Polycom Vortex EF2241 Programming Manual page 103

Filter Type 1-5
Frequency 20 - 20000
Bandwidth 5 - 200
Gain -20 - 20
1 - 1.2 * Gain for shelving filters, 12 or 24 for Linkwitz-Riley
Slope
filters
Enable 0 - 1
The paramters are specified in the order shown and are separated by commas. The wildcard character, *,
may not be used for any of the parameters listed above. If an attempt is made to set one of the parameters
outside the valid range, the command will fail and return an error message of ERROR#002.
Not all of the parameters are valid for each of the filter types. The following table shows which parameters
are used in each of the filter types.
Filter Type
Parametric (1)
Low Shelf (2)
High Shelf (3)
Lowpass (4)
Highpass (5)
Linkwitz-Riley Lowpass (6)
Linkwitz-Riley Highpass (7)
When a parameter is invalid for a given filter type, the parametric EQ commands will still set that parameter,
however its value will not be used for filter computations. This valid/invalid parameter information above is
provided mainly as guidelines for programmers writing control software for the Vortex. If a parameter is not
valid for a specific filter type, then the control for editing that parameter should be disabled or removed
when that filter type is selected.
This command is saved to non-volatile memory only as part of a preset. The state of this command will be
restored after power-up only if a preset is saved and that preset is set to be the power-on preset.
Example
Bandwidth
Yes
No
No
No
No
No
No
Description Status Message
1 = parametric filter
2 = low shelf
3 = high shelf
4 = lowpass
5 = highpass
6 = Linkwitz-Riley lowpass
7 = Linkwitz-Riley highpass
Hz
1/100th octave
dB
dB per octave
0 = filter disabled
1 = filter enabled
Frequency Gain
Yes Yes
Yes Yes
Yes Yes
Yes No
Yes No
Yes No
Yes No
Slope
No
Yes
Yes
No
No
Yes
Yes