US3889063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplexed digital data communication system
Assignee: PHONPLEX CORP
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Filing: 1973-09-24
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Granted: 1975-06-10
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Expires: 1993-09-24
Abstract
Abstract A multiplexed digital data communication system wherein analog signals received from a conventional telephone system having a plurality of channels are multiplexed at a high sampling rate and converted to a series of discrete digital signals in a series of time slots. The system includes data transmission means for substituting data signals for said discrete digital signals in periodically spaced time slots. The communication system would include a plurality of local stations coupled to a common transmission line to which the series of discrete digital signals is applied, each of the local stations being adapted to demultiplex and convert to analog signals the portion of said discrete digital signal intended for it, and to supply said analog signals to the user. Similarly, the local station can multiplex and digitize user initiated analog signals for application to the transmission line, while the central station has demultiplexing and digital to analog capabilities.
Inventors
- 👤 Martin J Slavin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:36
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/14; H04N7/141; H04N7/148; H04M; H04M11/00; H04M11/06; H04M11/068; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
226 words
A digital data communication system for connection between a user and a telephone system having a plurality of input channels comprising, central station means coupled to said telephone system for receiving analog signals therefrom and for applying analog signals thereto; a plurality of local station means each adapted to receive analog signals from said user and for supplying analog signals to said user; communication transmission means operatively coupling said plurality of local station means to said central station means, said central station means and said local station means both being adapted to coordinately digitize and multiplex the analog signals received thereby at a first sampling rate for producing a communication signal applied to said transmission means including a series of discrete digital signals in a series of time slots, both said central station means and said local station means being adapted to coordinately demultiplex and convert from digital to analog portions of said communication signal received thereby for applying selected analog signals to said telephone system input channels to said user respectively; and data transmission means for automatically substituting digital data signals for the discrete digital signals representative of said analog signals in periodically spaced selected ones of said time slots of said communication signal, said data transmission means causing said substitution to be made at a second rate substantially lower than said first sampling rate.
Claim 2
Dependent Claim
226 words
A digital data communication system for connection between a user and a telephone system having a plurality of input channels comprising, central station means coupled to said telephone system for receiving analog signals therefrom and for applying analog signals thereto; a plurality of local station means each adapted to receive analog signals from said user and for supplying analog signals to said user; communication transmission means operatively coupling said plurality of local station means to said central station means, said central station means and said local station means both being adapted to coordinately digitize and multiplex the analog signals received thereby at a first sampling rate for producing a communication signal applied to said transmission means including a series of discrete digital signals in a series of time slots, both said central station means and said local station means being adapted to coordinately demultiplex and convert from digital to analog portions of said communication signal received thereby for applying selected analog signals to said telephone system input channels to said user respectively; and data transmission means for automatically substituting digital data signals for the discrete digital signals representative of said analog signals in periodically spaced selected ones of said time slots of said communication signal, said data transmission means causing said substitution to be made at a second rate substantially lower than said first sampling rate.
Claim 3
Dependent Claim
86 words
A digital data communication system as recited in claim 1, including a television receiver located at at least some oF said local stations; said central station including means for frequency division multiplexing said communication signal and a television signal for applying both said communication signal and said television signal to said transmission line, at least the local stations having said television receivers located thereat including filter means for selectively receiving said television signal for application to said television receiver and said communication signal for operation thereon.
Claim 4
Dependent Claim
89 words
A digital data communication system as recited in claim 1, including an audio signal receiver located at at least a portion of said local stations; said central station including frequency division multiplexing means for simultaneously applying an audio signal from other than said telephone system and said communication signal to said transmission line, at least said local stations having said audio signal receiver located thereat including filter means for selectively applying said audio signal to said audio receivers and said communication signal for operation thereon by said local station.
Claim 5
Dependent Claim
67 words
A digital data communication system as recited in claim 1, wherein said data transmission means includes teletypewriter receiver and transmission means positioned at at least one of said local station means, and formatting means in said local station means coupled to said teletypewriter means for receiving a digital teletypewriter signal therefrom, and for substituting said teletypewriter signal for said discrete digital signals in periodically spaced time slots.
Claim 6
Dependent Claim
53 words
A digital data communication system as recited in claim 1, wherein said data transmission means includes utilization circuit means and status means coupled to said utilization circuit means for producing a status data signal representative of the status of said utilization circuit means for application to said communication signal on said transmission line.
Claim 7
Dependent Claim
34 words
A digital data communication system as recited in claim 5, wherein said utilization circuit means is disposable in at least two states by a user for the selective production of said status data signal.
Claim 8
Dependent Claim
37 words
A digital data communication system as recited in claim 5, wherein said utilization circuit is an alarm sensor means, said status data signal being representative of the detection of an alarm indication by said alarm sensor means.
Claim 9
Dependent Claim
75 words
A digital data communication system as recited in claim 1, wherein said data transmission means includes control means for transmitting a control data signal for insertion in said communication signal, at least one of said local stations including an adjustable utilization circuit means and a utilization circuit control means, said utilization circuit control means being responsive to the detection of said control data signal for the adjusting of said utilization circuit means in response thereto.
Claim 10
Dependent Claim
58 words
A digital data communication system as recited in claim 1, wherein said communication signal includes a plurality of multiplexed system channels of communication, said local station means including address storage means and means for comparing addresses in said communication signal with said stored address for identifying system channels intended for each respective local station means for operation thereon.
Claim 11
Dependent Claim
56 words
A digital data communication system as recited in claim 9, wherein said local station means includes means for detecting the availability of a system channel, and means for applying said address to said communication signal in response to the detection of the availability of a system channel in said communication signal and actuation by the user.
Claim 12
Dependent Claim
124 words
A digital data communication system as recited in claim 9, wherrein said data transmission means includes a teletypewriter receiver and transmission means positioned at at least one of said local station means, said local station means including means for detecting the availability of a system channel and formatting means coupled to said teletypewriter means for receiving the digital teletypewriter signal therefrom, and for substituting said teletypewriter signal for said discrete digital signals in periodically spaced time slots when said local station is communicating along a system channel, and for applying said address and said teletypewriter signal to an available system channel in said communication signal identified by said system channel detection means when said local station means is not communicating along a system channel.
Claim 13
Dependent Claim
137 words
A digital data communication system as recited in claim 9, wherein said data transmission means includes utilization cirrcuit means and status means coupled to said utilization circuit means for producing a status data signal representative of the status of said utilization circuit means, said local station means including means for detecting the availability of a system channel and formatting means coupled to said status means for receiving a digital status data signal therefrom, and for substituting said digital status data signal for the discrete digital signals in periodically spaced time slots when said local station means is communicating along a system channel, and for applying said address and said digital status data signal along an available system channel detected by said system channel detecting means when said local station means is not communicating along a system channel.
Claim 14
Dependent Claim
34 words
A digital data communication system as recited in claim 12, wherein said utilization circuit means is disposable in at least two states by a user for the selective production of said status data signal.
Claim 15
Dependent Claim
37 words
A digital data communication system as recited in claim 12, wherein said utilization circuit is an alarm sensor means, said status data signal being representative of the detection of an alarm indication by said alarm sensor means.
Claim 16
Dependent Claim
38 words
A digital data communication system as recited in claim 1, including a plurality of transmission lines coupled to said central station means, a plurality of said local station means being operatively coupled to each of said transmission lines.
Claim 17
Dependent Claim
35 words
A digital data communication system as recited in claim 1, including repeater means coupled to said transmission line intermediate said local station means and said central station means for resynchronizing and amplifying said communication signal.
Claim 18
Dependent Claim
162 words
A digital data communication system as recited in claim 1, wherein said central station means includes data transfer buss means; sample and hold means coupled to each input channel of said telephone system; sequencing means for governing the operation of said sample and hold means for controlling the sequence of multiplexing and de-multiplexing; an analog to digital converter means coupled to all of said sample and hold means for converting the sampled analog signals from the respective input channels of said telephone system to digital form for application to said data transfer buss means; and digital to analog converter means for receiving digital signals from said data transfer buss and for applying a series of samples of analog signals to all of said sample and hold means, said sample and hold means associated with each of said input channels applying selected analog signal samples in periodically spaced time frames for application to the respective input channel in response to said sequencing means.
Claim 19
Dependent Claim
82 words
A digital data communication system as recited in claim 17, including a plurality of transmission lines coupled to said central station means, a plurality of said local station means being operatively coupled to each of said transmission lines, said central station means including means coupled to said sequencing means for control thereby interconnecting each of said transmission lines with said data transfer buss for applying the discrete digital signals in separate time frames associated with each transmission line to said transmission line.
Claim 20
Dependent Claim
59 words
A digital data communication system as recited in claim 1, wherein said communication signal includes a plurality of multiplexEd system channels, said central station means including attendant and monitoring control means for permitting manual assignment and monitoring of said system channels, and for receiving at least a portion of the digital data signals transmitted by said data transmission means.
Claim 21
Dependent Claim
80 words
A digital data communication system as recited in claim 1, wherein said local station means is releasably coupled to said transmission line for selective positioning at a plurality of locations therealong, said local station means including address storage means, means for comparing addresses on said communication signal with said stored address for identifying system channels intended for each respective local station means for operation thereon and means for applying said address to said communication signal upon actuation by said user.
Claim 22
Dependent Claim
61 words
A digital data communication system as recited in claim 1, wherein said communication signal includes a plurality of system channels, said central station means including control logic means for regulating the assignment of system channels between said input channels and said local station means in accordance with predetermined criteria, said control logic means being reprogrammable for selective changes in such criteria.
Claim 23
Dependent Claim
161 words
A digital data communication system, comprising at least two two-way communication stations; communication transmission means for operatively coupling said two-way communication stations; each of said two-way communication stations being adapted to receive and transmit analog signals, and being adapted to coordinately digitize and multiplex the analog signals received thereby at a first sampling rate for producing a communication signal applied to said transmission means including a series of discrete digital signals in a series of time slots, each of said two-way communication stations being further adapted to coordinately de-multiplex and convert from digital to analog portions of said communication signal received thereby for retransmitting said analog signals; and data transmission means for automatically substituting digital data signals for the discrete digital signals representative of said analog signals in periodically spaced selected ones of said time slots of said communication signal, said data transmission means causing said substitution to be made at a second rate substantially lower than said high sampling rate.
Claim 24
Dependent Claim
161 words
A digital data communication system, comprising at least two two-way communication stations; communication transmission means for operatively coupling said two-way communication stations; each of said two-way communication stations being adapted to receive and transmit analog signals, and being adapted to coordinately digitize and multiplex the analog signals received thereby at a first sampling rate for producing a communication signal applied to said transmission means including a series of discrete digital signals in a series of time slots, each of said two-way communication stations being further adapted to coordinately de-multiplex and convert from digital to analog portions of said communication signal received thereby for retransmitting said analog signals; and data transmission means for automatically substituting digital data signals for the discrete digital signals representative of said analog signals in periodically spaced selected ones of said time slots of said communication signal, said data transmission means causing said substitution to be made at a second rate substantially lower than said high sampling rate.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |