Patent US5319634A successfully refreshed from Google Patents.
US5319634A
Expired / Lapsed
US
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Multiple access telephone extension systems and methods
Assignee: Gula Consulting LLC
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Filing: 1991-10-07
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Granted: 1994-06-07
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Expires: 2011-10-07
Abstract
Abstract A method and system for conducting multiple access simultaneous telephone communications in full duplex either over the power lines of a building or using RF transmission. It employs a combination of multiple access techniques selected from among the following: time division, code division, and frequency division. The following features result: a) security coding to prevent unauthorized access and eavesdropping, b) multiple simultaneous conversations through identical and closely coupled transmission media, c) non-interference to other communications systems and users, and d) processing gain for operating in noisy environments.
Inventors
- 👤 David B. Bartholomew
- 👤 A. Ray Ivie
- 👤 Alma K. Schurig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
CPC Classifications
H; H04; H04J; H04J13/00; H04B; H04B3/00; H04B3/54; H04B3/542; H04M; H04M1/00; H04M1/71; H04M1/72; H04M1/725; H04M1/733; H04B2203/00; H04B2203/54; H04B2203/5404; H04B2203/5408; H04B2203/5425; H04B2203/5429; H04B2203/5437; H04B2203/5441; H04B2203/5445; H04B2203/545; H04B2203/5462; H04B2203/5483; H04B2203/5491
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
253 words
A telephone communications system, the system comprising: (a) a base unit comprising: (i) a first transmitter subsystem, (ii) a first receiver subsystem, and (iii) means for connecting said first transmitter subsystem and said first receiver subsystem to a telephone line; (b) an extension unit comprising: (i) a second transmitter subsystem, and (ii) a second receiver subsystem; each of said first and second transmitter subsystems comprising: (a) means or converting analog telephone communications signals to digital data signals; (b) means for generating a transmission carrier controlled by at least one multiple access means, said at least one multiple access means being selected form the group consisting of: (i) time division multiple access multiplexing means for controlling the times at which the digital data signals are transmitted; and (ii) frequency division multiple access means for changing said transmission carrier's frequency; (c) means for generating a pseudonoise code; (d) means for modulating said transmission carrier by said digital data signals and said pseudonoise code to produce a direct spread code division multiple access signal; and (e) means for coupling said direct spread code division multiple access signal to a communications medium; and each of said first and second receiver subsystems comprising: (a) means for receiving said direct spread code division multiple access signal from said communications medium; (b) means for recovering said modulated transmission carrier from said received direct spread code division multiple access signal; and (c) means for demodulating said recovered modulated transmission carrier to produce digital data corresponding to said analog telephone communications signals.
Claim 2
Dependent Claim
253 words
A telephone communications system, the system comprising: (a) a base unit comprising: (i) a first transmitter subsystem, (ii) a first receiver subsystem, and (iii) means for connecting said first transmitter subsystem and said first receiver subsystem to a telephone line; (b) an extension unit comprising: (i) a second transmitter subsystem, and (ii) a second receiver subsystem; each of said first and second transmitter subsystems comprising: (a) means or converting analog telephone communications signals to digital data signals; (b) means for generating a transmission carrier controlled by at least one multiple access means, said at least one multiple access means being selected form the group consisting of: (i) time division multiple access multiplexing means for controlling the times at which the digital data signals are transmitted; and (ii) frequency division multiple access means for changing said transmission carrier's frequency; (c) means for generating a pseudonoise code; (d) means for modulating said transmission carrier by said digital data signals and said pseudonoise code to produce a direct spread code division multiple access signal; and (e) means for coupling said direct spread code division multiple access signal to a communications medium; and each of said first and second receiver subsystems comprising: (a) means for receiving said direct spread code division multiple access signal from said communications medium; (b) means for recovering said modulated transmission carrier from said received direct spread code division multiple access signal; and (c) means for demodulating said recovered modulated transmission carrier to produce digital data corresponding to said analog telephone communications signals.
Claim 3
Dependent Claim
38 words
A telephone communications system as in claim 1 further comprising off hook circuitry for detecting off hook status in said extension unit and placing said telephone line connecting means of said base unit into an off hook condition.
Claim 4
Dependent Claim
57 words
A telephone communications system as in claim 1, said base unit further comprising ring detect circuitry for detecting ring signals on said telephone line and transmitting a ring command to said extension unit; and said extension unit further comprising ring generator circuitry for generating a ring signal in said extension unit upon receipt of said ring command.
