Pulse or digital communications – Repeaters – Testing
Patent
1992-02-07
1994-07-05
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
332170, H03C 152, H04L 2704
Patent
active
053274628
ABSTRACT:
In this invention, in order to generate a VSB modulation signal from a digital baseband signal, an in-phase component of a modulation signal having a frequency spectrum having a high-frequency component whose level is half that of its low-frequency component, and an orthogonal component of the modulation signal of a high-frequency component having a frequency spectrum whose level is half that of the low-frequency component are generated from the baseband signal. The in-phase component and the orthogonal component are multiplied with carrier signals to obtain a carrier in-phase component and a carrier orthogonal component. The carrier in-phase component and the carrier orthogonal component are synthesized to obtain a VSB modulation signal.
REFERENCES:
patent: 3559070 (1971-01-01), Sharpe
patent: 4974236 (1990-11-01), Gurcan et al.
IEEE Transactions on Communications, vol. 23, No. 3, Mar. 1975, pp. 352-361, F. S. Hill, Jr., "Optimum Pulse Shapes for Pulse-Amplitude Modulation Data Transmission Using Vestigial Sideband Modulation".
Proceedings of the National Electronics Conference, vol. 18, 1962, pp. 51-58, F. F. Kuo, et al., "Hilbert Transforms and Modulation Theory".
Proceedings of the I.R.E., vol. 27, No. 11, Nov. 1939, pp. 687-690, N. Koomans, "Asymmetric-Sideband Broadcasting".
Aoki Toshio
Hamada Masatoshi
Hashimoto Yasuhiro
Ishikawa Tatsuya
Kawai Nobuhiko
Bocure Tesfaldet
Chin Stephen
Kabushiki Kaisha Toshiba
Nippon Hoso Kyokai
LandOfFree
Digital type VSB modulation apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital type VSB modulation apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital type VSB modulation apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-802317