英语翻译Figure 1.7:Block-Diagram of signal processing in ACE sch

英语翻译
Figure 1.7:Block-Diagram of signal processing in ACE scheme.
channel,where ( ) r s t is the filter output in one channel,( ) i s t is the Hilbert
transform of ( ) r s t .The Hilbert envelope is the magnitude of the analytic signal
( ) ( ) ( )2 ( )2 r i Atst s t s t [Ville,1948].In practice,the Hilbert transform is
often combined with the band-pass filtering using complex filters whose real and
imaginary parts are in quadrature,such as in a FFT.
A logarithmic transformation is used to map the relatively wide dynamic range of
derived envelope signals (in the order of 30 dB,but some processors allow up to 80
dB) onto the narrow dynamic range of electrically evoked hearing (in the order of 2
to 15 dB,depending on the subject and stimulus conditions).The dynamic range is
defined by the difference from the T-level to the C-level.The T-level corresponds to
the minimal electrical current that is required to elicit an auditory sensation in the
particular patient and for the particular channel.The C-level corresponds to the level
of the electrical current required to elicit a relatively loud but still comfortable
auditory sensation.A second function of the compression is to remove the difference
in loudness growth between acoustic hearing and electric hearing.In acoustic
hearing loudness is a compressive function of intensity,while in an electric hearing
loudness grows very rapidly (exponentially) with increasing current intensity [Zeng
and Shannon,1994].
The compressed channel outputs are used to modulate trains of biphasic pulses.The
modulated pulse trains are applied through the RF transmission link to the
corresponding electrodes in the cochlea.Pulse trains derived from low-frequency
channels are directed to apical electrodes in the implant,and pulse trains derived
from high-frequency channels are directed to basal electrodes in the implant.
A key feature of the CIS strategy [Wilson et al.,1991],and related strategies,is that
none of the various pulses on the channels overlap in time,but that they are
interleaved.This eliminates a major component of interaction among channels that
otherwise would be produced through vector summation of the electrical fields from
different (simultaneously stimulated) electrodes.Such interaction would be expected
to reduce the salience of channel-related cues.

图1.7 ：块图的信号处理中的ACE的计划.
通道,在那里（ ）第一是在一个过滤器的输出通道,（ ） 29日是希尔伯特
变换（ ）规科技.的Hilbert信封大小的解析信号
（ ） （ ） （ ） 2 （ ） 2日在圣   圣圣[市,1948 ] .在实践中,希尔伯特变换
往往结合带通滤波使用复杂的过滤器,其真正的和
虚部是正交,如在一个变换.
对数变换用于地图相对宽动态范围的
衍生信封信号（在该命令的30分贝,但一些处理器允许多达80
分贝）到窄动态范围电诱发听（按2
到15分贝,根据主题和刺激的条件） .的动态范围
所界定的不同的T -级到C级.T型水平对应
最小电流是一个需要引起听觉的
特别是病人和特别通道.这架C -级别相对应的级别
电流的要求,争取一个相对舒适的响亮,但仍
听觉.的第二个作用是消除压缩的区别
在响度增长之间的声学和电听证会听证.声学
响度是听觉功能的压缩强度,而在电动听证
响度增长十分迅速（指数）的增加电流强度[增
和Shannon ,1994 ] .
压缩通道输出是用来调节列车双相脉冲.那个
调制脉冲列车适用于通过射频传输连结
相应的电极在耳蜗.脉冲列车来自低频
渠道是针对心尖电极植入,并产生脉冲列车
从高频率频道是针对基底电极植入.
一个主要特点独联体战略[威尔逊等人.,1991 ] ,以及有关的战略,是
没有各种豆类的渠道重叠的时间,但他们
交错.这消除了一个主要组成部分之间的互动渠道
否则会产生通过矢量求和的电气领域,从
不同的（同时刺激）电极.这种互动将预期
减少渠道的显着相关的线索.