CN110858865A - Data transmission method and device for simulating high-definition video - Google Patents
Data transmission method and device for simulating high-definition video Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N5/04—Synchronising
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
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- H—ELECTRICITY
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Abstract
The invention discloses a data transmission method and a data transmission device for simulating high-definition video, wherein the method comprises the following steps: step S1, receiving data to be sent; step S2, preprocessing the data before transmission, adding corresponding training data and synchronous data in the data to be transmitted according to the channel characteristics of the cable, and storing the preprocessed data into a frame blanking data cache and a line blanking data cache; step S3, reading the data to be sent in the frame blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the frame blanking data buffer on the corresponding frame blanking line gap of the video signal, reading the data to be sent in the line blanking data buffer for binary waveform modulation, and superimposing the data to be sent on the corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
Description
Technical Field
The invention relates to the technical field of signal transmission and processing, in particular to a data transmission method and device for simulating high-definition video.
Background
With the development of the camera shooting technology and the intelligent technology, the front-end intellectualization becomes possible; the front-end camera integrates an intelligent processing function, directly processes video information, and transmits the structured data (such as frame information of human faces and pedestrians, license plates, vehicle colors and the like) obtained by processing to a DVR or a middle and back-end server; in addition, the digital audio signal can also be transmitted with the analog high-definition video signal in a collinear way, so that an audio transmission cable is omitted, and the system cost and complexity are saved; the structured data or digital audio signal for each frame of video may be as many as several hundred or even kilobytes.
At present, data signals in the traditional analog high-definition video are generally transmitted by utilizing frame blanking time, and due to attenuation and interference of a coaxial cable, the data transmission rate is low, and data transmitted in each frame without distortion is limited; the audio signal in the traditional analog high-definition video is transmitted by using the line blanking time, but the analog transmission mode is a distorted transmission mode. Therefore, it is significant and necessary to realize a low-cost and high-transmission-rate co-linear transmission scheme for analog high-definition video and structured data and digital audio signals.
Disclosure of Invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a method and a device for transmitting analog high-definition video data, so as to simply and effectively solve the problem of collinear transmission of high-speed data of analog high-definition video.
In order to achieve the above and other objects, the present invention provides a data transmission method for simulating high definition video, comprising the following steps:
step S1, receiving data to be sent;
step S2, preprocessing the data before transmission, adding corresponding training data and synchronous data in the data to be transmitted according to the channel characteristics of the cable, and storing the preprocessed data into a frame blanking data cache and a line blanking data cache;
step S3, reading the data to be sent in the frame blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the frame blanking data buffer on the corresponding frame blanking line gap of the video signal, reading the data to be sent in the line blanking data buffer for binary waveform modulation, and superimposing the data to be sent on the corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
Preferably, in step S1, the structured data processed by the front-end camera is received, and the digital audio signal collected by the audio analog-to-digital converter is received.
Preferably, in step S1, each L bytes of the received data is added with corresponding redundancy information.
Preferably, the redundant information is parity information or error correction coding redundant information.
Preferably, the step S2 further includes:
step S200, determining training data of N bytes according to the channel characteristics of the coaxial cable, wherein the training data is used for providing the training data to a receiving end for channel compensation and is used as a synchronous signal for data synchronization at the receiving end;
step S201, according to the total number of bytes of data to be sent, determining that several lines of frame blanking lines are needed to send data and the number of bytes of data sent by each line of frame blanking lines, adding data synchronization information, and sending the data to a frame blanking data cache; the blanking line number of video data line used for transmitting data and the byte number of data transmitted in each blanking interval are determined, and data synchronization information is added and sent into the blanking line data buffer.
Preferably, in step S200, the training data is selected to be transmitted in the blanking interval of the video frame.
Preferably, the synchronous data is provided for a receiving end to perform data synchronization and is used as a judgment basis for judging whether valid data exists in a blanking interval of a current frame or a blanking interval of a video data line; if no synchronization information is detected for a current frame blanking line interval or a line blanking of video data, no valid data is transmitted for that frame blanking line interval or that line of video data.
Preferably, the step S3 further includes:
step S300, determining a binary data modulation waveform according to the data transmission rate;
step S301, reading data to be sent in the frame blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the frame blanking data buffer on the corresponding frame blanking line interval of the video signal, reading the data to be sent in the line blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the video signal on the corresponding video data line blanking interval of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
Preferably, in step S300, binary data 1 is mapped to a cosine signal with a period T and an amplitude H, and binary data 0 is mapped to a waveform signal with a period T and an amplitude 0.
