History and Future of Music Storage Methods

Generally speaking, a large-panel dipole ra... ... middle of paper ... ...other distorting the sound and in worst case scenario can sound like skipping in the song/sound. The best loudspeaker that have been compared, out of the two the best loudspeaker would have to be the electromagnetic speaker. This is because not only because the cost is cheaper to replace and buy this speaker but also based on the sound quality that it produces compared to the electrostatic. The electrostatic loses in sound production because if there is too much vibration the outer casing can easily brake and show the electric plates which if touched can cause harmful damage. The electromagnetic loudspeakers are better compared to the electrostatics appeal.

The magnetic field is amplified by each loop of wire around the nail. An electric motor depends upon magnetism to function, to be more specific, electromagnetism. By continuously changing the direction of the electromagnetic field in a motor, we take advantage of the basic magnet principle that ?Opposites attract and likes repel?. This allows an electric motor to rotate.

Generally, in recording, the sound waves impinge on a microphone and are converted into an electrical signal that is recorded by a tape recorder. The tape can be edited if desired. When a commercial phonograph record is to be made, a disk of soft acetate composition coated on an aluminum base, called an original, is placed on a rotating turntable. The tape is played back and controls a stylus that cuts a spiral groove starting from the outer edge and moving to the inner edge of the original. For monophonic sound the stylus vibrates from side to side as it cuts the groove.

Its primary role is to read digital information in a similar fashion as a CD player. Its secondary, but equally important, function is to supply focused heat to the minidisc itself during the recording process. LASER HEAT: The minidisc recording system takes advantage of a discovery by Pierre Curie in the 1880's. He found that when iron is heated up to a certain temperature, now called the Curie point, it loses its magnetic properties. Similarly, when the minidisc laser is directed at a tiny point of the disc during recording, it heats that spot up to 180 degrees celsius, and the disc material loses its magnetic properties.

Both are positioned so that the electromagnet is directly above the permanent magnet. A diaphragm is attached above the electromagnet. The diaphragm creates the sound wave as it vibrates. The alternating electric current that comes from the amplifier flows through the electromagnet which naturally causes its polar orientation to switch accordingly with the current. The permanent magnet that is below has a fixed polar orientation, so the electromagnetic will find it being constantly attracted and repelled in respect to its own alternation in polar orientation.

Attached to the diaphragm is a coil that is moved back and forth past a magnet which creates a current along the coil. The current travels through wires and into a loudspeaker. B) Credit cards contain a magnetic strip made up magnetic iron particles. Each iron particle has its south and north pole magnetized in a way so it will display the data of a particular card. When the card is swiped through a card machine, the magnetized spots move which create electrical voltages which are picked and ready by the machine as data.

This tape is then pulled by a metal rod known as Capstan. The coil that detects the magnetic frequency of a tape when played, and converts the signals into a sound is called playback head. This read tape is then rolled around the take up reel, by the help of tape guide that are two rotating wheels located on the top right and left corner and guides the magnetic tape from one reel to another. These tape guide also help in fast

More conductive electrodes such as copper and aluminum powder were found to be ineffective. Other common electrodes use are carbon grease or a mixture of carbon with silicone oil (Lochmatter 2007). A simple method for connecting the electrode to a power supply is to use adhesive metal foil tape like the type used in stained glass. Because the polymer is usually prestrained, it is important to have a frame holding the EAP in a stretched position. This can be accomplished by cutting an acrylic sheet to the desired configuration.

Electromagnetic Induction The phenomenon called electromagnetic induction was first noticed and investigated by Michael Faraday, in 1831. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing magnetic field about the conductor and is a very important concept. Faraday discovered that, whenever the magnetic field about an electromagnet was made to grow and collapse by closing and opening the electric circuit of which it was a part, an electric current could be detected in a separate conductor nearby. Faraday also investigated the possibility that a current could be produced by a magnetic field being placed near a coiled wire. Just placing the magnet near the wire could not produce a current.

Furthermore, the speakers need to be plugged directly into a power supply, making room placement more difficult (HowStuffWorks.com, 2001). There are also other advantages and disadvantages with both types of loudspeakers, but they tend to be too technical and require too much expertise to be explained in short here. Without regard to price, it can be assumed that the electrostatic speakers paired up with a woofer would be the first choice for audio quality oriented consumers. The light and widespread diaphragm provides clearer and more precise sound reproduction with a greater surround effect than what one would get from standard electromagnetic speakers.