US3699264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conference circuit for pulse code modulated telephony
Assignee: AG Communication Systems Corp
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Filing: 1971-03-02
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Granted: 1972-10-17
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Expires: 1991-03-02
Abstract
Abstract A technique for connecting a plurality of telephone channels operated on a pulse code modulated basis, in a conference arrangement. Digital signals are not converted to analog, rather binary words are compared from the participating channels, with the largest binary number selected as the speaker.
Inventors
- 👤 Saytan G Pitroda
- 👤 Bernard J Rekiere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:59
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56; H04M3/568; H04M3/569
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
In a pulse code modulated communication system, a plurality of communication channels arranged on a multiplex basis, a switching system including a junctor accessed by said communication channels and a conference circuit connected to said junctor, said conference circuit comprising: a comparison circuit; first and second registers, each including a plurality of input circuit connections extending to said junctor and each including a plurality of output circuit connections to said comparison circuit; the binary value of information from each of said channels conducted through said junctor sequentially to said conference circuit; said information stored in said registers on a step-by-step comparative basis, wherein the higher value information from any of two channels is retained in one of said registers, and the lower value of said information is released from said other register, said releasing register storing information from another channel for further comparison with the iNformation stored in said retaining register; said retaining and releasing of information from said registers controlled in response to a determination of which of said registers contains the higher value of said information, by said comparison means; the information from that channel having the highest value of information transmitted during a particular time period, retransmitted from said conference circuit through said junctor to all of said channels, except said channel originating said highest binary value information.
Claim 2
Dependent Claim
221 words
In a pulse code modulated communication system, a plurality of communication channels arranged on a multiplex basis, a switching system including a junctor accessed by said communication channels and a conference circuit connected to said junctor, said conference circuit comprising: a comparison circuit; first and second registers, each including a plurality of input circuit connections extending to said junctor and each including a plurality of output circuit connections to said comparison circuit; the binary value of information from each of said channels conducted through said junctor sequentially to said conference circuit; said information stored in said registers on a step-by-step comparative basis, wherein the higher value information from any of two channels is retained in one of said registers, and the lower value of said information is released from said other register, said releasing register storing information from another channel for further comparison with the iNformation stored in said retaining register; said retaining and releasing of information from said registers controlled in response to a determination of which of said registers contains the higher value of said information, by said comparison means; the information from that channel having the highest value of information transmitted during a particular time period, retransmitted from said conference circuit through said junctor to all of said channels, except said channel originating said highest binary value information.
Claim 3
Dependent Claim
47 words
The combination as claimed in claim 1 wherein said conference circuit includes: a present-speaker memory connected to said channels, and to said comparison means, operated in response to said comparison means to identify said channel originating the highest binary value of information during said particular time period.
Claim 4
Dependent Claim
61 words
The combination as claimed in claim 2 wherein said conference circuit further includes: a last-speaker memory connected to said present-speaker memory, operated in response to said present-speaker memory to identify the channel originating the highest binary value of information during that period immediately preceding said particular period during which said present-speaker memory identified said channel originating said highest value of information.
Claim 5
Dependent Claim
98 words
The combination as claimed in claim 3 wherein said conference circuit further includes: first gating means including a plurality of input circuit connections from said first and said second registers, and a circuit connection to said comparison circuit; a third register connected to the output of said first gating means; said gating means operated in response to said comparison means to conduct information from that register containing the higher value of binary information as determined by said comparison circuit, through said gating means to said third register, to store said higher value of information in said third register.
Claim 6
Dependent Claim
72 words
The combination as claimed in claim 4 wherein said conference circuit further includes: second gating means having a plurality of input connections from said third register and a plurality of output connections to said telephone switching system junctor, said output gating means operated in response to said present-speaker memory to extend said information stored in said third register to all of said channels except said channel originating said highest binary value information.
Claim 7
Dependent Claim
93 words
The combination as claimed in claim 5 wherein said conference circuit further includes: a fourth register including a plurality of input circuit connections from said highway junctor and a plurality of output circuit connections to said second gating means; said fourth register also including an operating circuit connection from said last-speaker memory; said fourth register operated in response to said last-speaker memory to conduct the highest value of binary information from the time period preceding said particular time period, to said channel containing said highest value of binary information during said particular period.
References Cited (Backward Citations)
US3508007A
Cited
US3604855A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |