Hello. I often use an online audio signal generator at work that runs on my phone.

It ranges from 1Hz to 20kHz.

It can generate different waveforms, such as sine, square, triangle, and sawtooth signals. The generator is online and no registration is required.

I use it quite a bit so I don't have to carry around a signal generator until I have to do some checking.

The website is:<Mod: link deleted>

 

Some but few on the forum do understand the role of wave files in producing audio for analysis and testing.
Some smart phones can not only output great audio but can also input and process sound.
When a good soundcard or audio interface is used to record a wave file it can loop through software
that can display a good FFT (Fast Fourier transform) which is useful such as sound quality. Arta and Rew,
Android and Apple have SDR apps now that passed beta testing.


Last year the cell tower near work was giving us problems. The cell phone showed good signal strength 4 bars.
I asked a senior ham radio operator whose thumb was on his PTT with connection to FCC.
I heard the repeater station relay back in 30 seconds most likely incident was being handled on site. The message came back,
The cell tower's provider digital sound portion was not working. We had carrier but no voice. I don't know if they triangulated
possible jam but I appreciate both the repair crew and the trouble shooters being faster than lightning.

Hello can you hear me now?