In order to achieve the above object, the present invention further provides a data transmission device for simulating high definition video, including:
a data receiving unit, configured to receive data to be sent;
the data preprocessing unit is used for preprocessing data before transmission, adding corresponding training data and synchronous data into the data to be transmitted according to the channel characteristics of the cable, and storing the preprocessed data into a frame blanking data cache and a line blanking data cache;
and the data sending unit is used for reading the data to be sent in the frame blanking data cache, carrying out binary waveform modulation on the data, superposing the data to be sent in the frame blanking data cache on the corresponding frame blanking line gap of the video signal, reading the data to be sent in the line blanking data cache, carrying out binary waveform modulation on the data, and superposing the data to be sent on the corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data, the digital audio data and the video signal.
Compared with the prior art, the data transmission method and device for the analog high-definition video add corresponding training signals and synchronous signals to each frame of video according to the channel characteristics of the cable, so that the training signals and the synchronous signals can be utilized for subsequent receiving, and transmitted data can be recovered in a low-cost and distortion-free manner, so that large data such as intelligent structured data and digital audio can be transmitted with the analog high-definition video in a collinear manner, and the problem of collinear transmission of the data with high speed of the analog high-definition video is simply and effectively solved. The invention realizes higher data transmission rate with lower hardware and software complexity.
Drawings
FIG. 1 is a flow chart illustrating the steps of a method for transmitting data simulating high definition video according to the present invention;
FIG. 2 is a detailed flowchart of step S2 according to an embodiment of the present invention;
FIG. 3 is a detailed flowchart of step S3 according to an embodiment of the present invention;
FIG. 4 is a diagram of binary modulation waveforms in an embodiment of the present invention;
FIG. 5 is a diagram illustrating a line data transmission for frame blanking according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating line blanking interval data transmission in accordance with an embodiment of the present invention;
FIG. 7 is a system architecture diagram of an analog HD video data transmission device according to the present invention;
FIG. 8 is a detailed block diagram of the data pre-processing unit 702 according to an embodiment of the present invention;
fig. 9 is a detailed structure diagram of the data sending unit 703 in the embodiment of the present invention;
fig. 10 is a flowchart illustrating a data transmission method for analog high definition video according to an embodiment of the 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 a method for transmitting data of an analog high definition video according to the present invention. As shown in fig. 1, the data transmission method for simulating high definition video of the present invention includes the following steps:
step S1, receiving data to be transmitted. Specifically, in step 701, receiving the structured data intelligently processed by the front-end camera; and also receives the digital audio signal collected by the audio ADC (analog-to-digital converter). Preferably, in step 701, the received data is further added with corresponding redundancy information for every L bytes, where the redundancy information may be parity information or error correction coding redundancy information. Specifically, each L0 bytes of the received structured data is added with corresponding parity check information; the received audio data is added with corresponding parity information for a group of every L1 bytes.
In step S2, the data before transmission is preprocessed.
Specifically, as shown in fig. 2, step S2 further includes:
step S200, determining and adding training data. In step S200, N bytes of training data are determined according to the channel characteristics of the coaxial cable, the training data is mainly provided to the receiving end for channel compensation, the training data can also be used as a synchronization signal for data synchronization at the receiving end, and the training data is selectively transmitted in the blanking interval of the video frame.
Step S201, add synchronization data information. Whether data is transmitted in the frame blanking interval or in the video data line blanking interval, synchronization data of several bits (bits) is required to be added in front of the data. Specifically, according to the total number of bytes of data to be sent, determining that several lines of frame blanking lines are needed to send data and the number of bytes of data sent by each line of frame blanking lines, adding data synchronization information, and sending the data to a frame blanking data cache; the blanking line number of video data line used for transmitting data and the byte number of data transmitted in each blanking interval are determined, and data synchronization information is added and sent into the blanking line data buffer. The synchronous data is provided for a receiving end to carry out data synchronization and is used as a judgment basis for judging whether effective data exists in a blanking interval of a current frame or a blanking interval of a video data line; if no synchronization information is detected for a current frame blanking line interval or a line blanking of video data, no valid data is transmitted for that frame blanking line interval or that line of video data.
Step S3, determining a binary data modulation waveform according to the data transmission rate, reading data to be transmitted in the frame blanking data buffer for binary waveform modulation, and superimposing the binary waveform modulation on the corresponding frame blanking line gap of the video signal, reading data to be transmitted in the line blanking data buffer for binary waveform modulation, and superimposing the binary waveform modulation on the corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
Specifically, as shown in fig. 3, step S3 further includes:
step S300, determining a binary data modulation waveform according to the data transmission rate. In the embodiment of the present invention, as shown in fig. 4, binary data 1 is mapped to a cosine signal with a period T and an amplitude H, and binary data 0 is mapped to a waveform signal with a period T and an amplitude 0.
Step S301, reading data to be sent in the frame blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the frame blanking data buffer on the corresponding frame blanking line interval of the video signal, reading the data to be sent in the line blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the video signal on the corresponding video data line blanking interval of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
Specifically, the data to be transmitted in the read frame blanking data buffer is subjected to binary waveform modulation and is superimposed on the corresponding frame blanking line interval of the video signal, as shown in fig. 5, the frame blanking line interval transmission data start time is later than the line synchronization time Td1 clock cycles, and the data transmission end time depends on the number of bytes of data transmitted per line of frame blanking line. Reading data to be transmitted in the line blanking data buffer, performing binary waveform modulation, and superimposing the data on a corresponding video data line blanking interval of the video signal, as shown in fig. 6, where the line blanking interval transmission data start time is later than the line synchronization time Td2 clock cycles; the end of data transmission depends on the number of bytes of data transmitted in each line of video data line blanking interval (the number of bytes of data transmitted in video data line blanking interval, it is necessary to ensure that a corresponding time gap is maintained with the valid video data to prevent data crosstalk).
Therefore, in the invention, the frame blanking interval of the video signal and the blanking interval of the video data line can be used for transmitting data information, for example, structured data can be added on the frame blanking line for transmission, and digital audio information is added on the blanking interval of the video data line for transmission, thereby simply and effectively solving the problem of high-speed data collinear transmission of analog high-definition video.
Fig. 7 is a system architecture diagram of a data transmission device for simulating high definition video according to the present invention. As shown in fig. 7, the data transmission device for simulating high definition video according to the present invention includes:
a data receiving unit 701, configured to receive data to be transmitted. Specifically, the data receiving unit 701 receives the structured data intelligently processed by the front-end camera; and also receives the digital audio signal collected by the audio ADC (analog-to-digital converter). Preferably, the data receiving unit 701 further adds corresponding redundancy information to the received data in a group of L bytes, where the redundancy information may be parity information or error correction coding redundancy information. Specifically, each L0 bytes of the received structured data is added with corresponding parity check information; the received audio data is added with corresponding parity information for a group of every L1 bytes.
A data preprocessing unit 702, configured to preprocess data before transmission.
Specifically, as shown in fig. 8, the data preprocessing unit 702 further includes:
a training data adding unit 7021 configured to determine and add training data. Specifically, training data adding unit 7021 determines N bytes of training data according to the channel characteristics of the coaxial cable, the main function of the training data is to provide the training data to the receiving end for channel compensation, the training data can also be used as a synchronization signal at the receiving end for data synchronization, and the training data is selectively transmitted in the blanking interval of the video frame.
A synchronization data information adding unit 7022 for adding synchronization data information. Whether data is transmitted in the frame blanking interval or in the video data line blanking interval, synchronization data of several bits (bits) is required to be added in front of the data. Specifically, according to the total number of bytes of data to be sent, determining that several lines of frame blanking lines are needed to send data and the number of bytes of data sent by each line of frame blanking lines, adding data synchronization information, and sending the data to a frame blanking data cache; the blanking line number of video data line used for transmitting data and the byte number of data transmitted in each blanking interval are determined, and data synchronization information is added and sent into the blanking line data buffer. The synchronous data is provided for a receiving end to carry out data synchronization and is used as a judgment basis for judging whether effective data exists in a blanking interval of a current frame or a blanking interval of a video data line; if no synchronization information is detected for a current frame blanking line interval or a line blanking of video data, no valid data is transmitted for that frame blanking line interval or that line of video data.
The data sending unit 703 is configured to determine a binary data modulation waveform according to the data transmission rate, read data to be sent in the frame blanking data buffer for binary waveform modulation, and superimpose the binary waveform modulation on a corresponding frame blanking line gap of the video signal, read data to be sent in the line blanking data buffer for binary waveform modulation, and superimpose the binary waveform modulation on a corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
Specifically, as shown in fig. 9, the data sending unit 703 further includes:
a modulation waveform determining unit 7031, configured to determine a binary data modulation waveform according to the data transmission rate. In the embodiment of the present invention, binary data 1 is mapped to a cosine signal with a period T and an amplitude H, and binary data 0 is mapped to a waveform signal with a period T and an amplitude 0.
And a modulation waveform transmitting unit 7032, configured to read data to be transmitted in the frame blanking data buffer, perform binary waveform modulation, and superimpose the data onto a corresponding frame blanking line gap of the video signal, and read data to be transmitted in the line blanking data buffer, perform binary waveform modulation, and superimpose the data onto a corresponding video data line blanking gap of the video signal, thereby completing collinear transmission of the structured data and the digital audio data with the video signal.
Specifically, the data to be transmitted in the read frame blanking data buffer is subjected to binary waveform modulation and is superimposed on the corresponding frame blanking line interval of the video signal, as shown in fig. 5, the frame blanking line interval transmission data start time is later than the line synchronization time Td1 clock cycles, and the data transmission end time depends on the number of bytes of data transmitted per line of frame blanking line. Reading data to be transmitted in the line blanking data buffer, performing binary waveform modulation, and superimposing the data on a corresponding video data line blanking interval of the video signal, as shown in fig. 6, where the line blanking interval transmission data start time is later than the line synchronization time Td2 clock cycles; the end of data transmission depends on the number of bytes of data transmitted in each line of video data line blanking interval (the number of bytes of data transmitted in video data line blanking interval, it is necessary to ensure that a corresponding time gap is maintained with the valid video data to prevent data crosstalk).
Fig. 10 is a flowchart illustrating a data transmission method for analog high definition video according to an embodiment of the invention. As shown in fig. 10, the data transmission method of the analog high definition video of the present invention includes:
step 101, receiving data to be transmitted. In the embodiment, receiving structured data intelligently processed by a front-end camera; simultaneously receiving digital audio signals collected by the audio ADC, and adding corresponding parity check information to each L0 bytes of the received structured data; the received audio data is added with corresponding parity information for a group of every L1 bytes.
And 102, preprocessing the data before transmission. Specifically, according to the channel characteristics of the coaxial cable, determining training signals of N0 bytes, and sending the training signals into a frame data sending buffer; the structured data is transmitted by using frame blanking line gaps, each line transmits N bytes, 1 byte of synchronous signal is added in front of every N-1 byte of structured data, and the data is sent to a frame data sending buffer; the digital audio signal is transmitted by using blanking intervals of video data lines, and 8M +4 bits of data are transmitted in each line; and adding a 4-bit synchronization signal before transmitting every M bytes of data, and transmitting the synchronization signal into a line data transmission buffer.
Step 103, modulating the data waveform. Determining a binary data modulation waveform according to the data transmission rate; binary data 1 is mapped to a cosine signal with a period of T and an amplitude of H, and binary data 0 is mapped to a waveform signal with a period of T and an amplitude of 0.
And 104, transmitting the modulation waveform. The data to be transmitted in the frame blanking data buffer is read, modulated with the binary waveform of step 103, and superimposed on the corresponding frame blanking line interval of the video signal. The data to be transmitted in the line blanking data buffer is read, modulated by the binary waveform of step 103, and superimposed on the corresponding video data line blanking interval of the video signal. Thereby accomplishing the collinear transmission of the structured data and the digital audio data with the video signal.
In summary, the data transmission method and device for the analog high-definition video add corresponding training signals and synchronization signals to each frame of video according to the channel characteristics of the cable, so that the training signals and synchronization signals can be utilized for subsequent receiving, and transmitted data can be recovered in a low-cost and distortion-free manner, so that large data such as intelligent structured data and digital audio can be transmitted in a collinear manner with the analog high-definition video, and the problem of collinear transmission of high-rate data of the analog high-definition video is simply and effectively solved. The invention realizes higher data transmission rate with lower hardware and software complexity.
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 data transmission method for simulating high-definition video comprises the following steps:
step S1, receiving data to be sent;
step S2, preprocessing the data before transmission, adding corresponding training data and synchronous data in the data to be transmitted according to the channel characteristics of the cable, and storing the preprocessed data into a frame blanking data cache and a line blanking data cache;
step S3, reading the data to be sent in the frame blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the frame blanking data buffer on the corresponding frame blanking line gap of the video signal, reading the data to be sent in the line blanking data buffer for binary waveform modulation, and superimposing the data to be sent on the corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
2. The method for transmitting data of an analog high definition video according to claim 1, characterized in that: in step S1, the structured data processed by the front-end camera is received, and the digital audio signal collected by the audio adc is received.
3. The method for transmitting data of an analog high definition video according to claim 2, characterized in that: in step S1, add corresponding redundancy information to each L bytes of the received data.
4. A method for data transmission of analog high definition video according to claim 3, characterized in that: the redundant information is parity check information or error correction coding redundant information.
5. The method for transmitting data of analog high definition video according to claim 2, wherein step S2 further comprises:
step S200, determining training data of N bytes according to the channel characteristics of the coaxial cable, wherein the training data is used for providing the training data to a receiving end for channel compensation and is used as a synchronous signal for data synchronization at the receiving end;
step S201, according to the total number of bytes of data to be sent, determining that several lines of frame blanking lines are needed to send data and the number of bytes of data sent by each line of frame blanking lines, adding data synchronization information, and sending the data to a frame blanking data cache; the blanking line number of video data line used for transmitting data and the byte number of data transmitted in each blanking interval are determined, and data synchronization information is added and sent into the blanking line data buffer.
6. The method for transmitting data of an analog high definition video according to claim 2, characterized in that: in step S200, the training data is selected to be transmitted in the blanking interval of the video frame.
7. The method for transmitting data of an analog high definition video according to claim 6, characterized in that: the synchronous data is provided for a receiving end to carry out data synchronization and is used as a judgment basis for judging whether effective data exists in a blanking interval of a current frame or a blanking interval of a video data line; if no synchronization information is detected for a current frame blanking line interval or a line blanking of video data, no valid data is transmitted for that frame blanking line interval or that line of video data.
8. The method for transmitting data of analog high definition video according to claim 2, wherein step S3 further comprises:
step S300, determining a binary data modulation waveform according to the data transmission rate;
step S301, reading data to be sent in the frame blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the frame blanking data buffer on the corresponding frame blanking line interval of the video signal, reading the data to be sent in the line blanking data buffer for binary waveform modulation, and superimposing the data to be sent in the video signal on the corresponding video data line blanking interval of the video signal, thereby completing the collinear transmission of the structured data and the digital audio data with the video signal.
9. The method for transmitting data of an analog high definition video according to claim 8, wherein: in step S300, binary data 1 is mapped to a cosine signal with a period T and an amplitude H, and binary data 0 is mapped to a waveform signal with a period T and an amplitude 0.
10. A data transmission device for simulating high definition video, comprising:
a data receiving unit, configured to receive data to be sent;
the data preprocessing unit is used for preprocessing data before transmission, adding corresponding training data and synchronous data into the data to be transmitted according to the channel characteristics of the cable, and storing the preprocessed data into a frame blanking data cache and a line blanking data cache;
and the data sending unit is used for reading the data to be sent in the frame blanking data cache, carrying out binary waveform modulation on the data, superposing the data to be sent in the frame blanking data cache on the corresponding frame blanking line gap of the video signal, reading the data to be sent in the line blanking data cache, carrying out binary waveform modulation on the data, and superposing the data to be sent on the corresponding video data line blanking gap of the video signal, thereby completing the collinear transmission of the structured data, the digital audio data and the video signal.
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| JP2017121069A (en) * | 2017-02-21 | 2017-07-06 | 三菱電機エンジニアリング株式会社 | Video signal processor and video signal processing method |
| CN207475696U (en) * | 2017-10-20 | 2018-06-08 | 杭州海康威视数字技术股份有限公司 | A kind of analog video camera |
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| CN112954165A (en) * | 2021-02-09 | 2021-06-11 | 杭州海康威视数字技术股份有限公司 | Analog camera, decoder and monitoring system |
| CN113691757A (en) * | 2021-08-10 | 2021-11-23 | 浙江大华技术股份有限公司 | Data transmission method, device, equipment and medium |
| CN113691757B (en) * | 2021-08-10 | 2023-08-11 | 浙江大华技术股份有限公司 | Data transmission method, device, equipment and medium |
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