CN203661177U

CN203661177U - Super-large scale 3GSDI digital matrix switching device with two-stage clock recovery function

Info

Publication number: CN203661177U
Application number: CN201320733319.6U
Authority: CN
Inventors: 周春雷; 马庆强
Original assignee: DALIAN KEDI VIDEO TECHNOLOGY Co Ltd
Current assignee: DALIAN KEDI VIDEO TECHNOLOGY Co Ltd
Priority date: 2013-11-19
Filing date: 2013-11-19
Publication date: 2014-06-18
Anticipated expiration: 2023-11-19

Abstract

The utility model discloses a super-large scale 3GSDI digital matrix switching device with the two-stage clock recovery function. The digital matrix switching device is composed of a signal input processing module, a switching module and a signal output processing module. The signal input processing module is used for carrying out equalization processing and primary clock recovery processing on a passing 3GSDI signal; the switching module is used for realizing switching of a 512-path input signal and a 512-path output signal of the 3GSDI signal as well as crossed switching of any path of input signal and any path of output signal; the signal output processing module is used for carrying out second-stage clock recovery processing and signal driving processing on the 3GSDI signal. According to the scheme, a problem of signal loss of the 3GSDI signal during the transmission switching process can be effectively solved; and security and stability of the broadcast-stage matrix device are improved. Meanwhile, on the basis of the structure of 24-U PCB board formation by connection two 12-U PCB boards, a problem of PCB board deformation caused by matrix dimension scale increasing can be effectively solved.

Description

There is the ultra-large 3GSDI character matrix switch of two-stage clock recovery function

Technical field

The utility model relates to video signal processing field, relates to specifically a kind of ultra-large 3GSDI character matrix switch with two-stage clock recovery function.

Background technology

Video matrix refers to that the method for switching by array exports arbitrarily m road vision signal to electronic installation on the monitor of n road.Common video matrix is according to the difference of input, output channel, generally there are the plurality of specifications such as 8 × 8,16 × 16,32 × 16,32 × 32,64 × 32,64 × 64,96 × 96,128 × 128,256 × 256,512 × 512, numeral before multiplication sign is the way of input signal, the way of multiplication sign digitized representation output signal below.

Video matrix is widely used in the equipment such as TV station, mobile TV, safety monitoring.Different sector applications has different requirements to performance, the specification etc. of matrix.The requirement of broadcast level video matrix is very high, is not only embodied in signal index, is also embodied in fail safe, the stability of equipment, and the maintainability that is easy to of system is also had to very high requirement.Along with the sharply increase of signals collecting terminal number amount, the following scale matrix in current 256 road can not meet the demand that market is used, and is badly in need of a kind of ultra-large matrix and fills up the blank in market.

Summary of the invention

In view of the defect that prior art exists, the purpose of this utility model is that a kind of 512 × 512 the ultra-large broadcast level 3GSDI character matrix switch with two-stage clock recovery function will be provided, to have met broadcasting and TV and the needs of security protection industry to matrix way.

To achieve these goals, the technical solution of the utility model is:

There is the ultra-large 3GSDI character matrix switch of two-stage clock recovery function, comprise signal input processing module, handover module and signal output processing module, it is characterized in that: described signal input processing module is for after equilibrium treatment and elementary clock recovery processing, delivering to 3GSDI signal after treatment the handover module being connected with described signal input processing module to carrying out through the 3GSDI signal of coaxial cable transmission; Described handover module is for realizing the switching of 3GSDI signal 512 input signal Yu512 road, road output signals and the wherein arbitrarily switching that intersects of road input signal and any road output signal; Described signal output processing module is for carrying out second level clock recovery processing and signal driver processing to the 3GSDI signal of described handover module output

Described signal input processing module comprises the elementary clock recovery chip for the 3GSDI signal transmitting through coaxial cable is carried out the equilibrium treatment chip of equilibrium treatment and carries out elementary clock recovery processing for the 3GSDI signal to after equilibrium treatment.

Described handover module comprises four groups of handover modules, and described handover module adopts M21170 chip as hand-off process chip.

Described signal output processing module comprises the signal driver chip for the 3GSDI signal of described handover module output is carried out the second level clock recovery chip of second level clock recovery processing and clock recovery 3GSDI signal after treatment in the second level is carried out to signal driver processing.

Described matrix switcher also comprises CPU element, and described CPU element is for monitoring the running status of matrix switcher and the switchover operation of real-time gating matrix switch.

Described matrix switcher also comprises that communication control module connects, and described CPU element is connected with communication control module, receives control command by communication control module.

The modules that described matrix switcher relates to and unit all arrange redundancy backup structure.

Described matrix switcher also comprises lays pcb board thereon by above-mentioned module and unit, and described pcb board is the pcb board that is connected and composed 24U by the pcb board of two 12U.

