AudioTool 8.6.2

jjbunn – Commercial – Android
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The SPL (deciBel) Meter offers a comprehensive suite of features tailored for audio professionals, including RT60, Leq, Sone measurements, Spectrum Analyzer, Spectrogram, Chart Recorder, Signal Generator, Polarity Checker, and Microphone calibration.

Endorsed by "Sound and Vision" magazine and well-received by audio engineers globally, the tool is designed to assist in various applications such as gig measurements, home theaters, and acoustic assessments.

Key Features:
<ul>
 <li>1/1, 1/3, 1/6 &amp; 1/12 octave RTA modes</li>
 <li>Leq (wideband, Octave, variable duration)</li>
 <li>Sones (Loudness)</li>
 <li>RT60 (wideband, Octave)</li>
 <li>Peak Store</li>
 <li>Spectrogram</li>
 <li>Waterfall</li>
 <li>Peak frequency detection</li>
 <li>Impulse responses with Fast, Medium &amp; Slow filters</li>
 <li>Flat &amp; A/C Weighting and film industry X Curve</li>
 <li>Averaging calculations</li>
 <li>SPL Chart Recorder</li>
 <li>Noise Criteria (NC and NR)</li>
 <li>Signal generation: White/Pink Noise, Sine, Square, Triangle, Sweep, Log Sweep, Warble, Ramp and Impulse signals</li>
 <li>Loudspeaker polarity checker</li>
 <li>RTA Store &amp; Load feature</li>
 <li>User-friendly interface with pinch to zoom and scroll to center capabilities</li>
</ul>

Recent Updates (as of April 2019):
<ul>
 <li>v8.0: New feature allowing the loading of one or two stored spectrum files for side-by-side comparison with real-time data.</li>
 <li>v8.1: Added generator option to swap the phase of the Right stereo signal.</li>
 <li>v8.2: New menu option "Set Resolution" which allows selection of sample lengths—4096, 8192, or 16384.</li>
 <li>v8.3: Introduction of a new 1/12 Octave RTA mode.</li>
</ul>

A unique feature is the exclusive ISO 1/3 Octave Calibration which adjusts for microphone response inaccuracies. This calibration process allows users to achieve a flat response and synchronize SPL readings with external meters while supporting popular microphones such as the Dayton Audio iMM-6 and MicW i436.

The application incorporates advanced functionalities such as real-time SPL calculations using FFTs from microphone samples while reducing aliasing through Hann windowing techniques. Users can easily store live spectra for later reference and access through intuitive interface features.

The loudspeaker polarity checker assists in verifying speaker wiring integrity. The Noise Criteria function overlays NC contours on the RTA display while displaying current NC values in real-time. Furthermore, RT60 measurements can be conveniently conducted using either a loud clap or pink noise generated by AudioTool.

The signal generator provides versatile outputs including White and Pink Noise as well as various waveforms with an accuracy of about 1%. While sine wave fidelity remains high across most frequencies, some characteristics may vary based on device quality.

This succinct overview serves as a preliminary guide to the robust capabilities of the SPL Meter. Detailed information is available in the comprehensive Online Manual: 
<a href="https://sites.google.com/site/bofinit/audiotool">here</a>.

The AudioTool Discussion Group is another valuable resource for users seeking assistance with features, calibration files or reporting any issues encountered:
<a href="http://groups.google.com/group/audiotool-discussion-group">Join here</a>.

Please note that AudioTool's performance is contingent on device specifications and may not comply with all audio measurement or safety standards.

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