Båndpasfilter
Båndbredde målt ved halv-effekt punkter (forstærkning -3 dB, √2/2, eller omkring 0,707 relativ til spids/top) på et diagram som viser signalstyrke overføringsfunktion som funktion af frekvensen for et båndpasfilter.
Et medium-komplekst eksempel af et båndpasfilter. Det skal bemærkes, at signalgenerator (indgangs-) og udgangs-impedans har stor betydning for overføringsfunktionen og derfor også burde være tegnet med.
Båndpasfilter-symbol.
Et båndpasfilter er et filter, der bruges til at dæmpe uønskede frekvensintervaller, og lade et ønsket frekvensinterval passere. Det er mest brugt i radiosendere og radiomodtagere.
Se også
 | Spire |
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Medier brugt på denne side
Bandpass Filter.svg
A schematic diagram of an example of a band-pass filter, in T-section Cauer topology. This filter is made up of capacitors with capacitance C and inductors of inductance L.
A schematic diagram of an example of a band-pass filter, in T-section Cauer topology. This filter is made up of capacitors with capacitance C and inductors of inductance L.
Band-pass filter symbol.svg
Forfatter/Opretter: Cabfdb, Licens: CC BY-SA 3.0
Electronic symbol of a band-pass filter
Forfatter/Opretter: Cabfdb, Licens: CC BY-SA 3.0
Electronic symbol of a band-pass filter
Crystal128-tv.svg
Forfatter/Opretter: Everaldo Coelho (YellowIcon);, Licens: LGPL
Et ikon fra Crystal-temaet
Forfatter/Opretter: Everaldo Coelho (YellowIcon);, Licens: LGPL
Et ikon fra Crystal-temaet
Bandwidth 2.svg
A diagram showing the definition of bandwidth (B) for a bandpass filter. f0 is the centre frequency, fH is the higher cut-off frequency, and fL is the lower cut-off frequency. The 0 dB level is the level of the peak of the bandpass response, which is not necessarily located at the centre frequency. Also the centre frequency is located at either the arithmetic or geometric mean of the upper and lower cut-offs depending on context and conventions.
A diagram showing the definition of bandwidth (B) for a bandpass filter. f0 is the centre frequency, fH is the higher cut-off frequency, and fL is the lower cut-off frequency. The 0 dB level is the level of the peak of the bandpass response, which is not necessarily located at the centre frequency. Also the centre frequency is located at either the arithmetic or geometric mean of the upper and lower cut-offs depending on context and conventions.