DSP Filter design using fdesign

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Merida 2020-1-20

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https://ww2.mathworks.cn/matlabcentral/answers/501054-dsp-filter-design-using-fdesign

回答： Andersson Zurita Romero 2020-6-21

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Let's say, I need to design a second order filter with a Fractional delay of 26.17 µs.

I could use the command

d = fdesign.fracdelay(26.17e-06,2);

That works fine.

Now, i also need the same second order filter to be a bandpass filter, which lets through frequencies from 200 Hz to 7000 Hz.

for which i could use

d = fdesign.bandpass('N,F3dB1,F3dB2,BWp', ...
2,1/32,7/8,7000);

is there a way to combine these two designs to get my final filter ?

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Dimitris Kalogiros 2020-1-20

What about to put these two filters into a cascade structure ?

Merida 2020-1-21

Hhmm.. that would not work because when i view the frequency response of the first filter, it cuts most of the frequencies that i want to let through. This probably now becomes a Filter design question.

Can a filter with a fractional delay of 26.17 µs also let through frequncies 200 - 7000 Hz ? .

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Answer 1

Andersson Zurita Romero 2020-6-21

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此回答的直接链接

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A_stop1 = 60; % Attenuation in the first stopband = 60 dB F_stop1 = 8400; % Edge of the stopband = 8400 Hz F_pass1 = 10800; % Edge of the passband = 10800 Hz F_pass2 = 15600; % Closing edge of the passband = 15600 Hz F_stop2 = 18000; % Edge of the second stopband = 18000 Hz A_stop2 = 60; % Attenuation in the second stopband = 60 dB A_pass = 1;