Sound Performance Lab 9631 - Manual (Page 9)

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.