Time measuring method and time measuring system which enable to discriminate whether or not the measurement result is within the required measurement

U.S. Patent Number: 5872745

Abstract: In a time measuring system having a high-speed counter section (1) for counting up a counter value in response to a clock signal between supplies of a measurement start signal and a measurement stop signal to produce a counter output signal representative of the counter value, a signal producing section (4) is supplied with a measurement able/disable switching signal and with an original stop signal and produces the measurement start signal and the measurement stop signal. An adding section (2) executes an adding operation as regards the counter value by the use of the clock signal and the counter output signal to produce a sum total of the counter value. Responsive to the sum total, a data producing section (3) produces a resolution datum by the use of the counter output signal. In order to produce the measurement start signal and the measurement stop signal, the signal producing section uses the resolution datum, the sum total, and the clock signal. The measurement start signal and the measurement stop signal are supplied from the signal producing section to the high-speed counter.

Inventors: Murakami; Hirokuni (Kanagawa, JP)

Assignee: NEC Corporation (Tokyo, JP)

Application Number: 09/100,816

Issued: 1999-02-16

Expired: 2007-02-16

Classes: 368/113

Field of search: 368/113-120 364/569 377/20

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