iPhone Screenshots


Here is a fast, simple method for automated data acquisition and visualization of sound directivity, made convenient and accessible via a smartphone app. The app synchronizes measurements of sound volume with the phone's angular orientation obtained from either compass, gyroscope or accelerometer sensors and produces a graph and exportable data file. It is generalizable to various sound sources and receivers via the use of an input-jack-adaptor to supplant the smartphone's (omnidirectional) microphone. Results are fully adequate for introductory electro-acoustics experiments and demos.

- For horizontal rotations, select either the Compass or Gyroscope ("Gyro: Yaw", preferred) settings. For vertical rotations, use "Accel: Gravity."
- A "VU meter" bar is provided to check the input level
- When you press Start, the plot will begin at an angle of "0", which is assumed to be straight-on toward the center of the sound source.
- After pressing "Stop", you can adjust the dB value at the origin by moving the "dbMin" slider at the bottom of the screen.
- Using iTunes File Sharing, a .CSV file called "data.csv" is available, which includes a dump of the recent measurements, for use in exporting to other graphing & analysis programs, e.g. Excel.

Example measurements and further discussion will be available in a journal paper under submission with _The_Physics_Teacher_.

What’s New

Version 1.1

Extended frequency response to 20 kHz. (v1.0 rolled off around 5kHz.)

Ratings and Reviews

5.0 out of 5
1 Rating
1 Rating
Picky About Music ,

I love it.

So many uses for a musician and sound tech.


Scott Hawley
12.5 MB

Requires iOS 8.1 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© (c) 2016 Scott Hawley


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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