Modem designs, and systems using the modem designs for communica

Details Modem designs, and systems using the modem designs for communica Modem designs, and systems using the modem designs for communica

1999-10-06

2000-05-23

Ghebretinsae, Temesghen

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375330, 329304, H04L 2710, H04L 2718

Patent

active

060673257

ABSTRACT:
Various modem designs are described, along with systems that use the modem designs for communicating data between a large number of remote locations and one or more central locations preferably over CATV. One aspect features a modem having a transmitter which uses a state machine and digital waveform signals stored in a memory to create a modulated signal. Another aspect features a modem having a receiver which uses a digital correlator including an SRAM for detecting a bipolar phase shift keyed signal. Still another aspect features a modem comprising an oscillator circuit having a feedback loop, wherein the feedback loop utilizes a downlink signal, and a protection circuit which prevents a malfunction in the modem from causing system-wide shutdown.

REFERENCES:
patent: 4346472 (1982-08-01), Ohkoshi et al.
patent: 5247308 (1993-09-01), Koning
patent: 5377265 (1994-12-01), Wettengel et al.

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