US3555190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic telephone conference connector
Assignee: Television Radio and Film Communication
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Filing: 1968-01-25
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Granted: 1971-01-12
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Expires: 1988-01-25
Abstract
Abstract An automatic interconnector of two normal telephone calls from standard subscriber drops, simultaneously permitting a local party to talk with both external parties, with three-way conversation mode normal to conference telephony. Switching systems are provided for assigning priorities to each of the parties.
Inventors
- 👤 Warren L Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:30
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
234 words
An apparatus for receiving audio signals from a plurality of signal channels, for determining a priority for signals from each of said signal channels, and for supplying only one of said audio signals to a utilization means at any one time according to said priority, comprising: a. first and second signal channels respectively carrying first and second audio frequency signals; b. first adjusting signal switch means responsive to the presence of said first audio frequency signal and to the absence of said second audio frequency signal for more than a predetermined time for generating a first adjusting signal; c. second adjusting signal switch means responsive to the presence of said second audio frequency signal and to the absence of said first audio frequency signal for more than a predetermined time for generating a second adjusting signal; and d. first and second signal magnitude adjustment means respectively receiving said first and second audio frequency signals and responsive respectively to said second and first adjusting signals for varying the amplitude of said first and second audio frequency signals supplied to said utilization means. CM,2Paratus according to claim 1 further comprising an inhibiting switch means responsive to the continuing presence of said one of said first and second audio frequency signals to inhibit said adjusting signal switch means form causing said other of said first and second audio frequency signals to be supplied to said utilization means.
Claim 2
Dependent Claim
17 words
Apparatus according to claim 2 wherein each of said adjusting signals has one of two possible magnitudes.
Claim 3
Dependent Claim
77 words
An apparatus according to claim 2 further comprising: e. a third signal channel carrying a third audio frequency signal to said utilization means; f. override switch means responsive to the presence of a third audio frequency signal to generate an override adjustment signal; and g. means to supply said override adjustment signal to said first and second signal magnitude adjustment means to cause said first and second audio frequency signals to be supplied to said utilization means.
Claim 4
Dependent Claim
86 words
An apparatus according to claim 1 further comprising: means, responsive to the presence of said first audio signal and to the absence of said second audio signal for more than a predetermined length of time for supplying said first audio frequency signal to said second signal channel and means, responsive to the presence of said second audio signal and to the absence of said first audio signal for more than a predetermined length of time, for supplying said second audio signal to said first signal channel.
Claim 5
Independent Claim
167 words
An apparatus for receiving audio signals from a plurality to signal channels, for determining a priority for signals from each of said signal channels, and for supplying only one of said audio signals to utilization means at any one time according to said priority comprising: a. a first signal channel carryIng a first audio frequency signal; b. a signal magnitude adjustment means for supplying said first audio frequency signal to said utilization means. c. a second signal channel for supplying a second audio frequency signal to said utilization means; d. switch means responsive to the presence of said second audio frequency signal for generating a control signal; e. means for supplying said second audio frequency signal to said switch means only when said second audio frequency signal contains frequencies below a predetermined lower frequency or above a predetermined higher frequency; and f. means responsive to said control signal for causing said signal magnitude adjustment means to not supply said first audio frequency signal to said utilization means.
Claim 6
Independent Claim
167 words
An apparatus for receiving audio signals from a plurality to signal channels, for determining a priority for signals from each of said signal channels, and for supplying only one of said audio signals to utilization means at any one time according to said priority comprising: a. a first signal channel carryIng a first audio frequency signal; b. a signal magnitude adjustment means for supplying said first audio frequency signal to said utilization means. c. a second signal channel for supplying a second audio frequency signal to said utilization means; d. switch means responsive to the presence of said second audio frequency signal for generating a control signal; e. means for supplying said second audio frequency signal to said switch means only when said second audio frequency signal contains frequencies below a predetermined lower frequency or above a predetermined higher frequency; and f. means responsive to said control signal for causing said signal magnitude adjustment means to not supply said first audio frequency signal to said utilization means.
References Cited (Backward Citations)
US2189306A
Cited
US2164752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |