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Watermark Insertion Into MP3 Bitstream Using the Linbits Characteristics

We suggest the watermarking techniques which inserts additive informations into quantized integer coefficients whose values are over 15, called linbits, during Huffman coding in MP3 encoding procedure. The linbits are inserted into the bitstream with binary codes as it is. We inserted watermarks by modifying the linbits, and made an experiment evaluating audible distortion through the MOS Test. In our experiment, 20 untrained listeners were asked to rate 20 samples of about 15 seconds in which watermark is inserted at 128kbps, according to perceived quality on a scale of 1(very annoying) to 5 (imperceptible). As a result, we confirmed that we could insert the additional informations or watermarks of about 60bytes/second with sound quality of MOS 4.6 on an average.

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