Chippmann CS-8 COOK, Руководство пользователя, Страница: 15 / 22

CS-8 Series COOK Rev1.3, Feb. 2019
-13-
At the left side (at -100 dbV) one can see the rising the Make-up Gain. It is for
the top graph 50 db (
Cont. 5
at full CW). The point where a graph drops to a
lower slope is called Threshold. In the figure for each curve it will be shifted
from right (high input levels) to left (very low input levels), turning
Cont. 5
from left to right. The softknee character is maintained at any time, but cannot
fully evolve above 0 dbV (input) at low positions of
Cont. 5
. The Ratio values
printed on the front panel are taken at the input level in10 dbV - 0 dbV
and serves the orientation. The scale values
Th/Rt are valid for
Cont. 1
(input)
at full CW, otherwise the whole graphic will be shifted to the right, i.e. the
input level, which drives the compressor is crucial for the result!
The RMS-Converter and Response
The RMS-converter is always computing the root-mean-square of the
incoming audio and is so providing the most important process variable for a
compressor. The
4-position rotary switch 3 (Response) selects an
overshooting response of the RMS-converter, especially at sudden level
ch anges. Th e h eigh t of th e oversh oot increases with h igh er scale values. In
concrete terms the 4 db value of the
Response
scale means a total overshoot
(first peak - first valley) of 4 decibel. This fact is reflected by the corresponding
output signal. Figure 5a, 5b, 5c and 5d shows this behavior for all 4
Response
values.
Every graphic is mapping three quantities. The top graph always shows an
incoming sinus signal of 500 Hz and an amplitude of 2.828 V, which equals a
root-mean-square of 1 Vrms. The signal is sudden starting at T = 0 and the
middle graph shows how the RMS-converter forms within a certain time
(Attack) the root-mean-square. The bottom graph shows the corresponding
output signal, wh ere a h igh compression of about 10 is set. With rising
Response
values the overshoots increases. For a compressor the RMS-
converter controls th e VCA reverse. So, h igh er RMS values (corresponding to
high input levels) leading to a lower VCA gain and vice versa.