RTA 2.2 Ranking & Summary
RTA 2.2 description
A Real Time Analyzer for the iPhone and iPod Touch. Test your speakers, tune your room, do acoustical analysis work or just have fun. RTA is a professional-grade acoustical analysis tool. All filters meet or exceed ANSI and IEC specifications.
Includes Octave and 1/3 Octave modes, with selectable decay times, as well as Peak Hold and true linear Average mode.
*** NOTE FOR iPHONE 3GS USERS ***
We have determined that the microphone in this model, as well as any mic plugged into the headset connector, has a much steeper low-frequency roll-off. We have corrected for this in this update. The app will detect what phone it is running on and determine what filters to use.
*** Built-in Pink Noise Source
Also includes a built-in pink noise generator. Flip the screen over, turn on pink noise, and plug a cable into the headphone connector (use a mic splitter) to generate full-band pink noise. Pink noise is equal energy per octave, and so will appear flat on the RTA display if the system response is flat. See our web site for more information.
*** Save and Recall Graphs
You can save and recall up to ten graphs, marked with the date & time and your comment, as well as store the image to your photo roll.
*** Max and Min Bars
You can also turn on resettable Max/Min bars (see image #4) to capture peaks. Double-tap to reset the bars.
*** iPhone mic Frequency Compensation Filter
RTA uses a special frequency-compensation filter to flatten the iPhone mic. Make sure you select Internal on the setup page.
RTA is designed by the same team that built the Audio Toolbox acoustic analyzer.
*** Specifications and Devices
The internal iPhone mic has a noise floor near 30 dB, and clips around 105 dB. So, be aware that this tool will NOT work in very loud environments, such as clubs or some concerts. RTA will work on first-generation iPhone, but always use the headset mic, as the built-in mic runs at a low sample rate.
If you have an iPod Touch 2nd generation, use a headset mic, and if you have a first generation iPod Touch, you must use one of the dock-connector microphones and be running OS 2.2 or later.
*** Touch GUI
Fully interactive touch GUI features includes scroll up/down, pinch to zoom or compress the vertical dB scale, or swipe horizontally to get a cursor that reads out the exact dB level and frequency across the screen. To make the cursor disappear, swipe it off the graph to the left.
The landscape-mode display flips 180 degrees so that you can face the internal mic in either direction.
*** Overlay Curves
Also included are optional noise curve overlays, in NCB, RC, PNC, and NR mode. See picture #2 for an example. Use this feature to get a quick reading on the noise levels in a room. Also includes the cinema large-room X-curve overlay.
RTA can be calibrated, and stores two calibration constants, one for the internal mic and one for the external calibrated test microphone. We even have corrected for the iPhones intrinsic high and low-frequency roll-offs.
*** RTA or FFT?
If you are wondering if you should download this app or our FFT app, check out our website, we have a page devoted to this topic.
NOTE: I have enabled purchasing for first gen Touch, but please realize that it has no normal mic or support for a headset mic; you will have to use a 3rd party mic that uses the dock connecter, or wait for our measurement mic.
See our other acoustics and audio apps, SPL Graph, for recording SPL over time, SPL, the professional Sound Level Meter for the iPhone, ETC, the Energy Time Curve app, Generator, the iPhone signal generator, FFT, for detailed acoustic analysis, RT60, to measure decay time, and Speaker Pop, which tests speaker polarity.
Also, if you are looking for a great range of high-quality, professional, audio test equipment, check out www.sencore.com.
Requirement:Compatible with iPhone and iPod touch Requires iPhone OS 3.0 or later
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