Blind scanning system and method for DVB-S system

A DVB-S, blind scan technology, applied in the field of satellite digital TV transmission, can solve problems such as limited analog tuner stepping resolution, avoid negative threshold effects, improve accurate detection, and reduce resolution dependence.

Inactive Publication Date: 2010-07-14
SUNPLUS TECH CO LTD
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  • Application Information

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Problems solved by technology

At the same time, it can solve the problem that the existing technology is often limited by the step resolution of the analog tuner

Method used

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  • Blind scanning system and method for DVB-S system
  • Blind scanning system and method for DVB-S system
  • Blind scanning system and method for DVB-S system

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Embodiment Construction

[0047] In order to make the objectives, technical solutions, and advantages of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0048] figure 2 This is a schematic diagram of the structure of the blind scan system used in the DVB-S system of the present invention. figure 2 , The structure of the blind scanning system used in the DVB-S system of the present invention will be described as follows:

[0049] The blind scan system used in the DVB-S system of the present invention includes: an analog tuner (tuner) 205, an analog to digital converter (Analog to digital converter, ADC) 210, and an analog tuner automatic gain control device (AGC) 215 , A digital mixer (Digital Mixer) 220, an interpolation device (Interpolation Device) 225, a digital automatic gain control device (DAGC) 230, a digital matched filter (Digital Matched Filter, DMF) 235, a spectrum calculation Device 240...

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Abstract

The invention provides a blind scanning system for a DVB-S system. A control device of the system sets the analogue carrier frequency deviation of an analogue tuner according to a searching frequency range and judges whether signals are detected or not in a frequency spectrum output by a digital matched filter, if the signals are not detected, the control device sets the analogue tuner to enable the main components of a signal frequency spectrum to be detected to shift to the working bandwidth of the digital matched filter; the parameters of the signal to be detected are obtained, the digital carrier frequency deviation of the frequency spectrum is calculated according to the rough carrier frequency deviation of the frequency spectrum, and a digital mixer is set so as to carry out frequency shift on the digital baseband signal; and the digital mixer shifts the center of a detected signal frequency spectrum to the direct current part of the working frequency spectrum of the digital matched filter according to the setting of the control device. The invention also provides a blind scanning method for the DVB-S system. By adopting the method and the device, the carrier frequency deviation and the symbol rate can be accurately calculated, and quick blind scanning can be realized.

Description

Technical field [0001] The present invention relates to the technical field of satellite digital television transmission, in particular to a blind scan system and method used in a DVB-S system. Background technique [0002] For digital TV to flourish, the first task is to establish a digital platform. Digital platform refers to not only pure hardware devices such as set-top boxes (Set-TopBox), but also digital channels and digital content. [0003] At present, the main specifications of global digital TV can be divided into several areas, including the ATSC (Advanced Television Systems Committee) system based on the US market, the DVB (Digital Video Broadcasting) system based on the European market, and the Chinese mainland market. DTMB (Digital Terrestrial Multimedia Broadcasting) system, as well as ISDB-T system based on the Japanese market. Among them, the DVB system can be further subdivided into DVB-C (Cable), DVB-S (Satellite), and DVB-T (Terrestrial). The so-called DVB-C ...

Claims

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Application Information

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IPC IPC(8): H04N7/20H04N5/50
Inventor 曾俊杰黄柏方
Owner SUNPLUS TECH CO LTD
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