loudspeaker - définition. Qu'est-ce que loudspeaker
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Qu'est-ce (qui) est loudspeaker - définition

ELECTROACOUSTIC TRANSDUCER THAT CONVERTS AN ELECTRICAL AUDIO SIGNAL INTO A CORRESPONDING SOUND
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  • A piezoelectric buzzer. The white ceramic piezoelectric material can be seen fixed to a metal diaphragm.
  • A three-way loudspeaker that uses horns in front of each of the three drivers: a shallow horn for the tweeter, a long, straight horn for mid frequencies and a folded horn for the woofer
  • An unusual three-way speaker system. The cabinet is narrow to raise the frequency where a diffraction effect called the "baffle step" occurs.
  • A bi-amplified system with an active crossover
  • banana plugs]].
  • abbr=on}}ch) high. Polar prediction software is [http://www.clfgroup.org/viewer.htm CLF viewer]. Loudspeaker information was gathered by the manufacturer into a CF2 file.</ref>
  • Woofers}} The hole below the lowest woofer is a port for a [[bass reflex]] system.
  • Specifications label on a loudspeaker
  • HP Roar Wireless Speaker
  • A four-way, high fidelity loudspeaker system. Each of the four drivers outputs a different frequency range; the fifth aperture at the bottom is a [[bass reflex]] port.
  • Grip connectors on a loudspeaker to connect it to a [[speaker terminal]].
  • Diaphragm}}
  • Magnetostatic loudspeaker
  • Diaphragm}}
  • Plasma speaker
  • A passive crossover
  • Electronic symbol for a speaker
  • Exploded view]] of a dome tweeter
  • Suspension}}

loudspeaker         
n. (to speak) over a loudspeaker
loudspeaker         
¦ noun an apparatus converting electrical impulses into sound, typically as part of a public address system.
loudspeaker         
also loud speaker (loudspeakers)
A loudspeaker is a piece of equipment, for example part of a radio or hi-fi system, through which sound comes out.
= speaker
N-COUNT

Wikipédia

Loudspeaker

A loudspeaker (commonly referred to as a speaker or speaker driver) is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound. A speaker system, also often simply referred to as a "speaker" or "loudspeaker", comprises one or more such speaker drivers, an enclosure, and electrical connections possibly including a crossover network. The speaker driver can be viewed as a linear motor attached to a diaphragm which couples that motor's movement to motion of air, that is, sound. An audio signal, typically from a microphone, recording, or radio broadcast, is amplified electronically to a power level capable of driving that motor in order to reproduce the sound corresponding to the original unamplified electronic signal. This is thus the opposite function to the microphone; indeed the dynamic speaker driver, by far the most common type, is a linear motor in the same basic configuration as the dynamic microphone which uses such a motor in reverse, as a generator.

The dynamic speaker was invented in 1925 by Edward W. Kellogg and Chester W. Rice issued as US Patent 1,707,570. Apr 2, 1929. When the electrical current from an audio signal passes through its voice coil—a coil of wire capable of moving axially in a cylindrical gap containing a concentrated magnetic field produced by a permanent magnet—the coil is forced to move rapidly back and forth due to Faraday's law of induction; this attaches to a diaphragm or speaker cone (as it is usually conically shaped for sturdiness) in contact with air, thus creating sound waves. In addition to dynamic speakers, several other technologies are possible for creating sound from an electrical signal, a few of which are in commercial use.

In order for a speaker to efficiently produce sound, especially at lower frequencies, the speaker driver must be baffled so that the sound emanating from its rear does not cancel out the (intended) sound from the front; this generally takes the form of a speaker enclosure or speaker cabinet, an often rectangular box made of wood, but sometimes metal or plastic. The enclosure's design plays an important acoustic role thus determining the resulting sound quality. Most high fidelity speaker systems (picture at right) include two or more sorts of speaker drivers, each specialized in one part of the audible frequency range . The smaller drivers capable of reproducing the highest audio frequencies are called tweeters, those for middle frequencies are called mid-range drivers and those for low frequencies are called woofers. Sometimes the reproduction of the very lowest frequencies (20-~50 Hz) is augmented by a so-called subwoofer often in its own (large) enclosure. In a two-way or three-way speaker system (one with drivers covering two or three different frequency ranges) there is a small amount of passive electronics called a crossover network which helps direct components of the electronic signal to the speaker drivers best capable of reproducing those frequencies. In a so-called powered speaker system, the power amplifier actually feeding the speaker drivers is built into the enclosure itself; these have become more and more common especially as computer speakers.

Smaller speakers are found in devices such as radios, televisions, portable audio players, personal computers (computer speakers), headphones, and earphones. Larger, louder speaker systems are used for home hi-fi systems (stereos), electronic musical instruments, sound reinforcement in theatres and concert halls, and in public address systems.

Exemples du corpus de texte pour loudspeaker
1. Advertisement "I was in front with a loudspeaker," he said.
2. By loudspeaker, hospital officials appealed for calm and blood donations.
3. A voice on the Camp Victory loudspeaker interrupted: "Attention, please.
4. One of the organizers pleaded for calm from a loudspeaker.
5. Patriotic songs were piped through a loudspeaker in the square.