Pulse or digital communications – Repeaters – Testing
Patent
1990-07-31
1992-03-17
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 94, 371 379, H03D 100, H04L 2506
Patent
active
050974866
ABSTRACT:
The decision feedback decoder of the invention receives sequentially sampled values of a signal waveform corresponding to data bits transmitted by a channel. A magnitude comparator compares the sampled values to a threshold and based on each comparison it provides subsequent decisions determining the values of the corresponding data bits. A predetermined number of previous decisions are stored and applied to a first and a second threshold adjustment circuit. Each circuit adjusts the threshold depending on the respective values of the previous decisions, while the first circuit provides the adjustment based on an assumption that the next decision to be made will have a first signal value and the second circuit provides the adjustment based on an assumption that the next decision will have a second signal value. When that next decision becomes available, it is utilized to select the correct adjusted threshold value for the next comparison by the magnitude comparator.
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Bower Dan E.
Newby Paul S.
Almeida George B.
Ampex Corporation
Safourek Benedict V.
Strnad Elizabeth E.
Tse Young
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