Go Back   Team-BHP > Under the Hood > In-Car Entertainment


Reply
 
Thread Tools Search this Thread
Old 29th January 2008, 23:13   #1
BHPian
 
Tool's Avatar
 
Join Date: May 2006
Location: Mumbai
Posts: 350
Thanked: 3 Times
Default jelly subwoofers ?? - Why is this happening?

came across this video on you tube .
Clarion subwoofers but behave like jelly.
I think this is a too funny.
click on the links below.




Last edited by Tool : 29th January 2008 at 23:15.
Tool is offline   Reply With Quote
Old 29th January 2008, 23:41   #2
Senior - BHPian
 
vikram_d's Avatar
 
Join Date: Jul 2006
Location: Bangalore
Posts: 2,380
Thanked: 936 Times
Default

How in hell is this possible? Could be some camera trick?

Last edited by vikram_d : 29th January 2008 at 23:50.
vikram_d is offline   Reply With Quote
Old 29th January 2008, 23:45   #3
Senior - BHPian
 
kaushik_s's Avatar
 
Join Date: Sep 2006
Location: Bangalore
Posts: 1,064
Thanked: 148 Times
Default

It's just the camera got fooled with the speed that the subs were moving I guess.
kaushik_s is offline   Reply With Quote
Old 29th January 2008, 23:52   #4
Senior - BHPian
 
blueraven316's Avatar
 
Join Date: May 2006
Location: Bangalore
Posts: 1,109
Thanked: 14 Times
Default

FAKE With a BIG "F"
TwentyChars
blueraven316 is offline   Reply With Quote
Old 30th January 2008, 00:40   #5
BHPian
 
Tool's Avatar
 
Join Date: May 2006
Location: Mumbai
Posts: 350
Thanked: 3 Times
Default

has to be fake!!
but what the hell is going on there ?
im very curious.
Tool is offline   Reply With Quote
Old 30th January 2008, 00:55   #6
BHPian
 
A S H V I N's Avatar
 
Join Date: Apr 2006
Location: Cochin
Posts: 257
Thanked: Once
Default

the wobbling looks very much as though it has been edited in ..

now who would want their subs to wiggle away like that and potentially spill out into the boot!! not a sweet idea!! :|
A S H V I N is offline   Reply With Quote
Old 30th January 2008, 01:19   #7
Senior - BHPian
 
Join Date: Sep 2005
Location: New Delhi
Posts: 2,462
Thanked: 20 Times
Default

No No, its not a fake...

Its just the waves screwing up the camera optics or something. I have a video like this of my subs...
gunbir is offline   Reply With Quote
Old 30th January 2008, 10:53   #8
BHPian
 
A S H V I N's Avatar
 
Join Date: Apr 2006
Location: Cochin
Posts: 257
Thanked: Once
Default

aaah ok .. basically the cam cant keep up with the sub hence causing the blurred image!!
A S H V I N is offline   Reply With Quote
Old 30th January 2008, 12:02   #9
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

This the due to camera having less frame per seconds than the sub.
low_bass_makker is offline   Reply With Quote
Old 30th January 2008, 17:12   #10
Team-BHP Support
 
Rehaan's Avatar
 
Join Date: Feb 2004
Location: Bombay
Posts: 22,367
Thanked: 22,584 Times
Default

Quote:
Originally Posted by gunbir View Post
Its just the waves screwing up the camera optics or something. I have a video like this of my subs...
If the video wasnt doctored, it looks to me like its happening because of the camera being progressive scan. This basically means that the image (each frame) is captured by the camera horizontal line by line to make up a frame. There is a very very short delay between capturing one line and the next, so...

Basically, if you have an object flying across the frame (say from L to R), the top lines will register the object closer to the left than the bottom lines, as the camera scans downwards line by line to make up the image/frame.

Example : (you can clearly see how the top of the wheel is further left than by the time the lines of the bottom of the wheel are captured)


Image credits to V12 or Gordon if i am not mistaken?


This is quite common with cellphone cameras, if you have ever tried to take a video of something panning by fast (or if you pan the camera fast) you notice that the video will get distorted while panning.

So basically the same thing is happening here. The sub is vibrating very fast, somewhere between 10-200Hz (right ICE people? ), which means its going back and forth 10-200 times a second, and hence the progressive scan camera picks it up at a different place each line it captures, resulting in the warped / jelly effect.

cya
R

ps - i bet if someone busted out a cellphone camera and played test frequencies on the sub it would either hold its warped position at just the right frequency, or it would waver in a fixed/constant motion.

Last edited by Rehaan : 30th January 2008 at 17:16.
Rehaan is offline   Reply With Quote
Old 30th January 2008, 20:10   #11
BHPian
 
Tool's Avatar
 
Join Date: May 2006
Location: Mumbai
Posts: 350
Thanked: 3 Times
Default

Thanks guys. That explanation really helps.
Funky video though. The link was sent to me by my cousin in the states cause he knows im into sound engineering . He thought it was huge laugh.
Thanks guys
Tool is offline   Reply With Quote
Old 30th January 2008, 23:45   #12
Senior - BHPian
 
Join Date: Sep 2005
Location: New Delhi
Posts: 2,462
Thanked: 20 Times
Default

Quote:
Originally Posted by low_bass_makker View Post
This the due to camera having less frame per seconds than the sub.
What?

LBM... do Subwoofers even have frames per second?
gunbir is offline   Reply With Quote
Old 31st January 2008, 05:53   #13
BHPian
 
clipto333's Avatar
 
Join Date: Dec 2006
Location: jalandhar
Posts: 912
Thanked: 5 Times
Default

i have seen a video of a hertz sub doing the same thing. i know its the cam, not the sub. lol.

gunman, how low an idq can go in FPS lol p:

cheers
clip
clipto333 is offline   Reply With Quote
Old 31st January 2008, 09:48   #14
BHPian
 
Autophile's Avatar
 
Join Date: Sep 2005
Location: New Delhi
Posts: 930
Thanked: 0 Times
Default

Quote:
Originally Posted by clipto333 View Post
gunman, how low an idq can go in FPS lol p:
Goes so low, even SLR's cannot capture
Autophile is offline   Reply With Quote
Old 31st January 2008, 11:35   #15
Senior - BHPian
 
Join Date: Mar 2006
Location: Faridabad
Posts: 6,814
Thanked: 294 Times
Default

Quote:
Originally Posted by gunbir View Post
What?

LBM... do Subwoofers even have frames per second?
If you have read the Rehaan post you might not be asking me this.
low_bass_makker is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
An Ode to my Zen, Cute little jelly bean Silver Knight Long-Term Ownership Reviews 10 20th June 2013 16:04
Impedance of Subwoofers 929RON In-Car Entertainment 36 31st August 2006 14:28
6x9 Subwoofers theEnd In-Car Entertainment 16 31st July 2006 13:57


All times are GMT +5.5. The time now is 19:19.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks