Specifications

6
Elettromedia
62018 Potenza Picena (MC) Italy
T [phone] - F [phone]
www.elettromedia.it
All specications subject to change without notice_16.D
www.audison.eu
FIR and IIR lters
+10
+5
0
-5
-10
dB
Hz
20 30 50 70 100 200 400 700 1k 2k 3k 5k 7k 10k 20.0k
+10
+5
0
-5
-10
dB
Hz
20 30 50 70 100 200 400 700 1k 2k 3k 5k 7k 10k 20.0k
FIR lters allow for an improved sound quality. Crossovers and equalizers do not cause phase variations on the audio bandwidth,
acting as if they were ideal systems. This processing, with an elevated computation cost, is made possible thanks to the DSP reference
performance.
The IIR lters, deriving from the analog theory, simulate the electric behavior of a traditional crossover, introducing a phase distortion
altering the system frequency response.
Thanks to its outstanding calculation capability, the bit One HD is provided with a FIR type 5 parametric poles input equalizer to flatten
the frequency response for each one of the four input sources, and a FIR type 5 parametric poles main equalizer to shape the system
emission fronts, according to the user listening preferences, fully preserving the original record quality.
When using the crossover FIR lters the phase-shift along the whole audio spectrum can be nullied, with remarkable advantages,
regardless of the parameters selected to lter the audio system.
FIR EQUALIZATION (Finite Impulse Response)CROSSOVER FIR FILTERS
+90
+45
0
-45
-90
dB
Hz
20 30 50 70 100 200 400 700 1k 2k 3k 5k 7k 10k 20.0k
+90
0
-90
-180
-270
-360
deg
Hz
20 30 50 70 100 200 400 700 1k 2k 3k 5k 7k 10k 20.0k
Image 1: electric frequency response simulation (module and phase)
of low-pass Linkwitz-Riley fourth order crossover (24 dB/Oct) summed
with a symmetrical high-pass featuring a 200 Hz cut-off frequency. IIR
lters (in black) and FIR lters (in blue).
Image 2: electric frequency response simulation (module and phase),
of the two poles of the parametric equalizer featuring IIR lters
(in black) and FIR lters (in blue).
FIR
FIR
IIR
IIR
Phase Phase
Magnitude Magnitude