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Telecommunication device for the deaf with interrupt and pseudo-duplex capability

  • US 5,327,479 A
  • Filed: 05/20/1992
  • Issued: 07/05/1994
  • Est. Priority Date: 05/20/1992
  • Status: Expired due to Term
First Claim
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1. A telecommunication device for the deaf for communication over an analog telephone line, the device comprising:

  • a source of input data characters to be transmitted;

    a destination for received data characters;

    a microprocessor operating in accordance with a stored program code and connected to accept input data characters from the input source and to deliver data characters to the destination;

    an analog input circuit adapted to being connected to the telephone line so as to be responsive to the reception of Baudot tones over the telephone line and also connected to the microprocessor so as to provide a digital input to the microprocessor of the data received over the telephone line;

    an analog output line adapted to being connected to the telephone line so as to be capable of presenting Baudot tones over the telephone line and also connected to receive data from the microprocessor and transmit Baudot tones encoding such data over the telephone line; and

    a memory device connected to the microprocessor containing the program code for operation of the microprocessor to control operation of the microprocessor to control operation of the telecommunications device to generally(i) receive data entered from the input source;

    (ii) present entered data from the input source on the analog output line;

    (iii) receive input data from the analog input line; and

    (iv) deliver data received on the input analog line to the destination;

    the program code further constraining the microprocessor to operate in accordance with the following rules;

    (a) if any Baudot tones are being receiving on the input circuit, to not present output Baudot tones on the telephone line through the analog output line; and

    (b) during transmission, to pause after a preselected number of data characters transmitted to the test during that pause for the receipt of any Baudot tones over the analog input circuit.

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