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Group 3. This group shows Audio related levels
Group 4. This group shows reception quality related levels
Ultrasonic Noise
bargraph (lower is better). To give an indication about the
Ultrasonic Noise
the amplitude of the high frequency content of the
MPX signal
is measured. This
is measured in the bandwidth of approximately 80 kHz up to 150 kHz.
Stereo Blend
bargraph (higher is better). In stereo signals, the difference (L-
R) component of the
MPX signal
is more susceptible to disturbances than the sum (L+R) signal.
Therefore, the separation of the left and right audio channels can be reduced in order to reduce
the audibility of the disturbance. This reduction of channel separation is called “stereo blending”.
The level of stereo blending is depends on the following input signals:
Signal Level
,
Multipath
,
Ultrasonic Noise
and
Pilot
tone deviation.
Содержание DB4004
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