The 9/11 Forum

UPDATED


My colleague has made this video of the beginnings of an audio analysis of the Sauret Video

Part One

Update

Part Two Video is now available.

As with a thunder storm the clap of thunder is seldom simultaneous with the flash of lightening. This is due as I'm sure you're all aware, to the difference in the speeds of light and sound.

The camera position in the Sauret Video is 1608 meters distant from the tower, this gives a delay of 4.725 secs in the sound reaching the camera from the tower. When this offset is added, we are in effect listening to the sound of events at the tower locked to the visuals.

What's apparent is that there is a large explosive sound that coincides with the start of the descent.

Further work is proceeding to clean up the sound, removing helicopters, and restoring the bass spectrum, as the camera is likely to filter these low frequencies to prevent rumble etc.

Hunting UFOs, anyone?

peterene1 wrote:Hunting UFOs, anyone?

Que

So NIST say this is not a CD because nobody heard any explosion. I've heard the work my colleague is doing and there are many explosive sounds hidden by helicopters, both before and during the 'collapse' I'll post that work when it's done.

no_body wrote:My colleague has made this video of the beginnings of an audio analysis of the Sauret Video

http://zkt.blackfish.org.uk/119/SVA.mov

As with a thunder storm the clap of thunder is seldom simultaneous with the flash of lightening. This is due as I'm sure you're all aware, to the difference in the speeds of light and sound.

The camera position in the Sauret Video is 1608 meters distant from the tower, this gives a delay of 4.725 secs in the sound reaching the camera from the tower. When this offset is added, we are in effect listening to the sound of events at the tower locked to the visuals.

What's apparent is that there is a large explosive sound that coincides with the start of the descent.

Further work is proceeding to clean up the sound, removing helicopters, and restoring the bass spectrum, as the camera is likely to filter these low frequencies to prevent rumble etc.

The video link doesn't work.

Hi T_S

Does for me.

Its a .mov file which is Apple Quicktime format, maybe you have to download it locally?

no_body wrote:The camera position in the Sauret Video is 1608 meters distant from the tower, ...

Interesting. How do you know that?

Hi, no_body. I, too, am interested in the details of how you worked that out. There was no Street View when I took a crack at it. Have you identified a building he was in?

If the confidence is high, it should replace previously assumed (for that's what they are) values others are using.

Edit: if it is better, then I paradoxically get to proclaim "no_body's results are better than mine"

The Building on the left of the frame in the Sauret video is quite distinctive it's 101 6th Ave.

The location of the camera is on a balcony of a building on Dominick St at the junction with 6th Avenue. There is a park with some trees across 6th Avenue (between 6th Ave and The Avenue of the Americas) You can hear birds singing in the video if you listen closely. The steel mast helps to locate the camera in that it rules out the two blocks between 101 6th and Dominick St.



The rest is explained in the video.

Thanks.

All in all, pretty satisfying.

This is where I put the camera



back in these posts:

http://www.physforum.com/index.php?showtopic=12383&st=7710&#entry280115
and
http://www.physforum.com/index.php?showtopic=12383&st=7710&#entry280118

but ultimately stuck him in the park a little further back and to the right. Always wondered if he was in that building on the corner there.

However, I came up with 1562m for the distance (after a bit of sloppy guesstimation and measurement), not something I want to stick with if there's better available. Never did Google Earth, for example. Need to review your video.

Edit: sorry for the OT

no_body wrote:The location of the camera is on a balcony of a building on Dominick St ...

Thank you! This is most helpful. Do you have any idea how many stories up the balcony is?

The rest is explained in the video.

Unfortunately, I am video challenged. But I very much want to know the camera location as precisely as possible. (Same reasons as OneWhiteEye.)

OWE

Yes that is satisfying! Well done for getting that close without google earth!

I don't think the camera is in a building the soundscape has a definite outdoor feel to it, hence it must be on that balcony.

What's "the OT"?

DBB

I put the camera between 150 & 200 feet ASL, but it's a guestimate. I think a trip down "street view" is in order.

no_body wrote:What's "the OT"?

Off Topic.

I put the camera between 150 & 200 feet ASL, but it's a guestimate.

Thank you again. For now I'm going to use a ground elevation of 5 meters, hence 3 meters above the ground elevation of WTC 1 and then on the 14th story @ 12 feet per story, where the ground story is the first story, American style counting.

I think a trip down "street view" is in order.

? I don't fully understand, but please do so!

First off, it'd be nice if there was an audio track with that video, I couldn't find one, and I had all of the approrpiate volumes turned up to maximum, I still couldn't hear anything, and I know that that's neither the fault of my hearing or my laptop.

Secondly, bearing in mind that attenuation of volume (amplitude) varies with the square of frequency (so any such recording is automatically biased towards low frequencies) and that sound waves in air behave much the same as seismic waves (wave packets spread out, frequency shifts to lower values, higher frequencies attenuate quicker as previously mentioned) what proof is there that the noises that you refer to, and the video appears to refer to are anything more than the sound of floor pans colliding?

Verified. 1608m, plus or minus a few. Google Earth, gotta love it.

Excellent work, no_body.

"Street View" is another of Google's offerings that lets you pan around (even up) surroundings photos taken at street level. Too bad they haven't implemented Balcony View, or better yet Bedroom View.

David B. Benson wrote:

no_body wrote:What's "the OT"?

Off Topic.

Thanks

I think a trip down "street view" is in order.

? I don't fully understand, but please do so!

Here's what a trip down google 'Street View' shows.



I'm not sure, but I think the top 2 stories are new, so that would put the camera on the roof (balcony) of the 4th floor (American counting)?