US4718080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microprocessor controlled interface for cellular system
Assignee: Individual
•
Filing: 1985-12-16
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Granted: 1988-01-05
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Expires: 2005-12-16
Abstract
Abstract A microprocessor-controlled interface for a cellular radio telephone system enables the user to communicate with such system by means of conventional telephony devices. A standard telephone outlet communicates with the transceiver logic bus through a microprocessor. Switches are provided for controlling the audio path between the handset and the transceiver of the mobile, vehicular-mounted unit in response to the status of the interface outlet. The microprocessor interprets both the transceiver bus and various signals generated by the operation of a device that is plugged into the interface so that the operation of the device is rendered fully compatible with the cellular system. The microprocessor is programmed to decode known manufacturer protocols whereby the interface is able to render itself compatible with various equipment types.
Inventors
- 👤 Arthur L. Serrano
- 👤 Andrew W. Holman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/021
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
145 words
Apparatus for interfacing a standard telephone outlet with a cellular system, said cellular system being characterized by a radio transceiver adapted to communicate directly with a handset of compatible design so that audio is transmitted between said handset and a central office, said apparatus comprising, in combination: (a) means for observing the state of the logic bus of said transceiver; (b) means for observing the status of said outlet; (c) means for generating at least one signal for controlling said outlet in response to the state of said logic bus of said transceiver and the status of said outlet; and (d) means including a microprocessor in communication with said logic bus of said transceiver and with said outlet, said means being arranged to identify the protocol of said transceiver and to communicate the state of said outlet in said identified protocol to said logic bus.
Claim 2
Dependent Claim
145 words
Apparatus for interfacing a standard telephone outlet with a cellular system, said cellular system being characterized by a radio transceiver adapted to communicate directly with a handset of compatible design so that audio is transmitted between said handset and a central office, said apparatus comprising, in combination: (a) means for observing the state of the logic bus of said transceiver; (b) means for observing the status of said outlet; (c) means for generating at least one signal for controlling said outlet in response to the state of said logic bus of said transceiver and the status of said outlet; and (d) means including a microprocessor in communication with said logic bus of said transceiver and with said outlet, said means being arranged to identify the protocol of said transceiver and to communicate the state of said outlet in said identified protocol to said logic bus.
Claim 3
Dependent Claim
29 words
Apparatus as defined in claim 1 further including: (a) a plurality of switches interposed between said transceiver and said handset; and (b) said switches are controlled by said microprocessor.
Claim 4
Dependent Claim
36 words
Apparatus as defined in claim 2 further including means in electrical connection with said outlet for detecting an off hook status at said outlet and for transmitting a predetermined signal to said microprocessor in response thereto.
Claim 5
Dependent Claim
28 words
Apparatus as defined in claim 3 further including means for providing a high voltage signal to said outlet in response to a predetermined signal input from said microprocessor.
Claim 6
Dependent Claim
30 words
Apparatus as defined in claim 1 further including means in electrical connection with said microprocessor for providing precision telephone signals to said outlet in response to square wave inputs therefrom.
Claim 7
Dependent Claim
24 words
Apparatus as defined in claim 5 further including means in electrical connection with said outlet for decoding both pulse and tone signalling inputs therefrom.
Claim 8
Independent Claim
120 words
A method for modifying a cellular system of the type that includes a transceiver haracterized by a predetermined equipment protocol for interfacing with a handset of compatible design so that a telephony device can communicate through said system, said method comprising the steps of: (a) observing the state of the logic bus of said transceiver; then (b) identifying the protocol of said transceiver; then (c) observing the status of said device; then (d) generating at least one signal for controlling its operation in response to the observed status of said logic bus and the observed state of said device; and (e) transmitting information onto said bus in response to the status of said device in the protocol of said transceiver.
Claim 9
Independent Claim
120 words
A method for modifying a cellular system of the type that includes a transceiver haracterized by a predetermined equipment protocol for interfacing with a handset of compatible design so that a telephony device can communicate through said system, said method comprising the steps of: (a) observing the state of the logic bus of said transceiver; then (b) identifying the protocol of said transceiver; then (c) observing the status of said device; then (d) generating at least one signal for controlling its operation in response to the observed status of said logic bus and the observed state of said device; and (e) transmitting information onto said bus in response to the status of said device in the protocol of said transceiver.
Claim 10
Dependent Claim
30 words
A method as defined in claim 7 further including the step of controlling the communication links between said handset and said transceiver in accordance with the status of said device.
Claim 11
Dependent Claim
48 words
A method as defined in claim 8 further including the steps of: (a) detecting the off hook condition of said device; then (b) generating a precision dial tone signal in response to said off hook condition; and then (c) transmitting said precision dial tone signal to said device.
Claim 12
Dependent Claim
40 words
A method as defined in claim 8 further including the steps of: (a) decoding the incoming call state of said bus; then (b) generating a high voltage signal for activating a ringer; and (c) transmitting said signal to said device.
Claim 13
Dependent Claim
37 words
A method as defined in claim 8 further including the steps of: (a) decoding the no service state of said bus; then (b) generating a precision fast busy signal; and (c) transmitting said signal to said device.
Claim 14
Dependent Claim
30 words
A method as defined in claim 7 wherein the step of observing the status of said device is further characterized by the step of decoding at least one tone signal.
Claim 15
Dependent Claim
31 words
A method as defined in claim 7 wherein the step of observing the status of said device is further characterized by the step of decoding at least one pulse coded signal.
References Cited (Backward Citations)
US4558178A
Cited
US4658096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |