scholarly journals The signal demodulation techniques

Author(s):  
Yassine Amirat ◽  
Mohamed Benbouzid
Keyword(s):  
2012 ◽  
Vol 532-533 ◽  
pp. 827-831
Author(s):  
Jiang Hua Xia ◽  
Jing Guo ◽  
Xiao Ming Wang

The Frequency-Shift Keying (FSK) signal is frequently used in track circuits because of the strong ability of resistance interference. Symbol rate is one of the important signal parameters for safety of railway. The paper propose a algorithm of high precise detectation of FSK signal using Chirp-Z transform; Theoretically gives the detailed explanation to the major technique, and has carried on the Matlab simulation, The simulation result indicates this method during the enhancement is shifted signal examination precision, reduced the computation order of complexity.


2013 ◽  
Vol 819 ◽  
pp. 155-159
Author(s):  
Peng Wang ◽  
Huai Xiang Ma

Fault diagnosis of train bearing is an important method to ensure the security of railway. The key to the fault diagnosis is the method of vibration signal demodulation. The local mean decomposition (LMD) is a self-adapted signal processing method which has a good performance in nonlinear nonstationary signal demodulation. The improved LMD method based on kurtosis criterion can prevent errors in the process of calculating the product functions. With the verification of simulation and wheel set experiment, the improvement method has been certified usefully in practical application.


2012 ◽  
Vol 236-237 ◽  
pp. 61-66
Author(s):  
R.M. Tao ◽  
X. Tao ◽  
C.R. Xiong

This article describes a method to detect the position and speed in a rotary transformer pole AC synchronous motor. This method gives the pole position and velocity signal demodulation circuit and analyses the demodulation principle. After practical testing, this approach is reliable with high detection accuracy. Therefore, it is fully able to meet the needs of CNC machine tools with high performance in AC server system.


2012 ◽  
Vol 23 (7) ◽  
pp. 074004 ◽  
Author(s):  
T Hausotte ◽  
B Percle ◽  
U Gerhardt ◽  
D Dontsov ◽  
E Manske ◽  
...  

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