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- signal frequency shift 信号频移
- According to the laser gain change is linear related to the frequency shift, the Doppler frequency is extracted by the signal processing. 根据激光的增益变化和频率变化成线性关系，可以对信号进行处理求出多普勒频移。
- Signal demodulation of automatic block with audio frequency shift modulated track circuits was implemented with phase-locked loop( PLL) technique and a singe chip microcomputer. 利用锁相环(LL)窄带跟踪特性;与单片机结合;实现自动闭塞系统移频信号解调.
- Then after amplitude limiting, to be preamplified, demodulated, bandpass filtered, the doppler frequency shift signal is extracted. 经过限幅保护，接收放大，检波和带通滤波后，将多普勒频移信号提取出来。
- Massively uses the frequency Shift Keying Signal（FSK） in our country locomotive control signal to transmit each kind of locomotive speed information. 摘要 在我国机车控制信号中大量采用移频键控信号（FSK）来传送各种机车速度控制信息。
- Based on the discussion of the topological structure of a superheterodyne FM receiver, a one chip FM receiver for FSK(Frequency Shift Keying) signal has been designed. 在分析超外差 FM中频接收拓扑结构的基础上 ,设计出一种用于 FSK(移频键控 )信号的单片FM中频接收电路系统。
- This paper concerns relative technologies about carrier frequency synchronization and estimation in downlink signal in large doppler frequency shift condition. 本文对大多普勒频移情况中，下行信号载波频率同步估计的相关技术进行了研究。
- On the base of reducing the problem, this paper put forward the idea improving bonding circuit to automatic block with audio frequency shift modulated track circuit and other signal equipmemt on the Hu Hang and Zhe Gan line. 在减少自动闭塞初期故障的基础上，对沪杭、赣线移频自动闭塞与其他信号设备的结合电路，提出了改进意见和实施措施。
- The factors affecting on the measurement accuracy of Brillouin frequency shift are analyzed, the relation between the measurement of Brillouin frequency shift and signal to noise (SNR) is obtained. 分析了影响布里渊频移测量精度的因素，给出了布里渊频移测量精度和信噪比的关系。
- In pulse code modulation,a spurious signal formed from beats between the signal frequency and the sample frequency. 在脉冲编码调制中,信号频率和取样频率之间的差拍所引起的伪信号。
- The earth's rotation and its motion around the sun add an appreciable frequency shift. 地球自转与地球绕日公转产生附加的频移。
- This instrument can measure AC signal frequency either of the single phase voltage or of the tri-phase voltage. 本表既可测交流单相电压信号之频率,亦可测交流三相电压信号之频率。
- The high permeability of the ferromagnetic reeds in a reed relay causes a pronounced skin effect with increasing signal frequency. 干簧式继电器中铁磁簧片的高磁导率会随信号频率的增加而产生很强的趋肤效应。
- The Brillouin frequency shift can be precisely measured by changing the local frequency and adopting narrow filter. 通过改变本地电信号的频率对信号进行扫描和窄带滤波，从而实现了布里渊频移的精确测量。
- The scheme of measuring Brillouin frequency shift in fiber sensor based on edge optical filter is proposed. 提出了采用边缘光滤波器来测量光纤传感中布里渊频域的方案。
- In pulse code modulation, a spurious signal formed from beats between the signal frequency and the sample frequency. 在脉冲编码调制中,信号频率和取样频率之间的差拍所引起的伪信号。
- The results show,the light frequency shift can be effectively r educed in the sharp angle laser light pumping scheme. 结果表明斜光抽运方案可以有效降低铯原子束频标中的光频移。
- It has sharp impedance characteristics at desirable frequency and it does affect the signal frequency. 在某一频率区域内，其阻抗值急剧上升，从而在特定的频率内可获得较高的衰减速效果而对信号不产生影响。
- This paper describes the design and the test results of Gaussian frequency shift keying for bluetooth. 介绍了一种用于蓝牙芯片的高斯滤波移频键控的设计和测试结果。
- A false signal in telecommunication links from beats between signal frequency and sampling frequency. 假信号信号频率和取样频率之间的拍子在无线电通信线路产生的假信号。
