声场校准周期及影响因素分析

发布时间：2018-01-26 16:17

  本文关键词： 声场 校准 影响因素　出处：《听力学及言语疾病杂志》2016年01期 　论文类型：期刊论文

【摘要】：目的初步探讨声场校准的周期及其影响因素。方法采用ISO389-7:2005及ISO8253-2:2009标准校准A、B 2个声场(扬声器方位角均为45°),A声场3个月校准一次,B声场每次使用前校准一次,分别记录各声场左右两个扬声器在250、500、1 000、2 000、3 000、4 000 Hz 6个频率的声强,并与每个频率规定的标准值(ISO8253-2:2009标准:该6个频率声强级分别为80、80、79、74.5、72、70.5dB SPL)比较;同时采用多因素方差分析,分析B声场每次校准时周围环境的温度、湿度对声场的影响。结果A声场校准时右侧扬声器250、3 000、4 000Hz测得的声强级分别为83.5±2.2、77.0±3.0、76.2±2.7dB SPL,均高于标准值(分别为t=3.15,P0.05;t=3.19,P0.05;t=4.19,P0.05);右侧扬声器其余3个频率和左侧扬声器各频率测得的声强与标准值间差异无统计学意义(P0.05)。B声场校准时右侧扬声器4 000Hz测得的声强级为71.1±1.5dB SPL,与标准值的差异有统计学意义(t=2.12,P0.05);而右侧扬声器其余5个频率及左侧扬声器所有频率与标准值的差异均无统计学意义(P0.05)。对B声场中与标准值有显著性差异的右侧扬声器4 000 Hz测得的声强与测试时声场的温度、湿度进行多因素方差分析显示,测试时温度(F=0.9,P0.05)、湿度(F=0.8,P0.05)环境因素变化对扬声器声强级变化无显著影响。结论对于频繁使用的声场,应在每次使用前进行校准;声场的温度、湿度对声场校准无影响。
[Abstract]:Objective to investigate the period of sound field calibration and its influencing factors. Methods A was calibrated by ISO389-7:2005 and ISO8253-2:2009 standard. B 2 sound fields (the loudspeaker azimuth is 45 掳/ A) sound field is calibrated once every 3 months before each use of B sound field, and each sound field is recorded at 250,500. Sound intensity of 1 000 ~ 2 000 ~ 3 000 ~ 4 000 Hz 6 frequencies. According to the standard value of each frequency, ISO 8253-2: 2009, the sound intensity levels of the six frequencies are 80 / 80 / 79 / 74.572, respectively. 70.5 dB SPLA comparison; At the same time, the influence of ambient temperature and humidity on sound field was analyzed by multifactor analysis of variance. Results the right loudspeaker was 2503 000 in A sound field calibration. The sound intensity levels measured at 4 000 Hz were 83.5 卤2.2 卤77.0 卤3.0 卤76.2 卤2.7 dB respectively, which were higher than the standard values (t = 3.15, respectively). P0.05; T (3. 19) (P0.05); Tet 4.19 (P0.05); There was no significant difference between the sound intensity measured from the other three frequencies of the right speaker and the left speaker and the standard value (P0.05). The sound intensity level measured by the right loudspeaker at 4 000 Hz is 71.1 卤1.5 dB SPL when the sound field is calibrated. The difference between the standard value and the standard value was statistically significant. There was no significant difference between the other five frequencies of the right loudspeaker and the left loudspeaker between all the frequencies and the standard value (P0.05). The sound intensity measured by the right loudspeaker at 4 000 Hz and the temperature of the sound field measured in B sound field were significantly different from the standard value. The multivariate variance analysis of humidity showed that the temperature was 0.9g P0.05g and the humidity was 0.8. P0.05) the change of environmental factors has no significant effect on the sound intensity of loudspeaker. Conclusion for the frequently used sound field, calibration should be carried out before each use. The temperature and humidity of sound field have no effect on sound field calibration.
【作者单位】： 中国聋儿康复研究中心;
【分类号】：R764
【正文快照】： hearing impaired patients clinically should be calibrated periodically.The tested factors such as temperatme and ju-midityhave no influence on the sound field.用于声场测听的准自由声场建立后需定期进行校准,与声场校准相关的国际标准分别为ISO389-7和ISO8253-2[，

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