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(108 Ratings)

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+/- 1.34€
+/- £1.21
+/- ¥182.95


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SPL and Spectrum Analyser

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Description provided by the Developer

SPLMeter monitors sound picked up by the mic on your Android device and converts it to an SPL in deciBels, as well as showing its frequency composition as a spectrum. The meter has three speeds: Fast, Medium and Slow. Peak spectrum can be shown as well as the detected frequency of maximum strength, in Hz.

Operation Details
Input audio data from the microphone is read out as 16 bit PCM samples at a sample rate of 22,050 samples per second. This sets the maximum detectable SPL level to 90dB (equivalent to 20log(65536)), and the maximum detectable frequency to around 10kHz.

A calibration adjustment is made internally that matches the dB SPL shown by SPLMeter to that measured by the Ivie Technologies IE35 professional grade meter. Metering uses an exponential filter whose speed can be adjusted to Slow, Medium or Fast using a button on screen.

The PCM samples are sent to a FFT in batches of 2048 ... this fixes the lowest detectable frequency to around 10Hz. The frequuency spectrum is plotted on a Hz log scale in the standard way, with dB levels shown on the vertical axis for each point.

The frequency at which the maximum value of SPL is detected is shown on the display, and its position indicated with a small downwards pointing arrow.

The application also shows the real time audio PCM signals as they are collected from the Mic via the Android device's audio subsystem. These are plotted on the lower display from left to right, as a function of time. This display auto scales as a function of the maximum detected signal level.

Buttons are provided that allow the display to be paused and to show or hide the peak measured spectrum.

If the mic signals clip due to overload (very loud noise) then the Mic sample display background changes to red.

Processing Speed
The number shown immediately after the "Mic" legend indicates the frame rate of the application, in milliseconds - in other words the time for data collection and processing ... ideally, at the chosen sample rate, this should be around 200ms, but will vary depending on the speed of the Android device's processor and whether other applications are taking shares of the CPU. On the Motorola Droid it runs at around 250ms, on the HTC G1 it is slower, around 800ms.

Description from the Market

SPLMeter shows SPL (deciBels) of the Android's mic signals, and their frequency spectrum. The meter has three speeds: Fast, Medium and Slow. Shows peak envelope and frequency of maximum intensity, and clipping. ISO 1/3 Octave bars and Spectrogram.

(If you need a more fully featured RTA, with 1/1, 1/3 and 1/6 octave display, RT60, Noise Criteria, A&C Weighting etc. combined with a signal generator, please take a look at my "AudioTool" app in Android Market.)

iPhone related for SPL and Spectrum Analyser

SPL and Spectrum Analyser was developed for Android by jjbunn

Package name : com.julian.apps.SPLMeter

System permissions : 2 Click here to show/hide list
  • android.permission.RECORD_AUDIO
  • android.permission.MODIFY_AUDIO_SETTINGS

I am the developer of this Application !

Screenshot(s) available for SPL and Spectrum Analyser

Discussion(s) about SPL and Spectrum Analyser in our forum

Comments and Ratings for SPL and Spectrum Analyser

Filters :
by A Google User the 10/8/2012

You get what you pay for Did the job well. Not perfect but solid for a backup to a real one.

by A Google User the 5/12/2012

Samsung blaze Great app...

by A Google User the 4/29/2012


by A Google User the 3/7/2012

Lame Doesn't go above 80db

by A Google User the 1/18/2012

Droid Razr Doesn't work on the Razr... Just displays a white noise kinda wave. Input didn't seem to affect it

by A Google User the 12/31/2011

Perfect on Bionic. Awesome!! Very accurate and useful! Used it to tune the room in a $100k home theater yesterday. Great app.

by A Google User the 11/6/2011

Great app! A bit choppy at times on my Droid X, but no surprise there. Keep in mind that this app is limited only by the hardware it's running on... a cell phone

by A Google User the 9/4/2011

Useful Handy for ringing out a room before a gig or for finding which frequency to hit when feedback occurs.

by A Google User the 5/5/2011

App should keep screen on

by A Google User the 3/27/2011

Simply broken -- frequency off by about 20 Hz This is a very nifty app, except it doesn't work. Comparing it against a pure tone of 440 Hz, it reads 420 Hz as the peak. It's consistently about 20 Hz too low. If the frequency were correct, it'd be a great app. Until that's fixed, stay away.

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SPL and Spectrum Analyser for Android was rated by Android Market Users on : 3.7/5


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