Digital broadcasting apparatus

Details Digital broadcasting apparatus Digital broadcasting apparatus

2005-12-06

2005-12-06

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C370S210000, C386S349000

Reexamination Certificate

active

06973118

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.

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Journal of the Institute of Image Information and Television Engineers, Nov. 20, 1998, vol. 52, No. 11, pp. 1562-1566, “Chijyou Digital Housou no Kaihatsu Doukou 4-1 Densou Houshiki”.
Proceedings of Giken public lecture and research presentation, (Japan), May 22, 1998 p. 67-72, “Chijyou Digital Hoso no Denso Houshiki ˜ Kotei Jyushin oyobi Idou Jyushin ni okeru Densou Tokusei”, p. 69, line 14 to p. 70, line 29.

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