Method of inserting additional data into a compressed signal
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United States of America Patent
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Mar 18, 2008
Grant Date -
Jun 17, 2004
app pub date -
Feb 8, 2002
filing date -
Feb 9, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Many compressed audio or video frames contain silence (if audio), or a blank image (if video); these essentially information content free (e.g. silent if audio or blank if video) frames can be both detected whilst still in compressed form and then used to carry the additional data. In an MPEG implementation, subbands associated with silent frames are rendered digitally silent and then used to carry PAD (Programme Associated Data).
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