Frequency Generator - d&b audiotechnik D40 Reference Manual

d&b D40 Reference manual 1.5 en

7.10 Frequency generator

Selecting «Frequency generator» opens the corresponding
subscreen.
Each amplifier channel is equipped with an independent signal
generator offering sine wave or pink noise signals.
The generator provides pure-spectral sine wave signals with high
frequency accuracy and free of harmonics.
The generator can be used to check the connected loudspeakers
or to identify room resonances, for example.
The generator is inserted in the signal path after the input section
and before the actual signal processing. The test tone will sum up
with any input signal present.
Note: As a precautionary measure, the frequency generator is
always set to «Off» after power cycling the device.
Off
The frequency generator is switched off
(Bypass).
Sine/ To turn the frequency generator on, select
Pink noise either «Sine» or «Pink noise», depending on
the desired signal.
Frequency The frequency is adjustable from 10 Hz to
20 kHz.
On the top right of the «Frequency» input field,
the increment is displayed as an octave value.
When you tap the field for the first time, the
frequency increment is set to 1/6 octave.
When you tap the field again, you can toggle
between 1/6 and 1/96 octave increments.
Þ To confirm the set frequency, press the
encoder.
Level The level in dBu is adjustable from –57.5 dBu
to +6 dBu in 0.5 dBu steps.
Þ To confirm the set level, press the encoder.
The level value corresponds to the level at the
controller signal input. The actual output
voltage depends on the channel input gain,
the frequency dependent gain of the selected
loudspeaker setup and the EQ settings, if
applicable.
Þ To confirm the set frequency, press the encoder.
On the Home screen, the On/Off status of the generator is
indicated by the entry «FG» on the Channel view button of the
corresponding channel strip, as shown in the graphic opposite.
Channel setup
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