The sounder by electricity, and the like or bell or buzzer chime speakers other than these, it is intended to generate a loud sound, such as a warning sound, a melody, which is fixed and sound frequencies fixed it is common to generate the. Speaker is intended to be reproduced as sound waves back to the original, the electrical signals converted by the microphone and the natural sound such as voice or instrument sound to it.
Therefore, it is designed from the need to convert to the waveform of the sound faithfully waveform of the input electrical signal, such as distortion or noise is not applied as much as possible to the sound that is generated. Now sometimes it is used to play a sound, the sound made as an electrical signal directly in a variety of ways (electronic music).
Speakers, playing faithful sound to the original sound more to tell far in the big sound on the fly music and human voice "loudspeaker" (megaphone, wearable speakers), and radio and television receivers, and mobile phones, and music it is incorporated into a variety of audio products up to the high-end audio equipment for, there are many forms according to the purpose of each.
Rather than the diaphragm of the specific, such as cone paper, and speakers that diaphragm what wall the house installed, floor, flower ceilings and other motor vehicles such as resonance (such as heat-resistant resin case input of the piezoelectric vibrator) vibrating body directly is.
There is also a speaker to generate sound without using a diaphragm as Samohon and (ionic form) Speaker discharge. Discharge type speaker intended to use the vibration of air generated in the high-frequency discharge, is characterized by transient response that is superior. By using the thermal acoustics, Samohon to generate sound using a change in pressure due to thermal fluctuations periodic. It has been long forgotten because it did not provide sufficient sound pressure, but applications such as sheet-like speakers have been studied due to the invention of new materials such as carbon nanotubes.