DOEPFER A-126 Manual - Página 3

Procurar online ou descarregar pdf Manual para Equipamento de gravação DOEPFER A-126. DOEPFER A-126 8 páginas. Vc frequency shifter

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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.

System A - 100

4. Controls

1 Level

Control 1 is used to set the amount of amplification

of the input signal at socket !.

2 Overload

LED 2 lights 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.

VC Frequency Shifter

A-126