Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1977-05-20
1978-05-23
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
307293, 325145, 331111, 331177R, 332 4, 332 26, 333 29, H03C 310
Patent
active
040913422
ABSTRACT:
A time delay modulator is disclosed in which the instantaneous time base of a carrier signal is varied in accordance with a modulating signal. In one embodiment, modulation is achieved through the use of charge transfer delay lines and variable frequency clocks in which a carrier wave signal is applied to the input of the delay line and the carrier wave signal is propagated through the delay line at a rate determined by the output frequency of an oscillator which deviates from a nominal frequency by an amount proportionate to the magnitude of the modulating signal. In another embodiment, an analog-to-digital converter, a shift register and a digital-to-analog converter in serial configuration are each controlled by a voltage controlled oscillator. The carrier wave signal is connected to the input of the analog-to-digital converter and samples are taken in accordance with a clock input. Parallel digital output signals are applied to an N x M bit shift register, the output of which is applied to the digital-to-analog converter having a serial output. A modulating signal is applied to the voltage controlled oscillator which provides an output deviating from a nominal frequency by an amount proportional to the magnitude of the modulating signal.
REFERENCES:
patent: 2923891 (1960-02-01), Nicholson, Jr.
patent: 3444396 (1969-05-01), Fox
patent: 3546490 (1970-12-01), Sangster
patent: 3559103 (1965-10-01), Cooper
patent: 3947874 (1976-03-01), Lentz
patent: 3959597 (1976-05-01), Keiser
Davies et al., Electronics Letters, 24 Jan. 1974, vol. 10, No. 2, pp. 21, 22.
Cohen Joseph T.
General Electric Company
Grimm Siegfried H.
Snyder Marvin
Squillaro Jerome C.
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