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Key Technology Of Digital TV Set-top Box
Nov 13, 2018

The digital set-top box reflects the development level of multimedia, computer, data compression coding, descrambling algorithm, encryption and decryption algorithm, communication technology and network technology. Therefore, the technical content is very high. The key technologies involved are:

(1) Multiplexing and decompression techniques: After the analog signals are digitized. The amount of information has increased dramatically, and data compression is indispensable. The MPEG-2 video compression standard is widely used in digital TV and is suitable for a variety of sharp image quality:

MPEG-4 uses an object-based compression coding method, which separates images and video into different objects, which not only improves the data compression ratio, but also implements many content-based interaction functions, providing more compression and coding for multimedia data. For a broad platform.

With the wide application of large-scale integrated circuit technology and embedded system technology, digital set-top box hardware implementation uses dedicated chip or digital signal processing (DSP, Digital Signal Processing) chip, CPU core and MPEG-2, MPEG4 transport stream demultiplexer The DVB universal descrambler, MPEG audio video decoder and NTSC/PAL encoder are integrated to form the core chip of STB. To achieve real-time demultiplexing and real-time data information processing.

(2) Downlink data demodulation and channel decoding technology: The compressed data cannot be directly transmitted on the channel, and channel coding and modulation are also required. Digital TV and value-added services that are usually transmitted in cable television networks use QAM (Quadrature Amplitude Modulation) modulation and RS (ReeDSOlomon) error correction coding.

(3) Modulation coding of uplink data: In the interactive application, three methods are generally adopted, that is, the uplink data is transmitted by using a telephone line. The uplink data is transmitted by Ethernet and the uplink data is transmitted through a wired network. Since the uplink data is much smaller than the downlink data, the modulation is often performed using the OP-SK (Quadrature Phase Shift Keying) or the 160 AM method.

(4) Web browsing technology: In order to realize the true meaning of web browsing, the cable network and the Internet connection must consider the uplink and downlink data, and must also consider running IP (Internet Protocol) on it.

(5) Real-time operating system: The operating system in the digital set-top box adopts a real-time operating system (RTOS.Real-TimeOssingSvstem). The RTOS can work in a real-time environment and occupy a small memory space. It is responsible for managing local resources and network resources. Provides basic operational functions as well as access control for devices.

(6) Middleware technology: Middleware technology, which is an open business platform, has become the core technology of interactive TV. Middleware typically consists of a Java virtual machine, a web browser, an image and multimedia module, and the like, by defining a complete set of standard application interfaces, making the application independent of the operating system and hardware platform. Make application development easier, opener and more portable, to ensure the scalability of the set-top box and the effective recovery of investment.

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