US4571735A
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Method of multi-level encoding including synchronizing signals
Assignee: Individual
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Filing: 1982-10-08
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Granted: 1986-02-18
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Expires: 2002-10-08
Abstract
Abstract A method and apparatus for transmitting binary sequential data by the multi-level encoding of grouped selected data bits are disclosed. A first number of data bit sequences of the grouped data bits are translated into uniquely chosen ones of a first group of differing level pairs of a multi-level signal and the remaining data bit sequences of the grouped data bits are translated, in a first mode of translation, into uniquely chosen ones of a second group of differing level pairs of the signal, and, in a second mode of translation, into uniquely chosen ones of a third group of differing level pairs of the signal, the mode of translation changing after the occurrence of any of the remaining data bit sequences. The transmission of the signal level pairs representing data is preceded by the transmission of a start synchronizing signal comprising first pair of levels of the signal not contained in the first, second or third groups and is followed by a second pair of levels of the signal not contained in the first, second or third groups.
Inventors
- 👤 Anthony G. Furse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/50; H04B10/501; H04B10/503; H04B10/505; H04B10/5055; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4923; H04L25/4925; H04L7/00; H04L7/04; H04L7/06; H04L7/041; H04L7/046
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
179 words
A method for transmitting binary sequential data by multi-level encoding of grouped selected data bits in which a first number of data bit sequences of said grouped data bits are translated into uniquely chosen ones of a first group of level pairs of a multi-level signal and the remaining data bit sequences of said grouped data bits are translated, in a first mode of translation, into uniquely chosen ones of a second group of level pairs of said signal, and, in a second mode of translation, into uniquely chosen ones of a third group of level pairs of said signal, the mode of translation changing after the occurrence of any of one said remaining data bit sequences, characterized by the steps of: (a) transmitting a start synchronizing signal comprising a first pair of levels of said signal not contained in said first, second or third groups; (b) transmitting signal level pairs representative of data; and (c) transmitting an end synchronizing signal comprising a second pair of levels of said signal not contained in said first, second or third groups.
Claim 2
Independent Claim
179 words
A method for transmitting binary sequential data by multi-level encoding of grouped selected data bits in which a first number of data bit sequences of said grouped data bits are translated into uniquely chosen ones of a first group of level pairs of a multi-level signal and the remaining data bit sequences of said grouped data bits are translated, in a first mode of translation, into uniquely chosen ones of a second group of level pairs of said signal, and, in a second mode of translation, into uniquely chosen ones of a third group of level pairs of said signal, the mode of translation changing after the occurrence of any of one said remaining data bit sequences, characterized by the steps of: (a) transmitting a start synchronizing signal comprising a first pair of levels of said signal not contained in said first, second or third groups; (b) transmitting signal level pairs representative of data; and (c) transmitting an end synchronizing signal comprising a second pair of levels of said signal not contained in said first, second or third groups.
Claim 3
Dependent Claim
27 words
A method according to claim 1 further characterized in that the synchronizing signal pairs are chosen from those which do not involve a change of signal level.
Claim 4
Dependent Claim
29 words
A method according to claim 1 further characterized in that a chosen one of said remaining data bit sequence is transmitted continuously during periods where no data is present.
Claim 5
Independent Claim
163 words
A method for transmitting binary sequential data by paired selected ternary encoding in which two of the possible four bit sequences of paired binary data are translated into uniquely chosen ones of two of the six possible successive differing level pairs of a ternary signal and the other two of the possible four bit sequences of the paired data are translated, in a first mode of transulation, into respective uniquely chosen ones of a further two successive differing level pairs of said ternary signal, and, in a second mode of translation, respectively into the remaining two successive differing level pairs of said ternary signal, the mode of translation changing after an occurrence of either of the said other two bit sequences, characterized by the steps of: (a) transmitting two bits comprising successive identical first levels of said ternary signal; (b) transmitting said ternary signal representing a unit of data; and (c) transmitting two bits comprising successive identical second levels of said ternary signal.
Claim 6
Independent Claim
163 words
A method for transmitting binary sequential data by paired selected ternary encoding in which two of the possible four bit sequences of paired binary data are translated into uniquely chosen ones of two of the six possible successive differing level pairs of a ternary signal and the other two of the possible four bit sequences of the paired data are translated, in a first mode of transulation, into respective uniquely chosen ones of a further two successive differing level pairs of said ternary signal, and, in a second mode of translation, respectively into the remaining two successive differing level pairs of said ternary signal, the mode of translation changing after an occurrence of either of the said other two bit sequences, characterized by the steps of: (a) transmitting two bits comprising successive identical first levels of said ternary signal; (b) transmitting said ternary signal representing a unit of data; and (c) transmitting two bits comprising successive identical second levels of said ternary signal.
Claim 7
Dependent Claim
29 words
A method according to claim 4 in which a ternary signal corresponding to one of said other two bit sequences is transmitted during periods where no data is transmitted.
Claim 8
Dependent Claim
199 words
Apparatus for transmitting binary sequential data by multi-level encoding of grouped selected data bits, comprising means by which a first number of data bit sequences of said grouped data bits are translated into uniquely chosen ones of a first group of level pairs of a multi-level signal and the remaining data bit sequence of said grouped data bits are translated, in a first mode of translation, into uniquely chosen ones of a second group of level pairs of said signal, and, in a second mode of translation, respectively into uniquely chosen ones of a third group of level pairs of said signal; and means for changing the mode of translation from said first mode to said second mode after the occurrence of any one of said remaining data bit sequences, said apparatus further comprising means by which the transmission of signal level pairs representing data is preceded by the transmission of a start synchronizing signal comprising a first pair of levels of said signal not contained in said first, second or third groups and is followed by an end synchronizing signal comprising a second pair of levels of said signal not contained in said first, second or third groups.
Claim 9
Dependent Claim
199 words
Apparatus for transmitting binary sequential data by multi-level encoding of grouped selected data bits, comprising means by which a first number of data bit sequences of said grouped data bits are translated into uniquely chosen ones of a first group of level pairs of a multi-level signal and the remaining data bit sequence of said grouped data bits are translated, in a first mode of translation, into uniquely chosen ones of a second group of level pairs of said signal, and, in a second mode of translation, respectively into uniquely chosen ones of a third group of level pairs of said signal; and means for changing the mode of translation from said first mode to said second mode after the occurrence of any one of said remaining data bit sequences, said apparatus further comprising means by which the transmission of signal level pairs representing data is preceded by the transmission of a start synchronizing signal comprising a first pair of levels of said signal not contained in said first, second or third groups and is followed by an end synchronizing signal comprising a second pair of levels of said signal not contained in said first, second or third groups.
Claim 10
Dependent Claim
34 words
Apparatus fpr transmitting binary sequential data according to claim 6, further comprising means for the continuous transmission of a chosen one of said remaining data bit sequences during periods where no data is present.
Claim 11
Dependent Claim
186 words
Apparatus for transmitting binary sequential data by paired selected ternary encoding, comprising encoding means for translating two of the possible four bit sequences of paried binary data into uniquely chosen ones of two of six possible successive differing level pairs of a ternary signal and for translating the other two of the possible four bit sequences of the paired data, in a first mode of translation, into respective uniquely chosen ones of a further two successive differing level paris of said ternary signal, and, in a second mode of translation, respectively into the remaining two successive differing level pairs of said ternary signal, and means for providing an input to said encoding means after an occurrence of either of said other two bit sequences for changing the mode of translation of said encoding means, said apparatus further comprising means by which the transmission of said ternary signal representing a unit of data is preceded by the transmission of two bits comprising successive identical first levels of said ternary signal and followed by the transmission of two bits comprising successive identical second levels of said ternary signal.
