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English 7
The acoustic properties of vehicle compartment tend to cause oscillation due to
resonance or unclearness of sound due to standing waves at certain frequencies.
The band reject filter can solve the problems of resonance or unclear sound
with minimum influence on the sound quality because it eliminates only the
frequencies causing resonance or standing waves.
■ Adjustment method:
The band reject filter cuts only the limited frequencies to minimize influence
on the sound quality. Therefore, its effect cannot be obtained unless the
cutoff frequencies are set accurately to the frequencies causing resonance
and standing waves. The band reject filter can be adjusted according to what
you feel through your ears, but we recommend the use of a signal generator
or a spectrum analyzer with a fine frequency measurement capability for the
adjustment.
• Adjustment using a signal generator:
Output a sine wave, vary its frequency to find the frequencies at which
the vehicle compartment resonates or volume increases (standing waves
occur), and set the B.R.F. FREQUENCY control to the position with which the
resonance and standing waves disappear.
• Adjustment using a spectrum analyzer:
Output white noise (sound in which all frequencies are at a certain level),
find the peak frequency observed on the spectrum analyzer, and set the
B.R.F. FREQUENCY control to the position with which the peak observed on
the spectrum analyzer disappears.
Band Reject Filter
Frequency
0 dB
Menu System
Display mode
You can set up the display items as follows:
1 Select a display item
Turn the Control knob.
The display items are switched in the following sequence.
Display Information
"VOLT" Indicates the source voltage (V).
"CURRT" Indicates the current consumption (A).
"TEMP" Indicates the internal temperature (°F/°C).
"DEMO" Allows you to set up the display demonstration.
NOTE
When the internal temperature is -22°F/-30°C or less, "-22F"/"-30C" is
displayed.
Display Item Adjustment
You can adjust the display items as follows.
1 Select a display item
Turn the Control knob.
2 Adjust the display item
Press the Control knob.
The setup items and set values are switched as follows.
Display Range Adjustment Item
"TEMP"
---F (Fahrenheit) /
---C (Centigrade)
The Fahrenheit or Centigrade temperature unit can be selected
for the Display mode.
"DEMO"
OFF/
ON
When set to ON, the "VOLT", "CURRT", and "TEMP" items are
displayed repeatedly.
NOTE
Normally the setting listed at the top of the chart is the original setting.