Features

Spektro:skop turns your device into a powerful digital spectrum analyzer with a built-in, high-quality audio interface and a nicely integrated omni-directional measurement microphone.

Here is what you get in detail

Input!

• Supported audio sources:
• Internal microphone of iPhone, iPad or iPod Touch
• External microphones, instruments or analog audio sources connected through the headphone jack
• Digital audio devices connected through the 30pin or lightning connector
• Bluetooth audio
• Diffuse-field and free-field calibration of the internal microphone for all supported iPhone models.
• Free-field calibration of the internal microphone for all supported iPad models.
• Support for the MicW i436 measurement microphone with built-in free-field and diffuse-field calibration.
• Support for the Microtech Gefell M372 microphone with built-in free-field and diffuse-field calibration.
• Sensitivity and frequency response calibration of the analog input for all supported iPhone and iPad models.
• Automatic input gain control for most internal and all external microphones.
• Typical dynamic range from 30 dB(A) to 120 dB(A).

Analyze!

• 48 kHz sampling rate, 125 dB analog input dynamic range, 32 Bit internal processing resolution.
• 8192 point real-time FFT with 5 Hz frequency resolution.
• Optional octave band and third-octave band resolution
• Optional A- and C-frequency weighting.
• Fast or slow decay rate or time average calculation.
• Calculation of total sound pressure level (SPL) for calibrated inputs.

Display!

• Clutter free design for maximum information at a glance.
• Carefully designed individual user interfaces for iPhone and iPad
• Hold buffer function for up to four spectra.
• Detail view for value-by-value comparison of all displayed spectra.
• CSV data export to Dropbox, Numbers, etc. or via iTunes.
• Line or area graph style.
• Optional dark or light graph background for optimized contrast.

FAQ

What frequency range can I analyze with your App?

In theory, the internal processing allows to analyze frequencies between 0 Hz (DC) and 24 kHz. For the internal microphones I would trust the absolute values between about 50 Hz and 16 kHz.

And what about the dynamic range?

The lowest total sound pressure level you will be able to analyze with the build-in microphone is around 30 dB(A). If you can hear it, you will probably see it, too.
The maximum level depends highly of the frequency content of the signal. With the built-in microphone you should be able to measure total sound levels of up to 120 dB(A).

How can I get my saved CSV-files off the iPhone?

Spektro:skop gives you the option to export all data you currently see to a comma separated value file (CSV).
After the file has been saved, you have the possibility to open the exported file directly in another App on you device. This is the easiest way to send your data to Dropbox, Numbers or any other App that can handle CSV-files, but it only works at the moment you save the file.

To export multiple files, or export a file later, you can use iTunes' file sharing support. In short: connect your device to iTunes, select your device, navigate to the Apps section of your device and select Spektro:skop in the list of Apps that support file sharing. Here is a more detailed description in Apple's official help documents how to use file sharing.

That is not enough information for me – where is the handbook?

There is none. And you don't really need one, do you?
I've put a lot of effort into making Spektro:skop easy to use and easy to understand. If I have failed at some point and you don't immediately know what to do, just send me an e-mail and let me know.