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Modem of cable television system

A modem and cable TV technology, which is applied to TV system parts, color TV parts, TVs, etc., can solve the problems of arbitrary changes and inability to realize the working frequency, so as to increase flexibility and convenience, and improve overall efficiency Effect

Inactive Publication Date: 2013-12-04
张镇非
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the uplink and downlink transceiver modules used for data transmission generally use quartz crystals to oscillate to generate the required base frequency. Therefore, the target operating frequency must be changed by replacing the quartz crystal and adjusting the component values ​​of the band-pass and filter circuits. As a result, it is practically impossible to change the working frequency at will

Method used

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  • Modem of cable television system
  • Modem of cable television system
  • Modem of cable television system

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Embodiment Construction

[0048] The implementation of the present invention will be described in more detail in conjunction with the drawings and component symbols below, so that those skilled in the art can implement it after studying this specification.

[0049] refer to figure 1 , is a schematic diagram of the modem of the cable television system of the present invention. Such as figure 1 As shown, the modem of the cable television system of the present invention includes a power conversion unit 10, an output control and fraud detection unit 20, an uplink control unit 30, an uplink transmission unit 40, a data connection unit 50, a mixer SD, and a downlink receiving unit 60 , a downlink control unit 70 and a phase-locked loop (Phase-Locked Loop, PLL) unit 80, which are used to provide the two-way transmission function between the residential TV terminal of the cable TV system and the computer PC.

[0050] The power conversion unit 10 mainly converts the external input power Vin into an output pow...

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Abstract

The invention discloses a modem of a cable television system. The modem comprises a power conversion unit, an output control and connection stealing detection unit, an uplink control unit, an uplink transmitting unit, a mixer, a downlink receiving unit, a downlink control unit and a data connection unit. The power conversion unit converts an input power supply into a power supply required by other units. The output control and connection stealing detection unit is connected with a household television use terminal, can produce an uplink message which at least contains a connection stealing state, and transmits the uplink message to a computer through the uplink control unit, the uplink transmitting unit, the mixer and the data connection unit in an ASK mode. The data connection unit can transmit a downlink message of the computer to the output control and connection stealing detection unit through the mixer, the downlink receiving unit and the downlink control unit in a FSK mode. The playing of a cable television signal of the household television use terminal can be controlled.

Description

technical field [0001] The present invention relates to a modem for a cable TV system, in particular to using Amplitude Shift Keying (ASK) and Frequency Shift Keying (FSK) for uplink and downlink data respectively. Background technique [0002] Cable TV is a very common entertainment channel at present, especially the number of channels that can be accommodated by cable TV is much more than that of wireless TV, and the signal is relatively stable. Therefore, ordinary consumers have gradually abandoned their own receiving antennas to receive TV programs on wireless TV. model. In addition, the cable TV system also provides the two-way transmission function of receiving and transmitting. Therefore, the cable TV industry can use the backhaul mechanism to check the signal quality of the client, and can further monitor and prevent the cable TV cable from being spliced ​​or stolen. [0003] In the prior art, the transmission of the uplink and downlink messages used by the CATV mod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/40H04N5/455H04N7/10
Inventor 张镇非
Owner 张镇非
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