Audio forensics is the field of forensic science related to the acquisition, analysis, and evaluation of sound recordings that may ultimately be presented as admissible evidence in a court of law; audio forensic evidence may come from a criminal investigation by law enforcement or as part of the official inquiry into a case.
Modern audio forensics makes extensive use of digital signal processing and some techniques of sound filtering.
Enhancement examinations are conducted to selectively reduce interfering noise on audio recordings to improve the intelligibility. Although the term is "enhancement", the process is almost entirely composed of filtering away unwanted sounds to leave a more understandable version of audio.
Signal or Sound Analysis
Signal analysis examinations are conducted to identify, compare, and interpret specific signals or sounds.
A transcription service is a business which converts speech into a written text document; by a thorough transcription process the examiner can realize the exact phrase or word, which was spoken in a conversation; transcription services are often provided for business, legal or other purposes.