US3908089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for adding a party to a conference in a PCM exchange
Assignee: Jeumont Schneider SA
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Filing: 1974-07-09
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Granted: 1975-09-23
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Expires: 1994-07-09
Abstract
Abstract A conference circuit for connecting a party to an existing multiple party connection in an automatic multiplex PCM exchange. Conferenced party signals are provided over a separate outgoing exchange line which is routed to an expander circuit for addition to the existing connection in the same multiplex time slot.
Inventors
- 👤 Jean A Picandet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:38
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/561
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
190 words
Apparatus for forming a conference connection to connect an additional party to an existing multiple party connection in an automatic electronic multiplex pulse code modulation (PCM) exchange comprising: a plurality of incoming PCM Lines, a plurality of outgoing PCM lines equal in number to the number of said plurality of incoming lines, each outgoing PCM line providing outgoing PCM signals, exchange connection means having input and output means for interconnecting said incoming and outgoing lines, a plurality of expander circuit means, one expander circuit means connected between the output means of said exchange connection means and each outgoing PCM line, an additional PCM line for each additional party providing PCM signals, said additional line connected between the output means of said exchange connection means and to routing means, said routing means providing additional party PCM signals in the same time slot as the existing multiple party connection, additional expander means for each additional party, said expander means connected to said routing means for providing expanded additional party PCM signals, and means for adding said expanded additional party PCM signals to said outgoing PCM signals in said existing multiple party connection.
Claim 2
Dependent Claim
190 words
Apparatus for forming a conference connection to connect an additional party to an existing multiple party connection in an automatic electronic multiplex pulse code modulation (PCM) exchange comprising: a plurality of incoming PCM Lines, a plurality of outgoing PCM lines equal in number to the number of said plurality of incoming lines, each outgoing PCM line providing outgoing PCM signals, exchange connection means having input and output means for interconnecting said incoming and outgoing lines, a plurality of expander circuit means, one expander circuit means connected between the output means of said exchange connection means and each outgoing PCM line, an additional PCM line for each additional party providing PCM signals, said additional line connected between the output means of said exchange connection means and to routing means, said routing means providing additional party PCM signals in the same time slot as the existing multiple party connection, additional expander means for each additional party, said expander means connected to said routing means for providing expanded additional party PCM signals, and means for adding said expanded additional party PCM signals to said outgoing PCM signals in said existing multiple party connection.
Claim 3
Dependent Claim
21 words
Apparatus as recited in claim 1 further comprising digital-to-analog converter means connected between said adding means and said outgoing PCM lines.
Claim 4
Dependent Claim
76 words
Apparatus as recited in claim 1 wherein said routing means comprises: a logic selector circuit for interconnecting said additional PCM lines to any one of said additional expander means in accordance with received address code signals, circulating storage means for providing said address code signals to said logic selection circuit, control logic means providing input address codes to said circulating storage means, and clock means for synchronizing said control logic means and said circulating storage means.
Claim 5
Dependent Claim
31 words
Apparatus as recited in claim 3 wherein said circulating storage means comprises a plurality of shift registers, each shift register having as many stages as time slots in the PCM multiplex.
Claim 6
Dependent Claim
30 words
Apparatus as recited in claim 4 wherein the number of shift registers is equal to n where the number of outgoing PCM lines is less than or equal to 2n.
Claim 7
Independent Claim
94 words
A method of forming a conference connection to connect an additional party to an existing multiple party connection in an automatic multiplex pulse code modulation (PCM) exchange comprising the steps of: providing expander circuits for each outgoing PCM line for providing outgoing PCM signals, providing an additional outgoing PCM line for carrying PCM signals of said additional party, feeding said additional party PCM signals to an additional expander circuit for providing expanded additional party PCM signals, and adding said expanded additional party PCM signals to said outgoing PCM signals to provide conference PCM signals.
Claim 8
Independent Claim
94 words
A method of forming a conference connection to connect an additional party to an existing multiple party connection in an automatic multiplex pulse code modulation (PCM) exchange comprising the steps of: providing expander circuits for each outgoing PCM line for providing outgoing PCM signals, providing an additional outgoing PCM line for carrying PCM signals of said additional party, feeding said additional party PCM signals to an additional expander circuit for providing expanded additional party PCM signals, and adding said expanded additional party PCM signals to said outgoing PCM signals to provide conference PCM signals.
Claim 9
Dependent Claim
20 words
A method as recited in claim 6 further comprising the step of feeding said conference PCM signals to digital-to-analog converters.
Claim 10
Dependent Claim
48 words
A method as recited in claim 6 wherein said feeding step comprises: supplying an address code identifying said outgoing line to selection means, and synchronizing said address codes to route said additional party PCM signals into the same multiplex time slot as the existing party connection time slots.
References Cited (Backward Citations)
US3420959A
Cited
US3699264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |