Patent US3845290A successfully refreshed from Google Patents.
US3845290A
Expired / Lapsed
US
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Decimal-to-binary converter
Assignee: Digital Equipment Corp
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Filing: 1973-04-20
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Granted: 1974-10-29
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Expires: 1993-04-20
Abstract
Abstract A digital decimal number is converted into a binary number by starting from the most signigicant digit, successively adding the coded digits to the part of the number which has been coded and which is multiplied by 10. The multiplication by 10 is effected as an addition of 8x and 2x the already coded part of the number, the multiplications by 8 and 2 being realized as shift operations over three bits and one bit, respectively. The addition of the newly added digit is effected by coding it in the bit locations which are vacated by the shift operations, any remaining bit being translated into an input carry.
Inventors
- 👤 J Reitsma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:17
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/02; H03M7/06; H03M7/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
171 words
A device for recoding a number consisting of successive digits from a higher radix to a lower radix, comprising an output register in which, after the recoding of a series of high order digits of the number, the part of the number which is recoded according to the lower radix is stored, an adder in which at least an m-multiple and an n-multiple of the recoded part of the number are added, the sum of m and n being equal to the higher radix, m and n themselves being integer powers of the lower radix, and also comprising an add input on which a digit of next lower significance of the number to be recoded is received, an auxiliary coding unit being provided in which the digit of next lower significance is recoded into at least two parts which are coded according to the lower radix and which have maximum values of m-1 and n-1, respectively, said parts being applied, together with the said m-multiple and n-multiple, respectively, to the adder.
Claim 2
Independent Claim
171 words
A device for recoding a number consisting of successive digits from a higher radix to a lower radix, comprising an output register in which, after the recoding of a series of high order digits of the number, the part of the number which is recoded according to the lower radix is stored, an adder in which at least an m-multiple and an n-multiple of the recoded part of the number are added, the sum of m and n being equal to the higher radix, m and n themselves being integer powers of the lower radix, and also comprising an add input on which a digit of next lower significance of the number to be recoded is received, an auxiliary coding unit being provided in which the digit of next lower significance is recoded into at least two parts which are coded according to the lower radix and which have maximum values of m-1 and n-1, respectively, said parts being applied, together with the said m-multiple and n-multiple, respectively, to the adder.
Claim 3
Dependent Claim
66 words
A device as claimed in claim 1, wherein the auxiliary coding unit comprises three outputs, on two of which the said parts having the maximum value m-1 and n-1, respectively, appear, and a third output on which a third part of the digit of next lower significance, having a maximum value 1, the said third output being connected to the lowest-order carry input of the adder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |