Patent US3904831A successfully refreshed from Google Patents.
US3904831A
Expired / Lapsed
US
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Tone control arrangement for electronic PABX
Assignee: Telex Computer Products Inc
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Filing: 1974-01-09
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Granted: 1975-09-09
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Expires: 1994-01-09
Abstract
Abstract A tone control arrangement for an electronic telephone system wherein a plurality of tone generators are selectively connected to respective line circuits via a tone matrix under control of a common control. The tone matrix includes a plurality of cross points which are sequentially scanned and the common control includes matrix control means for selectively actuating cross points of the tone matrix as they are being scanned.
Inventors
- 👤 Uwe A Pommerening
- 👤 Glenn L Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:02
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42; H04Q3/52; H04Q3/521
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
208 words
In an electronic telephone system including a plurality of line circuits, a plurality of junctor circuits, a first switching matrix connected to said line circuits and said junctor circuits and common control means for controlling said switching matrix to connect a line circuit to a junctor circuit and to another line circuit, tone supplying means for applying a selected one of a plurality of tones to said line circuits comprising a plurality of tone generators and a second switching matrix connected to said tone generators and said junctor circuits for selectively connecting a tone generator through a junctor circuit and said first switching matrix to a selected line circuit under contrOl of said common control means, said second switching matrix including first and second sets of coordinate lines interconnected at their cross points by respective matrix switches, said tone generators being connected to respective ones of said first set of lines and said junctor circuits being connected to respective ones of said second set of lines, said common control means including clock means for sequentially enabling each switch of the group of matrix switches of said second switching matrix associated with each junctor so as to scan each group of switches in the order of said junctor circuits.
Claim 2
Dependent Claim
208 words
In an electronic telephone system including a plurality of line circuits, a plurality of junctor circuits, a first switching matrix connected to said line circuits and said junctor circuits and common control means for controlling said switching matrix to connect a line circuit to a junctor circuit and to another line circuit, tone supplying means for applying a selected one of a plurality of tones to said line circuits comprising a plurality of tone generators and a second switching matrix connected to said tone generators and said junctor circuits for selectively connecting a tone generator through a junctor circuit and said first switching matrix to a selected line circuit under contrOl of said common control means, said second switching matrix including first and second sets of coordinate lines interconnected at their cross points by respective matrix switches, said tone generators being connected to respective ones of said first set of lines and said junctor circuits being connected to respective ones of said second set of lines, said common control means including clock means for sequentially enabling each switch of the group of matrix switches of said second switching matrix associated with each junctor so as to scan each group of switches in the order of said junctor circuits.
Claim 3
Dependent Claim
44 words
The system defined in claim 1, wherein said second switching matrix is formed as a solid state matrix of transistor cross point switches each actuated in response to an enabling signal and an operating signal and reset in response to only an enabling signal.
Claim 4
Dependent Claim
93 words
The system defined in claim 2, wherein said common control means further includes status control means responsive to the condition of said line circuits and signals received therefrom for determining which line circuits are to be connected to said tone generators, and matrix control means responsive to said clock means and said status control means for applying an operating signal to all of said matrix switches of said second switching matrix at the time a selected switch associated with a particular junctor and a selected tone generator is enabled by said clock means.
Claim 5
Dependent Claim
153 words
In an electronic telephone system including a plurality of line circuits, a plurality of junctor circuits, a first switching matrix connected to said line circuits and said junctor circuits and common control means for controlling said switching matrix to connect a line circuit to a junctor circuit and to another line circuit, tone supplying means for applying a selected one of a plurality of tones to said line circuits comprising a plurality of tone generators and a second switching matrix connected to said tone generators and said junctor circuits for selectively connecting a tone generator through a junctor circuit and said first switching matrix to a selected line circuit under control of said common control means, said second switching matrix being formed as a solid state matrix of transistor cross point switches each actuated in response to an enabling signal and an operating signal and reset in response to only an enabling signal.
Claim 6
Dependent Claim
153 words
In an electronic telephone system including a plurality of line circuits, a plurality of junctor circuits, a first switching matrix connected to said line circuits and said junctor circuits and common control means for controlling said switching matrix to connect a line circuit to a junctor circuit and to another line circuit, tone supplying means for applying a selected one of a plurality of tones to said line circuits comprising a plurality of tone generators and a second switching matrix connected to said tone generators and said junctor circuits for selectively connecting a tone generator through a junctor circuit and said first switching matrix to a selected line circuit under control of said common control means, said second switching matrix being formed as a solid state matrix of transistor cross point switches each actuated in response to an enabling signal and an operating signal and reset in response to only an enabling signal.
Claim 7
Dependent Claim
22 words
The system defined in claim 4, wherein said first matrix is formed as a solid state matrix of transistor cross point switches.
Claim 8
Dependent Claim
43 words
The system defined in claim 4, wherein said second switching matrix is coupled to said first switching matrix by an attenuating network which includes a solid state switch which substantially eliminates signal loss when said second switching matrix is in an unoperated condition.
Claim 9
Dependent Claim
58 words
The system defined in claim 4, wherein said common control means includes clock means for applying an enabling signal to the cross point switches of said second switching matrix so as to sequentially scan each switch of the group of switches associated with each junctor and to scan each group of switches in the order of said junctors.
Claim 10
Dependent Claim
41 words
The system defined in claim 7, wherein said common control means further includes status control means responsive to the condition of said line circuits and signals received therefrom for determining which line circuits are to be connected to said tone generators.
Claim 11
Dependent Claim
53 words
The system defined in claim 8, wherein said common control means further includes matrix control means responsive to said clock means and said status control means for applying operating signals to said cross point switches of said second switching matrix in coincidence with the application of enabling signals thereto from said clock means.
Claim 12
Dependent Claim
22 words
The system defined in claim 9, wherein said first matrix is formed as a solid state matrix of transistor cross point switches.
Claim 13
Dependent Claim
34 words
The system defined in claim 9, further including a source of music connected to said second switcHing matrix for applying a music signal to selected line circuits under control of said common control means.
Claim 14
Dependent Claim
29 words
The system defined in claim 9, wherein said matrix control means includes means for pulsing said operating signals to operate a selected cross point switch in a pulsed manner.
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |