CN106791534B - Multichannel synchronous storage and playback method of cockpit audio and video recorder - Google Patents
Multichannel synchronous storage and playback method of cockpit audio and video recorder Download PDFInfo
- Publication number
- CN106791534B CN106791534B CN201611051067.3A CN201611051067A CN106791534B CN 106791534 B CN106791534 B CN 106791534B CN 201611051067 A CN201611051067 A CN 201611051067A CN 106791534 B CN106791534 B CN 106791534B
- Authority
- CN
- China
- Prior art keywords
- data
- bytes
- packet
- data packet
- total
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
The invention belongs to the technical field of avionics, and particularly relates to a multichannel synchronous storage and playback method of a cockpit audio and video recorder. In order to ensure the accuracy and reliability of accident investigation, audio information recorded by an audio and video recorder of the cockpit at the same time must be synchronously played back with video information. The data storage is carried out in a data packet mode during storage, the structure of the data packet comprises a data packet header and a data packet body, the data packet header and the data packet body are combined into a whole, and then are written into a storage medium in a sequential storage mode after being sorted according to packet sequence numbers in the data packet header; and when the data is played back, the synchronous playback of the data is completed by analyzing the information. The method can effectively solve the problems of multi-channel audio, video and data link data, and can conveniently provide the correlation of the related audio, video and data link data during daily maintenance and accident investigation.
Description
Technical Field
The invention belongs to the technical field of avionics, and particularly relates to a multichannel synchronous storage and playback method of a cockpit audio and video recorder.
Background
The cockpit audio and video recorder can provide key information such as various environmental sounds of a cockpit and speech communication among crew members, cockpit environmental information, non-speech communication of the crew members, work of the crew members, instrument display selection and states and the like for accident investigators. In order to ensure the accuracy and reliability of accident investigation and the accurate relevance of audio data and video data at the same time, the audio information and the video information recorded by the audio and video recorder of the cockpit at the same time must be synchronously played back.
Disclosure of Invention
The invention provides an audio and video synchronous storage and playback method which is used for keeping synchronization of multichannel data collected and recorded by a cockpit audio and video recorder.
The multichannel synchronous storage playback method of the cockpit audio and video recorder comprises the steps that data are stored according to a data packet mode during storage, the structure of the data packet comprises a data packet header and a data packet body, wherein the data packet header comprises a starting packet mark, a data type, a channel number, a packet length, a data length, a packet sequence number, a data packet mark and a packet header checksum, and the data packet body comprises a data compression mode, a data compression rate and a sampling rate, UTC time, Beijing time, elapsed time, fault words, a configuration library name, a product number, an airplane number, a pilot number, effective data and a packet header checksum; the data packet header and the data packet body are combined into a whole, and then are written into a storage medium in a sequential storage mode after being sorted according to the packet sequence number in the data packet header; and during data playback, the synchronous playback of the data is completed through analyzing the data type, the channel number, the data length, the sequence number, the packet mark, the data compression mode, the data compression rate and sampling rate, the UTC time, the Beijing time and the elapsed time.
Further, the data packet header has 20 bytes, wherein the start packet flag is fixed to "0 xEB, 0x90, 0xEB, 0x 90" for 4 bytes; the data type is 2 bytes and is respectively used for identifying audio, video or data chain data; the channel number is 2 bytes and is used for distinguishing different data channels; the packet length is 4 bytes in total and is used for identifying the length of the whole data packet; the data length is 4 bytes and is used for identifying the effective data length, and the packet sequence number is 1 byte and is used for identifying the sequence of the packet; the data packet mark is 1 byte, which is used to mark the current packet as the initial packet or the subsequent packet, and the packet header checksum is 2 bytes.
Furthermore, the data enclosure has 2028 bytes, wherein the data compression mode has 2 bytes, and is used for identifying which mode is used for data compression; the data compression rate and the sampling rate are 2 bytes in total and are used for identifying the compression rate or the sampling rate of the data; the UTC time is 8 bytes in total and is used for identifying Greenwich mean time; the Beijing time is totally 8 bytes and is used for marking the local time of the audio and video recorder of the cockpit; elapsed time, 6 bytes total, calculated from the start of the recording, identifying the difference in this packet data relative to UTC time; the fault words are 4 bytes in total and used for analyzing the current state of the cabin audio and video recorder in a data analysis mode; the configuration library name is 8 bytes in total and is used for marking the configuration state of the product, and the information is loaded when debugging in a factory according to different airplanes; the product number is 8 bytes in total and is used for marking the product number, and the information is loaded when debugging in a factory according to different numbers of the product, and is in an aspect or factory product state; the number of the airplane is 14 bytes in total and is used for identifying the number of the airplane, and the information is put in by field ground service maintenance personnel; the pilot number is 2 bytes in total and is used for identifying the number of the aircraft crew, and the information is put in by field service maintenance personnel; valid data is 1964 bytes; the body checksum is 2 bytes in total.
Has the advantages that: the invention can effectively solve the problem of synchronous playback of multi-channel audio data, video data and data link data. The following beneficial effects can be brought in:
a) the method can effectively solve the problems of multi-channel audio, video and data link data, and can conveniently provide the correlation of the related audio, video and data link data during daily maintenance and accident investigation;
b) the data in the data storage mode of the invention not only contains Beijing time, but also contains UTC time, thereby being capable of conveniently obtaining the correlation between the two times and being convenient for keeping time synchronization with other equipment on the airplane.
Drawings
FIG. 1 is a schematic diagram of the packet composition of the present invention;
FIG. 2 is a schematic diagram of the composition of a data packet header according to the present invention;
FIG. 3 is a schematic diagram of the composition of a data enclosure according to the present invention;
FIG. 4 is a schematic diagram of a data storage format according to the present invention (taking video data as an example);
fig. 5 is a schematic diagram of the inventive data synchronous playback decoding.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, referring to fig. 1 to 5, and tables 1 to 2. A multichannel audio and video data synchronous storage method for a cabin audio and video recorder aims to ensure different data types, data among different data channels can be kept synchronous during data playback, and data storage is carried out according to a data packet mode during data storage.
As shown in fig. 1, a data packet in a multichannel audio/video data synchronous storage method for a cabin audio/video recorder includes a data packet header and a data packet body.
As shown in fig. 2, a data packet header in the multichannel audio/video data synchronous storage method of the cockpit audio/video recorder includes 20 bytes including a packet flag, a data type, a channel number, a packet length, a data length, a packet sequence number, a data packet flag, and a packet header checksum, where the packet flag is fixed to "0 xEB 0x 900 xEB 0x 90", and 4 bytes in total; the data type is 2 bytes and is respectively used for identifying audio, video and data chain data; the channel number is 2 bytes and is used for distinguishing different data channels; the packet length is 4 bytes in total and is used for identifying the length of the whole data packet; the data length is 4 bytes and is used for identifying the effective data length, the sequence number of the packet is 1 byte, and the sequence of the packet is identified; the data packet mark is 1 byte, which is used to mark the current packet as the initial packet or the subsequent packet, and the packet header checksum is 2 bytes.
As shown in fig. 3, a data inclusion in the multichannel audio/video data synchronous storage method for the cockpit audio/video recorder includes 2028 bytes in total, including data compression mode, data compression rate and sampling rate, UTC time, beijing time, elapsed time, fault word, configuration library name, product number, airplane number, pilot number, valid data, and inclusion checksum. The data compression mode has 2 bytes in total and is used for identifying which mode is adopted for data compression; the data compression rate and the sampling rate are 2 bytes in total and are used for identifying the compression rate or the sampling rate of the data; the UTC time is 8 bytes in total and is used for identifying Greenwich mean time; the Beijing time is totally 8 bytes and is used for marking the local time of the audio and video recorder of the cockpit; elapsed time, 6 bytes total, calculated from the start of the recording, identifying the difference in this packet data relative to UTC time; the fault words are 4 bytes in total and used for analyzing the current state of the cabin audio and video recorder in a data analysis mode; the configuration library name is 8 bytes in total and is used for marking the configuration state of the product, and the information is loaded when debugging in a factory according to different airplanes; the product number is 8 bytes in total and is used for marking the product number, and the information is loaded when debugging in a factory according to different numbers of the product, and is in an aspect or factory product state; the number of the airplane is 14 bytes in total and is used for identifying the number of the airplane, and the information is put in by field ground service maintenance personnel; the pilot number is 2 bytes in total and is used for identifying the number of the aircraft crew, and the information is put in by field service maintenance personnel; valid data is 1964 bytes; the body checksum is 2 bytes in total.
As shown in fig. 4, in a multichannel audio/video data synchronous storage method for a cabin audio/video recorder, 2048 bytes are combined into a whole, and then written into a storage medium in a sequential storage manner after being sorted according to a packet sequence number in a packet header;
as shown in fig. 5, in the multichannel audio/video data synchronous storage method for the cockpit audio/video recorder, when data is played back, data synchronization is completed through analyzing data types, data channels, data lengths, sequence numbers, packet flags, data compression modes, data compression rates and sampling rates, UTC time, beijing time and elapsed time.
Table 1 data packet header structure table
Table 2 data packet composition schematic
Claims (2)
1. A multichannel synchronous storage playback method of a cockpit audio and video recorder is characterized in that: the data storage is carried out in a data packet mode during storage, the structure of the data packet comprises a data packet header and a data packet body, wherein the data packet header comprises a starting packet mark, a data type, a channel number, a packet length, a data length, a packet sequence number, a data packet mark and a packet header checksum, and the data packet body comprises a data compression mode, a data compression rate and a sampling rate, UTC time, Beijing time, elapsed time, fault words, a configuration library name, a product number, an airplane number, a pilot number, effective data and a packet body checksum; the data packet header and the data packet body are combined into a whole, and then are written into a storage medium in a sequential storage mode after being sorted according to the packet sequence number in the data packet header; when data is played back, the data is synchronously played back through analyzing the data type, the channel number, the data length, the packet sequence number, the data packet mark, the data compression mode, the data compression rate and the sampling rate, the UTC time, the Beijing time and the elapsed time; the data packet header has 20 bytes, wherein the initial packet flag is fixed to '0 xEB, 0x90, 0xEB, 0x 90' and has 4 bytes; the data type is 2 bytes and is respectively used for identifying audio, video or data chain data; the channel number is 2 bytes and is used for distinguishing different data channels; the packet length is 4 bytes in total and is used for identifying the length of the whole data packet; the data length is 4 bytes and is used for identifying the effective data length, and the packet sequence number is 1 byte and is used for identifying the sequence of the packet; the data packet mark is 1 byte, which is used to mark the current packet as the initial packet or the subsequent packet, and the packet header checksum is 2 bytes.
2. The multi-channel synchronous storage playback method of claim 1, wherein: the data packet body has 2028 bytes, wherein the data compression mode has 2 bytes, and the data compression mode is used for identifying the mode for data compression; the data compression rate and the sampling rate are 2 bytes in total and are used for identifying the compression rate or the sampling rate of the data; the UTC time is 8 bytes in total and is used for identifying Greenwich mean time; the Beijing time is totally 8 bytes and is used for marking the local time of the audio and video recorder of the cockpit; elapsed time, 6 bytes total, calculated from the start of the recording, identifying the difference in this packet data relative to UTC time; the fault words are 4 bytes in total and used for analyzing the current state of the cabin audio and video recorder in a data analysis mode; the configuration library name is 8 bytes in total and is used for marking the configuration state of the product, and the information is loaded when debugging in a factory according to different airplanes; the product number is 8 bytes in total and is used for marking the product number, and the information is loaded when debugging in a factory according to different numbers of the product; the number of the airplane is 14 bytes in total and is used for identifying the number of the airplane, and the information is put in by field ground service maintenance personnel; the pilot number is 2 bytes in total and is used for identifying the number of the aircraft crew, and the information is put in by field service maintenance personnel; valid data is 1964 bytes; the body checksum is 2 bytes in total.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051067.3A CN106791534B (en) | 2016-11-24 | 2016-11-24 | Multichannel synchronous storage and playback method of cockpit audio and video recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051067.3A CN106791534B (en) | 2016-11-24 | 2016-11-24 | Multichannel synchronous storage and playback method of cockpit audio and video recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106791534A CN106791534A (en) | 2017-05-31 |
| CN106791534B true CN106791534B (en) | 2020-09-22 |
Family
ID=58910625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611051067.3A Active CN106791534B (en) | 2016-11-24 | 2016-11-24 | Multichannel synchronous storage and playback method of cockpit audio and video recorder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106791534B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895391B (en) * | 2017-08-30 | 2021-07-16 | 陕西千山航空电子有限责任公司 | Flight parameter 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 |
| CN112667676B (en) * | 2020-11-04 | 2022-08-30 | 中国人民解放军海军航空大学青岛校区 | Flight parameter data packing method based on time scale |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093617A (en) * | 2006-06-23 | 2007-12-26 | 莱斯莉·杰·莱内尔 | Safety landing apparatus |
| CN103648010A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | Synchronous flight data and multi-channel video and audio data playback method |
| CN103765369A (en) * | 2011-07-06 | 2014-04-30 | L-3通信公司 | Systems and methods for synchronizing various types of data on a single packet |
| CN104183032A (en) * | 2014-07-25 | 2014-12-03 | 陕西千山航空电子有限责任公司 | Cockpit audio caching recorder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8811616B2 (en) * | 2010-04-12 | 2014-08-19 | Flight Focus Pte. Ltd. | Secure aircraft data channel communication for aircraft operations |
-
2016
- 2016-11-24 CN CN201611051067.3A patent/CN106791534B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093617A (en) * | 2006-06-23 | 2007-12-26 | 莱斯莉·杰·莱内尔 | Safety landing apparatus |
| CN103765369A (en) * | 2011-07-06 | 2014-04-30 | L-3通信公司 | Systems and methods for synchronizing various types of data on a single packet |
| CN103648010A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | Synchronous flight data and multi-channel video and audio data playback method |
| CN104183032A (en) * | 2014-07-25 | 2014-12-03 | 陕西千山航空电子有限责任公司 | Cockpit audio caching recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106791534A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106791534B (en) | Multichannel synchronous storage and playback method of cockpit audio and video recorder | |
| RU2468439C2 (en) | Method and device for collection, recording and using of data taken in aircraft | |
| CN103489334B (en) | For the equipment in aviation field subsidiary communications | |
| US7516407B2 (en) | Timeline random access for multi-format time-based file recording and playback | |
| CN110035330A (en) | Video generation method, system, equipment and storage medium based on online education | |
| US20100260482A1 (en) | Generating a Synchronized Audio-Textual Description of a Video Recording Event | |
| BRPI0516159A (en) | cost reduction system and method for recording video data | |
| EP3214612A1 (en) | Flight training support system, mobile terminal, and flight training support program | |
| CN107895391B (en) | Flight parameter data packet processing method | |
| CN101290687B (en) | Method for rapidly obtaining cockpit voice recording | |
| CN108088488A (en) | A kind of target range telemetry joining method | |
| CN102238393A (en) | Method and device for resynchronizing audio code streams | |
| CN109450451A (en) | A kind of seamless spliced compression processing method and device of wave shape playback | |
| CN108966000A (en) | Playback method and its device, medium, terminal | |
| ES2936782T3 (en) | Digital record and replay system for an aircraft and method for reproducing instrumentation on board an aircraft | |
| CN115148209A (en) | Automatic report generation method and system based on cockpit voice recognition | |
| CN106603951A (en) | Airborne video data recording equipment | |
| CN103661970B (en) | The method that quick obtaining cockpit voice recording instrument and cockpit voice recording obtain | |
| CN114059997A (en) | Seismic while drilling multi-channel continuous acquisition system and data storage and data processing method | |
| CN109062989A (en) | A kind of vehicle-mounted monitoring date storage method | |
| CN202841362U (en) | Class teaching data recorder system | |
| CN100508057C (en) | Audio playing device and audio playing method | |
| CN114168535A (en) | Data processing and accessing method based on index cache | |
| KR100513038B1 (en) | Storing Method of Audible Data in Enhanced Multi-Channel Automatic Speech Recognition System | |
| CN103905743A (en) | Phonotape and videotape recording and broadcasting method for automatic and real-time Chinese subtitles labeling with Chinese language |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |