Sounds plausible except they threw in the "...two miniscule pauses...each are 2 microseconds long." Even if you consider that the 2 microseconds could be a halfwave and we are looking at a response of 4uS on the tape, it would mean that the recording fidelity of the tape would need to be better than 250kHz. I can't buy that. 2 milliseconds I could buy. Maybe they misspoke.
I think they mispoke. 2 microseconds is imperceptible to the human ear as a "pause".Originally Posted by X-Rated
It has nothing to do with what you can hear, it's the analyzing of missing data from the voice recorder. They believe the missing data segments coincide with the shorting of a power cable to the fuel level sensor in the tank.
2uS on magnetic tape? I dare anyone to detect a 2uS pause on magnetic tape whether it is with any method you want. The tape response would have to be better than 500kHz actually.
I realize that and I wasn't disagreeing with you. I was replying to Corey that it wasn't about hearing anything. Even though in this case the "pause" wouldn't be detectable if it was 2 uS, longer ones that may be detectable by waveform analysis of the recording might not be audible. I agree, it can't be 2 us. Even 2 ms would probably not be detectable by just listening though.
That said, you'd have plenty of room on a video tape for that kind of response ;)
Last edited by N2CHX; 01-07-2013 at 11:46 PM.
It would hardly be a "pause". 2us isn't even out of tempo for speech is my point. Even if they saw the waveform analysis, it wouldn't be called a pause. It would be normal tempo of syllables.
Haven't done a lot of waveform analysis, have ya? ;)
I have, in both audio and RF. You most certainly would see it, because with any recording device, there is always ambient noise coming from various sources; microphones, amplifier stages, etc. It may not be a "pause" in terms of what you can hear, which is exactly what I said earlier, but if there is a loss of power to an amplifier stage or a microphone for example, you would most definitely see a change in a waveform analysis. This type of analysis of ambient noise is exactly how recordings are analyzed to determine if they are edited or not. It's really not as difficult as it might seem.
I'm positive you can see it in a waveform... What I am saying, 2 us is hardly a pause. It's less than a caught breath. It's within the normal syllabic pause range :)
Dunno if you viewed the video or not but the tape they showed from the black box was audio tape and the analysis they used certainly had 2 pauses that were audible.
You are right. I was thinking one instance and did not limit it.
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