CN110166724A - A kind of multi-medium data sending method and device based on coaxial cable - Google Patents
A kind of multi-medium data sending method and device based on coaxial cable Download PDFInfo
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- CN110166724A CN110166724A CN201910440936.9A CN201910440936A CN110166724A CN 110166724 A CN110166724 A CN 110166724A CN 201910440936 A CN201910440936 A CN 201910440936A CN 110166724 A CN110166724 A CN 110166724A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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Abstract
The multi-medium data sending method based on coaxial cable that the invention discloses a kind of, including the following steps: receive multimedia data stream；Multimedia data stream is subjected to Data Format Transform, obtains the first data flow；The first data packet in first data flow is orderly used to cyclic redundancy CRC to calculate, and CRC code is exported according to pre-defined rule；CRC code is inserted into the first data flow and forms the second data flow；According to preset agreement, base refers to TRS sequence when generation；TRS sequence is inserted into formation third data flow in the second data flow；Third data flow is mapped to the 4th data flow；The 4th data packet of each of 4th data flow is converted into 1 serial data.Sending device based on this method, comprising: data receiver and format conversion unit, CRC calculate and are inserted into unit, bit mapping unit and converting unit.Original video data stream and audio data are converted into serial data by the present invention, are sent HD video and audio data by coaxial cable, are thus greatly reduced cost.
Description
Technical field
The present invention relates to field of data transmission more particularly to a kind of multi-medium data sending method based on coaxial cable and
Device.
Background technique
Currently, as Chinese Video Surveillance market need to by the securities projects such as safe city construction and every profession and trade video monitoring
The stimulation and pulling for seeking the factors such as rapid growth, achieve unconventional fast development, and overall market scale expands rapidly.Simulation prison
Control system can no longer meet security protection demand since its image definition is not high.And use full digital monitoring system, will bring compared with
Big cloth cable cost shows particularly evident particularly with the transformation monitoring system such as old residential area and workshop.
The extensive use of video monitoring, digitlization demand is higher and higher, and the trend of substitution conventional analog systems is presented.Tradition
Monitoring system be by composite video signal (CVBS) carry out channel coding, through coaxial cable transmission.Due to brightness and color
Degree mixes, and inevitable light tone is gone here and there mutually when the decoding YC separation of receiving end, influences the clarity of image.And it simulates
System can only transmit standard definition signal, not be able to satisfy the demand of era development.Current popular total digitalization is using network
Camera passes through network cable transmission HD video and audio data.But for existing tradition monitoring environment, need to replace cable,
Increase cost.
Summary of the invention
It is an object of the invention to solve defect of the existing technology.
In order to achieve the above objectives, the invention discloses a kind of multi-medium data sending method and dress based on coaxial cable
It sets.
On the one hand, this method includes the following steps:
Receive multimedia data stream；Multimedia data stream is subjected to Data Format Transform, obtains the first data flow, the first number
It is made of according to stream the first data packet that multiple bit wides are L.
The first data packet in first data flow is orderly used to cyclic redundancy CRC to calculate, and according to pre-defined rule, output
CRC code, CRC code are made of the CRC data packet that multiple bit wides are L；CRC code is inserted into the first data flow, the second data are formed
Stream, the second data flow are made of the second data packet that multiple bit wides are L.
According to preset agreement, base refers to TRS sequence when generation, and TRS sequence is made of the TRS data packet that multiple bit wides are L；
TRS sequence is inserted into the second data flow, third data flow, the third data that third data flow is L by multiple bit wides are formed
Packet is constituted；Third data flow is mapped to the 4th data flow, the 4th data flow is made of the 4th data packet that multiple bit wides are W.
The 4th data packet of each of 4th data flow is converted into 1 serial data, to transmit by coaxial cable.
Wherein, L, W are positive integer.
In one example, according to data bit width required by pre-set CRC calculation formula, to each first data packet
The advanced wide extension of line position is used further to CRC calculating.
If the bit wide for the initial check code that CRC is calculated is not L, by initial check code carry out Data Transform and/
Or bit wide extension, the CRC code constituted with the CRC data packet obtained by bit wide for L.
In one example, when receiving multimedia data stream, the video data and/or sound for including in multimedia data stream are obtained
Frequency evidence.
Also obtain the line synchronising signal and field sync signal for including in multimedia data stream；When not wrapped in multimedia data stream
Containing line synchronising signal and when field sync signal, according to scheduled rule, customized line synchronising signal and field sync signal.
In one example, the first data packet that bit wide is L is by M digital video data, 1 line synchronising signal, the synchronous letter of 1 potential field
Number and A extension bits composition, wherein L=M+A+2, the first place that extension bits are located at the first data packet is set or last bit is set.
Wherein, M, A are positive integer.
In one example, when line synchronising signal indicates that the transmission of a line multimedia data stream starts, by this line multimedia
Multiple first data packets corresponding to data flow are orderly used to CRC calculating, indicate a line multimedia data stream in line synchronising signal
When the end of transmission, one group of CRC code being made of the CRC data packet that N number of bit wide is L is obtained.
Wherein, N is positive integer.
In one example, next system clock week of a line multimedia data stream end of transmission is indicated in line synchronising signal
In phase, it is inserted into CRC code into the first data flow, forms the second data flow.
In one example, further comprises the steps of: and add M sequence, that is, synchronization of being expert at for line synchronising signal and/or field sync signal
Signal and/or the rising edge and/or falling edge of field sync signal add preset M sequence.
When the line synchronising signal that failing edge has M sequence indicates a line multimedia data stream end of transmission, in its M sequence
After scheduled duration afterwards, it is inserted into CRC code into the first data flow, forms the second data flow.
In one example, further comprises the steps of: and the second data flow is stored using asynchronous FIFO.
In one example, in an effective time of the write signal of asynchronous FIFO, a write operation is executed, by the first number
Asynchronous FIFO is written according to the first data packet that N number of bit wide in stream is L.
After detecting that line synchronising signal indicates a line multimedia data stream end of transmission, extend the write signal of asynchronous FIFO
Effective time, to execute write operation twice；Wherein, first time write operation will be last 1 corresponding to the row multimedia data stream
Asynchronous FIFO is written to N number of first data packet, second of write operation is by corresponding to the row multimedia data stream last 1 to N number of
Asynchronous FIFO is written in CRC data packet.
In one example, read the second data flow from asynchronous FIFO, and when it is empty for reading asynchronous FIFO, one group of insertion or
Multiple groups TRS sequence.
In one example, TRS sequence, comprising:
Header data, TRS packet meter digital data and control information data.
When in multimedia data stream including audio data, TRS sequence, further includes: audio data, audio check bit data
With audio number of significant digit evidence.
Further include the following steps in one example:
4th data flow is subjected to scrambling processing.
The high fdrequency component of scrambling treated the 4th data flow is compensated.
On the other hand, which includes:
Data receiver and format conversion unit, for receiving multimedia data stream；Multimedia data stream is subjected to data lattice
Formula conversion, obtains the first data flow, and the first data flow is made of the first data packet that multiple bit wides are L.
CRC is calculated and insertion unit, by the first data packet in the first data flow to be orderly used to based on cyclic redundancy CRC
It calculates, and according to pre-defined rule, exports CRC code, CRC code is made of the CRC data packet that multiple bit wides are L；CRC code is inserted into first
In data flow, the second data flow is formed, the second data flow is made of the second data packet that multiple bit wides are L.
Bit mapping unit, for according to preset agreement, base refers to TRS sequence when generation, and TRS sequence is L by multiple bit wides
TRS data packet constitute；TRS sequence is inserted into the second data flow, forms third data flow, third data flow is by multiple positions
The third data packet that width is L is constituted；Third data flow is mapped to the 4th data flow, the 4th data flow is W's by multiple bit wides
4th data packet is constituted.
Converting unit, for the 4th data packet of each of the 4th data flow to be converted into 1 serial data.
In one example, further includes: asynchronous FIFO, for storing the second data flow.
In one example, further includes:
Scrambling unit, for the 4th data flow to be carried out scrambling processing.
Pre-emphasis unit is compensated for the high fdrequency component to the 4th data flow after scrambling code.
The present invention has the advantages that cloth cable again is not needed, in sending device in existing conventional monitoring systems
Original multi-medium data is converted into 1 Bits Serial data by portion.Multi-medium data is sent by coaxial cable, to drop significantly
Low cost.
Detailed description of the invention
In order to become apparent from the technical solution for illustrating the embodiment of the present invention, embodiment will be described below in it is required use it is attached
Figure is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this field
For those of ordinary skill, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of multi-medium data sending method flow chart based on coaxial cable；
Fig. 2 is a kind of multi-medium data sending device block diagram based on coaxial cable；
Fig. 3 (a) is the Data Transform timing diagram of the embodiment of the present invention one；
Fig. 3 (b) is the Data Transform timing diagram of the row field signal for having M sequence of the embodiment of the present invention；
Fig. 4 (a) is that the 4th data packet of the embodiment of the present invention one splices schematic diagram；
Fig. 4 (b) is that the 4th data packet of the embodiment of the present invention two splices schematic diagram；
Fig. 4 (c) is that the 4th data packet of the embodiment of the present invention three splices schematic diagram；
Fig. 5 (a) is third data packet storage format schematic diagram in the video asynchronous FIFO of the embodiment of the present invention one；
Fig. 5 (b) is third data packet storage format schematic diagram in the video asynchronous FIFO of the embodiment of the present invention two；
Fig. 5 (c) is third data packet storage format schematic diagram in the video asynchronous FIFO of the embodiment of the present invention three.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The multi-medium data sending method based on coaxial cable that the invention discloses a kind of, as shown in Figure 1.This method packet
It includes:
Step S110: multimedia data stream is received；Multimedia data stream is subjected to Data Format Transform, obtains the first data
Stream.
Wherein, the first data flow is made of the first data packet that multiple bit wides are L.
When receiving multimedia data stream, the video data and/or audio data for including in multimedia data stream is obtained.
Also obtain the line synchronising signal HSYNC and field sync signal VSYNC for including in multimedia data stream；When multimedia number
When according to not including line synchronising signal and field sync signal in stream, according to scheduled rule, customized line synchronising signal and field synchronization
Signal.
The first data packet that bit wide is L can be by M digital video data, 1 line synchronising signal, 1 potential field synchronization signal and A
Extension bits are constituted, wherein L=M+A+2, the first place that extension bits are located at the first data packet is set or last bit is set, and extension bits are for separating
Each first data packet.
Step S120: the first data packet in the first data flow is orderly used to cyclic redundancy CRC and is calculated, and according to predetermined
Rule exports CRC code；CRC code is inserted into the first data flow, the second data flow is formed.
Wherein, CRC code is made of the CRC data packet that multiple bit wides are L；Second data flow is by second that multiple bit wides are L
Data packet is constituted.
It is wide to each advanced line position of first data packet according to data bit width required by pre-set CRC calculation formula
Extension is used further to CRC calculating.
If the bit wide for the initial check code that CRC is calculated is not L, by initial check code carry out Data Transform and/
Or bit wide extension, the CRC code constituted with the CRC data packet obtained by bit wide for L.
It, will be corresponding to this line multimedia data stream when line synchronising signal indicates that the transmission of a line multimedia data stream starts
Multiple first data packets, be orderly used to CRC calculating, when line synchronising signal indicates a line multimedia data stream end of transmission,
Obtain one group of CRC code being made of the CRC data packet that N number of bit wide is L.
In next system clock cycle that line synchronising signal indicates a line multimedia data stream end of transmission, to first
It is inserted into CRC code in data flow, forms the second data flow.
Step S130: according to preset agreement, base refers to TRS sequence when generation；TRS sequence is inserted into the second data flow
In, form third data flow；Third data flow is mapped to the 4th data flow.
Wherein, TRS sequence is made of the TRS data packet that multiple bit wides are L；Third data flow is by that multiple bit wides are L
Three data packets are constituted；4th data flow is made of the 4th data packet that multiple bit wides are W.
TRS sequence, comprising: header data, TRS packet meter digital data and control information data.
