Gengel R W, Kupperman G L
Ear Hear. 1980 Jul-Aug;1(4):229-31. doi: 10.1097/00003446-198007000-00011.
Electroacoustic analysis of two commercially available versions of CID W-22 indicated significant differences in calibration. Measured differences in level between calibration tone and stimulus words were plus 5 to 8 dB for Technisonic recordings and plus one dB for Auditec recordings. As a consequence, the Technisonic Studios recordings were approximately 40% more intelligible than were Auditec recordings when presented to normal-hearing listeners in a background of competing speech spectrum noise in a condition where the level of the calibration tone of the respective recordings was used as the reference value to specify nominal speech-to-noise ratio.
对市售的两个版本的CID W-22进行电声分析表明，校准存在显著差异。对于Technisonic的录音，校准音与刺激词之间的测量电平差异为+5至8分贝，而Auditec的录音为+1分贝。因此，当在竞争性语音频谱噪声背景下向听力正常的听众呈现时，以各自录音校准音的电平作为参考值来指定标称信噪比的情况下，Technisonic Studios的录音比Auditec的录音清晰度高出约40%。
