Description
Android SPL, deciBel and RT60 Meter, Spectrum Analyzer, Signal Generator and Polarity Checker Audio ToolRecommended by "Sound and Vision" magazine.
Features 1/1, 1/3 & 1/6 octave RTA modes, Leq, RT60 (wideband, Octave), spectrogram, peak frequency, Fast, Medium & Slow filters, Flat & A/C Weighting, Averaging, SPL Chart Recorder, Noise Criteria, White/Pink Noise, Sine, Square, Triangle, Sweep, Ramp and Impulse signals & loudspeaker polarity checker. Frequency spectrum store & load, von Hann windowing, "Keep Screen On".
Now with ISO 1/3 Octave Calibration feature - correct for your phone's microphone response! Move the calibration discs up or down so as to obtain a flat response, and match the overall SPL to that of an external meter.
Supports Dayton Audio iMM-6 microphone calibration files.
Use: home theater, audio engineer, car audio, etc
Online manual at: https://sites.google.com/site/bofinit/audiotool
Please join the AudioTool Discussion Group to request features or report problems:
http://groups.google.com/group/audiotool-discussion-group
AudioTools's Spectrum Analyzer component uses FFT on batches of samples recorded at the microphone. Hann windowing reduces aliasing. Recorded spectra may be stored as files on the SD card, and then loaded later and displayed together with the live spectrum.
(The "Store" button will store the current live spectrum with a filename of your choice. The "Load" button brings up a list of stored spectra. One of these can be chosen, or the "Cancel" item selected to return to the main display, or the "Clear" item selected to remove the currently loaded spectrum.)
Data collection can be paused and restarted.
To hide the buttons, tap the screen. To restore them, tap again.
The deciBel meter component uses IIR filters and exponential averaging to calculate Flat, A and C weighted response at speeds of Fast, Medium and Slow.
A pair of cursors can be shown on the RTA and Chart Recorder displays: each can be moved to any position, and will display the SPL & time/frequency values measured there. Initially, both cursors are positioned mid-screen - simply drag them to a new position with the fingertip. The cursors can be turned on and off in the Menu.
The loudspeaker polarity checker can be used to check whether a loudspeaker is wired in phase: connect the AudioTool output to the speaker under test, select "Polarity" from the signal generator screen, then return to the RTA screen. If the speaker is out of phase (polarity reversed) AudioTool will show "Pol ---", otherwise "Pol +++" if the speaker is in phase.
The Noise Criteria (available from the Menu) function shows a set of NC contours overlaid on the 1/1 Octave RTA display and the calculated real time current NC value is also shown.
The Chart Recorder shows a moving trace of the SPL measurements over the last few minutes.
RT60 measurements can be made by starting the RT60 component and using a loud clap (or similar) to trigger the measurement. RT60 times measure how much reverberation or echo there is in a room or auditorium.
The Signal Generator generates White and Pink Noise, Sine, Square, Triangle and Ramp waves, and Impulses. The generator uses multiple cycled buffers that are refreshed randomly so ensuring truly random White/Pink noise. The Pink Noise algorithm uses Kemmet's method to adjust White Noise into Pink.
Frequency is set via the arrow buttons or via the keyboard.
The Impulse signal is a delta issued approximately once per second.
The accuracy in frequency of the generated periodic signals is quite good: on the Motorola Droid, errors were of the order of 1% throughout most of the range. Sine wave fidelity is good throughout most of the audio range. Other signals' leading and trailing edges show ringing and decreasing frequency response artefacts in the upper ranges.
Disclaimer: AudioTool's performance depends on your Android hardware, and is not guaranteed to meet any audio measurement or safety standards.
John
May 18, 2012 11:51:56 AM
Excellent Great tool for testing and troubleshooting paging systems and pro audio. Find ambient noise levels, feedback frequencies, and overall spl.
Sharron
May 10, 2012 5:32:02 PM
Useful audio tool I use this all the time at new venues to ring out the room and get my gear set the way I like. Worth the fee.
Foundations
Apr 17, 2012 8:04:58 PM
Perfect Definitely worth every penny, I'm using this app nearly everyday when ringing out systems. Very handy!
Markus
Apr 14, 2012 6:57:26 PM
Very good app And a very good support! Thanks a lot!
Jason
Mar 23, 2012 10:14:12 PM
Great audio app This tool is very usefull from the day to day gee wiz items to the i want my car stereo to have a flat sound response. It just works, with alot of features. Also, the support is fast and helpfull. Buy it. You wont regret.
tom devlin 3
Mar 8, 2012 1:31:39 AM
Good, but a few things... Nice once calibrated. However, having to set db range very time I open the app is very annoying. Phone does not have 125 db dynamic range; why won't it remember the range I set? Same for freq. range. Htc resound, stock android 2.3. Also, RTA animation randomly disappears, have to re start, then set it all back up again! Knocking another star off!
robert
Mar 6, 2012 5:38:56 AM
Great app. It keeps getting better.
Cozy
Mar 5, 2012 11:56:36 PM
This is the one you have been looking for Best app of its kind available!
robert
Feb 28, 2012 10:40:31 AM
great app, very responsive developer!
Ulf
Feb 26, 2012 3:33:47 PM
Excellent The best sound package I have found so far, incredably good bang for the buck compared to my B&K