CN111385524B - Method and system for realizing high-speed long-distance data transmission of analog high-definition camera - Google Patents
Method and system for realizing high-speed long-distance data transmission of analog high-definition camera Download PDFInfo
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- CN111385524B CN111385524B CN201811615851.1A CN201811615851A CN111385524B CN 111385524 B CN111385524 B CN 111385524B CN 201811615851 A CN201811615851 A CN 201811615851A CN 111385524 B CN111385524 B CN 111385524B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Abstract
The invention discloses a method and a system for realizing high-speed long-distance data transmission of a simulation high-definition camera, wherein the method is applied to a data sending end and comprises the following steps: step S1, acquiring data collected by the camera, transmitting the data to a transmission layer and encapsulating the data into a transmission layer protocol; step S2, performing DC balance coding on the data at the data link layer; and step S3, DA converting each coded bit according to proper sampling frequency in the physical layer, and transmitting the converted signal to the data receiving end in the existing effective video transmission line.
Description
Technical Field
The invention relates to the technical field of signal transmission of a simulation high-definition camera, in particular to a method and a system for realizing high-speed long-distance data transmission of the simulation high-definition camera.
Background
Since the introduction of HDCVI (High Definition Composite Video Interface) analog High Definition standard (HDCVI) in 2012, analog High Definition technology mainly applied to security monitoring has achieved great technical progress and market share. The analog high-definition technology inherits the characteristics of simplicity and easiness in use of the traditional CVBS analog video technology, can use the existing cable equipment, simultaneously expands the bandwidth of analog signal transmission, improves the resolution ratio of transmitted video, and integrates signals such as alarm, coaxial video control and audio, so that the coaxial cable can transmit videos with various resolutions and also can perform bidirectional transmission of digital signals.
The transmission of digital signals carried by the current analog high-definition technology is to select and superimpose digital pulse signals in a specific blanking line. Moreover, the existing technical standard can only process digital pulse width signals with lower speed, and the common unit digital pulse width is about 1 us. In addition, in various analog high-definition video formats, the number of blanking lines is limited, and the bidirectional data transmission rate is also greatly limited, so that the bidirectional digital transmission rate is extremely limited.
With the application of the camera end becoming more and more abundant, the camera end is no longer limited to the acquisition and transmission of videos, and audio, various sensor signals and other functional signals are expected to be transmitted to the back-end equipment through coaxial cables, so that the front-end camera can be used as a carrier of various information, and the practical application capability of the camera is enriched. The original digital transmission technology of the analog high-definition standard cannot meet the increasing data transmission requirements, so a technical means needs to be provided to improve the capability of the analog high-definition camera to transmit data to the back-end equipment.
Disclosure of Invention
In order to overcome the defects in the prior art, the present invention provides a method and a system for implementing high-speed long-distance data transmission of an analog high-definition camera, so as to implement high-speed long-distance transmission of digital signals on a coaxial cable.
In order to achieve the above purpose, the present invention provides a method for implementing high-speed long-distance data transmission of an analog high-definition camera, which is applied to a data transmitting end, and comprises the following steps:
step S1, acquiring data collected by the camera, transmitting the data to a transmission layer and encapsulating the data into a transmission layer protocol;
step S2, performing DC balance coding on the data at the data link layer;
step S3, DA-converting each encoded bit according to a suitable sampling frequency in the physical layer, and carrying the converted signal in the existing effective video transmission line to transmit to the data receiving end.
Preferably, in step S1, after acquiring the video data, the high definition camera application layer processes the video data into a digital signal and transmits the digital signal to the transport layer, and the transport layer generates a check code for the digital signal by CRC check and encapsulates the check code into a transport layer protocol.
Preferably, in step S2, after dc-balanced encoding, a preamble sequence may be added to the front end of the data for positioning and synchronizing the data stream
In order to achieve the above object, the present invention further provides a method for implementing high-speed long-distance data transmission of an analog high-definition camera, which is applied to a data receiving end, and comprises the following steps:
step S1, performing AD sampling processing on the obtained video data;
step S2, the sampling points obtained by sampling the selected effective video line are grouped according to the sampling point number of each bit;
step S3, performing preamble positioning and DC balance decoding on each group of sampling point sequences, and performing CRC (cyclic redundancy check) check;
step S4, the correct packet data is checked by the CRC check, and the correct transmission data is resolved according to the transport layer protocol.
Preferably, in step S2, the obtained video signal is subjected to signal filtering before being packetized.
In order to achieve the above object, the present invention further provides a system for implementing high-speed long-distance data transmission of an analog high-definition camera, which is applied to a data transmitting end, and comprises the following steps:
the sending terminal application layer is used for acquiring data collected by the camera, packaging the data by using an application layer protocol and then transmitting the data to the sending terminal transmission layer;
the transmitting end transmission layer is used for generating a check code for the digital signal, packaging the check code into a transmission layer protocol and transmitting the check code to a transmitting end data link layer;
the transmitting end data link layer is used for carrying out direct current balance coding on data and then transmitting the data to the transmitting end physical layer;
and the sending end physical layer is used for carrying out DA conversion on each bit of the coded data according to a proper sampling frequency, and carrying the converted signal in the existing effective video transmission line to transmit to the data receiving end.
Preferably, the transmitting end transmission layer generates a check code for the digital signal by using CRC check, and encapsulates the check code into a transmission layer protocol and transmits the transmission layer protocol to the transmitting end data link layer.
Preferably, the data link layer of the transmitting end adds a preamble sequence to the data front end after the dc balanced coding, so as to position and synchronize the data stream.
In order to achieve the above object, the present invention further provides a system for implementing high-speed long-distance data transmission of an analog high-definition camera, which is applied to a data receiving end, and comprises:
the receiving end physical layer is used for carrying out AD sampling processing on the obtained video data and grouping sampling points obtained by sampling the selected effective video line according to the number of sampling points of each bit;
the receiving end data link layer performs preamble positioning and DC balance decoding on each group of sampling point sequences and transmits the decoded data to a receiving end transmission layer;
the receiving end transmission layer is used for carrying out CRC (cyclic redundancy check) on the received data, checking correct grouped data, solving correct transmission data according to a transmission layer protocol and transmitting the correct transmission data to the receiving end application layer;
and the application layer of the receiving end utilizes an application layer protocol to solve correct video data output.
Preferably, the receiving-end physical layer may further perform signal filtering on the obtained video signal before the grouping.
Compared with the prior art, the method and the system for realizing high-speed long-distance data transmission of the analog high-definition camera can improve the speed of digital signal transmission of an analog high-definition technology and have good long-distance transmission capability
Drawings
Fig. 1 is a flowchart illustrating steps of an embodiment of a method for implementing high-speed long-distance data transmission of a simulation high-definition camera according to the present invention;
FIG. 2 is a flowchart illustrating steps of a method for implementing high-speed long-distance data transmission of a high-definition camera according to another embodiment of the present invention;
fig. 3 is a system architecture diagram of an implementation system for simulating high-speed long-distance data transmission of a high-definition camera according to the present invention;
fig. 4 is a data transmission flow chart of a data transmission end in the embodiment of the present invention;
fig. 5 is a flow chart of data reception at a data receiving end according to an embodiment of the present invention.
Detailed Description
Other advantages and capabilities of the present invention will be readily apparent to those skilled in the art from the present disclosure by describing the embodiments of the present invention with specific embodiments thereof in conjunction with the accompanying drawings. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention.
Fig. 1 is a flowchart illustrating steps of an implementation method for simulating high-speed long-distance data transmission of a high-definition camera according to an embodiment of the present invention. As shown in fig. 1, the implementation method for simulating high-speed long-distance data transmission of a high-definition camera of the present invention is applied to a data transmitting end, and includes the following steps:
and step S1, acquiring the data collected by the camera, and transmitting the data to a transport layer to be packaged into a transport layer protocol. In an embodiment of the present invention, the video camera is a high-definition video camera, and specifically, after acquiring video data, the application layer of the high-definition video camera processes the video data into a digital signal and transmits the digital signal to the transport layer, and a Check code is generated on the digital signal by using Cyclic Redundancy Check (CRC) in the transport layer, and is encapsulated in a transport layer protocol. Specifically, CRC check generally uses a generator polynomial to perform modulo-2 division on an information polynomial to generate a check code, and since CRC check is performed by using the existing mature technology, it is not described herein again.
In step S2, DC (direct current) balanced encoding is performed on the data at the data link layer. Specifically, the dc balance coding is a data coding method for keeping the number of 1 s and 0 s in the data stream equal or a fixed difference, and the dc balance block transmission code data corresponding to the data segment is obtained by sampling the first original data and performing the dc balance coding on the data segment obtained by sampling. The clock can be embedded in the DC balance transmission code by adopting the DC balance code, so that the sampling and receiving are convenient, and the communication efficiency is improved. Specifically, the dc balance encoding table may be queried according to the obtained initial data to encode the data. Because the DC balance code can have a plurality of self-defined code tables, the DC balance code table can be preset or default. Preferably, in step S2, after DC encoding, a preamble sequence may be added to the data front end for positioning and synchronizing the data stream.
Step S3, DA (digital to analog) conversion is performed on each encoded bit (bi t) according to a suitable sampling frequency in the physical layer, and the converted signal is carried in the existing active video transmission line (usually the first active video transmission line) and transmitted to the data receiving end, where the active video line will not transmit video data but encoded digital signal.
Fig. 2 is a flowchart illustrating steps of a method for implementing high-speed long-distance data transmission of an analog high-definition camera according to another embodiment of the present invention. As shown in fig. 2, the implementation method for simulating high-speed long-distance data transmission of a high-definition camera of the present invention is applied to a data receiving end, and comprises the following steps:
in step S1, AD sampling processing is performed on the obtained video data. Specifically, after receiving the video signal from the data transmitting end, the data receiving end performs AD sampling processing according to the normal video. The AD sampling of the analog video signal is referred to herein, and a currently mature RX chip is used, which is not described herein again.
Step S2, the sampling points obtained by sampling the selected effective video line are grouped according to the number of sampling points of each bit (bit). The sampling point is the data of each line of video (i.e. the data of video is used by the invention to transmit the data signal to be transmitted by the invention) after the RX chip for AD sampling performs AD. The packet is processed according to the condition of the transmitting end DA, for example, 1 data at the transmitting end is identified by 5 sampling points, and the data is divided into 5 packets.
Preferably, for long-distance transmission, the obtained video signal may also need to be subjected to signal filtering before grouping, and certainly, for short-distance transmission, filtering may also not be performed, which is not described herein.
Step S3, perform preamble positioning, DC balance decoding, and CRC check on each group of sampling point sequences, where the preamble is used to position the coded data area, and the DC balance decoding and CRC check correspond to the processing of the sending end, and since the preamble positioning, DC balance decoding, and CRC check, etc. all use common methods, they are not described herein.
Step S4, the correct packet data is checked by the CRC check, and the correct transmission data is resolved according to the transport layer protocol. At this time, one or more effective video lines are used to transmit digital signals, and the rear-end receiving end only needs software to analyze the sampling data of the lines to obtain the transmitted digital signals.
Fig. 3 is a system architecture diagram of an implementation system for simulating high-speed long-distance data transmission of a high-definition camera according to the present invention. As shown in fig. 3, the system for implementing high-speed long-distance data transmission of an analog high-definition camera of the present invention is applied to a data transmitting end, and includes the following steps:
the sending terminal application layer 30 is used for acquiring data collected by the camera, packaging the data by using an application layer protocol and then transmitting the data to the transmission layer; after acquiring video data, the application layer 30 of the high-definition camera serving as a data sending end processes the video data into a digital signal, encapsulates the digital signal by using an application layer protocol, and then transmits the encapsulated digital signal to the sending end transmission layer 31;
the transmitting end transport layer 31 is configured to generate a Check code for the digital signal by using a Cyclic Redundancy Check (CRC), encapsulate the Check code into a transport layer protocol, and transmit the transport layer protocol to the transmitting end data link layer 32. In an embodiment of the present invention, the CRC check generates a check code by modulo-2 dividing the information polynomial using the generator polynomial.
And a transmitting end data link layer 32, configured to perform DC (direct current) balanced encoding on the data and transmit the data to a transmitting end physical layer 33. Specifically, the dc balance coding is a data coding method for keeping the number of 1 s and 0 s in the data stream equal or a fixed difference, and the dc balance block transmission code data corresponding to the data segment is obtained by sampling the first original data and performing the dc balance coding on the data segment obtained by sampling. The clock can be embedded in the DC balance transmission code by adopting the DC balance code, so that the sampling and receiving are convenient, and the communication efficiency is improved. Specifically, the dc balance encoding table may be queried according to the obtained initial data to encode the data. Because the DC balance code can have a plurality of self-defined code tables, the DC balance code table can be preset or default. Preferably, the sender-side data link layer 32 may also add a preamble sequence to the data front end after DC coding for positioning and synchronizing the data stream.
The sender physical layer 33 is configured to perform DA (digital to analog) conversion on each bit (bi t) of the encoded data according to a suitable sampling frequency, and carry the converted signal in an existing active video transmission line (usually the first active video transmission line) to transmit to the data receiving end, that is, the active video line will not transmit video data but an encoded digital signal.
As shown in fig. 3, the system for implementing high-speed long-distance data transmission of an analog high-definition camera according to the present invention is applied to a data receiving end, and includes:
and the receiving end physical layer 41 is configured to perform AD sampling processing on the obtained video data, and group sampling points obtained by sampling the selected effective video line according to the number of sampling points of each bit (bit). Specifically, after receiving the video signal of the transmitting end, the receiving end physical layer 41 of the receiving end performs AD sampling processing on the normal video, and performs grouping according to the number of sampling points of each bit.
A receiving end data link layer 42, which performs preamble positioning and DC balance decoding on each group of sampling point sequences, and transmits the decoded data to a receiving end transmission layer 43;
the receiving end transport layer 43 is used to perform CRC check on the received data, check the correct packet data, solve the correct transmission data according to the transport layer protocol, and transmit the transmission data to the receiving end application layer 44.
The receiving end application layer 44 uses the application layer protocol to solve the correct video data output.
Fig. 4 is a data transmission flow chart of a data transmission end in the embodiment of the present invention; fig. 5 is a flow chart of data reception at a data receiving end according to an embodiment of the present invention. The data transmission process of the present invention will be described with reference to fig. 4 and 5:
for data collected by a camera end (data sending end), firstly, a digital signal is encapsulated into a transport layer protocol (including a check code), then DC balance coding is carried out, each coded bit carries out DA conversion according to a proper sampling frequency, the signal is carried in the existing effective video transmission line (usually the first effective video transmission line), and the effective video line does not transmit video data but the coded digital signal; and the data receiving end samples the selected effective video line to obtain sampling points according to the AD sampling processing of the normal video, firstly performs signal filtering (filtering can be omitted for short-distance transmission), then performs grouping according to the number of sampling points of each bit, and performs preamble positioning, DC balance decoding and CRC (cyclic redundancy check) on each group of sampling point sequences. The CRC checks the correct packet data and finally resolves the correct transmission data according to the transport layer protocol. At this time, one or more effective video lines are used for transmitting digital signals, and the rear-end receiving end only needs to analyze the sampling data of the lines by software to obtain the transmitted digital signals
It should be noted that the present invention is a general coaxial digital high-speed long-distance transmission technology, and is not limited to the existing active video line transmission, and the blanking line is also feasible. If blanking lines are selected as digital transmission lines, then no active video lines are occupied. The method can be used as a new digital transmission mode simulating high-definition standards.
By adopting the digital transmission technology, for the existing analog high-definition 1080P @25fps system, if 5 lines of effective video lines are selected as digital transmission lines, the effective data transmitted by the camera to the rear end receiving end can reach 6 KB/s. If 10 rows are selected, the data rate will reach 12KB/s, and can fully carry 8K samples of audio data and other sensor signals. Compared with the prior digital signal transmission rate of about 400B/s, the transmission rate is greatly improved.
Due to the DC balanced encoding and filtering technique adopted, the error-free testing distance for the common 75-3-1 coaxial cable is more than 500 m. In the existing digital signal transmission mode, because a receiving end usually adopts a mode of receiving and re-sampling by a comparison level and does not have signal enhancement processing, the receiving performance, the distance and the setting of the comparison level are closely related, and the error rate is obviously increased after the length of a coaxial cable exceeds 300 m.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the invention should be determined from the following claims.
Claims (10)
1. A realization method for simulating high-speed long-distance data transmission of a high-definition camera is applied to a data sending end and comprises the following steps:
step S1, acquiring data collected by the analog high-definition camera, packaging the data by using an application layer protocol to obtain a digital signal, transmitting the digital signal to a transmission layer and packaging the digital signal into a transmission layer protocol;
step S2, performing DC balance coding on the data at the data link layer;
step S3, perform DA conversion on each encoded bit according to a suitable sampling frequency in the physical layer, and use the coaxial digital high-speed long-distance transmission technology to carry the converted signal in the existing effective video transmission line and transmit it to the data receiving end.
2. The method as claimed in claim 1, wherein in step S1, the application layer of the analog high definition camera processes the acquired video data into digital signals and transmits the digital signals to the transport layer, and the transport layer generates check codes for the digital signals by CRC check and encapsulates the check codes into transport layer protocol.
3. The method for realizing the high-speed long-distance data transmission of the analog high-definition camera according to claim 1, is characterized in that: in step S2, after dc-balanced encoding, a preamble sequence may be added to the front end of the data for positioning and synchronizing the data stream.
4. A realization method for simulating high-speed long-distance data transmission of a high-definition camera is applied to a data receiving end and comprises the following steps:
step S1, using RX chip to carry out AD sampling process to the obtained video signal, wherein the video signal comprises effective video transmission line carrying DA converted signal;
step S2, grouping the sampling points obtained by sampling the selected effective video transmission line according to the number of sampling points of each bit;
step S3, performing preamble positioning and DC balance decoding on each group of sampling point sequences, and performing CRC (cyclic redundancy check) check;
step S4, the correct packet data is checked by the CRC check, and the correct transmission data is resolved according to the transport layer protocol.
5. The method for realizing the high-speed long-distance data transmission of the analog high-definition camera according to claim 4, is characterized in that: in step S2, the obtained video signal is filtered before being packetized.
6. The utility model provides a simulation high definition camera high speed long distance data transmission's implementation system, is applied to the data sending end, includes:
the transmitting end application layer is used for acquiring the data acquired by the analog high-definition camera, packaging the data by using an application layer protocol to obtain a digital signal, and transmitting the digital signal to the transmitting end transmission layer;
the transmitting end transmission layer is used for generating a check code for the digital signal, packaging the check code into a transmission layer protocol and transmitting the check code to a transmitting end data link layer;
the transmitting end data link layer is used for carrying out direct current balance coding on data and then transmitting the data to the transmitting end physical layer;
and the sending end physical layer is used for carrying out DA conversion on each bit of the coded data according to a proper sampling frequency, and adopting a coaxial digital high-speed long-distance transmission technology to bear the converted signal in the existing effective video transmission line and transmit the converted signal to a data receiving end.
7. The system of claim 6, wherein the system comprises: and the transmitting end transmission layer generates a check code for the digital signal by using CRC (cyclic redundancy check) and transmits the check code to the transmitting end data link layer after packaging the check code into a transmission layer protocol.
8. The system of claim 6, wherein the system comprises: and after the direct current balance coding, the data link layer of the sending end adds a leader sequence to the front end of the data to position and synchronize the data stream.
9. A realization system for simulating high-speed long-distance data transmission of a high-definition camera is applied to a data receiving end and comprises:
the receiving end physical layer is used for carrying out AD sampling processing on the obtained video signals by using an RX chip, and grouping sampling points obtained by sampling the selected effective video transmission lines according to the number of sampling points of each bit, wherein the video signals comprise effective video transmission lines carrying DA converted signals;
the receiving end data link layer performs preamble positioning and DC balance decoding on each group of sampling point sequences and transmits the decoded data to a receiving end transmission layer;
the receiving end transmission layer is used for carrying out CRC (cyclic redundancy check) on the received data, checking correct grouped data, solving correct transmission data according to a transmission layer protocol and transmitting the correct transmission data to the receiving end application layer;
and the application layer of the receiving end utilizes an application layer protocol to solve correct video data output.
10. The system of claim 9, wherein the system comprises: the physical layer of the receiving end can also perform signal filtering on the obtained video signal before grouping.
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