Re-compiled for latest iOS. Better handling of various screen sizes and shapes.

Re-compiled for latest iOS. Better handling of various screen sizes and shapes.

Optimized for latest iPhone (11) and iOS (13).
Note that natively iPhone 11 does NOT support upside down mode (same for all Apps: Safari,...).

Re-compiled with latest iOS

Minor update.
iPad users will probably be invited to re-run the 'SET' procedure, when available.

Few minor improvements, including a bug correction: in very particular conditions the 'SET' procedure (relative calibration) applied to an external microphone may have failed. No such issue detected with internal microphone. Users with external microphones should re-run this procedure.

Major update that improves by the way accuracy in higher range of measurement. A new procedure appears, to align internal gains: the 'SET' procedure. Just go to Mic. tab, select 'SET' when available (depending on device type), and follow instructions. It will generate a beep that will last few seconds thus find a quiet room first. Fortunately this procedure is to be run only once.
From now logSPL can be seen as a derivative of SPLnFFT. Both Apps will share the same core, with this difference: SPLnFFT is a full featured sound level meter targeting advanced users whereas logSPL is designed to be simple to use, for standard usage, yet with the same accuracy.
Note: click on the text to change displayed data and information

Updated to support natively latest architectures (arm64). No change expected from user's point of view

Major update for recent iPads: new offset applied. Before this modification measurements with internal microphone were over-estimated of 10dB on this type of device. No change for iPhones.
Any issue regarding installation or any other topic ? Contact me by mail: I cannot answer to comments in iTunes.

Minor update for compatibility with latest iOS release

_ user interface slightly improved thanks to bigger controls
_ now you can read directly the value of current level by tapping the historical view

New icons

Migration to iOS7

Major update with regards to A/C/Z weightings

Fine tuning of pre-calibration values
Hysteris increased to switch from LOW to HIGH sensitivities
Improved robustness when using an external microphone

Dosemetering feature did not handle correctly the Threshold parameter. It is now corrected.

Minor graphical bug removed

Smart update: gain of microphone can now be forced to low or high, when measurement mode is available (iPhone and iOS5 or above)

Updated with latest iOS. Optimized for iPhone 5

Major update:
* added a pause button
* added an histogram
* it can compute L%: L95, L50, ...
* added this feature: dosemeter

Optimized for retina displays: iPhone 4/4S, new iPad

Some minor cosmetic changes. Reset is simplified

A & C weightings curves were modified to be more accurate

The upper window can now be scrolled left-right to display results using other scales. When 'dBr' is mentioned, then results are displayed relative to average value (thus average itself is 0 in these views). Currently 4 views are proposed.
Useful range is extended for some devices when used with iOS5.

Some cosmetic changes that should improve even more ease-of-use.
One additional feature: weighting of type Z is added on top of existing ones: A and C.
The blue line disappears since it can create confusion.
Optimization of CPU power for an iPhone 3GS.