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Method of controlling output of ultrasonic speaker, ultrasonic speaker system, and display device

A method of controlling an output of an ultrasonic speaker that reproduces audible-frequency-band signal sounds by modulating carrier waves with audible-frequency-band signal waves output from a signal source and driving an ultrasonic transducer with the modulated waves includes: dividing the audible-frequency-band signal waves into a plurality of frequency bands; separately adjusting amplitudes of the signal waves and amplitudes of the modulated waves in the respective frequency bands; and driving a plurality of ultrasonic transducers provided corresponding to the respective frequency bands with the modulated waves generated corresponding to the respective frequency bands. Band-corresponding volume setting data, which is used to set volume of the ultrasonic transducers corresponding to the respective frequency bands by means of a plurality of band-corresponding volume setting units provided corresponding to the respective frequency bands, and overall volume setting data, which is used to set volume in common with respect to the plurality of ultrasonic transducers by means of an overall volume setting unit, are provided. Gains of modulated wave amplitude adjustment units that adjust the amplitudes of the modulated waves in the respective frequency bands are determined corresponding to the respective frequency bands on the basis of a combination of the band-corresponding volume setting data and the overall volume setting data.
Owner:SEIKO EPSON CORP

Charging, exchanging and configuring management networking system of vehicle power battery

The invention discloses a charging, exchanging and configuring management networking system of a vehicle power battery, relating to the technical field of battery charging, electronic tag and computer networking. According to physical distribution transportation radius for battery distribution, the supply center (comprising traditional supply systems and supply systems of various renewable energies, such as wind energy, solar energy and the like) of a power grid is provided with hundreds and thousands of large professional battery charging stations (or in charge by battery production enterprises); distributed battery exchange and distribution stations with equivalent amount with the existing gas station are arranged within an irradiation range; according to an identifiable mark on the battery, such as the networking information of an electronic tag (or bar code), and the dynamic requirement on the battery exchange and distribution stations, the battery is transported to the battery exchange and distribution station from a professional charging station of the battery through an optimal path. The invention reduces use, investment and operating cost with a quick, convenient, accurate, safe, environmentally-friendly and optimal economic management mode.
Owner:黄瑛
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