| 摘要 |
Disclosed herein are an audio encoding/decoding apparatus having a watermark insertion/abstraction function capable of inserting/abstracting watermark information into/from a bit stream in a digital audio and image encoding process, and a method using the same. The high sound-quality audio encoding apparatus includes: a bit allocation unit for allocating a bit to each sub-band using an SMR (Signal to Mask Ratio) value of each sub-band in an inputted audio signal; a quantization unit for quantizing each sub-band sample in the inputted audio signal according to the number of bits allocated through the bit allocation unit; a watermark insertion unit for inserting watermark data in a location of the quantized sub-band sample in the sub-band in which the bit is not allocated, and encoding the watermark-inserted sub-band sample; and a bit stream generation unit for converting the quantized sub-band sample, the watermark-inserted sub-band sample, scale factor information and bit allocation information into a format of an audio bit stream, and transmitting the format-converted audio bit stream.
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