Claim 12
Dependent Claim
186 words
Apparatus for transmitting binary sequential data by paired selected ternary encoding, comprising encoding means for translating two of the possible four bit sequences of paried binary data into uniquely chosen ones of two of six possible successive differing level pairs of a ternary signal and for translating the other two of the possible four bit sequences of the paired data, in a first mode of translation, into respective uniquely chosen ones of a further two successive differing level paris of said ternary signal, and, in a second mode of translation, respectively into the remaining two successive differing level pairs of said ternary signal, and means for providing an input to said encoding means after an occurrence of either of said other two bit sequences for changing the mode of translation of said encoding means, said apparatus further comprising means by which the transmission of said ternary signal representing a unit of data is preceded by the transmission of two bits comprising successive identical first levels of said ternary signal and followed by the transmission of two bits comprising successive identical second levels of said ternary signal.
Claim 13
Dependent Claim
34 words
Apparatus for transmitting binary sequential data according to claim 8, further comprising means for transmitting, during periods when no data is transmitted, a ternary signal corresponding to one of said other two bit sequences.
Claim 14
Dependent Claim
98 words
Apparatus according to claim 8 or claim 9 further characterized in that said encoding means comprises digital multiplexer means for encoding said binary data to provide a first driving signal and a second driving signal; output means capable of occupying one of three states each corresponding to a level of said ternary signal, the state of said output means being controlled by a first output driving circuit and a second output driving circuit, said first driving signal being applied to said first output driving circuit and said second driving signal being applied to said second output driving circuit.
Claim 15
Dependent Claim
69 words
Apparatus according to claim 10 further characterized in that said output means is driven to a first state when each of said driving signals is in a first state and to a second state when each of said driving signals is in a second state and to a third state when one of said driving signals is in its first state and the other is in its second state.
Claim 16
Dependent Claim
28 words
Apparatus according to claim 11 wherein said output means comprises a pair of semiconductor devices the respective states of which are controlled in response to said driving signals.
Claim 17
Dependent Claim
18 words
Apparatus according to claim 12 wherein said output means comprises a load impedence common to said semiconductor devices.
Claim 18
Dependent Claim
42 words
Apparatus according to claim 13 wherein each said semiconductor device is a transistor being one of a pair of differentially connected transistors, the conductive states of each said pair being controlled by flip-flops actuated by said first and second driving signals, respectively.
Claim 19
Dependent Claim
37 words
Apparatus according to claim 10 further characterized in that said encoding means comprises register means providing two signals respectively containing alternate data bits of said binary data, said two signals being applied to said digital multiplexer means.
Claim 20
Dependent Claim
79 words
Apparatus according to claim 10 further characterized in that said first and second driving circuits comprise start synchronizing means responsive to a signal indicating a commencement of data transmission to cause said output means to occupy its state corresponding to said first level of said ternary signal, and end synchronizing means responsive to a signal indicating the end of data transmission to cause said output means to occupy its state corresponding to said second level of said ternary signal.
Claim 21
Dependent Claim
109 words
Apparatus according to claim 14 wherein said first and second driving circuits further comprise a flip-flop arranged to over-ride the operation of said flip-flops actuated by said first and second driving signals in response to a signal indicating the commencement of data transmission to cause said output means to occupy its state corresponding to said first level of said ternary signal, and a flip-flop arranged to over-ride the operation of said flip-flops actuated by said first and second driving signals in response to a signal indicating the end of data transmission to cause said output means to occupy its state corresponding to said second level of said ternary signal.
Claim 22
Dependent Claim
51 words
Apparatus according to claim 10 further characterized in that said means for changing the mode of translation comprises gate means detecting the occurrence of either of said other two bit sequences, and means actuated by said gate to alter the logical state of selected controlling inputs of said digital multiplexer means.
Claim 23
Dependent Claim
51 words
Apparatus for receiving a multi-level signal of the type produced by the method of claim 1 or the apparatus of claim 6, comprising means for detecting said start synchronizing signal; means for decoding said signal level pairs representing data bits in said signal; and means for detecting said end synchronizing signal.
