Function Generator

keuwlsoft

About this app

Dual channel function / waveform / signal generator for the speaker / headphone audio output.

Output is 16 bit for each left and right channels and at 44.1kHz. Output will depend on your device hardware. Some device hardware may may filter out the DC bias and low frequency signals. At high frequencies, the waveforms will be distorted due to limited number of samples for each waveform (for example at 4.41kHz, a sine waveform will be approximated by only 10 points). Therefore this is for fun/educational use, for critical applications use a real calibrated function generator.

Left and Right audio channels can be assigned to either channel 1 or channel 2.
Sine, Square & Triangular waveforms.
Frequency range from 1 mHz up to 22 kHz.
Amplitude as percentage 0-100%.
Set duty for square waveforms or skew triangular waveforms to get saw waveforms.
Offset the phase of waveforms.
Sweep frequency or amplitude (Single, Repeat & Bounce modes).
Amplitude Modulation (AM).
Frequency Modulation (FM).
Burst mode for a specific number of waveforms (1-10000).
White noise & pink noise Generator. Pink (1/f) noise falls of at ~3dB per octave between 43 Hz and 44 kHz.
Memory slots to save & recall channel configuration.
Select values with spring slider or number pad.

More detailed explanation available on website

Ratings and reviews

It is to work good in the old days. But one of the updates the channel One controls the left and right audio now. I have used these signal generators both professionally and on my phone. The one on the phone however doesn't work anymore. Still makes a tone. But not a stereo tone. Am I being helpful if you want mineral.

Very good and does what you need, I appreciate such an useful free app! A bit complex yet simple, the interface takes a bit to understand but it even has an info section to help you out. Only critique is that unlike a music player, the sound won't keep playing if you switch away or lock the device... thankfully it prevents the screen from powering down and the device locking so at least it won't stop on its own even if the screen will use power for no reason.

The app is great for something Free with no AD's. Interface is a little difficult to use but works great. Only thing that I don't like is that it doesn't support a higher sample rate than standard 44.1 Khz since many phones actually do. A higher sample rate would increase high frequency resolution, reduce distortion, and harmonics been chopped at the end of the frequency spectrum.

What's new

v1.42 Updated to use newer code libraries to better target and run reliably on devices in 2024.