Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1994-02-28
1997-09-09
Chin, Stephen
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375261, 375285, 375296, 375298, 375349, 375355, 370483, 348384, H04K 110
Patent
active
056663820
ABSTRACT:
A method and apparatus for communicating over a track circuit which includes an interference signal. The invention includes sampling the interference signal on the track circuit at a predetermined sampling frequency to produce a sampled interference signal, detecting interference at a predetermined first sub-carrier frequency based on a fast Fourier transform of the sampled interference signal, forming a vector signal corresponding to a predetermined second sub-carrier frequency related to the predetermined sampling frequency and different from the predetermined first sub-carrier frequency, performing an inverse fast Fourier transformation on the vector signal to form a series communication signal, coupling the series communication signal to the track circuit, sampling the series communication signal on the track circuit at the predetermined sampling frequency from a sampled communications signal, and recovering the vector signal based on a fast Fourier transform of the sampled communication signal.
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ABB Daimler-Benz Transportation (North America) Inc.
Chin Stephen
Le Amanda T.
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