Flat speakers

from Wikipedia, the free encyclopedia

The flat panel loudspeaker , also known as a soundboard, is a type of loudspeaker that is attached to surfaces and makes them vibrate. For this purpose, voice coils are attached to a panel , which receive an electrically amplified sound signal and transmit it to the respective surface.

principle

The soundboards are attached to surfaces, which then cause the surface material to vibrate by means of structure-borne sound transmission. This creates a "sound barrier" that serves as an invisible loudspeaker. The resulting timbre is acoustically equalized in order to be able to adapt the sound to spatial conditions and the carrier material used. The locations for good flat-panel loudspeakers range from normal walls (e.g. plasterboard ) to wood paneling, glass surfaces, tiles and mirrors. The prerequisite for good sound properties of flat-panel loudspeakers are single-layer surfaces that are as homogeneous as possible , since each additional layer (e.g. in the case of double-glazed panes) absorbs sound waves.

application

Flat-panel loudspeakers can be installed in rooms on the side walls as well as in the ceiling and theoretically also in the floor. This makes them suitable for use in small rooms (bathroom, toilet) as well as in medium-sized rooms (living rooms) as well as in large rooms (seminar rooms, restaurants). Flat-panel loudspeakers are also well suited wherever walls with hollow spaces are used in structural terms (e.g. in boat building).

advantages

A major advantage of flat panel loudspeakers is that they are built into walls and are therefore not visible. This comes into play wherever loudspeaker boxes and / or cables are not optically desired or necessary. Furthermore, due to the wide angle of radiation of the sound waves of up to 180 degrees, they create a spatial sound image - even in a stereo arrangement. In addition, the emitted sound is carried further than with isolated sound sources such as boxes.

technology

So-called exciters are used in panel loudspeakers or soundboards . The sound generation takes place according to the principle of the bending wave converter . The coil is attached to a carrier plate and makes it vibrate. The sound waves propagate on the surface by means of structure-borne sound transmission and form a sound field in the room. The input signal is processed by amplifiers , which ideally should have a digital signal processor (DSP) in order to be able to generate an acoustically optimal sound result.

literature

  • Patent EP1169884 : Flat Surface Loudspeaker And Method For Operating The Same. Released January 9, 2002 . ‌

Web links