Buyer’s Spotlight: Electromagnetic vs. Electrostatic Loudspeakers In this buyer’s spotlight the physics behind electromagnetic and electrostatic loudspeakers will be used to compare, contrast and justify which is best option for sound section of an integrated home theatre system. (main points, headings) What physics principles are behind: Electromagnetic loudspeakers convert the electrical signal back into sound by the voice coils vibrating. The original sound is recorded by a microphone and is amplified until it is large enough to be applied to the voice coils. The voice coils, electromagnets, are in the magnetic field of a permanent magnet. As the voice coils are an electromagnet they are able to change the polar orientation. As the amplifier applies the signal the voice coils change polarity and react with the permanent magnet continually. The voice coils vibrate at the same frequency, harmonic content and magnitude of relative sounds. The voice coils drive the cone of the speaker, moving the air and creating air pressure differences and, thus, sound. Figure 2. Electromagneti...
The purpose of this experiment was to determine whether if the sound is affected when it travels through different length pipes. The method used to do this experiment was created by using 5 different PVC pipes in the lengths of 10, 20, 30, 40, and 50 centimeters. Then, using a tuning fork, sound will be produced on one end of the PVC pipe and measured with a decimeter on the other end. This experiment was recorded using 5 trials for each independent level and the average decibels (dB) for each pipe length were recorded.
internal structures of the body and returned to the transducer. The transducer converted the returning sound into electronic signals that were processed
The mechanical motions of the ossicles directly vibrate a small membrane that connects to the fluid filled inner ear. From this point, vibration of the connective membrane (oval window) transforms mechanical motion into a pressure wave in fluid. This pressure wave enters and hence passes vibrations into the fluid filled structure called the cochlea. The cochlea contains two membranes and between these two membranes, are specialized neurons or receptors called Hair cells. Once vibrations enter the cochlea, they cause the lower membrane (basilar membrane) to move in respect to the upper membrane (i.e. --the tectorial membrane in which the hair cells are embedded). This movement bends the hair cells to cause receptor potentials in these cells which in turn cause the release of transmitter onto the neurons of the auditory nerve. In this case, the hair cell receptors are very pressure sensitive. The greater the force of the vibrations on the membrane, the more the hair cells bend and hence the greater the receptor potential generated by these hair cells.
Bose Australia. (n.d.). What if music flowed through your home like electricity? SoundTouch Wi-Fi music systems Retrieved from http://worldwide.bose.com/axa/en_au/web/wifi_music_systems/page.html.
A transducer is a mechanism that changes one form of energy to another form. A toaster is a transducer that turns electricity into heat; a loudspeaker is a transducer that changes electricity into sound. Likewise, an ultrasound transducer changes electricity voltage into ultrasound waves, and vice versa. This is possible because of the principle of piezoelectricity, which states that some materials (ceramics, quartz, and others) produce a voltage when deformed by an applied pressure. Conversely, piezoelectricity also results in production of a pressure whe...
Laurie Halse Andersons, Speak, published in 1999 educates the reality of which we must speak out to be heard. Presumptively the novel is set in the late 90's at Merryweather high school in Syracuse New York. Protagonist, Melinda Sordino, narrates her story as a sexual assault victim. We journey through her freshman year and watch her suffer to find her lost voice and overcome her negative convictions . While her persona is revealed, we see that the rape forces change on Melinda through violence. Several months of self mutilation and bitter silence, she finally speaks up for herself and confronts her antagonist. Melinda's introspection through her art allows growth and she becomes a survivor. Her recovery nonetheless was tough and protracted.
Sounds are produced by the vibrations of material objects, and travel as a result of
... Physics." .::. The Pysics of Electric Guitars :: Physics. N.p., n.d. Web. 26 May 2014. .
... original sound. Many people dislike solid state amps because they do not have the classic tone of a tube amp. The cost of a solid state amp will be on the lower end of the scale. If the player wants the best of both worlds, another type of amp he or she can consider is called a hybrid amp. A hybrid amp will contain both solid state technology and valve technology. Many hybrid amps will have the power come from the solid state section and have the tubes power the sound. The cost of a hybrid amp will be between the cost of a solid state amp and a tube amp.
... middle of paper ... ... Designs, C. & B. 2013. ProSonic Acoustic Cubes -. [online] Available at: http://www.customaudiodesigns.co.uk/acoustic-cubes.htm [Accessed: 1 Dec 2013].
The sound waves from the caller's voice cause the plastic disk to vibrate, changing the distance between the disks, thus changing the intensity of the electric field. These variations are translated into an electric current which travels across the telephone lines. The receiver of a telephone is composed of a flat ring of magnetic material. Underneath this magnetic ring is a coil of wire where the electric current flows. Here, the current and magnetic field from the magnet cause a diaphragm between the two to vibrate, and replicate the sounds that are transformed into electricity.
Medical ultrasound mechanisms produce ultrasound waves and accord the imitated echoes. Brightness mode (B mode) is the frank mode that is normally used.[2] The B mode gives a two dimensional (2D) black and white picture that depends on the anatomical locale of the slice. The body can be imaged in disparate planes reliant on the locale of the probe. These slender slices are of less than 1 mm every single and can be sagittal, coronal, transverse, or oblique. Sound waves are emitted from piezoelectric crystals from the ultrasound transducer. Piezoelectric crystals are fabricated from physical that adjustments mechanical signals to mechanical vibrations and adjustments mechanical vibrations to mechanical signals.[2] As ultrasound waves bypass across assorted body tissues, they are imitated back to the transducer crafting an picture on the ultrasound screen.[3] Aural impedance is described as the confrontation for propagation of ultrasound waves. This varies according to the density of the physical ultrasound passes through. After the physical is extra solid, nex...
Owen, David. "How Sound Waves Work." Sound Waves. N.p., n.d. Web. 4 Apr. 2014. .
“Sound or acoustic energy involves the actual vibration of the actual material through which it passes and thus, in general, propagates best through solids and liquids, less well in gasses and not at all in a vacuum” (Wright et al., 1995, p. 70)
...placing a soft metal core (commonly an iron alloy) inside a coil of wire through which electric current passes in order to produce a magnetic field. The strength and polarity of the magnetic field changes depending on the magnitude of the current flowing through the wire and the direction of the current flow. While there is sufficient flow of current, the core behaves like a magnet; however, as soon as the current stops, the magnetic properties also disappear. Modern devices that make use of electromagnets are the televisions, telephones, computers and electric motors.