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Computer interface unit for an audiometer

  • US 4,768,165 A
  • Filed: 09/19/1985
  • Issued: 08/30/1988
  • Est. Priority Date: 10/02/1984
  • Status: Expired due to Fees
First Claim
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1. A computer interface unit for an audiometer having a plurality of controllable audiometer modules, said interface unit permitting control of said audiometer modules by means of a computer and comprising:

  • (a) a plurality of first control lines, including both input and output lines, there being a plurality of input lines and at least one output line, the first lines being connectable to a computer and each first line having a d-c isolating coupler therein;

    (b) a plurality of decoders connected to said first lines;

    (c) a plurality of memories, each connected to one of said decoders;

    (d) a plurality of second control lines connecting said memories with said audiometer modules, whereby said audiometer modules may be controlled by said computer;

    (e) a NAND gate connected through inverters to individual ones of said input lines and without inverters to other individual ones of said input lines, said NAND gate having an output line connected via an integrator and at least one Schmitt trigger circuit to an associated one of said memories; and

    (f) an OR gate having an input connected to the line between said Schmitt triggers and an output connected to said one output line for providing a reply signal to said computer.

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