Evaluation of the Average DC Offset Values for Nine Small Digital Audio Recorders

被引：0

作者：

Koenig, Bruce E. ^{[1
]}

Lacey, Douglas S. ^{[1
]}

Grigoras, Catalin ^{[2
]}

Price, Suzana Gallc ^{[1
]}

Smith, Jeff M. ^{[2
]}

机构：

[1] BEK TEK LLC, Clifton, VA USA

[2] Univ Colorado, Nat Ctr Media Forens, Denver, CO 80202 USA

来源：

JOURNAL OF THE AUDIO ENGINEERING SOCIETY | 2013年 / 61卷 / 06期

关键词：

FORENSIC AUTHENTICATION; RECORDINGS;

D O I：

暂无

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

The average DC offset values of recordings produced on nine small digital audio recorders were evaluated to determine if they demonstrated characteristics meaningful for forensic audio authenticity examinations when submitted audio files are compared with test recordings made using exemplar digital recorders. Five audio formats (PCM WAV, ADPCM WAV, MP3, WMA, and DSS) were tested with no input, using the internal microphone(s), and with two Olympus external microphones. The average DC offset values were calculated using sound editing, digital analysis, and scientific computing programs. Based on the standard deviations of the DC offsets in these recordings, their wide variation and inconsistency probably preclude meaningful comparisons between one-minute submitted digital audio recordings and exemplars in authenticity examinations.

引用

页码：439 / 448

页数：10

共 3 条

[1] Evaluation of the average DC offset values for nine small digital audio recorders
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