耳机性能指标（Earphone performance index）.docVIP

耳机性能指标（Earphone performance index） What are earphones? What are they? Headphones, commonly known as receivers, are audio, electrical signals converted to sound waves, and can be closely coupled with the ear electroacoustic transducing device. Headset The text symbol used to be EJ, and now its B. Its largest use is characterized by no interference with others, but also portable, audio source And easy to drive, especially with the advent of CD, MD, DAT, and Walkman, with high fidelity headphones The pushing stage makes the distortion lower and the tone more pure. Headphones in the frequency response, distortion and other aspects are speakers, speakers can not Comparative. Listening to music with headphones is like playing in the middle of a band. It works very well. Many types of headphones, according to the principle of energy conversion to distinguish, there are electromagnetic, electric, voltage type, electrostatic type, etc., by conduction There are two ways to distinguish between air conduction and bone conduction. The former is commonly used as an earphone Plug in (also known as earplug machine), ear hanging, etc., in which headphones are most commonly used, according to performance to distinguish, there are closed type, Semi open and open, etc.. Common headphones can be divided into two broad categories: high resistance headphones and low resistance headphones. High resistance headphones can also be split into head style High resistance headphones and high resistance earplug machine two kinds. Wearing the headset of the high impedance resistance often 1kQ ~ 4kn, and a high resistance earphone impedance All are 800kQ. Low resistance headphones can be divided into two types: head type low resistance headphones and low resistance earplug machines The resistance is generally 16Q, 25Q, 32Q and 60Q, stereo headphones are in this category; low impedance earplug machine impedance in general For 8Q, if you use two such low resistance earplug machines, you can also use s