Signal combining circuits

Details Signal combining circuits Signal combining circuits

1974-07-11

1976-03-02

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250204, 250209, 250237R, 307311, G01D 534

Patent

active

039420027

ABSTRACT:
A signal combining circuit includes means for receiving a pair of digital waveforms of similar frequency and for producing a further waveform which is indicative by its phase of the relative amplitudes of the waveforms. A circuit arrangement is provided for reducing undesirable distortions of the shape of the further waveform, however this arrangement introduces undesirable phase modifications and means are provided for reducing the effect of these modifications. The relative phases of the two digital waveforms are, at a predetermined frequency, switched to one or other of two predetermined relationships and the phase of the further waveform obtained when one of the relationships occurs is compared with that obtained when the other relationship occurs in order to compensate for said modifications.

REFERENCES:
patent: 3309525 (1967-03-01), Johnson
patent: 3381212 (1968-04-01), Peltola
patent: 3492488 (1970-01-01), Goettelman
patent: 3524986 (1970-08-01), Harnden
patent: 3622801 (1971-11-01), Stone
patent: 3783277 (1974-01-01), Younkin et al.

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