Audio equipment, electro-acoustic technology history dates back to the 19th century by Thomas Edison invented the phonograph and the Bell telephone carbon microphone for the beginning of 1881 it has been connected with two pairs of headphones carbon microphone, made a two-channel stereo transmission performance. About the first time in 1919, tube amplifiers and electromagnetic speakers made a sound experiment. Scientists to apply the results of mechanical and electrical aspects of the research field of electro-acoustic, so there is a theoretical basis for electro-acoustics. With the electro-acoustic transducer development of the theory, a more comprehensive types of electro-acoustic sound equipment and electro-acoustic measurement instrument after another, contributed greatly to the development of electro-acoustics.
Electro-acoustic converter is to convert sound energy into electrical energy or electrical energy into sound energy of the device, its research is an important element of electric acoustic branch. A variety of electro-acoustic transducer, although its type, function, or different working conditions, they contain two basic components, namely, electrical systems and mechanical vibration system. Within the transducer, electrical systems and mechanical vibration systems linked by a physical effect, to complete the conversion of energy; the outside of the electrical transducer signal generator system and the output circuit, or pre-amp match the input circuit; and mechanical vibration transducer system, with its vibration and sound field to match the surface. Therefore, electro-acoustic transducer design should also take into account the power - power - the sound of three systems.
Electro-acoustic field of electro-acoustic technology is faster than the development of a branch, in the political, military and cultural fields have a wide range of applications within the. If applied to wired or wireless communication systems, events venue and a wired or wireless broadcast systems, stage lighting, theater sound reinforcement; studio, high-fidelity playback systems; also used in the development of language in the voice-control technology; and speech recognition acoustic measurements and other new technologies. Overall, including recorded burst technology, sound technology, and their associated electro-acoustic instruments and electro-acoustic testing technology.
Aloud technique is a system that only tape drives, CD-ROM machine sound source, there is no microphone, no audio feedback. It examines the main problems is the original sound source recorded excellent sound quality, how to replay the sound system, to maintain the original appearance of the ability of sound signals, including audio signal and processing the necessary landscaping. It is the sound system a special case.
Sound technologies include: a sound source and its surroundings (the stage set up at the venue), the acoustic signals into electrical signals of the microphones, signal amplification and signal processing equipment, transmission lines, the electrical signals into acoustic signals The speakers and audience area acoustic environment. Sound different from the burst is that the same sound at the microphone and speaker inside, so sound system is a feedback system, in the channel gain is large enough, the system will lose stability and the transition to self-oscillating state, resulting in whistle . So in addition to sound reinforcement technology for processing sound signals beautification, the sound system in order to improve the maximum power gain, improved sound quality and stability of the system, measures must be taken to suppress acoustic feedback caused by sound distortion.
Now, with computer multimedia technology and network technology, electro-acoustic technology for stage sound, programming, public address broadcast control, has become a radio and television, audio and video publishing, audio rental, online media, multimedia and sound creative opening ceremony key technology areas. Seen in the last hundred years of development process, the sound is electro-acoustic technology, the core technology.