Uninterrupted, Enhanced-Rate, Event-Time Recorder with Mixed-Speed Counter Modules.
Patent, Filed 9 Oct 91, patented 25 Aug 92,
DEPARTMENT OF THE NAVY WASHINGTON DC
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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 andor 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.
- Electrical and Electronic Equipment