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Digital television single frequency network radio frequency adapter and broadband network system thereof

A digital TV terrestrial and adapter technology, applied to TV system parts, digital video signal modification, TV, etc., can solve problems affecting the speed of DTTB market promotion, to ensure signal coverage quality, avoid transmission power loss, and improve coverage Effects and Stability Effects

Inactive Publication Date: 2010-06-16
桂林市思奇通信设备有限公司 +1
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  • Application Information

AI Technical Summary

Problems solved by technology

This has affected the market advancement speed of DTTB's large-scale promotion and application

Method used

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  • Digital television single frequency network radio frequency adapter and broadband network system thereof
  • Digital television single frequency network radio frequency adapter and broadband network system thereof
  • Digital television single frequency network radio frequency adapter and broadband network system thereof

Examples

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Embodiment Construction

[0026] Embodiment of radio frequency adapter for digital television single frequency network

[0027] The embodiment structure of this digital TV single frequency network radio frequency adapter is as follows figure 1 shown. Including up-down conversion filter module, reference clock, intermediate frequency gain control module, and programmable module, high-speed analog-to-digital, digital-to-analog conversion module. The programmable module in this example is a field programmable gate array FPGA.

[0028] The reference clock I of this example is a 10MHz constant temperature controlled crystal oscillator OCXO, which is connected with a phase-locked loop module to form a standard phase-locked loop circuit. The module sends the 854MHz local oscillator signal f2.

[0029] The input broadband RF spectrum signal F M The center frequency point F 0M It is 714MHz and the bandwidth is 40MHz. The FM signal contains 3 different channel signals F1, F2, and F3 with an effective bandw...

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PUM

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Abstract

The invention provides a digital television single frequency network radio frequency adapter and a broadband network system thereof. The adapter comprises a programmable module, and a broadband radio-frequency signal FM is subjected to down-conversion filtering to acquire a broadband intermediate frequency signal IF1. IF1 is switched in an intermediate frequency gain control module to acquire a broadband intermediate frequency signal IF2 with constant signal power. A / D conversion is performed to acquire a digital signal DATA1, which is switched in the programmable module to form DATA2=DATA1+delta t according to set time delay. The IF2 is subjected to D / A conversion to become a broadband intermediate frequency signal IF3 having accordant frequency domain with the IF2 and delayed time domain, and then the IF3 is subjected to up-conversion filtering to acquire a delayed broadband radio-frequency signal. The broadband network system is provided with the single frequency network radio frequency adapter. A multipath audio / video program source is processed by a front-end information source processing module, a channel processing module and a small signal broadband synthesizer into a small signal broadband radio-frequency signal FM. A signal chain transmits to each node, the single frequency network radio frequency adapter of each node adjusts the signal time delay and each broadband transmitter amplifies and transmits the signal FM, so the stability and covering effect of the system are improved and the cost is lowered.

Description

(1) Technical field [0001] The invention relates to the technical field of digital television terrestrial broadcasting, in particular to a digital television single frequency network radio frequency adapter and a digital television single frequency network broadband network system using the single frequency network radio frequency adapter. (2) Background technology [0002] In the digital television terrestrial broadcasting (Digital Television Terrestrial Broadcasting, DTTB) network system, in order to meet the needs of various services such as mobile and fixed reception, in the UHF frequency band of 300 ~ 3000MHz, multiple channels (or channels) are used to transmit simultaneously. Regional multi-channel (or channel) single frequency network (Single Frequency Network, SFN), this kind of system must involve the engineering optimization process of changing the transmission channel. The front end of DTTB's Multi-band Single Frequency Network system (M-SFNS) requires multi-chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/38H04N7/24H04N7/30H04N19/60
Inventor 顾伟峰曾志斌赵章佑李立彭铁雁
Owner 桂林市思奇通信设备有限公司
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