초록 ▼

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. Eit

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. 2N different levels of the modulated carrier signal can be used to represent the state of N digital bits.

대표청구항 ▼

A method of modulating a carrier signal, comprising the steps of: (a) changing the slope of the first occurring one of the upper and lower portions of a first transition of said carrier signal to a first value in response to an input signal; and (b) changing the slope of the second occurring one of

A method of modulating a carrier signal, comprising the steps of: (a) changing the slope of the first occurring one of the upper and lower portions of a first transition of said carrier signal to a first value in response to an input signal; and (b) changing the slope of the second occurring one of said upper and lower portions to a second value in response to said input signal, such that the ratio of one of said first and second values to the sum of said first and second values is representative of an input level of said input signal.