Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1975-12-04
1979-11-27
Safourek, Benedict V.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 44, 325153, H04B 168
Patent
active
041763190
ABSTRACT:
An improved system and method for processing and amplifying double-sideband suppressed or reduced carrier waves using high efficiency amplifiers and not requiring frequency dividers. Typical practice of the invention involves generating a double-sideband suppressed carrier wave in a balanced modulator; for example, at a sub-harmonic carrier frequency and multiplying the frequency of the output of the balanced modulator by an odd multiplication factor greater than one in the modulated amplifier.
The required envelope modulation (amplitude modulation) component is derived from the original balanced modulator output by use of an envelope demodulator and the component is used to modulate the modulated stage so as to reproduce the double-sideband suppressed carrier wave at a high power level.
This invention may also be used in reduced carrier double-sideband transmitters; i.e., where the carrier is not fully suppressed but where the carrier is smaller in amplitude than the peak amplitude of the combined upper and lower sideband waves.
REFERENCES:
patent: 2784311 (1957-03-01), Kahn
patent: 3026489 (1962-03-01), Gold
Electronics, Feb. 5, 1960, pp. 47-49, "New Suppressed-Carrier Technique: Dysinger et al."
Radio Amateur's Handbook, 1972, pp. 222-223.
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