摘要
针对音频篡改过程中重采样操作的检测,通过对插值音频信号频谱特性的分析,提出一种频谱测度即子带谱平滑度,用以度量音频信号在各子带频谱的波动程度,并提出用子带谱平滑度作音频信号篡改检测的方法及其具体实现步骤.实验结果表明,该方法不仅能够准确地检测出音频信号是否经过插值和拼接处理,还能比较准确地估算出信号插值前的原始采样率,为音频取证提供更多有用信息.
To detect resampling in audio tampering, a new spectral measure, band-partitioning spectral smoothness （BPSS）, is proposed to measure the degree of spectral fluctuation. Based on the analysis to spectral characteristics of non-interpolated and interpolated audio signals, a comprehensive strategy to detect audio interpolation and stitching with BPSS is presented. Experiment results ~how that, by using the proposed method, it can be correctly determined whether the audio signals are interpolated or stitched. Furthermore, the original sampling rates of the interpolated signals can be estimated with high accuracy. Low computational complexity enables this method to be useful in real time audio tampering detection.
出处
《应用科学学报》
EI
CAS
CSCD
北大核心
2010年第2期142-146,共5页
Journal of Applied Sciences
基金
国家自然科学基金(No.60970142)资助
关键词
音频篡改检测
插值
拼接
子带谱平滑度
audio tampering detection, interpolation, stitching, band-partitioning spectral smoothness
