Method and apparatus for encoding and decoding a bit sequence for transmission over POTS wiring
AssigneeTut Systems, Inc.
InventorsMartin H. Graham, Harold H. Webber, Jr.
Life of this patent
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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.
Claims17
A method of encoding a first bit sequence as a symbol for transmission over a carrier medium, the symbol having a time duration indicative of the first bit sequence and being determined by first and second delimiters, the method including the steps of:
- receiving the first bit sequence at an encoder;
- and
- identifying a first symbol, having a duration indicative of the bit sequence, from a predetermined group of symbols, wherein the first symbol comprises a first encoding portion and a buffer portion and wherein the buffer portion is of sufficient duration to allow reflections, generated by propagation of the first delimiter on the carrier medium, to decay to a predetermined level before propagation of the second delimiter.
An encoder arrangement for encoding a bit sequence as a symbol for transmission over a carrier medium, the symbol having a time duration indicative of the bit sequence and being defined by first and second delimiters, the encoder arrangement comprising:
- an input coupled to receive the bit sequence;
- a matching circuit that identifies the symbol, from a set of predetermined symbols, indicative of the bit sequence;
- and
- an output that transmits the first delimiter and the second delimiter defining the time duration of the symbol, wherein the symbol comprises an encoding portion and a buffer portion and wherein the buffer portion is of sufficient duration to allow reflections, generated by propagation of the first delimiter on the carrier medium, to decay to a predetermined level before propagation of the second delimiter.
A method of encoding a bit sequence as a symbol of transmission over a carrier medium, the symbol having a time duration indicative of the bit sequence and being determined by first and second delimiters, the method including the steps of:
- receiving the bit sequence at an encoder;
- identifying an encoding symbol portion having a duration indicative of the bit sequence;
- and
- appending the encoding symbol portion to a buffer symbol portion to construct a composite symbol, the buffer symbol portion having a duration sufficient to allow reflections, generated by propagation by the first delimiter on the carrier medium, to decay to a predetermined level before propagation of the second delimiter.
Dependencies are inferred from the claim text.