Frequency Shifters

[jh.]

> >From a technical point of view, I understand what these do, but what is
> their musical context? Is it just for strange modification? They do seem
to
> destroy the harmonic structure of the sound very well.

On my new CD (shameless self advertisment here) I have two types
of FS use:
One track is completely played thru the FS, with harmonic structure
altered, but there are still recognizable melodies - sort of Vangelis'
Beaubourg-like.
On another track I've used the FS to transpose spoken words up
(with the the harmonic structure altered), and then used a reduced
playback rate (Line-6, DL4), i.e. Pitch shift, with to get the fundamental
back down to it's normal range, but the harmonics still mixed up.

> In both cases, the problem seems to be non-linearity in the multipliers
> causing second and third harmonic distortion, which appears as side band
> bleed thru and isn't nulled by simple phase cancellation

I used 1496 multipliers, and I had to reject one because of bleedthru;
it would simply not be trimmable to zero. Used a different 1496 and
it was fine. No measurments or dB figures - just fine "by ear".

JH.

>