SATELLITE SIGNAL TRANSMISSION SYSTEM

Japanese Patent JP3464653

B2

PROBLEM TO BE SOLVED: To reduce the number of frequency converters in a block converter used for a satellite signal transmission system.
SOLUTION: A converter 8 frequency-converts a satellite broadcast signal into a satellite broadcast intermediate frequency signal BS-IF. Converters 4V, 4H frequency-convert horizontally and vertically polarized wave satellite communication signals into first and second satellite communication intermediate frequency signals CS-IF1, CS-IF2, respectively. The frequency bands of the signals CS-IF1, CS-IF2 are partly overlapping but not overlapping with the frequency band of the signal BS-IF and the signals can be transmitted through a transmission path. The block converter 20 receives the signals CS-IF1, CS-IF2 and the signal BS-IF. The converter 20 is provided with a frequency converter that frequency-converts the signal CS-IF1 into a third satellite communication intermediate frequency signal by using a first local oscillation signal and with a second frequency converter that frequency-converts the third satellite communication intermediate frequency signal into a fourth satellite communication intermediate frequency signal by using a second local oscillation signal, and the block converter 20 outputs the fourth satellite communication intermediate frequency signal with the second satellite communication intermediate frequency signal.

Toru Uemura
Toshikazu Obara
Yasuhiro Fujii

JP2001029686A

November 10, 2003

April 13, 1999

Click for automatic bibliography generation  

dx antenna corporation

H04B1/18; H04B1/26; H04N5/44; (IPC1-7): H04B1/18; H04B1/26; H04N5/44

JP10233706A
JP4189036A
JP8107326A
JP42510Y2

Masatoshi Kimura

Previous Patent: エアーモータ用部材

Next Patent: GAME INFORMATION PROVIDING SYSTEM, TERMINAL DEVICE, GAME SYSTEM, PROGRAM AND INFORMATION STORAGE MED...