Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1978-10-25
1980-03-18
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
179 1GE, 307240, 307242, 329167, 332 9R, 332 40, H03C 106, H03D 104, H04H 500
Patent
active
041941616
ABSTRACT:
A switching modulator (FIG. 3) for generating an FM composite stereo signal is disclosed. The modulator includes a switching circuit (40) for time division multiplexing the stereophonically related input signals onto an output line. The operation of the switching circuit is controlled by bilevel switching control signals provided by a function generator (48). The function generator provides bilevel switching control signals which have been modified so that the output of the switching circuit inherently lacks the third harmonic component which would have been present had conventional squarewave switching control signals instead been used. A low-pass filter (56) eliminates other, higher harmonics. A switching demodulator (FIG. 9) is also disclosed. This demodulator demodulates an FM composite signal through use of the same modified switching signal as used in the modulator.
REFERENCES:
patent: 3631355 (1971-12-01), Vail
patent: 3662113 (1972-05-01), Von Recklinghausen
patent: 3902019 (1975-08-01), Bruene
patent: 3962551 (1976-06-01), Gay
Grimm Siegfried H.
Harris Corporation
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