a Faculty of Health Sciences, National Centre for Audiology , University of Western Ontario , London , Canada.
Int J Audiol. 2019 Jul;58(7):427-433. doi: 10.1080/14992027.2019.1594415. Epub 2019 Apr 7.
Evaluation of the Sennheiser HDA 280-CL circumaural headphone for the determination of (1) equivalent threshold sound pressure levels (ETSPL) for 125-18,000 Hz.; (2) real ear attenuation (250-8000 Hz); (3) insertion loss (63-18,000 Hz); (4) frequency response (125-18,000 Hz); (5) total harmonic distortion (THD) (125-10,000 Hz); and, (6) linearity (11,200-18,000 Hz). Twenty-five normal hearing adults aged 18-25 participated in (1) and (2). (1) Hearing thresholds were measured using the Sennheiser HDA 280-CL. Frequency specific ETSPL values were calculated in an artificial ear. (2) Sound field thresholds were measured with the ears open and covered with the headphone to obtain the real ear attenuation thresholds (REAT). These values were used to determine the maximum permissible ambient noise levels (MPANL). (3) A B&K HATS mannequin recorded the output levels of a broadband pink noise with the ears open and covered with the headphones. (4, 5) The frequency response, THD and linearity were measured in an artificial ear. Values for ETSPL, REAT, MPANL, insertion loss, as well as measures of frequency response, THD and linearity are presented. The Sennheiser HDA 280-CL meets the requirements for audiometric testing and the values presented can be used for calibration.
评估森海塞尔 HDA 280-CL 耳罩式耳机，以确定：(1) 125-18000Hz 的等效阈声压级 (ETSPL)；(2) 真耳衰减 (250-8000Hz)；(3) 插入损失 (63-18000Hz)；(4) 频率响应 (125-18000Hz)；(5) 总谐波失真 (THD) (125-10000Hz)；以及 (6) 线性度 (11200-18000Hz)。25 名 18-25 岁的正常听力成年人参加了 (1) 和 (2)。(1) 使用森海塞尔 HDA 280-CL 测量听力阈值。在人工耳中计算特定频率的 ETSPL 值。(2) 打开耳朵和用耳机覆盖耳朵测量声场阈值，以获得真耳衰减阈值 (REAT)。这些值用于确定最大允许环境噪声水平 (MPANL)。(3) B&K HATS 人体模型记录了宽带粉红噪声的输出水平，耳朵打开和用耳机覆盖。(4、5) 在人工耳中测量频率响应、THD 和线性度。给出了 ETSPL、REAT、MPANL、插入损失以及频率响应、THD 和线性度的测量值。森海塞尔 HDA 280-CL 满足听力测试的要求，给出的值可用于校准。
