US3851112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data detector with voice signal discrimination
Assignee: AG Communication Systems Corp
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Filing: 1973-04-26
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Granted: 1974-11-26
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Expires: 1993-04-26
Abstract
Abstract A circuit for detection of data signals as used in telephone switching systems. The circuitry detects the presence of actual data signals, while discriminating against voice signals that include frequency components that might be similar to data signals.
Inventors
- 👤 L Kusan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:33
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/46
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
123 words
A data detector for use with a data receiver connected to a communication channel over which voice signals and tone signals are received, said data detector comprising: first gating means connected to said data receiver operated in response to concurrent receipt of a plurality of signals in a first band of frequencies; second gating means connected to said data receiver operated in response to concurrent receipt of a plurality of signals in a second band of frequencies; and signal generating means connected to said first and to said second gating means, including an output circuit connection to said data receiver, operated in response to either said first or second gating means to generate an output signal to inhibit operation of said data receiver.
Claim 2
Dependent Claim
123 words
A data detector for use with a data receiver connected to a communication channel over which voice signals and tone signals are received, said data detector comprising: first gating means connected to said data receiver operated in response to concurrent receipt of a plurality of signals in a first band of frequencies; second gating means connected to said data receiver operated in response to concurrent receipt of a plurality of signals in a second band of frequencies; and signal generating means connected to said first and to said second gating means, including an output circuit connection to said data receiver, operated in response to either said first or second gating means to generate an output signal to inhibit operation of said data receiver.
Claim 3
Dependent Claim
64 words
A data detector as claimed in claim 1 wherein: said first and second gating means each comprise, a comparator circuit connected between said data receiver and a source of reference potential; said comparator circuit operated to generate an output to operate said signal generating means in response to the combined amplitude of concurrently received signals within a band of frequencies exceeding said reference potential.
Claim 4
Dependent Claim
38 words
A data detector as claimed in claim 1 wherein: said signal generating means comprises a transistorized switch, operated in response to either said first or second gating means, to connect a source of potential to said data receiver.
Claim 5
Dependent Claim
106 words
A data detector as claimed in claim 1 wherein there is further included: third gating means connected to said data receiver, operated in response to receipt of a tone signal in said first band of frequencies; fourth gating means connected to said data receiver operated in response to receipt of a tone signal in said second band of frequencies; and first switching means connected to said third gating means and to said fourth gating means, including an output circuit connection to said dating receiver, operated in response to concurrent operation of both said third and fourth gating means to enable the operation of said data receiver.
Claim 6
Dependent Claim
62 words
A data detector as claimed in claim 4 wherein: said third and fourth gating means each include a comparator circuit connected between said data receiver and a source of reference potential; said comparator circuit operated to generate an output to said first switching means in response to the amplitude of received tone signals within a band of frequencies exceeding said reference potential.
Claim 7
Dependent Claim
46 words
A data detector as claimed in claim 4 wherein: said first switching means comprise a bistable multivibrator set to a first stable state in response to the concurrent operation of said third and fourth gating means, to conduct a source of potential to said data receiver.
Claim 8
Dependent Claim
101 words
A data detector as claimed in claim 4 wherein there is further included: second switching means including input circuit connections from said third gating means and from said fourth gating means, said second switching means operated in response to concurrent operation of said third and fourth gating means; said first switching means further including input circuit connections from said data receiver; and said first switching means further operated in response to concurrent operation of said second switching means and receipt of a supervisory tone signal from said data receiver over said input circuit connections, to enable operation of said data receiver.
Claim 9
Dependent Claim
31 words
A data detector as claimed in claim 7 wherein: said second switching means comprise a transistor switch operated in response to said concurrent operation of said third and fourth gating means.
Claim 10
Dependent Claim
43 words
A data detector as claimed in claim 4 wherein there is further included: reset means connected between said data receiver and said first switching means, operated in response to a reset signal from said data receiver, to render said first switching means inoperative.
Claim 11
Dependent Claim
71 words
A data detector as claimed in claim 9, wherein: said first switching means comprise a bistable multivibrator set to a first stable state in response to the concurrent operation of said third and fourth gating means, to conduct a source of potential to said data receiver, and set to a second stable state in response to operation of said reset means to remove said source of potential from said data receiver.
Claim 12
Dependent Claim
48 words
A data detector as claimed in claim 10 wherein: said reset means comprise a monostable multivibrator, operated in response to a reset signal from said data receiver to transmit a pulse to said first switching means, whereby said first switching means are operated to said second stable state.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |