FIR Xover
If selecting FIR in the “Select IIR/FIR” frame, the Xover section is implementing FIR Hp/Lp, and the
interface for the IIR filters setting is the following
Here is possible to select the FIR type, and the all parameters for its configuration.
Particularly,
a. click on the icon to select the Filter
Type
(High Pass, Band Pass, Low Pass or Bypass)
b. insert the Cut-Off
Freq[Hz]
, input the value on the text box and press enter (Frequency from 250Hz
to 20kHz step 1Hz)
c. select the number of the
Num. Taps
of the FIR (from 256 to 512). The FIR latency is dependent
from the number of the taps and, being the FIR running at 48kHz, the latency can be calculated as
follow:
FIR Latency = Ntaps/2 x Ts = Ntaps x Ts/2 = Ntaps x 10.4us
d. select the max attenuation
Att.[dB]
for the out band signal
e. select the
Window Type
of the filter
Once the filter is set, it will be displayed in the window aside the parameters set. In order to make it
active and performing on the Signal path, need to load it within the
LPP260A
clicking on the blinking
icon
which is appearing as soon as a modification ton the currently loaded FIR is done.
