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Method and apparatus for notifying completion of data communication for mobile radio telephone

  • US 5,046,187 A
  • Filed: 01/31/1989
  • Issued: 09/03/1991
  • Est. Priority Date: 02/08/1985
  • Status: Expired due to Term
First Claim
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1. In a mobile radiotelephone for data communication, comprising a tone signal generating circuit for generating a dial tone, a transmitter-receiver having a speaker connected to said tone signal generating circuit, and a control circuit for controlling the general operation of said mobile radiotelephone, connected through an I/O port to a data terminal equipment, and a changeover switch for changing the connection of a circuit for the conversational mode to a communication channel to the connection of a circuit for the data communication mode to enable data communication, a method for notifying completion of data communication for a mobile radio telephone comprising steps in which:

  • (a) said control circuit maintains said circuit for the conversational mode in an off-hook state during the operation of said data terminal equipment for data communication;

    (b) said control circuit monitors the status of said data terminal equipment through said I/O port during data communication, and provides a control signal to said changeover switch upon the recognition of the completion of data communication from the detection of the change of the status of said data terminal equipment to an OFF state;

    (c) said changeover switch changes the connection of the communication channel to said circuit for the data communication mode for the connection of the communication channel to said circuit for the conversational mode upon the reception of said control signal from said control circuit;

    (d) said control circuit feeds a restoration command signal to said tone signal generating circuit after transmitting said control signal;

    (e) said tone signal generating circuit, upon the reception of said restoration command signal, feeds a tone signal of at least one audible frequency in an audible frequency band to said speaker of said transmitter-receiver while said restoration command signal is applied thereto, to notify the operator of said mobile radiotelephone of the completion of data communication; and

    (f) said control circuit places said circuit for the conversational mode in the on-hook state after sending out said restoration command signal for a predetermined time period to disconnect said mobile radiotelephone from the telephone line.

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