CN201491187U - Digital audio/video microwave transmission device - Google Patents
Digital audio/video microwave transmission device Download PDFInfo
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- CN201491187U CN201491187U CN2009202090539U CN200920209053U CN201491187U CN 201491187 U CN201491187 U CN 201491187U CN 2009202090539 U CN2009202090539 U CN 2009202090539U CN 200920209053 U CN200920209053 U CN 200920209053U CN 201491187 U CN201491187 U CN 201491187U
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Abstract
A digital audio/video microwave transmission device comprises a media signal conversion module, an audio/video collecting module, an audio/video codec module and a control processing module which are in cascaded connection orderly, and a display terminal which is connected with the control processing module through an Ethernet interface module, a microwave receiving and emitting module with the signal frequency-stabilization phase-lock function, and a spread spectrum dispreading module; the control processing module comprises an encrypting/decrypting device with random displacement and field pole inversion mode. The working frequency of the device is not influenced by temperature change, weather change and other interferences; and the acoustic image signal transmission quality thereof is good, thereby having high security and profound encryption effect.
Description
Technical field
The utility model relates to a kind of microwave transmission unit, relates in particular to a kind of digitlization audio frequency and video microwave transmission unit.
Background technology
Microwave communication and image transmission technology are always in constantly development rapidly in the world.Be transferred to the microwave imagery transmission from microwave data; From the TV network to the satellite transmits; From the analogue transmission to the Digital Transmission, and its in-plant microwave imagery transmission and data communication develop particularly remarkable on military field.But in-plant microwave imagery transmission product is actually rare, and wherein representative product is the microwave imagery transmitting device that Korea S Samsung is provided.Its product has also having of simulation digital, its frequency range has covered band limits such as L, S, C, X, Ku, even has also released the microwave transmission unit of millimere-wave band, but its product price is relatively more expensive, and the millimere-wave band product mainly is to be used for military aspect, and its price is civilian unacceptable.
The microwave sound of current proximity still adopts simulation or simulation to add that numeral realizes as transmitting device is most of, compare with totally digitilized technology, its image, the quality of sound, the reliability of work, all there is a certain distance aspects such as stability, therefore, in-plant microwave sound need be realized total digitalization as transmitting device on the basis of merging the various modern digital communication technology, thereby it is transmitting digitized to improve image, the transfer voice digitlization, remote-controled digitalization, the encryption system digitlization, make its communication performance that comprehensive raising be arranged, be used for real-time collection site image and also can transmit at more abominable transmission environment.
Summary of the invention
The utility model proposes at the problem of above-mentioned audio frequency and video microwave transmission unit of the prior art, its objective is the influence that provides a kind of operating frequency not to be subjected to variations in temperature, Changes in weather and other interference, the high and high digitlization audio frequency and video microwave transmission unit of communication security degree of the transmission quality of audio-visual signal.
The utility model to achieve the above object, a kind of digitlization audio frequency and video microwave transmission unit is provided, a kind of digitlization audio frequency and video microwave transmission unit, comprise the media signal modular converter, audio-video collection module, audio/video encoding/decoding module, control treatment module, ethernet interface module, microwave receiving transmitter module, and display terminal; Described media signal modular converter, audio-video collection module, audio/video encoding/decoding module, control treatment module cascade successively connect, described control treatment module is connected with display terminal with described microwave receiving transmitter module respectively by described ethernet interface module, and described microwave receiving transmitter module comprises a receiver/transmitter and antenna; In the audio-video signal process of transmitting: after the conversion of extraneous media signal through described media signal modular converter and audio-video collection module, enter the audio/video encoding/decoding module and be encoded, be sent to described microwave receiving transmitter module by described ethernet interface module and send; In the audio-video signal receiving course: described microwave receiving transmitter module with received signal by described ethernet interface module and control treatment module, send described audio/video encoding/decoding module to and decode, the audio-video signal of decoding is sent to described display terminal by described control treatment module by described Ethernet interface;
Digitlization audio frequency and video microwave transmission unit of the present utility model also comprises a spread spectrum despreading module that is connected with described control treatment module, and it carries out despreading and the audio-video signal that sends is carried out spread spectrum the audio-video signal that receives.
