GB862281A - Parity bit generator - Google Patents
Parity bit generatorInfo
- Publication number
- GB862281A GB862281A GB33436/59A GB3343659A GB862281A GB 862281 A GB862281 A GB 862281A GB 33436/59 A GB33436/59 A GB 33436/59A GB 3343659 A GB3343659 A GB 3343659A GB 862281 A GB862281 A GB 862281A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- code
- parity
- odd
- parity bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Detection And Correction Of Errors (AREA)
Abstract
862,281. Digital electric calculating circuits. NATIONAL CASH REGISTER CO. Oct. 2, 1959 [Oct. 22, 1958], No. 33436/59. Class 106 (1). Signals corresponding to the binary representation of a number are applied to a parity bit generator comprising a number of comparator circuits arranged in tree formation so as to have an output according to whether the number is odd or even. The output can be used where necessary to provide a "parity bit," or in dealing with a full parity-bit code can be used to detect an error. Fig. 1 shows an example using PNP transistors for computing the parity bit to be added to a 7-bit code to ensure that the number of 1's in the code shall always be odd, the necessary output being then taken at 49 from inverter 48. Alternatively, if the code is to be even the output is taken at 47. The circuit is made up of a number of two-transistor comparators of the type described in Specification 844,966 in which like inputs produce a low-voltage output, whereas unlike inputs produce a highvoltage output. The circuit can be modified to have eight inputs when it acts as a check on the odd or even parity code, an error bringing up an alarm.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US862281XA | 1958-10-22 | 1958-10-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB862281A true GB862281A (en) | 1961-03-08 |
Family
ID=22197130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33436/59A Expired GB862281A (en) | 1958-10-22 | 1959-10-02 | Parity bit generator |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1105206B (en) |
| GB (1) | GB862281A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL279117A (en) * | 1961-05-31 | |||
| US3287546A (en) * | 1963-02-27 | 1966-11-22 | Ibm | Parity prediction apparatus for use with a binary adder |
-
1959
- 1959-10-02 GB GB33436/59A patent/GB862281A/en not_active Expired
- 1959-10-20 DE DEN17397A patent/DE1105206B/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1105206B (en) | 1961-04-20 |
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