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    • 9. 发明授权
    • Post-compression hidden data transport
    • 后压缩隐藏数据传输
    • US5687191A
    • 1997-11-11
    • US607330
    • 1996-02-26
    • Chong U. LeeKamran MoallemiJurg Hinderling
    • Chong U. LeeKamran MoallemiJurg Hinderling
    • G10L19/00H04B1/66H04B1/707H04L27/00H04K1/00H04L27/28
    • G10L19/018H04B1/665H04B1/707H04B2201/70715
    • Auxiliary data subband samples representing an auxiliary data signal are transported in a subband-coded compressed digital audio signal without decompressing the data. A pre-existing packetized data stream is provided to an input of a encoder. Subband audio samples are extracted from the packet stream and normalized if required. The data to be transported modulates data carrier subbands including, for example, a pseudo-noise (PN) spread spectrum signal, each subband of which has a bandwidth corresponding to those of the digital audio signal. The data carrier sequence can also include a sparse PN sequence, sample twiddle sequence, or a bit twiddle sequence. The modulated data carrier sequence is combined with the audio subband samples to form a combined signal in which the auxiliary data subband samples are carried. The combined signal is then multiplexed into the pre-existing packet stream. In a decoder, the combined signal is demodulated to recover the auxiliary data signal. The recovered auxiliary data signal is carried substantially inaudibly in the audio signal and is spectrally shaped according to the audio signal to enhance concealment.
    • 代表辅助数据信号的辅助数据子带样本在子带编码压缩数字音频信号中被传送而不解压缩数据。 将预先存在的分组数据流提供给编码器的输入。 从分组流中提取子带音频样本,并根据需要进行归一化。 要传送的数据调制数据载波子带,包括例如伪噪声(PN)扩展频谱信号,每个子带的带宽对应于数字音频信号的带宽。 数据载体序列还可以包括稀疏PN序列,样本旋转序列或位旋转序列。 调制的数据载波序列与音频子带样本组合以形成其中携带辅助数据子带样本的组合信号。 然后将组合的信号复用到预先存在的分组流中。 在解码器中,组合信号被解调以恢复辅助数据信号。 所恢复的辅助数据信号基本上无声地传送到音频信号中,并且根据音频信号进行频谱成形以增强隐藏。