Recommended by "Sound and Vision" magazine.
Features 1/1, 1/3 & 1/6 octave RTA modes, Leq (wideband, Octave, variable duration), RT60 (wideband, Octave), Spectrogram, Peak frequency, Fast, Medium & Slow filters, Flat & A/C Weighting and film industry X Curve, Averaging, SPL Chart Recorder, Noise Criteria, White/Pink Noise, Sine, Square, Triangle, Sweep, Ramp and Impulse signals & loudspeaker polarity checker, L/R select. RTA Store & Load, Hann windows, "Keep Screen On", pinch to zoom, scroll to center.
Exclusive ISO 1/3 Octave Calibration - correct for your phone's microphone response. Octave calibration discs are moved up or down to obtain a flat response, and match the overall SPL to that of an external meter. Save/Restore of Cal files (Dayton Audio iMM-6 also supported).
Use: home theater, audio engineer, car audio, etc
AudioTool FFTs sets of samples recorded at the microphone. Aliasing reduced by Hann windowing. SPL calculated in realtime. Spectra may be saved as files on the SD card, then loaded and displayed with the live spectrum. The "Store" button stores the current live spectrum - "Load" shows a list of stored spectra to select.
To hide the buttons, tap the screen. To restore them, tap again. To zoom the scale, pinch the screen. To move the scale, drag it up or down (left or right).
The deciBel meter uses IIR filters and exponential averaging to calculate Flat, A and C weighted response at speeds of Fast, Medium and Slow speeds.
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 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 using the "RT60" button, and then using a loud clap (or similar) to trigger the measurement. RT60 can also be used with Pink Noise from the AudioTool generator. 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, Sine Wave Sweeps and Impulses. The generator uses multiple cycled buffers, refreshed randomly so ensuring truly random White/Pink noise. Pink Noise algorithm uses Kemmet's method to adjust White into Pink.
The frequency accuracy of the generated periodic signals is typically around 1%. Sine wave fidelity is good throughout most of the audio range. Other signals' leading and trailing edges show ringing and decreasing frequency response artifacts in the upper ranges, depending on the Android used.
Please consult the online manual for complete descriptions of the AudioTool features:
Please join the friendly AudioTool Discussion Group to request features, find Calibration files, or report problems. Feedback is always welcome:
Disclaimer: AudioTool's performance depends on your Android hardware, and is not guaranteed to meet any audio measurement or safety standards.
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This astounding collection of Brazilian-Pop-Jazz compositions by renowned Brazilian keyboardist and pianist Luciano Alves features amazing percussion grooves, top-notch improvisations and sublime keyboard textures.
On this repertoire Luciano showcases his ability to speak a universal musical language and proves why he is considered one of the best Brazilian musician/composers.
He has six CDs: Quartzo, Baobá, Mosaico, Brazil Today, Luciano Alves Interpreta Ernesto Nazareth, Só o que a gente gosta (Luciano & Bettina). More than 60 of his tunes are currently in iTunes, Amazon, Rhapsody, CD Baby, etc.
In 1976, he joined the Os Mutantes (Brazilian pop-group), traveling throughout Brazil and Italy and recording the Mutantes ao Vivo LP. For 10 years he joined the Pepeu Gomes band as keyboardist and arranger, appearing with him three times at the Montreux Festival. He also recorded with Caetano Veloso, Moraes Moreira, Sergio Dias, L. Shankar and Do Um Romão, among others.
Since 1985 he has performed solo or with his band both in Brazil and abroad. In the classical music area, he has performed as a soloist with the Brazilian Symphony Orchestra in many concerts. In 1991 he toured Denmark, spotlighting Afro-Brazilian rhythms and his CDs.
In 2009 was released his CD Luciano Alves Interpreta Ernesto Nazareth and since 2010 he is performing in duo with Brazilian singer Bettina Graziani promoting the jazz/bossa-nova CD "Só o que a gente gosta".