Radio-telephone communication system

• US 3,912,875 A
• Filed: 04/03/1972
• Issued: 10/14/1975
• Est. Priority Date: 04/03/1972
• Status: Expired due to Term

• Current Assignee: Paul Katz
• Original Assignee: Paul Katz
• Inventors: Katz, Paul
• Primary Examiner(s): Claffy, Kathleen H.
• Assistant Examiner(s): Brigance, Gerald L.
• Application Number:
  US05/402,638
• Time in Patent Office: 1,289 Days
• Field of Search: 179/41A,2A,2B 325/55,37,392,64
• US Class Current: 455/462
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

A remote telephone communication system having a base station connected with a telephone switching system for automatically establishing a radio communication link between a remote station and selected telephones of the telephone switching system. The base station automatically connects its radio transmitter and receiver with the telephone switching system in response to reception of an initiate signal from the remote station or reception of a ring signal from the telephone switching system, simulates dialing to the telephone switching system in response to dial pulses transmitted by the remote station and terminates the call connection in response to reception of a second occurrence of the initiate signal. The remote radio station is provided with means for generating an initiate signal and dial signal pulse so that a remote operator may place a call directly to a preselected telephone. Signals received at the remote station from a calling telephone are utilized to provide an indication of an incoming call and to inhibit generation of the initiate signal upon answering the call.

Claims

1. In a base station connectable with a telephone system for providing radio communication between a telephone of the telephone system and a remote station having means for transmitting an initiate signal, a circuit for controlling the connection between the telephone system and the base station, comprising:

means for receiving the initiate signal;

detection means for detecting reception of the initiate signal;

switch means having a first state in which communication may be established between a telephone and the remote station and a second state in which communication between a telephone and the remote station is broken;

means responsive to each detection of said initiate signal for switching said switch means to its second state, when in its first state, and switching said switch means to its first state, when in its second state; and

means responsive to a ring signal generated by said telephone switching system for switching said switch means from its second state to its first state.

2. In a radio-telephone communication system having a base station connected with a telephone system for transmitting on a carrier wave audio information from a telephone of the telephone switching system to a remote station upon receiving an incoming call from said telephone, said base station initially transmitting an unmodulated carrier wave in response to an incoming call, a means at the remote station for providing an indication of an incoming call from said telephone, comprising:

an indicator;

means for developing a signal in response to reception of said unmodulated carrier wave; and

means for activating said indicator to provide an indication of an incoming call in response to development of said signal.

3. A radio-telephone communication system, comprising:

a remote radio station having means for transmission of an initiate signal;

a base station connectable with a telephone switching system for establishing radio communication with a telephone of the telephone system and the remote station, said base station including a normally inoperative radio transmitter connectable with the telephone system, a receiver for receiving voice and initiate signals from the remote station, switch means having a first state in which the transmitter is rendered operative and connected with the telephone system to transmit voice signals from the telephone system to the remote station and a second state in which said transmitter is rendered inoperative and disconnected from the telephone system, means for detecting reception of said initiate signal, and means for detecting a ring signal from the telephone switching system;

switch control means including means responsive to each detection of said initiate signal to switch said switch means, when in its second state, to its first state and to switch said switch means when in its first state, to its second state, and means responsive to detection of said ring signal to switch said switch means, when in its second state, to its first state.

4. A radio-telephone communication system, comprising:

a remote radio station having means for transmission of an initiate signal;

a base station connectable with a telephone switching system for establishing radio communication with a telephone of the telephone system and the remote station, said base station including a normally inoperative radio transmitter connectable with the telephone system, a receiver for receiving voice and initiate signals from the remote station, switch means having a first state in which the transmitter is rendered operative and connected with the telephone system to transmit voice signals from the telephone system to the remote station, said radio transmitter, upon being rendered operative, trAnsmitting a carrier signal to said remote station, and a second state in which said transmitter is rendered inoperative and disconnected from the telephone system, means for detecting reception of said initiate signal; and

switch control means responsive to each detection of said initiate signal to switch said switch means, when in its second state, to its first state and to switch said switch means, when in its first state, to its second state, said remote station including means for detecting said carrier signal, and means responsive to detection of said carrier signal to disable said initiate signal transmission means from transmitting said initiate signal.

5. The radio-telephone communication system of claim 4 in which said disable means disables said initiate transmission means for a preselected time period.

6. A radio-telephone communication system, comprising:

a remote radio station having means for transmission of an initiate signal;

a base station connectable with a telephone switching system for establishing radio communication with a telephone of the telephone system and the remote station, said base station including a normally inoperative radio transmitter connectable with the telephone system, a receiver for receiving voice and initiate signals from the remote station, switch means having a first state in which the transmitter is rendered operative and connected with the telephone system to transmit voice signals from the telephone system to the remote station and a second state in which said transmitter is rendered inoperative and disconnected from the telephone system, means for detecting reception of said initiate signal; and

switch control means responsive to each detection of said initiate signal to switch said switch means, when in its second state, to its first state and to switch said switch means, when in its first state, to its second state, said remote station including a master-extension circuit with a cradle switch which is activated both in placing and answering a call at the master-extension circuit, and a slave-extension circuit with a cradle switch which is activated both in placing and answering a call from the slave-extension circuit, means responsive to activation of either cradle switch for transmitting an initiate signal, means responsive to both placing and answering a call at either one of said extension circuits for disabling said initiate signal transmitting means from transmitting said initiate signal in response to activation of the cradle switch at the other extension circuit.