1.什么是声压级？
声压级代表的是环境噪声大小的污染水平，单位为分贝（dB），数值越大表示噪声污染等级越高。
2.如何测量声压级？
点击“开始”即可进行实时噪声测量。因噪声是实时变动的，要想知道当前噪声的大小，需要用一段时间内的等效连续声压级来表示。点击“评价”按钮，完成评价或退出评价过程后所显示的声压级即为评价时段内的等效连续声压级，声压级上部将出现“等效”标识。
3.为什么要采用A声级来进行测量？
A声级是指通过A计权修正过的声压级。由于人耳对不同频率的声音的主观感受是不一样的，A计权能够更好的反应人耳对噪声污染的感受。
4.为什么要对声环境进行评价？
因为声环境质量与其所在的周边环境和人的主观感受密切相关。
5.如何选取听到的声音？
根据听到的声音点击弹框中声源的名称即可。可以上下滑动查看更多声源。
6.评价中声音的大小是指什么？
声音的大小指用户主观受到的声音的大小程度。
7.评价中声音的舒适度是指什么？
声音的舒适度是指周边环境的声音让用户感受的舒适程度。
8.评价中声音的协调度是指什么？
声音的协调度是指周边环境与当前用户听到的声音的协调程度，例如，在车流量大的城市主干道上，尽管很吵闹，但却非常协调。
9.为何要将测量结果分享给科学家?
噪声污染具有瞬时性、时空差异性、与人的主观感受相关的特点。通过将测量结果分享给科学家能够为科学研究提供大量的数据，减少人力物力的投入，促进城市声环境的研究。
10.哪些数据被分享给了科学家？
Android平台：设备（手机）IMEI号、设备（手机）型号、测量时间、经纬度、声压级、主观评价结果。IOS平台：设备（手机）识别号、测量时间、经纬度、声压级、主观评价结果。
11.分享的数据会泄露个人隐私么？
当然不会。用户的个人隐私是安全的。应用收集的是匿名数据，不会泄露与用户有关的任何隐私信息。
12.分享的数据会占用很多流量么？
分享的数据只是测量结果，每次分享数据所花费的流量和打开一个正常网页所需要的流量差不多，甚至更少。
13.如何对噪声计测量结果进行校准？
噪声计是进行初步校准过的。若你身边具有专业的噪声仪，在进行对比后，可以在设置界面中输入校准值进行噪声的校准。
14.其他问题？
如果您还有其他问题，请发邮件至 lcmgood@163.com 或 cmli@iue.ac.cn，我们将及时为您解答。
1.What is the sound pressure level?
The sound pressure level (SPL) representatives the level of environmental noise pollution (dB). The higher value means higher noise pollution level.
2.How to measure the SPL?
To measure noise in real time, just click on the "start". Because of the fluctuation of noise, the equivalent continuous SPL is used to represent the noise level during a period. Click on the "evaluate" button, until complete the evaluation, or quit the evaluation process, the value of SPL on the screen is the equivalent continuous SPL during the evaluation period, meanwhile the "equivalent" will be displayed on the top of the SPL.
3.Why use A-weighted sound level for measurement?
A-weighted sound level is modified by A-Weighting filter. Since Human hearing does not have a flat spectral sensitivity relative to frequency versus amplitude. A-weighting filter is better respond the human hearing to noise pollution.
4. Why evaluate sound environment?
The quality of sound environment is closely related to its surroundings and people's subjective feelings.
5.How to choose sound sources?
Click the name of sound that you are hearing. Slide up and down to find more sound sources.
6.What is the sound level in the evaluation?
The sound level is degree of the user’s subjective feeling on sound volume level.
7.What is sound comfort in the evaluation?
sound comfort level is the degree of user’s comfort level to the surroundings.
8.What is harmonious level in the evaluation?
Harmonious level is the degree of harmonious between sound and environment. For example, the main road with heavy traffic, although it is very noisy, the harmonious level is very high.
9.Why do we need to share the results with scientists?
Noise pollution is timely, spatio-temportal variation, and associated with the human feelings. The sharing results can provide large amount of data for scientific research, reduce the cost of collecting data, and promote the research on urban sound environment.
10.What data will be shared with scientists?
Android platform: device’s (mobile phone) IMEI, device’s model, measuring time, longitude, latitude, SPL and evaluation results.
IOS platform: device’s (mobile phone) identification number, measuring time, longitude, latitude, SPL and evaluation results.
11.Whether the sharing data would leak the user’s privacy or not?
Of course not. The use’s privacy is safe. The data collected by SPLMeter are anonymous data, which will not leak any user’s privacy.
12.If shared data will cost much of network flow?
The shared data are just the results. Every time the network flow of the shared data cost same as the required to open a normal webpage, or even less.
13.How to calibrate the measurement result?
SPL Meter had been simply calibrated. If you have a professional noise level meter, you can also input the calibrated value in the Settings page.
14.Any other questions？
If you have any other questions, please don't be hesitated to contact us. Email: lcmgood@163.com, or cmli@iue.ac.cn
