The earpiece is a kind of accessory that transmits sound through communication tools such as telephones, walkie-talkies, and mobile phones. It is a kind of speaker, but it is generally not called a speaker. The term generally is used to describe parts of an electronic product that transmit sound. Such as: mobile phones, walkie-talkies, and so on. There is a small film inside the microphone and the earpiece. The film in the microphone acts as a tympanic membrane in the human ear. When you talk to it, the film will vibrate and the film is connected with a small coil (note: this coil will vibrate with the film) In the position of the change, there is a small piece of fixed permanent magnet (fixed on the microphone casing) in the microphone. The film is elastic and generally acts both as a vibration and as a function of pulling the coil back to its original position. The film is attached to the microphone housing at one end and to the coil at one end. When the film vibrates, the coil is vibrated, and the relative position of the coil and the permanent magnet changes, which causes the magnetic field passing through the coil to change. When the magnetic field changes, an induced electromotive force is generated in the coil, and a current is generated. Specific sounds have specific vibrations, and specific vibrations produce a specific form of current. So the microphone "codes" the sound into a form of current. The principle of the earpiece is probably the reverse process of the microphone, and the structure is almost the same. There is also a film in the earpiece, the film is connected to a coil, and there is also a permanent magnet. A specific form of current (such as the current that the microphone just "coded") flows through the coil of the earpiece, which causes the magnetic field generated by the coil to change, so the magnetic force between the permanent magnet and the coil changes, so the distance between the permanent magnet and the coil Will change. This drives the film to vibrate and make a sound. The speaker is also called "horn". It is a very common electro-acoustic transducing device, which can be seen in audible electrical and electronic equipment. Composition A speaker is a transducing device that converts an electrical signal into an acoustic signal. The performance of the speaker has a great influence on the sound quality. The speaker is one of the weakest devices in audio equipment, and it is the most important component for sound effects. There are many different types of speakers, and the prices vary greatly. Audio power passes through electromagnetic, piezoelectric or electrostatic effects, causing the cone or diaphragm to vibrate and resonate (resonate) with the surrounding air to produce sound. Low-grade plastic speakers have a thin body that cannot overcome resonance, and there is no sound quality (some partially designed plastic speakers are far better than inferior wooden speakers); wooden speakers reduce the sound of the box resonance. Sound quality is generally better than plastic speakers. Usually the multimedia speakers are dual-unit two-way design, one smaller speaker is responsible for the mid-highs output, and the other larger speaker is responsible for the mid-bass output. The selection of speakers should consider the material of these two speakers: the tweeter of the multimedia active speaker is now dominated by the soft dome (in addition to the titanium dome for analog sources), it can reduce the high frequency with the digital source. The hard feeling of the signal gives a gentle, smooth and delicate feeling. Multimedia speakers are now dominated by soft ball tops such as better quality silk films and lower cost PV films. The woofer determines the characteristics of the sound of the speaker. It is relatively important to choose. The most common ones are the paper cones, the plastic paper cones, the paper-based wool basins, and the tight-pressing basins. The color of the paper cone is natural, cheap, good rigidity, lighter and lighter. The disadvantage is that the moisture resistance is poor and the consistency of manufacturing is difficult to control. However, the top-level HiFi system is made up of paper cones, because the sound output is very average. Good reduction. Common speaker Bulletproof cloth, with wide frequency response and low distortion, is the first choice for those who love strong bass. The disadvantages are high cost, complicated production process, low sensitivity and light music. Wool woven pot, soft texture, it is very good for soft music and light music, but the bass effect is not good, lack of strength and shock. PP (polypropylene) basin, which is widely used in high-end speakers, with good consistency and low distortion, and all aspects of performance are remarkable. In addition, fiber-like diaphragms and composite diaphragms are rarely used in popular speakers due to their high price. The larger the speaker size, the better. The large-diameter woofer can perform better in the low-frequency part, which can be selected during the purchase. Speakers made with high-performance speakers mean lower transient distortion and better sound quality. Ordinary multimedia speakers woofer speakers are mostly between 3 and 5 inches. Speakers made with high-performance speakers also mean lower transient distortion and better sound quality. Our most common electric cone cone speaker. Electric cone-shaped speakers are often used as paper cone speakers in the past. Although the diaphragm is still dominated by paper cones in 2014, many polymer material diaphragms and metal diaphragms have appeared at the same time. Actually. Conical cone speakers are mainly composed of magnetic circuit system (permanent magnet, core column, magnetic guide plate), vibration system (paper cone, voice coil) and support auxiliary system (centering piece, basin frame, cushion). Partial composition. 1. Voice coil: The voice coil is the driving unit of the cone cone speaker. It is wound on the paper tube in two layers with a very thin copper wire. It is usually wound around several tens of turns, also called a coil, placed on the magnetic core column. The magnetic shielding plate formed by the magnetic conductive plate. The voice coil is fixed with the paper cone. When the sound current signal enters the voice coil, the voice coil vibration drives the paper cone to vibrate. 2. Paper cones: There are many types of materials used for the cone diaphragm of cone cone speakers. There are two types of natural fibers and man-made fibers. Natural fibers are usually made of cotton, wood, wool, silk, etc., and rayon is made of rayon, nylon, glass fiber, and the like. Since the paper cone is the sound radiating device of the speaker, the sounding performance of the speaker is determined to a considerable extent. Therefore, no matter which kind of paper cone is required, it is required to be light in weight and good in rigidity, and cannot be deformed due to changes in ambient temperature and humidity. . 3. Folding ring: The folding ring is set to ensure the axial movement of the paper cone along the speaker and to limit the lateral movement. At the same time, it acts to block the front and back of the paper cone. In addition to the material of the paper cone, the material of the folding ring is also bonded to the paper cone by heat pressing using plastic, natural rubber or the like. 4. Centering piece: The centering piece is used to support the joint of the voice coil and the paper cone to ensure that it is vertical and not skewed. There are many concentric rings on the centering piece, so that the voice coil can freely move up and down in the magnetic gap without lateral movement, ensuring that the voice coil does not touch the magnetic plate. The dust cover on the centering piece is to prevent the external dust from falling into the magnetic gap, avoiding the friction between the dust and the voice coil, and causing the speaker to produce an abnormal sound. Speaker construction The general speaker is composed of: magnet, frame, centering piece, and folding ring cone type paper cone. As shown Speaker construction The earpiece is a kind of accessory that transmits sound through communication tools such as telephones, walkie-talkies, and mobile phones. It is a kind of speaker, but it is generally not called a speaker. The term generally is used to describe parts of an electronic product that transmit sound. Such as: mobile phones, walkie-talkies, and so on. A speaker is a transducing device that converts an electrical signal into an acoustic signal. The performance of the speaker has a great influence on the sound quality. The speaker is one of the weakest devices in audio equipment, and it is the most important component for sound effects. There are many different types of speakers, and the prices vary greatly. Audio power passes through electromagnetic, piezoelectric or electrostatic effects, causing the cone or diaphragm to vibrate and resonate (resonate) with the surrounding air to produce sound.
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The difference between the handset and the speaker
earpiece