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Polar Pattern Plotter

Here is a fast, simple method for automated data acquisition and visualization of sound directivity, made convenient and accessible via a smartphone app

Here is a fast, simple method for automated data acquisition and visualization of sound directivity, made convenient and accessible via a smartphone app

Polar Pattern Plotter

by Scott Hawley
Polar Pattern Plotter

What is it about?

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.

Polar Pattern Plotter

App Details

Version
1.1
Rating
(1)
Size
11Mb
Genre
Utilities Music
Last updated
September 15, 2016
Release date
June 16, 2016
More info

App Store Description

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.

Instructions:
- 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_.

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