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VP-8IP / Sep 2013
V P - 8
i P
P R O C E S S M O D E S
Hard
– the
Hard
style has an infinite ratio with no increase in peak
levels above threshold. This clipper adds brightness and density to
the program.
Firm
– The
Firm
style has a transfer function that allows progressively
higher ratios over a 0.5dB transition region. Its operation is somewhat
softer sounding than the Hard setting, but is a bit less forgiving in drive
level and can therefore sound grainy on certain program material.
Round
– The
Round
style has a transfer function that allows pro-
gressively higher ratios over a 1.10dB transition region. This style
contributes roundness to the audio without sounding harsh but can be
the most difficult mode to tune for its sweet spot. However, it can be
quite powerful for certain formats when tuned correctly.
In both
Firm
and
Round
modes the ear is the best guide for finding the best settings.
Diversity Delay
The
VP‑8
iP
contains an internal digital delay to compensate
for the corresponding delay in the analog side of the HD Radio co-
dec. The delay section is capable of providing up to ten seconds of
compensating delay in steps of 100 microseconds.
The Coarse
delay is set first to align the analog and HD signals as
closely as possible, and then the Fine delay control is used to trim the
delay to precisely compensate for that in the HD channel. Generally
it is a good idea to set the
Fine
delay to midrange before adjusting
Coarse
delay so
that the
Fine
delay can then be adjusted in small increments up and down until perfect
synchronization with the HD signal is achieved. Resolution of the Coarse delay is
50 milliseconds.
The Fine
control covers a range of 50 milliseconds in 0.1 millisecond
(100 microsecond) steps.
Manually Entering Delay Value
When the Fine control does not set the increment exactly to the value desired,
double clicking on the delay value text box will open it for manual entry of a delay
time. Note that the text box expects the manual input to be in milliseconds. Therefore, a
required diversity delay setting of 8.3488 seconds would simply be entered as “8348.8.”
You may also hold down the
Shift
key on your keyboard while adjusting a delay
slider to affect faster adjustment rates, or hold down the
Ctrl
key to achieve finer
control.
When the Delay controls are both set to their minimum settings,
OFF
appears in
the delay window to signal that there is no delay at all in the circuit.
FM
