Circuit and method for the recorder display of high frequency pe

Details Circuit and method for the recorder display of high frequency pe Circuit and method for the recorder display of high frequency pe

1979-02-26

1980-07-15

Miller, Jr., George H.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 33R, 307353, 328151, 364483, G01D 900, H03K 500, H03K 1700, G01D 410

Patent

active

042131340

ABSTRACT:
A circuit and method for the display of a high frequency periodic signal on a display (21) having a maximum response frequency less than the periodic signal frequency includes a signal period counter (12) for counting the number of periods in the high frequency periodic signal, a sampling control counter (16) for counting at a frequency substantially greater than the frequency of the high frequency periodic signal, and a comparator (17) for comparing the counts in the signal period counter (12) and the sampling control counter (16) and indicating a match thereof. When a match count is indicated, some electrical parameter of the high frequency periodic signal is sampled and held by a sample and hold circuit (20) until the next match count is indicated, thereby accurately reproducing the high frequency periodic signal at another frequency in a range of frequencies from zero up to and including the maximum response frequencies of the display.

REFERENCES:
patent: 3594589 (1971-07-01), Hall
patent: 3753133 (1973-08-01), Shumate, Jr.
patent: 3795008 (1974-02-01), Kolsrud et al.
patent: 3936740 (1976-02-01), Hogg et al.
patent: 3955102 (1976-05-01), Chi
patent: 4019146 (1977-04-01), Lesche
patent: 4069447 (1978-01-01), Frye
patent: 4073009 (1978-02-01), Andow et al.
patent: 4090144 (1978-05-01), Jenik et al.
patent: 4112296 (1978-09-01), Heimbigner et al.

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