CN106791534A - A kind of multi-channel synchronous storage back method of cockpit video-with-audio recording device - Google Patents
A kind of multi-channel synchronous storage back method of cockpit video-with-audio recording device Download PDFInfo
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- CN106791534A CN106791534A CN201611051067.3A CN201611051067A CN106791534A CN 106791534 A CN106791534 A CN 106791534A CN 201611051067 A CN201611051067 A CN 201611051067A CN 106791534 A CN106791534 A CN 106791534A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
The invention belongs to avionics field, and in particular to a kind of multi-channel synchronous storage back method of cockpit video-with-audio recording device.In order to ensure accident investigation accurately and reliably, it is necessary to which the audio-frequency information that synchronization cockpit video-with-audio recording device is recorded being capable of synchronized playback with video information.During the present invention storage data storage is carried out according to the mode of packet, the structure of packet includes data packet head and data inclusion, data packet head and data inclusion synthesize after an entirety by after the packet sequence number sequence in data packet head with sequential storage in the way of write storage medium；In data readback, the synchronized playback of data is completed by parsing information.The present invention can effectively Solving Multichannel audio, video and Data-Link data, the correlation of related audio, video and Data-Link data can be easily provided in regular maintenance and accident investigation.
Description
Technical field
The invention belongs to avionics field, and in particular to a kind of multi-channel synchronous of cockpit video-with-audio recording device are deposited
Storage back method.
Background technology
Cockpit video-with-audio recording device can for accident investigation personnel provide the various ambient sounds of driving cabin and flight crew it
Between language communication, driving cabin environmental information, the Non-languae communication of flight crew, the work of flight crew, instrument display selection
And the key message such as state.In order to ensure accident investigation accurately and reliably, and ensure voice data, video data with for the moment
The accurate correlation at quarter, it is necessary to which the audio-frequency information that synchronization cockpit video-with-audio recording device is recorded can with video information
Synchronized playback.
The content of the invention
The invention provides a kind of audio-visual synchronization storage back method, for cockpit video-with-audio recording device institute acquisition and recording
Multi-channel data can keep synchronous.
The multi-channel synchronous storage back method of cockpit video-with-audio recording device of the invention, according to the side of packet during storage
Formula carries out data storage, and the structure of packet includes data packet head and data inclusion, wherein data packet head include starting bag mark,
Data type, channel number, packet length, data length, packet sequence number, packet mark and packet header verification and, data inclusion includes
Data compression scheme, data compression rate and sample rate, UTC time, Beijing time, lapse of time, faulty word, configuration library name,
Production code member, aircraft number, pilot numbering, valid data and inclusion verification and；Data packet head and data inclusion synthesize one
After entirety by data packet head packet sequence number sequence after with sequential storage in the way of write storage medium；In data readback,
By parsing data type, channel number, data length, serial number, bag mark, data compression scheme, data compression rate and sampling
Rate, UTC time, Beijing time and lapse of time, the synchronized playback of data is completed by information above.
Further, the data packet head totally 20 bytes, wherein initial bag mark be fixed as " 0xEB, 0x90,0xEB,
0x90 ", totally 4 bytes；Data type is 2 bytes, is respectively used to mark audio, video or Data-Link data；Channel number is 2
Individual byte, for distinguishing different data channel；Packet length totally 4 bytes, the length for identifying whole packet；Data are long
It is 4 bytes to spend, and for identifying effective data length, packet sequence number is 1 byte, the order for identifying bag；Packet
1 byte is masked as, is starting bag or subsequent packet for identifying current bag, packet header verifies and is 2 bytes.
Further, the data inclusion totally 2028 bytes, wherein data compression scheme totally 2 bytes, for identifying
It is which kind of mode data compression is carried out using；Data compression rate and sample rate totally 2 bytes, compression ratio for mark data or
Sample rate；UTC time totally 8 bytes, for identifying the GMT；Beijing time totally 8 bytes, for identifying cockpit sound
Video recorder local zone time；Since lapse of time, totally 6 bytes calculate starting record, identify this bag data relative to
The difference of UTC time；Faulty word totally 4 bytes, cockpit video-with-audio recording device current state is analyzed for data analytic expression；Configuration
Library name totally 8 bytes, completed for indicating products configuration state, when the information is debugged according to different aircrafts in factory plus
Carry；Production code member totally 8 bytes, for indicating product code numbering, the information is complete when being debugged in factory according to the different numberings of product
Into loading, aspect or the Product Status that dispatch from the factory；Aircraft number totally 14 bytes, for recognizing aircraft number, the information is by outfield
Ground service attendant insert；Pilot numbers totally 2 bytes, and for recognizing that aircraft person numbers, the information is safeguarded by outfield ground service
Personnel insert；Valid data totally 1964 bytes；Inclusion verification and totally 2 bytes.
Beneficial effect：The present invention can effectively Solving Multichannel voice data, video data and Data-Link data synchronization return
Put problem.Following items beneficial effect can be brought：
A) present invention can effectively Solving Multichannel audio, video and Data-Link data, can be adjusted in regular maintenance and accident
The convenient correlation that related audio, video and Data-Link data are provided when looking into；
B) not only include Beijing time in data in data storage method of the invention, also include UTC time, can be with
Two correlations of time are easily obtained, it is convenient synchronous with the other equipment retention time on aircraft.
Brief description of the drawings
Fig. 1 is packet composition schematic diagram of the present invention；
Fig. 2 is data packet head composition schematic diagram of the present invention；
Fig. 3 is data inclusion composition schematic diagram of the present invention；
Fig. 4 is data memory format schematic diagram of the present invention (by taking video data as an example)；
Fig. 5 is data syn-chronization playback decoding schematic diagram of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, refers to Fig. 1 to Fig. 5, table 1 to table 2.A kind of cockpit
Video-with-audio recording device multi-channel sound video data synchronization storage method in order to ensure different types of data, between different pieces of information passage
Data can keep synchronous when data readback, carry out data storage according to data packet mode during its data storage.
As shown in figure 1, the packet in a kind of cockpit video-with-audio recording device multi-channel sound video data synchronization storage method
Including data packet head and data inclusion.
As shown in Fig. 2 the packet in a kind of cockpit video-with-audio recording device multi-channel sound video data synchronization storage method
Head includes that data packet head includes bag mark, data type, channel number, packet length, data length, packet sequence number, packet mark
With packet header verification and, totally 20 bytes, wherein bag mark is fixed as " 0xEB 0x90 0xEB 0x90 ", totally 4 bytes；Data
Type is 2 bytes, is respectively used to mark audio, video and Data-Link data；Channel number is 2 bytes, for distinguishing difference
Data channel；Packet length totally 4 bytes, the length for identifying whole packet；Data length is 4 bytes, for marking
Know effective data length, packet sequence number is 1 byte, due to the order of mark bag；Packet is masked as 1 byte, is used for
The current bag of mark is starting bag or subsequent packet, and packet header verifies and is 2 bytes.
As shown in figure 3, the packet in a kind of cockpit video-with-audio recording device multi-channel sound video data synchronization storage method
Body includes data compression scheme, data compression rate and sample rate, UTC time, Beijing time, lapse of time, faulty word, repository
Title, production code member, aircraft number, pilot's numbering, valid data and inclusion verification and totally 2028 bytes.Wherein data pressure
Contracting mode totally 2 bytes, are which kind of mode to carry out data compression using for identifying；Data compression rate and sample rate totally 2 words
Section, for the compression ratio or sample rate of mark data；UTC time totally 8 bytes, for identifying the GMT；During Beijing
Between totally 8 bytes, for identifying cockpit video-with-audio recording device local zone time；Lapse of time, totally 6 bytes, open from record is started
Begin to calculate, identify difference of this bag data relative to UTC time；Faulty word totally 4 bytes, cockpit is analyzed for data analytic expression
Video-with-audio recording device current state；Library name totally 8 bytes are configured, for indicating products configuration state, the information is according to difference
Aircraft loading is completed when being debugged in factory；Production code member totally 8 bytes, for indicating product code numbering, the information is according to product
Different numberings complete loading, aspect or the Product Status that dispatch from the factory when being debugged in factory；Aircraft number totally 14 bytes, for knowing
Other aircraft number, the information is inserted by outfield ground service attendant；Pilot numbers totally 2 bytes, for recognizing that aircraft person compiles
Number, the information is inserted by outfield ground service attendant；Valid data totally 1964 bytes；Inclusion verification and totally 2 bytes.
As shown in figure 4, in a kind of cockpit video-with-audio recording device multi-channel sound video data synchronization storage method, data packet head
With data inclusion totally 2048 bytes, write in the way of sequential storage after the packet sequence number sequence in packet header after one entirety of synthesis
Enter storage medium；
As shown in figure 5, a kind of cockpit video-with-audio recording device multi-channel sound video data synchronization storage method is in data readback
When, by parse data type, data channel, data length, serial number, bag mark, data compression scheme, data compression rate and
Sample rate, UTC time, Beijing time, lapse of time, data syn-chronization is completed by information above.
The data packet head structural table of table 1
The data inclusion of table 2 composition is illustrated
Claims (3)
1. a kind of multi-channel synchronous of cockpit video-with-audio recording device store back method, it is characterised in that：According to data during storage
The mode of bag carries out data storage, and the structure of packet includes data packet head and data inclusion, and wherein data packet head includes starting
Bag mark, data type, channel number, packet length, data length, packet sequence number, packet mark and packet header verify and, packet
Body includes data compression scheme, data compression rate and sample rate, UTC time, Beijing time, lapse of time, faulty word, repository
Title, production code member, aircraft number, pilot numbering, valid data and inclusion verification and；Data packet head and data inclusion synthesize
After one entirety by data packet head packet sequence number sequence after with sequential storage in the way of write storage medium；In data readback
When, by parsing data type, channel number, data length, serial number, bag mark, data compression scheme, data compression rate and adopting
Sample rate, UTC time, Beijing time and lapse of time, the synchronized playback of data is completed by information above.
2. multi-channel synchronous according to claim 1 store back method, it is characterised in that：The data packet head totally 20
Byte, wherein initial bag mark is fixed as " 0xEB, 0x90,0xEB, 0x90 ", totally 4 bytes；Data type is 2 bytes, point
Audio, video or Data-Link data Yong Yu not identified；Channel number is 2 bytes, for distinguishing different data channel；Packet length
Totally 4 bytes, the length for identifying whole packet；Data length is 4 bytes, for identifying effective data length,
Packet sequence number is 1 byte, the order for identifying bag；Packet is masked as 1 byte, for identifying current bag for starting is wrapped
Or subsequent packet, packet header verifies and is 2 bytes.
3. multi-channel synchronous according to claim 1 store back method, it is characterised in that：The data inclusion totally 2028
Individual byte, wherein data compression scheme totally 2 bytes, are which kind of mode to carry out data compression using for identifying；Data compression
Rate and sample rate totally 2 bytes, for the compression ratio or sample rate of mark data；UTC time totally 8 bytes, for identifying lattice
The Lin Nizhi times；Beijing time totally 8 bytes, for identifying cockpit video-with-audio recording device local zone time；Lapse of time, totally 6
Since byte, calculate starting record, identifies difference of this bag data relative to UTC time；Faulty word totally 4 bytes, are used for
Data analytic expression analyzes cockpit video-with-audio recording device current state；Library name totally 8 bytes are configured, for indicating products configuration shape
State, completes loading when the information is debugged according to different aircrafts in factory；Production code member totally 8 bytes, for indicating product mark
Number, the information completes loading, aspect or the Product Status that dispatch from the factory when being debugged in factory according to the different numberings of product；Aircraft number
Totally 14 bytes, for recognizing aircraft number, the information is inserted by outfield ground service attendant；Pilot numbers totally 2 bytes,
For recognizing that aircraft person numbers, the information is inserted by outfield ground service attendant；Valid data totally 1964 bytes；Inclusion is verified
Totally 2 bytes.
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| CN201611051067.3A CN106791534B (en) | 2016-11-24 | 2016-11-24 | Multichannel synchronous storage and playback method of cockpit audio and video recorder |
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| CN201611051067.3A CN106791534B (en) | 2016-11-24 | 2016-11-24 | Multichannel synchronous storage and playback method of cockpit audio and video recorder |
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| CN106791534A true CN106791534A (en) | 2017-05-31 |
| CN106791534B CN106791534B (en) | 2020-09-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895391A (en) * | 2017-08-30 | 2018-04-10 | 陕西千山航空电子有限责任公司 | A kind of flight data packet processing method |
| CN109300359A (en) * | 2018-12-03 | 2019-02-01 | 江西洪都航空工业集团有限责任公司 | A method of realizing Aircraft Simulator data readback |
| CN112667676A (en) * | 2020-11-04 | 2021-04-16 | 中国人民解放军海军航空大学青岛校区 | Flight parameter data packet packing method based on time scale |
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