CN204539301U - A kind of ANTENN AUDIO synchro system - Google Patents
A kind of ANTENN AUDIO synchro system Download PDFInfo
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- CN204539301U CN204539301U CN201520249291.8U CN201520249291U CN204539301U CN 204539301 U CN204539301 U CN 204539301U CN 201520249291 U CN201520249291 U CN 201520249291U CN 204539301 U CN204539301 U CN 204539301U
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Abstract
The utility model discloses a kind of ANTENN AUDIO synchro system, described ANTENN AUDIO synchro system, comprises synchronous transmitter and synchronous receiver.Synchronization accuracy of the present utility model improves significantly, improves the synchronization accuracy 1 number magnitude of current common testing methods: from 10 milliseconds of magnitudes to 1 millisecond of magnitude.Practical, the three-dimensional video analysis method generally applied at present domestic, software and hardware do not change substantially.Cost is low, and the audio synchronization system cost after volume production is low, and the expense improving/upgrade existing system is little.Be easy to promote the use of, owing to being directly for the solution of the problem design existing for current domestic on-the-spot test method, adding above-mentioned advantage, be suitable for promoting.
Description
Technical field
The utility model belongs to motion effects analysis field, particularly relates to a kind of ANTENN AUDIO synchro system.
Background technology
The research work that three-dimensional motion image analysing computer is widely used in sport biomechanics has already suffered.In actual measurement, need the two-dimensional coordinate measuring testee from the image of the video camera of two or more different visual angles, then use the method reconstruction of three-dimensional kinematic data of direct linear transformation (DLT), namely use DLT that the two-dimensional coordinate obtained from multiple cameras is converted to three-dimensional coordinate.In the measuring process of three-dimensional motion image, guarantee certainty of measurement, departure are very important.In reality test, two partially-workings are had to play a crucial role to raising precision, minimizing error, that is:
(1) time synchronized: the moving image of different shooting angles is synchronous in time;
(2) space is demarcated: obtain image and real space corresponding relation mathematically accurately;
By understanding the current synchronous method using multiple cameras to carry out three-dimensional video analysis both at home and abroad and sum up, be mainly divided into following methods:
(1) synchronous acquisition:
Synchronous acquisition is coupled together by the video camera with synchronizing function (as: industrial camera, dedicated video camera and some professional camera), based on a wherein video camera, remaining camera acquisition IMAQ of Synchronization Control, realize different cameras to gather between image synchronous, this synchronous method has very high synchronization accuracy (controlled in real time by system hardware, usual precision can reach musec order).
The video camera that usual synchronous acquisition is used in testing must be synchronous, not free poor to guarantee between the image that each video camera records, like this when using DLT that the two-dimensional coordinate obtained respectively in image captured by multiple cameras is converted to three dimensional space coordinate, avoid the measure error that the time difference causes.But having many difficulties at test site synchronization camera, is first need video camera to have synchronizing function, many long cables are then needed to connect video camera.But the common portable hand-held camera of a large amount of use at home does not at present possess synchronizing function, even if use the video camera of band synchronizing function, it is also unpractical for laying very long synchronous electric cable (sometimes even needing to pass through runway) in test site (being generally match or training scene).
(2) asynchronous collection:
Use and do not possess the common portable hand-held camera of synchronizing function, namely nonsynchronous cameras capture moving image is to carry out DLT three-dimensional motion analysis, does not need extra display and power supply at floor, very convenient, save time, laborsaving.But nonsynchronous image can bring nonsynchronous data in time, the method for some conventional at present minimizing time differences is: use synchronous or in recording a video the special event of extra light synchronous, although these methods are simple and convenient, synchronous precision is poor.
Example is below exactly that this seminar member analyzes by experiment, to calculate by different time synchronous error after the calculating of DLT, causes the research of three-dimensional motion resolution data error.By the measurement of throwing freely falling body and discus, the coordinate and the speed data that re-use the calculating of PEAK MOTUS MAS are discussed.First example is freely falling body, and the optical axis of video camera perpendicular to the direction of motion, and then is discussed as the example of reality by the data of discus.
Suppose speed difference that all video cameras are taken be very little, can ignore, thus the time difference between the image of video camera is constant.First record by the video image of three synchronization cameras, then the original two dimensional coordinate of one or two video camera be shifted in the time domain, advanced or delayed, with the time difference of the image in analog video camera.Then, after the 2-D data after displacement being calculated by DLT and Butterworth filter, obtain three-dimensional data, finally compare lapse data and original synchrodata, calculate synchronous error.
