Correlation time-difference detector
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorMinoru Oda
Life of this patent
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Abstract
A detecting instrument for detecting time difference between input times of two signals through the use of correlation function is disclosed. The instrument includes a digital circuit for repetitive computing of the correlation function between the two input signals and an analog circuit for detecting the phase of the fundamental frequency component of the repeated correlation function provided by the digital circuit.
Claims6
A correlation time-difference detector including a correlation function computing element operated periodically for obtaining the correlation function between two analog input signals and further including a peak position element for providing a peak position of the obtained correlation function by computation, wherein said peak position computing element comprises an analog circuit including means for extracting a fundamental frequency component of the same frequency as the operating frequency of said correlation function computing element from the output of said correlation function computing element and means for detecting the phase of the extracted fundamental frequency component with reference to a start signal of each operating cycle of said correlation function computing element.
Dependencies are inferred from the claim text.