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This section explains the easy way to use noise canceling and
hum canceling; by using the Auto function. For details on
making parameter settings manually, or setting the configu-
ration parameters for the Auto function, refer to Noise Can-
celing (p.22) or Hum Canceling (p.14).
Adjusting the input levels
Use the input level knob to adjust the input level so that the
"OVER" mark of the input level indicator does not light.
Normally, the input level should be adjusted so that the "+6
dB" mark of the input level indicator lights occasionally.
When the input level knob is at the "0" position, the gain will
be unity, and the input and output levels will be identical.
loland
a
NGSE/HUM
BLUMINATO
INPUT LEVEL
* The left and right input levels can be adjusted independently.
Block diagram of the SN-700's internal structure
HUM CANCEL
COMB FILTER
ENVELOPE
DETECTOR
As shown in the diagram, the SN-700 has independent hum
cancel and noise cancel functions for channels A and B. After
the input signal is processed through the hum cancel block,
it is processed through the noise cancel block. Thus if the
input signal includes both hum and noise, you should first
make hum cancel settings to remove the hum, and then make
noise cancel settings to remove the noise.
10
_Easy operation
ENVELOPE DETECTOR
OUTPUT
The SN-700's Auto function detects the frequency and level
of hum and noise, and automatically makes settings for a
variety of parameters. This means that if signals other than
hum and noise are input into the SN-700, the Auto function
will not be able to accurately detect the appropriate fre-
quency or level. When using the Auto function, temporarily
halt the signal so that only the hum and noise is input, or use
the Auto function during a silent portion between songs. This
will ensure accurate detection.
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