Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1984-09-24
1986-01-14
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
329126, 329135, 332 23R, 375 42, H03C 500, H03D 500
Patent
active
045648239
ABSTRACT:
A modulation system wherein a carrier signal is modulated by an input signal having a variable amplitude, either analog or digital. The amplitude of the input signal is sampled every predetermined fractional cycle of the modulated signal; and the carrier signal is modulated in response to the sampled amplitude of the input signal to provide a modulated signal of which each predetermined fractional cycle has an amplitude and a duration that are inversely proportional to each other and related to the sampled amplitude of the input signal. The modulated signal is demodulated by either or both of the techniques of zero-crossing detection and peak-amplitude detection. The system is self-clocking, without discontinuous phase or amplitude changes and without DC components being introduced. The system transmits its own signal-recovering clock information and thereby permits modulation at a rate in excess of the carrier signal frequency.
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Grimm Siegfried H.
Robot Research, Inc.
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