21ic Training HOLTEK's fingerprint module with advanced optical technology and thin, high-quality fingerprint image sensor provides a variety of solutions for designers who want to integrate fingerprint recognition technology into their products. The GTU series MCU with USB interface is convenient for downloading fingerprint image data to the PC. The higher-level GTM family includes a HOLTEK 32-bit ARM core microcontroller, UART/USB interface and all internal algorithms for fingerprinting operations such as registration, verification and erasure. Regardless of the requirements, from individual sensors to feature-rich modules, HOLTEK offers a range of solutions for integrating fingerprint recognition into a wide range of security products.
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main features:
"Optical Fingerprint Sensor" and "Embedded Optical Fingerprint Identification Module" based on "TrueSecureTM" 3D technology are widely used in fingerprint recognition applications using advanced optical technology. Has the following advantages.
Embedded module can be read 360 degrees, in either direction
Close to linear capacitive price, cost-effective
Face sensor, easy to use
High resolution low distortion fingerprint image
Thin and light optical fingerprint sensor
Dry finger recognition
High antistatic, durable sensor
Advanced anti-false fingerprint performance
Good quality and stability
There are two types of noise canceling headphones, active noise reduction and passive noise reduction.
The active noise reduction function is to generate a reverse sound wave equal to the external noise through the noise reduction system, and neutralize the noise, thereby achieving the effect of noise reduction. Active noise canceling headphones with noise-reducing circuits that compete with external noise. Most of them use a large head-mounted design, which can be used to block external noise by using earplugs and earphone casings, and to perform the first round of sound insulation. There is plenty of room to install active noise reduction circuits and power supplies.
Passive noise canceling headphones mainly form an enclosed space by surrounding the ear, or use soundproof materials such as silicone earplugs to block external noise. Since the noise is not processed by the noise reduction circuit chip, generally only high frequency noise is blocked, and the noise reduction effect on the low frequency noise is not obvious.
Application:
1: Business people, because of frequent business trips, especially those who travel between different cities every day, they must hate the noise in the cabin. If there is a noise-cancelling earphone, they will be able to stay away from these noises. Relax by enjoying the music.
2: The office staff also need a pair of noise canceling headphones. Sometimes when thinking about planning, listening to the sound of central air conditioning is particularly annoying, and if there are colleagues around at this time, it is even more annoying. At this time, you may wear a pair of noise-cancelling headphones to expand your thinking in music.
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Shenzhen Linx Technology Co., Ltd. , https://www.linxheadphone.com