Digital television terrestrial broadcasting system and construction method thereof

A digital TV terrestrial and broadcasting system technology, applied in broadcasting transmission systems, broadcasting-related systems, broadcasting devices, etc., can solve the problems of high transmission power, difficult improvement, and inability to be covered, and achieve low selection requirements, small electromagnetic pollution, The effect of small pollution area

Pending Publication Date: 2018-05-18
北京牡丹电子集团有限责任公司数字科技中心
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Problems solved by technology

Moreover, building occlusion produces many signal blind spots
In addition, due to the high transmission power, there are certain requirements on the transmission point. There may be many

Method used

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  • Digital television terrestrial broadcasting system and construction method thereof
  • Digital television terrestrial broadcasting system and construction method thereof
  • Digital television terrestrial broadcasting system and construction method thereof

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Embodiment Construction

[0034] In view of the problems existing in the prior art, the inventor proposes an idea of ​​using low-power transmission to form a network. The invention is a technique for transmitting supplementary signals and networking with low power in a DTMB network. Design filter circuits to process electromagnetic waves in the air, control small insertion loss, filter out useful signals, and then design low-power transmitting equipment to realize low-power multi-point transmission within the guard interval that reflected signals can be received.

[0035] DTMB (Digital Television Terrestrial Multimedia Broadcasting) is the English abbreviation of Digital Television Terrestrial Multimedia Broadcasting. In the DTMB system, the time-domain synchronous Orthogonal Frequency Division Multiplexing (OFDM) modulation method is adopted to support data transmission within the 8MHZ bandwidth. OFDM adds a guard interval between each symbol in the subcarrier to reduce intersymbol interference and c...

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Abstract

The invention discloses a digital television terrestrial broadcasting system and a construction method thereof. The system comprises at least one transmitter; the transmitter comprises a first filtercircuit, a first front-stage amplification unit and a power amplification unit, which are connected in sequence, wherein the transmitter is used for receiving a digital television terrestrial broadcasting network signal from the air, processing the digital television terrestrial broadcasting network signal, and then, transmitting the digital television terrestrial broadcasting network signal; thefirst filter circuit is obtained based on the frequency of the received signal; and furthermore, the power and the number of the transmitter are determined according to the area and the terrain needing to be covered and the signal value of the received signal. According to the digital television terrestrial broadcasting system and the construction method thereof disclosed by the invention, the low-power transmitter is adopted; selection requirements on a transmitting point can be reduced; therefore, the transmitting point can be flexibly arranged; in addition, the filtered and amplified signalis transmitted in a guard interval in a supplementary manner; and thus, a main coverage signal blind area can be repaired.

Description

technical field [0001] The invention relates to the technical field of digital TV terrestrial broadcasting, in particular to a digital TV terrestrial broadcasting system and a building method thereof. Background technique [0002] Among the digital TV terrestrial, cable and satellite transmission methods, the digital TV terrestrial transmission system has the most complicated environment, and has attracted much attention because of its highest technical requirements and wide audience. The standards of the terrestrial system already have American Advanced Television System Committee (ATSC), European Digital Video Terrestrial Broadcasting (DVB-T) and Japanese Terrestrial Integrated Service Digital Broadcasting (ISDB-T). In 1999, my country set up a major special project for digital TV R&D and industrialization and established a national digital TV leading group to clearly formulate technical standards independently. Aiming at the specific standards for China's digital TV appl...

Claims

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Application Information

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IPC IPC(8): H04H20/72H04H60/81H04H60/86H04H60/90
CPCH04H20/72H04H60/81H04H60/86H04H60/90Y02D30/70
Inventor 白旭高宝祥侯英莲
Owner 北京牡丹电子集团有限责任公司数字科技中心
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