Patent US1617675A successfully refreshed from Google Patents.
EP0213342A2
Expired / Lapsed
EP
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Programmable ring signal generator
Assignee: Alcatel Lucent NV
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Filing: 1986-07-11
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Granted: —
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Expires: 2006-07-11
Abstract
Abstract A digitally controlled ring signal generator includes a plurality of ring signal generating sources (16) providing a plurality of inputs to each of a plurality of ring circuits (10; 12). Each input is an a.c. signal superimposed on a d.c. bias (14) that is greater than or equal to the peak voltage of the a.c. signal.
Inventors
- 👤 Ramon C. W. Chea, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 10:04
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/023
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
A digitally controlled ring signal generator comprising: means for generating a ring signal, said means selectively amplifying one of a plurality of ringing signals, each of said plurality of ringing signals having a unique frequency whereby immediate ringing is available to one or more subscriber lines; means for sensing a loop current means, responsive to said sensed loop current, for generating ringing supervisory signals; means, responsive to said generating ringing supervisory signals and an external data input, for providing an output control signal; and a ring signal reference source, said ring signal reference source being responsive to said output control signal, for coupling said ringing signals to said ring signal generating means whereby the characteristics of said ringing signals are selectable in accordance with said external data input and the presence or absence of said generated ringing signals being determined by said ringing supervisory signals, said ring signal reference source having a d.c. voltage source and a sinusoidal voltage source, said d.c. voltage source having a fixed voltage potential, said fixed voltage potential being greater than or equal to the peak amplitude of said sinusoid.
Claim 2
Dependent Claim
185 words
A digitally controlled ring signal generator comprising: means for generating a ring signal, said means selectively amplifying one of a plurality of ringing signals, each of said plurality of ringing signals having a unique frequency whereby immediate ringing is available to one or more subscriber lines; means for sensing a loop current means, responsive to said sensed loop current, for generating ringing supervisory signals; means, responsive to said generating ringing supervisory signals and an external data input, for providing an output control signal; and a ring signal reference source, said ring signal reference source being responsive to said output control signal, for coupling said ringing signals to said ring signal generating means whereby the characteristics of said ringing signals are selectable in accordance with said external data input and the presence or absence of said generated ringing signals being determined by said ringing supervisory signals, said ring signal reference source having a d.c. voltage source and a sinusoidal voltage source, said d.c. voltage source having a fixed voltage potential, said fixed voltage potential being greater than or equal to the peak amplitude of said sinusoid.
Claim 3
Dependent Claim
48 words
A digitally controlled ring signal generator as claimed in Claim 1 wherein said ring signal generation circuit means includes a d.c. to d.c. flyback converter for amplifying said ringing signals from low amplitude to high amplitude ringing signals, said d.c. to d.c. converter including a ferrite pulse transformer.
Claim 4
Dependent Claim
37 words
A digitally controlled ring signal generator as claimed in Claim 1 wherein said external data input is comprised of processor output control data, said output control data being variable in accordance with the programming of said processor.
Claim 5
Dependent Claim
38 words
A digitally controlled ring signal generator as claimed in Claim 3 wherein said ring circuit control logic means includes means for generating a ring circuit energizing signal for selectively enabling and disabling said ring signal generation circuit means.
Claim 6
Dependent Claim
59 words
A digitally controlled ring signal generator as claimed in Claim 1 wherein said ring supervision circuit means includes ring-trip detection means responsive to subscriber OFF-Hook signal, and a ring presence detector means responsive to loop current sensing means, said ring trip detection means and said ring presence detector means each having an output corresponding to said ringing supervisory signals.
Claim 7
Dependent Claim
52 words
A digitally controlled ring signal generator as claimed in Claim 5 wherein said ring-trip detection means comprises: low-pass filter means having said sensed loop current coupled thereto and having an a.c. filtered output; and comparator means for comparing said a.c. filtered output to a reference signal for generating a ring-trip signal output.
Claim 8
Dependent Claim
64 words
A digitally controlled ring signal generator as claimed in Claim 5 wherein said ring presence detector means comprises: peak detector means having a signal representative of said sensed loop current coupled thereto and having an output; and comparator means for comparing the output of said peak detector means to a reference and for generating a ring presence signal output in response to said comparison.
References Cited (Backward Citations)
No citation records indexed.
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