Method and apparatus for prescaler desynchronization

Details Method and apparatus for prescaler desynchronization Method and apparatus for prescaler desynchronization

1990-07-19

1992-06-16

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

307240, 364487, G01R 1320, H03K 1700

Patent

active

051227347

ABSTRACT:
A method and apparatus prevents unwanted synchronization from obstructing a data acquisition instrument operator's view of N multiplexed signals synchronized to a high speed system clock being used to trigger an instrument through a prescaler with a fixed prescaling factor M, where N and M are related by a common factor. During a time while the instrument, for example, an oscilloscope, is ignoring trigger input information, a desynchronizing signal is applied to the prescaler, causing it to miss a random number of counts or causing it to count incorrectly. Thus, when the oscilloscope resumes triggering it is likely to be synchronized to a different combination of the multiplexed signals. This technique can be applied to individual data points or to records containing a number of data points. By accumulating a number of records obtained in this way and superimposing them on the display, or by simply displaying them very rapidly so that the averaging effects of the human eye cause them to appear to be superimposed, these composite records effectively include complete information about the full set of multiplexed signals.

REFERENCES:
patent: 3456189 (1969-07-01), Hornak
patent: 3473123 (1969-10-01), Hornak
patent: 3713029 (1973-01-01), Uchida
patent: 4142146 (1979-02-01), Schumann et al.
patent: 4495586 (1985-01-01), Andrews
patent: 4621217 (1986-11-01), Saxe et al.
patent: 4890248 (1989-12-01), Reinhardt

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