Claim 24
Dependent Claim
23 words
Apparatus according to claim 19 comprising a clock signal generator synchronized by means responsive to changes in the level of said ternary signal.
Claim 25
Dependent Claim
43 words
Apparatus for processing a ternary data signal of the type produced by apparatus according to claim 20 comprising means detecting a repetition of said one of said other two bit sequences and means generating an idle signal upon the detection of said repetition.
Claim 26
Dependent Claim
88 words
Apparatus for processing a ternary data signal of the type produced by the apparatus of claim 8, comprising means deriving from said ternary data signal a first signal representative of first and second levels of said ternary signal and a second signal representative of said second and third levels of said ternary signal, said first signal being applied to first shift register means, said second signal being applied to second shift register means, the outputs of said first and second shift register means being applied to decoding means.
Claim 27
Dependent Claim
19 words
Apparatus for processing a ternary data signal according to claim 20 wherein said decoding means includes digital multiplexing means.
Claim 28
Independent Claim
143 words
A method for transmitting binary sequential data by paired selected ternary encoding in which two of the possible four bit sequences of paired binary data are translated respectively into first and second level pairs of a ternary signal and the other two of the possible bit sequence of the paired data are translated, in a first mode of translation, respectively into third and fourth level pairs of said ternary signal and in a second mode of translation, respectively into fifth and sixth level pairs of said ternary signal, characterized by the steps of: (a) transmitting two bits comprising a seventh level pair of said ternary signal; (b) transmitting said ternary signal representing a unit of data after said seventh level pair; and (c) transmitting two bits comprising an eighth level pair of said ternary signal of following the transmission of said ternary signal.
Claim 29
Independent Claim
143 words
A method for transmitting binary sequential data by paired selected ternary encoding in which two of the possible four bit sequences of paired binary data are translated respectively into first and second level pairs of a ternary signal and the other two of the possible bit sequence of the paired data are translated, in a first mode of translation, respectively into third and fourth level pairs of said ternary signal and in a second mode of translation, respectively into fifth and sixth level pairs of said ternary signal, characterized by the steps of: (a) transmitting two bits comprising a seventh level pair of said ternary signal; (b) transmitting said ternary signal representing a unit of data after said seventh level pair; and (c) transmitting two bits comprising an eighth level pair of said ternary signal of following the transmission of said ternary signal.
Claim 30
Dependent Claim
157 words
Apparatus for transmiting binary sequential data by paired selected ternary encoding, comprising means for translating two of four possible bit sequences of paired binary data into first and second level pairs, respectively, of a ternary signal and for translating the other two of the possible bit sequences of the paired data, in a first mode of translation, respectively into third and fourth level pairs of said ternary signal and in a second mode of translation, respectively into fifth and sixth level pairs of said ternary signal, and means changing the mode of translation after an occurrence of either of the said other two bit sequences, characterized in that said apparatus further comprises means by which the ternary signal representing a unit of data is preceded by the transmission of two bits comprising a seventh level pair of said ternary signal and followed by the transmission of two bits comprising an eighth level pair of said ternary signal.
Claim 31
Dependent Claim
157 words
Apparatus for transmiting binary sequential data by paired selected ternary encoding, comprising means for translating two of four possible bit sequences of paired binary data into first and second level pairs, respectively, of a ternary signal and for translating the other two of the possible bit sequences of the paired data, in a first mode of translation, respectively into third and fourth level pairs of said ternary signal and in a second mode of translation, respectively into fifth and sixth level pairs of said ternary signal, and means changing the mode of translation after an occurrence of either of the said other two bit sequences, characterized in that said apparatus further comprises means by which the ternary signal representing a unit of data is preceded by the transmission of two bits comprising a seventh level pair of said ternary signal and followed by the transmission of two bits comprising an eighth level pair of said ternary signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |