CN202617284U

CN202617284U - VGA encoder for long-distance transmission

Info

Publication number: CN202617284U
Application number: CN 201220181878
Authority: CN
Inventors: 廖海; 陈功
Original assignee: SHENZHEN REACH INFORMATION TECHNOLOGY Co Ltd
Current assignee: SHENZHEN REACH INFORMATION TECHNOLOGY Co Ltd
Priority date: 2012-04-24
Filing date: 2012-04-24
Publication date: 2012-12-19
Anticipated expiration: 2022-04-24

Abstract

The utility model provides a VGA encoder for long-distance transmission, which comprises a VGA signal A/D converter, and the VGA encoder further comprises a microprocessor and a programmable logic gate array circuit which are mutually connected, wherein the VGA signal A/D converter is connected to a signal input end of the programmable logic gate array circuit, a signal output end of the microprocessor is connected with an Ethernet transceiver, and a signal output end of the programmable logic gate array circuit is connected with the VGA signal D/A converter; further, the microprocessor is connected with a memory, a program memory and a parameter register, and the programmable logic gate array circuit is connected with a synchronous dynamic random access memory connection. Due to the adoption of the microprocessor DSP and the programmable logic gate array FPGA circuit, and the signal output end of the microprocessor DSP is connected with the Ethernet transceiver, the long-distance transmission of VGA signals can be realized, and the VGA encoder has wide application.

Description

The VGA encoder of long-distance transmissions

Technical field

The utility model relates to a kind of VGA encoder, the especially a kind of VGA encoder that can realize VGA signal long-distance transmissions.

Background technology

VGA (Video Graphics Array) is a Video Graphics Array, is that IBM released with the PS/2 machine in 1987.The keyboard and mouse interface that uses on the PS/2 computer is exactly present PS/2 interface, has the resolution height, shows advantages such as speed is fast, color is abundant, has obtained using widely in the color monitor field.VGA be maximum manufacturers a common standard of supporting, PC before loading own unique driver, standard that all must support VGA.For example, the start-up picture of the Windows of Microsoft series of products still uses the VGA display mode, and this also explains its importance and compatibility in display standard.

The VGA encoder is an encoder of supporting the VGA vision signal, belongs to a kind of of HD video encoder, and most of product is on the market generally only supported one road VGA video acquisition coding, has one road stereo capturing and coding simultaneously.Because the performance characteristics of AD acquisition chip, so the VGA encoding board is generally all supported the collection of YPbPr color difference signal, indivedual VGA encoding boards also provide other video interface, like DVI, HDMI and CVBS input.VGA encoder major parameter comprises: support resolution, video compression standard, video quality, Network Transmission mode, transmission delay, secondary development SDK etc.

At present; The application of VGA is employed in more increases VGA capture card form in the PC; Cooperate other multi-screen graphics process to show product, can be used for various multi-screens, splicing application, comprise multimedia display, industrial flow demonstration, exploitation demonstration, online query and the mutual consulting system etc. of video wall, monitoring and commanding system; Its shortcoming is that transmission range is shorter, only can carry out point-to-point transmission.

The utility model content

The utility model promptly is the short weak point of transmission range that exists to present VGA encoder, and a kind of VGA encoder that can realize VGA signal long-distance transmissions is provided.

Specifically; The VGA encoder of the described long-distance transmissions of the utility model comprises VGA signal A/D transducer, wherein; Described VGA encoder also comprises interconnective microprocessor and programmable gate array circuit; VGA signal A/D transducer connects the signal input part of programmable gate array circuit, and the signal output part of microprocessor connects ethernet transceiver, and the signal output part of programmable gate array circuit connects VGA signal D/A converter.

Further, described microprocessor is connected with internal memory, program storage and parameter register.

Further, described internal memory comprises random asccess memory (RAM), read-only memory (ROM) or high-speed cache (CACHE).

Further, said programmable gate array circuit is connected with synchronous DRAM.

SDRAM (Synchronous Dynamic Random Access Memory) be synchronous DRAM again, is meant Memory need of work synchronised clock synchronously, and the transmission of inner order and the transmission of data are benchmark with it all; Being meant dynamically that storage array need constantly refresh guarantees that data do not lose; Be meant that at random data are not that linearity is stored successively, but free assigned address carries out reading and writing data.

NVRAM is nonvolatile random access memory (Non-Volatile Random Access Memory) again; Be meant a kind of RAM that still can keep data after the outage; If generically explain nonvolatile memory; That just is meant after the outage, the random access storage device that the data of being stored are not lost.

The FLASH memory; Being flash memory again, is a kind of fixedness (Non-Volatile) internal memory, under the condition that does not have the electric current supply, also can keep data muchly; Its storage characteristics is equivalent to hard disk, and this characteristic flash memory just is able to become the basis of the storage medium of all kinds of pocket digital devices.

