SPL Meter

Sound Pressure Level Meter. This app uses the microphone to detect sound and convert it into an SPL value. FOR INDICATION ONLY. Results depend on your device and its hardware. The range between the noise floor and saturation may be only 20 dB on the worst devices, but could exceed 100 dB on the best devices.

Features of this SPL meter include:

Analogue Dial with Max and Min indicators.

Weighting – A, C or None . (A weighting filters the high and low frequencies according to how the ear perceives sound loudness). Results are in dB, dBA or dBC depending on weighting.

Averaging of SPL, Clear and Pause buttons.

Octaves and third octaves - Frequency spectrum of the sound.

Graph – Shows the time depedence of the sound.

Autoscale or manual (pinch & pan) Y-Axis.

Relative button – if looking for differences, tapping REL will remove the current averaged value from the reading.

Calibrate option – If you have a calibrated SPL meter or known loudness source, you can use this option to calibrate the meter. (However its still for Indication Only).

More technical details can be found on the website.

声压级计。该应用程序使用的麦克风来检测声音，并把它转换成一个SPL值。 FOR仅指示。结果取决于您的设备和硬件上。本底噪声和饱和之间的范围内可以仅20分贝上最差的设备，但可能超过100分贝的最佳设备。

这SPL计的特性包括：

模拟表盘与最大和最小的指标。

权重 - A，C或无。 （根据如何耳感知声音响度加权滤波器的高频和低频）。结果以dB（分贝）或DBC取决于权重。

平均SPL的，清晰和暂停按钮。

八度，第三个八度 - 声音的频谱。

图表 - 显示声音的时间depedence。

自动缩放或手动（捏和平移）Y轴。

相对的按钮 - 如果寻找差异，攻丝REL将删除读当前平均值。

校准选项 - 如果你有一个校准SPL米或已知的响度源，您可以使用此选项来校准仪表。 （但是它仍然是仅指示）。

更多的技术细节可以在网站上找到。