BSS Audio FPC900r, Руководство пользователя

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VARICURVE
5 2
TM
S Y S T E M
The Contour box allows the user to select a response curve that
describes the desired frequency response for the room being equalised.
Generally the user will stick to curve R1 which is FLAT or possibly
curve R2 which has 3dB/octave roll offs at top and bottom. The
possibility also exists to use other stored equaliser curves. It might be
that the requirement is for a sound that always has 6dB of boost at
10kHz. If so, use the standard filter controls to create the curve and
store it in one of the device program memories or overwrite one of the
remote Room curves (R1 to R12 -
Refer to Section 6.0 ‘STORE’ ). The
stored curve can now be selected in the Contour item to be the target
response for the next AUTOEQ calculation. The chosen response
curve is always displayed on the screen whilst in the AUTOEQ menu.
One further possibility is to use the RTA measured at one venue to be
the target equalisation at another.
!
Measure the RTA at the first venue and use the ROOMCV facility in
the RTA menu to turn the RTA graph into an EQ curve.
(Refer to Section 12.0 ‘Room Curve and Add Curve’).
"
Store the resultant curve into one of the remote Room curve
memories e.g. R7. (Give it a name so it doesn’t get overwritten.)
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At the second venue set up the RTA to measure the room response
and perform an AUTOEQ using the response curve stored in R7 as
the target response. The second venue will be equalised to give a
room response similar to the first venue.
13.3 Target Room
Curves
Target Room Curves
AUTO EQ - How it works.
After inverting the combined RTA response and adding to it the
target curve, a sophisticated algorithm analyses the resultant curve
and calculates the filter parameters required to match the resultant
curve. If the curve shape is too complex for the number of filters
available, it is simplified by smoothing. To prevent filters being
wasted by trying to compensate for impossible deficiencies of the
system or environment at the extremes of the frequency response,
AUTO EQ will not analyse nor allocate filters to frequencies
beyond the end points where the target curve falls more than a
few dB below the 0dB centre line.
AUTO EQ on a stereo device will produce the same curve on
both channels whereas only one channel of a dual device will be
affected.