Home About Us Laboratory Services Forensic Science Communications Back Issues October 2005 research Table 2 - Trial 1 Videotape-Testing Procedure...

Table 2 - Trial 1 Videotape-Testing Procedure

Table 2: Trial 1 Videotape-Testing Procedure

Step

Replay each tape.

1

Identify audio-track configuration.

2

Optimize playback using an automatic tracking control.

3

Identify replay-tracking position at three tape locations.

4

Detect and plot radio-frequency waveform.

5

Broadly group as many tapes as possible according to similar radio-frequency waveform shape, tracking position, and audio configuration.

6

Further separate tapes into groups using 6a and 6b.

6a

Visually compare plots.

6b

Compare overlaid similar radio-frequency waveforms at optimum and central replay-tracking position.