Controllable automatic gain controlling circuit for cable television network

A technology of automatic gain control and cable television network, which is applied in the direction of cable transmission adaptation, etc., and can solve problems such as poor stability, long stabilization time, and AGC circuits that do not have manageable functions.

Inactive Publication Date: 2006-01-11
SHANGHAI UNIV +1
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up the above, the existing AGC circuit does not have a manageable function, the output level of the circuit cannot be set through the network, the required stabilization time is long, and the stability is poor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Controllable automatic gain controlling circuit for cable television network
  • Controllable automatic gain controlling circuit for cable television network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] figure 1 A schematic block diagram of the circuit of the present invention is shown.

[0023] A preferred embodiment of the present invention is: see figure 2 , the circuit connection structure is as follows: the radio frequency input signal first passes through the voltage-controlled attenuator 1, and after being amplified by a radio frequency amplification module 2, the main signal is output through a splitter 3, and the radio frequency output branch signal is generated at the same time. Then the radio frequency branch signal is connected to a radio frequency detection module 4, and its output is connected to the single-chip processor 6, and finally the control signal output after the single-chip processor 6 performs PID algorithm processing on the input signal is connected to the voltage control attenuator 1 to form Automatic gain control loop. The serial data interface of the single-chip processor 6 is connected with the interface conversion module 8, and the inp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

This invention relates to a controllable automatic gain control circuit used in wire TV network. A RF input signal outputs a master signal and generates a RF output branch signal via a voltage control attenuator, a RF amplifying module and a branch device, then the RF branch signal is connected with a RF test module, its output is connected to a single-chip processor with an A / D and D / A conversion function module, the control signal output after PID algorithm process to the input signal via the single-chip processor is connected to the voltage control attenuator to form an automatic gain control loop.

Description

technical field [0001] The invention relates to an automatic gain control circuit for a cable television network, in particular to a controllable automatic gain control circuit for a cable television network. Background technique [0002] In most transmission equipment, the stability of the signal transmitted from the front end of the front-end hybrid transmission system (HFC) is poor. In addition, factors such as aging attenuation and temperature fluctuation of the cable network and optical fiber network cause large signal fluctuations in the network, which often exceed the adjustment of the AGC circuit. Range, resulting in imbalance phenomenon, can not play the role of automatic gain control. On the other hand, sudden noise often occurs in the channel of backhaul reception, which requires network managers or equipment to adjust the channel gain in time to eliminate the adverse effects of noise. [0003] In the prior art, there is a radio frequency automatic gain control (...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/10
Inventor 董戎萍张瑞峰沈昶宏李迎春陈健宋英雄
Owner SHANGHAI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap