At present, most of the speakers are still sounding the traditional cone-type monomer before and after exercise, more academic argument, these speakers called electric (Electrokinetic Dynamic) or Dynamic (Moving Coil). As early as 1877 the German Siemens Erenst Vemer gained the moving-coil loudspeaker patent, but as late as 1907 vacuum tube was formally used, and Edison's first phonograph needle is directly contributing to the diaphragm and then by amplifying horn sound, so Siemens patent has no access. 1920 America's singular Chester Rice and Edward Kerrog Edison Bell PGHokuto there was first developed a practical moving-coil loudspeaker, seventy years, in addition to materials continue to improve, but you remember the horn science and technology really progress? Here are some common speaker sound manner: First, the moving coil. The basic principle from Fleming's left hand rule, the current channel has a line perpendicular to the magnetic lines of force between the magnets into the north and south poles, said line will be moved by the interaction between the magnetic field lines and current in the one attached to the diaphragm this root bead line with the current changes produced on the diaphragm before and after exercise. Currently more than ninety percent of the monomers are cone moving coil design. Second, the electromagnetic. In the middle of a U-shaped magnet erect movable cut iron (armature), when the current flows through the coil and the armature will be affected by magnetic repulsion magnet suction phenomenon, and while driving diaphragm movement. Cheap but ineffective this design costs, so the phone is used in a small tube and headset. Third, inductive. And electromagnetic principles are similar, but the armature doubled, while the two voice coil magnet and asymmetry, when the signal current through the armature for two different magnetic flux will push each other to exercise. Is different is that the electromagnetic inductor can be regenerated less frequently, but it is very inefficient. Fourth, electrostatic. The basic principle is the Coulomb (Coulomb) law, usually plastic mass diaphragm plus aluminum and other materials inductive vacuum vaporization process, two diaphragms placed face to face, which when coupled with a positive current high voltage is induced when another piece a small current, attracted each other by pushing air repulsion can sound. Electrostatic monomer dispersed due to the lightweight and vibration is small, so it is easy to get crystal clear treble, bass dynamic skills needed, but it is not efficient, and easy to use original DC to gather dust. Currently vendors such as Martin-Logan has successfully developed static and dynamic hybrid speakers to address the problem of insufficient electrostatic body bass, on the use of electrostatic headphones is also very extensive. V. planar. First developed by Japan SONY out design, it is still moving coil voice coil design theme, but the cone diaphragm into the diaphragm plane honeycomb structure, because fewer people Cavity Effect, features better, but the efficiency is low . Sixth, ribbon type. No traditional voice coil design, the diaphragm is made of very thin metal, the current flows directly into the path body to vibrate pronunciation. Because it is the voice coil diaphragm, so the quality is very light, it can temporarily be returned excellent high-frequency response is also very good. However ribbon horn efficiency and low impedance of the amplifier has been a great challenge, Apogee can be represented. Another way is to have the voice coil, the voice coil is directly printed on the plastic sheet, which can solve part of the problem of low impedance, Magnepang such a design leader. Seven horn. Diaphragm promote an air horn at the bottom and work, because the proliferation of so sound transmission is not very efficient, but the horn shape and length will affect the sound, low frequency is not so easy to be replayed, now mostly used in massive PA system or the tweeter, the United States is the old Klipsch horn speaker manufacturer. Eight Others include Dr. Hale developed in 1973 ribbon style improved design, called Hale horn, very good in theory, users in Taiwan is very scarce. Titanate piezoelectric using a piezoelectric material, so that a voltage extension or contraction pronunciations design, Pioneer once high piezoelectric polymer modified design for use on their tweeter. Ion Speaker (Ion) is the use of high voltage discharge of air quality only become charged, subjected to the AC voltage of these molecules will be free of charge due to vibration and sound, can only be used in high frequency above monomers. Philips has developed horn active feedback (MFB), built-in speakers have active feedback circuit, can significantly reduce distortion.
Several Speakers Sound Pattern
- Sep 21, 2016-