cheb1ord(signal)
cheb1ord()所属R语言包:signal
Chebyshev type-I filter order and cutoff
切比雪夫I型滤波器阶数和截止
译者:生物统计家园网 机器人LoveR
描述----------Description----------
Compute discrete Chebyshev type-I filter order and cutoff for the desired response
计算离散切比雪夫I型滤波器的阶数和截止所需的响应
用法----------Usage----------
cheb1ord(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:Rp
allowable decibels of ripple in the pass band
在通带内的允许分贝纹波
参数:type
filter type, one of “low”, “high”, “stop”, or “pass”
过滤器类型,一个“低”,“高”,“停止”,或“通行证”
This object can be passed directly to cheby1 to compute filter coefficients.
这个对象可以被直接传递给cheby1计算滤波器系数。
(作者)----------Author(s)----------
Original Octave version by Paul Kienzle,
<a href="mailto:pkienzle@user.sf.net">pkienzle@user.sf.net</a> and by Laurent S. Mazet. Conversion to R by Tom Short.
参考文献----------References----------
参见----------See Also----------
cheby1, FilterOfOrder, buttord
cheby1,FilterOfOrder,buttord
实例----------Examples----------
Fs <- 10000
chord <- cheb1ord(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)")
ch1 <- cheby1(chord)
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(-10,0), xlim = c(0,2000))
hf <- freqz(ch1, 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:
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