The result of study of freely falling body and throwing discus shows above, when the video camera that use three is not synchronous carries out three-dimensional video analysis and time difference between video camera is no more than 0.01 second, by the asynchronous error DX causing testee three-dimensional coordinate of image, DY and DZ is less than 0.1 meter, and DV/ V is about 10%.Although asynchronous family expenses hand-held camera can bring synchronous error, due to low price, easy to use, they are still widely used at present in three-dimensional video analysis.Research shows experimentally the prior measure error to being caused by asynchronous image to assess, and can be controlled by following method: (1) reduces the time error of optical axis perpendicular to the video camera of the direction of motion as far as possible; (2) the 3rd (multiple stage) video camera is used; (3) selection synchronous event controls the time difference between the image of video camera.The synchronous error that this part research of the present utility model causes when will carry out three-dimensional video analysis for using the asynchronous video camera of multiple stage exactly, develops the method and instrument and equipment that control and reduce this error further.
Most domestic is when competition and training collection in worksite is used for the video recording of 3 D analysis, what adopt is closest near picture approximation method in non-synchronous collection method, namely the original image that different cameras gathers in this way is not synchronous, but while IMAQ, use and adopt flash of light or other special events as the synchronizing signal of multiple cameras, be used for searching the picture closest to synchronous event in the video recording of different cameras.
Fig. 1 gives asynchronous video camera video frames and time relationship, here: T is video recording collection period (frequency=1/T), DT is individual picture acquisition time, Dt is synchronous error.The video frames Dt that using method (1) gathers is very little, substantially negligible, and it is asynchronous during the video frames that using method (3) gathers, can only to find according to the synchronous event in picture when image procossing in each video frames sequence closest to the picture that the moment occurs lock in time, make synchronous error Dt be less than image acquisition period.For the video camera that conventional, collection period are 20 milliseconds (frequency is 50 width/second), at this moment synchronous error can only be controlled within 20 milliseconds (about 10 milliseconds).
Another method of asynchronous acquisition method is the synchronous revised law of interpolation, namely the original image that different cameras gathers in this way is not synchronous, but while IMAQ, the medium beyond image is used to carry out accurate recording synchronizing information, then, when carrying out data processing, first the image of collection and the synchronizing information of record are placed at the same time in coordinate system, by the method for data interpolating, revise and improve the precision of time synchronized, reduce synchronous error.The synchronization accuracy of this method can reach millisecond or sub-millisecond magnitude.
But adopt which kind of media communication to carry out synchronously; Synchronizing information how is made to be combined with original image; How to guarantee that the synchronizing information device on each video camera sends synchronizing information signal simultaneously; How to obtain more accurate synchronized result; How by synchronizing information equipment miniaturization, facilitation; How to increase the quantity of synchronization camera, the place of Synchronous camera is limited in scope, stepped cost is high, be the difficult problem that this area exists always.
Utility model content
For the utility model that solves the problem provides a kind of ANTENN AUDIO synchro system.The synchronization accuracy 1 number magnitude of current common testing methods can be improved: from 10 milliseconds of magnitudes to 1 millisecond of magnitude; Device volume is little, easy to use; The scope of Synchronous camera is large, and the number of cameras that can be used for Synchronous camera is not limit.
For reaching above-mentioned technique effect, the technical solution of the utility model is:
A kind of ANTENN AUDIO synchro system, comprises synchronous transmitter and synchronous receiver,
Described synchronous transmitter inside is provided with the radio frequency generation module producing radiofrequency signal, and the radiofrequency signal that radio frequency generation module produces, through radiofrequency emitting module, is delivered to digital signal generation module radiofrequency signal being converted into digital signal; Digital signal is through the laminating module carrier modulation in synchronous transmitter with after amplifying, and formation transmits, and transmits to be sent to synchronous receiver through transmitting antenna; Described synchronous transmitter outside is provided with transmitter switch;
Described synchronous receiver outer setting has the reception antenna receiving and transmit; The received antenna that transmits reaches digital decode module through receiver module after receiving and amplifying; Transmit and undertaken being converted into audio signal after signal receiving and digital signal distinguish by digital decode module, audio signal, after audio frequency generation module carries out audio signal selection, reaches external MIC through audio signal output module.
Further improvement, described transmitter switch is two, is respectively low frequency switch and HF switch.When starting different switches, institute produces audio signal frequency difference.
Further improvement, described in the frequency that transmits be 315MHz, when low frequency switch starts, audio signal frequency is 1000Hz, and when HF switch starts, audio signal frequency is 2000Hz.
Further improvement, described synchronous transmitter and synchronous receiver are equipped with power supply.
Advantage of the present utility model:
(1) synchronization accuracy improves significantly.Improve the synchronization accuracy 1 number magnitude of current common testing methods: from 10 milliseconds of magnitudes to 1 millisecond of magnitude;
(2) practical.The three-dimensional video analysis method generally applied at present domestic, software and hardware do not change substantially;
(3) cost is low.Audio synchronization system cost after volume production is low, and the expense improving/upgrade existing system is little;
(4) be easy to promote the use of.Owing to being directly for the solution of the problem design existing for current domestic on-the-spot test method, adding above-mentioned advantage, be suitable for promoting.
Accompanying drawing explanation
The asynchronous video camera video frames of Fig. 1 and time relationship schematic diagram;
The structural representation of Fig. 2 embodiment 1;
The design principle schematic diagram of Fig. 3 ANTENN AUDIO synchro system;
The program circuit schematic diagram of Fig. 4 synchronous transmitter;
The program circuit schematic diagram of Fig. 5 synchronous receiver;
The in-site installation schematic diagram of Fig. 6 synchronous receiver;
Fig. 7 records a video the simple flow block diagram of synchronous process;
Fig. 8 audio synchronous signal schematic diagram;
The synchronous handling principle schematic diagram of Fig. 9.
Embodiment
A kind of ANTENN AUDIO synchro system as shown in Figure 2, comprises synchronous transmitter 1 and synchronous receiver 2,
Described synchronous transmitter 1 inside is provided with the radio frequency generation module 11 producing radiofrequency signal, and the radiofrequency signal that radio frequency generation module 11 produces, through radiofrequency emitting module 12, is delivered to the digital signal generation module 13 radiofrequency signal being converted into digital signal; Digital signal is through laminating module 14 carrier modulation in synchronous transmitter 1 with after amplifying, and formation transmits, and transmits to be sent to synchronous receiver 2 through transmitting antenna 15; Described synchronous transmitter 1 outside is provided with transmitter switch 16;
Described synchronous receiver 2 outer setting has the reception antenna 21 receiving and transmit; The received antenna 21 that transmits reaches digital decode module 23 through receiver module 22 after receiving and amplifying; Transmit and undertaken being converted into audio signal after signal receiving and digital signal distinguish by digital decode module 23, audio signal, after audio frequency generation module 24 carries out audio signal selection, reaches external MIC26 through audio signal output module 25.
Described transmitter switch 16 is two, is respectively low frequency switch 161 and HF switch 162; When starting different switches, institute produces audio signal frequency difference.The described frequency transmitted is 315MHz, and when low frequency switch 161 starts, audio signal frequency is 1000Hz, and when HF switch 162 starts, audio signal frequency is 2000Hz.Described synchronous transmitter 1 and synchronous receiver 2 are equipped with power supply.
The design principle of the ANTENN AUDIO synchro system of the present embodiment as shown in Figure 3; The program circuit of synchronous transmitter and synchronous receiver respectively as shown in Figure 4 and Figure 5.
The ANTENN AUDIO synchro system parameter that the present embodiment makes is as follows:
1. wireless synchronization signal precision: be better than 0.1 millisecond.
2. wireless synchronization scope: be not less than 200 meters.
3. synchronization camera quantity: do not limit.
4. radio carrier frequency frequency: 315MHz.
5. audio synchronous signal frequency: double frequency, 1KHz and 2KHz.
6. the live recording same period: integrated microphone.
7. wireless synchronization signal emitter dimensions: (12 centimetres) X(4 centimetre) X(1 centimetre).
8. wireless synchronization signal reflector weight: (10 grams).
9. wireless synchronization signal receiver size: (13 centimetres) X(7 centimetre) X(4.5 centimetre).
10. wireless synchronization signal receiver weight: (20 grams).
ANTENN AUDIO synchro system using method of the present utility model, comprises the steps:
Step one) apparatus installation: the video camera 3 preparing some band Mic input functions, after video camera 3 erection being installed, the synchronous receiver of external MIC26 is placed on the side of each video camera, as shown in Figure 6;
Step 2) synchronous point setting: open synchronous receiver 2 and video camera 3, needing to arrange synchronous time point of short duration unlatching synchronous transmitter transmitting shooting synchronizing signal 1; The time point of short duration unlatching synchronous transmitter terminated in shooting launches the 1 shooting end signal different from shooting synchronous signal frequency;
Step 3) device shutdown: shooting terminates rear closedown video camera 3 and ANTENN AUDIO synchro system;
Step 4) video recording input: the shooting of admission is inputted computer respectively, forms some audio-visual data files;
Step 5) image synchronization process: image is synchronously processed, comprises the steps: as shown in Figure 7
The synchronous process software of phonotape and videotape put into by audio-visual data file by 5-1., and the picture finding synchronizing signal to occur in each audio-visual data file deletes the picture before synchronizing signal occurs;
From the beginning each audio-visual data file aligns by 5-2., the broadcasting speed changing each audio-visual data file carries out image interpolation as data file to other audio-visual data file for reference note with one of them audio-visual data file, to find in the audio-visual data file by interpolation synchronizing signal position and reference note as data file identical or immediate picture; Delete the picture before described picture;
5-3. needs to determine the length of reference note as data file according to analysis, and cutting also removes the unwanted part of all audio-visual data tail of file, and the audio-visual data file after alignment cutting, then recovers the broadcasting speed of each audio-visual data file; According to shooting end signal cutting remove the unwanted part of all audio-visual data tail of file;
Step 6) file derivation: the audio-visual data file after cutting is derived respectively, namely obtains synchronous audio-visual data file.
Audio synchronization method principle described in the utility model as shown in Figure 8 and Figure 9, utilizes audio frequency (microphone input) function of video camera specifically, is recorded continuously by synchronous audio voltage signal, be used for revising synchronous error.If Fig. 8 is monophonic audio synchronizing signal schematic diagram, two time shafts represent respectively audio synchronous signal at two video cameras record position in audio track, their recording location in fact of box indicating, they are different apart from the position of recording starting point usually, so need translation synchronously to process.
Fig. 9 is synchronous handling principle schematic diagram, and wherein the inferior and superior halves of figure is respectively two video camera synchronous recordings, respective video and audio signal respectively.Wherein long filled black frame table shows the original image of camera acquisition, and can see due to asynchronous shooting, two camera audio synchronizing signals are different from the relative position of primitive frame.In order to reduce synchronous error, interpolation being carried out to the video recording of video camera 2, representing the frame of interpolation here with shorter colourless filling frame and point-like filling frame.Synchronous process is exactly moved in parallel by the picture frame of colourless filling frame consistent with video camera 1 to audio synchronous signal and the relative position of picture frame to align to the primitive frame of video camera 1, and the video clip after cutting out is exactly synchronous.
The explanation of above example just understands core concept of the present utility model for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (4)
1. an ANTENN AUDIO synchro system, comprises synchronous transmitter (1) and synchronous receiver (2), it is characterized in that,
Described synchronous transmitter (1) inside is provided with the radio frequency generation module (11) producing radiofrequency signal, the radiofrequency signal that radio frequency generation module (11) produces, through radiofrequency emitting module (12), is delivered to the digital signal generation module (13) radiofrequency signal being converted into digital signal; Digital signal is through laminating module (14) carrier modulation in synchronous transmitter (1) with after amplifying, and formation transmits, and transmits to be sent to synchronous receiver (2) through transmitting antenna (15); Described synchronous transmitter (1) outside is provided with transmitter switch (16);
Described synchronous receiver (2) outer setting has the reception antenna (21) receiving and transmit; The received antenna (21) that transmits reaches digital decode module (23) through receiver module (22) after receiving and amplifying; Transmit and undertaken being converted into audio signal after signal receiving and digital signal distinguish by digital decode module (23), audio signal, after audio frequency generation module (24) carries out audio signal selection, reaches external MIC(26 through audio signal output module (25)).
2. ANTENN AUDIO synchro system as claimed in claim 1, it is characterized in that, described transmitter switch (16) is two, is respectively low frequency switch (161) and HF switch (162).
3. ANTENN AUDIO synchro system as claimed in claim 2, is characterized in that, described in the frequency that transmits be 315MHz, when low frequency switch (161) starts, audio signal frequency is 1000Hz, and when HF switch (162) starts, audio signal frequency is 2000Hz.
4. ANTENN AUDIO synchro system as claimed in claim 1, it is characterized in that, described synchronous transmitter (1) and synchronous receiver (2) are equipped with power supply.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754271A (en) * | 2015-04-23 | 2015-07-01 | 国家体育总局体育科学研究所 | Wireless audio synchronization system and method |
| CN113497944A (en) * | 2020-03-19 | 2021-10-12 | 上海科技大学 | Multi-view three-dimensional live broadcast method, system, device, terminal and storage medium |
-
2015
- 2015-04-23 CN CN201520249291.8U patent/CN204539301U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754271A (en) * | 2015-04-23 | 2015-07-01 | 国家体育总局体育科学研究所 | Wireless audio synchronization system and method |
| CN104754271B (en) * | 2015-04-23 | 2017-07-04 | 国家体育总局体育科学研究所 | A kind of ANTENNAUDIO synchronization system and method |
| CN113497944A (en) * | 2020-03-19 | 2021-10-12 | 上海科技大学 | Multi-view three-dimensional live broadcast method, system, device, terminal and storage medium |
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