Comments on: Example of Cascaded Integrator Comb filter in Matlab http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/ Signal Processing for Communication Fri, 10 Feb 2012 01:03:15 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Krishna Sankar http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-92144 Krishna Sankar Wed, 04 Jan 2012 00:37:39 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-92144 @Bhavani: Hope this matlab code snippet helps. % freq response h_comb = [1 zeros(1,7) -1]; hF = fft(h_comb,1024); plot([-512:511]/1024, 10*log10(abs(fftshift(hF)))) xlabel('normalized frequency'); ylabel('amplitude, dB'); title('Amplitude response of comb filter'); grid on; @Bhavani: Hope this matlab code snippet helps.
% freq response
h_comb = [1 zeros(1,7) -1];
hF = fft(h_comb,1024);
plot([-512:511]/1024, 10*log10(abs(fftshift(hF))))
xlabel(‘normalized frequency’); ylabel(‘amplitude, dB’); title(‘Amplitude response of comb filter’);
grid on;

]]> By: Bhavani http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-87841 Bhavani Thu, 22 Dec 2011 07:01:32 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-87841 i want to plot the magnitude response of comb filter.....anyone help me with Matlab code...Thanks in advance.........cic fiter :) i want to plot the magnitude response of comb filter…..anyone help me with Matlab code…Thanks in advance………cic fiter :)

]]> By: Krishna Sankar http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-56454 Krishna Sankar Thu, 26 May 2011 00:43:58 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-56454 @Alexander: You can insert zeros and then convolve with a rectangular window For eg, xt = [1 zeros(1,2) 2 zeros(1,2) 3 zeros(1,2)]; ht = ones(1,3); yt = conv(xt,ht); @Alexander: You can insert zeros and then convolve with a rectangular window
For eg,
xt = [1 zeros(1,2) 2 zeros(1,2) 3 zeros(1,2)];
ht = ones(1,3);
yt = conv(xt,ht);

]]> By: Alexander http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-53870 Alexander Wed, 27 Apr 2011 13:53:59 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-53870 I'm very interested about the next: You said: "Considering so, do we need to have the filtering hardware when doing interpolation? I do not think so. " Is there a way to replace the block "arrow up, I",with zero-hold block(which passes the value of the input signal to the output instead of inserting a zero between samples). How i can realize that in matlab? I’m very interested about the next:
You said:
“Considering so, do we need to have the filtering hardware when doing interpolation? I do not think so. ”

Is there a way to replace the block “arrow up, I”,with zero-hold block(which passes the value of the input signal to the output instead of inserting a zero between samples).

How i can realize that in matlab?

]]> By: Krishna Sankar http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-39843 Krishna Sankar Sun, 14 Nov 2010 05:34:18 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-39843 @richa: Please provide more details of the problem which you are facing. @richa: Please provide more details of the problem which you are facing.

]]> By: richa http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-39577 richa Tue, 09 Nov 2010 13:00:49 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-39577 hello krishna nice to see your article on cic decimation filter i am having problem with frequency response of cic specifically i want to improve it can you help me i will be highly obiliged hello krishna
nice to see your article on cic decimation filter
i am having problem with frequency response of cic specifically i want to improve it
can you help me i will be highly obiliged

]]> By: VA http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-25700 VA Mon, 12 Apr 2010 04:40:56 +0000 http://www.dsplog.com/2007/07/01/example-of-cascaded-integrator-comb-filter-in-matlab/#comment-25700 hello, In this post krishna has worked on single stage Integrator and comb. and its true that in Hogenauer’s paper – “An economical class of digital filters for decimation and interpolation” he said about multistage implementation. As we increase the number of stages the image/alias rejection will improve. Here in krishna blog N=10 only refers to the number of samples in T duration. I hope this will help. hello,
In this post krishna has worked on single stage Integrator and comb.
and its true that in Hogenauer’s paper – “An economical class of digital filters for decimation and interpolation” he said about multistage implementation.
As we increase the number of stages the image/alias rejection will improve.
Here in krishna blog N=10 only refers to the number of samples in T duration.
I hope this will help.

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