Burst signal transmission system
First Claim
1. In a method of communication of the type comprising the steps of encoding an input digital signal given in a burst mode, representing information and having a plurality of bits including a first bit and succeeding bits each representing either a logical "0" or a logical "1", said input digital signal being encoded into a multi-level signal having a plurality of multi-level symbols including first symbol and succeeding symbols, said plurality of symbols including first polarity symbols, second polarity symbols and zero level symbols, transmitting said multi-level signal and, at a receiving end, decoding said encoded signal to obtain said information, the improvement characterized in that said encoding step comprises:
- successively generating said plurality of symbols corresponding to said plurality of bits, including generating a first polarity symbol as said first symbol if said first bit represents a logical "1" and generating a second polarity symbol as said first symbol if said first bit represents a logical "0", each non-zero generated succeeding symbol having a polarity opposite the polarity of the average DC level of prior generated symbols, unless said average DC level is substantially zero in which case the polarity of a non-zero generated symbol is opposite the polarity of the most recent preceding non-zero generated symbol.
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Accused Products
Abstract
In a multi-level transmission system, a binary digital signal is converted into a multi-level signal by generating successive multi-level symbols each having a polarity opposite the polarity of the average DC level of preceding symbols, with the first symbol having a first polarity when the first binary bit is a logical "0" and having a second polarity when the first bit is a logical "1". If desired, the logical values of all bits after the first bit can be complemented prior to generating the appropriate multi-level symbols.
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Citations
17 Claims
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1. In a method of communication of the type comprising the steps of encoding an input digital signal given in a burst mode, representing information and having a plurality of bits including a first bit and succeeding bits each representing either a logical "0" or a logical "1", said input digital signal being encoded into a multi-level signal having a plurality of multi-level symbols including first symbol and succeeding symbols, said plurality of symbols including first polarity symbols, second polarity symbols and zero level symbols, transmitting said multi-level signal and, at a receiving end, decoding said encoded signal to obtain said information, the improvement characterized in that said encoding step comprises:
successively generating said plurality of symbols corresponding to said plurality of bits, including generating a first polarity symbol as said first symbol if said first bit represents a logical "1" and generating a second polarity symbol as said first symbol if said first bit represents a logical "0", each non-zero generated succeeding symbol having a polarity opposite the polarity of the average DC level of prior generated symbols, unless said average DC level is substantially zero in which case the polarity of a non-zero generated symbol is opposite the polarity of the most recent preceding non-zero generated symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. In a communications system of the type including encoding means at a transmitter for encoding an input digital signal, said input digital signal representing information and having a plurality of bits including a first bit and succeeding bits each representing either a logical "0" or a logical "1", said input digital signal being encoded into a multi-level signal having a plurality of multi-level symbols including a first symbol and succeeding symbols, said plurality of symbols including first polarity symbols, second polarity symbols and zero level symbols, transmitting means for transmitting said multi-level signal and, at a receiver, decoding means for decoding said encoded signal to obtain said information, the improvement characterized in that said encoding means comprises:
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a first bit detector for detecting whether the first bit of said first input digital signal represents a logical "0" or a logical "1"; and generating means for successively generating said plurality of symbols corresponding to said plurality of bits, with each generated succeeding non-zero symbol having a polarity opposite the polarity of the average DC level of prior generated symbols, unless said average DC level is substantially zero in which case the polarity of a non-zero generated symbol is opposite the most recent preceding non-zero generated symbol, said generating means, in response to the detection by said first bit detector, generating a first polarity symbol as said first symbol if said first bit represents a logical "1" and generating a second polarity symbol as said first symbol if said first bit represents a logical "0". - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification