Problems of Forensic Sciences 2004 Vol. 57 (LVII) 51-80
THE INBUILT RECORDER OF MOBILE PHONES – POSSIBILITIES OF FORENSIC SPEAKER IDENTIFICATION
Agata TRAWIŃSKA, Mateusz KAJSTURA
Institute of Forensic Research. Krakow, Poland
Streszczenie
The study presents an experiment concerning recordings made by means of the inbuilt recorder of mobile phones. The recordings were investigated mainly from the point of view of forensic speaker identification. Thus, the recorded speech was examined with a view to finding a way of carrying out auditory speech analysis (especially description of a speaker’s learned articulatory patterns) and also assessing the value of acoustic speech parameters (amongst other things, extraction of the structure of formants F1–F3, which reflects both the anatomical characteristics of the vocal tract, such as size and shape and the speaker’s articulatory habits).
Some procedures for securing recordings made on mobile phone inbuilt recorders were proposed. Characteristic signal-markers were observed in incoming calls recorded by means of some mobile phone inbuilt recorders. These signals-markers may constitute an additional source of information about the continuity of a recording and also may indicate the probable make of the telephone used as a recorder.
Słowa kluczowe
Forensic speaker identification; Recording function in mobile phone; Acoustic and phonetic analysis; Reference material; Securing procedures.