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66
Distortion curves are shown in Fig. 6.1 and Fig. 6.2 to help the user optimize the choice
of compressor speed for the particular application. For low to medium a-values, a
"Rate" of "1 dBs-
1
/Hz and a "Max. Speed" of "1 000 dB/s" should result in a suitable
compressor speed.
0
dB
I
I
I
I
I
1.
0 dB
=
1 V RMS (20 dB Compression)
10
20 10%
30
1000 dB/sec
c:
0
40
:;::
0
iii
c
50
0
·c:
0
E
60
«;
J:
"C
70
c:
0
0
Q)
en
80
90
"-1%
"
~
'
100 dB/sec
300 dB/sec
~
1-0,1%
to-....
............
'
'"
"-..
~"
............
~
30 dB/sec
...........
"
"'
~~
-0,01%
..............
...__
"'
-
.............. ..............
............
..............
~ ~
----
-
~
10, 3 and 1 dB/sec
""' - -....
----
..............
;:::
~
----
100 -0,001%
110
I
0,1 Hz 0,2
0,5
2
5
10
20
50
100
200
500 1 kHz
2
5
10
Frequency
860944
Fig. 6. 1. Typical second harmonic distortion curves
0
I
I
I
I
I
I
dB
0 dB
=
1
V RMS (20 dB Compression)
10
20
30
c:
0
40
:;::
0
iii
c
50
0
·c:
0
60
E
«;
J:
"E
70
:c:
I-
80
90
100
I
I
1000 dB/sec
"'
Comp. Rate
I
300
dB/sec~
1
:
3 dB/sec per Hz
10%
100 dB/sec"'
.........
~
II:
1 dB/sec per Hz -
30 dB/sec " ' -
"'
Ill
:
0,3 dB/sec per Hz
10 dB/sec
i' - .....
"-..
IV:
0,1 dB/sec per Hz
3
d~/sec
..........
I
~
~
~
~~
~-
"
~
~
""
1-1%
1
.......
~-
~
""-~
........
~
""
1 dB/sec
,-
K.
'
~
"'
~
........
~
~
~
~
0
~
"
- -
--
~
-
\
"-0,1%
lo....
IV'
~
~
-~
~
'"'
""
~
- - - -
.............
i'o....
!'....
~
........
~
~
..........
~~
0,01%
'-
!'....
~'-....
...........
~
~
""
'\
~
"
............
r':: ~ ~
0,00,1%
...
~
110
0,1 Hz 0,2
0,5
2
5
10
20
50
100
200
500 1 kHz
2
5
10
Frequency
860945
Fig. 6.2. Typical third harmonic distortion curves
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