Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1994-06-15
1995-05-02
Chin, Stephen
Pulse or digital communications
Transmitters
Antinoise or distortion
H04L 2549
Patent
active
054126916
ABSTRACT:
A technique for compensating for frequency distortion in a band-limited communication channel, using a random-access memory (RAM) to store successive samples of a signal pulse, the samples having been precalculated to perform an equalization function prior to transmission of the pulse. The signal samples are retrieved, converted to analog form, and filtered to produce a precompensated analog pulse signal. In one embodiment of the invention, equalized profiles of a limited number of pulses of different shapes are stored in the RAM, and are retrieved as needed for transmittal through the band-limited channel. Thus the invention can perform its equalization function while facilitating encoding of the signal into a different form, such as modified duobinary code.
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Ginzburg Simon A.
Gustafson Roy W.
Newman David S.
Chin Stephen
Digital Equipment Corporation
Kozik Kenneth F.
Luther William A.
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