Between described pcb board, realize connection by flexible flat cable.

Compared with prior art, the beneficial effects of the utility model:

The utility model can effectively solve 3GSDI signal in transmission the signal loss problem in handoff procedure, guarantee to greatest extent the harmless transmission of 3GSDI signal in matrix device and greatly improved fail safe and the stability of broadcast level matrix device; Adopt the pcb board of two 12U to connect and compose the structure problem that effectively solution causes pcb board to be out of shape and then to affect product quality because matrix size scale increases of the pcb board of 24U simultaneously.

Accompanying drawing explanation

Fig. 1 is the utility model 3GSDI character matrix switch structural representation;

Fig. 2 is that motherboard of the present utility model is by FFC cable connection description schematic diagram;

Fig. 3 is the signal input module circuit diagram on the 1st tunnel;

Fig. 4 is the signal interface circuit figure of the 1st road handover module;

Fig. 5 is the control interface figure of the 1st road handover module;

Fig. 6 is the 1st road signal output processing circuit figure;

Fig. 7 is CPU element module detailed circuit diagram;

Fig. 8 is the command process detailed circuit diagram of communication module;

Fig. 9 is that communication module order receives detailed circuit diagram;

Figure 10 is the redundancy treatment mechanism process schematic diagram of normally working;

Figure 11 is the redundancy treatment mechanism process schematic diagram of working while breaking down;

Figure 12 is the redundancy treatment mechanism process schematic diagram of working while breaking down;

Figure 13 is the redundancy treatment mechanism process schematic diagram of working while breaking down;

Figure 14 is the redundancy treatment mechanism process schematic diagram of working while breaking down.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is further elaborated.

The utility model proposes a kind of 512 × 512 the ultra-large broadcast level 3GSDI character matrix switch with two-stage clock recovery function, greatly met broadcasting and TV and the needs of security protection industry to matrix way.But 512 tunnel input Yu512 road outputs can cause the increase of matrix size scale, thereby produce series of problems.One of design bottleneck that matrix size scale increases is in the fixing situation of cabinet width criteria, in cabinet, can not infinitely expand as the pcb board size of backboard, according to pcb board manufacture craft, the optimum size of pcb board is 12U left and right (1U=44mm) at present, but 512 × 512 ultra-large 3GSDI matrixes need adopt the pcb board of 24U, may cause like this problems affect product qualities such as pcb board distortion.In order to address this problem, the utility model adopts the pcb board of two 12U to connect and compose the pcb board of 24U.And connection between pcb board is a key technology, classical matrix is used specialized high-speed cable transmission high speed signal, and specialized high-speed cable and connector thereof are substantially all from external import, the defect that it has, and price is high, procurement cycle is long.This patent adopts FFC (flexible flat cable) to replace specialized high-speed cable to propagate 3GSDI high-speed digital signal, cost is low, procurement cycle is short, and signal transmission characteristics tests the requirement of full up sufficient signal transmission quality through actual product, it connects as shown in Figure 2, concrete described matrix switcher adopts FFC (flexible flat cable) to connect by 2 12U, 256 tunnel inputs, 256 tunnel output pcb boards, and maximum can realize the 512 tunnel input Yu512 road outputs of 3GSDI signal.

The technical requirement of broadcast level product is very high, and the transmission of 3GSDI signal is extremely harsh to the requirement of environment.By to the research of 3GSDI signal transmission characteristics, in product, adopt doubleclocking recovery technology, realize ultra-large and combination high speed performance.Elementary clock recovery be solve 3GSDI signal through matrix prime equipment to matrix signal index after coaxial cable transmits serious problem that declines; Second level clock recovery is to solve the signal loss problem that vision signal exists after the hand-off process of internal matrix.Doubleclocking recovery technology has farthest realized the harmless transmission of 3GSDI signal in matrix device.

As shown in Figure 1, concrete described matrix switcher comprises signal input processing module, handover module, signal output processing module, CPU element and communication control module:

One, signal input processing module

Signal input processing module Gong512 road input signal processing circuit, here " the 1st road signal input processing circuit figure " that only choose as shown in Figure 3 demonstrates explanation: 3GSDI signal, after coaxial cable transmission entering signal input processing module, is converted to the differential signal of 100 ohms impedance match by the unipolar signal of 75 ohms impedance match.3GSDI signal is process equilibrium treatment and elementary clock recovery processing in input processing module, thereby system completes the processing to input signal.The self adaptation cable equalizer LMH0344 that equilibrium treatment chip selects TI semiconductor company to produce, the LMH0366 that clock recovery chip uses TI company to produce.

Two, handover module

Handover module is made up of four groups of handover modules, and four groups of handover modules can be realized at most the intersection of exporting and can do any road signal in 3GSDI signal 512 input Yu512 roads, tunnel and switch; Here " the 1st the handover module circuit diagram " only chosen as shown in Figure 4, Figure 5 describes, and the 1st road input signal and the 1st tunnel output signal are by the transmission of M21170 chip signal interface; The intersection switching of its signal is sent by CPU element, is received by M21170 chip controls interface.In handover module, it switches the M21170 that chip uses Mindspeed company to produce.

Three, signal output processing module

Signal output processing module Gong512 road output signal processing circuit, here " the 1st road signal output processing circuit figure " that only choose as shown in Figure 6 demonstrates explanation: in order to improve signal quality, reduce the loss of signal that signal exists after the hand-off process of video matrix inside, signal through handover module output does clock recovery processing and the signal driver of the second level in signal output processing module, 3GSDI signal converts by differential signal the unipolar signal that meets transmission standard in signal output processing module, thereby is transferred to rear class equipment by coaxial cable.The driving chip LMH0302 that signal driver chip selects TI semiconductor company to produce, the LMH0366 that clock recovery chip uses TI company to produce.

Four, CPU element and communication control module

Each handover module supports the use a CPU element, and " the CPU element circuit diagram of the 1st handover module " only chosen here as shown in Figure 7 demonstrates explanation: described CPU element is for monitoring the running status of matrix switcher and the switchover operation of real-time gating matrix switch.

Described matrix switcher also comprises that communication control module connects, and described CPU element is connected with communication control module, receives control command by communication control module, and its treatment circuit figure as shown in Figure 8, Figure 9.

The requirement of broadcast level matrix is not only embodied in the one side that signal index is high, is also embodied in fail safe, the stability of equipment, the maintainability that is easy to of system is also had to very high requirement simultaneously.This patent adopts system-level redundancy backup design, as shown in Figure 10, Figure 11, Figure 12, Figure 13, Figure 14, at input module, power module (because any matrix all comprises power module, therefore in this patent, do not embody this module), control module, handover module and output module all adopt Redundancy Design no matter which rank of processing module of matrix device break down, its corresponding redundant module can be enabled at short notice, realize the continuation work of system, greatly improved fail safe and the stability of broadcast level matrix device.

The above; it is only preferably embodiment of the utility model; but protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose technical scope in; be equal to replacement or changed according to the technical solution of the utility model and utility model design thereof, within all should being encompassed in protection range of the present utility model.

Claims

1. there is the ultra-large 3GSDI character matrix switch of two-stage clock recovery function, comprise signal input processing module, handover module and signal output processing module, it is characterized in that: described signal input processing module is for after equilibrium treatment and elementary clock recovery processing, delivering to 3GSDI signal after treatment the handover module being connected with described signal input processing module to carrying out through the 3GSDI signal of coaxial cable transmission; Described handover module is for realizing the switching of 3GSDI signal 512 input signal Yu512 road, road output signals and the wherein arbitrarily switching that intersects of road input signal and any road output signal; Described signal output processing module is for carrying out second level clock recovery processing and signal driver processing to the 3GSDI signal of described handover module output.

2. character matrix switch according to claim 1, is characterized in that: described signal input processing module comprises the elementary clock recovery chip for the 3GSDI signal transmitting through coaxial cable is carried out the equilibrium treatment chip of equilibrium treatment and carries out elementary clock recovery processing for the 3GSDI signal to after equilibrium treatment.

3. character matrix switch according to claim 1, is characterized in that: described handover module comprises four groups of handover modules, and described handover module adopts GX3290, GX3246 or M211XX as hand-off process chip.

4. character matrix switch according to claim 1, is characterized in that: described signal output processing module comprises the signal driver chip for the 3GSDI signal of described handover module output is carried out the second level clock recovery chip of second level clock recovery processing and clock recovery 3GSDI signal after treatment in the second level is carried out to signal driver processing.

5. character matrix switch according to claim 1, is characterized in that: described matrix switcher also comprises CPU element, and described CPU element is for monitoring the running status of matrix switcher and the switchover operation of real-time gating matrix switch.

6. character matrix switch according to claim 5, is characterized in that: described matrix switcher also comprises that communication control module connects, and described CPU element is connected with communication control module, receives control command by communication control module.

7. character matrix switch according to claim 6, is characterized in that: the modules that described matrix switcher relates to and unit all arrange redundancy backup structure.

8. character matrix switch according to claim 6, is characterized in that: described matrix switcher also comprises lays pcb board thereon by above-mentioned module and unit, and described pcb board is the pcb board that is connected and composed 24U by the pcb board of two 12U.

9. character matrix switch according to claim 8, is characterized in that: between described pcb board, realize connection by flexible flat cable.