Problems of Forensic Sciences 2001 Vol. 47 (XLVII) 20-39
ESTABLISHMENT OF THE INDIVIDUAL CHARACTERISTICS OF MAGNETIC RECORDING SYSTEMS FOR IDENTIFICATION PURPOSES
José A. García SÁNCHEZ-MOLERO
Centro de Investigación y Criminalística, Guardia Civil, Madrid, Spain
Streszczenie
Traditionally, in the process of authentication and establishment of the originality of recordings on magnetic tapes, the marks generated by the heads of recorders (STOP, START and PAUSE) have been used as the elements that make possible to determine what recorder was the source of a given recording. However, there have always been some questions that were never answered fully or clearly enough. Specifically, the literature consulted did not answer questions like the following:
– Does an individual recorder produce a mark different from the others (distinctive marks)?
– Are the marks of recorders of the same brand and model significantly different from one another?
– Are these marks stable for long periods of time or do they change with use?
– Do these marks remain after copying or modifying the recordings?
In this report, the author studied fifty (50) different types and brands of recorders and tried to answer these questions.
Słowa kluczowe
Authentication of recordings; Marks of recorders.