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System A - 100

VC Frequency Shifter

A-126

1. Introduction

Module A-126 (VCFS) is a voltage-controlled fre-

quency shifter.

The amount of frequency shift can be varied from

about 50 Hz up to 4 kHz, either manually, or by voltage

control (via an attenuator).

The amount of input signal gain can be controlled

with the

Level

knob.

The

upward- (Up)

and

downward- (Down)

shifted

signals are available at separate outputs, and also at

the Mix output, where a mix of the two frequency-

shifted signals is available, with the balance controlled

by a Mix knob.

The Audio Out socket provides an amplified but not

frequency-shifted version of the original input signal.

A-126

VC Frequ. Shifter

Level

Mix

Down

Over-

load

Shift

Mix

Audio

Out

Summary of content (8 pages)

PAGE 1
System A - 100 doepfer VC Frequency Shifter A-126 1. Introduction Module A-126 (VCFS) is a voltage-controlled frequency shifter. A-126 VC Frequ. Shifter Audio In Audio Out CV Level Overload Shift CV The amount of frequency shift can be varied from about 50 Hz up to 4 kHz, either manually, or by voltage control (via an attenuator). The amount of input signal gain can be controlled with the Level knob.
PAGE 2
A-126 VC Frequency Shifter System A - 100 Controls: 2.
PAGE 3
doepfer System A - 100 VC Frequency Shifter A-126 3. Basic principles 4. Controls Frequency shifting can slide an audio signal upwards ("UP Shift") or downwards ("DOWN Shift"). 1 Level This is not the same as transposition (in which all of the components of an audio signal are raised or lowered by an equal interval). With frequency shifting, all the component harmonics of a sound are shifted not by an equal musical interval, but by the same frequency.
PAGE 4
A-126 VC Frequency Shifter System A - 100 doepfer 5 Mix § CV 1 Use control 5 to set the relative amounts of upwardand downward- shifted signals present at the mix output $. If the knob is turned fully clockwise or anti-clockwise, only one of the signals is audible: Patch a control voltage for modulating the amount of frequency-shift into socket §. The level of voltage control is set with attenuator 4.
PAGE 5
doepfer System A - 100 VC Frequency Shifter A-126 6. User examples A typical use for a frequency shifter is to transform the human voice - for instance, in a simple example, to produce ‘robot voices’. AudioSignal VCFS CV In A kind of vibrato effect can be produced by modulating the frequency-shift with a slow sine-wave from an LFO (frequency about 5 - 7 Hz).
PAGE 6
A-126 VC Frequency Shifter System A - 100 doepfer If you increase the LFO frequency into the audio range (above about 20 Hz), other effects are produced. Interesting and unusual percussion sounds can be produced with the patch in fig. 4. Particularly if the LFO frequency is harmonically related to the fundamental of the audio signal, this can be a very pleasing effect. In this patch, a percussive sound (e.g. kick drum, snare) is fed into the frequency shifter.
PAGE 7
System A - 100 doepfer Very interesting sound textures can result from a combination of frequency shifting and frequency modulation (see. fig. 5). By using a mixer module A-138b, and altering the relative levels of the Up, Down and original signals, the tonal possibilities of the frequency shifter can be expanded still further.
PAGE 8
A-126 VC Frequency Shifter System A - 100 doepfer 7. Patch-Sheet The following diagrams of the module can help you recall your own Patches. They’re designed so that a complete 19” rack of modules will fit onto an A4 sheet of paper. Photocopy this page, and cut out the pictures of this and your other modules. You can then stick them onto another piece of paper, and create a diagram of your own system. Make multiple copies of your composite diagram, and use them for remembering good patches and set-ups.