I just wrote how to Turn a Tablet into a Signal Generator. In addition to generating signals, a tablet can be used as audio signal analysis. Typically the only way to get sound into those tablets and smart phones is through built-in microphone, which can be limiting. Here are some Android software for audio signal analysis software I have tried:
SimpleFFT is a real-time Fast Fourier Transform analyzer(audio analyzer) in the low-frequency region using the voice from the microphone built into your smartphone or tablet. This is a simple application that just shows the waveform and spectrum of the audio signal up to around 5 KHz. Here is a screen-shot of the application screen from Google Play shop (for some strange reason the image on the store is like this):
Spectral Audio Analyzer is a Free real-time audio analyser with 8 kHz spectral bandwidth. Display any sort of audio from the microphone as a coloured spectrogram. The programs says it can be used to identify environmental noise, search for annoying tones, view harmonic patterns of instruments and voices and analyse the frequency range of your speaker. In some applications this spectrogram view is more useful than just FFT display. The free version software has most configuration options disabled (works as advertisement for commercial version), but looks something that could become useful. Here is a screen shot:
TRA Audio analyzer claims to turn your Android phone into a professional audio analyser. The free version supports one, 1/2 and 1/3 octave filter and calibration (commercial professional version has more options). This software can be used to measure the frequency response of your audio equipment, identify tones and noises. Or I can think you could have your tablet sitting on your audio console and see trends as they develop before they become problems. I wish I have had this kind of tools at hand years ago when I worked more with PA systems.
The interesting idea on this software is the calibration to linearize the frequency response your smartphone / tablet audio input (mic or line in): for proper calibration you only need to supply a steady pink noise signal (you can get this of course from test CD, but software documentation says that background noise on quite place can work as pink noise source).
Here was my list of free applications I have tried. I also found some promising looking applications that you need to pay money for. Hare is my list of interesting looking application that you need to pay some money (and I have not tested):
AudioTool – SPL (deciBel) Meter featuring RT60, Spectrum Analyzer, Spectrogram, Chart Recorder, Signal Generator, Polarity Checker. Two methods of Mic calibration are offered. Recommended by “Sound and Vision” magazine.
SPL and Spectrum Analyser software says to give SO 1/3 Octave bars and Spectrogram.
SPL Meter says to be a professional-grade sound level meter, also known as a decibel or dB meter, on Android device.
FFT claims to be a professional-level RTA with mic calibration.
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Easy and Effective Way to Measure PWM… Without a Scope!
http://hackaday.com/2014/11/26/easy-and-effective-way-to-measure-pwm-without-a-scope/
The PWM signal in question is fed through a piezo speaker in parallel with a resistor. The output from the speaker is then sent to an FFT (fast fourier transform) app for Android devices, which produces a picture of a waveform. [schoolie] then opens the picture in MS Paint and uses the coordinates of the cursor and a little arithmetic to compute the period and the duty cycle.
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Phone Scope Build Uses Old Optical Drive
http://hackaday.com/2015/09/10/phone-scope-build-uses-old-optical-drive/
It is hardly news that you can use your smart phone as a really crummy oscilloscope. You can even use it as an audio frequency signal generator. There are also plenty of projects that allow you to buffer signals going in and out of your phone to make these apps more useful and protect your phone’s circuitry to some degree. What caught our eye with [loboat’s] phone oscilloscope project was its construction.
The enclosure used was an old CD ROM drive (although we imagine any optical drive would have worked). These are dirt cheap and–if your workshop closet looks like ours–probably free. The resulting build wouldn’t win any beauty contests, but for a piece of homebrew test gear it looked pretty good and required minimal effort.
OscilloPhone: Use your Smartphone as an Oscilloscope / Signal Generator
http://www.instructables.com/id/OscilloPhone-Use-your-Smartphone-as-an-Oscilloscop/
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Android oscilloscope built from parts just lying around
http://hackaday.com/2012/07/14/android-oscilloscope-built-from-parts-just-laying-around/
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http://hackaday.com/2010/10/14/android-oscilloscope/
Here’s a 2-channel Oscilloscope for your Android phone. It uses a base module driven by a dsPIC for signal processing. From there, an LMX9838 Bluetooth module broadcasts the data to the phone so that the waveform can be displayed. [Yus] ported some Python code he had been using over to a set of Java and XML files in order to get it working on Android.
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http://projectproto.blogspot.fi/2010/09/android-bluetooth-oscilloscope.html
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http://hackaday.com/2016/11/17/instrument-apps-on-your-phone-the-christmas-cracker-novelties-of-the-test-bench/
If you are interested in electronics or engineering, you’ll have noticed a host of useful-sounding apps to help you in your design and build work. There are calculators, design aids, and somewhat intriguingly, apps that claim to offer an entire instrument on your phone. A few of them are produced to support external third-party USB instrument peripherals, but most of them claim to offer the functionality using just the hardware within the phone. Why buy an expensive oscilloscope, spectrum analyzer, or signal generator, when you can simply download one for free?
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How to make Mobile Oscilloscope | Home made Oscilloscope | PWM | Oscilloscope DIY
https://www.youtube.com/watch?v=S1CYbK8GKv8