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Ground digital television repeater

A terrestrial digital TV and repeater technology, applied in the direction of single carrier transmission of single TV signal, advanced technology, climate sustainability, etc. Linear Metrics, Effects of Damage Control

Inactive Publication Date: 2007-08-29
深圳市银波达通信技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the linearity of the existing same-frequency repeater and frequency-shifting repeater is not high, and the damage to the power amplifier module cannot be effectively controlled by the same-frequency self-excitation.

Method used

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  • Ground digital television repeater
  • Ground digital television repeater
  • Ground digital television repeater

Examples

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Embodiment Construction

[0024] Please refer to FIG. 3 to FIG. 9 , the ground vertical TV repeater of the present invention includes a low noise amplifier (abbreviated as LNA) module, a frequency conversion module and a power amplifier (abbreviated as PA) module.

[0025] The low-noise amplification module is used to receive digital TV signals and pre-amplify the signals, which includes a preamplifier unit 11, an adjustable attenuator unit 12, a second-stage amplifying unit 13, an automatic gain control unit 15, and a delay unit 14 and a power supply unit 16 that supplies power to the entire module. Digital TV signal input preamplifier unit 11, the output terminal of this preamplifier unit 11 is connected to an input end of adjustable attenuator unit 12, and the output terminal of this adjustable attenuator unit 12 is connected to the input of second stage amplifying unit 13 terminal, the signal input terminal of the automatic gain control unit 15 is connected to the output terminal of the second stag...

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PUM

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Abstract

The direct play over station includes amplification module (AM) with low noise, frequency conversion module, and power AM connected in sequence. AM with low noise includes preamplifier unit, adjustable attenuator unit (AAU) and second stage of power amplification unit (SSPAU). AM with low noise also includes automatic gain control (AGC) unit and delay unit. Signal input end of AGC unit is connected to the output end of SSPAU. The control end of AGC unit is connected to the input end of the delay unit. The output end of the delay unit is connected to another input end of AAU. Proper designed AGC unit can adjust the output voltage in good time based on intensity of the output signal of SSPAU in AM with low noise so as to control intensity of the output signal of SSPAU. The invention guarantees linear index of back stage under conditions of each input power, and controls harm for back stage power amplification unit caused by common frequency self-excitation effectively.

Description

technical field [0001] The invention relates to the field of digital television, in particular to a terrestrial digital television repeater. Background technique [0002] Terrestrial digital TV repeater is a network optimization product designed for terrestrial digital TV system. The terrestrial digital TV repeater enhances the received signal, amplifies it at the same frequency or through frequency conversion, and then transmits it. After forwarding, the coverage range reaches 0.5-5 kilometers. It is suitable for: a) Suburbs, villages, and traffic along the Coverage; b) coverage of shadowed areas (such as mountainous areas); c) coverage of large building interiors, underground shopping mall parking lots, subway systems and other environments. [0003] Digital TV repeater is a kind of wireless relay amplification equipment, which plays a role of signal enhancement in the process of digital TV transmission. Digital TV repeater is an economical and effective means to expand ...

Claims

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Application Information

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IPC IPC(8): H04N7/045H04B7/005
CPCY02D30/70
Inventor 向涛
Owner 深圳市银波达通信技术有限公司