H - Electricity – 03 – D
Patent
H - Electricity
03
D
325/36
H03D 3/00 (2006.01) H04L 27/14 (2006.01)
Patent
CA 1095991
ABSTRACT OF THE DISCLOSURE A frequency modulated-data communications receiver for use in a system where digital signals are used to frequency modulate a carrier is disclosed. Any information loss caused by phase or amplitude distortion is detected automatically in two mutually supplementary arrangements. One supplementary arrangement is in the form of a dynamic distortion corrector including a frequency discriminator and the other is in the form of a static distortion corrector comprising an amplitude demodulator connected in parallel with the frequency discriminator. The outputs of the demodulator and dis- criminator are connected to respective inputs of a change-over switching cir- cuit under the control of an amplitude modulation-analysis device. When this device senses that the amplitude modulation level exceeds a given value it causes switching of a common output to the amplitude demodulator and when an excess frequency modulation level is sensed the common output is switched to the frequency discriminator. The output of the amplitude demodulator is followed by an inverter which operates under control of a polarity integrator to reverse the AM-demodulation product depending on the magnitude of the FM- demodulation product, in the sense to give AM-demodulation of correct polarity.
279691
Gammel Josef
Kammerlander Karl
Neyen,hans-Jurgen von Der
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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