Multi-channel terrestrial digital television gap filler

Abstract

A multi-channel terrestrial digital television gap filler relates to the technical field of broadcast transmission. The multi-channel terrestrial digital television gap filler comprises a power amplifier pusher, a final-stage power amplifier, an isolator and a broadband filter which are successively connected, and is structurally characterized in that the multi-channel terrestrial digital television gap filler also comprises a multi-channel reception and frequency conversion module, and an input signal is input to an input terminal of the power amplifier pusher through the multi-channel reception and frequency conversion module; the multi-channel reception and frequency conversion module comprises a low noise amplifier, a mixer, a sound surface wave filter, an analog-digital converter, a field programmable gate array algorithm processor, a low pass filter, a quadrature modulation and frequency converter and a power amplifier which are successively connected; and a crystal oscillator is respectively connected to the mixer and the quadrature modulation and frequency converter through a voltage-controlled oscillator, and the field programmable gate array algorithm processor is connected to the voltage-controlled oscillator. The multi-channel reception and frequency conversion module is used as a frequency selection and promotion portion of the gap filler, the demand of covering multiple programs is satisfied, and the multi-channel terrestrial digital television gap filler is convenient to use and excellent in signal performance.

Description

technical field [0001] The invention relates to the technical field of broadcast transmission, in particular to a multi-channel terrestrial digital TV dot complementer. Background technique [0002] In terrestrial digital TV coverage, there are a lot of programs involved in the supplementary area, and a single channel or channel cannot meet the actual coverage needs. If all the equipment of a single channel or channel is used for coverage, then the number of equipment required There will be a lot, which will undoubtedly increase the cost of supplementary points. In order to change this situation, it is necessary to develop multi-channel or channel supplementary equipment, and integrate multiple channel equipment into one channel. [0003] In the prior art, a common practice is to place a filter at the input end of the supplementary device, and then output a mixed radio frequency signal through a combiner, then pass through a low-noise amplifier, and then pass through a fin...

AI Technical Summary

Problems solved by technology

Although the cost of the above method is relatively cheap, the performance index of the equipment is very poor.

In practical applications, it is greatly affected by the input signal, and the conditions of use are also very harsh.

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