Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation
Patent
1990-03-26
1993-03-09
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Frequency or phase modulation
4551781, 455340, 333175, H04B 500, H04B 116
Patent
active
051932130
ABSTRACT:
An FM subcarrier receiver of the type useful for detection of a relatively high frequency subcarrier signal transmitted on an FM carrier which includes baseband and relatively high frequency signals is disclosed. It comprises radio frequency circuitry for providing a radio frequency signal having frequency modulated baseband and subcarrier components. High pass filter circuitry receives the output of the radio frequency circuitry. A tuned circuit receives the output of the high pass filter. It comprises a first inductor and a first capacitor tuned substantially to the frequency of the subcarrier which one wishes to detect. A second tuned circuit is tuned to the subcarrier which one wishes to detect. The second tuned circuit comprises a second inductor and a second capacitor. The first and second inductors comprise ferrite cores and are positioned with respect to each other to allow magnetic coupling therebetween. A subcarrier demodulator coupled to the second inductor and the second capacitors provides an audio signal corresponding to the information carried by the subcarrier.
REFERENCES:
patent: 3883809 (1975-05-01), Ver Planck et al.
patent: 4894629 (1990-01-01), Okamura et al.
Eisenzopf Reinhard J.
Faile Andrew
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