prepComb(tuneR)
prepComb()所属R语言包：tuneR
Preparing the combination/concatenation of Wave objects
，准备组合/波对象的串联
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Preparing objects of class Wave for binding/combination/concatenation by removing small amounts at the beginning/end of the Wave in order to make the transition smooth by avoiding clicks.
准备类的对象Wave的绑定/组合/级联为了使平滑过渡，避免点击，除去少量的浪潮的开始/结束。
用法----------Usage----------
prepComb(object, zero = 0, where = c("both", "start", "end"))
参数----------Arguments----------
参数：object
Object of class Wave.
对象类Wave。
参数：zero
The zero level (default: 0) at which ideal cut points are determined (see Details). A typical alternative would be 127 for 8 bit Wave objects. If zero=NA, the mean of the left Wave channel is taken as zero level.
零级（默认值：0），在理想的切点确定（见详情）。一个典型的另一种方法是127为8位Wave对象。如果zero=NA，左波信道的平均值的零电平被取为。
参数：where
One of “both” (default), “start”, or “end” indicating at where to prepare the Wave object for concatenation.
“既”（默认），“开始”，或“结束”，表示在where准备Wave对象串联的。
Details
详细信息----------Details----------
This function is useful to prepare objects of class Wave for binding/combination/concatenation. At the side(s) indicated by where small amounts of the Wave are removed in order to make the transition between two Waves smooth (avoiding clicks).
此功能是非常有用的对象的类Wave绑定/组合/级联。在侧面（S）表示where少量的波被删除，以使两波之间的平滑过渡（避免点击）。
This is done by dropping all values at the beginning of a Wave before the first positive point after the zero level is crossed from negative to positive. Analogously, at the end of a Wave all points are cut after the last negative value before the last zero level crossing from negative to positive.
这是通过在开始的波前删除所有值后的第一个积极的角度zero水平由负到正穿过。类似地，结束时的波点被切断后，最后负值前的最后zero平交路口由负到正。
值----------Value----------
An object of class Wave.
对象的类Wave。
注意----------Note----------
If stereo, only the left channel is analyzed while the right channel will be simply cut at the same locations.
如果立体声，左声道分析，在相同的位置，而右边的通道将被简单地削减。
（作者）----------Author(s)----------
Uwe Ligges, <a href="mailto:ligges@statistik.tu-dortmund.de">ligges@statistik.tu-dortmund.de</a>,
based on code from Matthias Heymann's former package ‘sound’.
参见----------See Also----------
bind, Wave-class, Wave, extractWave, and noSilence to cut off silence
bind，波级，Wave，extractWave，noSilence切断沉默
实例----------Examples----------
Wobj1 <- sine(440, duration = 520, bit = 16)
Wobj2 <- extractWave(sine(330, duration = 500, bit = 16), from = 110, to = 500)
par(mfrow = c(2,1))
plot(bind(Wobj1, Wobj2), xunit = "samples")
abline(v = 520, col = "red") # here is a "click"![这里是一个“点击”！]
# now remove the "click" by deleting a minimal amount of information:[现在可以删除“，单击”删除少量的信息：]
Wobj1 <- prepComb(Wobj1, where = "end")
Wobj2 <- prepComb(Wobj2, where = "start")
plot(bind(Wobj1, Wobj2), xunit = "samples")
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 2012-10-1 13:03:24
