GB1326562A - Digital transmission systems - Google Patents
Digital transmission systemsInfo
- Publication number
- GB1326562A GB1326562A GB1326562DA GB1326562A GB 1326562 A GB1326562 A GB 1326562A GB 1326562D A GB1326562D A GB 1326562DA GB 1326562 A GB1326562 A GB 1326562A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bit
- group
- significant
- digits
- check
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
- H04L1/0063—Single parity check
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/007—Unequal error protection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Error Detection And Correction (AREA)
Abstract
1326562 Digital transmission systems GENERAL ELECTRIC CO Ltd 19 April 1971 [5 March 1970] 10669/70 Heading H4P In a digital system where infrequently occurring errors in less significant digits are acceptable, an error check is made on the more significant digits, and any group of digits found to be in error is replaced by the previous (stored) group. The system may be used for television signals which are converted into nine bit groups, the digits being of reducing significance i.e. the first bit being the most significant and the ninth the least. A parity bit may be added to the first four bits but parity addition to the less significant five bits is not carried out. Ten digit groups are transmitted and stored on receipt and a check is made on the four more significant bits plus parity bit and if a check reveals no errors the original nine bit group less parity bit is passed to a decoder. If the check reveals an error the previous nine bit group is utilized in place of the present group.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1066970 | 1971-04-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1326562A true GB1326562A (en) | 1973-08-15 |
Family
ID=9972099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1326562D Expired GB1326562A (en) | 1971-04-19 | 1971-04-19 | Digital transmission systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1326562A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2430140A1 (en) * | 1978-06-30 | 1980-01-25 | Philips Nv | RECEIVER FOR DIGITAL SIGNALS IN LINE CODE |
| EP0422802A1 (en) * | 1989-10-12 | 1991-04-17 | Stc Plc | Speech codec arrangement |
-
1971
- 1971-04-19 GB GB1326562D patent/GB1326562A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2430140A1 (en) * | 1978-06-30 | 1980-01-25 | Philips Nv | RECEIVER FOR DIGITAL SIGNALS IN LINE CODE |
| EP0422802A1 (en) * | 1989-10-12 | 1991-04-17 | Stc Plc | Speech codec arrangement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |