DOEPFER A-126 Manual de usuario

doepfer 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

A-126 VC Frequency Shifter System A - 100 doepfer

2. VCFS - Overview Controls:

1Level : gain control for the signal connected

to input !

2Overload : LED overload warning light for the

input signal

3Shift : control for manual frequency-shifting

4CV : attenuator for the frequency-shifting

control voltage at input §

5Mix : control to balance the relative

amounts of Up and Down frequency-

shifted signals at output $

In / Outputs:

!Audio In : audio input (line level)

"Audio Out : audio output (the original signal

amplified but not frequency-shifted)

§CV : control voltage input for pitch-shifting

$Mix Output : mix output for Up and Down signals

%Down Output : output for just the downward-shifted

audio signal (Down)

&Up Output : output for just the upward-shifted

audio signal (Up)

A-126

VCFS

Audio Out

Shift

Mix

Level

Audio In











➀

➂

➃

➄



VC Frequency Shifter

010

Down

Output

Mix

Output

Overload

➁

doepfer System A - 100 VC Frequency Shifter A-126

3. Basic principles

Frequency shifting can slide an audio signal upwards

("UP Shift") or downwards ("DOWN Shift").

This is not the same as transposition (in which all of

the components of an audio signal are raised or lowe-

red by an equal interval).

With frequency shifting, all the component harmo-

nics of a sound are shifted not by an equal musical

interval, but by the same frequency.

As a rule, the resulting output signal is very likely to

be dissonant, because the overtone frequencies are

altered not by a proportional amount, but by exactly

the same number of Hz. Think of a sawtooth with a

500 Hz fundamental, a first harmonic at 1 kHz, second

at 1.5 kHz, and so on. If the signal is shifted upwards

by 100 Hz the new fundamental will be 600 Hz, and

the overtones 1.1 kHz, 1.6 kHz, etc.. These overtones

are no longer perfect harmonics of the fundamental.

As with ring modulation, very complex, spectrally rich

sounds often result.

4. Controls

1 Level

Control 1is used to set the amount of amplification

of the input signal at socket !.

2 Overload

LED 2lights up when the input signal overloads.

3 Shift

The amount of frequency shifting is set manuallywith

this control in a range from c. 50 Hz to 4 kHz.

4 CV

In addition to the manual control, the amount of fre-

quency shifting can also be altered by a control voltage

patched into input §; the level of voltage control can

be set with attenuator 4.

A-126 VC Frequency Shifter System A - 100 doepfer

5 Mix

Use control 5to set the relative amounts of upward-

and 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:

Mix = 0 : just the downward-shifted signal is heard

Mix = 10 : just the upward-shifted signal is heard

5. In / Outputs

! Audio In

Socket !is the frequency shifter’s audio input. Use it

to patch in the audio signal you want frequency-

shifted.

" Audio Out

Output "relays the original signal, amplified.

§ CV 1

Patch a control voltage for modulating the amount

of frequency-shift into socket §. The level of voltage

control is set with attenuator 4.

As a rule, a slowly-changing voltage (e.g. LFO, ADSR,

Random, etc.) or the CV output from a MIDI-CV-

Interface (e.g. A-190, A-191) is used for this.

$ Mix Output

Depending on the position of control 5, output $

contains a mix of the downward and upward

frequency-shifted signals.

% Down Output

Output %contains just the downward frequency-

shifted signal.

& Up Output

Output &contains just the upward frequency-

shifted signal.

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’.

A kind of vibrato effect can be produced by modula-

ting the frequency-shift with a slow sine-wave from an

LFO (frequency about 5 - 7 Hz).

More drastic effects can be produced by replacing the

sine wave with a sawtooth (frequency about 1 - 2 Hz)

to produce a repeated rising modulation.

With the patch in fig. 1 you can ‘roughen up’ audio

signals (e.g. voices) by modulating the frequency-shift

with colored noise, and sending the original and the

frequency-shifted signals to a mixer, to control the

amount of ‘harshness’ or ‘edge’.

With the patch in fig. 2, you can create a new type of

percussive stereo effect, using the square wave from

an LFO (frequency c. 5 - 6 Hz) to modulate the

frequency-shift and continuously alter the side-bands.

The Up and Down outputs are sent to left and right

stereo channels respectively.

fig. 1: "roughening up” an audio signal

fig. 2: percussive stereo effect

VCFS

A-118

Audio-

Signal

CV In

A-138

Colored

VCFS

VCA

Down

VCA

LFO

Audio-

Signal

CV In

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.

Particularly if the LFO frequency is harmonically rela-

ted to the fundamental of the audio signal, this can be

a very pleasing effect.

One popular effect in the past was to frequency-shift

an octave band of sound, produced by band-pass

filtering the output from a noise module (see fig. 3).

fig. 3: frequency-shifting an octave band

Interesting and unusual percussion sounds can be

produced with the patch in fig. 4.

In this patch, a percussive sound (e.g. kick drum,

snare) is fed into the frequency shifter. Using the shift

control, you can then alter the apparent size of the

instrument.

By deriving a trigger or gate signal from the drum, and

controlling the frequency shifting with a short enve-

lope, some effective and exciting percussion sounds

emerge.

fig. 4: using the A-126 for new percussion sounds

VCF

LFO

CV In

VCFSA-118

VCFS

Drum-

Signal

A-119 ADSR

Gate

Out

Audio

doepfer System A - 100 VC Frequency Shifter A-126

Very interesting sound textures can result from a

combination of frequency shifting and frequency

modulation (see. fig. 5).

Just combining the two VCOs with frequency-shifting

and FM can produce a wide range of massive sounds,

and adding dynamic control of the frequency-shifting

by using an ADSR can make them even more inter-

esting. A whole new category of sounds is waiting to

be explored.

fig. 5: combining frequency-shifting and FM

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 ex-

panded still further.

fig. 6: mixing the Up, Down and original signals to

produce your chosen blend of sound

VCA

VCO 1

ADSR

VCFS

Gate

VCO 2

A-126

Audio Out

Down

A-138 b

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.

P • Draw in patchleads with colored

pens.

• Draw or write control settings in the

little white circles.

A-126

VCFS

Audio Out

Shift

Mix

Level

Audio In

VC Frequency Shifter

010

Down

Output

Mix

Output

Overload

A-126

VCFS

Audio Out

Shift

Mix

Level

Audio In

VC Frequency Shifter

010

Down

Output

Mix

Output

Overload

A-126

VCFS

Audio Out

Shift

Mix

Level

Audio In

VC Frequency Shifter

010

Down

Output

Mix

Output

Overload

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