FIR filter has output of same length as its input?
2 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Nader Rihan
el 27 de Dic. de 2020
Comentada: Nader Rihan
el 27 de Dic. de 2020
If the input signal has length L samples, impulse repsonse has length M samples, entering these L samples to FIR filter using conv function, will get L+M-1 output samples, while entering these L samples to FIR fitler, the output has L samples only instead of L+M-1 samples . Also, I'd like to know which L samples does FIR filter choose from L+M-1 samples (total samples) to be its output ?.
0 comentarios
Respuesta aceptada
Bruno Luong
el 27 de Dic. de 2020
Editada: Bruno Luong
el 27 de Dic. de 2020
There is the the difference equation in the "Rational Transfer Function" part of the doc. x(i) with i<=0 are supposed to be 0.
and you can figure out easily just by experiment
>> x=rand(1,10)
x =
0.1576 0.9706 0.9572 0.4854 0.8003 0.1419 0.4218 0.9157 0.7922 0.9595
>> b=rand(1,3)
b =
0.9340 0.6787 0.7577
>> conv(x,b) % <= 'full' option
ans =
0.1472 1.0135 1.6722 1.8385 1.8022 1.0435 1.0966 1.2491 1.6810 2.1277 1.2515 0.7270
>> filter(b,1,x)
ans =
0.1472 1.0135 1.6722 1.8385 1.8022 1.0435 1.0966 1.2491 1.6810 2.1277
Más respuestas (0)
Ver también
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!