Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1983-05-12
1985-12-24
LaRoche, Eugene R.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329110, 329137, 329145, 329167, 455214, 455337, H03D 300, H03D 302
Patent
active
045609438
ABSTRACT:
An F.M. demodulator of the phase quadrature type is adapted for fail-safe operation and in particular for use in a railway signalling system. A Bessel band-pass filter is chosen for the design basis of the phase delay arm, its characteristics, failure modes and resulting effects are considered and the design adaptations required to avoid the potentially unsafe effects of failures are determined. Due to loss of failure in the unmodified filter design the slope of the phase characteristic can increase effectively broadening the filter bandwidth and reducing attenuation of out-of-band signals which could, as a result, provide a false output. The demodulator may be combined with a fiber-optic link to form part of a complete signaling transmission system.
REFERENCES:
patent: 2891156 (1959-06-01), Crow
patent: 3748586 (1973-07-01), Johnson et al.
patent: 3764927 (1973-10-01), Allinger et al.
patent: 4119919 (1978-10-01), Sugawara
patent: 4198609 (1980-04-01), Ishigaki et al.
patent: 4339726 (1982-07-01), Miura
Badge Roger
Cowen David W.
Negus Paul D.
Ng Tak C.
LaRoche Eugene R.
Mis D. C.
Sotak J. B.
Westinghouse Brake & Signal Co. Ltd.
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