Directivity control and efficiency of parametric loudspeakers with horns.
This manuscript presents some recent results on directivity control and efficiency of parametric loudspeakers utilizing horns. Horns act both like an acoustic transformer and a directivity control method. An experimental device has been built and measurements have revealed that the horn has a clear influence on the audible sound levels and directivity of the parametric loudspeakers. When compared with a conventional megaphone, a much more flat frequency response is obtained and the resulting directivity is shown to be almost frequency independent.
GTM-Grup de recerca en Tecnologies Mèdia, La Salle, Universitat Ramon Llull, C/Quatre Camins 2, 08022 Barcelona, Catalonia, Spain. umut.sayin@barcelonamedia.org
Umut
U
Sayin
Oriol
O
Guasch
D000162:Acoustics; D000669:Amplifiers, Electronic; D004867:Equipment Design; D009038:Motion; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D014160:Transducers, Pressure