Audio encoding/decoding apparatus having watermark insertion/abstraction function and method using the same

Abstract

The invention discloses an audio encoding / decoding device and a method thereof, which have watermark insertion / extraction functions, and can insert / extract watermark information into / from bit streams during digital audio and image encoding. This high-quality audio coding device includes: a bit allocation unit, which uses the SMR (signal-masking ratio) value of each sub-band in the input audio signal to allocate bits to each sub-band; to quantize each subband sample of the input audio signal; a watermark insertion unit for inserting watermark data in the position of the quantized subband sample of the subband to which no bit is allocated, and to encode the subband sample for inserting the watermark; and a bit stream generation unit , for converting quantized sub-band samples, watermark-inserted sub-band samples, scale factor information, and bit allocation information into an audio bitstream format, and transmitting the format-converted audio bitstream.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2004-0095120 filed on November 19, 2004, which is incorporated herein by reference in its entirety. technical field [0002] The present invention relates to the digital watermark technology in the data hiding method, in particular to an audio encoding / decoding device and its method which have watermark inserting / extracting functions and can insert / extract watermark information. Background technique [0003] Generally, watermarking involves embedding secret information called a "watermark" into media such as video, images, audio, and text. Extraction of embedded watermark information is limited to those who know it. The average user cannot distinguish watermarked media from normal media. [0004] In particular, digital media brings new issues of copyright protection, due to the advantages of digital media over analog media, such as easy access, transmission, editing and storage, and data distribu...

AI Technical Summary

Problems solved by technology

On the contrary, the disadvantage of the spread spectrum communication method is that the sound quality is deteriorated, the insertion and extraction are computationally intensive, and the compression coding is incomplete when the watermark is high in strength to improve robustness

[0019] Similarly, to summarize the existing audio watermarking technology, its disadvantage is that its implementation method is complicated, because the watermark information is usually inserted into the original signal before the original signal is compressed and decoded, and therefore it has a large amount of calculation and the original signal is compressed when it is compressed easily transformed

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