Pulse or digital communications – Repeaters – Testing
Patent
1984-03-16
1986-09-23
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375121, 332 9R, 329104, H03K 700, H03K 900
Patent
active
046139745
ABSTRACT:
A system and method for modulating a carrier signal wherein occurrence of the peaks in the modulated carrier signal conveys clocking information and each transition of a modulated carrier signal includes two midrange characteristics, the ratio of which represents data carried by that transition. Either analog or digital circuit techniques can be utilized to produce the modulated carrier signal, and either analog or digital techniques can be used to demodulate the modulated carrier signal in various embodiments of the invention. In an analog version of the modulator, a sinusoidal carrier signal is squared, alternate cycles of the squared waveform are phase shifted and clocked into analog multipliers, the gains of which are varied in response to an input data signal, the total gains being equal to a constant, and the multiplier outputs are summed to produce the modulated carrier signal. The ratios of the slopes of each transition represent the data. In an analog demodulator, the modulated signal is differentiated to obtain the slopes of the two portions of each transition and the peak values of the derivative signals are sampled, stored, and ratioed by means of an analog divider. 2.sup.N different levels of the modulated carrier signal can be used to represent the state of N digital bits.
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Electronic Engineering, Mar. 1967, pp. 174-176, "Combination Leading and Trailing Edge Variable Slope Pulse Modulation".
Gerdes Richard C.
Vokac Peter R.
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