The piezoelectric transducers (for External
Drive) produce exceptional sound output and efficiency all while meeting each
customers unique performance requirements. Piezo transducers are constructed
without magnets, instead they create sound mechanically via the piezoelectric effect.
Our piezo transducers are not equipped with a built in drive circuit. This
provides our customers with the flexibility of designing their own circuitry to
meet their specific needs. The advantage of using an external drive circuit is
that the piezo transducers can output sounds at multiple frequencies. Full
bridge circuits ramp up SPL for more peak-to-peak voltage, making our piezo
transducers a high output solution.
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Today's facial software recognition is already very powerful, just a photo or a video, they can identify the characters in the image based on the information in the database. But if you don't want your face to be recognized by the software, then there is no way. At this year's MWC, software security company AVG brought a "private glasses" that would make facial recognition software inoperable.
The working principle of this pair of glasses is mainly to use the infrared LED to "move", so that most of the filters used in the camera can not work properly. These led lights can blur the light around the wearer's glasses and nose, which is enough to prevent facial recognition software from detecting his identity. If the flash is turned on in the shooting device, the privacy glasses also respond with a reflective overlay function.
This pair of privacy glasses is still in the prototype test stage, so the work effect is not stable. At the scene, the results obtained by the testers using the iPhone, Nexus and SLR are not the same. AVG said that they are only experimenting with the idea, which means that the pair of glasses will not enter the market for sale soon.
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