Circuit arrangement for comparing the synchronism or...

Details Circuit arrangement for comparing the synchronism or... Circuit arrangement for comparing the synchronism or...

H - Electricity

03

D

328/162

H03D 13/00 (2006.01) G01R 19/00 (2006.01) G01R 19/165 (2006.01)

Patent

CA 1129018

TITLE OF THE INVENTION: CIRCUIT ARRANGEMENT FOR COMPARING THE SYNCHRONISM OR TRACKING BETWEEN TWO ANALOG SIGNALS ABSTRACT OF THE DISCLOSURE: The synchronism or tracking between two analog signals is compared by a circuit arrangement having two inputs to which these analog signals are applied. A comparator cir- cuit compares the two signals and provides a trigger or energizing signal to a switch which in turn produces an error signal when the two compared signals deviate from each other to an extent larger than a predetermined limit. One input is connected to the comparator circuit through a heterodyning circuit wherein the respective analog signal is heterodyned by a heterodyning signal which varies in its polarity. The comparator circuit includes a polarity de- tector which provides a signal signifying a positive or a negative difference between the amplitudes of the two polarity signals. A discriminator circuit is operatively connected to the comparator to provide a switch energizing signal when the difference signal does not have any zero transitions or passages with the frequency of the hetero- dyning signal.

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