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IMBE Tone Insertion Algorithm Disclosure Number: IPCOM000013174D
Original Publication Date: 2003-Jun-17
Included in the Prior Art Database: 2003-Jun-17

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Erik S. Perrins


This paper describes an algorithm for inserting tone frames into the IMBE encoder output stream. The algorithm works in tandem with a tone detection algorithm, and will insert IMBE tone frames based on the decisions of the detector. The algorithm takes into account the attributes of the IMBE encoder when inserting the tone frames in order to achieve the best audio quality possible. Specifically, it accounts for the delay of the encoder, and attempts to smooth out any transient effects in connection with starting and stopping the insertion of pre-defined IMBE frames.