Patent US3706855A successfully refreshed from Google Patents.
US3706855A
Expired / Lapsed
US
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Generator for digital pulse signals representative of analog signal pairs
Assignee: AG Communication Systems Corp
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Filing: 1970-10-02
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Granted: 1972-12-19
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Expires: 1990-10-02
Abstract
Abstract A technique of multifrequency pulsing consisting of transmitting a digitally valid number over pulse code modulated carrier from a time division multiplex office. The signals generated thereby after passing through a conventional carrier channel bank would be accepted by conventional analog multifrequency receivers as utilized in the telephone industry.
Inventors
- 👤 Satyan G Pitroda
- 👤 Bernard J Rekiere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:33
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/45; H04Q1/457; H04Q1/4575; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
176 words
Means for generating a plurality of different digital signals, each representative of a different analog tone signal pair, for use in signaling iN a telephone system, comprising: common equipment, including counting means having a circuit connection to said telephone system central processing unit, operated in response to receipt of pulses from said central processing unit to count sequentially in a first direction to produce a numerical sequence of output pulses; a plurality of digital tone generators each connected to said common equipment and each including a non-destructive readout memory having circuit connections to said counting means and to said central processing unit, each operated in response to a specific particular count produced by said counting means in combination with a signal from said central processing unit, to produce a digital readout signal representative of a particular tone signal pair corresponding to a particular signal used in a telephone system; and said digital signal generators each further including a plurality of gating circuits connected to said memories operated to control the digital signal outputs of said memories.
Claim 2
Dependent Claim
176 words
Means for generating a plurality of different digital signals, each representative of a different analog tone signal pair, for use in signaling iN a telephone system, comprising: common equipment, including counting means having a circuit connection to said telephone system central processing unit, operated in response to receipt of pulses from said central processing unit to count sequentially in a first direction to produce a numerical sequence of output pulses; a plurality of digital tone generators each connected to said common equipment and each including a non-destructive readout memory having circuit connections to said counting means and to said central processing unit, each operated in response to a specific particular count produced by said counting means in combination with a signal from said central processing unit, to produce a digital readout signal representative of a particular tone signal pair corresponding to a particular signal used in a telephone system; and said digital signal generators each further including a plurality of gating circuits connected to said memories operated to control the digital signal outputs of said memories.
Claim 3
Dependent Claim
58 words
Apparatus as claimed in claim 1 wherein: said counting means comprise a bidirectional counter and wherein said common equipment further includes directional control means connected to said bidirectional counting means, operated in response to receipt of a particular count from said counting means, to condition said counting means to reverse the direction of count from said first direction.
Claim 4
Dependent Claim
46 words
Apparatus as claimed in claim 1 wherein: said common equipment further includes polarity control means including circuit connections to said directional control means and to said gating means, operated in response to said directional control means to reverse the polarity of signals transmitted from said memories.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |