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deciBel Pro

deciBel Pro

1,000 - 5,000 downloads

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deciBel Pro is the result of a serious effort to make an Android based SPL meter as close to a professional-grade device as the phone hardware limitations allow.

It uses a Fast Fourier Transform algorithm to implement high precision A, B, C and Z weighting filters and sophisticated digital signal processing techniques to achieve the best possible SPL readings out of your Android phone or tablet.

It displays the current, maximum and minimum values in decibels, and generates 3 kinds of sound pressure level versus time charts. The display can be turned upside down to allow pointing the mic at the sound source.

### Please calibrate before the first use! ###


- true A, B, C and Z Weighting (ANSI S1.4)
- numeric dB, dBmin and dBmax display
- simple calibration interface
- Automatic Calibration function (no professional SPL meter required for reasonable startup accuracy)
- sliding sound level versus time chart
- sliding max, min and average soud level versus time chart
- accumulated sound level exposition chart (dosimeter)
- saves chart screenshots to the SD card
- dominant frequency display
- 22Khz bandwidth at the input of the weighting filter
- 1024 point real time FFT and digital sound processing

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Recently changed in this version

Notification area icon added
Performance improvements
User interface improvements

Comments and ratings for deciBel Pro
  • (67 stars)

    by Keith Wigmore on 27/09/2013

    Great tool, though the kids maxed it out at 99.9.! Though cant find the calibration menu.?? Will have to test it against my audiologist prof sound meter

  • (67 stars)

    by Charles Zorn on 11/07/2013

    Accurate and well designed. Visualization great!

  • (67 stars)

    by A Google User on 05/06/2013

    Phone locks up after first use.

  • (67 stars)

    by Gary on 04/02/2012

    Good interface , very good calibration features and user help information. Main limitation is your hardware.

  • (67 stars)

    by Peter on 22/12/2011

    I like ads free version. This is better than free version.

  • (67 stars)

    by Raiane on 22/12/2011

    Precise and adds free!

  • (67 stars)

    by Elke on 20/12/2011

    Finally true A weighting on Android!
    Works fine on my Galaxy S!