# Questions tagged [lowpass-filter]

A low-pass filter is an electronic filter that passes low-frequency signals but attenuates signals with frequencies higher than the cutoff frequency.

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### The Effect of Lowpass Filter Order on BER of a simple FSK Modulation (MATLAB)

I am going to simulate BER of a simple system incorporating 4FSK modulation in MATLAB. I have encountered a strange behavior in my lowpass filter. I'm seeing that as the order of the lowpass filter ...
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### My beat detection algorithm via a low pass filter is bad. Looking for tips for improvement with good trade-off between complexity and accuracy

In spring, I built a beat detection algorithm in Rust. It works for very simple songs but the problem is that I have to adjust the parameters of the algorithm manually for each genre and sometimes for ...
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### Do we use calculator in radians or degree while calculating prewarping analog frequency in Bilinear Transformation?

Say $\omega_s=1.96\;,\omega_p=0.785$ For bilinear transformation-: $\Omega_p=2/T*tan(\omega_p/2)$ $\Omega_s=2/T*tan(\omega_s/2)$ Should I put my calculator in radian mode or degree mode. I believe it ...
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### Do we guess the cut off frequency when passband edge frequency and stop band edge frequency are given? FIR Filter design-LOW PASS FILTER

Say passband edge frequency=0.25 $\pi$ Stopband edge frequency=0.35 $\pi$ What is the cut off frequency? Do we average these 2 frequencies and write the answer or what is the procedure to find cut off ...
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### How to identify low pass, bandpass, band reject, high pass filter etc from given $|H(e^{jw}|$?

1) How is this a low pass filter? $0.99 \leq |H(e^{jw}\;)|\leq1.01 for \; 0\leq|w|\leq0.19\pi$ $|H(e^{jw}\;)|\leq0.01\;for\; 0.21\pi\leq|w|\leq\pi$ 2) What kind of filter is this? Low pass, high pass, ...
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### Butterworth Filter Transfer Function

Butterworth Filter frequency response is given as: $$H_a(j\Omega)=\frac{1}{\sqrt{{1+\left(\frac{\Omega}{\Omega_c}\right)^{2N}}}}\quad \text{where N is the order of the filter}$$ and for the transfer ...
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### Block diagram of M-PSK modulation and demodulation

I have come across this quadrature modulator block diagram in many books and websites: I've read that the quadrature modulator allows to realize many different digital modulations, including ...
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### How to apply an anti-aliasing filter before downsampling

I have an eeg signal with two channels (f3m2 and f4m1) which is divided into epochs. I want to augment the data by taking every 5th sample. I can re-use the discarded samples to create 5 versions of ...
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### Sinc3 Filter in FPGA

I working on FPGA block which requires an Sinc3 Filter for Sigma-Delta ADC coming in. I read about it and Sinc filter, is filter with frequency response of sinc, that means its just a moving average ...
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### Why use both a high pass and a low pass filter in a Butterworth implementation for noise reduction?

I am a new to audio processing . I want to develop an application that reduces audio noise using a Butterworth filter. I found some existing code doing this, but I still do not understand the use of ...