A study on acoustic beam steering with parametric loudspeaker based on individual delay-filtering for carrier and sideband waves - Masato Nakayama; Takanobu Nishiura; Ryota Okuno; Noboru Nakasako (2014 IEEE Asia Pacific Conference on Circuits and Systems, APCCAS 2014, Ishigaki, Japan, November 17-20, 2014, 2014)