In addition to the basic TV live broadcast function, telecom TV can also realize live broadcast on demand, time shift and entertainment interaction. With the development of technology, telecom TV is also moving towards a higher quality audio-visual experience, and IPTV has also been released recently. 4K ultra HD set-top box, supporting ultra HD 4K programs, Blu-ray HD videos, 3D games, etc.
Pdf error code recognition principle:
To convert the bar code compiled according to certain rules into meaningful information, it needs to go through two processes: scanning and decoding. The color of an object is determined by the type of light it reflects. White objects can reflect various wavelengths of visible light, while black objects absorb various wavelengths of visible light.
According to different principles, scanners can be divided into three types: light pen, CCD and laser. The electrical signal is output to the amplification circuit of the barcode scanner to enhance the signal, and then sent to the shaping circuit to convert the analog signal into a digital signal. The widths of white bars and black bars are different, and the duration of corresponding electrical signals is also different. Then the decoder judges the number of bars and spaces by measuring the number of pulse digital electrical signals 0, 1.