Claim 5
Dependent Claim
29 words
A telephone communications system as in claim 1, wherein said means for coupling said direct spread code division multiple access signal to a communications medium comprises an RF antenna.
Claim 6
Dependent Claim
34 words
A telephone communications system as in claim 1, wherein said means for coupling said direct spread code division multiple access signal to a communications medium comprises a connection to power lines of a building.
Claim 7
Dependent Claim
16 words
A telephone communications system as in claim 1, further comprising one or more additional extension units.
Claim 8
Dependent Claim
32 words
A telephone communications system as in claim 1, wherein said telephone line connecting means of said base unit connects a plurality of telephone lines to said transmitter subsystem and said receiver subsystem.
Claim 9
Dependent Claim
229 words
A telephone communications base unit comprising: (a) a transmitter subsystem, (b) a receiver subsystem, and (c) means for connecting said transmitter subsystem and said receiver subsystem to a telephone line; said transmitter subsystem comprising: (a) means for converting first analog telephone communications signals to first digital data signals; (b) means for generating a first transmission carrier controlled by at least one multiple access means, said at least one multiple access means being selected from the group consisting of: (i) time division multiple access multiplexing means for controlling the times at which said first digital data signals are transmitted; and (ii) frequency division multiple access means for changing said transmission carrier's frequency; (c) means for generating a pseudonoise code; (d) means for modulating said first modulated transmission carrier by said first digital data signals and said pseudonoise code to produce a first direct spread code division multiple access signal; and (e) means for coupling said first direct spread code division multiple access signal to a communications medium; and said receiver subsystem comprising: (a) means for receiving a second direct spread code division multiple access signal from said communications medium; (b) means for recovering a second modulated transmission carrier from said second direct spread code division multiple access signal; and (c) means for demodulating said second modulated transmission carrier to produce second digital data corresponding to second analog telephone communications signals.
Claim 10
Dependent Claim
229 words
A telephone communications base unit comprising: (a) a transmitter subsystem, (b) a receiver subsystem, and (c) means for connecting said transmitter subsystem and said receiver subsystem to a telephone line; said transmitter subsystem comprising: (a) means for converting first analog telephone communications signals to first digital data signals; (b) means for generating a first transmission carrier controlled by at least one multiple access means, said at least one multiple access means being selected from the group consisting of: (i) time division multiple access multiplexing means for controlling the times at which said first digital data signals are transmitted; and (ii) frequency division multiple access means for changing said transmission carrier's frequency; (c) means for generating a pseudonoise code; (d) means for modulating said first modulated transmission carrier by said first digital data signals and said pseudonoise code to produce a first direct spread code division multiple access signal; and (e) means for coupling said first direct spread code division multiple access signal to a communications medium; and said receiver subsystem comprising: (a) means for receiving a second direct spread code division multiple access signal from said communications medium; (b) means for recovering a second modulated transmission carrier from said second direct spread code division multiple access signal; and (c) means for demodulating said second modulated transmission carrier to produce second digital data corresponding to second analog telephone communications signals.
Claim 11
Dependent Claim
30 words
A telephone communications base unit as in claim 8 further comprising off hook circuitry for placing said telephone line connecting means of said base unit into an off hook condition.
Claim 12
Dependent Claim
34 words
A telephone communications base unit as in claim 8, said base unit further comprising ring detect circuitry for detecting ring signals on said telephone line and transmitting a ring command to an extension unit.
Claim 13
Dependent Claim
30 words
A telephone communications base unit as in claim 8, wherein said means for coupling said direct spread code division multiple access signal to a communications medium comprises an RF antenna.
Claim 14
Dependent Claim
35 words
A telephone communications base unit as in claim 8, wherein said means for coupling said direct spread code division multiple access signal to a communications medium comprises a connection to power lines of a building.
Claim 15
Dependent Claim
33 words
A telephone communications base unit as in claim 8, wherein said telephone line connecting means of said base unit connects a plurality of telephone lines to said transmitter subsystem and said receiver subsystem.
Claim 16
Dependent Claim
214 words
A telephone communications extension unit comprising: (a) a transmitter subsystem, and (b) a receiver subsystem; said transmitter subsystem comprising: (a) means for converting first analog telephone communications signals to first digital data signals; (b) means for generating a first transmission carrier controlled by at least one multiple access means, said at least one multiple access means being selected form the group consisting of; (i) time division multiple access multiplexing means for controlling the times at which said first digital data signals are transmitted; and (ii) frequency division multiple access means for changing said transmission carrier's frequency; (c) means for generating a pseudonoise code; (d) means for modulating said first modulated transmission carrier by said first digital data signals and said pseudonoise code to produce a first direct spread code division multiple access signal; and (e) means for coupling said first direct spread code division multiple access signal to a communications medium; and said receiver subsystem comprising: (a) means for receiving a second direct spread code division multiple access signal from said communications medium; (b) means for recovering a second modulated transmission carrier from said second direct spread code division multiple access signal; and (c) means for demodulating said second modulated transmission carrier to produce second digital data corresponding to second analog telephone communications signals.
Claim 17
Dependent Claim
214 words
A telephone communications extension unit comprising: (a) a transmitter subsystem, and (b) a receiver subsystem; said transmitter subsystem comprising: (a) means for converting first analog telephone communications signals to first digital data signals; (b) means for generating a first transmission carrier controlled by at least one multiple access means, said at least one multiple access means being selected form the group consisting of; (i) time division multiple access multiplexing means for controlling the times at which said first digital data signals are transmitted; and (ii) frequency division multiple access means for changing said transmission carrier's frequency; (c) means for generating a pseudonoise code; (d) means for modulating said first modulated transmission carrier by said first digital data signals and said pseudonoise code to produce a first direct spread code division multiple access signal; and (e) means for coupling said first direct spread code division multiple access signal to a communications medium; and said receiver subsystem comprising: (a) means for receiving a second direct spread code division multiple access signal from said communications medium; (b) means for recovering a second modulated transmission carrier from said second direct spread code division multiple access signal; and (c) means for demodulating said second modulated transmission carrier to produce second digital data corresponding to second analog telephone communications signals.
Claim 18
Dependent Claim
36 words
A telephone communications extension unit as in claim 14, said extension unit further comprising ring generator circuitry for generating a ring signal in said extension unit upon receipt of a ring command from a base unit.
Claim 19
Dependent Claim
29 words
A telephone communications extension unit as in claim 14, wherein said means for coupling said direct spread code division multiple access signal a communications medium comprises an RF antenna.
Claim 20
Dependent Claim
35 words
A telephone communications extension unit as in claim 14, wherein said means for coupling said direct spread code division multiple access signal to a communications medium comprises a connection to power lines of a building.
Claim 21
Independent Claim
172 words
A method for telephone communications between a first unit and a second unit, the method comprising the steps of: (a) said first unit converting analog telephone communications signals to digital data signals; (b) said first unit generating a transmission carrier controlled by at least one multiple access technique selected form the group consisting of: (i) time division multiple access for controlling the times at which the transmission carrier is transmitted; and (ii) frequency division multiple access for changing said transmission carrier's frequency; (c) said first unit generating pseudonoise code; (d) said first unit modulating said transmission carrier with said digital data signals and said pseudonoise code to produce a direct spread code division multiple access signal; (e) said first unit transmitting said direct spread code division multiple access signal to said second unit; (f) said second unit recovering said modulated transmission carrier from said direct spread code division multiple access signal; and (g) said second unit demodulating said modulated transmission carrier to produce digital data corresponding to said analog telephone communications signals.
Claim 22
Independent Claim
172 words
A method for telephone communications between a first unit and a second unit, the method comprising the steps of: (a) said first unit converting analog telephone communications signals to digital data signals; (b) said first unit generating a transmission carrier controlled by at least one multiple access technique selected form the group consisting of: (i) time division multiple access for controlling the times at which the transmission carrier is transmitted; and (ii) frequency division multiple access for changing said transmission carrier's frequency; (c) said first unit generating pseudonoise code; (d) said first unit modulating said transmission carrier with said digital data signals and said pseudonoise code to produce a direct spread code division multiple access signal; (e) said first unit transmitting said direct spread code division multiple access signal to said second unit; (f) said second unit recovering said modulated transmission carrier from said direct spread code division multiple access signal; and (g) said second unit demodulating said modulated transmission carrier to produce digital data corresponding to said analog telephone communications signals.
Claim 23
Dependent Claim
41 words
A method for telephone communications as in claim 18, further comprising: (h) connecting one or more telephone lines to said first unit with corresponding ring, off hook and duplex audio signals to provide said first unit with a base unit capability.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |