CN1452085A - Bidirectional video and audio real time transmission method based on satellite link - Google Patents
Bidirectional video and audio real time transmission method based on satellite link Download PDFInfo
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- CN1452085A CN1452085A CN 02117228 CN02117228A CN1452085A CN 1452085 A CN1452085 A CN 1452085A CN 02117228 CN02117228 CN 02117228 CN 02117228 A CN02117228 A CN 02117228A CN 1452085 A CN1452085 A CN 1452085A
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Abstract
A bidirectional audio-video real-time transmission method based on satellite link includes acquiring video and audio data by the PC of transmitter, data compression, combining the audio data with video data, transmitting it along with the IP address and port number to satellite link, receiving by receiver, transmitting to relative PC, splitting audio data from video data, decompression, and displaying image while reproducing sound.
Description
Technical field
The present invention relates to the method for a kind of two-way video, audio frequency real-time Transmission, particularly relate to the method that a kind of link via satellite carries out two-way video, audio frequency real-time Transmission.
Background technology
The application of communication society computer network and video, Audiotechnica makes becoming alternately of information more and more fast, directly perceived, people by all means, as PSTN, ISDN, optical fiber, the Internet etc., carry out the thing that video conference, tele-medicine, remote teaching etc. can not realize in the past.But under some particular cases, as field work, military surveillance etc., above-mentioned various information transmission approach can not be used effectively, and satellite communication does not then have the region restriction, help the light realization of people to interconnect at a distance.
In the past, video, audio transmission method adopted hardware compression more, promptly a special compressed and decompressed card, not only cost costliness, and interconnection technique complexity need be installed in PC; Speed along with upgradings such as computer motherboard technology, bussing techniques improves constantly simultaneously, and the frequency of the compressed and decompressed card that need more renew is also more and more faster, and cost pressure is increasing.Equipment as common in the market this type of transmission method of employing is the PictureTel 550 type products that U.S. PictureTel company produces, it is a kind of video conferencing system based on PC, it has just used the mode of hardware compression, and upgrading is difficulty.The present invention has then adopted the mode of software codec, not only greatly reduces system cost, and the influence that not substituted by hardware technology, when code decode algorithm improves, only needs to change corresponding software module and gets final product, and makes upgrading become easy.
Summary of the invention
The present invention is exactly in order to solve above-mentioned deficiency, with the real-time Transmission of two-way video, audio frequency via satellite system finish, the coding/decoding system to transmission signals improves simultaneously, hardware compression has been become the mode of software codec.
The present invention seeks to realize like this: a kind of method of carrying out two-way video, audio frequency real-time Transmission based on satellite link provided by the invention, may further comprise the steps: at first, PC by transmitting terminal is gathered video, voice data, this PC compresses video data and voice data then, and the video data after will compressing and voice data combine and be beneficial to synchronously and Network Transmission; Then this PC passes the IP address of this complex data and receiving end PC and the port numbers communication link by transmitting terminal to satellite link, the communication link of process receiving end sends to and has on corresponding IP address and the corresponding ports PC again,, the decompression compound of receiving end PC through separating of video, voice data, on the receiving end PC, show corresponding picture information, play sound simultaneously.
The invention has the advantages that: this method not only can be saved cost, improves system update replacement speed, and can realize point-to-point, a bit 2 real time bidirectional is looked audio transmission, on every PC, also can receive decoding 1-3 road video/audio signal stream simultaneously.For CIF pixel format (352*288 resolution), decoded frame rate can reach that 15 frames/more than second, occupied bandwidth is less than 300Kb/s (wherein audio stream accounts for the 64K bandwidth).The clear image smoothness, visual sense is preferable.Modulator-demodular unit is also finished the RS encoding and decoding at whole satellite channel, thereby improves the reliability of satellite channel work, reduces the bit error rate of channel.
Description of drawings
Accompanying drawing 2 is formed synoptic diagram for communication link;
Accompanying drawing 3 is process flow diagrams of transmitting terminal program;
Accompanying drawing 4 is process flow diagrams of receiving end program.
Drawing is described as follows:
2-IDU unit, 1-ODU unit (satellite outdoor unit) (the satellite indoor unit is a satellite modem) 3-router four-hub 5-satellite antenna
Embodiment
Embodiment:
The hardware components of total system is interconnected by PC, communication link, satellite link and forms.As shown in Figure 1.Communication link is responsible for the interactive communication of data between each PC, and the communication link that satellite link provides for the satellite company of renting is responsible for receiving the data of being sent by communication link, and the data that receive are mail to the communication link that links to each other with the purpose PC.As can see from Figure 1, one-piece construction is a star, every PC also can develop subnet that becomes a star or the LAN (Local Area Network) with a plurality of subnets.During actual the use numerous PC terminal can be arranged, only draw three among the figure.
In every PC, move the encoding and decoding and the communication software of video, audio frequency, and configuration sound card, video frequency collection card, audio amplifier, microphone and stylus, sound card is responsible for the collection and the broadcast of sound, video frequency collection card and stylus are responsible for the collection of video image, and audio amplifier and microphone are received the voice output and the input interface of sound card respectively.
PC (or the LAN (Local Area Network) that is become by multiple pc mechanism) links to each other with the 10/100BASE-T interface of router by hub, data is delivered to the V.35 external tapping of router or from these interface reception data.Be connected the V.35 interface of two unit by cable V.35 between router and the IDU unit 2, thereby finish exchanges data.In this connected, router three was as data terminal equipment (DTE), accepted synchronous clock and according to specifying baud rate communication; IDU unit 2 provides synchronous clock and designated communication speed as Digital Circuit-terminating Equipment (DCE).IDU unit two immediate frequency cables of 2 usefulness are connected with ODU unit 1, to realize the transmitted in both directions of modulation, demodulation.ODU unit 1 usefulness radio-frequency cable and satellite antenna 5 connect.What the IDU unit 2 in this programme used is the SDM300A type modulator-demodular unit that EFData company produces, and router three is the Quidway2631 type router of Huawei Company.
The transmitting terminal PC can send video/audio to one or two receiving end PC among the present invention; The receiving end PC can receive simultaneously that one to three road transmitting terminal PCs send looks audio compression data stream.Accompanying drawing 4 and accompanying drawing 5 are respectively the process flow diagrams of program in transmitting terminal and the receiving end PC.
In the accompanying drawing 3, after program brings into operation, the voice data that the transmitting terminal PC is imported into by microphone from the sound card collection, the video data that imports into by stylus from the video frequency collection card collection; Video data is carried out H.263 compression algorithm, voice data is carried out G.711 compression algorithm, video data after will compressing then and voice data combine and are beneficial to synchronously and Network Transmission; Then judge whether to send data on two receiving end PCs, then the communication link of the video/audio data after compound by transmitting terminal passed to satellite link in this way, pass through the communication link of receiving end again, send on the IP address of corresponding two receiving end PCs and the corresponding ports number, as not being then only to send complex data to a PC; Transmission finishes, and continues to gather next video/audio data.
In the accompanying drawing 4, after program brings into operation, the receiving end PC is in waiting status, video/audio complex data after compression is arranged is through the communication link of transmitting terminal link via satellite, communication link through receiving end is sent on the receiving end PC again, it is three data stream that the transmitting terminal PC is sent that the receiving end PC can receive three the tunnel at most, and respectively corresponding three different port numbers have three different windows to show the picture information that receives; After the receiving end PC receives data, at first according to data stream with status word judge its destination slogan, H.263 algorithm compound through separating of video/audio data, video data decompresses and the G.711 algorithm decompression process of voice data, picture information is shown to the corresponding window of receiving end PC, plays sound simultaneously; Continue to receive the data that next group transmits then.
Claims (5)
1, a kind of based on satellite link two-wayly look, audio real time transmission method, it is characterized in that: may further comprise the steps: gather video, voice data by the PC of transmitting terminal earlier, this PC compresses video data and voice data then, and the video data after will compressing and voice data combine and be beneficial to synchronously and Network Transmission; Then this PC passes the IP address of this complex data and receiving end PC and the port numbers communication link by transmitting terminal to satellite link, the communication link of process receiving end sends to and has on corresponding IP address and the corresponding ports PC again,, the decompression compound of receiving end PC through separating of video, voice data, on the receiving end PC, show corresponding picture information, play sound simultaneously.
2, as claimed in claim 1ly carry out the method for two-way video, audio frequency real-time Transmission based on satellite link, it is characterized in that: the transmitting terminal PC can send video/audio to one or two receiving end PC simultaneously.
3, as claimed in claim 1ly carry out the method for two-way video, audio frequency real-time Transmission based on satellite link, it is characterized in that: the receiving end PC can receive simultaneously that one to three road transmitting terminal PCs send looks audio compression data stream.
4, as claimed in claim 1ly carry out the method for two-way video, audio frequency real-time Transmission, it is characterized in that: transmitting terminal and receiving end PC can develop subnet that becomes a star or LAN (Local Area Network) with a plurality of subnets based on satellite link.
5, as claimed in claim 1ly carry out two-way video based on satellite link, the method of audio frequency real-time Transmission, it is characterized in that: communication link is by satellite outdoor unit (1), satellite indoor unit (2), router (3), hub (4) and satellite antenna (5) constitute, satellite outdoor unit (1) is mainly used in the radiofrequency signal that will receive and downconverts to intermediate-freuqncy signal, pass to satellite indoor unit (2) and carry out demodulation process, simultaneously satellite indoor unit (2) is sent intermediate-freuqncy signal carry out up-conversion, become radiofrequency signal, giving satellite antenna (5) sends, satellite indoor unit (2) is mainly used in to be finished receiving, the modulation and demodulation that sends signal is handled, and the signaling conversion of the data stream of satellite communication and ground communication network and physical connection conversion, router (3) and hub (4) are responsible for PC and satellite indoor unit (2) are coupled together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02117228 CN1252608C (en) | 2002-04-18 | 2002-04-18 | Bidirectional video and audio real time transmission method based on satellite link |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02117228 CN1252608C (en) | 2002-04-18 | 2002-04-18 | Bidirectional video and audio real time transmission method based on satellite link |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1452085A true CN1452085A (en) | 2003-10-29 |
| CN1252608C CN1252608C (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 02117228 Expired - Fee Related CN1252608C (en) | 2002-04-18 | 2002-04-18 | Bidirectional video and audio real time transmission method based on satellite link |
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| CN (1) | CN1252608C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401477A (en) * | 2019-07-01 | 2019-11-01 | 闽江学院 | A kind of method of long range fishing information collection passback processing |
-
2002
- 2002-04-18 CN CN 02117228 patent/CN1252608C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401477A (en) * | 2019-07-01 | 2019-11-01 | 闽江学院 | A kind of method of long range fishing information collection passback processing |
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| Publication number | Publication date |
|---|---|
| CN1252608C (en) | 2006-04-19 |
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