Yo,
If you think of the FS as a souped-up ring modulator you might get a
clearer idea. Now, some ring modulators have one signal input and they
use a built-in oscillator to modulate your incoming signal. That's like
the first frequency shifter. Built-in oscillator.
But some ring modulators have two open inputs so you can modulate
anything against anything. The Serge ring modulator has two inputs.
The FRSX is like that two. It drops the internal oscillator and accepts
anything.
Frequency shifting by a sine wave is 'simple' - the output is A + B
(upshift) and A - B (downshift). If your shifting a sine wave by a sine
wave, that's simplest. 100 hz in A and 200 in b gives you 300 upshift
and 100 downshift.
Frequency shift a square wave by a sine wave, things get a little
trickier. All the harmonics get shifted by the same absolute
difference. So the more you shift the more inharmonic the overtones
become. It sounds weird. Also, downshift by enough and you get
'harmonic inversion' - the fundamental is at the high frequency, and the
overtones are fractions (not multiples) of the fundamental.
NOW - shift a square by a square. You get lots of things going on. I'm
not familiar enough with it to go into it, but there must be a lot of
frequencies flying around in there.
I don't know why it would be so much more money - it might have
something to do with level compensation.
Anybody else care to comment?
vtl5c3 wrote:
If you think of the FS as a souped-up ring modulator you might get a
clearer idea. Now, some ring modulators have one signal input and they
use a built-in oscillator to modulate your incoming signal. That's like
the first frequency shifter. Built-in oscillator.
But some ring modulators have two open inputs so you can modulate
anything against anything. The Serge ring modulator has two inputs.
The FRSX is like that two. It drops the internal oscillator and accepts
anything.
Frequency shifting by a sine wave is 'simple' - the output is A + B
(upshift) and A - B (downshift). If your shifting a sine wave by a sine
wave, that's simplest. 100 hz in A and 200 in b gives you 300 upshift
and 100 downshift.
Frequency shift a square wave by a sine wave, things get a little
trickier. All the harmonics get shifted by the same absolute
difference. So the more you shift the more inharmonic the overtones
become. It sounds weird. Also, downshift by enough and you get
'harmonic inversion' - the fundamental is at the high frequency, and the
overtones are fractions (not multiples) of the fundamental.
NOW - shift a square by a square. You get lots of things going on. I'm
not familiar enough with it to go into it, but there must be a lot of
frequencies flying around in there.
I don't know why it would be so much more money - it might have
something to do with level compensation.
Anybody else care to comment?
vtl5c3 wrote:
> Last night I was perusing my Serge catalog and noticed that
> there were two versions of the Frequency Shifter. The second
> version (FRSX) caught my attention.
>
> Here's what it says about the FRSX:
>
> "The basic unit features a built-in oscillator .... Available at a
> higher cost and on special request is a version which accepts
> any external shifting signal. This version may be of interest to
> musicians wanting to shift the sound of one instrument by
> another, say the flute by a tuba....."
>
> Does anyone know how the Carrier input is designed? Is there
> a pitch to voltage converter that is used to convert an audio
> signal to drive the FS? The catalog is a bit vague as to how the
> module works.
>
> Romeo
>
>
>
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