US3596255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display blanking apparatus
Assignee: HP Inc
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Filing: 1969-07-09
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Granted: 1971-07-27
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Expires: 1989-07-09
Abstract
Abstract The frequency of an unknown signal is displayed as the arithmetic combination of counts taken during a gate period of clock pulses and of pulses of the unknown frequency. The arithmetic combination of the counts typically provides a display quantity to a number of significant digits that exceeds the accuracy with which the counts are taken. Logic circuitry detects and blanks the significant display digits to the right of a decimal point which exceed the basic accuracy of the measurements.
Inventors
- 👤 Gilbert A Reeser
- 👤 Gary B Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:29
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/60; G06F7/62; G06F5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
222 words
Digit display apparatus for blanking selected less significant zero and nonzero display digits, the apparatus comprising: processing means for processing a pair of digital data signals to produce an output digit signal as the algebraic combination of digital data signals introduced therein; circuit means for introducing first and second digital data signals representing plural numbers of data digits into said processing means for processing therein to produce an output digit signal; display means for producing an output indication of a multidigit number; display control means having a control input and being coupled to said processing means to receive the output digit signal therefrom for actuating the display means to produce an output indication representative of said output digit signal which includes a number of digits selected by signal applied to said control input; and auxiliary means responsive to the number of data digits represented by at least one of a pair of digital data signals applied to the processing means for applying to the control input of the display control means a control signal which is representative of said number of data digits for actuating the display means to produce an output indication only of a selected number which is less than all of the digits represented by the output digit signal and which is related to said number of data digits.
Claim 2
Dependent Claim
222 words
Digit display apparatus for blanking selected less significant zero and nonzero display digits, the apparatus comprising: processing means for processing a pair of digital data signals to produce an output digit signal as the algebraic combination of digital data signals introduced therein; circuit means for introducing first and second digital data signals representing plural numbers of data digits into said processing means for processing therein to produce an output digit signal; display means for producing an output indication of a multidigit number; display control means having a control input and being coupled to said processing means to receive the output digit signal therefrom for actuating the display means to produce an output indication representative of said output digit signal which includes a number of digits selected by signal applied to said control input; and auxiliary means responsive to the number of data digits represented by at least one of a pair of digital data signals applied to the processing means for applying to the control input of the display control means a control signal which is representative of said number of data digits for actuating the display means to produce an output indication only of a selected number which is less than all of the digits represented by the output digit signal and which is related to said number of data digits.
Claim 3
Dependent Claim
167 words
Digit display apparatUs as in claim 1 wherein: said circuit means includes first and second counters for counting the number of pulses applied thereto to produce said digital data signals which are indications of the number of pulses counted by said counters; gate means are adapted to receive pulses from pulse sources and are coupled to said first and second counters for applying received pulses to said counters for a selected pulse counting intervals; and said auxiliary means are responsive to the number of digits in the number count of pulses taken by one of said counters during a selected pulse counting interval for applying to the control input of said display control means a control signal which is representative of said number of digits in said number count for actuating the display means to produce an output indication only of a selected number of the digits represented by said output digit signal which is related to said number of digits in said number count of pulses.
Claim 4
Dependent Claim
185 words
Digit display apparatus as in claim 2 wherein: one of said pulse sources is a source of reference pulses which recur at a standard frequency; the other of said pulse sources is a source of pulses, the recurrence period or repetition frequency of which is to be measured; said selected pulse counting interval is the interval between a selected number of recurrences of the pulses to be measured; the first counter is coupled through said gate means to receive said references pulses; said first counter counts the reference pulses during said selected pulse counting period with a selected number value of count resolution; and said auxiliary means responds to this number of digits in said first counter and to the number of digits in the number value of the count resolution of said first counter to produce said control signal for actuating said display means to produce an output indication representative of said output digit signal and including a number of digits equal to the algebraic combination of the number of digits in said number counter and the number of digits in said number value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |