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.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.