design(fdesign.lowpass()) vs dsp.Filter(firpm())
Hello,
I am trying to design a very strict LPF. Some of the design parameters are Fs 1000Hz and Fpass 0.5Hz and Fstop 1Hz with 0.01 passband ripple and 110 db stopband attenuation.
When I try to design this filter with the FDAtool, the tool takes some time but designs a ~10k tap FIR filter. If I select to generate MATLAB code for this design, the code is generated using firpm().
When I try to use the fdesign.lowpass() with the same specification and then with design( ‘equiripple’) the method does not converge (I let the design run for some time and no output is given).
My question is, what is the difference between these two methods and why cant I design the specified filter with the fdesign.lowpass ?Hello,
I am trying to design a very strict LPF. Some of the design parameters are Fs 1000Hz and Fpass 0.5Hz and Fstop 1Hz with 0.01 passband ripple and 110 db stopband attenuation.
When I try to design this filter with the FDAtool, the tool takes some time but designs a ~10k tap FIR filter. If I select to generate MATLAB code for this design, the code is generated using firpm().
When I try to use the fdesign.lowpass() with the same specification and then with design( ‘equiripple’) the method does not converge (I let the design run for some time and no output is given).
My question is, what is the difference between these two methods and why cant I design the specified filter with the fdesign.lowpass ? Hello,
I am trying to design a very strict LPF. Some of the design parameters are Fs 1000Hz and Fpass 0.5Hz and Fstop 1Hz with 0.01 passband ripple and 110 db stopband attenuation.
When I try to design this filter with the FDAtool, the tool takes some time but designs a ~10k tap FIR filter. If I select to generate MATLAB code for this design, the code is generated using firpm().
When I try to use the fdesign.lowpass() with the same specification and then with design( ‘equiripple’) the method does not converge (I let the design run for some time and no output is given).
My question is, what is the difference between these two methods and why cant I design the specified filter with the fdesign.lowpass ? filter design MATLAB Answers — New Questions
