fir2(signal)
fir2()所属R语言包:signal
FIR filter generation
FIR滤波器生成
译者:生物统计家园网 机器人LoveR
描述----------Description----------
FIR filter coefficients for a filter with the given order and frequency cutoffs.
一个给定的顺序和截止频率的滤波器FIR滤波器系数。
用法----------Usage----------
fir2(n, f, m, grid_n = 512, ramp_n = grid_n/20, window = hamming(n + 1))
参数----------Arguments----------
参数:n
order of the filter (1 less than the length of the filter)
滤波器的阶数(1的过滤器的长度小于)
参数:f
band edges, strictly increasing vector in the range [0, 1] where 1 is the Nyquist frequency. The first element must be 0 and the last element must be 1. If elements are identical, it indicates a jump in frequency response.
带的边缘,严格矢量的范围是[0,1],其中1是奈奎斯特频率。第一个元素必须为0,最后一个元素必须是1。如果元素是相同的,它表示在频率响应的跳转。
参数:m
magnitude at band edges, a vector of length(f).
带边缘,大小的向量length(f)。
参数:grid_n
length of ideal frequency response function defaults to 512, should be a power of 2 bigger than n.
理想的频率响应函数默认长度为512,应该是一个功率大于n。
参数:ramp_n
transition width for jumps in filter response defaults to grid_n/20. A wider ramp gives wider transitions but has better stopband characteristics.
跳跃的滤波器响应默认grid_n/20的转变宽度。一个更广泛的斜坡提供了更广泛的过渡,但有更好的阻带特性。
参数:window
smoothing window. The returned filter is the same shape as the smoothing window.
平滑窗口。返回的滤波器是相同的形状的平滑窗口。
值----------Value----------
The FIR filter coefficients, an array of length(n+1), of class Ma.
的FIR滤波器的系数,一个数组length(n+1),类Ma。
(作者)----------Author(s)----------
Original Octave version by Paul Kienzle,
<a href="mailto:pkienzle@user.sf.net">pkienzle@user.sf.net</a>. Conversion to R by Tom Short.
参考文献----------References----------
参见----------See Also----------
filter, Ma,
filter,Ma,
实例----------Examples----------
f <- c(0, 0.3, 0.3, 0.6, 0.6, 1)
m <- c(0, 0, 1, 1/2, 0, 0)
fh <- freqz(fir2(100, f, m))
op <- par(mfrow = c(1, 2))
plot(f, m, type = "b", ylab = "magnitude", xlab = "Frequency")
lines(fh$f / pi, abs(fh$h), col = "blue")
# plot in dB:[图以dB为单位:]
plot(f, 20*log10(m+1e-5), type = "b", ylab = "dB", xlab = "Frequency")
lines(fh$f / pi, 20*log10(abs(fh$h)), col = "blue")
par(op)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注:
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