When in multimedia data stream including audio data, TRS sequence, further includes: audio data, audio check bit data
With audio number of significant digit evidence.
Step S140: the 4th data packet of each of the 4th data flow is converted into 1 serial data.
In above-mentioned steps, L, W, M, A, N are positive integer.Wherein, M is depending on the digit of video data, as conventional
Video data is generally 10,12,16.A can be because that need to be set as 1 or other positive integers.N can be according in the first video flowing
Depending on the system work clock number occupied needed for middle insertion CRC code, or according to the asynchronous FIFO for storing the second video flowing
Depending on the effective time of write signal.General value can be 3, or 4.W is determining according to the transmission bandwidth of coaxial cable, such as
Common coaxial cable transimissible bandwidth 20bx74.25MHz=1.485G at present, then W=20.Certainly, also there is a transmission bandwidth
Small vision signal (clarity is low) such as 10bx74.25MHz=0.7425G, then W=10.
When executing step S110, when in the multimedia data stream of acquisition including line synchronising signal and field sync signal,
In order to enhance the robustness that row field is extracted in receiving end, M sequence can also be added for line synchronising signal and/or field sync signal, i.e.,
Preset M sequence is added in the rising edge and/or falling edge of line synchronising signal and/or field sync signal.
When the line synchronising signal that failing edge has M sequence indicates a line multimedia data stream end of transmission, in its M sequence
After scheduled duration afterwards, it is inserted into CRC code into the first data flow, forms the second data flow.
In the step s 120, further include the steps that storing the second data flow using asynchronous FIFO.It is inserted into the first data flow
Enter CRC code, the process for forming the second data flow is completed by the asynchronous FIFO.
In an effective time of the write signal of asynchronous FIFO, a write operation is executed, it will be N number of in the first data flow
Asynchronous FIFO is written in the first data packet that bit wide is L.
After detecting that line synchronising signal indicates a line multimedia data stream end of transmission, extend the write signal of asynchronous FIFO
Effective time, to execute write operation twice；Wherein, first time write operation will be last 1 corresponding to the row multimedia data stream
Asynchronous FIFO is written to N number of first data packet, second of write operation is by corresponding to the row multimedia data stream last 1 to N number of
Asynchronous FIFO is written in CRC data packet.
When executing step S130, TRS sequence can read into the second data flow from asynchronous FIFO, and asynchronous reading
When FIFO is empty, it is inserted into one or more groups of.
After step s 130, the 4th data flow can be carried out to scrambling processing, intersymbol interference and shake is reduced, conveniently connect
Receiving end extracts clock.The high fdrequency component of scrambling treated the 4th data flow is compensated again, it is effective to improve output noise
Than.
For implementation steps S110-S140, the invention discloses a kind of, and the multi-medium data based on coaxial cable sends dress
It sets, as shown in Figure 2.The device includes: data receiver and format conversion unit, CRC is calculated and insertion unit, bit mapping unit and
Converting unit.
Data receiver and format conversion unit, for receiving multimedia data stream；Multimedia data stream is subjected to data lattice
Formula conversion, obtains the first data flow, and the first data flow is made of the first data packet that multiple bit wides are L.
CRC is calculated and insertion unit, by the first data packet in the first data flow to be orderly used to based on cyclic redundancy CRC
It calculates, and according to pre-defined rule, exports CRC code, CRC code is made of the CRC data packet that multiple bit wides are L；CRC code is inserted into first
In data flow, the second data flow is formed, the second data flow is made of the second data packet that multiple bit wides are L.
Bit mapping unit, for according to preset agreement, base refers to TRS sequence when generation, and TRS sequence is L by multiple bit wides
TRS data packet constitute；TRS sequence is inserted into the second data flow, forms third data flow, third data flow is by multiple positions
The third data packet that width is L is constituted；Third data flow is mapped to the 4th data flow, the 4th data flow is W's by multiple bit wides
4th data packet is constituted.
Converting unit, for the 4th data packet of each of the 4th data flow to be converted into 1 serial data.
When carrying out data transmission using above-mentioned apparatus, device can also include: asynchronous FIFO, scrambling unit and preemphasis
Unit
Asynchronous FIFO, for storing the second data flow.
Scrambling unit, for the 4th data flow to be carried out scrambling processing.
Pre-emphasis unit is compensated for the high fdrequency component to the 4th data flow after scrambling code.
Wherein, asynchronous FIFO can also be as needed, selects video asynchronous FIFO and/or audio asynchronous FIFO；When simultaneously
There are when video data and audio data, the second data flow can be stored using video asynchronous FIFO, using audio asynchronous FIFO
Store audio data.
Below by specific embodiment, illustrate the specific steps of this method and corresponding intrument in practical applications.
Embodiment one
Step S110: multimedia data stream is received；Multimedia data stream is subjected to Data Format Transform, obtains the first data
Stream.
Wherein, when receiving multimedia data stream, 10 digital video data, 32 audios for including in multimedia data stream are obtained
Data, 1 line synchronising signal and 1 potential field synchronization signal.
10 digital video data, 1 line synchronising signal, 1 potential field synchronization signal and 1 extension bits, use 0 are supplied into extension bits,
13 the first data packets are formed, as shown in table 1, wherein Din [9:0] indicates 10 digital video data.After the extension bits are used for
When continuous progress packet combining/splicing, data break is carried out.Extension bits can according to need setting 1 or multidigit, can also make by oneself
The value of adopted extension bits.
| Bit12 | Bit11 | Bit10 | Bit9 | Bit8 | Bit7 | Bit6 | Bit5 | Bit4 | Bit3 | Bit2 | Bit1 | Bit0 |
| Din[9] | Din[8] | Din[7] | Din[6] | Din[5] | Din[4] | Din[3] | Din[2] | Din[1] | Din[0] | HSYNC | VSYNC | 0 |
1 13, table the first data packets
Step S120: the first data packet in the first data flow is orderly used to cyclic redundancy CRC and is calculated, and according to predetermined
Rule exports CRC code；CRC code is inserted into the first data flow, the second data flow is formed.