Described control treatment module comprises the encrypting and decrypting device of a random file and a polarity inversion mode; In the signal process of transmitting, the encrypting and decrypting device in the control treatment module is encrypted and signal is delivered to spread spectrum despreading module carry out spread processing the audio/video coding signal from the audio/video encoding/decoding module; In the signal receiving course, spread spectrum despreading module is carried out the despreading processing to the signal from described ethernet interface module, is decrypted by the encrypting and decrypting device in the control treatment module then, sends described audio/video encoding/decoding module again to and decodes.
Receiver/transmitter in the described microwave receiving transmitter module comprises a frequency stabilization phase locking unit, and when reception and launched microwave signal, it is phase-locked that signal is carried out frequency stabilization.
The beneficial effects of the utility model are:
● as above-mentioned structure, because of comprising spread spectrum despreading module in the utility model, audio-video signal is carried out despreading and spread spectrum, the radio frequency bandwidth that makes transmission information is much larger than the bandwidth of information own, improved the signal to noise ratio of transmitting device of the present utility model, the influence of interference is reduced, and in the microwave receiving transmitter module, add the frequency stabilization phase locking unit, make the operating frequency of transmitting device of the present utility model stable, be not subjected to the influence of variations in temperature, Changes in weather and other interference, guaranteed the transmission quality and the communication security of audio-visual signal.
● as above-mentioned structure, because comprise the encrypting and decrypting device of a random file and a polarity inversion mode in the control treatment module of the present utility model, therefore, in the video base band, signal is carried out the encryption or the deciphering of a random file and a polarity inversion, make the signal transmission of the utility model device have the cipher round results of the degree of depth and good fail safe.
Description of drawings
Fig. 1: the structural representation of the utility model digitlization audio frequency and video microwave transmission unit one embodiment;
Fig. 2: the flow chart of data processing figure of each module in reception and process of transmitting among the utility model digitlization audio frequency and video microwave transmission unit one embodiment.
Embodiment
Further specify the architectural feature of digitlization audio frequency and video microwave transmission unit of the present utility model below in conjunction with accompanying drawing.
As shown in Figure 1: the utility model embodiment provides a kind of digitlization audio frequency and video microwave transmission unit, comprise media signal modular converter 1, audio-video collection module 2, audio/video encoding/decoding module 3, control treatment module 4, ethernet interface module 7, microwave receiving transmitter module 6 and display terminal 8, described microwave receiving transmitter module 6 comprises a receiver/transmitter 602 and antenna 601; Described media signal modular converter 1, audio-video collection module 2, audio/video encoding/decoding module 3 and control treatment module 4 cascade successively are connected, and described control treatment module 4 is connected with display terminal 8 with described microwave receiving transmitter module 6 by described ethernet interface module 7; Also comprise a spread spectrum despreading module 5 that is connected with described control treatment module 4, in process of transmitting, can carry out spread processing the audio-video signal of crossing through the audio/video encoding/decoding module coding; It carries out despreading to the audio-video signal of the demodulation that receives through microwave receiving device and handles in receiving course, the function of its spread spectrum and despreading all realizes under control treatment module 4 controls; Described control treatment module 4 comprises the encrypting and decrypting device of a random file and a polarity inversion mode, the audio-video signal in transmission and the receiving course is carried out the encryption and decryption of a random file and a polarity inversion mode and handles.Described receiver/transmitter 602 comprises a frequency stabilization phase locking unit, when reception and launched microwave signal, signal is carried out the phase-locked processing of frequency stabilization.
Each module among one embodiment of the digitlization audio frequency and video microwave transmission unit of the present utility model among Fig. 1 is specially:
Described media signal modular converter 1, be used for gathering the outside audio-visual signal that provides by extraneous media signal, and be converted to the signal of telecommunication and flow to audio-video collection module 2, be in the present embodiment: KJ-401 pick-up and 1/4 " SHARP CCD colour TV camera SBE-VC862.
Described audio-video collection module 2, be used for media signal modular converter 1 output signal is sampled, and provide audio-video signal from analog signal to the digital signal translation function, in the present embodiment, employing can become analog signal conversion the SAA7114 chip of digital signal that vision signal is sampled, and adopts the CS5340 chip that audio signal is sampled.
Described audio/video encoding/decoding module 3 comprises the compression standard to audio signal: MPGA-1Audio Layer2 and to the compression standard of vision signal: MPEG4; Adopt IME6400 chip and K4S561632H chip (a kind of SDRAM chip) in the present embodiment, firmware can independently be realized being the encoding and decoding compression of standard with MPEG4 and being the encoding and decoding compression of standard to audio signal with MPGA-1Audio Layer2 vision signal on the sheet of this chip; User's manual according to corresponding chip, cascade between above-mentioned audio-video collection module 2 and the audio/video encoding/decoding module 3, specifically can be: the MCLK of CS5340, LRCK, SCLK, SDATA be connected with CCLK, LRCK, SCLK, the ADATA pin of IME6410 chip respectively, and the VPO of SAA7114, LLC2, HREE, VREF, CREF, RST0 respectively with the VD[15:0 of IME6410 chip], PCLK, HSYNC, VSYNC, DYALID, FIELD pin be connected.In order further to reduce cost, adopt detachable physical structure between audio-video collection module 2 in the digitlization audio frequency and video microwave transmission unit of the present utility model and the described audio/video encoding/decoding module 3, specifically can with two physically independently PCB (printed circuit board (PCB)) constitute, the signal lines and the power line that connect the device on the two boards by inserting slot construction, can realize cold plug function, make some only need under the situation of simplex of received signal, the user can remove described audio-video collection module 2 from hardware module, the user class that realizes the utility model device hardware freely customizes, freely dispose by the user, save cost.
Described control treatment module 4, the transmission of the audio-video signal of control device and receiving course, adopt the ARM920T chip in the present embodiment, this chip interface is abundant, low in energy consumption, can satisfy and every other hardware module between connection request, be built-in with ethernet controller, realize MAC (media interviews control) layer function; User's manual according to corresponding chip, cascade between above-mentioned audio/video encoding/decoding module 3 and the control treatment module 4, specifically can be: the MODE[1:0 of the IME6410 chip of described audio/video encoding/decoding module], ADS, FRD pin be connected to the 3.3V digital power by a slice pull-up resistor respectively, USEOCK and BW pin ground connection, other pin: NCS, NRD, NWR, HADR[4:0], HDATA[7:0] respectively with nECS0, nOE, nWBE, the ADDR[4:0 of control treatment module ARM920T chip], XDATA[7:0].
Described spread spectrum despreading module 5 is in the present embodiment for being programmed the fpga chip with spread spectrum despreading function: EP1S10B672C6 (Stratix series), this fpga chip has embedded hardware multiplier and takes advantage of, adds the Programmable DSPs module of structure, the high speed signal that is particularly suitable in the present embodiment is handled needs, satisfies the spread processing speed of the utility model to the back signal of encoding fully.According to the user's manual of corresponding chip, above-mentioned control treatment module 4 (ARM902T chip) is connected specifically with spread spectrum despreading module 5 (EP1S0B672C6 chip): the GPB7 of ARM902T～10 are connected with TMS, TDI, TCK, the TD0 of fpga chip respectively.
Described microwave receiving transmitter module 6 comprises a receiver/transmitter 602 and antenna 601: in the present embodiment, receiver/transmitter 602 is a kind of products of realizing the phase-locked function of frequency stabilization, and model is: BreezeNET DS 11 ver 4 are provided by alvarion company.This product, the machine of transmitting and receiving are one, and this receiver/transmitter is connected with control treatment module 4 by ethernet interface module 7, and signal transmission distance is far away, and transmission speed is fast, and the distorted signals decay is little.Wherein transmitter is mainly realized video, voice signal are carried out the digital compression coding, and transmit by the less radio-frequency channel modulation back; Receiver mainly realizes and will be reduced into video, audio data stream from the signal demodulation that air interface is received, is converted to video then, audio signal is exported.For BreezeNET DS 11 ver 4 receiver/transmitters 602 that above-mentioned alvarion company provides, the antenna 601 in the present embodiment can have a lot of selections according to transmission range, the antenna model that general random is used is 24dBi, 70AZ, 100EL, 61x91x38cm (872212).Transmitter terminal generally adopts omnidirectional's ride antenna at present, be convenient to on-the-spot emergent the use, saved the work of signal searching and antenna alignment, for obtaining laser propagation effect preferably, also can adopt gain directional antenna, selected the emission of S section in the present embodiment, transmitting power is 0.1-700mW, antenna form is that omnidirectional is whiplike, directed Yagi spark gap, deletes shape, and gain is at the optional YWSX antenna of 8-32dB.
Described ethernet interface module 7 is the utility model piths in the present embodiment, and the utility model realizes control treatment module 4 (ARM902T chip) by ethernet interface module and PC or microwave receiving transmitter module 6 are connected arbitrarily; Control treatment module 4 (ARM902T chip) inside has comprised the ethernet mac controller, but physical layer interface is not provided, and therefore, needs an external physical chip so that the access passage of Ethernet to be provided.Ethernet interface module 7 comprises ethernet controller and RTL8201 chip, DM9161 chip and the network transformer PE68515 of ARM920T chip internal in the present embodiment, the ethernet physical layer interface device that these are commonly used: RTL8201 chip, DM9161 chip, MII interface and traditional 7 line system network interfaces all are provided, because the mac controller of existing band MII interface in the ARM902T chip, and the RTL8201 chip also provides the MII interface, being defined in the databook of various signals is also very clear and definite, makes things convenient for the production of device.
Described display terminal 8 is a computer that Ethernet interface is arranged in the present embodiment;
As shown in Figure 2, the left side sends signal process, audio-video signal is the following flow direction: audio-video signal carries out multi-media signal to the conversion of the signal of telecommunication and signal of telecommunication output the carrying out A/D conversion 200 of 2 pairs of media signal modular converters of audio-video collection module through media signal modular converter 1, the digital signal of output is transferred to audio/video encoding/decoding module 3 with DMA (direct memory access (DMA)) transmission means again and carries out audio coding and audio/video flow Synthetic 2 01, code signal is cached among the SDRAM of audio/video encoding/decoding module 3, send interrupt requests order 202 to control treatment module 4 then, 4 free time of control treatment module then can be read data in the buffer area with the speed of 1Mbps by dma mode, this baseband signal is carried out the encryption of random file and polarity inversion mode and is stored in its internal RAM 203,5 pairs of these signals of spread spectrum despreading module carry out spread processing 204, be sent to the microwave receiving transmitter module by ethernet interface module 7 again, comprise that specifically the signal of at first crossing to spread processing adds Ethernet frame head (comprising preamble field and start of frame delimiter), generate the CRC check sign indicating number then, at last these data are sent to Ethernet and get on; Microwave receiving transmitter module 6 will decode, go to be buffered in the sheet after the steps such as frame head and address check in process from the Frame that Ethernet is received.After CRC (cyclic redundancy check (CRC)) sign indicating number passes through, it will be according to the initial configuration situation, notice ethernet interface module 7 (RTL8019AS) has been received Frame, read built-in FIFO buffer in the ethernet interface module 7 (RTL8019AS) with the DMA transmission mode at last, the storage data frame is in the SDRAM of microwave device, signal is carried out the phase-locked processing of frequency stabilization and modulates after 207, launch through antenna 601 at last.
As shown in Figure 2, audio-video signal is the following flow direction in the received signal flow process on right side: antenna 601 searches from source end signal 208, the signal that receives is stored among the SDRAM of microwave receiving transmitter module 209, send interrupt request singal to control treatment module 4 simultaneously, whether allow 210 to detect access to netwoks, if the network free time, then send data to Ethernet, specifically comprise: data are sent in the built-in buffer of ethernet interface module 7 (RTL8019AS), again data are added Ethernet frame head (comprising preamble field and start of frame delimiter), generate the CRC sign indicating number then, at last these data are sent to Ethernet and get on.The Frame that control treatment module 4 is received from Ethernet is being buffered in the built-in FIFO sheet 211 through decoding, after going steps such as frame head and address check.Notice ethernet interface module 7 (RTL8019AS) has been received Frame, read built-in FIFO buffer in the ethernet interface module 7 (RTL8019AS) with the DMA transmission mode at last, to data deciphering and storage data frame in the SDRAM of control treatment module 4 212, decrypted signal is read by spread spectrum despreading module 5 (FPGA) and carries out despreading processing 213 then, control treatment module 4 moves to despread signal among the SDRAM1 of audio/video encoding/decoding module 3 (IME6410) 214, audio/video encoding/decoding module 3 (IME6410) is carried out decoding processing 215 to this audio-video signal, at last, control treatment module 4, judge whether access to netwoks allows 216, if allow, then this decoded signal is sent to display terminal 217 by ethernet interface module 7.
In the audio frequency and video process of transmitting, the signal after the spread processing sends described microwave receiving transmitter module to by described ethernet interface module 7; If near available fixedly Ethernet is arranged, then the utility model device does not just need to dispose microwave receiving transmitter module 6: can be with the source signal of gathering and handling, send to terminal on the network through fixing Ethernet, behind the terminal operation despreading software, just can be at the long-range signal that receives, the rerun decoding software of MPGA-1 Audio Layer2 and MPEG4 promptly can be seen the realtime graphic of remote scene, can save cost like this.
Claims (5)
1. a digitlization audio frequency and video microwave transmission unit comprises the media signal modular converter, audio-video collection module, audio/video encoding/decoding module, control treatment module, ethernet interface module, microwave receiving transmitter module, and display terminal; Described media signal modular converter, audio-video collection module, audio/video encoding/decoding module, control treatment module cascade successively connect, described control treatment module is connected with display terminal with described microwave receiving transmitter module respectively by described ethernet interface module, and described microwave receiving transmitter module comprises a receiver/transmitter and antenna; It is characterized in that:
Also comprise a spread spectrum despreading module that is connected with described control treatment module, be used for described audio-video signal is carried out spread spectrum and despreading;
Described control treatment module comprises the encrypting and decrypting device of a random file and a polarity inversion mode;
Described receiver/transmitter comprises a frequency stabilization phase locking unit.
2. digitlization audio frequency and video microwave transmission unit according to claim 1 is characterized in that: described spread spectrum despreading module is the fpga chip with spread spectrum despreading function.
3. digitlization audio frequency and video microwave transmission unit according to claim 1 is characterized in that: between described audio-video collection module and the described audio/video encoding/decoding module be can cold plug physical connection.
4. digitlization audio frequency and video microwave transmission unit according to claim 3 is characterized in that: described physical structure that can cold plug is to be made of two printed circuit board (PCB)s that connect the respective signal line by slot.
5. digitlization audio frequency and video microwave transmission unit according to claim 1 is characterized in that: described audio/video encoding/decoding module comprises the compression standard to audio signal: MPGA-1 AudioLayer2 and to the compression standard of vision signal: MPEG4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202090539U CN201491187U (en) | 2009-09-02 | 2009-09-02 | Digital audio/video microwave transmission device |
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| CN2009202090539U CN201491187U (en) | 2009-09-02 | 2009-09-02 | Digital audio/video microwave transmission device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291567A (en) * | 2011-04-14 | 2011-12-21 | 西安烽火电子科技有限责任公司 | Microwave digital image transmission system |
| CN106788906A (en) * | 2017-03-10 | 2017-05-31 | 安徽师范大学 | A kind of Ethernet audio transmission system based on FPGA |
| CN107566686A (en) * | 2017-09-30 | 2018-01-09 | 长沙准光里电子科技有限公司 | Intelligent image processing unit |
| CN111896956A (en) * | 2020-08-10 | 2020-11-06 | 西安电子科技大学 | Real-time microwave correlation imaging device and method based on FPGA and DSP |
-
2009
- 2009-09-02 CN CN2009202090539U patent/CN201491187U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291567A (en) * | 2011-04-14 | 2011-12-21 | 西安烽火电子科技有限责任公司 | Microwave digital image transmission system |
| CN102291567B (en) * | 2011-04-14 | 2013-10-02 | 西安烽火电子科技有限责任公司 | Microwave digital image transmission system |
| CN106788906A (en) * | 2017-03-10 | 2017-05-31 | 安徽师范大学 | A kind of Ethernet audio transmission system based on FPGA |
| CN107566686A (en) * | 2017-09-30 | 2018-01-09 | 长沙准光里电子科技有限公司 | Intelligent image processing unit |
| CN111896956A (en) * | 2020-08-10 | 2020-11-06 | 西安电子科技大学 | Real-time microwave correlation imaging device and method based on FPGA and DSP |
| CN111896956B (en) * | 2020-08-10 | 2023-10-20 | 西安电子科技大学 | Real-time microwave associated imaging device and method based on FPGA and DSP |
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Granted publication date: 20100526 Termination date: 20100902 |