Patent US3674936A successfully refreshed from Google Patents.
US3674936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voice conference system
Assignee: Unisys Corp
•
Filing: 1970-02-26
•
Granted: 1972-07-04
•
Expires: 1990-02-26
Abstract
Abstract The present application discloses a voice conference system which may be utilized to provide virtual cut-through (VCT) service when used in conjunction with a modular data processor in a store and forward message switching system. The virtual cutthrough service so provided allows the transmission of continuous traffic as well as digital voice communications. This feature coupled with other novel characteristics of the system make it possible to implement an extremely effective secure voice conference service.
Inventors
- 👤 Fred G Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:28
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
174 words
A secure voice conference system comprising a switching center including a plurality of incoming channels, a plurality of outgoing channels, a plurality of functional modules connected therebetween for transferring all data received by said incoming channels directly to the proper outgoing channels without inspection of the information contained in said received data, at least one of said plurality of functional modules being a computing module and including means for selectively activating the one of said incoming channels having the highest precedence of a predetermined priority, a plurality of subscriber sets, each having an enciphering means, a deciphering means, a digital to voice conversion means and a voice to digital conversion means adapted to receive audio signals and couple its corresponding digital output signals to said enciphering means for entry via one of said incoming channels to said switching center, said digital to voice conversion means similarly adapted to provide audio output signals upon receipt of corresponding digital signals from said deciphering means for exit via one of said outgoing channels from said switching center.
Claim 2
Dependent Claim
174 words
A secure voice conference system comprising a switching center including a plurality of incoming channels, a plurality of outgoing channels, a plurality of functional modules connected therebetween for transferring all data received by said incoming channels directly to the proper outgoing channels without inspection of the information contained in said received data, at least one of said plurality of functional modules being a computing module and including means for selectively activating the one of said incoming channels having the highest precedence of a predetermined priority, a plurality of subscriber sets, each having an enciphering means, a deciphering means, a digital to voice conversion means and a voice to digital conversion means adapted to receive audio signals and couple its corresponding digital output signals to said enciphering means for entry via one of said incoming channels to said switching center, said digital to voice conversion means similarly adapted to provide audio output signals upon receipt of corresponding digital signals from said deciphering means for exit via one of said outgoing channels from said switching center.
Claim 3
Dependent Claim
55 words
The system as set forth in claim 1 wherein each of said subscriber sets includes means for interrupting said received audio input signals and inserting a data word into the incoming stream of audio signals at an interrupting period and rate such as to be substantially harmless to the voice quality of the audio signals.
Claim 4
Dependent Claim
31 words
The system as set forth in claim 2 wherein further means are included for inserting into said data word a synchronizing marker code to identify said information as a data word.
Claim 5
Dependent Claim
28 words
The system as set forth in claim 3 including further means in each of said subscriber sets for inserting a priority cut-in binary signal into said data word.
Claim 6
Dependent Claim
29 words
The system as set forth in claim 4 wherein each of said subscriber sets also includes means for inserting a plurality of talk request signals into said data word.
Claim 7
Dependent Claim
28 words
The system as set forth in claim 5 wherein each of said subscriber sets further includes means for inserting into said data word a plurality of conferee-present signals.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |