Revision F • 3/11
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3-11
3 Control Center Software
audio sample is 1/44,100 of a second or 22.7 mi-
croseconds).
Adjusting the delay time can be done by double-
clicking the Absolute Diversity Delay time (which
then turns blue) and entering a new delay time.
The Diversity Delay Adjustment entry can be used
to add or subtract time to the existing Diversity
delay. In either case, click Apply to change the
delay time. Note that the delay time will then ramp
to the new setting using the Ramp Mode.
To view the delay by Samples, click the Samples
radio button. The same entry methods (double-
clicking the Absolute Diversity Delay entry or en-
tering an adjustment into the Diversity Delay Ad-
justment entry box) as used with Seconds can be
used with Samples.
A rough determination of the HD Radio signal
to analog delay difference can be determined by
simply listening to the two signals in Split Mode.
An audio source with speech, rather than music,
will best facilitate this process. A time difference
of greater than 0.2 seconds is clearly discernible.
If the analog signal arrives before the HD signal,
then more delay is needed and vice-versa.
To more precisely adjust the Diversity Delay,
view the two signals on a dual trace oscilloscope
or use a dedicated HD monitor like the Audemat
Golden Eagle HD.
Ramp Control
The Ramp Control Section simply shows how
much time, in minutes:seconds.hundreds of sec-
onds, that it takes to ramp up from no delay to
the Absolute Diversity Delay set in the Delay Trim
section.
The actual amount of the ramp time is affected
by both the Diversity Delay time itself and by
which Ramp Mode is selected in the
Systems >
Other Controls... setup window. When
Linear
or
S
oft Ramp
is active, the ramp time shown is accu-
rate. When
Smart Ramp
is active the time shown
is the maximum ramp time. The actual ramp time
may be much shorter, especially with spoken word
programming.
Diversity Correction
Checking
External Correction Enable
will al-
low an external “Audio Time Correlation Measure-
ment Device” to post delay correction values, via
Ethernet, to the HDE-200. These correction val-
ues are only utilized when the Diversity Delay is
not being altered (e.g., not being manually adjusted
and not ramping up or down).
The Port used by the particular Time Correla-
tion device is also set in this part of the window
using the Up/Down arrows.
Note that at this time there are no HD receivers
that incorporate this feature, thus it is not nor-
mally enabled.
Saving the Diversity Delay Settings
Once the delay is set (the HD Radio audio and
analog FM audio are in phase with no time differ-
ence), click
Accept to store the Absolute Diversity
Delay Value and other settings in this window to
the nonvolatile memory of the HDE-200 and to
close the window.
The delay value will now be the target during
all subsequent Ramp Up commands. If the delay
was ramped up at the time of an accidental power
outage, the Exporter will automatically ramp back
to that delay target at power restoration.
To discard all changes made to the Absolute
Diversity Delay value, and to the other sections of
this window, click
Cancel to close the window. The
HDE-200 will then ramp to the previous Abso-
lute Diversity Delay value.
3.5.3.2 Enable Blend
The Exporter adds a control signal to the HD
Radio stream that tells an HD Radio receiver what
to do when the HD Radio signal is interrupted or
