Questions tagged [comb]

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How to reliably compute the group delay of a comb filter

I applied the following FIR comb filter in real-time: y[n]=x[n]-x[n-40] Since this is an FIR, the group delay is D=(N-1)/2=20 samples. After applying the filter ...
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1answer
44 views

High order IIR Comb Notch Filter with small Bandwidth - Low atenuation of harmonics

Im filtering an EMG signal, more precisely the 50 Hz frequency and its harmonics. For that, I've constructed a comb notch filter (on filterdesigner in Matlab), with its fundamental frequency being 50 ...
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1answer
113 views

How to use the iircomb filter in matlab

I have a sound file that needs filtering which looks like this: Hence I think that I have noise spaced equally at 832Hz. i tried to use the iircomb filter taken from mathworks website and i managed ...
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1answer
344 views

Bandpass fundamental and harmonics in Matlab

I have a signal in time domain whose sample frequency is Fs=25600. I would like to remove from the fundamental F=285Hz and all its harmonics (2*F,3*F,etc). I tried to use the comb filter in Matlab ...
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1answer
697 views

Sine chorus effect

I want to create a sine chorus effect function in MATLAB where the inputs and the outputs will be: y=chorus(x, f_sine, delay, depth, mix, fs). What I'm trying to do ...
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2answers
360 views

What is the Fourier transform of $\delta(t-a)$

As I know the Fourier transform of $\delta(t)$ is equal to $1$, on the other hand, shift with $a$ in time domain is equal to multiplying with $e^{-jaw}$ so the Fourier transform of $\delta(t-a)$ is ...
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1answer
515 views

Efficient implementation of FIR comb/decimating filter

I'm working on trying to find an efficient way to implement a FIR comb/decimating filter. For a given "prototype" low-pass filter $ H(z)$, a comb that "repeats" $L$ times in the frequency domain can ...
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1answer
215 views

Unit delay operator as parameter in function

I'm busy trying to implement a filter from this paper. I'm a bit confused with one particular step (30e in the paper). Basically I need to find the zero frequency gain (K) of the following whitening/...