A free program for Android, by Dominique Rodrigues.

Sound Analyzer App is the most advanced application of its kind, which will not only provide you with the most accurate measurements, but also allow you to have a real-time audio analysis of the sound around you. 

This app is made for people who are interested in the noise level in their environment and would like to know what are the noise sources and how much noise it is. 

In the Sound Analyzer App, you can find different types of measurements. These include the standard sound level meter (SLM) and the real-time audio analyzer (RTA). The latter can also be used for the noise analysis. 

There is also an option for measuring the noise level in a specific frequency range. For example, if you want to analyze the noise in the range of 25-3500 Hz, you can use the 1/3-octave band spectrum.