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Frequentierespons minimale fase filter Frequentierespons steile filter
-80
-60
-40
-20
0
20
-200
-180
-160
-140
-120
-100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
frequentie/FS (inkomende sample-rate)
Magnitude (dB)
Het minimale fase filter is ook een zeer goed aangeschreven audiofilter, dat wordt
gekenmerkt door een nog lagere golving in de passband en de stopband. Anders
dan bij het lineaire fase filter is de groepsvertraging niet constant, zodat er wat tijd-
coherentie verloren gaat; de faseverschuiving is echter laag en het grote voordeel
van dit filter is dat de impulsrespons geen pre-ringing vertoont.
0
0 20 40 60 80 100 120 140 160 180
Impulsrespons minimale fase
Tijd (voorbeelden)
Amplitude
-80
-60
-40
-20
0
20
-200
-180
-160
-140
-120
-100
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Lineaire fase filter
Steil filter
frequentie/FS (inkomende sample-rate)
Magnitude (dB)
Ons steile filter is een lineaire fase filter dat is geoptimaliseerd voor demping van
‘close-in aliasingin de stopband. Hier hebben we een klein beetje demping
ingeleverd bij de allerhoogste fequentierespons (voor 44.1kHz gesampeld materiaal
zou dit -2dB bij 20kHz bedragen) en laten we iets meer pre- en post-ringing toe,
maar daar staat een zeer sterke demping net buiten de passband tegenover. Het
steile filter kan aliasing tot ongeveer 80 dB dempen bij 22kHz.
Alle filters vertonen dezelfde ultieme roll-off van ongeveer 140dB.
In de volgende tabel ziet u een voorbeeld van de demping van de stopband door het
filter bij 44.1kHz materiaal:
Lineaire fase Minimale fase Steil
Roll-off bij 20kHz -0,1 dB -0,1 dB -2 dB
Roll-off bij 22kHz -10 dB -10 dB -82 dB
Ultieme roll-off 140 dB 140 dB 140 dB
We adviseren u te experimenteren met de filters, om erachter te komen welk geluid
voor u het beste klinkt en het beste bij uw apparatuur/programma’s past.
0
0 20 40 60 80 100 120 140 160 180
Tijd (voorbeelden)
Amplitude
Impulsrespons steile filter
Filters (vervolg)
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