Acoustic news.
I recently met an interesting person who told me many interesting things about new items in the field of acoustics. After collecting the information, I decided to share a couple of finds with habrauser.
Audio Spotlight Spotlights
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Audio Spotlight speaker system allows you to transmit sound in a specific area of ​​space, outside of which the audibility of sound is reduced to almost zero. The audio converter is a circle with a diameter of 30 cm and a thickness of 1 cm, the divergence of the sound beam lies within three degrees.
The ASL system, designed by American scientists, consists of an equalizer and an ultrasonic speaker. The equalizer processes the original signal and transmits it to a non-linear processor, making the necessary predistortion. The output signal on small speakers modulates ultrasound (with a frequency of 40-80 kHz), which, spreading in the air, "reveals" at the same time an audible component embedded in the original signal. An audible sound is formed directly in the air as a hologram.
The feeling when you listen to ASL is as if the sound is directly transmitted to your head. The effect is quite entertaining;) This joke is fixed, as a rule, above the head.
Typical applications of such projectors: equipment of museums and exhibition halls, dubbing in auto-autopsy, use in “smart houses”.
In Russia, the implementation of such projectors is engaged in the company RIWA .
Audio Spotlight Spotlights
')
Audio Spotlight speaker system allows you to transmit sound in a specific area of ​​space, outside of which the audibility of sound is reduced to almost zero. The audio converter is a circle with a diameter of 30 cm and a thickness of 1 cm, the divergence of the sound beam lies within three degrees.
The ASL system, designed by American scientists, consists of an equalizer and an ultrasonic speaker. The equalizer processes the original signal and transmits it to a non-linear processor, making the necessary predistortion. The output signal on small speakers modulates ultrasound (with a frequency of 40-80 kHz), which, spreading in the air, "reveals" at the same time an audible component embedded in the original signal. An audible sound is formed directly in the air as a hologram.
The feeling when you listen to ASL is as if the sound is directly transmitted to your head. The effect is quite entertaining;) This joke is fixed, as a rule, above the head.
Typical applications of such projectors: equipment of museums and exhibition halls, dubbing in auto-autopsy, use in “smart houses”.
In Russia, the implementation of such projectors is engaged in the company RIWA .
Source: https://habr.com/ru/post/3658/
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