Microprocessor is called for short DSP (digital signal processor), is a kind of microprocessor of uniqueness, is the device of handling bulk information with digital signal.Its operation principle is to receive analog signal, converts 0 or 1 digital signal into, digital signal is made amendment, deletes, is strengthened, and in the other system chip, return analogue data or actual environment form to the numerical data decipher.It is not only programmable, and the speed of service can reach the per second number with ten million bar complicated order program in fact the time, considerably beyond general purpose microprocessor, is the computer chip that becomes more and more important in the digitalized electron world.

The programmable gate array circuit; Be called for short FPGA; Be improving constantly of As IC integrated level and the FPGA that occurs (Field Programmable Gate Array is called for short FPGA), the new device that comes by programmable logic device PLD (Programmable Logic Device) development; FPGA not only can be used for single controller spare, and can be used for whole system.

Ethernet transceiver is a two-way transparent switch of Ethernet data signal to the fiber data signal that provide, and can the restriction of ethernet signal through 100 meters of fibre circuit transmission breakthrough transmission ranges be made ethernet network cover and extended greatly.It is far away that fiber optic data communication has communication distance; The communication data capacity is big, does not allow to be subject to characteristics such as interference and has obtained using widely, and optical fiber has been deep into each aspect of all trades and professions; But because original network system all is based on cable communication; The appearance of fiber optical transceiver guarantees smoothly the signal of telecommunication and fiber-optic signal to be changed each other, is applicable to that telecommunications, broadcasting and TV, broadband network etc. need in the Ethernet environment of two-forty, high data traffic and high-performance, high reliability.

The VGA encoder of the described long-distance transmissions of the utility model has following advantage:

1, owing to adopted microprocessor DSP, programmable gate array FPGA circuit, and microprocessor DSP signal output part connects ethernet transceiver, makes the VGA signal can realize long-distance transmissions;

VGA signals collecting, the transmission of VGA signal telecommunication network, the video conference double fluid that 2, can be widely used in the multimedia recording and broadcasting system transmit the various occasions that need gather, transmit, record the VGA signal such as man-machine interface monitoring;

3, microprocessor and programmable gate array circuit are connected with memory respectively, are convenient to signal and data are stored.

Description of drawings

Fig. 1 is the structure principle chart of the utility model embodiment;

Fig. 2 is the structural representation of the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing; VGA encoder to the described long-distance transmissions of the utility model is described, and purpose is for the public better understands described technology contents, rather than to the restriction of said technology contents; All improvement of said VGA encoder being carried out with identical or approximate principle; Comprising the increase and decrease or the replacement of respective element, is purpose to realize basic identical technique effect, then all within the utility model technical scheme required for protection.

Shown in Fig. 1-2; The VGA encoder of the described long-distance transmissions of the utility model comprises VGA signal A/D transducer, also comprises interconnective microprocessor and programmable gate array circuit; VGA signal A/D transducer connects the signal input part of programmable gate array circuit; The signal output part of microprocessor connects ethernet transceiver, and the signal output part of programmable gate array circuit connects VGA signal D/A converter, the external SDRAM that does the frame buffer use of FPGA; Microprocessor DSP is circumscribed with internal memory SDRAM, program storage FLASH and parameter register NVRAM, and audio A/D, D/A converter meet microprocessor DSP.

During work, as shown in the figure, the digital stream after the VGA analog signal is changed through A/D is sent among the FPGA, and one the tunnel sees off, and through D/A conversion output, the outside can connect display; Another road is sent into and is carried out compressed encoding among the DSP, delivers on the network through ethernet transceiver.DSP also can pass through audio A/D, the D/A conversion receives or send audio stream, and can receive the various command of client from network, carries out the configuration and the modification of various parameters such as VGA coding, compressed encoding, flow control.

The VGA encoder of the described long-distance transmissions of the utility model can be realized the remote transmission of signal, is widely used in high definition teaching, recorded broadcast of session, HD video monitoring, computer screen is live and the large-size screen monitors remote transmission.

Claims

1. the VGA encoder of a long-distance transmissions; Comprise VGA signal A/D transducer; It is characterized in that: described VGA encoder also comprises interconnective microprocessor and programmable gate array circuit; VGA signal A/D transducer connects the signal input part of programmable gate array circuit, and the signal output part of microprocessor connects ethernet transceiver, and the signal output part of programmable gate array circuit connects VGA signal D/A converter.

2. VGA encoder according to claim 1 is characterized in that: described microprocessor is connected with internal memory, program storage and parameter register.

3. VGA encoder according to claim 2 is characterized in that: described internal memory comprises random asccess memory, read-only memory or high-speed cache.

4. VGA encoder according to claim 1 and 2 is characterized in that: described programmable gate array circuit is connected with synchronous DRAM.