Multiplex communications – Wide area network – Packet switching
Patent
1994-04-06
1995-07-11
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 50, 370 953, 455 85, 455 86, H04B 150, H04B 7212
Patent
active
054327792
ABSTRACT:
A time division multiplex transmitting/receiving system converts a signal to be transmitted into a signal having a predetermined frequency in a predetermined time slot, which is transmitted as a transmission signal, and receives a transmitted signal having a frequency different from the frequency of the transmitted signal at another time slot different from the time slot of the predetermined frequency, and for demodulating this received signal. The time division multiplex transmitting/receiving system includes a fixed oscillator, a variable oscillator, a mixer, a modulator, a converter, a frequency divider, and a demodulator. The fixed oscillator outputs a first signal having a constant frequency. The variable oscillator outputs a second signal having a predetermined frequency within a predetermined band range. The mixer mixes the first signal with the second signal. The modulator directly modulates a signal to be transmitted by employing the mixed signal. The converter converts the received signal into the intermediate signal by employing the mixed signal. The frequency divider frequency-divides the first signal outputted from the fixed oscillator. The demodulator demodulates the intermediate frequency signal outputted from the converter with using the output from the frequency divider.
REFERENCES:
patent: 4525835 (1985-06-01), Vance et al.
patent: 5134615 (1992-07-01), Freeburg et al.
patent: 5307378 (1994-04-01), Norimatsu
Hiraiwa Hisaki
Sato Hideaki
Shimo Norio
Suzuki Sei
Safourek Benedict V.
Shaw Philip M.
Sony Corporation
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