
never used one of these (well, a digital delay is capable of this sort of thing
but I only use mine to generate echo and chorus-like effects - which does
involve some modest pitch modification).  Obviously, transposing down is easy -
you just skip samples.

len.

      When a harmonizer is creating a higher interval, the unit splices
and re-splices the sample to create the illusion of hearing the full
note.  On the less expensive models such as the Ibanez HD-1500 (I have one)
you can actually hear the splicing taking place.  It gives the effect of
having a digital delay on the upper harmonic.  The better units such as
Evantide supposedly mask the splicing somehow so it is not as noticable.
But for $1000 more, I think I can live with sound of the Ibanez.  I've
actually found the sound of the spliced sample very usfull.

 PIPA::JANZEN               * Integrated Circuits *           27-SEP-1985 09:04 
 Note 47.7                      -< SAD1024 ? >-                          7 of 7 

The Reticon Analog Signal Processing Integrated Circuits data and
applications book (Spring 85) which just arrived from East REgional Office
35 Congress St., Salem, MA, 01970, (617)7457400, does not have this part,
but does have more up-to-date versions of the same function.
The application notes are about pitch transposers and reverbs and signal
processing filters.
The pitch transposer articles are in reference to tape recorders that can
play at different speeds without changing the pitch of the speaker on the
tape..
Tom

If an analogue delay line uses to BBD's in parallel to produce pitch shift.
Do digital delay/harmonizers/pitchshifters use parallel memory locations ?

I'm biulding a digital delay unit to my own design and would like to make
it do pitch shifting if I knew enough about it .So far I've got four
parallel twelve bit a/d converters working in unison into a sixteen bit d/a.
Sampling at 92khz .I intend adding 256k dram .

Steve..

I have been thinking about this for my version of this project.
The simple approach for a processorless design for harmonizer mode is:
Have the input write to only about 30 milliseconds of RAM, and have the
output read from the same bit of RAM, and different speeds or with a
skipping-locations technique for making a higher pitch and  a
doubling-locations tchnique for making a lower pitch.  Skipping locations
threatens aliasing.
Tom

Can anyone help me with the following questions,

1 Are harmonizers that are built into echo units suitable for the pitch
  transposition of continuous voice signals , or just musical notes ?

2 I have heard the effect of pitch shifting a voice , on several records.
  Is this generally done using a harmonizer or a vocoder?

3 How much pitch change is needed to produce the sound on these recordings ?
  (doubling,trebling in pitch ?)

Thanks

Steve Collins...

re .7, q2 - I'm no expert, but the pitch shifting I've heard (like
on the new Godley and Creme thing) sounds like it was done with a
sampler or (almost the same) a digital delay.  I.e., massive munchkinization.

len.