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Patrick Brown
9/11 Truth critic
Joined: 10 Oct 2006
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 Posted: Tue Nov 07, 2006 2:18 pm Post subject: New evidence for explosions |
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I been doing some analysis of video footage audio. I took the audio for the north tower collapse from Rick Segals video footage and from Etienne Sauret's short documentary WTC: The First 24 Hours. I aim to show that the explosions heard in Rick Segals footage are also hidden in the audio of the Sauret north tower footage. It's important to bear in mind the frequencies we will be looking at are very low and would normally be obscured by the much louder mid and higher frequencies.
Bellow you will find two images attached that show 3D fourier transformations for each audio clip (remember you can see the full size image by clicking). You will notice the similarities of peaks at certain times within certain frequency bands. The frequency bands are going from 20HZ up as they move towards the background. I EQed every thing above 100HZ out as much a I could.
The images shows time running from left to right and although the 3D fourier may at first be a little confusing stick with it. Use the grid lines to help you line up approximate times with amplitude peaks at different frequencies.
One interesting thing I noticed is a slight frequency shift of some peak in Rick Segal's audio. This may be explained by the distance the sound had to travel and may even help prove the authenticity of the audio of the two different video clips.
| Quote: | A sound wave traveling through a static medium will decrease in both amplitude and frequency over any given distance separate from it's origin.
Most often, the amplitude of the sound wave is dramatically degraded as opposed to its frequency, yet both do occur.
With sound waves, it can be looked on as a physical phenomenon of propagated cyclic compression and expansion(even if just once) in the medium of which the sound wave travels through.
As such, internal medium resistance to stasis fluctuations accounts for the decrease in amplitude.
Similarly, frequency, which can be defined here as the rate of change in time from cyclic compression/expansion is also affected, though often not as severe.
http://www.physicsforums.com/archive/index.php/t-15125.html |
I may try and expand on this although I'm no scientist perhaps someone can forward this information to Steve Jones. Also if anybody knows of any video with good audio that was taken at least 17 seconds before the collapse of the north tower I would be greatful if they could PM me or post a link on this thread.
The Etienne Sauret video clip here: http://www.911research.com/wtc/evidence/videos/docs/n_tower_1st24.mpg
Rick Segals documentary here available here: http://www.question911.com/linksall.htm
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Last edited by Patrick Brown on Tue Nov 07, 2006 4:10 pm; edited 1 time in total |
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chek
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| Posted: Tue Nov 07, 2006 3:11 pm Post subject: |
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This seems to be a new approach I haven't seen before Patrick - good going.
Some low frequency thuds and noises have been passed off as camera bump or wind noise, but by isolating which signals are common between multiple recordings, it should be possible to identify the real explosive sounds from the rest.
That should clarify things a lot.
The sort of thing in fact a proper investigation might have thought to do with state of the art equipment and technicians, if they'd really been interested in finding out the truth rather than shoring up a lie.
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Patrick Brown
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| Posted: Tue Nov 07, 2006 3:58 pm Post subject: |
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In time I should be able to notch out the frequencies where the explosions are most noticeable i.e. Spikes / Peaks. The low frequency waveform should act as a signature making it impossible to deny explosions happened prior to collapse. This is hidden evidence as low frequency rumbles would not be recognizable to the human ear unless the volume is really jacked up and even then it's very difficult. Remember the whole idea of the compression method behind the success of the mp3 format is that it removes frequencies that the brain doesn't register. I'm pretty sure that av i file as well as modern video formats still use PCM which is similar to CD audio although the bit rate is often lowered. The lower bit rate doesn't effect lower frequencies.
So bearing the above in mind it may be that many of the video clips (including audio from radio) from 911 are carrying a hidden message. I'm going to have a go at finding some hidden messages on footage from the collapse of the south tower. There are quite a few clips of reporters talking before the tower collapses. Again we have Rick Segal's footage as a starting point. You may not hear anything but it doesn't mean there's not a series of low frequency peaks. I do suspect though that most of the pre-collapse explosions for the south tower happened in the seconds before and after the aircraft impacted. Remember the south tower seismic data for it's collapse was 0.2 less than the north tower and as the Richter scale is logarithmic so that's quite a big difference that needs to be accounted for. Of course most of us suspect the the seismic date is actually the result of explosions is the basements especially when you consider the 47 steel columns were driven right to the bedrock of Manhattan Island.
