Aperture correction circuit

Details Aperture correction circuit Aperture correction circuit

1982-07-07

1984-11-06

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 514

Patent

active

044815379

ABSTRACT:
A delay circuit comprising a pair of modulators for executing biaxial quadrature modulation with carriers that have a 90.degree. phase difference therebetween, a mixer which mixes the modulated output signals of the modulators together to produce a composite output signal, delay circuitry for delaying the composite output signal of the signal mixer, and a pair of demodulators which are respectively associated with the pair of modulators and serve to demodulate the delayed output signal supplied by the delay circuitry. The first of the two demodulators associated with the first of the two modulators, produces a first demodulated output signal, a portion of which is supplied to the second of the two modulators as a modulating signal. Additionally, the first demodulated output signal is delayed by the delay circuitry for a predetermined duration with respect to an input signal fed to the first modulator. The second demodulator associated with the second modulator, produces a second demodulated output signal which is delayed for twice the predetermined duration of the first modulator input signal.

REFERENCES:
patent: 2929870 (1960-03-01), Gibson
patent: 3368030 (1968-02-01), Wiencek
patent: 3705952 (1972-12-01), Diehl

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