Re-built for iOS14.
New display options.

Recording of noise floor added as an additional feature enabled by in-app purchase, and for all SPLnFFT owners. Less ads.

Recording of noise floor added as an additional feature enabled by in-app purchase, and for all SPLnFFT owners

Recording of noise floor added as an additional feature enabled by in-app purchase

Optimised for latest iPhone (11) and iOS (13)

Bug correction: storing graphic to own photo library was not working well due to default applied restrictions

Some ads appear from version 3.5 but current users should not worry: 'buy' the new in-app purchase option (which is free right now) and they will disappear.
So go to 'i' page top right, select 'Get advanced features' and then 'buy' the option.

Some ads will appear from now but current users should not worry: 'buy' the new in-app purchase option (which is free right now) and they will disappear.
So go to 'i' page top right, select 'Get advanced features' and then 'buy' the option.

Minor update. Re-compiled with latest iOS

Minor update. Re-compiled for latest iOS.

Resolution increased in the very low frequencies.

Updated to support natively latest architectures (arm64)

Completely re-invented to cope with latest iOS and to focus on basic feature: measure frequency response of speakers the easiest way as possible

Updated with latest iOS, which makes it possible to bypass internal built-in low pass filter when using iPhone and iOS6

Compiled with latest iOS

Ready for iPhone4
The display can be flipped upside-down
Something was wrong with the compensation slider. This is now corrected
Alignement of FFT with power level was improved

Built for iOS4.
No other changes.
If you do not have iOS4 then yo do not need this update.

Now pictures are inserted in the mail. The mail button itself is disabled when the application is busy either producing or recording or processing data.
Updated wrt audio buffer, which improves reactivity and reduces slightly the duration of the measurements with sweep (thus no impact on measurement time with white noise).

Previous version introduced an offset of 9dB on results for measurements with white noise source. This is corrected now (see new sample images).
Info buttons were slightly modified to be more sensitive.

Processing of white noise signal was deeply re-considered.
A real time FFT was added for that purpose.
Although the overall processing time was increased, a first result is available immediately thanks to this real time FFT.
An averaging process is done to smooth the response.
As a result, the quality of the response to white noise is much improved. Other ways of measurement are not impacted.
Additional modification: the screen keeps active.

Main improvement: measurement results can be automatically saved and recalled. Check button "SAVE" in third tab for this purpose. That way, no more data lost during a phone call.
Other changes: new logo, CPU load reduced, the two values VOLume and COMPensation are now non-volatile, OS 3.1.3 used for compilation