Computer graphics processing and selective visual display system – Image superposition by optical means
Patent
1990-05-15
1992-07-07
Safourek, Benedict V.
Computer graphics processing and selective visual display system
Image superposition by optical means
340511, 340514, 371 205, 375 10, H04B 346, H04B 1700
Patent
active
051289628
ABSTRACT:
A line interface circuit sends two-level signals to a line and receives two-level signals from a line. The two levels of the signals are on opposite sides of a threshold range of levels. For testing the circuit the transmitter is connected to the receiver by a switchable path, and a test signal is produced by the transmitter for reception by the receiver for monitoring the functioning of the circuit. The test signal is of a small amplitude so as not to enter the threshold range of levels). The connections of the transmitter and receiver to the line are maintained during testing. During testing the output of the transmitter is limited in amplitude by a voltage clamp so that it can produce only the test signal.
REFERENCES:
patent: 4393508 (1983-07-01), Boudault
patent: 4993045 (1991-02-01), Alfauso
Fattori Frank R.
Kerslake Richard M.
Bocure Tesfaldet
Donaldson Richard L.
Hiller William E.
Safourek Benedict V.
Texas Instruments Incorporated
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