# What is Band pass filter: Definition and 16 Discussions

A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.

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1. ### I How does a band pass filter increase the time of arrival of photons?

Here is my thought experiment: Let's say I attenuate a very short laser pulse to single photon intensity. Due to the uncertainty principle, I know the time of arrival of the photons, but not their energy. So let's reverse that by splitting the pulse in its spectral components with a diffraction...
2. ### I Understanding RC Band Pass Filter Graphs

I want to know about RC band pass filter ! more specifically details about the graph of voltage vs frequency.. how the curves goes up and why the curve goes down? I don't understand ... please help me out
3. ### Problems designing an FIR band pass filter on MATLAB?

Homework Statement So I've been tasked with designing and band pass filter for my signals class. We're given the specifications that it needs to go from 200-5000Hz, and we need to use a kaiser window as the window function. Homework Equations There are 2 parameters, beta and N, given by these...
4. ### Derive The Transfer Function from First Principles

All, I need help deriving the Transfer Function of this circuit from first principles. http://i66.tinypic.com/24v3z9s.jpg
5. ### Any sunlight band pass filter for 400-700nm of EM Spectrum?

This 400-700nm slice is the Photosynthetically Active Radiation (PAR) required of plants and, for many applications, there is much unwanted UV and IR heat outside of it. Is there any known translucent material or film that will pass a high % of that 400-700nm wavelength from sunlight while also...
6. ### Filter shape from poles and zeros

Hey guys, I am learning about the filter shapes deduced from the poles and zero plots, however a lot of sources are describing it differently with no logical explanation. I want to know what exactly the poles and zeros do between the range Ω = 0 and Ω = π. One source i read explains if the pole...
7. ### Engineering Where is the bandpass filter in this circuit?

Homework Statement I am doing a project on the Elenco AM/FM superheterodyne radio kit. I have been stuck for ages trying to figure out how the two common emitter amplifiers are tuned to filter out anything that is not around 455 kHz. I tried to find a bandpass filter, or a high-pass and a...
8. ### Boosting FM Band Signals with High Speed Buffers: Op Amp Suggestions?

Hey guys, So I have been running some simulations where I am creating a BPF around the FM band and when I measure the signal on the output, it's much lower than my original signal. So I thought if I put a buffer between the LPF and HPF to electrically isolate the circuits this would help, but...
9. ### Can You Easily Design a Variable Band Pass Filter in the MHz Range?

Is there an easy way of designing a band pass filter whose pass band could be varied over a certain band?? The pass band is in MHz range. Thanks
10. ### Bounds of a band pass filter for image processing

Hi all, I'm working on some image analysis as a part of my research, specifically trying to match images. The method I am using transforms the image into the frequency domain and then applies a band pass (or mesa) filter to eliminate noise and the dc component of the image. I have never...
11. ### Band pass filter and twin-T notch filter

Hi, I've encountered some problem during solved the band pass filter and twin-T notch filter. I don't really understand what the question exactly meant...hope can get some idea in here..thx 1.) A signal conditioning system uses a frequency variation from 6 kHz to 60 kHz to carry...
12. ### Band Pass Filter: Calculate C1=C2 for 17.3 kHz

Homework Statement Given: K=17, R1=R2=6,247 Ohm Calculate the value of C1=C2=C to set the center frequency of the filter to 17.3 kHz.Homework Equations w0 = 1/[C*sqr(Rth*KR2)] from lecture notes R1=RthThe Attempt at a Solution w0 = 1/[C*sqr(Rth*K*R2)] C= 1/[w0*sqr(Rth*K*R2)] C=...
13. ### Band Pass Filter Circuit: Choose Resistor Values with 100nF Capacitors

Homework Statement draw a circuit for a and pass filter using only capacitor and resistors that will transmit signals in the range 200-1500 hertz. if there are only 100 nf capacitors choose resistor values. Homework Equations The Attempt at a Solution i know the circut would...
14. ### Band Pass Filter Transfer Function Analysis

Homework Statement A band Pass filter is given with the following configuration, R-Resistor, C-Capacitor: See Attatchment 1 - Circuit.jpg https://www.physicsforums.com/attachment.php?attachmentid=16241&stc=1&d=1225999965 R1 = R2 = 10 kΩ C1 and C2 are unknown Cut off Frequencies...
15. ### Band pass filter and op-amp problem

Homework Statement Hey guys, quick EE question for ya. This is the end of a signals and noise assignment and i think I've got it but I am not sure so i thought id check. Attached is the question, doing the 2nd part of 13 The part that isn't shown that we need is that the band pass is between...
16. ### What Components Create a 7 kHz Cut-Off Frequency in a Passive Band Pass Filter?

hi there ive been attemping this question and i cannot find the equation to work it out anywhere ! any help would be great ! for a passive band pass filter from the following list choose the three components which would produce a cut off frequency closest to 7 khz and a band width...