Questions tagged [comb]
8 questions
2
votes
2 answers
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 equal to $e^{-jaw}$, but on the other hand the…
user137927
- 349
- 8
- 16
2
votes
1 answer
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 be constructed by upsampling (stuffing $L-1$ zeros…
roberto
- 99
- 1
- 9
1
vote
1 answer
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 Hz, sampling frequency of 10kHz, and notches's…
Mariana Mourão
- 11
- 1
1
vote
1 answer
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 using this code…
chsafouane
- 183
- 1
- 2
- 8
1
vote
1 answer
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/comb filter:
The relevant steps in the algorithm…
Pokey McPokerson
- 258
- 1
- 10
0
votes
3 answers
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 to a signal, I tried to use cross correlation between the filtered and unfiltered…
Chika
- 83
- 2
- 7
0
votes
1 answer
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 to create this:
clear
fs = 44100;
fo = fs/53;
q =…
Scavenger23
- 197
- 1
- 8
0
votes
1 answer
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 is shown in this picture
where $M$ is my $M$ sample delay operator and its given:…
Gensdimi
- 25
- 7