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New generation of digital loudspeakers with ultra-flat enclosures.

A new generation of loudspeakers for digital signals will be
studied, prototypes will be developed and new mass
production technologies will be designed.

Audio frequencies are the frequencies of sounds perceptible by the average normal human ear. All sounds are produced by mechanical vibrations. A vibrating body alternately compresses and expands the air in its vicinity, and these condensations and rarefactions are transmitted to neighbouring air particles. Some of the energy of a vibrating body is therefore transmitted away to a hearing mechanism of a living creature at a distant point. Electronically produced or amplified sound is a common - some might even say dominant - component of the modern acoustic environment. The loudspeaker, the end of the electronic chain, is simply a vibrating diaphragm that is electrically driven. A voice coil situated within or surrounding the magnetic field is energized by the electrical signal. Hence a variable magnetic field is generated in the coil, and the coil is alternately attracted to and repelled from the magnet. The coil is linked to a diaphragm, which vibrates and causes the surrounding air to vibrate and re-creating the original sound. A loudspeaker, or speaker, is therefore nothing else than one of several devices that convert electrical energy into mechanical energy. Such devices are called electro- mechanical transducers. Most speaker transducers, known as drivers, require also a surrounding structure called an enclosure to efficiently transfer sound energy to the surrounding air. The digital approach to recording or describing the behaviour of audible sounds differs from that of analogue technology mainly in the consideration of time. In analogue technology, time is continuously observed, whereas in digital technology, time is sampled. The use of digital technology in an analog environment is becoming more common. Sound has usually been transmitted and preserved in analogue form. However, CDs as well as CD-ROMs and DVDs are today digital storage devices that are replacing analog phonograph records, among other things. Compact discs are less susceptible to the encoding of unwanted sounds and to physical damage. In the modern telephone system, numerous conversations can now be placed in digital form, bundled together using a different time frame, transmitted by wire or optical fibre, and then unpacked to be sent to individual receivers. The science of engineering, and the art of generation and propagation of digital audio signals and sound waves constitute the subject of this project. Also, a great impact on the control of unwanted vibrations and noise in the environment is expected. Scientist and engineers of the three project partners involved will develop and test the special software, audio transducers and enclosures specially designed for the digital audio technology of tomorrow. Keywords: digital loudspeakers, array software, sound enclosures.
Acronym: 
LAURIN
Project ID: 
2 708
Start date: 
01-09-2001
Project Duration: 
60months
Project costs: 
40 000 000.00€
Technological Area: 
Sound Engineering/Technology
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.