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- 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.
- 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。
- quadrature frequency shift modulation 正交移频键控
- frequency shift modulation system 移频调制方式
- audio frequency shift modulation 声音频率偏移调制
- frequency shift modulator 移频调制器
- audio frequency shift modulator 声频移频调制器
- A Demonstration Platform for Frequency Shift Modulated Section Signal 区间移频信号演示台
- Eight information automatic block with audio frequency shift modulated track 八信息移频电源屏
- Analysis and Counter-measure of Code Losing in Audio Frequency Shift Modulated Automatic Block with Long Distance 站内长大区段移频掉码问题的分析及对策
- Current Analysis of Filament Relay for Frequency Shift Modulated 8 Code Automatic Block 8信息移频自动闭塞灯丝继电器的电流分析
- Research on the Improved Plan for 18 Information Non-insulation Frequency Shift Modulated Automatic Blocking System 18信息无绝缘移频自动闭塞系统改进方案的研究
- 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。
- frequency shift modulation 移频调制
- 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。
- 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。
- 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。
- 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。
- Pilot beacon devices are available in the frequency shift and demodulation modes. 飞行员烟火装置在频度变化和解调模态中是可得的。
