Electrical pulse counters – pulse dividers – or shift registers: c – Applications – Measuring or testing
Patent
1987-02-25
1988-08-09
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Applications
Measuring or testing
328111, 328119, 375116, H03K 519, H03K 908
Patent
active
047633417
ABSTRACT:
A digital timing generator using a state machine detects the presence of a predetermined pulse pattern at the input to generate a valid pulse output, and from the periodic repetition of the valid pulse output indicates the presence or absence of an input signal having the predetermined pulse pattern. The edges of the pulses at the input are detected and the pulse widths are determined by a time duration counter as being within the limits corresponding to the predetermined pulse pattern. A valid pulse counter is incremented for each pulse having the proper pulse width, and when the count of the counter reaches a predetermined value a valid pulse output is indicated. The valid pulse output may be delayed before being input to a signal presence detector. Each valid pulse output restarts a time interval counter and increments a valid input counter so long as the time interval timer does not reach a maximum time interval. When a predetermined minimum value of the valid input counter is reached, a valid input signal is indicated. Then the valid input counter counts the number of consecutive times that the maximum time interval is reached without the receipt of the valid pulse output, indicating the absence of the input signal when a predetermined maximum value is reached.
REFERENCES:
patent: 3686634 (1972-08-01), Malchman et al.
patent: 3894287 (1975-07-01), Mathiesen
patent: 4232267 (1980-11-01), Hanajima et al.
patent: 4651332 (1987-03-01), Brown
patent: 4683495 (1987-07-01), Brock
patent: 4692710 (1987-09-01), Shuartsman
Gray Francis I.
Heyman John S.
The Grass Valley Group Inc.
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