Wherein, the data bit width that setting CRC calculation formula requires is 10, and the first data packet is extended to 20.Such as by 13
Extension bits in first data packet of position, and in order to calculate the 7 of extension, it is arranged at the low level of 20 data packets, and mended with 0
Foot.Data format is as shown in table 2.
Table 2 is extended to 20 the first data packets
The specific method that CRC is calculated can use general technology in the art, be not specifically limited in this embodiment in the present invention.
In the present embodiment, using CRC multinomial EDC (x)=x18+x5+x4+ 1, respectively to the first number for being extended to 20
It is calculated according to high 10 and low 10 of packet, obtains initial check code.Initial check code includes high 18 CRC data packets
CRCM [17:0] and low 18 CRC data packet CRCL [17:0].
Since the data packet bit wide in the first data flow is 13, for the ease of the insertion of cyclic redundancy check, by initial school
It tests code and carries out bit wide extension and format conversion, make the bit wide phase of the bit wide of its data packet with the first data packet in the first data flow
Together, the CRC code for thus obtaining 39, including 3 13 CRC data packets, the method for bit wide extension and format conversion can basis
Actual demand setting.As a kind of better embodiment, the data structure of the CRC code after bit wide extension and/or format conversion is such as
Under:
13bx3:{{CRCL[11:0],1′b0},{CRCL[17:12],CRCM[5:0],1′b0},{CRCM[17:6],1′
b0}}
Wherein, 12 in first 13 CRC data packet be that CRC is calculated low 18 and 1 Bits Expanding position, second
A 13 CRC data packets be 6 in CRC be calculated low 18, be 18 high in 6 with 1 Bits Expanding position, third 13
Position CRC data packet is 12 and 1 Bits Expanding position in high 18 that CRC is calculated, and wherein extension bits are supplied by 0.
In the present embodiment, when line synchronising signal indicates that the transmission of a line multimedia data stream starts, by this line multimedia
Multiple first data packets corresponding to data flow are orderly used to CRC calculating, indicate a line multimedia data stream in line synchronising signal
When the end of transmission, one group of CRC code being made of the CRC data packet that 3 bit wides are 13 is obtained.
Meanwhile as shown in Fig. 3 (a), the next of a line multimedia data stream end of transmission is indicated in line synchronising signal HSYNC
In a system clock cycle, it is inserted into CRC code into the first data flow by video asynchronous FIFO, forms the second data flow.Specifically
Are as follows:
In an effective time of the write signal of video asynchronous FIFO, a write operation is executed, it will be in the first data flow
1~3 the first data packet be written asynchronous FIFO.
After detecting that line synchronising signal indicates a line multimedia data stream end of transmission, extend the write signal of asynchronous FIFO
Effective time, to execute write operation twice.Wherein, first time write operation is different by 1~3 the first data packet write-in of the end of line
FIFO is walked, asynchronous FIFO is written in corresponding 1~3 CRC data packet of the row by second of write operation.
For example, if the row of multimedia data stream a length of 999, i.e. 999 the first data packets of a behavior, end of line needs to be inserted into
3 CRC data packets.For the ease of the insertion of CRC data packet, it is different that the first data flow is pressed into 3 the first packet combining write-ins every time
Walk FIFO.Then, in an effective time of the write signal of video asynchronous FIFO, a write operation is executed, by the first data flow
In 3 bit wides be 13 the first data packet be written asynchronous FIFO.In the present embodiment, one of the write signal of video asynchronous FIFO
Effective time is a system clock cycle.After detecting that line synchronising signal indicates a line multimedia data stream end of transmission,
Extend the effective time of the write signal of video asynchronous FIFO to the two systems clock cycle, to execute write operation twice.Wherein,
Video asynchronous FIFO is written in last 3 the first data packets of the end of line by write operation, and second of write operation is corresponding by the row
3 CRC data packet write-once video asynchronous FIFOs.
If the row of multimedia data stream a length of 1000, i.e. 1000 the first data packets of a behavior.End of line is inserted into 3 CRC numbers
According to packet.Then when being inserted into CRC data packet, first time write operation writes 1 the first data packet of the end of line and 2 CRC data packets
Enter asynchronous FIFO, asynchronous FIFO is written in 1 CRC data packet of the end of line by second of write operation.
Step S130: according to preset agreement, base refers to TRS sequence when generation；TRS sequence is inserted into the second data flow
In, form third data flow；Third data flow is mapped to the 4th data flow.
Shi Ji transmits synchronization signal relevant to multimedia data stream, control signal etc. with reference to TRS sequence.This
In embodiment, when base refers to TRS sequence when generating, 32 audio datas are read from audio asynchronous FIFO and TRS number is written
According to packet, provide that one group of TRS sequence includes 6 13 TRS data packets by preset protocol in the present embodiment, as shown in table 3.
3 TRS sequence of table
Wherein, TRS_HEAD is 2 13 header datas, and TRS_INFO is 4 13 information datas.
Header data is distinguished for positioning TRS data packet, and with video data.
In information data, AUD_L is 16 data of L channel, and AUD_R is 16 data of right channel, PN_L/P_L Zuo Sheng
Track data parity check bit, PN_R/P_R are right data parity check bit, and AUD_VALID is audio data significance bit,
Ctrl_info is control information, and cnt is TRS packet meter digital.
TRS sequence is being read into the second data flow from asynchronous FIFO, and when it is empty for reading asynchronous FIFO, one group of insertion or
Multiple groups.As a kind of preferred embodiment, 4 groups can be once inserted into, (0 to 3) are marked with cnt, until video asynchronous FIFO is not
It is empty.Receiving end is when receiving at least 2 groups of correct TRS sequences according to cnt value is determining in this way, it is believed that finds correctly
TRS sequence.
The third data flow being made of 13 data packets is mapped to the 4th data flow being made of 20 data packets.
Wherein, first 20 data packet of low 7 formation of first 13 data packet and second 13 data packet, the
High 6 of two 13 data packets, low 1 of 13 data packets of third and the 4th 13 data packets form second 20
Data, the least-significant byte of high 12 and the 5th 13 data packets of the 4th 13 data packets form 20 data of third, successively
Analogize.As shown in Fig. 4 (a).One of ordinary skilled in the art should be known, and the method for the mapping is only a kind of preferable reality
Scheme is applied, when it is implemented, various other specific mapping methods can also be used.
Step S140: the 4th data packet of each of the 4th data flow is converted into 1 serial data.
Embodiment two
Step S110: multimedia data stream is received；Multimedia data stream is subjected to Data Format Transform, obtains the first data
Stream.
Wherein, when receiving multimedia data stream, 12 digital video data, 32 audios for including in multimedia data stream are obtained
Data, 1 line synchronising signal and 1 potential field synchronization signal.
12 digital video data, 1 line synchronising signal, 1 potential field synchronization signal and 1 extension bits, use 0 are supplied into extension bits,
15 the first data packets are formed, as shown in table 4, wherein Din [11:0] indicates 12 digital video data.After the extension bits are used for
When continuous progress packet combining/splicing, data break is carried out.Extension bits can according to need setting 1 or multidigit, can also make by oneself
The value of adopted extension bits.
4 15, table the first data packets
Step S120: the first data packet in the first data flow is orderly used to cyclic redundancy CRC and is calculated, and according to predetermined
Rule exports CRC code；CRC code is inserted into the first data flow, the second data flow is formed.
Wherein, the data bit width that setting CRC calculation formula requires is 10, and the first data packet is extended to 20.Such as by 15
Extension bits in first data packet of position, and in order to calculate the 5 of extension, it is arranged at the low level of 20 data packets, and mended with 0
Foot.Data format is as shown in table 5.
Table 5 is extended to 20 the first data packets
The specific method that CRC is calculated can use general technology in the art, be not specifically limited in this embodiment in the present invention.
In the present embodiment, using CRC multinomial EDC (x)=x18+x5+x4+ 1, respectively to the first number for being extended to 20
It is calculated according to high 10 and low 10 of packet, obtains initial check code.Initial check code includes high 18 CRC data packets
CRCM [17:0] and low 18 CRC data packet CRCL [17:0].
Since the data packet bit wide in the first data flow is 15, for the ease of the insertion of cyclic redundancy check, by initial school
It tests code and carries out bit wide extension and format conversion, make the bit wide phase of the bit wide of its data packet with the first data packet in the first data flow
Together, the CRC code for thus obtaining 45, including 3 15 CRC data packets, the method for bit wide extension and format conversion can basis
Actual demand setting.As a kind of better embodiment, the data structure of the CRC code after bit wide extension and/or format conversion is such as
Under:
15bx3:{{CRCL[11:0],3′b0},{CRCL[17:12],CRCM[5:0],3′b0},{CRCM[17:6],3′
b0}}
Wherein, 12 in first 15 CRC data packet be that CRC is calculated low 18 and 3 Bits Expanding positions, second
A 15 CRC data packets be 6 in CRC be calculated low 18, be 18 high in 6 with 3 Bits Expanding positions, third 15
Position CRC data packet is 12 and 3 Bits Expanding positions in high 18 that CRC is calculated, and wherein extension bits are supplied by 0.
In the present embodiment, when line synchronising signal indicates that the transmission of a line multimedia data stream starts, by this line multimedia
Multiple first data packets corresponding to data flow are orderly used to CRC calculating, indicate a line multimedia data stream in line synchronising signal
When the end of transmission, one group of CRC code being made of the CRC data packet that 3 bit wides are 15 is obtained.
Meanwhile as shown in Fig. 3 (a), the next of a line multimedia data stream end of transmission is indicated in line synchronising signal HSYNC
In a system clock cycle, it is inserted into CRC code into the first data flow by video asynchronous FIFO, forms the second data flow.Specifically
Are as follows:
In an effective time of the write signal of video asynchronous FIFO, a write operation is executed, it will be in the first data flow
1~3 the first data packet be written asynchronous FIFO.
After detecting that line synchronising signal indicates a line multimedia data stream end of transmission, extend the write signal of asynchronous FIFO
Effective time, to execute write operation twice.Wherein, first time write operation is different by 1~3 the first data packet write-in of the end of line
FIFO is walked, asynchronous FIFO is written in corresponding 1~3 CRC data packet of the row by second of write operation.
For example, if the row of multimedia data stream a length of 999, i.e. 999 the first data packets of a behavior, end of line needs to be inserted into
3 CRC data packets.For the ease of the insertion of CRC data packet, it is different that the first data flow is pressed into 3 the first packet combining write-ins every time
Walk FIFO.Then, in an effective time of the write signal of video asynchronous FIFO, a write operation is executed, by the first data flow
In 3 bit wides be 15 the first data packet be written asynchronous FIFO.In the present embodiment, one of the write signal of video asynchronous FIFO
Effective time is a system clock cycle.After detecting that line synchronising signal indicates a line multimedia data stream end of transmission,
Extend the effective time of the write signal of video asynchronous FIFO to the two systems clock cycle, to execute write operation twice.Wherein,
Video asynchronous FIFO is written in last 3 the first data packets of the end of line by write operation, and second of write operation is corresponding by the row
3 CRC data packet write-once video asynchronous FIFOs.
If the row of multimedia data stream a length of 1000, i.e. 1000 the first data packets of a behavior.End of line is inserted into 3 CRC numbers
According to packet.Then when being inserted into CRC data packet, first time write operation writes 1 the first data packet of the end of line and 2 CRC data packets
Enter asynchronous FIFO, asynchronous FIFO is written in 1 CRC data packet of the end of line by second of write operation.
Step S130: according to preset agreement, base refers to TRS sequence when generation；TRS sequence is inserted into the second data flow
In, form third data flow；Third data flow is mapped to the 4th data flow.
Shi Ji transmits synchronization signal relevant to multimedia data stream, control signal etc. with reference to TRS sequence.This
In embodiment, when base refers to TRS sequence when generating, 32 audio datas are read from audio asynchronous FIFO and TRS number is written
According to packet, provide that one group of TRS sequence includes 6 15 TRS data packets by preset protocol in the present embodiment, as shown in table 6.
6 TRS sequence of table
Wherein, TRS_HEAD is 2 15 header datas, and TRS_INFO is 4 15 information datas.
Header data is distinguished for positioning TRS data packet, and with video data.
In information data, AUD_L is 16 data of L channel, and AUD_R is 16 data of right channel, PN_L/P_L Zuo Sheng
Track data parity check bit, PN_R/P_R are right data parity check bit, and AUD_VALID is audio data significance bit,
Ctrl_info is control information, and cnt is TRS packet meter digital.
TRS sequence is being read into the second data flow from asynchronous FIFO, and when it is empty for reading asynchronous FIFO, one group of insertion or
Multiple groups.As a kind of preferred embodiment, 6 groups can be once inserted into, (0 to 5) are marked with cnt, until video asynchronous FIFO is not
It is empty.Receiving end is when receiving at least 3 groups of correct TRS sequences according to cnt value is determining in this way, it is believed that finds correctly
TRS sequence.
The third data flow being made of 15 data packets is mapped to the 4th data flow being made of 20 data packets.
Wherein, first 20 data packet of low 5 formation of first 15 data packet and second 15 data packet, the
High 10 of two 15 data packets, second 20 data of low 10 is formationed of 15 data packets of third, third are 15 a
High 5 of data packet and the 4th 15 data packets formation 20 data of third.As shown in Fig. 4 (b).In the art is common
Technical staff should be known, and the method for the mapping is only a kind of preferred embodiment, when it is implemented, can also use other
Various specific mapping methods.
Step S140: the 4th data packet of each of the 4th data flow is converted into 1 serial data.
Embodiment three
Step S110: multimedia data stream is received；Multimedia data stream is subjected to Data Format Transform, obtains the first data
Stream.
Wherein, when receiving multimedia data stream, 16 digital video data, 32 audios for including in multimedia data stream are obtained
Data, 1 line synchronising signal and 1 potential field synchronization signal.
16 digital video data, 1 line synchronising signal, 1 potential field synchronization signal and 1 extension bits, use 0 are supplied into extension bits,
19 the first data packets are formed, as shown in table 7, wherein Din [15:0] indicates 16 digital video data.After the extension bits are used for
When continuous progress packet combining/splicing, data break is carried out.Extension bits can according to need setting 1 or multidigit, can also make by oneself
The value of adopted extension bits.
7 19, table the first data packets
Step S120: the first data packet in the first data flow is orderly used to cyclic redundancy CRC and is calculated, and according to predetermined
Rule exports CRC code；CRC code is inserted into the first data flow, the second data flow is formed.
Wherein, the data bit width that setting CRC calculation formula requires is 10, and the first data packet is extended to 20.Such as by 19
Extension bits in first data packet of position, and in order to calculate the 1 of extension, it is arranged at the low level of 20 data packets, and mended with 0
Foot.Data format is as shown in table 8.
Table 8 is extended to 20 the first data packets
The specific method that CRC is calculated can use general technology in the art, be not specifically limited in this embodiment in the present invention.
In the present embodiment, using CRC multinomial EDC (x)=x18+x5+x4+ 1, respectively to the first number for being extended to 20
It is calculated according to high 10 and low 10 of packet, obtains initial check code.Initial check code includes high 18 CRC data packets
CRCM [17:0] and low 18 CRC data packet CRCL [17:0].
Since the data packet bit wide in the first data flow is 19, for the ease of the insertion of cyclic redundancy check, by initial school
It tests code and carries out bit wide extension and format conversion, make the bit wide phase of the bit wide of its data packet with the first data packet in the first data flow
Together, the CRC code for thus obtaining 57, including 3 19 CRC data packets, the method for bit wide extension and format conversion can basis
Actual demand setting.As a kind of better embodiment, the data structure of the CRC code after bit wide extension and/or format conversion is such as
Under:
19bx3:{{CRCL[11:0],7′b0},{CRCL[17:12],CRCM[5:0],7′b0},{CRCM[17:6],7′
b0}}
Wherein, 12 in first 19 CRC data packet be that CRC is calculated low 18 and 7 Bits Expanding positions, second
A 19 CRC data packets be 6 in CRC be calculated low 18, be 18 high in 6 with 7 Bits Expanding positions, third 19
Position CRC data packet is 12 and 7 Bits Expanding positions in high 18 that CRC is calculated, and wherein extension bits are supplied by 0.
In the present embodiment, when line synchronising signal indicates that the transmission of a line multimedia data stream starts, by this line multimedia
Multiple first data packets corresponding to data flow are orderly used to CRC calculating, indicate a line multimedia data stream in line synchronising signal
When the end of transmission, one group of CRC code being made of the CRC data packet that 3 bit wides are 19 is obtained.
Meanwhile as shown in Fig. 3 (a), the next of a line multimedia data stream end of transmission is indicated in line synchronising signal HSYNC
In a system clock cycle, it is inserted into CRC code into the first data flow by video asynchronous FIFO, forms the second data flow.Specifically
Are as follows:
In an effective time of the write signal of video asynchronous FIFO, a write operation is executed, it will be in the first data flow
1~3 the first data packet be written asynchronous FIFO.
After detecting that line synchronising signal indicates a line multimedia data stream end of transmission, extend the write signal of asynchronous FIFO
Effective time, to execute write operation twice.Wherein, first time write operation is different by 1~3 the first data packet write-in of the end of line
FIFO is walked, asynchronous FIFO is written in corresponding 1~3 CRC data packet of the row by second of write operation.
For example, if the row of multimedia data stream a length of 999, i.e. 999 the first data packets of a behavior, end of line needs to be inserted into
3 CRC data packets.For the ease of the insertion of CRC data packet, it is different that the first data flow is pressed into 3 the first packet combining write-ins every time
Walk FIFO.Then, in an effective time of the write signal of video asynchronous FIFO, a write operation is executed, by the first data flow
In 3 bit wides be 19 the first data packet be written asynchronous FIFO.In the present embodiment, one of the write signal of video asynchronous FIFO
Effective time is a system clock cycle.After detecting that line synchronising signal indicates a line multimedia data stream end of transmission,
Extend the effective time of the write signal of video asynchronous FIFO to the two systems clock cycle, to execute write operation twice.Wherein,
Video asynchronous FIFO is written in last 3 the first data packets of the end of line by write operation, and second of write operation is corresponding by the row
3 CRC data packet write-once video asynchronous FIFOs.
If the row of multimedia data stream a length of 1000, i.e. 1000 the first data packets of a behavior.End of line is inserted into 3 CRC numbers
According to packet.Then when being inserted into CRC data packet, first time write operation writes 1 the first data packet of the end of line and 2 CRC data packets
Enter asynchronous FIFO, asynchronous FIFO is written in 1 CRC data packet of the end of line by second of write operation.
Step S130: according to preset agreement, base refers to TRS sequence when generation；TRS sequence is inserted into the second data flow
In, form third data flow；Third data flow is mapped to the 4th data flow.
Shi Ji transmits synchronization signal relevant to multimedia data stream, control signal etc. with reference to TRS sequence.This
In embodiment, when base refers to TRS sequence when generating, 32 audio datas are read from audio asynchronous FIFO and TRS number is written
According to packet, provide that one group of TRS sequence includes 6 19 TRS data packets by preset protocol in the present embodiment, as shown in table 9.
9 TRS sequence of table
Wherein, TRS_HEAD is 2 19 header datas, and TRS_INFO is 4 19 information datas.
Header data is distinguished for positioning TRS data packet, and with video data.
In information data, AUD_L is 16 data of L channel, and AUD_R is 16 data of right channel, PN_L/P_L Zuo Sheng
Track data parity check bit, PN_R/P_R are right data parity check bit, and AUD_VALID is audio data significance bit,
Ctrl_info is control information, and cnt is TRS packet meter digital.
TRS sequence is being read into the second data flow from asynchronous FIFO, and when it is empty for reading asynchronous FIFO, one group of insertion or
Multiple groups.As a kind of preferred embodiment, 6 groups can be once inserted into, (0 to 5) are marked with cnt, until video asynchronous FIFO is not
It is empty.Receiving end is when receiving at least 3 groups of correct TRS sequences according to cnt value is determining in this way, it is believed that finds correctly
TRS sequence.
The third data flow being made of 19 data packets is mapped to the 4th data flow being made of 20 data packets.
Wherein, first 20 data packet of low 1 formation of first 19 data packet and second 19 data packet, the
Second 20 data of low 2 formation of 19 data packets of high 18 of two 19 data packets and third, third 19
20 data of low 3 formation third of high 17 of data packet and the 4th 19 data packets, and so on.Such as Fig. 4 (c) institute
Show.One of ordinary skilled in the art should be known, and the method for the mapping is only a kind of preferred embodiment, specific implementation
When, various other specific mapping methods can also be used.
Step S140: the 4th data packet of each of the 4th data flow is converted into 1 serial data.
Example IV
Step S110: multimedia data stream is received；Multimedia data stream is subjected to Data Format Transform, obtains the first data
Stream.
Wherein, when receiving multimedia data stream, the 16 digital video data for including in multimedia data stream and 32 sounds are obtained
Frequency evidence.
Line synchronising signal and field sync signal, customized 1 line synchronising signal and 1 potential field synchronization signal are not present at this time.
16 digital video data, 1 line synchronising signal, 1 potential field synchronization signal and 1 extension bits, use 0 are supplied into extension bits,
Form 19 the first data packets.
Subsequent step is with embodiment three, and details are not described herein again.
It can also carry out following steps for above-described embodiment one, two, three, four.
In order to enhance the robustness that row field is extracted in receiving end, reduce the interference that signal is subject in transmission.For line synchronising signal
M sequence is added with field sync signal, i.e., adds preset M in the rising edge and falling edge of line synchronising signal and field sync signal
Sequence.As a kind of preferred embodiment, preset M sequence is added in rising edge and/or failing edge and is referred to, by the letter after rising edge
Number 1 or failing edge after signal 0, be changed to the value of M sequence, such as 16 binary codes 0001101101011001.
It is directed to the line synchronising signal that failing edge has M sequence, indicates that a line multi-medium data is spread in line synchronising signal
At the end of defeated, the scheduled duration after its M sequence is inserted into CRC into the first data flow after 2,3 or 4 system clock cycles
Code forms the second data flow.As shown in Fig. 3 (b), HSYNC_map indicates the line synchronising signal for having M sequence；VSYNC_map table
Show have the field sync signal of M sequence；M sequence indicates M sequence.
In order to reduce intersymbol interference and shake, facilitate the Clock Extraction of receiving end.Use formula G (x)=x9+x4+ 1 pair
Four data flows carry out scrambling processing.
In order to obtain preferable signal waveform in receiving end, impairment signal is compensated, i.e., to scrambling code, treated
Four data flows carry out preemphasis processing.To reduce the signal intersymbol interference ISI of receiving end caused by the high frequency attenuation of coaxial cable.
In above-described embodiment one, two, three, four, it is 32X57b that size, which can be used, and work clock is the view of 74.25MHz
Frequency asynchronous FIFO.Wherein, in embodiment one, storage format of 13 third data flows in video asynchronous FIFO, such as Fig. 5
(a) shown in；In embodiment two, storage format of 15 third data flows in video asynchronous FIFO, as shown in Fig. 5 (b)；It is real
It applies in example three, storage format of 19 third data flows in video asynchronous FIFO, as shown in Fig. 5 (c)；Wherein shade lattice table
Show write-in data, data are not written for blank cell expression.
In above-described embodiment one, two, three, four, it is 8X32b that size, which can be used, and writing clock is 3.072MHz, reads clock
For the audio asynchronous FIFO of 74.25MHz.
A kind of multi-medium data sending device and method based on coaxial cable is provided in the present embodiment.In existing biography
In monitoring system of uniting, cloth cable again is not needed, inside sending device, original video data stream and audio data are converted
At 1 Bits Serial data.HD video and audio data are sent by coaxial cable, thus greatly reduces cost.
Above specific embodiment has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Illustrate, it should be understood that the above is only a specific embodiment of the invention, the protection model that is not intended to limit the present invention
It encloses, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (15)
1. a kind of multi-medium data sending method based on coaxial cable, characterized in that it comprises the following steps:
Receive multimedia data stream；The multimedia data stream is subjected to Data Format Transform, obtains the first data flow, described the
One data flow is made of the first data packet that multiple bit wides are L；
The first data packet in first data flow is orderly used to cyclic redundancy CRC to calculate, and according to pre-defined rule, output
CRC code, the CRC code are made of the CRC data packet that multiple bit wides are L；The CRC code is inserted into first data flow,
The second data flow is formed, second data flow is made of the second data packet that multiple bit wides are L；
According to preset agreement, base refers to TRS sequence when generation, and the TRS sequence is made of the TRS data packet that multiple bit wides are L；
The TRS sequence is inserted into the second data flow, third data flow is formed, the third data flow is L's by multiple bit wides
Third data packet is constituted；The third data flow is mapped to the 4th data flow, the 4th data flow is W's by multiple bit wides
4th data packet is constituted；
The 4th data packet of each of 4th data flow is converted into 1 serial data, to transmit by coaxial cable；
Wherein, L, W are positive integer.
2. the method according to claim 1, wherein the number according to required by pre-set CRC calculation formula
According to bit wide, extension wide to each advanced line position of first data packet is used further to CRC calculating；
If the bit wide for the initial check code that CRC is calculated is not L, initial check code is subjected to Data Transform and/or position
Width extension, the CRC code constituted with the CRC data packet obtained by bit wide for L.
3. the method according to claim 1, wherein obtaining the multimedia number when receiving multimedia data stream
According to the video data and/or audio data for including in stream；
Also obtain the line synchronising signal and field sync signal for including in the multimedia data stream；When in the multimedia data stream
Not comprising line synchronising signal and when field sync signal, according to scheduled rule, customized line synchronising signal and field sync signal.
4. according to the method described in claim 3, it is characterized in that, bit wide is the first data packet of L by M digital video data, 1
Line synchronising signal, 1 potential field synchronization signal and A extension bits are constituted, wherein L=M+A+2, extension bits are located at the first data packet
First place is set or last bit is set；
Wherein, M, A are positive integer.
5. according to the method described in claim 3, it is characterized in that, indicating a line multimedia data stream in the line synchronising signal
When transmission starts, by multiple first data packets corresponding to this line multimedia data stream, it is orderly used to CRC calculating, described
When line synchronising signal indicates a line multimedia data stream end of transmission, obtains one group and be made of the CRC data packet that N number of bit wide is L
CRC code；
Wherein, N is positive integer.
6. according to the method described in claim 3, it is characterized in that, indicating a line multimedia data stream in the line synchronising signal
In next system clock cycle of the end of transmission, it is inserted into CRC code into the first data flow, forms the second data flow.
7. according to the method described in claim 3, it is characterized in that, further comprising the steps of: as line synchronising signal and/or field synchronization letter
Number addition M sequence, i.e., add preset M sequence in the rising edge and/or falling edge of line synchronising signal and/or field sync signal
Column；
When the line synchronising signal that failing edge has M sequence indicates a line multimedia data stream end of transmission, after its M sequence
After scheduled duration, it is inserted into CRC code into the first data flow, forms the second data flow.
8. the method according to claim 1, wherein further comprising the steps of: using asynchronous FIFO storage described second
Data flow.
9. according to the method described in claim 8, an it is characterized in that, effective time of the write signal in the asynchronous FIFO
It is interior, a write operation is executed, asynchronous FIFO is written into the first data packet that N number of bit wide in the first data flow is L；
After detecting that line synchronising signal indicates a line multimedia data stream end of transmission, extend having for the write signal of asynchronous FIFO
Duration is imitated, to execute write operation twice；Wherein, first time write operation is by corresponding to the row multimedia data stream last 1 to N number of
Asynchronous FIFO is written in first data packet, and second of write operation is by corresponding to the row multimedia data stream last 1 to N number of CRC number
Asynchronous FIFO is written according to packet.
10. according to the method described in claim 8, it is characterized in that, read second data flow from the asynchronous FIFO, and
When it is empty for reading asynchronous FIFO, it is inserted into one or more groups of TRS sequences.
11. method as described in claim 1, which is characterized in that the TRS sequence, comprising:
Header data, TRS packet meter digital data and control information data；
When in the multimedia data stream including audio data, the TRS sequence, further includes: audio data, audio check bit
Data and audio number of significant digit evidence.
12. method as described in claim 1, which is characterized in that further include the following steps:
4th data flow is subjected to scrambling processing；
The high fdrequency component of scrambling treated the 4th data flow is compensated.
13. a kind of multi-medium data sending device based on coaxial cable characterized by comprising
Data receiver and format conversion unit, for receiving multimedia data stream；The multimedia data stream is subjected to data lattice
Formula conversion, obtains the first data flow, and first data flow is made of the first data packet that multiple bit wides are L；
CRC is calculated and insertion unit, by the first data packet in first data flow to be orderly used to based on cyclic redundancy CRC
It calculates, and according to pre-defined rule, exports CRC code, the CRC code is made of the CRC data packet that multiple bit wides are L；By the CRC code
It is inserted into first data flow, forms the second data flow, the second data packet structure that second data flow is L by multiple bit wides
At；
Bit mapping unit, for according to preset agreement, base refers to TRS sequence when generation, and the TRS sequence is L by multiple bit wides
TRS data packet constitute；The TRS sequence is inserted into the second data flow, third data flow, the third data flow are formed
It is made of the third data packet that multiple bit wides are L；The third data flow is mapped to the 4th data flow, the 4th data flow
It is made of the 4th data packet that multiple bit wides are W；
Converting unit, for the 4th data packet of each of the 4th data flow to be converted into 1 serial data.
14. device according to claim 13, which is characterized in that further include:
Asynchronous FIFO, for storing the second data flow.
15. device according to claim 13, which is characterized in that further include:
Scrambling unit, for the 4th data flow to be carried out scrambling processing；
Pre-emphasis unit is compensated for the high fdrequency component to the 4th data flow after scrambling code.
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