speaker Electroacoustic transducer
Speakers are also known as "speakers". Is a very common electro-acoustic transducer, in the sound of electrical and electronic equipment can see it. The loudspeaker is the weakest device in the audio device, and it is one of the most important parts for the sound effect. Although it is such a simple device, its development is not overnight, but after a long study and countless people's efforts, and gradually mature and progress. The invention of the speaker is to be able to make "the original sound to reproduce", but despite the efforts of countless scientists, this goal has not yet fully achieved, but is a different way of sound, different manufacturing methods and materials used, making the horn, The world 's most brilliant and splendid garden. The speakers are divided into built-in speakers and external speakers. External speakers that are generally referred to the speaker, built-in speaker is the MP4 player with built-in speaker. Many types of loudspeakers, according to their conversion principle can be divided into electric (ie, moving coil), electrostatic (ie, capacitive), electromagnetic (ie reed), piezoelectric (ie crystal) The
The electric speaker is a patent for loudspeaker protested by Ernst W. Siemens (founder of Siemens & Halske) on January 20, 1874. Such a loudspeaker is in such a way that the voice coil with the support system is in the magnetic field in order to keep the vibration system in axial motion. Was mainly used for the relay rather than the speaker field. On December 14, 1877, Siemens applied for a horn patent, attached to a moving voice coil above a parchment as a sound radiator, parchment can be made into an index-shaped cone shape, which is the first phonograph era type.
In 1898, the British Oliver Lodge further in accordance with the principle of the telephone microphone invented the cone speaker, and we are familiar with the modern speakers are very similar to the invention determines the 99% of the structure of the modern moving speakers lan called "roaring phone". But this invention can not be used, because until 1906 Lee De Forest was invented a three-pole vacuum tube, and made available expansion machine is a few years later, so the cone horn to the 1930s to gradually popularize.
After a full 25 years, in the 1920s, radio appeared. C. W. Rice and E. W. Kellogg published the epoch-making paper "New Non-Shotted Unit", which details the direct radiant loudspeaker, and the Radiola 104 speaker designed with this theory swept the United States.
In the past few decades, the basic principles of electric speakers have not changed, but improved design details and parts. Frequency range and other aspects of the dynamic range of older products have developed by leaps and bounds. Electric speakers to simple structure, excellent sound quality, low cost, dynamic has become the mainstream of the current market.
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