Digital broadcasting apparatus
US6973118B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 25, 2000 |
| Grant date | Dec 6, 2005 |
| Priority date | — |
| Expiry date | Feb 25, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70706
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A frequency interleaving circuit frequency-interleaves main signals generated according to sound data by parameters set according to frequencies of transmission channels. A sub-signal generating circuit generates sub-signals for transmission control including pilot signals. Mapping circuits modulate the sub-signals by using pseudo-random sequences generated based on initial values of random codes set according to frequencies of transmission channels. The frequency-interleaved main signals and the sub-signals modulated by the mapping circuits are OFDM-modulated. Then, they are converted to the frequencies of the transmission channels. An increase of a dynamic range of transmission signals can be suppressed by controlling the initial values of random codes set.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.