US3755660A
Expired / Lapsed
US
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Digital word magnitude selection circuit apparatus
Assignee: Collins Radio Co
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Filing: 1972-02-11
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Granted: 1973-08-28
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Expires: 1992-02-11
Abstract
Abstract A circuit for selecting which one of a pair of binary digital serial word numbers are the least (or most) positive and providing an output indicative of this selected value. Two of these circuits may be used in series for providing an output which is always contained between two limits. The selection is accomplished by subtracting one of the digital numbers from the other and checking the answer. If the answer or difference is negative, the subtrahend is larger than the minuend. On the other hand, if the answer or difference is positive, the minuend is more positive than the subtrahend. A zero answer will indicate that both numbers are equal.
Inventors
- 👤 D Sather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/02; G06F7/026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
294 words
Apparatus of the class described comprising, in combination: first subtraction means including first and second input means and an output whereby a serial digital word signal supplied to said first input means is subtracted from a serial digital word signal supplied to said second input means and the difference is supplied as a serial digital word signal at the output; first supply means for supplying a serial digital word input signal to said first input means of said first subtraction means; second supply means supplying a serial digital word second signal to said second input means of said first subtraction means; sign detection means including input means and output means, an output signal being supplied in response to an input word of a given numerical polarity; first connection means connecting the output of said first subtraction means to the input of said detection means; first gating means including first, second, and third input means and output means, said first gating means providing a connection of said first input means thereof to said output means thereof when a signal is supplied to said second input means thereof of a first logic value and providing a connection of said third input means thereof to said output means thereof when said input signal supplied to said second input means thereof is of a second logic value; second connection means including shift register means connected between Said first input of said first subtraction means and said first input means of said first gating means; third connection means connecting said second input means of said first subtraction means to said third input of said gating means; and fourth connection means connecting said output means of said sign detection means to said second input means of said first gating means.
Claim 2
Dependent Claim
294 words
Apparatus of the class described comprising, in combination: first subtraction means including first and second input means and an output whereby a serial digital word signal supplied to said first input means is subtracted from a serial digital word signal supplied to said second input means and the difference is supplied as a serial digital word signal at the output; first supply means for supplying a serial digital word input signal to said first input means of said first subtraction means; second supply means supplying a serial digital word second signal to said second input means of said first subtraction means; sign detection means including input means and output means, an output signal being supplied in response to an input word of a given numerical polarity; first connection means connecting the output of said first subtraction means to the input of said detection means; first gating means including first, second, and third input means and output means, said first gating means providing a connection of said first input means thereof to said output means thereof when a signal is supplied to said second input means thereof of a first logic value and providing a connection of said third input means thereof to said output means thereof when said input signal supplied to said second input means thereof is of a second logic value; second connection means including shift register means connected between Said first input of said first subtraction means and said first input means of said first gating means; third connection means connecting said second input means of said first subtraction means to said third input of said gating means; and fourth connection means connecting said output means of said sign detection means to said second input means of said first gating means.
Claim 3
Dependent Claim
28 words
Apparatus as claimed in claim 1 wherein the output of said sign detection means is a logic 1 if the signal supplied thereto is a negative numerical value.
Claim 4
Dependent Claim
45 words
Apparatus as claimed in claim 2 wherein said third connection means also includes a shift register, said shift register having a binary capacity equivalent to the digital word length of the digital words supplied to said first and second input means of said subtraction means.
Claim 5
Dependent Claim
75 words
Apparatus as claimed in claim 2 wherein said sign detection means comprises three J-K flip-flops and wherein said gating means comprises at least three AND gates, the output signal from said gating means comprising a digital word, delayed one word time with respect to and equivalent to the least positive of the two digital word signals being supplied to said first and second inputs of said first subtraction means at a given word time period.
Claim 6
Dependent Claim
64 words
Apparatus comprising the apparatus of claim 1 and comprising in addition: further means comprising the apparatus of claim 1 and connected as recited in claim 1 and further having one of the inputs of said further means connected to the output of said first gating means, the output of said further means comprising the more positive of the input signals supplied to further means.
Claim 7
Dependent Claim
192 words
Apparatus for providing an output representative of the input word closest to an infinite numerical value, in a given polar direction, of two digital input words comprising, in combination: word detection means including first and second inputs and an output, said word detection means providing an output signal only when the numerical difference between digital input words supplied at the first and second inputs thereof results in a given numerical polarity digital word; means for supplying digital words to said first and second inputs of said word detection means; word storage means connected to said means for supplying said digital words to said first and second inputs for receiving words therefrom; and gating means connected to said word detection means and to said word storage means for providing an output, in response to output signals received from said word detection means indicative of the binary digital word received in a previous word time period which is the input word closest to an infinite numerical value in a given polar direction of the two digital words supplied to said word detection means as determined by the output signal from said word detection means.
Claim 8
Dependent Claim
192 words
Apparatus for providing an output representative of the input word closest to an infinite numerical value, in a given polar direction, of two digital input words comprising, in combination: word detection means including first and second inputs and an output, said word detection means providing an output signal only when the numerical difference between digital input words supplied at the first and second inputs thereof results in a given numerical polarity digital word; means for supplying digital words to said first and second inputs of said word detection means; word storage means connected to said means for supplying said digital words to said first and second inputs for receiving words therefrom; and gating means connected to said word detection means and to said word storage means for providing an output, in response to output signals received from said word detection means indicative of the binary digital word received in a previous word time period which is the input word closest to an infinite numerical value in a given polar direction of the two digital words supplied to said word detection means as determined by the output signal from said word detection means.
Claim 9
Dependent Claim
52 words
Apparatus as claimed in claim 6 wherein the output provided by said gating means of the apparatus is indicative of the least positive numerical value of two digital input words and the word detection means provides an output signal only when the difference between the two digital input words is numerically negative.
Claim 10
Dependent Claim
55 words
Apparatus as claimed in claim 6 wherein the output provided by said gating means of said apparatus is representative of the most positive of the two input digital words and the output of the word detection means is provided only when the difference between the two digital inputs results in a negative polarity digital word.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |