Pulse or digital communications – Repeaters – Testing
Patent
1997-03-18
2000-03-14
Pham, Chi H.
Pulse or digital communications
Repeaters
Testing
H04B 1500, H04K 100, H04L 2730
Patent
active
06038249&
ABSTRACT:
Transmission method and apparatus allow two channel simultaneous transmission of information codes having a transmission rate of 1.5 Mbps necessary for the transmission of motion pictures or semi-motion pictures through a 2.4 GHz small power communication band (ISM band). Carrier frequencies f.sub.fa and f.sub.hb of the two channels are set to different values from each other, QPSK modulation is demodulated in a receiver and then inverse-spread of the spectrum spread is conducted, and a low pass filter having a root roll-off characteristic is inserted to a succeeding stage of a spectrum spread circuit of a transmitter and a preceding stage of the spectrum inverse-spread circuit of the receiver.
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Corrielus Jean B
Hitachi Denshi Kabushiki Kaisha
Pham Chi H.
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