The pulse is collected by photoelectric-sensor,and it is converted into pulse voltage signal through the signal processing circuits of pre-amplifying,LPF,integral comparator and so on,then the pulse voltage signal inputs the single chip microcomputer which can calculate heart-rate and display.
利用光电传感器采集人体脉搏信号,经过前置级放大、滤波、积分比较等信号处理电路,将其转换成脉冲电压信号,再利用单片机对脉冲信号进行处理计算出心率并显示。
Pre-amplification technology is adopted to expand the dynamic range of sampled data, thus improving the system dynamic range.
在给出多阶模拟AGC动态范围极值及影响因素基础上,提出了一种扩大系统动态范围的方法:引入前级放大技术以扩大采样数据动态范围,进而提高系统动态范围。
Pre-amplification technology is adopted to expand the dynamic range of sampled data,thus improving the system dynamic range.
针对采样模块,引入前级放大技术扩大采样数据动态范围,进而提高系统整体动态范围;针对模拟AGC参考电平调整困难及差分比较运算的不足,引入数字电平比对技术,实现输出增益动态可调。
In order to improve the sensitivity measurement of the trace gas concentration, proposed one kind of advanced design of photo-electricity detection of preamplifier circuit applied to this monitoring system, that is, the programmable gain preamplifier circuit of photo-electricity detection.
基于可调谐二极管激光吸收光谱(TDLAS)的痕量气体监测系统,为提高痕量气体浓度的高灵敏度测量,提出应用于此监测系统中的光电检测前置放大电路的一种改进设计,即程控增益光电检测前置放大电路。
The keystones and difficulties during the design and realization of NMR preamplifier for Oil Well Logging System were analyzed.
根据微弱信号检测技术和电路低噪声设计基本原理,结合核磁信号本身信号强度微弱、噪声干扰严重等特性,以及核磁共振测井仪工作环境的特殊性,着重分析了在核磁共振测井仪前置放大器研制过程中其关键电路研制的重点和难点,并给出了相应的电路原理图。
In this paper, problems and related technical measures about structure of acquisition system, preamplifier, power and earthing, which must be considered in designing foreside of high-speed data acquisition system, are discussed.
研究了关于高速数据采集系统前端设计时需考虑的结构、前置放大器、电源和接地等问题及其相应的技术措施,从而为设计高性能的高速数据采集系统提供参考。
booster amplifier
高频前级放大器;辅助放大器;附加放大器;升压放大器
Any noise characteristic of the preamp circuit is attenuated along with the signal, unlike circuits where the volume control is before the input.
与一些音量控制置于输入端的电路不同，这个前级放大器的特征噪声能够随同信号一起衰减。
Characteristics of Strain Release before M7 Earthquakes in Mainland China
中国大陆7级强震前中小地震应变释放特征
A three-stage,low-noise amplifier in frontend of radar receiver
一种接收前端三级低噪声放大器的设计
Mrs. Sephton is now in the second year of her Open University course and is finding it hard work.
目前，塞福顿夫人在学习开放大学二年级的课程，并且学得很吃力。
three level solid state quantum amplifier
三能级固态量子放大器
color burst-amplifier stage
彩色同步脉冲放大级
variable-mu hexode
可变放大系数六级管
Double gain stage logarithmic amplifier
双增益级对数放大器
Purpose: Audio frequency general purpose ,driver stage amplifier applications.
用途:用于音频放大,激励级放大。
Before liberation, the working class was a miserable class.
解放前，工人阶级是一个受苦受难的阶级。
injected-beam forward amplifier
注入式前向波放大管
cathode modulation forward wave amplifier
阴极调制前向波放大管
compound forward-wave amplifier tube
复合型前向波放大管
input loading type preamplifier
输入加载式前置放大器
transistor servo preamplifier
晶体管伺服前置放大器
integrated video preamplifier
集成视频前置放大器
input open type preamplifier
输入开路式前置放大器