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The average direct current offset values for small digital audio recorders in an acoustically consistent environment

机译:在声学一致的环境中小型数字录音机的平均直流偏移值

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In this research project, nine small digital audio recorders were tested using five sets of 30-min recordings at all available recording modes, with consistent audio material, identical source and microphone locations, and identical acoustic environments. The averaged direct current (DC) offset values and standard deviations were measured for 30-sec and 1-, 2-, 3-, 6-, 10-, 15-, and 30-min segments. The research found an inverse association between segment lengths and the standard deviation values and that lengths beyond 30 min may not meaningfully reduce the standard deviation values. This research supports previous studies indicating that measured averaged DC offsets should only be used for exclusionary purposes in authenticity analyses and exhibit consistent values when the general acoustic environment and microphone/recorder configurations were held constant. Measured average DC offset values from exemplar recorders may not be directly comparable to those of submitted digital audio recordings without exactly duplicating the acoustic environment and microphone/recorder configurations.
机译:在此研究项目中,使用五组30分钟的录音在所有可用的录音模式下对九台小型数字录音机进行了测试,这些录音具有一致的音频材料,相同的源和麦克风位置以及相同的声学环境。测量30秒和1、2、3、6、10、15和30分钟的平均直流(DC)偏移值和标准偏差。研究发现,线段长度与标准偏差值之间存在反比关系,超过30分钟的长度可能不会有意义地减小标准偏差值。这项研究支持以前的研究,这些研究表明,测得的平均DC偏移量仅应用于真实性分析中的排他性目的,并且在一般声学环境和麦克风/录音机配置保持恒定的情况下,应显示出一致的值。在没有精确复制声学环境和麦克风/录音机配置的情况下,从示例录音机测得的平均DC偏移值可能无法与提交的数字音频录音直接比较。

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