Pink noise has equal energy in each octave (or 1/3 octave), so in theory if your system is flat, you will see a flat line on the RTA display. RTA includes a full-featured signal generator, which includes sine waves, square waves, white noise, and pink noise.
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Turning on the generator disables Audio Monitor. Turn this on to listen to the incoming audio signal in the output. Choose unweighted SPL, or A or C weighting on the setup screen. The overall unweighted dB SPL level is shown just above the graph, on the right side. This varies somewhat by person, but even so it can be used as a guide to when sounds are not audible. This line shows the approximate level below which sounds are inaudible to the human ear. They automatically decay and will drop into the graph when there is no level above the bar. Peak decay bars will show you the actual peak level of the band, no matter what decay mode you have selected. To reset the bars, just double-tap the screen. When active, the maximum and minimum levels of each bar is stored, and shown as blue and green bars on the screen. You can turn on this option on the setup page. This means that the lower frequencies will show lower values in A or C weighting. If you select a weighting, the bars will show the weighted equivalent. None will show the actual level of each bar. Starting in RTA in AudioTools 4.0, now see the overall noise overlay curve value - in octave mode only, since the noise curve values are only defined for octave band mode. You can interpolate between curves to estimate an exact curve number. To read the noise curve value, find the lowest curve that does not have any bars touching it. To display a noise curve overlay, flip the screen over by touching the info icon in the navigation bar, and select one of the overlays: NCB - Balanced Noise Curve, RC - Room Curve, PNC, NR, or Noise Rating, used in the EU, and the cinema large-room X-curve. The image will be saved in your photo roll, and can be emailed or transferred to your computer using various third party apps. You can take a snapshot of the screen by touching the Save Image button. The level may still be panned up and down, but the range will not change and the double-tap will not change the scale or range.
You can turn on Lock Graph Scale if you want to set a graph range and not have it change on the main screen.
Double-tap the screen to auto-fit the graph to the display. You can also change the dB resolution showing on the screen by pinching - pinch together to get more dB on the screen, or pinch apart to get less vertical dB, and thus more detailed resolution. Once the graph is running, you can adjust the screen dB scale by sliding the graph and up and down. Anytime one of the parameters is changed, the RTA will revert to Pause so that the new parameters can be in effect for the most accurate readings. To reset Average mode, tap the Reset button on the screen. Even then, you can continue the average by pressing Play. This mode performs a continuous equal-weighted average, from the time you start the RTA with the Play button in this mode, until you Pause the RTA.
To reset Peak Hold, re-select Peak Hold mode. The seconds indicate the amount of time for a bar to decay by 20dB.Īlso, you can select Peak Hold, which holds the highest value that a bar has reached. You can select one of the exponential decay modes, which are labelled in seconds. To use RTA, select the band size that you want, either Octave or 1/3 Octave. Using Single-App Mode for Long-Term Noise Monitoring.Troubleshooting In-App Purchase and Standalone App Issues.Belgium, The Netherlands, and Luxembourg.LARSA - Loudspeaker And Room System Analyzer.
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