question: Why do cars make that weird choppy noise when you roll down the windows?
comment: Have you ever blown in a bottle to get a tone? What's happening is that as you blow across the top of the bottle, it excites the air in the bottle and causes it to resonate. Now, when you open a car window, you're effectively turning the car into a giant bottle, but because it is so big, we hear the resonance as a chop rather than a tone, since the tone would be lower than we can hear. This is called Helmholtz resonance.
passages: A spectrogram of "Windowlicker" reveals a spiral at the end of the song. This spiral is more impressive when viewed with an X-Y scatter graph, X and Y being the amplitudes of the L and R channels, which shows expanding and contracting concentric circles and spirals.
   Front Sway Bar Drop Links - While not a serious concern, most E-classes end up with a sub clicking or rattling sound from the front end. This is usually due to worn out front-end sway-bar drop links. These can easily be replaced by anybody with minor knowledge of vehicle DIY, for no more than around £20.
   BULLET::::- Final dance sequence – Santa Monica Beach (Barnard Way and Ocean Park Boulevard)
   In recent years, the engine has developed a noise, referred to as "The Squeak". While the cause of this noise is not definitively known, it is presumed to come from the low pressure valve. There are no physical indications of scuffing, galling, or damage to components indicating a metal-to-metal contact. The squeak is more pronounced as the engine warms up, and goes away as the engine speed increases. The problem has so vexed the engineers that they have started a tongue-in-cheek fund, whereby visitors are required to donate $1 to the repair fund if they wish to talk to an engineer about it. (This fund may also be diverted to a beer fund, at the discretion of the engineer.)
   Many modern cars have a time delay feature, first introduced by Cadillac in the 1980s, called "retained accessory power". This allows operation of the windows and some other accessories for ten minutes or so after the engine is stopped. Another feature is the "express-down" window, which allows the window to be fully lowered with one tap on the switch, as opposed to holding the switch down until the window retracts. Many luxury vehicles during the 1990s expanded on this feature, to include "express-up" on the driver's window, and recently, some manufacturers have added the feature on all window switches for all passengers' convenience. This is done by activating the switch until a "click" response is felt.
   Soon after, a neighbor's dog is found dead with its neck broken. The dog's owner yells across the courtyard, complaining of her neighbors' callous disregard of others. All the neighbors run to their windows to see what is happening, except for Thorwald, whose cigar can be seen glowing as he sits quietly in his dark apartment.
   Chief Engineer of the Buick Division, Charles A. Chayne, "...had introduced an electrically controlled hydraulic system into the 1946 Buick convertibles that provided fingertip operation of the top, door windows, and front seat adjustment". These systems were based on major hydraulic advances made in military weapons in preparation for World War II. 
   Starting with the 2008 model year, U.S. government regulations required automakers to install safety mechanisms to improve child safety. However, the rules do not prevent all potential injuries to a hand, finger, or even a child's head, if someone deliberately holds the switch when the window is closing. In 2009, the U.S. auto safety administration tentatively decided against requiring all cars to have automatic reversing power windows if they sense an obstruction while closing. Proposed requirements concern automatic ("one-touch up") window systems, but most vehicles with this feature already have automatic-reversing. The federal government made a written contract that all automakers should make the lever switches (as opposed to the rocker and toggle switches) standard on all new vehicles by 1 October 2010.
   In an attempt to convince BMW that a more powerful air conditioner was needed for the United States market, two BMW engineers were subjected to a long trip to Texas in the rear seat of a black BMW 530i with the power windows disabled.
   There are several reports of ticking/rattling noises which have been caused by the hydraulic valve adjusters (also known as lifters or tappets). This noise can be caused by insufficient oil pressure to lubricate the lifters.
   BULLET::::- Noise 1: This is a very distinct noise that is usually much louder than the second noise that can be associated with this transmission. If the vehicle is not making any noise when trying to verify the condition, it can be induced by making several tight left hand circles with the vehicle at normal operating temperature.
   Modern heavy-duty highway tractors frequently have an option for power window controls; however, these are generally what is referred to as "straight air". That is, the compressed air system used for air brakes is also used for the windows. These types of trucks have long used compressed air cylinders for seat height adjustment. In a similar fashion to the electro-hydraulic system, the compressed air is merely released to lower the window and/or seat. The compressed air is then admitted to the respective cylinder to raise the window or seat. 
   Section::::Simulation.:Practical applications.
   Section::::400 and 351M.:Block Cracking Problems.
   Section::::Film cars.
   Section::::Music video.
  
  Section::::Music video.:Background and synopsis.
   On 28 January 2002, General Motors released a Technical Service Bulletin (TSB #02-07-29-001) addressing a "Grinding/Rattle Type Noise Coming From Transmission". The TSB was intended for the following GM vehicles equipped with the GM Quad 4 (RPO LD9) Engine and Getrag M86/M94 5-Speed Transmissions:
  
  BULLET::::- 2000-2002 Chevrolet Cavalier
  
  BULLET::::- 2000-2001 Oldsmobile Alero
  
  BULLET::::- 2000-2002 Pontiac Sunfire
  
  BULLET::::- 2000-2001 Pontiac Grand Am
  
  The bulletin continued to explain that there are actually two distinguishable noises which have two very different remedies.
   Power windows have come under some scrutiny after several fatal accidents in which children's necks have become trapped, leading to suffocation. Some designs place the switch in a location on a hand rest where it can be accidentally triggered by a child climbing to place his or her head out of the window. To prevent this, many vehicles feature a driver-controlled lockout switch, preventing rear-seat passengers (usually smaller children) from accidentally triggering the switches. This also prevents children from playing with them and pets riding with their heads out windows from activating the power window switch. 
   Most vehicle doors have windows, and most of these may be opened to various extents. Most car door windows retract downwards into the body of the doors, and are opened either with a manual crank, or switchable electrical motor (electric car windows other than the driver's window can usually be controlled at both the door itself and centrally by an additional control at the driver's position). In the past, certain retracting windows were operated by direct (up or down) pressure, and were held in the up position by friction instead of by an internal lift mechanism.
   A third common type of wrench utilizes a metal or plastic cup that is shaped much like a socket. The cup is placed on the end of the filter, which engages the knurling. A socket or wrench is then used to loosen the filter. Volkswagen Group and BMW cars require this type of wrench to remove their filters (or the lid of the filter housing, where a non-cartridge filter is used).
   Sound designer Peter Mohlin has attempted to use sound three-dimensionally, providing noises for when a car changes speeds, changes direction or turns on or off, with Herndon quoting that, “In a way, we’ve transformed the steering wheel into a kind of musical controller." According to "CD News", "Instead of current two dimensional sound – when a car is near or far away, or when it accelerates or decelerates – they have attempted to make sounds three dimensional to indicate what the car is doing more naturally." For example, as the car accelerates the noise rotates around the car at an increasing rate, eventually cutting as wind and tire noise reach a sufficient decibel level.
   The music video for "Windowlicker" was directed by Chris Cunningham, who had also directed Aphex Twin's previous music video, "Come to Daddy". It is a ten-minute long parody of contemporary American gangsta hip-hop music videos. In the video, two foul-mouthed young men (a Latino and an African American) in Los Angeles are window shopping for women; the French term for window shopping is "faire du lèche-vitrine", which literally translates to "licking the windows". They come across two women (referred to in the end credits as "hoochies") who repeatedly turn down their advances. Suddenly, a ridiculously long white limousine (38 windows in length, including driver's window, which takes 20 seconds to fully display) crashes into the two men's black Mazda Miata NA (MX5) convertible, and a "pimped-out" Richard D. James, displaying a hyperbolic amount of wealth and power, emerges with his signature fixed grin, at which point the song begins. The two women, among others, accompany James in his limousine while their faces morph into James' own likeness. When they emerge from the limousine's sunroof, the young men try to woo them again but fail. The men arrive at an area where James and a group of women bearing his face are dancing together, and they receive leis from two of the women. Their attention is eventually drawn to a dancing woman turned away from them, but she turns around to reveal a horrifically ugly, buck-toothed, deformed face (which was later illustrated in a sketch by Swiss artist H. R. Giger titled "The Windowlickers"), much to the men's horror. The video ends with James' women dancing on Santa Monica Beach while James pops and sprays a bottle of champagne.
   That era’s proliferation of heavy, typically vinyl-covered C—pillars opened the door to frantic copycatting that ended up permanently blurring the distinction between traditional opera windows, which still are found, and rear quarter windows, rear door vent windows, sharply raked fastback and hatchback rear windows, wraparound windows, and other established rear window design trends and treatments. 
  
  Section::::History.
  
  Section::::History.:Opera window.
   Jalousie window
  
  A jalousie window (, ) or louvre window (Australia, New Zealand, Pacific Islands, Southeast Asia, United Kingdom) is a window composed of parallel glass, acrylic, or wooden louvres set in a frame. The louvres are joined onto a track so that they may be tilted open and shut in unison to control airflow, usually by turning a crank.
  
  Section::::Etymology.
   Some drive mechanisms such as the Apple II -inch drive without a track zero sensor, produce characteristic mechanical noises when trying to move the heads past the reference surface. This physical striking is responsible for the -inch drive clicking during the boot of an Apple II, and the loud rattles of its DOS and ProDOS when disk errors occurred and track zero synchronization was attempted.
  
  Section::::Sizes.
  