Signal Generator v1.21

RadonSoft

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About this app

Developer Description

Turn your phone into an audio signal generator

Easy to use audio signal generator that creates white- and pink noise as well as sine waves.

Test the bandwidth of your phone's speaker (or your ears...), create true uncorrelated noise.

Make sure to check out our Spectral View, RTA and other apps in the Market.

Bugs and comments to support@radonsoft.net

What's New

- Sampling frequency changed to 44.1 kHz for better device compatibility and to avoid alias on certain devices due to bad resampling in the firmware

- Sound now stays on if device goes to sleep mode

Version Information

Version: 1.21
Downloads: 100K+
Updated on: Nov 8, 2011
Released: Jan 17, 2026
Requires: Android 1.5

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Signal Generator users say on Google Play

★★★★★

A Google user

I ran some very quick oscilloscope tests and it can provide a sine wave 20-20kHz, accurate to 2SF, the third SF is +-1 of the true value. Do not use this app when charging. If you do there will be a rather lovely 50Hz signal overlaid on the output. At higher frequencies its not an issue, but at lower frequencies the interference is very noticable, and at an output ~50Hz produces a lovely beat frequency. Remember that your android device is not designed as a signal generator, therefore the output is not going to be as clean and perfect as a real signal generator. Different devices may produce different results. I recommend you test yours with an oscilloscope where possible.

★★★★

A Google user

Does pretty well. Although I'd like to have +/- buttons in addition to the frequency slider, it's a bit difficult to test my lower hearing range currently. I use a headset with an analog volume control, so loudness isn't a problem for me.

★★★

A Google user

DONE WITH MY TEK 200MHz OSCILLOSCOPE, WITH A 100 OHM LOAD ON PHONE OUTS... I AM USING A NEXUS7 32G TABLET. 1. LOVE THE SIMPLICITY. 2. SINE WAVE VERY JITTERY, ESPECIALLY AT HIGH FREQS. 3. NOISES SEEM FINE... Good minimalistic approach, guys, but check out FuncGen (also free). Beats em all. And then, you can get AudioTool, but you pay... Probably good on phones to just generate pink noise into systems...or bother your friends. Keep up the work guys, can be better for us pros.

★★

A Google user

For some reason this app turns your phone media volume up to 100% regardless of setting and leaves it up after. I've been deafened a couple of times when I go to listen to music after.

★

A Google user

The sine wave is semi accurate, plenty good for audio testing. But, the levels are not accurate. When hooked up to an oscope on my s3, -10db 1 khz signal only produced 150 mV pk when it should be 447 mV pk. This will undoubtedly differ with different phones, but an actual db reading shouldnt be used if it isnt accurate.