G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
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Engineering & Computer Science
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Computer Networks & Wireless Communication
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Physics & Mathematics
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General Physics & Mathematics
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Radar, Positioning & Navigation
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Remote Sensing
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Measurement Of Mechanical Vibrations Or Ultrasonic Waves
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Procédés et dispositifs pour atténuer les bruits d'origine externe parvenant au tympan et améliorer l'intelligibilité des communications électro-acoustiques
Microphone sonde comprenant un transducteur acoustique avec une cavite a laquelle sont raccordes un tube de sonde et un tube d'adaptation d'impedance
Procede de reproduction de sons et enceinte en vue de sa mise en óoeuvre en vue de couvrir une large bande passante et d'avoir un faible taux de distorsion.