What is a cable digital TV set-top box?
The cable digital TV set-top box is the device that we must use to watch the cable digital TV. It looks like a DVD player. It is designed to receive digital television signals and then "turn hands" to the television to play it out.
What is a cable digital TV smart card?
The digital television smart card is a core component of the digital television system and needs to be used in conjunction with a set-top box. Its main function is to provide user identification, secure storage, decryption and authorization, and control of access rights. Through this card, you can choose to watch cable digital television. program.
Compared with traditional analog TV, what are the advantages of digital cable TV?
(1) Content is more exciting: More public television, pay TV, video on demand and information services are provided.
(2) The program is more personalized: hundreds of professional pay-TV programs are tailor-made for you, and video-on-demand allows you to enjoy your favorite movies and TV shows at any time.
(3) More convenient viewing: The unique electronic program guide provides you with an electronic version of the television program report. Interactive digital TV not only can be on-demand in real time, but also can fast forward, rewind, just like watching a DVD.
(4) The image is clearer: The resolution of the digital TV screen can be comparable to that of the DVD, and the sound is more vivid and beautiful.
(5) Channels are more abundant: The digitalization of cable TV has fully released the spectrum resources. Analog TVs can generally only transmit about 50 sets, while digital TVs can transmit more than 500 sets of television programs.
Cylindrical lenses are only used to provide focusing ability in one part. Used to illuminate or detect light from a linear light source. It is also used for deformation and compression of beams and images. Especially widely used in LD (laser diode) output beam deformation compression. Cylindrical lenses and components are used in a wide range of industries. Some industrial sectors that often use cylindrical lenses are: industrial inspections. Examples include laser scanning optical metrology systems, laser alignment and inspection tools, and laser additive manufacturing and laser processing equipment. Semiconductor manufacturing. In the entertainment industry, cylindrical optical components are used in digital cinema cameras to compress widescreen images, making them suitable for standard 35mm film and digital/laser projectors to stretch and compress images so that they can be viewed normally when projected onto a widescreen. In life sciences and medicine, cylindrical lenses are used in various life science imaging and medical testing instruments.
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