Demodulation of Frequency-Shifting Signals of
Automatic Block System with PLL

XIANG Jun

Volume 17 Issue 6

Dec. 2004

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Article Contents

Journal of Southwest Jiaotong University > 2004 > 17(6): 784-787.

XIANG Jun. Demodulation of Frequency-Shifting Signals ofAutomatic Block System with PLL[J]. Journal of Southwest Jiaotong University, 2004, 17(6): 784-787.

Citation:

XIANG Jun. Demodulation of Frequency-Shifting Signals of Automatic Block System with PLL[J]. Journal of Southwest Jiaotong University, 2004, 17(6): 784-787.

XIANG Jun. Demodulation of Frequency-Shifting Signals ofAutomatic Block System with PLL[J]. Journal of Southwest Jiaotong University, 2004, 17(6): 784-787.

Citation:

XIANG Jun. Demodulation of Frequency-Shifting Signals of Automatic Block System with PLL[J]. Journal of Southwest Jiaotong University, 2004, 17(6): 784-787.

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Demodulation of Frequency-Shifting Signals of Automatic Block System with PLL

XIANG Jun

Publish Date: 25 Dec 2004

Abstract

Abstract

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. Experiment showed that the demodulation system can not only reduce the low-frequency pulses from the received signals, but also effectively depress the noises induced in the track circuits and achieve high signal-noise ratio.
- demodulation,
- automatic block with audio frequency shift modulated track circuit,
- frequency shift keying,
- phase-locked loop