Gil says generated a thread about an "anomaly" in the dictabelt. Thread is here
https://educationforum.ipbhost.com/topic/29702-video-was-the-dallas-police-dictabelt-altered/
Gil's not getting much help over there.
For what it's worth, Gil:
I'm assuming that the anomaly that you're talking about is the repeating sequence of "Didja get that, 45?" that occurs just after the 1:12 timestamp.
That's no really an anomaly. It's the read stylus of the dictabelt machine reaching the end it's travel, so it starts to play the circumference worth of groove repeatedly. DPD ran their dictabelts at about 20 rpm, and the ~3 second period between repeats
is a dead giveaway.
Also, I get the 1:12 timestamp at 4:48 and the 1:15 timestamp at 6:57 on your video. That puts the two timestamps 2:09 apart. The "didjagetthat" sequence is 16 seconds long, and 13 of those seconds are repeats which shouldn't count. So, there is 1:56
worth of recording time between the timestamps.
The problem is, we don't know where in 1:12 the 1:12 transmission occurs, nor do we know where in 1:15 the 1:15 transmission occurs. They could be at 1:12:00 and 1:15:59, or they could be at 1:12:59 and 1:15:00. That is, they could represent a timespan
ranging from two to four minutes. This is compounded by the fact that the DPD radio recording system only began recording when it sensed a carrier signal be transmitted by a remote radio and stopped three seconds after the carrier signal stopped being
broadcast.
The upshot is that there is no good way to tell if any of the radio traffic was lost just by looking at the timestamps. If we assume the longest possible interval between 1:12 and 1:15, then two minutes may be gone, but that simply could be because the
Dictabelt was not set up to record continuously.
And if we assume the shortest possible interval, then there are only a few seconds that would need to be accounted for.
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