Sinewave analysis in LPF

2011 8 3
3 个回答
9 次查看（30 天）

0 个投票

[EDIT: 20110808 10:29 CDT - reformat - WDR]
i have designed a LPF with the following spec.
%Low frequncy range BPF --------its actually a low pass filter with passband ripple=0.7db,stopband ripple=90db, passband=1000hz, stopband=1200hz.
My doubt is i have generated simulated sine wave with following spec.
fs = 20481; %sampling freq.
input_freq = 400;
t = 0:(1/fs):((1/fs)* (20481));
u = (0.7* sin(2*pi*input_freq*t));
whether i can give this simulated sinewave to my LPF design. If possible how to calculate the order of the filter and filter coefficient.
Here i am using firpmord() to calculate the order and firpm()for the fir.

请先登录，再回答此问题。

回答（3 个）

Honglei Chen
Honglei Chen 2011-8-8

0 个投票

Hi Venkatesh,
I don't quite understand your question. Since you already used firpmord and firpm, then you already have the order and filter coefficients. Then you can use filter() command to pass your signal through the filter.
HTH
venkatesh P
venkatesh P 2011-8-9

0 个投票

Whether i can use covolution? conv(input_Signal,Filter_coefficients)
Honglei Chen
Honglei Chen 2011-8-9

0 个投票

You can do that too, since firpm gives an FIR filter.

类别

在 帮助中心 和 File Exchange 中查找有关 Digital Filter Design 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by