Accession Number : ADD015578

Title :   Uninterrupted, Enhanced-Rate, Event-Time Recorder with Mixed-Speed Counter Modules.

Descriptive Note : Patent, Filed 9 Oct 91, patented 25 Aug 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Cronyn, Willard M

Report Date : 25 Aug 1992

Pagination or Media Count : 15

Abstract : An uninterrupted event-time recorder enables high-precision measurements of the time-of-occurrence of randomly- and rapidly-occurring, digitally specified events such as the leading and/or trailing edges of asynchronous pulses. The lowest order binary digits of the recorder are constructed of high-speed synchronous integrated circuit counter devices. For an N-bit timer having M low-order bits, the highest order (N-M) bit counting is executed by two parallel (N-M)-bit slow-speed counters, one of which is incremented by the terminal count of the M-bit high-speed counter and the other which is incremented by the most significant bit (MSb) of the M-bit counter. The (N-M)-bit counters are read out through a multiplexer controlled by the MSb.

Descriptors :   *PULSE COUNTERS, *PATENTS, CIRCUITS, COUNTERS, EDGES, INTEGRATED CIRCUITS, MEASUREMENT, PULSES, RECORDING SYSTEMS, TERMINALS, TIME, TRAILING EDGES, VELOCITY, SYNCHRONISM, REAL TIME, ASYNCHRONOUS COMPUTERS, SCHEMATIC DIAGRAMS, LEADING EDGES

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE