The "trained ear" is required in this specialist area, where audio recordings are forensically examined.
A variety of high-quality technical equipment enables voice analyses, voice comparisons, the improvement of disturbed sound recordings, the analysis of background noise, etc.
In the context of a voice comparison report, a questionable voice performance of an unknown person can be compared with comparative recordings of a possible defendant. Tampering with audio carriers, e.g. cutting out information originally recorded on the audio carrier, can be uncovered with the help of technology.