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Soundlazer Parametric Speaker Shoots Sound Like a Laser Beam (video) » 24Gadget.Ru :: Гаджеты и технологии
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Use of parametric speaker for older people with dementia in a residential care setting: A preliminary study of two cases - Yuko Nishiura, Minoru Hoshiyama, Yoko Konagaya, 2018
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2022 original ultrasonic directional speaker with 40kHz frequency Parametric Speaker System for museum home theater| | - AliExpress
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