US3747067A
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Method and apparatus for data transmission
Assignee: AMERICAN MULTIPLES SYST Inc
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Filing: 1971-08-30
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Granted: 1973-07-17
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Expires: 1991-08-30
Abstract
Abstract Method and apparatus for multiplex data transmission wherein binary control messages and a corresponding clock signal are transmitted from a central station through two transformer circuits to a plurality of remote terminals for control and monitoring of parameter points. A binary response message is transmitted from a remote terminal through a third transformer circuit back to the central station where a preset synchronous decoder converts the message from biphase waveform to non-returnto-zero waveform, and also generates a corresponding clock signal. A preset pattern recognition circuit assures word synchronization and a filter eliminates noise interference in the binary messages. Audio intercommunication simultaneous with the binary message transmission is provided through the transformer circuits.
Inventors
- 👤 T Klaus
- 👤 D Fox
- 👤 R Ichinose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:54
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4904; H04L5/00; H04L5/20; H04Q; H04Q9/00; H04Q9/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
168 words
A method of digital data transmission between a central station and a plurality of remote terminals including the steps of: generating at the central station a binary control message, including an initial pattern recognition frame to achieve word synchronization at the remote terminals and an address frame identifying the intended destination of the binary control message; encoding the binary control message into a biphase waveform and transmitting it to each of the remote terminals through a first transmission line; receiving and processing the encoded control message at the remote terminals including decoding the control message and recognizing the word synchronization pattern; generating at the addressed remote terminal a binary response message, including an initial pattern recognition frame to achieve word synchroniztion at the central station; encoding the response message into a biphase waveform and transmitting it to the central station through a second transmission line; and receiving and processing the encoded response message at the central station including decoding the response message and recognizing the word synchronization pattern.
Claim 2
Independent Claim
168 words
A method of digital data transmission between a central station and a plurality of remote terminals including the steps of: generating at the central station a binary control message, including an initial pattern recognition frame to achieve word synchronization at the remote terminals and an address frame identifying the intended destination of the binary control message; encoding the binary control message into a biphase waveform and transmitting it to each of the remote terminals through a first transmission line; receiving and processing the encoded control message at the remote terminals including decoding the control message and recognizing the word synchronization pattern; generating at the addressed remote terminal a binary response message, including an initial pattern recognition frame to achieve word synchroniztion at the central station; encoding the response message into a biphase waveform and transmitting it to the central station through a second transmission line; and receiving and processing the encoded response message at the central station including decoding the response message and recognizing the word synchronization pattern.
Claim 3
Dependent Claim
94 words
The method of claim 1 including the steps of: generating, encoding and transmitting a random sequence of control messages to the remote terminals; generating, encoding and transmitting a sequence of corresponding response messages to the central station; and wherein said transmitting of said random sequence of control messages includes time-sharing said first transmission line, and said transmitting of said sequence of corresponding response messages includes time-sharing said second transmission line, each successive control message being initiated after the response message for the previous control message has been received and processed by the central station.
Claim 4
Dependent Claim
52 words
The method of claim 2 includng presetting a digital logic circuit for recognizing the word synchronization pattern at the central station and remote terminals, said presetting being accomplished at the addressed remote terminal before said receiving of the control message, and at the central statioN before said receiving of the response message.
Claim 5
Dependent Claim
48 words
Themethod of claim 1 including transmitting audio communications between the central station and the remote terminals through said first and second transmission lines simultaneous with said transmitting of the control message through said first transmission line and said transmitting of the response message through the second transmission line.
Claim 6
Dependent Claim
30 words
The method of claim 1 wherein said generating step at the addressed remote terminal includes generating a binary response message having a data frame with both discrete and analog data.
Claim 7
Dependent Claim
31 words
The method of claim 1 wherein said generating steps include generating control and response messages in non-return-to-zero waveform and said decoding steps include decoding control and response messages into non-return-to-zero waveform.
