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Acquisition and error recovery of audio data carried in a packetized data stream

  • US 5,703,877 A
  • Filed: 11/22/1995
  • Issued: 12/30/1997
  • Est. Priority Date: 11/22/1995
  • Status: Expired due to Term
First Claim
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1. A method for processing digital audio data from a packetized data stream carrying digital television information in a succession of fixed length transport packets, each of said packets including a packet identifier (PID), some of said packets containing a program clock reference (PCR) value for synchronizing a decoder system time clock (STC), and some of said packets containing a presentation time stamp (PTS) indicative of a time for commencing the output of associated data for use in reconstructing a television signal, said method comprising the steps of:

  • monitoring the PID'"'"'s for the packets carried in said data stream to detect audio packets, some of said audio packets carrying an audio PTS;

    storing audio data from the detected audio packets in a buffer for subsequent output;

    monitoring the detected audio packets to locate audio PTS'"'"'s;

    comparing a time derived from said STC with a time derived from the located audio PTS'"'"'s to determine whether said audio packets are too early to decode, too late to decode, or ready to be decoded; and

    adjusting the time at which said stored audio data is output from said buffer on an ongoing basis in response to said comparing step.

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