The listening approach that uses a parametric array loudspeaker system on a mobile phone is proposed, and the acoustic characteristics of a mobile-phone-size super-directional loudspeaker prototype are reported. The prototype has two sets of parametric loudspeakers that emit narrow ultrasonic beams that are demodulated into audible frequencies by the nonlinearity of air. Using an ultrasonic carrier wave amplitude-modulated by audible frequency, we realize audible sound pressures above 70dBSPL at the distance of 50cm, and also confirm the high directivity of the sound field. With the small-size super-directional loudspeaker, it is possible to provide a personal sound field for hands-free playback in mobile environments.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.