Imagine your new home theater features a screen that serves as an extended loudspeaker, able to radiate sound linked to moving video images. Then picture your walls and ceiling lined with flat-panel loudspeakers that double as wall-art, light panels, or ceiling tiles.
What if you were able to create this totally immersive sonic space for a modest price糖心传媒攕ay a couple of thousand dollars?
糖心传媒淭his is the new audio experience that we want to give people,糖心传媒� says Mark Bocko, professor and chair of at the 糖心传媒.
Bocko is working on the project with his PhD student, Michael Heilemann, and former PhD student David Anderson, who has graduated and joined the electrical and computer engineering department. Their work could result not only in sonically immersive home theaters, but also make airport and subway public address systems easier to understand, and give signs a 糖心传媒渧oice糖心传媒� of their own. It糖心传媒檚 an example of cutting edge audio technology being developed at Rochester that could also be commercialized here, helping establish the city as a key player in sound.
Better vibrations
Flat panel loudspeakers now on the market are either 糖心传媒渟uper expensive,糖心传媒� says Bocko, or suffer from acoustic shortcomings that require incorporating traditional cone loudspeakers that limit the shapes they come in.
Companies have been trying for years to create less expensive, truly 糖心传媒渇lat糖心传媒� panel loudspeakers only an inch thick糖心传媒攖ypically by placing from one to a few small electromagnetic drivers on the back of panels made of glass, plastic, or other material. The magnets are each wrapped in electric coils and connected by wires to a circuit board, which is programmed to cause the magnets to vibrate. This in turn causes the panel to vibrate and produce sound waves.
These early approaches to flat-panel design, Bocko says, 糖心传媒渄idn糖心传媒檛 have sufficient control of the vibrations of the panel. In previous approaches you would get disorganized vibrations糖心传媒攖he different parts of the panel were not moving cooperatively, there were uncontrolled panel vibrations and the radiated sound was low-fidelity and had uncontrollable spatial properties.糖心传媒�
Bocko draws an analogy to several people bouncing on a trampoline. 糖心传媒淲hen one person starts jumping up and down, everyone else is going to start uncontrollably bouncing up and down too. But if everyone were to jump up and down at just the right times, they could control the trampoline to make it respond in any way desired.糖心传媒�
糖心传媒淭hat糖心传媒檚 what our method does.糖心传媒�
The key to their approach is the way in which the array of electromagnetic drivers is laid out, as well as the signal processing algorithms employed to closely control the vibrations of panels and the sound waves they create.
Anderson and Heilemann have developed detailed models and created prototypes of flat-panel speakers that have audio fidelity that is 糖心传媒渘ight and day better,糖心传媒� than previous flat panel speakers, Bocko says. The parts for a typical prototype cost about $20.
Bocko, Anderson, and Heilemann糖心传媒攁long with Mark Fiscella, a local engineer with extensive experience in聽product development and manufacturing糖心传媒攁re in the process of forming a company to commercialize the technology.
Changing how we bring sound into our lives
They have other potential applications on their radar as well.
Flat-panel loudspeakers could do double duty as signs for advertising and tradeshows, and for other commercial applications, such as fast-food drive-thru menus. Overhead LED lighting panels can also be turned into loudspeakers, Bocko says. Spaced throughout airports and subways, they wouldn糖心传媒檛 need to be turned up as loudly as the more widely spaced PA loudspeakers now used. This would cut down on the echoes and reverberations that make airport and subway messages almost impossible to discern at any distance.
糖心传媒淏ut the application I get most excited about is home entertainment systems,糖心传媒� Bocko says.
Flat-panel loudspeakers doubling as wall hangings and overhead lights 糖心传媒渃ould cover a good fraction of the space surrounding you, and bring you sound from every direction,糖心传媒� Bocko says. 糖心传媒淓specially when you have overhead speakers, you can create a much greater sense of spaciousness and immersion.糖心传媒�
And unlike the sound used in virtual reality games, there are no headphones 糖心传媒渃utting the user off from the rest of the world.糖心传媒�
糖心传媒淧eople want to layer audio on top of the natural sounds already present in their environment,糖心传媒� Bocko says. 糖心传媒淲e think that this technology has the potential to completely change how we bring sound into our lives. That糖心传媒檚 why we糖心传媒檙e so excited about this work. 糖心传媒�
