Method of inserting additional data into a compressed signal

Details Method of inserting additional data into a compressed signal Method of inserting additional data into a compressed signal

2002-02-08

2008-03-18

Azad, Abul K. (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

With content reduction encoding

C704S200100

Reexamination Certificate

active

07346517

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).

REFERENCES:
patent: 6532445 (2003-03-01), Toguri et al.
patent: 6678657 (2004-01-01), Bruckner et al.
patent: 6901368 (2005-05-01), Ono

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