Patent US4168399A successfully refreshed from Google Patents.
US4168399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paging encoder system utilizing a telephone line link
Assignee: Motorola Solutions Inc
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Filing: 1978-05-05
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Granted: 1979-09-18
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Expires: 1998-05-05
Abstract
Abstract A base station encoder is connected to a decoder terminal and paging transmitter by means of a single voice-pair telephone line link. Automatic operations reduce operator fatigue and operating costs. Digital, tone-keyed gain controls automatically compensate for line losses. All dialing, including long distance and overseas calls, and station identification are done automatically.
Inventors
- 👤 Thomas V. D'Amico
- 👤 Mark H. Rackin
- 👤 Victor Jensen
- 👤 Norman E. Schultz
- 👤 John J. Cady
- 👤 William J. Macko
- 👤 Carl R. Steinbach
- 👤 Nicholas Petrakos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:32
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/18; H04W88/185; H04W88/188; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A digital gain control circuit comprising programmable gain amplifier means, binary counter means coupled to at least one gain control input of said amplifier means, control means including control circuits operatively coupled to the counter means, threshold detector means coupled to an output of the amplifier means and to an input of the control means, switchable-range gain control means coupled to said output of the gain amplifier means and to an output of the control means, tone detector means coupled to an output of the switchable-range gain control means and to an input of the control means.
Claim 2
Dependent Claim
97 words
A digital gain control circuit comprising programmable gain amplifier means, binary counter means coupled to at least one gain control input of said amplifier means, control means including control circuits operatively coupled to the counter means, threshold detector means coupled to an output of the amplifier means and to an input of the control means, switchable-range gain control means coupled to said output of the gain amplifier means and to an output of the control means, tone detector means coupled to an output of the switchable-range gain control means and to an input of the control means.
Claim 3
Dependent Claim
51 words
A digital gain control circuit in accordance with claim 1 and wherein, the control means further includes resetting means which in the absence of a received signal, resets the binary counter means, sets the gain of the amplifier means at minimum, and sets the switchable-range gain control means for wide range.
Claim 4
Dependent Claim
28 words
A digital gain control circuit in accordance with claim 1 and wherein the programable gain amplifier means is coupled to receive signal from a pair of telephone lines.
Claim 5
Dependent Claim
51 words
A digital gain control circuit in accordance with claim 3 and wherein the tone detector means includes activating means which activates the counting sequence of the counter means when a predetermined tone is detected, the gain of the amplifier means being controlled in response to the count of the counter means.
Claim 6
Dependent Claim
77 words
A digital gain control circuit in accordance with claim 4 wherein the threshold detector means includes signalling means which provides an output signal in response to a predetermined level of output signal from the amplifier means and wherein the counting sequence of the counter means is controllable in response to the output signal of the threshold detector means whereby said predetermined level of output signal is maintained during the reception of a signal from the telephone lines.
Claim 7
Dependent Claim
42 words
A digital gain control circuit in accordance with claim 5 and wherein the switchable-range gain control means includes mode setting means which switches said gain control means to a narrow range mode when the counter means stops counting and maintains a count.
References Cited (Backward Citations)
US3470480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |