Front Panel Description - Phonic PCL 3200 User Manual

FRONT-PANEL DESCRIPTION-
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COMPRESSOR/LIMITER AREA
Compressors and limiters are signal proces-
sors that reduce the dynamic range of the
signal. It prevents signals from exceeding a
given threshold level.
(1) THRESBOLD (-40 dB to +20 dB)
This control sets the level of compression to
input signal and thus prevents distortion and
gives good protection to your amplifier and
speakers. Rotating clockwise raises the
threshold, thus squeezing signals at a higher
level and reducing the amount of compression
or limiting; and vice versa.
(2) RATIO (1:1 to infinity:1)
The ratio of the change in output level (in dB)
to the change in input level is known as the
compression ratio.
When this rotary VR is set at 1:1, there is no
signal compression. When it is set at 2:1, any
input signal over the threshold setting is com-
pressed to half. When it is set at
signal over the threshold setting will be com-
pressed completely. FIGURE A explains the
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12
10
( 5 dB Compression )
8
OUTPUT Threshold
6
4
2
0
0 2 4
FIGURE A.
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(CHANNEL A and CHANNEL B are identical.)
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5 6 7 8 9 10 11
:1, any
1:1
(Ratio)
2:1
6:1
6 8 10 12 14
INPUT
comparison of compressed signals respond-
ing to various VR settings.
(3) ATTACK (0.1ms to 200ms)
This control works only when PEAK/RMS( #9)
is set at PEAK mode. It sets the compression
attack time interval between input peak signal
and threshold setting.
(4) RELEASE (0.05sec to 3sec)
Contrary to the ATTACK control, this control
decides the de-compress interval for a com-
pressed signal to return to its original value.
The PEAK RMS control (#9) must be in PEAK
mode. This is helpful to compensate for poor
mic or vocal technique.
FIGURE B explans how the ATTACK/RE-
LEASE works.
Different time settings will create different
effects.
v
OUTPUT
Attack
10 dB
6 dB
2 dB
FIGURE B.
(5) OUTPUT (-20 to +20 dB)
This control adjusts the output level. For
example, if you try to make a CD duplication
from a cassette, it is necessary for you to ac-
commodate the cassette's limited dynamic
range.
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Release
(Threshold)
Compression
t
PCL 3200