Pulse or digital communications – Repeaters – Testing
Patent
1992-02-21
1994-11-22
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375 76, 341 57, H04L 2534
Patent
active
053675355
ABSTRACT:
A circuit for developing a binary bitstream signal from a ternary analog signal having positive and negative amplitude peaks includes an analog-to-digital converter for receiving the analog signal and providing digital samples in accordance with the amplitude and polarity of the analog signal. The most significant bit of digital sample indicates the polarity of an analog signal sample. A threshold value is compared to a current amplitude sample to indicate a level change in the analog signal when the sample value exceeds the threshold value and the polarity differs from that of the preceding sample which exceeded the threshold value. The current sample value which exceeds the threshold value is compared with preceding sample values which exceeded the threshold value, and a level change is indicated by the sample value which most exceeds the threshold value. Incorrect sample values are inverted in a correction circuit.
REFERENCES:
patent: 4081756 (1978-03-01), Price et al.
patent: 4413347 (1983-11-01), Kobayashi
patent: 4504872 (1985-03-01), Petersen
patent: 4626933 (1980-12-01), Buoska et al.
patent: 4661801 (1987-04-01), Chen et al.
Chin Stephen
Deutsche Thomson-Brandt GmbH
Ghebretinsae T.
Herrman Eric P.
Kurdyla Ronald H.
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