ellipord(signal)
ellipord()所属R语言包：signal
Elliptic filter order and cutoff
椭圆滤波器的阶数和截止
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Compute discrete elliptic filter order and cutoff for the desired response
计算离散椭圆滤波器的阶数和截止所需的响应
用法----------Usage----------
ellipord(Wp, Ws, Rp, Rs)
参数----------Arguments----------
参数：Wp, Ws
pass-band and stop-band edges. For a low-pass or high-pass filter, Wp and Ws are scalars. For a band-pass or band-rejection filter, both are vectors of length 2. For a low-pass filter, Wp < Ws. For a high-pass filter, Ws > Wp. For a band-pass (Ws[1] < Wp[1] < Wp[2] < Ws[2]) or band-reject (Wp[1] < Ws[1] < Ws[2] < Wp[2]) filter design, Wp gives the edges of the pass band, and Ws gives the edges of the stop band. Frequencies are normalized to [0,1], corresponding to the range [0, Fs/2].
通带和阻带的边缘。低通或高通滤波器，Wp和Ws是标量。对于一个带通或带阻滤波器中，两个向量的长度为2。对于一个低通滤波器，Wp < Ws。对于一个高通滤波器，Ws > Wp。对于带通（Ws[1] < Wp[1] < Wp[2] < Ws[2]）或带阻（Wp[1] < Ws[1] < Ws[2] < Wp[2]）滤波器的设计，Wp给出的通带的边缘，和Ws给出的边缘阻带。频率被归一化到[0,1]，对应的取值范围为[0，Fs / 2的]。
参数：Rp
allowable decibels of ripple in the pass band.
允许分贝的通带中的纹波。
参数：Rs
minimum attenuation in the stop band in dB.
以dB为单位的阻带中的最小衰减。
值----------Value----------
An object of class FilterOfOrder with the following list elements:
对象的类FilterOfOrder下面的列表元素：
参数：n
filter order
滤波器的阶数
参数：Wc
cutoff frequency
截止频率
参数：type
filter type, one of "low", "high", "stop", or "pass"
过滤器类型，一个"low"，"high"，"stop"或"pass"
参数：Rp
dB of pass band ripple
dB的通带纹波
参数：Rs
dB of stop band ripple
dB的阻带纹波
This object can be passed directly to ellip to compute discrete filter coefficients.
这个对象可以通过直接向ellip来计算的分立式滤波器系数。
（作者）----------Author(s)----------
Original Octave version by Paulo Neis
<a href="mailto:p_neis@yahoo.com.br">p_neis@yahoo.com.br</a>.
Modified by Doug Stewart. Conversion to R by Tom Short.
参考文献----------References----------
参见----------See Also----------
Arma, filter, butter,
Arma，filter，butter，
实例----------Examples----------
Fs <- 10000
elord <- ellipord(1000/(Fs/2), 1200/(Fs/2), 0.5, 29)
plot(c(0, 1000, 1000, 0, 0), c(0, 0, -0.5, -0.5, 0),
type = "l", xlab = "Frequency (Hz)", ylab = "Attenuation (dB)")
el1 <- ellip(elord)
plot(c(0, 1000, 1000, 0, 0), c(0, 0, -0.5, -0.5, 0),
type = "l", xlab = "Frequency (Hz)", ylab = "Attenuation (dB)",
col = "red", ylim = c(-35,0), xlim = c(0,2000))
lines(c(5000, 1200, 1200, 5000, 5000), c(-1000, -1000, -29, -29, -1000),
col = "red")
hf <- freqz(el1, Fs = Fs)
lines(hf$f, 20*log10(abs(hf$h)))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-9-30 02:08:51
