9
Spectralizer
F
REQUENCY
sets the starting frequency of the highpass filter.
Above this frequency second and third harmonics are being
generated. The highpass filter can be varied between 1 kHz
and 7 kHz in steps of 500 Hz.
M
IX
controls the mix level between the processed and the
unprocessed signal. The control range is 0 % to 100 %. The M
IX
encoder is equipped with an „alpha-dial“ logic. Turning the
encoder rapidly causes the values to jump in steps of 10,
whereas turning the encoder slowly causes the values to
proceed in single increment steps.
Example:
All controls are set to the starting position:
I
NPUT
G
AIN
0; F
REQUENCY
1k; D
ENSITY
0; 2
ND
H
ARMONIC
0%;
3
RD
H
ARMONIC
0%; M
IX
0%.
Turn the M
IX
to 50%. You will hear an increase in high
frequencies above 1 kHz due to the starting position of the
F
REQUENCY
control. Until now you have not yet added any
harmonics. The increase in high frequencies is a boost of all
frequencies above 1 kHz. You can change the starting frequency
by turning the F
REQUENCY
encoder clockwise to higher frequen-
cies. For some applications this may already do the job.
To add harmonics set 2
ND
H
ARMONIC
to 50% and 3
RD
H
ARMONIC
to 30%. If the audible effect is very subtle increase
the D
ENSITY
setting to 1 or 2 (details see D
ENSITY
, 7).
The 2
ND
H
ARMONIC
encoder controls the intensity of the
added second harmonics which are being generated above the
adjusted highpass frequency (see F
REQUENCY
, 3).
The second harmonics are even harmonics which bring a soft
and silky top-end to the sound. In comparison to odd harmo-
nics, even harmonics do not contain as much brightness and
they also do sound softer.
Control Elements
Mix
4
2nd Harmonic
5
Frequency
3
Diagram 2:
2
ND
H
ARMONIC
The illustration shows the
FFT spectrums of the even
harmonics for a measuring
signal of 3 kHz.
