Method and apparatus for encoding and decoding a bit sequence fo

Details Method and apparatus for encoding and decoding a bit sequence fo Method and apparatus for encoding and decoding a bit sequence fo

1997-09-08

1999-10-05

Pham, Chi H.

Pulse or digital communications

Pulse width modulation

375239, 375295, 332109, 332112, H03K 708

Patent

active

059635959

ABSTRACT:
A method and apparatus for encoding a bit sequence as a symbol, suitable for transmission over POTS wiring, are described. The symbol has a duration indicative of the bit sequence, this time duration be determined by first and second delimiters. The method commences upon the receipt of a bit sequence at an encoder. Thereafter, a symbol, having a duration indicative of the bit sequence, is identified. The symbol is characterized in that it includes a buffer portion and an encoding portion. The buffer portion is of sufficient duration to allow reflections, generated by propagation of the first delimiter of the symbol on the POTS wiring, to decay to a predetermined level before propagation of the second delimiter.

REFERENCES:
patent: 4706246 (1987-11-01), Kume
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patent: 5151698 (1992-09-01), Pophillat
patent: 5515035 (1996-05-01), Gut
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patent: 5587692 (1996-12-01), Graham et al.
patent: 5614901 (1997-03-01), Haas
patent: 5696790 (1997-12-01), Graham et al.

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