Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1976-08-16
1978-06-06
Griffin, Robert L.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325446, 325461, 332 1, H03C 150
Patent
active
040939197
ABSTRACT:
A carrier converter comprises a branching filter for dividing an FM signal into a pair of component signals having amplitudes varying in relation to the FM signal frequency in different frequency ranges. A directional coupler is coupled to a pair of variable impedance circuits. Supplied with the component signals together with a carrier signal, the variable impedance circuits produce, through the coupler, an AM signal of the carrier signal modulated substantially by a modulating signal for the FM signal. When a carrier converter comprises a balanced diode bridge as a variable impedance circuit, an input AM signal may be supplied directly to one pair of the bridge terminals with a carrier signal supplied to the other bridge terminal pair through a balanced-unbalanced converter, through which the bridge produces an output AM signal of the supplied carrier signal modulated substantially by a modulating signal for the input AM signal.
REFERENCES:
patent: 2528187 (1950-10-01), Sziklai et al.
patent: 3348168 (1967-10-01), Melchior et al.
patent: 3983487 (1976-09-01), Ohno
patent: 4001729 (1977-01-01), Weinberger
Bookbinder Marc E.
Griffin Robert L.
Nippon Electric Co. Ltd.
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