免费 · 设备测试
分贝仪（声级计）.
用麦克风测量周围的噪音：实时、最大和平均分贝，带历史曲线和校准偏移。
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- Maximum
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- Average
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An estimate, not a certified sound level meter: phone and laptop microphones and their automatic processing vary a lot. Calibrate by adjusting the offset until the reading matches a real meter. The sound is analysed in your browser and never recorded or sent.
使用方法: 分贝仪（声级计）
输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。
限制与支持格式
输入内容在您的设备上处理。
英语技术说明
An estimate, not a certified meter: device microphones and their processing vary. Everything is calculated in your browser; nothing you type is uploaded.
The microphone signal is analysed in the browser: the RMS level in dB relative to full scale plus the calibration offset; echo cancellation and automatic gain are turned off when possible.
A quiet office reads around 40–50 dB and a busy street 70–80 dB after calibration.