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chek
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| Posted: Tue Nov 07, 2006 4:13 pm Post subject: |
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| Patrick Brown wrote: | In time I should be able to notch out the frequencies where the explosions are most noticeable i.e. Spikes / Peaks. The low frequency waveform should act as a signature making it impossible to deny explosions happened prior to collapse. This is hidden evidence as low frequency rumbles would not be recognizable to the human ear unless the volume is really jacked up and even then it's very difficult. Remember the whole idea of the compression method behind the success of the mp3 format is that it removes frequencies that the brain doesn't register. I'm pretty sure that av i file as well as modern video formats still use PCM which is similar to CD audio although the bit rate is often lowered. The lower bit rate doesn't effect lower frequencies.
So bearing the above in mind it may be that many of the video clips (including audio from radio) from 911 are carrying a hidden message. I'm going to have a go at finding some hidden messages on footage from the collapse of the south tower. There are quite a few clips of reporters talking before the tower collapses. Again we have Rick Segal's footage as a starting point. You may not hear anything but it doesn't mean there's not a series of low frequency peaks. I do suspect though that most of the pre-collapse explosions for the south tower happened in the seconds before and after the aircraft impacted. Remember the south tower seismic data for it's collapse was 0.2 less than the north tower and as the Richter scale is logarithmic so that's quite a big difference that needs to be accounted for. Of course most of us suspect the the seismic date is actually the result of explosions is the basements especially when you consider the 47 steel columns were driven right to the bedrock of Manhattan Island. |
Just on a technical point, it's actually more common for mpeg files to use PCM encoding (which is why the amount of audio data usually dwarfs the video data). Avi files - especially when processed by a DivX or Xvid codec tend to also be mp3 encoded in a further effort to reduce file size.
DVD is probably the better format to work from, bearing this in mind.
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Patrick Brown
9/11 Truth critic
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| Posted: Tue Nov 07, 2006 4:30 pm Post subject: |
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| chek wrote: | | DVD is probably the better format to work from, bearing this in mind. |
Thanx for the clarity. Even compressed audio will show peaks in the lower frequencies although to get an exact match I would need goodish quality audio.
You can see from my images that if certain frequencies are chopped out of the audio I may find it difficult to match up the finger prints.
Yes I've been thinking about buying some DVDs any that you would recommend?
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DeFecToR
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| Posted: Wed Nov 08, 2006 10:32 am Post subject: |
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Excellent work PB. Keep it up. I'm no expert in this area and as such would like your completed analysis to be ran by the critics for their take. Seems pretty solid so far but i'll wait until you're done.
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chek
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| Posted: Wed Nov 08, 2006 10:47 am Post subject: |
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| Patrick Brown wrote: | | chek wrote: | | DVD is probably the better format to work from, bearing this in mind. |
Thanx for the clarity. Even compressed audio will show peaks in the lower frequencies although to get an exact match I would need goodish quality audio.
You can see from my images that if certain frequencies are chopped out of the audio I may find it difficult to match up the finger prints.
Yes I've been thinking about buying some DVDs any that you would recommend? |
Hmm, you'd need to check what is available on DVD - all my versions of stuff are from downloads which I normally convert to DivX/mp3 for space reasons.
I've noticed that some 911 torrents are in DVD format, but I usually avoid them in favour of avi's where possible.
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flamesong
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| Posted: Wed Nov 08, 2006 11:00 am Post subject: DVDs |
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| If you are talking about the 'official' commemorative DVDs, I have two or three at home. I don't mind sending you copies - if I have understood you correctly.
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Patrick Brown
9/11 Truth critic
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Patrick Brown
9/11 Truth critic
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| Posted: Wed Nov 08, 2006 11:11 am Post subject: Re: DVDs |
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| flamesong wrote: | | If you are talking about the 'official' commemorative DVDs, I have two or three at home. I don't mind sending you copies - if I have understood you correctly. |
Thanx I'll PM you. 
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scar
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Joined: 25 Feb 2006
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Location: Brighton
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| Posted: Wed Nov 08, 2006 11:19 am Post subject: |
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| Patrick Brown wrote: | | chek wrote: | | DVD is probably the better format to work from, bearing this in mind. |
Thanx for the clarity. Even compressed audio will show peaks in the lower frequencies although to get an exact match I would need goodish quality audio.
You can see from my images that if certain frequencies are chopped out of the audio I may find it difficult to match up the finger prints.
Yes I've been thinking about buying some DVDs any that you would recommend? |
Pm me your address if you want me to send ya some.
911 Eyewitness/911 Revisited/Martial Law/Loose Change/911 Mysteries etc
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