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Products of Interest Sennheiser AudioBeam Sennheiserâs AudioBeam (see Figure 1) is a directional loudspeaker designed for use in museums, exhibitions, theme parks, and other locations in which it would be useful to focus the sound toward a precise listening area. The loudspeaker contains 150 piezoelectric pressure transducers and these output the audio signal modulated onto an ultrasonic carrier frequency. The audio output is heard at a distance from the loudspeaker, and only within the sound beam itself or if the sound is reflected off a smooth surface. AudioBeam uses wideband Amplitude Modulation and a carrier frequency of about 40 kHz. The input sensitivity is switchable from 6 dBm to â14 dBm. It features an SPL level of 75 dB (±5 dB) at 700â1200 Hz and a 4-m range. Audio input is on a balanced XLR-3F socket, with contacts metallically separated. The output is on a short circuit-proof BNC connection. The power supply automatically switches to the appropriate mains voltage in the range 110â240 V and to mains frequencies between 50 and 60 Hz. The amplifier provides approximately 90 W of power. AudioBeam measures 264 à 82 à 3, 200 m and weighs 3.1 kg. AudioBeam is listed for
Computer Music Journal – MIT Press
Published: Jun 1, 2009
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