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Communication protocol between a communication device and an external accessory

  • US 6,330,247 B1
  • Filed: 02/08/1999
  • Issued: 12/11/2001
  • Est. Priority Date: 02/08/1999
  • Status: Expired due to Term
First Claim
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1. A method of communicating both voice and control data between a communication device and an external accessory over a data bus, the method comprising the steps of:

  • formatting a sequence of bits into a repeating sequence of first time slots and second time slots;

    transmitting said voice data in said first time slots;

    transmitting redundant control data in said second time slots;

    wherein a first bit of each of said second time slots comprises a clock bit that alternates between a high value and a low value as between consecutive second time slots.

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