Scramble transmission apparatus and signal processing apparatus
US5515437A · kind A · utility
15Cited by
4References
46Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Aug 16, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1675
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The occurrence of malfunction on the reproduction side is avoided by preventing a scrambled signal from being coincided with a reserved word in the signal when a scramble process is carried out in order to release a transmission signal to specific users. The scramble process includes at least one of methods of (1) bit-inverting specified codes of the transmission signal code by code, (2) limiting bits to be scrambled from a specified position in the transmission signal, and (3) limiting codes to be scrambled to specific codes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.