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G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
G10K11/18—Methods or devices for transmitting, conducting or directing sound
G10K11/26—Sound-focusing or directing, e.g. scanning
G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
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FR23865A1917-08-031917-08-03Système d'appareil de réception et de transmission des ondes sonores
ExpiredFR23865E
(fr)
Appareil pour la transmission et la reproduction d'ondes acoustiques, pour la phonocinématographie, le photogramophone et des applications analogues