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Telephone device and method for operating a telephone device

  • US 4,790,002 A
  • Filed: 08/08/1986
  • Issued: 12/06/1988
  • Est. Priority Date: 08/08/1986
  • Status: Expired due to Term
First Claim
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1. Telephone apparatus for transmitting and receiving audio signals, comprising:

  • a handset having a first microphone and a first speaker;

    speakerphone means having a second microphone and a second speaker;

    hook switch means for detecting an on-hook condition of the handset and for detecting an off-hook condition of the handset;

    a speakerphone switch; and

    control means, responsive to said hook switch means and to said speakerphone switch, for successively enabling and disabling at least one of said second microphone and said second speaker in response to successive operations of said speakerphone switch during the on-hook condition; and

    wherein said control means includes means for enabling said first microphone and said first speaker in response to a change from the on-hook condition to the off-hook condition and means for enabling said second speaker in response to the operation of said speakerphone switch during the off-hook condition.

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