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Universal hand-free system for cellular phones in combination with vehicle's audio stereo system

  • US 6,349,223 B1
  • Filed: 03/08/1999
  • Issued: 02/19/2002
  • Est. Priority Date: 03/08/1999
  • Status: Expired due to Fees
First Claim
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1. A universal hands-free system for operably interconnecting a cellular telephone selected from a plurality of types to a vehicle audio system speaker for the audible reproduction thereby of a received cellular telephone signal comprising:

  • (a) a hands-free unit including;

    (1) first circuitry for amplifying and acoustically processing the received cellular telephone signal;

    (2) second circuitry operably coupled to said first circuitry for powering and charging the cellular telephone;

    (3) an acoustic source controller coupled to said first circuitry for automatically monitoring the received cellular telephone signal for a transition thereof between a standby and an operational state, said acoustic source controller generating and maintaining a transition signal upon detection of said cellular telephone signal transition to the operational state; and

    , (4) an electronic switch coupled to said first circuitry and said acoustic source controller for selectively connecting to and disconnecting from the vehicle audio system speaker said first circuitry responsive to the detection by said acoustic source controller of said transition, said electronic switch connecting said first circuitry to the vehicle audio system responsive to said transition signal; and

    , (b) a signal cable coupled to said hands-free unit for interconnecting the selected cellular telephone thereto, said signal cable including a pair of plug connectors, one of said pair of plug connectors having an impedance control portion including at least one of a voltage division resistor or a voltage division capacitor having a predetermined value corresponding to signal levels of the selected cellular telephone;

    whereby an amplified and acoustically processed form of the received cellular telephone signal is audibly reproduced by the vehicle audio system speaker during the operational state of the cellular telephone.

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