CN2519542Y

CN2519542Y - Responder

Info

Publication number: CN2519542Y
Application number: CN 01249442
Authority: CN
Inventors: 陈为理; 杨子文; 李代红; 杨学军
Original assignee: 陈为理
Priority date: 2001-08-06
Filing date: 2001-08-06
Publication date: 2002-10-30
Anticipated expiration: 2011-08-06

Abstract

The utility model relates to a transponder used for a cable television network bidirectional communication device, consisting of a single chip microcomputer 4, a reversing digital signal decoder device 1, a forward digital signal modulating device 3, a program controlled radio frequency switch 2 and a frequency-changeable phase-locked loop 5. As the utility model is provided with the frequency-changeable phase-locked loop, when a plurality of such transponders are used in the real-time management system of the cable television network, one transponder can communicate in one frequency with the other transponders waiting in the other frequencies, while, when this transponder finishes communicating and is converted to another frequency to wait, another transponder is converted to this frequency to communicate. In such a circle, the noise caused by other transponders can be calculated in one frequency, which can be filtered easily on the front end and will not interfere with the normal communication with the effect of reliable communication and powerful anti-interference ability.

Description

Transponder

Technical field

The utility model relates to a kind of watch-dog in the cable TV network real-time management system, the particularly transponder in the bi-directional communication device.

Background technology

In a cable TV network real-time management system, transponder is very universal at down channel as a kind of bi-directional communication device, because front end computer sends the address with broadcast mode to transponder, and the signal to noise ratio of cable TV downlink system is higher.So the communication of down channel is reliable; And be a kind of shared channel of convergent type at up channel, during communication of the communications of a plurality of transponders to a front end computer; When a transponder communicated, other transponders were equivalent to the audio-frequency noise source, and these noise sources are pooled to the communication that will disturb the normal response device behind the front end.

Summary of the invention

The purpose of this utility model is for providing a kind of reliable communications, transponder that antijamming capability is strong.

To achieve these goals, the utility model is such: a kind of transponder, comprise cable tv broadcast or telephone line transmitted downstream data channel and uplink data channels on single-chip microcomputer, the single-chip microcomputer, reverse digital signal decoder device is arranged on downstream data channel, forward digital signal modulating device is arranged on uplink data channels; This device front end also is connected to a program control radio-frequency (RF) switch, but be connected to the phase-locked loop of frequency saltus step on the forward digital signal modulating device, described forward digital signal modulating device, reverse digital signal decoder device, program control radio-frequency (RF) switch and phase-locked loop also are provided with a plurality of dac signal input interfaces by Single-chip Controlling on the single-chip microcomputer; Described digital-to-analogue conversion input signal interface includes temperature interface, alternating voltage interface, direct voltage interface, radio frequency level interface.

Because but the utility model is connected to the phase-locked loop of frequency saltus step on the forward digital signal modulating device of transponder, when such transponder is a plurality of when being applied in the cable TV network real-time management system, when a transponder communicated on a frequency, other transponders were waited on another frequency; After this transponder communication is intact, forward on another frequency and wait for, and another transponder goes to and communicates on this frequency; Circulation according to this, the noise storage that produces of other transponders is easy to by filtering at front end, and can disturb proper communication on a frequency like this, has reached reliable communications, effect that antijamming capability is strong.

Description of drawings

Fig. 1 is the frame principle figure of transponder;

Fig. 2 is the electrical schematic diagram of transponder;

Fig. 3 is the continuous page or leaf figure of Fig. 2 electrical schematic diagram;

In above-mentioned accompanying drawing; 1 reverse digital signal decoder device; 2 program control radio-frequency (RF) switch; 3 forward digital signal modulating devices; 4 single-chip microcomputers; But the phase-locked loop of 5 frequency saltus steps; 6 radio frequency level interfaces; 7 have the temperature interface; 8 direct voltage interfaces; 9 alternating voltage interfaces; 10 downstream data channel; 11 uplink data channels; 12 downlink data tape base signals; 13 upstream data tape base signals;

Embodiment

Enumerate preferred embodiment below in conjunction with accompanying drawing the utility model is done more detailed description.

The transponder of present embodiment, comprise single-chip microcomputer 4, downstream data channel that cable tv broadcast or telephone line transmitted 10 on the single-chip microcomputer and uplink data channels 11, reverse digital signal decoder device 1 is arranged on downstream data channel, forward digital signal modulating device 3 is arranged on uplink data channels, this device front end also is connected to a program control radio-frequency (RF) switch 2, but be connected to the phase-locked loop 5 of frequency saltus step on the forward digital signal modulating device, described forward digital signal modulating device 3, reverse digital signal decoder device 1, program control radio-frequency (RF) switch 2 and phase-locked loop 5 also are provided with a plurality of digital-to-analogue conversion input interfaces by single-chip microcomputer 4 controls on the single-chip microcomputer.This dac signal input interface includes temperature interface 7, alternating voltage interface 9, direct voltage interface 8, radio frequency level interface 6.

The transponder of present embodiment is like this work: from the two-way cable TV network network interface of the Equipment Control computer of general headend the order data that sends is modulated into fsk signal input cable TV network, transport to from subscriber's amplifier on the reverse digital signal decoder device 1 of transponders all on this network through downstream data channel 10, these devices are demodulated to downlink data tape base signal 12 with fsk signal and transport to single-chip microcomputer 4, the data that single-chip microcomputer 4 is collected on a plurality of digital-to-analogue conversion input interfaces judge whether to communicate through computing, and one of them transponder that meets communication condition divides three tunnel control outputs by its single-chip microcomputer 4 controls: the one tunnel controls program control radio-frequency (RF) switch 2; Another road output upstream data tape base signal 13; But also have the phase-locked loop 5 of one road control frequency saltus step, send a specific frequency; Upstream data tape base signal 13 also enters forward digital signal modulating device 3, the frequency that is determined with phase-locked loop 5 is modulated the program control radio-frequency (RF) switch 2 of up fsk signal feed-in of generation, and the order that program control radio-frequency (RF) switch 2 is sent according to the Equipment Control computer of general headend is by the break-make of single-chip microcomputer 4 control fsk signals; At last, the up fsk signal Equipment Control computer that feeds back to general headend along cable TV network is finished and the communicating by letter of transponder.

Claims

1 one kinds of transponders, comprise single-chip microcomputer (4), cable tv broadcast or telephone line transmitted downstream data channel (10) and uplink data channels (11) on the single-chip microcomputer, reverse digital signal decoder device (1) is arranged on downstream data channel, forward digital signal modulating device (3) is arranged on uplink data channels, it is characterized in that: on uplink data channels, be connected to a program control radio-frequency (RF) switch (2), but be connected to the phase-locked loop (5) of frequency saltus step on the forward digital signal modulating device, described forward digital signal modulating device (3), reverse digital signal decoder device (1), program control radio-frequency (RF) switch (2) and phase-locked loop (5) also are provided with a plurality of digital-to-analogue conversion input interfaces by single-chip microcomputer (4) control on the single-chip microcomputer.

2 transponders according to claim 1 is characterized in that: described dac signal input interface includes temperature interface (7), alternating voltage interface (9), direct voltage interface (8), radio frequency level interface (6).