Claim 8
Independent Claim
295 words
A method of transmitting a sequence of binary coded information between a central station and a plurality of remote terminals, including the steps of: generating a binary message in non-return-to-zero waveform addressed to a particular remote terminal; converting the binary message into a bipolar biphase waveform; transmitting the converted binary message by differential mode through a first transmission line from the central station to the remote terminals; processing the binary message at the addressed remote terminal and generating a binary response in non-return-t-zero waveform; converting the binary response into a bipolar biphase waveform; transmitting the converted binary response by differential mode through a second transmission line from the addressed remote terminal to the central station; processing the binary response at the central station; wherein word synchronization at the central station and the remote terminals is achieved by recognizing an initial frame pattern in the binary message and response, and bit synchronization for the binary message is achieved at the remote terminals by transmitting a clock signal from the central station through a third transmission line to the remote terminals and at the central station for the binary response by generating a clock signal from thebinary response itself; and further including the steps of: generating, converting and transmitting a random sequence of binary messages and associated binary response between the central station and the remote terminals, including time-sharing said first and second transmission lines, each successive binary message being initiated after the binary response to the previous binary message has been received and processed by the central station; and intercommunicating between the central station and the remote terminals by transmitting audio messages in common mode trough two of the transmission lines without interfering with said transmitting of binary messages and responses occurring concurrently with said intercommunicating.
Claim 9
Independent Claim
295 words
A method of transmitting a sequence of binary coded information between a central station and a plurality of remote terminals, including the steps of: generating a binary message in non-return-to-zero waveform addressed to a particular remote terminal; converting the binary message into a bipolar biphase waveform; transmitting the converted binary message by differential mode through a first transmission line from the central station to the remote terminals; processing the binary message at the addressed remote terminal and generating a binary response in non-return-t-zero waveform; converting the binary response into a bipolar biphase waveform; transmitting the converted binary response by differential mode through a second transmission line from the addressed remote terminal to the central station; processing the binary response at the central station; wherein word synchronization at the central station and the remote terminals is achieved by recognizing an initial frame pattern in the binary message and response, and bit synchronization for the binary message is achieved at the remote terminals by transmitting a clock signal from the central station through a third transmission line to the remote terminals and at the central station for the binary response by generating a clock signal from thebinary response itself; and further including the steps of: generating, converting and transmitting a random sequence of binary messages and associated binary response between the central station and the remote terminals, including time-sharing said first and second transmission lines, each successive binary message being initiated after the binary response to the previous binary message has been received and processed by the central station; and intercommunicating between the central station and the remote terminals by transmitting audio messages in common mode trough two of the transmission lines without interfering with said transmitting of binary messages and responses occurring concurrently with said intercommunicating.
Claim 10
Dependent Claim
169 words
Apparatus for multiplex data transmission of binary messages between a central station and a plurality of remote terminals, including in combination: means in said central station for generating binary control messages addressed to specific remote terminals; first transformer circuit means connecting said central station to each of said remote terminals for converting said binary control messages into bipolar biphase baseband signals and for transmitting said baseband signals in differential mode to said remote terminals; means in said remote terminals connected to said first transformer circuit means for receiving and processing said binary control messages and for generating binary response messages, said binary response messages being generated in each instance by the specific remote terminal to which the individual binary control message is addressed; and second transformer circuit means connecting said remote terminals to said central station for converting said binary response messages into bipolar biphase baseband signals and for transmitting said baseband Signals in differential mode to said central station for processing before another binary control message is generated.
Claim 11
Dependent Claim
169 words
Apparatus for multiplex data transmission of binary messages between a central station and a plurality of remote terminals, including in combination: means in said central station for generating binary control messages addressed to specific remote terminals; first transformer circuit means connecting said central station to each of said remote terminals for converting said binary control messages into bipolar biphase baseband signals and for transmitting said baseband signals in differential mode to said remote terminals; means in said remote terminals connected to said first transformer circuit means for receiving and processing said binary control messages and for generating binary response messages, said binary response messages being generated in each instance by the specific remote terminal to which the individual binary control message is addressed; and second transformer circuit means connecting said remote terminals to said central station for converting said binary response messages into bipolar biphase baseband signals and for transmitting said baseband Signals in differential mode to said central station for processing before another binary control message is generated.
Claim 12
Dependent Claim
61 words
The apparatus of claim 8 including : means in said central station for generating a clock signal corresponding to said binary control message; and third transformer circuit means connecting said central station to each of said remote terminals for converting said clock signal into a bipolar baseband signal and for transmitting said baseband signal in differential mode to said remote terminals.
Claim 13
Dependent Claim
71 words
The apparatus of claim 8 which includes means for audio communication between said central station and said remote terminals including audio circuit means connecting said central station and individual remote terminals to opposite ends of said first and second transformer circuit means for transmitting audio communications in common mode on said first and second transformer circuit means without interfering with their concurrent transmission of bipolar biphase baseband signals in differential mode.
Claim 14
Dependent Claim
74 words
The apparatus of claim 8 which includes first synchronous digital logic circuit means at said central station connected to said second transformer circuit means and at each of said remote terminals connected to said first transformer circuit means for recognizing a predetermined pattern in the initial frame of said binary control and response messages to achieve word synchronization at said central station and said remote terminals before processing said binary control and response messages.
Claim 15
Dependent Claim
43 words
The apparatus of claim 8 which includes second synchronous digital logic circuit means at said central station connected to said second transformer circuit means for decoding said binary response message from biphase waveform to non-return-to-zero waveform and for generating a corresponding clock signal.
Claim 16
Dependent Claim
54 words
The apparatus of claim 8 which includes circuit means at said remote terminals for filtering undesirable noise from the incoming control messages including a pair of logic gates connected in series with said first transformer circuit means with a smaller and a larger capacitor side-coupled, respectively, to each of said pair of logic gates.
Claim 17
Dependent Claim
347 words
Apparatus for multiplex data transmission of binary messages between a central station and a plurality of remote terminals, including in combination: means in said central station for generating binary control messages addressed to specific remote terminals; first transformer circuit means connecting said central station to each of said remote terminals for converting said binary control messages into bipolar biphase baseband signals and for transmitting said base-band signals in differential mode to said remote terminals; means in said remote terminals connected to said first transformer circuit means for receiving and processing said binary control messages, including logic gate means for filtering noise and removing ambiguous fluctuations from said binary control messages and including a pattern recognition circuit means for achieving word synchronization, and for generating binary response messages, said binary response messages being generated in each instance by the specific remote terminal to which the individual binary control message is addressed; second transformer circuit means connecting said remote terminals to said central station for converting said binary response messages into bipolar biphase baseband signals and for transmitting said baseband signals in differential mode to said central station; means in said central station for generating a clock signal corresponding to said binary control messages; third transformer circuit means connecting said central station to each of said remote terminals for converting said clock signal into a bipolar baseband signal and for transmitting said baseband signal in differential mode to said remote terminals; and audio circuit means connecting said central station and individual remote terminals to two of saiD transformer circuit means for transmitting audio communications in common mode between said central station and said remote terminals on said two transformer circuit means without interfering with the concurrent transmission of bipolar biphase baseband signals in differential mode; and wherein said central station includes synchronous digital logic circuit means connected to said second transformer circuit means for decoding said binary response messages from biphase waveform to non-return-to-zero waveform and for generating a corresponding clock signal to enable said central station to process each binary response message before generating another binary control message.
Claim 18
Dependent Claim
347 words
Apparatus for multiplex data transmission of binary messages between a central station and a plurality of remote terminals, including in combination: means in said central station for generating binary control messages addressed to specific remote terminals; first transformer circuit means connecting said central station to each of said remote terminals for converting said binary control messages into bipolar biphase baseband signals and for transmitting said base-band signals in differential mode to said remote terminals; means in said remote terminals connected to said first transformer circuit means for receiving and processing said binary control messages, including logic gate means for filtering noise and removing ambiguous fluctuations from said binary control messages and including a pattern recognition circuit means for achieving word synchronization, and for generating binary response messages, said binary response messages being generated in each instance by the specific remote terminal to which the individual binary control message is addressed; second transformer circuit means connecting said remote terminals to said central station for converting said binary response messages into bipolar biphase baseband signals and for transmitting said baseband signals in differential mode to said central station; means in said central station for generating a clock signal corresponding to said binary control messages; third transformer circuit means connecting said central station to each of said remote terminals for converting said clock signal into a bipolar baseband signal and for transmitting said baseband signal in differential mode to said remote terminals; and audio circuit means connecting said central station and individual remote terminals to two of saiD transformer circuit means for transmitting audio communications in common mode between said central station and said remote terminals on said two transformer circuit means without interfering with the concurrent transmission of bipolar biphase baseband signals in differential mode; and wherein said central station includes synchronous digital logic circuit means connected to said second transformer circuit means for decoding said binary response messages from biphase waveform to non-return-to-zero waveform and for generating a corresponding clock signal to enable said central station to process each binary response message before generating another binary control message.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |