录音资料真实性鉴定的频谱检验技术研究  

Application of Spectrum Analysis to Verify the Authenticity of Recorded Audio Data

作　　者：申小虎[1] 金恬[2] 张长珍[1] 万荣春[1] 

机构地区：[1]江苏警官学院刑事科学技术系,南京210031 [2]江苏省公安厅物证鉴定中心,南京210031

出　　处：《刑事技术》2017年第3期173-177,共5页Forensic Science and Technology

基　　金：江苏省重点学科建设专项经费资助项目(No.20110838);江苏省"青蓝工程"资助项目(No.2017QLP);江苏警官学院教改课题(No.2016B04)

摘　　要：目的研究无数字水印技术的数字音频文件篡改手段以及找到对语音样本进行鉴定的频谱分析方法和规律。方法分析研究数字音频文件篡改方法的基本原理,使用专业语音分析系统软件的平均频谱分析、区域平均频谱对比、采样直方图分析、DC偏移检验、相位分析、采样一致点分析等频谱分析功能对篡改后的音频文件进行分析并找到规律。结果针对音频文件的剪辑、拉伸、采样率转码、变频等篡改手段,可选择上述相应频谱分析方法找到篡改痕迹。结论频谱分析方法可作为录音资料真实性鉴定的有效检验手段。Objective To verify the ploys by which non-digital-watermarking digital audio files are tampered so as to discover the methods and rules to identify forensic audio samples through analysis of frequency spectrums. Methods The fundamental principle of how to tamper digital audio files was researched with technical analyses of average spectrum, regional average spectrum, sampling histogram, DC offset, phase analysis, coincident sampling points, those presently-used choices in the speech analysis system. The tampered audio files were analyzed to disclose the tampering traces. Results For the audio files transformed by editing, stretching, transcoding the sampling rate, converting frequency and other means, the tampering traces can be effectively found by the proposed methods. Conclusion The spectrum analysis can be used as an effective method for authenticity verification of recorded data.

关 键 词：录音资料 真实性鉴定 频谱检验 

分 类 号：DF793.2[政治法律—诉讼法学]