I am using RTLSDR on macOS with Cubic SDR, it works great and is very intuitive.
Now I want to do a frequency envelope analysis where I need to basically 3-d plot intensity versus frequency and time. I can probably figure out the math to do that part (or get help). But I need data.
The data I need is 1-second samples across the entire frequency range. What tools are available for loop over the frequency range and save the samples for each band?