Great iPhone App for Audiophiles looking to make some measurements:

SolidSqual
SolidSqual Posts: 5,218
edited April 2011 in The Clubhouse
RTA is an awesome app that I have been using to do some measuring.

http://www.4pockets.com/iphone/iphone_pocketRTA.php

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Pocket RTA is a highly portable award winning real-time spectrum sound analyser for the iPhone.

Pocket RTA has many advanced features which are normally only found in much more expensive sound analysis software, providing fast and accurate spectrum analysis suitable for both amateur hi-fi enthusiasts and professional A/V engineers. Uses include system calibration, monitoring of noise levels and testing of audio equipment.

PocketRTA samples sounds using either internal or external microphones and then applies a Fourier Transform to the samples to obtain a frequency spectrum. The result is an accurate representation of the sampled sound broken down into its frequency components.

Various display modes include, linear narrow band, logarithmic narrow band, Octave, 1/3 Octave, Oscilloscope, SPL and Spectrogram displays with ANSI A and C weighting curves. Use the iPhone's multi-touch interface to perform real-time magnification of displays. The touch screen allows selection of the nearest FFT point giving a display of it's frequency and decibel level. Up to 16 times oversampling allow more stable readings for fluctuating or unstable input signals whilst our unique noise cancellation system allows you to remove unwanted background noise.

PocketRTA features the ability to calibrate the display using a 1/3 Octave display in order to compensate for imperfections in frequency response of both internal and external microphones. The program automatically detects and switches between both sets of calibration data.

Pocket RTA has the ability to capture up to 3 input signals and overlay them as a reference over live input. All display modes allow exporting of graphed data to the camera roll in JPEG format. These images can then by synced to your desktop PC for better analysis.

Please Note: When using a 1st generation iPhone the internal microphone limits the sample rate to 8KHz. Using an external microphone or headset allows up to 44KHz sample rate. The iPhone 3G does not suffer this limitation.
Post edited by SolidSqual on
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Comments

  • mantis
    mantis Posts: 17,190
    edited April 2011
    Very cool , I'm going to get it and give it a test drive. Thanks.
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • mantis
    mantis Posts: 17,190
    edited April 2011
    WOW 30 bucks , wonder if there is a trail version. Damn.
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • cokewithvanilla
    cokewithvanilla Posts: 1,777
    edited April 2011
    I;m trying this out right now... This is just what I needed... currently I only have an SPL meter on my phone...now I have something with so many features that I don't even know what they do :smile:

    RTL.png

    Thanks for the heads up
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  • SolidSqual
    SolidSqual Posts: 5,218
    edited April 2011
    It's pretty sweet right? Mantis, it is worth the cash. I'm happily surprised with the accuracy. Bear in mind I have the newest iPhone. I'm not sure how other versions work with this app.
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  • cokewithvanilla
    cokewithvanilla Posts: 1,777
    edited April 2011
    SolidSqual wrote: »
    It's pretty sweet right? Mantis, it is worth the cash. I'm happily surprised with the accuracy. Bear in mind I have the newest iPhone. I'm not sure how other versions work with this app.

    well, like I said, I don't really know what most of it does... or what I can do with it...
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  • nadams
    nadams Posts: 5,877
    edited April 2011
    I've found that most cell mic's will distort with the slightest hint of volume. Is this the same with the iPhone? If so, I don't see much of a use unless you're at lower volumes.
    Ludicrous gibs!
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