You can try with the site Good Ear (http://www.good-ear.com), which offers the service for free, helping you with your first steps.
Unfortunately, a lot depends on personal characteristics, even if something can be learned through practice, especially if you have some predisposition and just need to evoke it.
The situation is quite complex: briefly, there are people endowed with absolute pitch, i.e., the ability to identify frequency and, therefore, a musical note (its color); other people are endowed with relative pitch, i.e., the ability to identify the ratios between the frequencies of two notes and, therefore, musical intervals (darker, lighter); others have no such ability at all and cannot even say if a note is higher or lower than another (colorblind), others respond well sometimes and poorly other times (uncertain)!
Everyone can perform ear training exercises, but keep in mind that the results depend both on physiological characteristics and psychological characteristics, as well as, as demonstrated by various research, on the age at which the exercise begins; it is indeed proven that children introduced early to music develop absolute pitch because from a young age they call notes by their names and associate their frequency with them. Finally, the ability in question also depends on the timbral richness and variability of the emission and the environment!
Many people claim it is possible to develop absolute pitch starting from ear training; among these, David Burge, who became famous thanks to the course, "Perfect Pitch Ear Training Supercours", which summarizes his research conducted at the Universities where he taught; so go ahead and try, but remember that, to date, there is no certain scientific evidence in favor of the theory.
Hello and good luck with your work