US3622997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal discriminator for time-sharing communication system having periodic line sampling
Assignee: Italtel SpA
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Filing: 1970-04-20
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Granted: 1971-11-23
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Expires: 1990-04-20
Abstract
Abstract To distinguish between DC pulses of different length detected by periodic sampling of a given transmission line, a data processor evaluates a combination of criteria including the instantaneously sampled line voltage (A), the continuity or lack of continuity of that voltage for a prolonged period (D6''), and the output of the data processor in a preceding sampling interval. This output is preserved, for subsequent reevaluation, in the form of a digital code stored in a time slot of a circulating memory assigned to the line under test. Some of the output signals of the data processor identify transitory conditions which, in the next evaluation cycle, must be converted into one of two possible definite conditions recognized as significant line-voltage criteria.
Inventors
- 👤 Luigi Casella
- 👤 Aldo Perna
- 👤 Giuseppe Valbonesi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:54
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/40; H04J; H04J7/00; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
In a telecommunication system having at least one channel with two significant states of energization subject to changeover at intervals of different duration, the combination therewith of sampling means for periodically determining the state of energization of said channel; data processing means connected to said sampling means for receiving an input signal characteristic of said state of energization during successive evaluation periods and for deriving therefrom a corresponding output signal, said data processing means including detector means for ascertaining a change in said input signal indicative of a changeover in said state of energization between successive evaluation periods; counting means in said data processing means responsive to said detector means for generating a continuity signal upon said input remaining unchanged for a predetermined number of consecutive evaluation periods; a logical circuitry in said data processing means for modifying the output signal derived from an input signal during any evaluation period in response to said continuity signal.
Claim 2
Dependent Claim
156 words
In a telecommunication system having at least one channel with two significant states of energization subject to changeover at intervals of different duration, the combination therewith of sampling means for periodically determining the state of energization of said channel; data processing means connected to said sampling means for receiving an input signal characteristic of said state of energization during successive evaluation periods and for deriving therefrom a corresponding output signal, said data processing means including detector means for ascertaining a change in said input signal indicative of a changeover in said state of energization between successive evaluation periods; counting means in said data processing means responsive to said detector means for generating a continuity signal upon said input remaining unchanged for a predetermined number of consecutive evaluation periods; a logical circuitry in said data processing means for modifying the output signal derived from an input signal during any evaluation period in response to said continuity signal.
Claim 3
Dependent Claim
56 words
The defined in claim 1, further comprising storage means connected to said data processing means for preserving the output signal thereof to at least the next evaluation period, said logical circuitry being responsive to said storage means for further modifying an instant output signal in accordance with the output signal preserved from the preceding evaluation period.
Claim 4
Dependent Claim
14 words
The combination defined in claim 2 wherein said storage means comprises a circulating memory.
Claim 5
Dependent Claim
32 words
The combination defined in claim 3 wherein said sampling means comprises a scanner for a multiplicity of channels and a source of timing pulses recurring after a predetermined number of scanning cycles.
Claim 6
Dependent Claim
30 words
The combination defined in claim 4 wherein said memory has an operating cycle equal to a scanning cycle for the recirculation of a digital code corresponding to said output signal.
Claim 7
Dependent Claim
94 words
The combination defined in claim 2 wherein said logical circuitry is provided with a group of external output circuits and with a group of internal output circuits, said internal output circuits being energizable only temporarily, for a single evaluation period, in response to certain combinations of signals from said scanning means and said storage means to indicate a transitory condition to be converted into a definite state, with energization of a corresponding external output, during the next evaluation period, said storage means being connected to both said groups for registering the output signals thereof.
References Cited (Backward Citations)
US3204037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |