Anders Lindman
Penultimate Amazing
- Joined
- Sep 17, 2010
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- 13,833
So, what did we miss in these milliseconds? Remembering the other channels were still recording.
Not milliseconds. Microseconds (millionth of a second):
"However, 0.73 and 0.68 seconds before the CVR recording stopped, there were brief (2 microseconds) changes in the electrical system background noise hum recorded by the captainís position CVR channel." -- http://www.ntsb.gov/doclib/reports/2000/AAR0003.pdf
"A sound spectrum study of the information recorded by the CVR revealed that twice within the last second of the CVR recording (about 0.73 and 0.68 seconds before the recording stopped), the captain's channel recorded harmonic tones at the 400 Hertz (Hz) frequency, but it did not record other electrical system background noise that it had recorded previously throughout the recording. These other electrical system background noises were recorded on the other CVR channels without interruption." -- http://www.ntsb.org/Wiringcargodoor/home_files/AAR0003.pdf
So there were two very brief, millionth of a second, gaps in the captain's channel recording. How could such brief gaps have been caused other than by manipulation of the recording with audio editing?