shifters add an exotic dimension to the world of modular synthesis signal
A basic definition of the Frequency Shifter process:
A Frequency Shifter takes the individual frequency components of the input signal and shifts them by the same number of Hertz, producing a subtle or dramatic effect on the tonal character of the sound.
Unlike a Pitch Shifter, The frequency components are translated rather than transposed.
Harmonic relationships are not preserved as harmonic overtones become inharmonic partials.
An example of voice processing with the FS.
Radio discussion of a disease that has put Toronto on the map.The up and down shifted signals are panned left and right in the stereo field.
Kneel Jung.mp3 1094k
Folky turns Alien. Up and downshift panned left and right.
If the output is patched to a mixer and then feedback to the input and mixed with the source signal, barber pole phaser type sounds with apparent 'perpetual rising' effect
Small amounts of shift can be used to produce phasing/chorus effects or alien/chipmunk voices.
Large shifts will impart a metallic or clangorous quality to the signal. Spectral inversion is possible with large negative shifts. The frequency shifting process generates simultaneous up shifted and downshifted versions of the
input signal. Both outputs are available at separate jacks (SUM and DIFF) on the front panel.
Shifting through-zero hertz reverses the function of the outputs making up shift become downshift and vice-versa.
With both outputs panned left and right unusual stereo image effects are also possible.
The Modcan Frequency Shifter 39B features:
Low-distortion wide-range through -zero quadrature oscillator design capable of very stable large or small shifts.
Companding is provided
on both outputs for low-noise operation with minimal carrier feed through.
This is a high performance alternative to the squelch approach found in vintage units.
Carefully-selected components and trimming are used to maximize opposite-sideband rejection.
Extra Large (1-3/4") graduated shift knob for precision control.
The input signal level is adjusted using the panel control attenuator.
Feed Back Loop IN and OUT
Feed back loop for insertion of external modules
for processing the feed back signal.
An exellent example is the Super Delay 30B
With no plugs inserted the feedback path is normalled and the panel feedback amount control sets the depth. Swirling barber pole phaser type effects are possible in this mode.
When in EXPO mode the 1V/Octave can be used to
track a keyboard. Interesting results can be had by tuning and tracking an un pitched sound source like pink noise.
Tuned noise.mp3 547k
Pink noise 'tuned' by the FS
Control Voltage input with panel attenuator
for CV modulation of the shift amount.
Select between Exponential or Linear response.
This is a global function that affects the response of
the main shift knob control and the cv inputs.
Sum and Difference Outputs:
Outputs for up and down shifted signal
+/- 5kHz knob shift range (greater with CV)
Output impedance: 1k ohms
1 Volt per Octave (Expo mode)
1 V per 1kHz (Linear Mode)
Frequency Shifter electronic
design by Michael Irwin