Method and device for comparing two variable analogue signals
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United States of America Patent
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Apr 19, 1994
Grant Date -
N/A
app pub date -
Sep 10, 1991
filing date -
Dec 1, 1989
priority date (Note) -
Expired
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Abstract
A device compares two variable analogue signals, e.g. varying in time, such as audio or video signals. The signals, which are either different or identical but shifted in time, are within a predetermined frequency range. The device includes two parallel channels for processing analogue signals. One of the channels introduces a time shift of one signal with respect to the other, the shift being equal to a 1/4 period at the center frequency of the band. Both channels include in series circuits for transforming the analogue signals into binary logic signals, a logic circuit, a summing circuit for establishing a first and second correlation signal. An adder adds the absolute values of the first and second correlation signals to form a third correlation signal that is substantially independent of any time shift between the analogue signals.
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