So So 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.
Great for quick tests. 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.
Good app 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.
LAB CHECK AND RESULTS 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.
WARNING: Starts at full volume! This can be a useful tool for testing your own hearing, also as a masking device which provides the common forms of white and pink noise. However one huge note of caution: do not start this device with headphones in your ears - you risk serious hearing damage! For some strange reason the app designers have encoded this so it automatically opens up with your phone set to full volume, unacceptable. I was able to use it to determine the specific frequency at which my high frequency hearing vanishes (8.4 kz)
My favorite oscillator. I have a problem with the UI of most other tone generators. This one is fast and simple, and allows me to scroll through frequencies at the right speed so I can zero in at what I'm looking for.
- 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
Frequency Sound Generator - waveform audio signal generator/ function generator