Philips IS 5022 Mark II, Инструкция по эксплуатации

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3
OVERLOAD
CONDITIONS
3.1 Gain
CONTROL
The range of the gain control is
-20
dB to +5 dB and in addition to this a
separate “unity gain” setting is provided. The operator should be aware
that the
very
useful
amplification of +5 dB has certain implications which
are explained below.
3.2
ANALOG
When an analog input signal is
too high, this situation is indicated by the
“OVERLOAD” LED
being lit.
3.3
DIGITAL
When using the digital inputs, due
to
the gain control
extending to
approxi5 dB a situation
may occur
which can be described as
“digital
overload”. The Sound Enhancer
follows
the standard practise
that 0 dB full scale corresponds to the full range of the -60 dB LED up to
and including the 0 dB LED of the display.
For 0 dB
full
scale, clipping
m a y
occur if the gain control is set between
0 dB and +5 dB. This is indicated by the red +1 dB
LED
of the
display
coming on.
On
account
of the characteristics of
the
bass and treble
control,
(refer
to
fig.
6.7)
hard clipping
m a y
occur unless extra attenuation is applied. The
Sound Enhancer is fitted with an automatic anti clipping algorithm that
attenuates
the gain setting to avoid this undesirable situation. The maxi ‑
m u m attenuation of this algorithm is 10
dB.
This
corresponds to the
range of
the bass and treble
control ( + or - 10
steps
of about 1
dB).
This
automatic scaling function is n o t active on the other effects and functions
of the
Sound
Enhancer.
Note: the attenuation does n o t alter the control span of
the
potmeters.
Example: When one increases the bass
and/or
treble and the
GAIN
control is
set
at -10 dB or
higher,
the automatic attenuation
algorithm
is
activated. For every
1 dB
increase
of bass/treble
(ADJUST
+)
there
is a
corresponding
overall attenuation
of 1dB
when the attenuation
algorithm is active.