How to get started analyzing audio signals for detecting cracks in a material? I have two processes, one is normal and the other with some cracks of material. And I have the acoustic signals got from the materials by a sensor. I want to compare these signals to see if this signal can be used to detect cracks. I think two different processes (with and without cracks) will create two different signals. Based on that, I want to compare these signals, but I'm new to DSP.

Could you please give me some suggestions what I should do, step by step to process these signals?

(I will of course read books to get knowledge about DSP, but it's really huge. I therefore hope that someone can tell me what I should do, step by step to process those signals. By doing so, I can save some time)
Not really a programming question!

In any case if you need to read books to understand DSP and are trying to compare two non stationary processes I suggest you start reading right away because most steps I tell you won't make sense and you need to answer a host of questions even before anyone can answer this question.

Signal processing deals with lot of statistical phenomena and you have to work with it emperically many a times. Not to say there are no fixed rules but the step-by-step to process this signals is hard enough when data is stationary. Given that you have non stationary data, get reading and once you have a hang of it ask some pointed questions on dsp.stackexchange.com