What is a digital TV front end device? 5

Introduction to the front-end system of digital TV.

The front-end system of digital radio and television can be divided into four parts: the source part, the processing part, the transmission part and the management part. 1. Source part.

It is mainly used to produce a variety of television programs and data information, including satellite reception, telecommunications reception, self-made programs and the Internet, etc., and its main equipment includes digital satellite receivers, servers, MPEG-2 encoders, program collection and editing workstations, information servers, information collection and editing workstations, etc. 2. Processing part. It is mainly for the processing of various digital signals, through which the additional services provided by the system are diversified and flexible, and the radio and television operators can easily control various equipment, which mainly include transmission stream processors, transmission stream multiplexers, conditional access systems, etc.

3. Transmission part. It is mainly used for channel coding modulation, and different modulation methods are used for different transmissions, such as QAM, QPSK and other modulation methods. 4. Management part.

It is the key to controlling the complexity of the digital front-end, and it must meet the basic requirements of network operation such as error management, setup management, performance management, security management, and user management.

<> this is the best scheme diagram, all equipment is included,

But there are many, incomplete statistics, mainly including:

1. Signal source:

SDH system, SDH adapter, optical receiver, demodulator, power divider, satellite machine, microwave equipment, NVOD system, VOD system, data broadcasting system, digital insertion system, analog insertion system, local program broadcast system, encoder, etc.

2. Signal processing:

Multiplexers, scramlers, QAM modulators, IPQAM modulators, ASI splitters, ASI switching systems, pad broadcast systems, mixers, RF preamplifiers, RF splitters, optical transmitters, optical amplifiers, optical distributors, etc.

3. Various system aspects:

CA scrambling system (server and software, encryption machine, etc.), EPG system (server and software, stream card, etc.), BOSS operation support system (server and software, customer PC, etc.), network switching system (layer 2 switch, layer 3 switch, router, firewall, fiber optic transceiver, etc.), satellite monitoring system (different equipment of different manufacturers), city network signal monitoring system (different equipment of different manufacturers), etc.

The front-end transformation of digital cable TV refers to the transformation of the front-end equipment of radio and television to digital TV, which generally includes the following aspects:

1: Transformation of front-end equipment of two-way network, including CMTS, EPON, EOC, etc. 2: Transformation of front-end equipment of digital TV services, including digital TV codec, modulator, multiplexer, etc. 3:

Front-end equipment transformation of interactive services, including VOD systems, digital broadcasting systems, etc.