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Response timing

  • US 9,003,471 B2
  • Filed: 03/07/2003
  • Issued: 04/07/2015
  • Est. Priority Date: 03/07/2002
  • Status: Active Grant
First Claim
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1. A method for transmitting a message in an interactive television system, comprising:

  • receiving at a receiver unit, from a video data provider, a live broadcast video stream;

    the live broadcast video stream including video data and a continuous timing stream indicative of timing of the video data, wherein the continuous timing stream has a frequency greater than 27 MHz;

    receiving at the receiver unit an instruction from a user to transmit a message from the receiver unit;

    in response to the instruction directly querying, from the continuous timing stream included in the live broadcast video stream, current timing data indicating a current time point in the video stream;

    in response to the instruction forming the message at the receiver unit;

    including in the message a timing indication based on the queried current time point and data identifying the receiver unit from which it was transmitted; and

    transmitting the message from the receiver unit.

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