comparison of different IIR filter design techniques in matlab

[@krystalgailsuyod5777]

Hi may I know where did you get that order, cutoff and ripple? thanks.

[@Tamodeep123]

really apreciate your videos..they have been a great help..
i have one question..pleeeeeeeease can you help me out on this
i need to hide some data by manipulating the phase of an audio...how can i change the phase values by small amounts and recreate the audio?? please your help is highly required

[@mmuuuuhh]

I think there are also different group delays,e.g. the filters have different affect on the phases.
You don't want to make a follow up video, comparing the filters on that aspect?
;)

[@StoriesoftheSoul1018]

Sir I am having an error
undefined function 'create_signal_flow'
Can u plz guide me

[@ddorran]

It's available at dadorran.wordpress.com/2012/09/26/create_signal_flow/

[@StoriesoftheSoul1018]

@@ddorran THANK YOU so much Sir. I need it to code this first or what to do , can u please guide me please sir
Have a great day

[@youcefghibeche]

thank you for your video, it was really clear. I have a question, i want to design an IIR filter but using an optimization technics (the PSO) but i have a problem with the cost function (the error between the desired and actual responses of the filter that i'm going to minimize), i couldn't create it.
can you please help me.
regards

[@nicolamelone5351]

Hi, the video is really clear. I want to ask something about the function "butter" to create a passband filter. I noticed that if I use a lower frequency limit really close to the upper frequency limit, the order of the filter can't be really high otherwise instead of 0 dB in that band I "boost" the signal and a lot. Why?I am approaching to the filter design, thus my question might be really naive. By the way I need to ask. Thank you :)

[@ddorran]

+Nicola Melone Can you post the code you are using?

[@nicolamelone5351]

[f1,f2]=butter(Order,[f_low(g) f_up(g)],'bandpass');
H=freqz(f1,f2,,200000);
The signal is in a ".mat" file. Do I need to send it to you? Thanks:)

[@nicolamelone5351]

tthe number 2e5 is given by the half of the length of vector at which I have to apply the fft.

[@nicolamelone5351]

try with : f_low= 3.5e-05 and f_up=4.45e-05. The values are so small as the fft has a really wide range that I am not able to reduce.

[@ddorran]

What is the value of the variable Order? Where does the fft come in?

[@Jalloboy]

thanks for the clear explanation .... con you please help me with the code I tried following the link but all I got is error message thanks

[@ddorran]

Whats the error message you get?

[@jyothiguntamukkala9392]

sir how to PSO for power low pass fiter please tell

[@vdemongod]

I want to shower my love to you right now