Microprocessor controlled interface for cellular system
First Claim
1. 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.
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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.
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Citations
13 Claims
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1. 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:
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(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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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(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. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification