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Front-end device based on DVB digital television RF channel measurement

A radio frequency channel, digital TV technology, applied in the direction of TV, electrical components, image communication, etc., can solve the problems of increasing circuit complexity, time-consuming chip area, restricting processing speed, etc., to improve processing speed, simplify design, and reduce components. cost effect

Inactive Publication Date: 2005-11-02
上海国皓电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] First, only fixed ratio interpolation can be performed, which will bring great difficulties to the realization of the analog reconstruction filter after digital-to-analog conversion for digital satellite TV with a symbol rate of 2-45MPS
[0006] Second, the digital filter composed of a multiplication-add structure greatly restricts the processing speed due to its time-consuming and chip-area-consuming bottle diameter, and must use expensive high-end devices, which will inevitably affect the digital filter. For pipeline processing or multi-stage implementation, the complexity of the circuit will increase significantly

Method used

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Embodiment Construction

[0037] Referring to FIG. 2 , as a preferred embodiment of the present invention, it aims to provide a solution that can achieve high performance, low cost and easy implementation in digital TV channel coding front-end equipment.

[0038] As a preferred embodiment of the present invention, it consists of a forward error correction FEC unit (1) with an asynchronous serial interface ASI or / and SPI (LVDS) input interface, an interpolation filter unit (2), an It consists of a digital modulator unit (3) and a numerically controlled oscillator NCO (4).

[0039] Wherein, the forward error correction FEC unit (1) has a built-in asynchronous serial interface ASI or / and SPI (LVDS) input interface, for the serial symbol code stream MPEG-II TS stream through data compression encoding from this interface, first The purpose of randomization processing is to maintain the balance of channel radio frequency carrier power in the future modulation process; and then channel code the randomized cod...

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PUM

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Abstract

The present invention provides a front end device based on DVB digital TV RF channel measurement, which comprises one or more FEC units, one or more interpolation filter units, one or more digital QAM units and one or more digital control oscillators. The invention uses interpolation filter composed by multiphase digital filter, null filter, and cascade integration comb filter, integrates digital filter without complex multiple and adding framework, simplifies greatly interpolation scheme for digital communication, and decreases realization cost.

Description

technical field [0001] The invention relates to a front-end device based on DVB digital TV radio frequency channel measurement, in particular to a test device for generating DVB digital TV signals and playing back. Background technique [0002] In DVB digital TV channel coding technology, in order to meet the Nyquist requirements, limit the bandwidth of the transmission spectrum, and reduce the intersymbol interference, it is necessary to perform low-pass rolling on the symbol stream of the baseband signal to be modulated At the same time, since the baseband signal must be quadrature modulated by the carrier, this requires that the baseband and the carrier should have the same data rate, in order to achieve this purpose, the baseband signal must be interpolated before the baseband signal is quadrature modulated , to increase the rate of the baseband symbol rate. [0003] As a well-known technology, it adopts the FIR structure of multiply-add filter to realize the solution o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N17/00
Inventor 申鸣
Owner 上海国皓电子有限公司
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