Parks - McClellan filter design

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Cagdas
Cagdas 2013-12-15
编辑： Wayne King 2013-12-15
Hi all,
We are asked to design a Parks-McClellan filter with the following specifications,I tried to use firgr and firpm methods however, couldn't be sure how to apply the specifications to the command.
passband filter edge = 2kHz stopband filter edge = 2.5 kHz passband tolerance = stopband tolerance = 0.05 sampling frequency = 8 kHz.
Thanks.

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Wayne King
Wayne King 2013-12-15
编辑：Wayne King 2013-12-15
If you use fdesign.lowpass with a minimum order design, the default design is the PM equiripple method
To convert the passband tolerance and stopband tolerances to passband ripple in dB and stopband attenuation
Rp = -20*log10((1-0.05)/(1+0.05));
Ast = -20*log10((0.05)/(1+0.05));
Fs = 8000;
d = fdesign.lowpass('Fp,Fst,Ap,Ast' ,2e3,2.5e3,Rp,Ast,Fs);
Hd = design(d);
The above will call firpm()

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