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Details
Rating

3.69/5
(108 Ratings)
Statistics


QR Code

Price
~£0.97
+/- 1.34€
+/- £1.21
+/- ¥182.95

Version
2.9.3

Downloads
1 000-5 000
Estimate :
2,298

Size
53.4 KB

Category

SPL and Spectrum Analyser

Available in :

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

V2.9: Improved stability on rotate.

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.



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 !
|||||Email



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 Christopher the 12/5/2010

Finally got my dB meter put to calibrate and found this dB meter doesn't move after calibration... terrible app. -EVO

by Dennis the 11/20/2010

Awesome

by mwilliam13 the 11/11/2010

I really found this helpful as a sound engineer, finding rouge frequencies, problematic drones, etc.. Can I request logging for future in XML or CSV?

by Dave the 9/20/2010

Slow graphics on samsung Epic (2.1). Totally sucked. Uninstalling.

by Pragmatic the 9/18/2010

Droid 2.1. Worked great and helped me track down and fix noise in cpu. Great fun to play around w too. Have lowered inside house noise SPL by 7 db!

by nicknomo the 9/18/2010

Did not measure accurately on epic 4g... I could not get it to register anything more than a ten db change, no matter what I calibrated it to.

by Nate the 9/18/2010

Works ok...but only goes to 109db -which isnt that loud

by Chuck the 9/16/2010

Good update. Works good on Eris with OS 2.1

by Scott the 9/12/2010

Thanks for the rotate fix! Epic response time.

by Iurie the 9/6/2010

Cool. Allowed me to adjust peaks with my sub equalizer.

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


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