US3879583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reconstruction of telephone dial signals
Assignee: K SON CORP
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Filing: 1973-08-17
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Granted: 1975-04-22
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Expires: 1993-08-17
Abstract
Abstract Apparatus for the reconstruction of a telephone dial signal of the type consisting of a series of interruptions of a DC signal on a conventional telephone line. The present apparatus receives signals from the telephone line, continuously generates and sustains a reference voltage level which is a fixed percentage of the peak value of the received signal, provides an output whenever the received signal level exceeds the reference voltage level whereby one or more outputs occur at the beginning and at the end of each interruption of the dial signal, converts multiple outputs ocurring at the beginning and at the end of each interruption into unitary output signals, and passes a single output signal for each interruption of the dial signal, the receiving station thereby having an accurate indication of the original dialed information.
Inventors
- 👤 Ernest F Rooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:31
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/32; H04Q1/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
Apparatus for reconstructing a telephone dial signal of the type consisting of a series of interruptions of a DC signal on a conventional telephone line comprising: means for receiving signals from said telephone line; means responsive to said receiving means for continuously generating and sustaining a reference voltage level which is a fixed percentage of the peak value of said signals received from said telephone line; means responsive to said receiving means and said reference voltage level generating means for providing an output, on a real time basis, whenever said received signal level exceeds said reference voltage level, at least one output occurring at the beginning and at the end of each interruption of said dial signal; and means responsive to said output providing means for converting multiple outputs occurring at the beginning and at the end of each interruption of said dial signal into unitary output signals occurring at the beginning and at the end of each said interruption.
Claim 2
Dependent Claim
160 words
Apparatus for reconstructing a telephone dial signal of the type consisting of a series of interruptions of a DC signal on a conventional telephone line comprising: means for receiving signals from said telephone line; means responsive to said receiving means for continuously generating and sustaining a reference voltage level which is a fixed percentage of the peak value of said signals received from said telephone line; means responsive to said receiving means and said reference voltage level generating means for providing an output, on a real time basis, whenever said received signal level exceeds said reference voltage level, at least one output occurring at the beginning and at the end of each interruption of said dial signal; and means responsive to said output providing means for converting multiple outputs occurring at the beginning and at the end of each interruption of said dial signal into unitary output signals occurring at the beginning and at the end of each said interruption.
Claim 3
Dependent Claim
160 words
Apparatus for reconstructing a telephone dial signal of the type consisting of a series of interruptions of a DC signal on a conventional telephone line comprising: means for receiving signals from said telephone line; means responsive to said receiving means for continuously generating and sustaining a reference voltage level which is a fixed percentage of the peak value of said signals received from said telephone line; means responsive to said receiving means and said reference voltage level generating means for providing an output, on a real time basis, whenever said received signal level exceeds said reference voltage level, at least one output occurring at the beginning and at the end of each interruption of said dial signal; and means responsive to said output providing means for converting multiple outputs occurring at the beginning and at the end of each interruption of said dial signal into unitary output signals occurring at the beginning and at the end of each said interruption.
Claim 4
Dependent Claim
160 words
Apparatus for reconstructing a telephone dial signal of the type consisting of a series of interruptions of a DC signal on a conventional telephone line comprising: means for receiving signals from said telephone line; means responsive to said receiving means for continuously generating and sustaining a reference voltage level which is a fixed percentage of the peak value of said signals received from said telephone line; means responsive to said receiving means and said reference voltage level generating means for providing an output, on a real time basis, whenever said received signal level exceeds said reference voltage level, at least one output occurring at the beginning and at the end of each interruption of said dial signal; and means responsive to said output providing means for converting multiple outputs occurring at the beginning and at the end of each interruption of said dial signal into unitary output signals occurring at the beginning and at the end of each said interruption.
Claim 5
Dependent Claim
23 words
Apparatus according to claim 1 further comprising: low pass filter means interposed between said receiving means and said reference voltage level generating means.
Claim 6
Dependent Claim
23 words
Apparatus according to claim 1 further comprising: full wave rectifier means interposed between said receiving means and said reference voltage level generating means.
Claim 7
Dependent Claim
21 words
Apparatus according to claim 1 wherein said reference voltage level is approximately two-thirds of the peak value of said received signal.
Claim 8
Dependent Claim
26 words
Apparatus according to claim 1 further comprising: means responsive to said converting means for passing a single output signal for each interruption of said dial signal.
Claim 9
Dependent Claim
85 words
Apparatus according to claim 5 wherein said passing means comprises: means responsive to said converting means for generating a gating signal a predetermined time interval after each output signal, said time interval corresponding to the duration of said interruption of said dial signal; and gating means responsive to said converting means and said gating signal generating means for passing only those output signals which occur during a gating signal, each of said passed output signals representing the end of an interruption of said dial signal.
Claim 10
Dependent Claim
30 words
Apparatus according to claim 1 wherein said output providing means comprises: detector means for generating a logical 1 signal level whenever said received signal level exceeds said reference voltage level.
Claim 11
Dependent Claim
51 words
Apparatus according to claim 7 wherein said converting means comprises: digital filter means for generating a logical 1 signal level in response to multiple outputs occurring at the beginning and at the end of each interruption of said dial signal and for generating a logical 0 level between such multiple outputs.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |