CN110933463B - Data transmission system - Google Patents

Data transmission system Download PDF

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Publication number
CN110933463B
CN110933463B CN201911127563.6A CN201911127563A CN110933463B CN 110933463 B CN110933463 B CN 110933463B CN 201911127563 A CN201911127563 A CN 201911127563A CN 110933463 B CN110933463 B CN 110933463B
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data
video
analog
spread spectrum
module
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CN110933463A (en
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吕炳赟
方伟
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Zhejiang Xinsheng Electronic Technology Co Ltd
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Zhejiang Xinsheng Electronic Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display

Abstract

The invention discloses a data transmission system, because in the embodiment of the invention, a video sending device converts forward auxiliary data into a first spread spectrum modulation sequence through a first spread spectrum transmitter, and a superposition module superposes the first spread spectrum modulation sequence and video data to be superposed and sends the superposed video data to a second data receiving module in a video receiving device. The video receiving device converts the reverse auxiliary data into a second spread spectrum modulation sequence through a second spread spectrum transmitter and sends the second spread spectrum modulation sequence to a first data receiving module in the video sending device. The embodiment of the invention can realize the collinear transmission of the video data and the bidirectional auxiliary data, simultaneously can give consideration to the compatibility of the original video data transmission system, can maximally utilize equipment in the original video data transmission system, and effectively reduces the system cost.

Description

Data transmission system
Technical Field
The invention relates to the technical field of data transmission, in particular to a data transmission system.
Background
In the security field, the requirements of adding a two-way talkback audio signal, a control command and a feedback command, additional information of video data, system upgrading data and the like on an analog video system are increasing. Since the main role of an analog video system is to process and transmit video data, such other data, which is independent of the video data, can be collectively referred to as ancillary data. With the continuous upgrade of security systems, the requirement for the transmission of the auxiliary data is higher and higher, and the data is reflected in two aspects in a centralized manner: bi-directional transmission and reliable transmission. The bidirectional transmission means that the auxiliary data can be transmitted from the video sending equipment to the video receiving equipment and the data can also be transmitted from the video receiving equipment to the video sending equipment; reliable transmission means that the transmission reliability of the auxiliary data, such as the interference resistance, the error rate, etc., is required to be higher and higher.
The conventional auxiliary data transmission scheme is to add additional transmission cables, such as two twisted pair cables or RS485 signal lines, respectively, for implementing auxiliary data transmission from a transmitting device (TX, e.g., an analog camera) of an analog video signal to a receiving device (RX, e.g., DVR) of the analog video signal, and from the receiving device of the analog video signal to the transmitting device of the analog video signal, thereby increasing the system cost and complexity of installation and maintenance.
In order to save extra transmission cables, the prior art provides a collinear transmission scheme, which maps and encodes the auxiliary data, and then masquerades the auxiliary data into luminance or chrominance data to be mapped into video data, so as to realize the collinear transmission of the auxiliary data and the video data. The scheme has a problem that corresponding inverse coding is required at a receiving end, so that since compatibility with the original video data transmission system is not considered, the scheme needs to replace all video transmitting devices and video receiving devices in the original video data transmission system, and the cost of the system is also increased.
Disclosure of Invention
The embodiment of the invention provides a data transmission system, which is used for realizing transmission of video and bidirectional auxiliary data on the premise of not increasing system cost and not influencing video quality.
An embodiment of the present invention provides a data transmission system, where the system includes: a video transmitting device and a video receiving device; the video sending equipment comprises a first spread spectrum transmitter, a superposition module and a first data receiving module; the video receiving device comprises a second spread spectrum transmitter and a second data receiving module;
the first spread spectrum transmitter is connected with the superposition module and used for converting forward auxiliary data into a first spread spectrum modulation sequence and transmitting the first spread spectrum modulation sequence to the superposition module;
the superposition module is connected with the second data receiving module and used for carrying out superposition processing on the first spread spectrum modulation sequence and the video data to be superposed and sending the video data to the second data receiving module;
the second spread spectrum transmitter is connected with the first data receiving module, and is configured to convert the reverse ancillary data into a second spread spectrum modulation sequence, and send the second spread spectrum modulation sequence to the first data receiving module.
Further, the video transmitting device further comprises a video encoding module;
the video coding module is connected with the superposition module and used for coding the original video data into the composite video data in the digital format, obtaining the video data to be superposed and sending the video data to the superposition module.
Further, the video sending device further comprises a first sampling rate change module and a second sampling rate change module; wherein the output sampling rates of the first sampling rate change module and the second sampling rate change module are the same;
the first sampling rate change module is respectively connected with the video coding module and the superposition module and is used for carrying out sampling rate conversion processing on the video data to be superposed, which is sent by the video coding module, and sending the video data to be superposed, which is subjected to the sampling rate conversion processing, to the superposition module;
the second sampling rate change module is respectively connected with the first spread spectrum transmitter and the superposition module, and is used for performing sampling rate conversion processing on a first spread spectrum modulation sequence sent by the first spread spectrum transmitter and sending the first spread spectrum modulation sequence subjected to the sampling rate conversion processing to the superposition module.
Further, the video transmitting apparatus further includes a first digital-to-analog converter; the video receiving device further comprises a first analog-to-digital converter;
the first digital-to-analog converter is respectively connected with the superposition module and the first analog-to-digital converter, and is used for converting data subjected to superposition processing into analog data and sending the analog data to the first analog-to-digital converter;
the first analog-to-digital converter is also connected with the second data receiving module and used for converting the analog data into digital data and sending the digital data to the second data receiving module.
Further, the video transmission apparatus further includes a first transmission analog filter;
the first transmit analog filter is respectively connected with the first digital-to-analog converter and the first analog-to-digital converter, and is configured to perform first filtering processing on the analog data and send the analog data after the first filtering processing to the first analog-to-digital converter.
Further, the video receiving apparatus further includes a first receiving analog filter;
the first receiving analog filter is respectively connected with the first transmitting analog filter and the first analog-to-digital converter, and is used for performing second filtering processing on the analog data after the first filtering processing and sending the analog data after the second filtering processing to the first analog-to-digital converter.
Further, the video receiving device further comprises a third sampling rate change module and a fourth sampling rate change module;
the third sampling rate change module and the fourth sampling rate change module are respectively connected with the first analog-to-digital converter and the second data receiving module;
the third sampling rate change module is used for performing sampling rate conversion processing on the digital data to obtain digital video data and sending the digital video data to the second data receiving module; wherein an output sampling rate of the third sampling rate change module is the same as an input sampling rate of the first sampling rate change module;
the fourth sampling rate change module is configured to perform sampling rate conversion processing on the digital data to obtain a first digital spread spectrum modulation sequence, and send the first digital spread spectrum modulation sequence to the second data receiving module; wherein an output sampling rate of the fourth sampling rate change module is the same as an input sampling rate of the second sampling rate change module.
Further, the video receiving device further comprises a first spread spectrum receiver and a video decoding module;
the first spread spectrum receiver is respectively connected with the fourth sampling rate changing module and the second data receiving module, and is used for converting the first digital spread spectrum modulation sequence into forward auxiliary data and sending the forward auxiliary data to the second data receiving module;
the video decoding module is respectively connected with the third sampling rate change module and the second data receiving module, and is used for decoding the digital video data and sending the decoded digital video data to the second data receiving module.
Further, the video receiving apparatus further includes a second digital-to-analog converter; the video transmitting device further comprises a second analog-to-digital converter;
the second digital-to-analog converter is respectively connected with the second spread spectrum transmitter and the second analog-to-digital converter, and is configured to convert the second spread spectrum modulation sequence into a second analog spread spectrum modulation sequence and send the second analog spread spectrum modulation sequence to the second analog-to-digital converter;
the second analog-to-digital converter is further connected to the first data receiving module, and is configured to convert the second analog spread spectrum modulation sequence into a second digital spread spectrum modulation sequence, and send the second digital spread spectrum modulation sequence to the first data receiving module.
Further, the video receiving apparatus further includes a second transmit analog filter;
the second transmitting analog filter is respectively connected with the second digital-to-analog converter and the second analog-to-digital converter, and is configured to perform third filtering processing on the second analog spread spectrum modulation sequence, and send the second analog spread spectrum modulation sequence after the third filtering processing to the second analog-to-digital converter.
Further, the video transmission apparatus further includes a second reception analog filter;
the second receiving analog filter is respectively connected with the second transmitting analog filter and the second analog-to-digital converter, and is configured to perform fourth filtering processing on the third filtered second analog spread spectrum modulation sequence, and send the fourth filtered second analog spread spectrum modulation sequence to the second analog-to-digital converter.
Further, the video transmission apparatus further includes a resampling filter;
the resampling filter is respectively connected with the second analog-to-digital converter and the first data receiving module, and is configured to perform fifth filtering processing and sampling rate conversion processing on the second digital spread spectrum modulation sequence to obtain a third digital spread spectrum modulation sequence, and send the third digital spread spectrum modulation sequence to the first data receiving module.
Further, the video transmission apparatus further includes a second spread spectrum receiver;
the second spread spectrum receiver is respectively connected with the resampling filter and the first data receiving module, and is configured to convert the third digital spread spectrum modulation sequence into reverse auxiliary data, and send the reverse auxiliary data to the first data receiving module.
Further, the system also comprises a coupling connection unit;
the coupling connection unit is respectively connected with the video sending device and the video receiving device and is used for coupling data transmitted between the video sending device and the video receiving device.
Further, the system further comprises a control unit;
the control unit is respectively connected with the video sending equipment and the video receiving equipment and is used for configuring relevant parameters for the video sending equipment and the video receiving equipment.
Further, the system also comprises a clock unit;
the clock unit is respectively connected with the video transmitting equipment and the video receiving equipment and is used for configuring working clocks for the video transmitting equipment and the video receiving equipment.
Further, the first spread spectrum modulation sequence and the second spread spectrum modulation sequence occupy different spread spectrum resources.
An embodiment of the present invention provides a data transmission system, where the system includes: a video transmitting device and a video receiving device; the video sending equipment comprises a first spread spectrum transmitter, a superposition module and a first data receiving module; the video receiving device comprises a second spread spectrum transmitter and a second data receiving module; the first spread spectrum transmitter is connected with the superposition module and used for converting forward auxiliary data into a first spread spectrum modulation sequence and transmitting the first spread spectrum modulation sequence to the superposition module; the superposition module is connected with the second data receiving module and used for carrying out superposition processing on the first spread spectrum modulation sequence and the video data to be superposed and sending the video data to the second data receiving module; the second spread spectrum transmitter is connected with the first data receiving module, and is configured to convert the reverse ancillary data into a second spread spectrum modulation sequence, and send the second spread spectrum modulation sequence to the first data receiving module.
In the embodiment of the invention, the video sending device converts the forward auxiliary data into the first spread spectrum modulation sequence through the first spread spectrum transmitter, and the superposition module superposes the first spread spectrum modulation sequence and the video data to be superposed and sends the superposed video data to the second data receiving module in the video receiving device. The video receiving device converts the reverse auxiliary data into a second spread spectrum modulation sequence through a second spread spectrum transmitter and sends the second spread spectrum modulation sequence to a first data receiving module in the video sending device. The embodiment of the invention can realize the collinear transmission of the video data and the bidirectional auxiliary data, simultaneously can give consideration to the compatibility of the original video data transmission system, can maximally utilize equipment in the original video data transmission system, and effectively reduces the system cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 5 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 7 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 8 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 9 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 10 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 11 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 12 is a schematic structural diagram of a data transmission system according to embodiment 1 of the present invention;
fig. 13 is a flow chart of a video sending device sending video data and forward auxiliary data according to an embodiment of the present invention;
fig. 14 is a flowchart of a video transmitting apparatus receiving reverse auxiliary data according to an embodiment of the present invention;
fig. 15 is a flow chart of a video receiving device receiving video data and forward ancillary data according to an embodiment of the present invention;
fig. 16 is a flowchart of a video receiving device transmitting reverse auxiliary data according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the attached drawings, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
fig. 1 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention, where the system includes: a video transmitting apparatus 11 and a video receiving apparatus 12; the video transmission device 11 comprises a first spread spectrum transmitter 111, an overlay module 112 and a first data receiving module 113; the video receiving device 12 comprises a second spread-spectrum transmitter 121 and a second data receiving module 122;
the first spread spectrum transmitter 111 is connected to the superposition module 112, and is configured to convert the forward auxiliary data into a first spread spectrum modulation sequence, and send the first spread spectrum modulation sequence to the superposition module 112;
the superimposing module 112 is connected to the second data receiving module 122, and is configured to perform superimposing processing on the first spread spectrum modulation sequence and the video data to be superimposed, and send the superimposed video data to the second data receiving module 122;
the second spread-spectrum transmitter 121 is connected to the first data receiving module 113, and is configured to convert the reverse auxiliary data into a second spread-spectrum modulation sequence, and send the second spread-spectrum modulation sequence to the first data receiving module 113.
As shown in fig. 1, a data transmission system provided in an embodiment of the present invention includes a video sending device and a video receiving device, where the video sending device includes a first spread-spectrum transmitter, an overlay module, and a first data receiving module; the video receiving device includes a second spread-spectrum transmitter and a second data receiving module.
In the embodiment of the present invention, the auxiliary data transmitted from the video transmitting apparatus to the video receiving apparatus is referred to as forward auxiliary data, and the auxiliary data transmitted from the video receiving apparatus to the video transmitting apparatus is referred to as reverse auxiliary data. And the first spread spectrum transmitter in the video transmitting equipment is used for converting the forward auxiliary data into a first spread spectrum modulation sequence and then transmitting the first spread spectrum modulation sequence to the superposition module. In addition, the superimposition module further receives video data to be superimposed, where the video data to be superimposed may be original video data or processed video data, and the video data in the embodiment of the present invention includes analog video data. And the superposition module carries out superposition processing on the received first spread spectrum modulation sequence and the video data to be superposed and then sends the superposed first spread spectrum modulation sequence and the video data to a second data receiving module in the video receiving equipment. Therefore, data transmission from the video sending equipment to the video receiving equipment is realized.
In an embodiment of the present invention, the second spread-spectrum transmitter in the video receiving device converts the reverse ancillary data into a second spread-spectrum modulation sequence, and then transmits the second spread-spectrum modulation sequence to the first data receiving module in the video transmitting device. Therefore, data transmission from the video receiving equipment to the video sending equipment is realized.
In the embodiment of the invention, the video sending device converts the forward auxiliary data into the first spread spectrum modulation sequence through the first spread spectrum transmitter, and the superposition module superposes the first spread spectrum modulation sequence and the video data to be superposed and sends the superposed video data to the second data receiving module in the video receiving device. The video receiving device converts the reverse auxiliary data into a second spread spectrum modulation sequence through a second spread spectrum transmitter and sends the second spread spectrum modulation sequence to a first data receiving module in the video sending device. The embodiment of the invention can realize the collinear transmission of the video data and the bidirectional auxiliary data, simultaneously can give consideration to the compatibility of the original video data transmission system, can maximally utilize equipment in the original video data transmission system, and effectively reduces the system cost.
Example 2:
in the data transmission process, in order to meet the requirement of the video receiving device on the video data format, on the basis of the above embodiment, in the embodiment of the present invention, the video sending device further includes a video encoding module 114;
the video encoding module 114 is connected to the overlay module 112, and is configured to encode the original video data into composite video data in a digital format, obtain video data to be overlaid, and send the video data to the overlay module 112.
As shown in fig. 2, the video sending device further includes a video encoding module, where the video encoding module may perform encoding processing on original video data according to a preset format, and in the embodiment of the present invention, data obtained after encoding processing on the original video data is used as data to be superimposed. And the superposition module carries out superposition processing on the first spread spectrum modulation sequence and the data to be superposed obtained by coding processing, and sends the data to be superposed to the video receiving equipment. The video receiving device may be provided with a video decoding module corresponding to the video encoding module, and the video decoding module in the video receiving device performs decoding processing on the encoded video data to obtain the decoded video data.
Example 3:
in order to ensure that the superimposing module can perform superimposing processing on the first spread spectrum modulation sequence and the video data to be superimposed, on the basis of the foregoing embodiments, in an embodiment of the present invention, the video sending device further includes a first sampling rate changing module 115 and a second sampling rate changing module 116; wherein the output sampling rates of the first sampling rate change module 115 and the second sampling rate change module 116 are the same;
the first sampling rate change module 115 is respectively connected to the video encoding module 114 and the overlay module 112, and is configured to perform sampling rate conversion processing on the video data to be overlaid, which is sent by the video encoding module 114, and send the video data to be overlaid, which is subjected to the sampling rate conversion processing, to the overlay module 112;
the second sampling rate changing module 116 is respectively connected to the first spread spectrum transmitter 111 and the superposition module 112, and is configured to perform sampling rate conversion processing on the first spread spectrum modulation sequence sent by the first spread spectrum transmitter 111, and send the first spread spectrum modulation sequence after the sampling rate conversion processing to the superposition module 112.
In the embodiment of the present invention, there may be a case where the sampling rates of the first spread spectrum modulation sequence output by the first spread spectrum transmitter and the video data to be superimposed output by the video coding module are different, and in this case, the superimposing module cannot superimpose the first spread spectrum modulation sequence and the video data to be superimposed. In order to solve the problem, as shown in fig. 3, the video sending device further includes a first sampling rate changing module and a second sampling rate changing module, where the first sampling rate changing module is configured to perform sampling rate conversion processing on the video data to be superimposed, and the second sampling rate changing module is configured to perform sampling rate conversion processing on the first spread spectrum modulation sequence. And the output sampling rates of the first sampling rate change module and the second sampling rate change module are the same.
For example, the sampling rate of the first spread spectrum modulation sequence is 30Hz, the sampling rate of the video data to be superimposed is 20Hz, and the output sampling rates of the first sampling rate changing module and the second sampling rate changing module are both set to be 60Hz, for example, so that the sampling rates of the first spread spectrum modulation sequence after the sampling rate conversion processing and the video data to be superimposed are both 60Hz, and the superimposing module can superimpose the first spread spectrum modulation sequence and the video data to be superimposed, which have the sampling rates of both 60 Hz.
In the embodiment of the present invention, the video sending device further includes a first sampling rate changing module and a second sampling rate changing module, where the first sampling rate changing module is configured to perform sampling rate conversion processing on the video data to be superimposed, and the second sampling rate changing module is configured to perform sampling rate conversion processing on the first spread spectrum modulation sequence. And the output sampling rates of the first sampling rate change module and the second sampling rate change module are the same. Therefore, the sampling rate of the first spread spectrum modulation sequence after the sampling rate conversion processing and the sampling rate of the video data to be superposed can be ensured to be the same, and the superposition module can be further ensured to carry out superposition processing on the first spread spectrum modulation sequence and the video data to be superposed.
Example 4:
since the data transmission in the embodiment of the present invention includes transmission of video data, the video data includes analog standard definition video data, analog high definition video data, and the like. Although the video transmitting apparatus and the video receiving apparatus can perform corresponding processing, such as video encoding processing, sample rate conversion processing, and the like, on video data in accordance with digital circuits, transmission of analog data is still performed during data transmission. In order to realize the transmission of analog data between the video transmitting device and the video receiving device, on the basis of the above embodiments, in the embodiment of the present invention, the video transmitting device 11 further includes a first digital-to-analog converter 117; the video receiving apparatus 12 further comprises a first analog-to-digital converter 123;
the first digital-to-analog converter 117 is respectively connected to the superposition module 112 and the first analog-to-digital converter 123, and is configured to convert data after superposition processing into analog data and send the analog data to the first analog-to-digital converter 123;
the first analog-to-digital converter 123 is further connected to the second data receiving module 122, and is configured to convert the analog data into digital data and send the digital data to the second data receiving module 122.
As shown in fig. 4, in the data transmission system provided in the embodiment of the present invention, the video sending apparatus 11 further includes a first digital-to-analog converter 117; video receiving device 12 also includes a first analog-to-digital converter 123. The data after the superposition processing output by the superposition module are digital data, the first digital-to-analog converter DAC is connected with the superposition module, the data after the superposition processing are converted into analog data, and then the analog data are transmitted to the video receiving equipment. A first analog-to-digital converter ADC in the video receiving device is respectively connected with a first digital-to-analog converter DAC and a second data receiving module, and the first analog-to-digital converter ADC converts received analog data into digital data and then transmits the digital data to the second data receiving module.
Example 5:
in order to reduce noise interference, on the basis of the above embodiments, in the embodiment of the present invention, the video sending apparatus 11 further includes a first transmit analog filter 118;
the first transmit analog filter 118 is connected to the first digital-to-analog converter 117 and the first analog-to-digital converter 123, and configured to perform a first filtering process on the analog data, and send the analog data after the first filtering process to the first analog-to-digital converter 123.
As shown in fig. 5, the video transmitting apparatus 11 further includes a first transmitting analog filter 118, and the first transmitting analog filter 118 is respectively connected to the first digital-to-analog converter 117 and the first analog-to-digital converter 123. Wherein the first transmit analog filter may be a low pass filter, an anti-aliasing filter, or the like. The first transmit analog filter may perform preliminary noise filtering on the analog video signal.
In addition, to further mitigate noise interference, as shown in fig. 5, the video receiving apparatus 12 further includes a first receiving analog filter 124;
the first receiving analog filter 124 is respectively connected to the first transmitting analog filter 118 and the first analog-to-digital converter 123, and is configured to perform a second filtering process on the analog data after the first filtering process, and send the analog data after the second filtering process to the first analog-to-digital converter 123.
In the embodiment of the invention, in the video sending equipment, the first transmitting analog filter is used for preliminarily filtering the noise, and in the video receiving equipment, the first receiving analog filter is used for filtering the residual noise again, so that the noise interference is further reduced, and the quality of the transmission data is ensured. By arranging the first transmitting analog filter and the first receiving analog filter, the data transmission system provided by the embodiment of the invention has certain noise filtering capacity, and the noise capable of being filtered is 20-30 millivolts (mV).
Example 6:
since the video transmitting apparatus performs the sampling rate conversion processing and the superposition processing on the video data and the first spread spectrum modulation sequence, in order to restore the video data and the spread spectrum modulation sequence, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 6, the video receiving apparatus 12 further includes a third sampling rate changing module 125 and a fourth sampling rate changing module 126;
the third sampling rate variation module 125 and the fourth sampling rate variation module 126 are respectively connected to the first analog-to-digital converter 123 and the second data receiving module 122;
the third sampling rate changing module 125 is configured to perform sampling rate conversion processing on the digital data to obtain digital video data, and send the digital video data to the second data receiving module; wherein an output sampling rate of the third sampling rate change module is the same as an input sampling rate of the first sampling rate change module;
the fourth sampling rate changing module 126 is configured to perform sampling rate conversion processing on the digital data to obtain a first digital spread spectrum modulation sequence, and send the first digital spread spectrum modulation sequence to the second data receiving module; wherein an output sampling rate of the fourth sampling rate change module is the same as an input sampling rate of the second sampling rate change module.
Example 7:
to achieve the reception of the forward auxiliary data and the video data, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 7, the video receiving apparatus 12 further includes a first spread spectrum receiver 127 and a video decoding module 128;
the first spread spectrum receiver 127 is respectively connected to the fourth sampling rate varying module 126 and the second data receiving module 122, and is configured to convert the first digital spread spectrum modulation sequence into forward auxiliary data, and send the forward auxiliary data to the second data receiving module 122;
the video decoding module 128 is respectively connected to the third sampling rate changing module 125 and the second data receiving module 122, and is configured to perform decoding processing on the digital video data, and send the decoded digital video data to the second data receiving module 122.
As shown in fig. 7, in order for the video receiving apparatus to be able to receive the video data and the forward ancillary data transmitted by the video transmitting apparatus, a first spread spectrum receiver and a video decoding module are provided in the video receiving apparatus. The first spread spectrum receiver is for receiving forward ancillary data and the video decoding module is for receiving video data.
Specifically, the first spread spectrum receiver is respectively connected with the fourth sampling rate change module and the second data receiving module, a first digital spread spectrum modulation sequence generated by the fourth sampling rate change module is output to the first spread spectrum receiver, and the first spread spectrum receiver is used for converting the first digital spread spectrum modulation sequence into forward auxiliary data and sending the forward auxiliary data to the second data receiving module, so that the forward auxiliary data is received. The video decoding module is respectively connected with the third sampling rate change module and the second data receiving module, digital video data generated by the third sampling rate change module are output to the video decoding module, and the video decoding module decodes the digital video data and sends the digital video data to the second data receiving module, so that the video data are received.
Example 8:
in order to implement analog data format transmission of the reverse auxiliary data sent by the video receiving device to the video sending device, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 8, the video receiving device 12 further includes a second digital-to-analog converter 129; the video transmission apparatus further includes a second analog-to-digital converter 119;
the second digital-to-analog converter 129 is connected to the second spread spectrum transmitter 121 and the second analog-to-digital converter 119, respectively, and is configured to convert the second spread spectrum modulation sequence into a second analog spread spectrum modulation sequence and send the second analog spread spectrum modulation sequence to the second analog-to-digital converter;
the second analog-to-digital converter 119 is further connected to the first data receiving module 113, and is configured to convert the second analog spread spectrum modulation sequence into a second digital spread spectrum modulation sequence, and send the second digital spread spectrum modulation sequence to the first data receiving module.
As shown in fig. 8, in the data transmission system provided in the embodiment of the present invention, the video receiving apparatus 11 further includes a second digital-to-analog converter 129; the video transmission device 11 further includes a second analog-to-digital converter 119. The second spread spectrum modulation sequence sent by the second spread spectrum transmitter 121 is data in a digital format, and the second digital-to-analog converter 129 is connected to the second spread spectrum transmitter 121 and is configured to convert the second spread spectrum modulation sequence in the digital format into a second analog spread spectrum modulation sequence, and then send the second analog spread spectrum modulation sequence in the analog format to the video sending device, so as to implement analog data format transmission of the reverse auxiliary data. The video transmitting device includes a second analog-to-digital converter, the second analog-to-digital converter 119 is respectively connected to the second digital-to-analog converter 129 and the first data receiving module 113, and the second analog-to-digital converter converts the received analog data into digital data, that is, converts the second analog spreading modulation sequence into a second digital spreading modulation sequence, and transmits the second digital spreading modulation sequence to the first data receiving module.
Example 9:
in order to reduce noise interference, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 9, the video receiving apparatus further includes a second transmitting analog filter 1210;
the second transmit analog filter 1210 is respectively connected to the second digital-to-analog converter 129 and the second analog-to-digital converter 119, and is configured to perform third filtering processing on the second analog spread spectrum modulation sequence, and send the second analog spread spectrum modulation sequence after the third filtering processing to the second analog-to-digital converter.
As shown in fig. 9, the video receiving apparatus further includes a second transmitting analog filter 118 connected to the second digital-to-analog converter and the second analog-to-digital converter, respectively. Wherein the second transmit analog filter may be a low pass filter, an anti-aliasing filter, or the like. The second transmit analog filter may perform preliminary noise filtering on the second analog spreading modulation sequence.
In addition, to further mitigate noise interference, the video transmission apparatus further includes a second reception analog filter 1110;
the second receiving analog filter 1110 is respectively connected to the second transmitting analog filter 1210 and the second analog-to-digital converter 119, and is configured to perform fourth filtering processing on the second analog spread spectrum modulation sequence after the third filtering processing, and send the second analog spread spectrum modulation sequence after the fourth filtering processing to the second analog-to-digital converter.
As shown in fig. 9, the video transmitting apparatus further includes a second receiving analog filter, which is respectively connected to the second transmitting analog filter and the second analog-to-digital converter, and is configured to perform a fourth filtering process on the third filtered second analog spread spectrum modulation sequence, so as to further reduce noise interference, and then transmit the fourth filtered second analog spread spectrum modulation sequence to the second analog-to-digital converter.
In the embodiment of the invention, in the video receiving equipment, the noise is primarily filtered through the second transmitting analog filter, and in the video transmitting equipment, the residual noise is filtered again through the second receiving analog filter, so that the noise interference is further reduced, and the quality of transmitting the second analog spread spectrum modulation sequence is ensured.
Example 10:
in order to filter out the out-of-band information and the sampling rate conversion of the second digital spread spectrum modulation sequence, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 10, the video transmitting apparatus further includes a resampling filter 1111;
the resampling filter 1111 is respectively connected to the second analog-to-digital converter 119 and the first data receiving module 113, and is configured to perform fifth filtering processing and sampling rate conversion processing on the second digital spread spectrum modulation sequence to obtain a third digital spread spectrum modulation sequence, and send the third digital spread spectrum modulation sequence to the first data receiving module.
In the embodiment of the invention, the resampling filter performs fifth filtering processing on the second digital spread spectrum modulation sequence to filter out-of-band information of the second digital spread spectrum modulation sequence, and further ensures the quality of the second digital spread spectrum modulation sequence. The third digital spread spectrum modulation sequence is then transmitted to the first data receiving module.
Example 11:
in order to implement the reception of the reverse auxiliary data, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 11, the video transmitting apparatus further includes a second spread spectrum receiver 1112;
the second spread spectrum receiver 1112 is connected to the resampling filter 1111 and the first data receiving module 113, respectively, and is configured to convert the third digital spread spectrum modulation sequence into reverse auxiliary data, and send the reverse auxiliary data to the first data receiving module.
As shown in fig. 11, the video transmitting apparatus is provided with a second spread spectrum receiver in order to be able to receive the reverse ancillary data transmitted by the video receiving apparatus. The first spread spectrum receiver is for receiving reverse ancillary data.
Specifically, the second spread spectrum receiver is respectively connected with the resampling filter and the first data receiving module, a third digital spread spectrum modulation sequence generated by the resampling filter is output to the second spread spectrum receiver, and the second spread spectrum receiver is used for converting the third digital spread spectrum modulation sequence into reverse auxiliary data and sending the reverse auxiliary data to the first data receiving module, so that the reverse auxiliary data is received.
Example 12:
in order to ensure the normal operation of the data transmission system, on the basis of the above embodiments, in the embodiment of the present invention, as shown in fig. 12, the system further includes a coupling connection unit 13;
the coupling unit 13 is connected to the video transmitting device 11 and the video receiving device 12, respectively, and is configured to couple data transmitted between the video transmitting device and the video receiving device.
By providing the coupling connection unit 13 between the video transmitting device 11 and the video receiving device 12, the data transmission between the video transmitting device and the video receiving device can be coupled, and in the embodiment of the present invention, the video transmitting device 11 and the video receiving device 12 realize the data transmission by means of data coupling.
The system further comprises a control unit 14;
the control unit 14 is connected to the video transmitting device 11 and the video receiving device 12, respectively, and is configured to configure relevant parameters for the video transmitting device and the video receiving device.
The video sending device 11 and the video receiving device 12 both include a plurality of data processing modules, the operation of each module requires parameter configuration in advance, and the control unit in the data transmission system configures the relevant parameters for each data processing module, thereby ensuring that each data processing module works normally.
The system further comprises a clock unit 15;
the clock unit 15 is connected to the video transmitting device 11 and the video receiving device 12, respectively, and is configured to configure operating clocks for the video transmitting device and the video receiving device.
In the data processing and transmission process among the modules of the data transmission system, there is a requirement of time sequence, and the clock unit in the data transmission system configures the working clock of each module of the data processing, thereby ensuring that each module of the data processing works normally.
In addition, in the embodiment of the present invention, the first spreading modulation sequence and the second spreading modulation sequence occupy different spreading resources.
In the embodiment of the invention, the spread spectrum signal is superposed on the analog composite video signal, and the transmission of the auxiliary data based on the composite video signal is realized by utilizing the tolerance of the composite analog video system to noise and the strong anti-interference and anti-noise capabilities of the spread spectrum signal. The transmission of the bidirectional auxiliary data is carried out via a spread spectrum signal channel, and the bidirectional links can be distinguished by different Frequency bands (Frequency Division Multiple Access, FDMA), or different Time slices (Frequency Division Multiple Access, TDMA), or different spreading codes (Code Division Multiple Access, CDMA).
In the embodiment of the invention, at a transmitting end of a data transmission system, namely video transmitting equipment, a first spread spectrum transmitter performs spread spectrum processing on forward auxiliary data, and then the forward auxiliary data and the video data are overlapped and transmitted to a receiving end of the data transmission system, namely video receiving equipment, the transmitting end of the data transmission system performs decoding processing on input video data to obtain digital video data, and a first spread spectrum receiver at the receiving end of the data transmission system receives the forward auxiliary data. In the process, the control unit at the transmitting end of the data transmission system controls the energy amplitude of the first spread spectrum modulation sequence within a certain range to ensure that the transmission of the video data is not influenced, and the first spread spectrum modulation sequence has low requirements on the signal-to-noise ratio in the transmission process due to the characteristics of the first spread spectrum modulation sequence, so that the data transmission can be completed with high reliability even if the first spread spectrum modulation sequence is superposed with the video data and has interference of other spread spectrum signals and the energy amplitude of the signal of the first spread spectrum modulation sequence is not high.
In the process, a control unit of the receiving end of the data transmission system controls the energy amplitude of the second spread spectrum modulation sequence to be within a certain range to ensure that the transmission of the video data is not influenced, and the second spread spectrum modulation sequence has low requirements on the signal-to-noise ratio in the transmission process due to the characteristics of the second spread spectrum modulation sequence, even if the video data is superposed and has the interference of other spread spectrum signals and the energy amplitude of the signal of the second spread spectrum modulation sequence is not high, the data transmission can be finished with high reliability.
The data transmission system provided by the embodiment of the invention has three sets of matched sending and receiving modules, which are respectively: the system comprises a video coding module, a video decoding module, a forward auxiliary data spread spectrum transmitter and a forward auxiliary data spread spectrum receiver, and a reverse auxiliary data spread spectrum transmitter and a reverse auxiliary data spread spectrum receiver, wherein the video coding module, the forward auxiliary data spread spectrum transmitter and the reverse auxiliary data spread spectrum receiver are arranged at a transmitting end of a data transmission system, and the video decoding module, the forward auxiliary data spread spectrum receiver and the reverse auxiliary data spread spectrum transmitter are arranged at a receiving end of the data transmission system.
A video link between a video coding module and a video decoding module is consistent with the traditional analog composite video, because of the superposition and coupling of forward and reverse spread spectrum signals, due to the control of energy amplitude, the analog video data is noise, due to the characteristic of the spread spectrum signals, the energy and the frequency spectrum of the spread spectrum signals can be expanded into a wider frequency band, the noise has small influence in the frequency band of the analog video data, meanwhile, a receiving link of the analog video data has certain tolerance to the noise and can generally reach 20-30 mV, and therefore, the transmission of the analog video data is not influenced by the bidirectional spread spectrum signals.
The forward auxiliary data spread spectrum transmitting and receiving chain circuit and the reverse auxiliary data spread spectrum transmitting and receiving chain circuit have no difference in principle, and the same subsystem can be instantiated. In order to control the effect on the analog video data, it is necessary to limit the amplitude of the energy of the transmitted spread spectrum signal at the respective spread spectrum transmitter. Meanwhile, to avoid collision between forward and reverse directions, the respective embodiments can be handled according to CDMA schemes with different spreading codes in forward and reverse directions, FDMA schemes with different spreading modulation frequency bands in forward and reverse directions, and TDMA schemes with different time slice transmissions in forward and reverse directions.
Because the requirements of the spread spectrum communication system on the signal to noise ratio are low, analog video data and the opposite side can be treated as noise. The local reference pseudo noise code in the spread spectrum receiver has good correlation, and can be compressed into a more concentrated frequency band after the correlation processing of the spread spectrum receiver, and the intermediate frequency filter of the correlator has a very narrow same frequency band, so that the intermediate frequency filter only outputs the intermediate frequency signal modulated with the baseband signal and the power of the interference signal and noise in the same frequency band of the filter, and most of the power of the interference signal and noise can be filtered by the intermediate frequency filter, thereby greatly improving the output signal-to-noise ratio and achieving the purpose of reliable transmission.
Fig. 13 is a flowchart of a video sending apparatus sending video data and forward auxiliary data according to an embodiment of the present invention, where the flowchart illustrates the following:
1) the input digital video data is subjected to video coding processing, and then a video data stream in a digital format is output;
2) the input forward auxiliary data is processed by a spread spectrum transmitter to output a spread spectrum modulation sequence in a digital format;
3) the video data stream in the digital format is subjected to sampling rate conversion, and the video data stream in the digital format meeting the requirement of a target sampling rate is output;
4) the spread spectrum modulation sequence in the digital format is converted by the sampling rate, and the spread spectrum modulation sequence data stream in the digital format meeting the requirement of the target sampling rate is output;
5) superposing the data streams output by the 3) and the 4) to output a data stream mixed with the video and the forward auxiliary data after the spread spectrum;
6) the data stream output in the step 5) is subjected to digital-to-analog conversion to output an analog signal;
7) the analog signal of the 6) is subjected to analog filtering processing to filter out-of-band noise and image frequency points of analog-to-digital conversion;
8) the filtered analog signal output by the above 7) is the signal to be transmitted, and the reverse data receiving link is coupled in physical hardware.
Fig. 14 is a flowchart of a video transmitting apparatus receiving reverse auxiliary data according to an embodiment of the present invention, where the flowchart illustrates the following:
1) the reverse auxiliary data transmitting end, namely an analog signal transmitted by the video receiving equipment enters a reverse auxiliary data receiving link through coupling connection;
2) carrying out analog filtering processing on the analog signals to filter out-of-band noise;
3) carrying out analog-digital conversion on the filtered analog signal and outputting a data stream in a digital format;
4) the spread spectrum receiver performs processing such as despreading, synchronous demodulation and the like on the data stream in the digital format to obtain reverse auxiliary data.
It should be noted that the reason why the spread spectrum receiver on the reverse coupled data receiving link can still demodulate the reverse auxiliary data when the forward data is coupled is as follows:
the spread spectrum transmitter of the reverse auxiliary data takes the reverse auxiliary data as an information signal to be transmitted, and the reverse auxiliary data is spread and spliced into a broadband signal by using a preset spread spectrum function (irrelevant to the information signal to be transmitted), and then the broadband signal is transmitted through an analog video channel; at the receiving end of the reverse auxiliary data, the spread spectrum receiver compresses the spread spectrum by using corresponding technical means, and restores the expanded spectrum to the bandwidth of the original information signal to be transmitted, thereby improving the output signal quality of the information signal to be transmitted, while the forward composite video signal can be regarded as a local noise signal, because the received spread spectrum signal of the reverse auxiliary data has good correlation with a local reference pseudo noise code in the spread spectrum receiver, and after the correlation processing of the spread spectrum receiver, the spread spectrum signal can be compressed into a more concentrated frequency band, and the intermediate frequency filter of the correlator has a very narrow same frequency band, so the intermediate frequency filter only outputs the power of the intermediate frequency signal modulated with the baseband signal and the part of interference signals and noise falling in the filter band, and most of the power of the interference signals and noise can be filtered by the intermediate frequency filter, this greatly improves the output signal-to-noise ratio. While the forward attachment data is also coupled to the receive chain of the reverse attachment data, the solution for the different embodiments will be different, and the three types can be summarized: (A) configuring, by the control unit, a spreading code of forward ancillary data and a spreading code of reverse ancillary data to different spreading codes, i.e., a CDMA scheme; (B) configuring, by the control unit, a carrier of forward direction supplementary data and a carrier of reverse direction supplementary data to different carrier frequencies, i.e., FDMA scheme; (C) the forward and reverse attachment data are transmitted by the control unit in different time periods, i.e. TDMA scheme.
Fig. 15 is a flowchart of a video receiving apparatus receiving video data and forward auxiliary data according to an embodiment of the present invention, where the flowchart illustrates the following:
1) the video data and the analog signal transmitted by the forward auxiliary data transmitting end, namely the video transmitting equipment enter the receiving link through the coupling connection;
2) carrying out analog filtering processing on the analog signals to filter out-of-band noise;
3) carrying out analog-digital conversion on the filtered analog signal and outputting a data stream in a digital format;
4) performing sampling rate conversion on the digital data stream output by the 3), wherein the target sampling rate is a sampling rate suitable for processing by a spread spectrum receiver;
5) the spread spectrum receiver carries out processing such as despreading, synchronous demodulation and the like on the data stream in the digital format in the step 4) to obtain reverse auxiliary data;
6) performing sampling rate conversion on the digital data stream output by the step 3), wherein the target sampling rate is a sampling rate suitable for video decoding processing;
7) and the composite video decoding module performs video decoding and other processing on the data stream in the digital format in the step 4) to obtain digital video image data.
The reason why the spread spectrum receiver on the forward auxiliary data receiving link can still demodulate the forward auxiliary data when the reverse data and the composite video data are coupled is similar to the situation of the reverse auxiliary data receiving link, and is not described herein again.
Fig. 16 is a flowchart of a video receiving device sending reverse auxiliary data according to an embodiment of the present invention, where the flowchart illustrates the following:
1) the input reverse auxiliary data is processed by a spread spectrum transmitter to output a spread spectrum modulation sequence in a digital format;
2) the spread spectrum modulation sequence in the digital format is converted by the sampling rate, and the spread spectrum modulation sequence data stream in the digital format meeting the requirement of the target sampling rate is output;
3) the data stream output in the step 2) is subjected to digital-to-analog conversion, and an analog signal is output;
4) the analog signal of the 3) is subjected to analog filtering to filter out-of-band noise and DAC image frequency points;
5) 44) is a signal to be transmitted, and the reverse data receiving link is coupled in physical hardware.
An embodiment of the present invention provides a data transmission system, where the system includes: a video transmitting device and a video receiving device; the video sending equipment comprises a first spread spectrum transmitter, a superposition module and a first data receiving module; the video receiving device comprises a second spread spectrum transmitter and a second data receiving module; the first spread spectrum transmitter is connected with the superposition module and used for converting forward auxiliary data into a first spread spectrum modulation sequence and transmitting the first spread spectrum modulation sequence to the superposition module; the superposition module is connected with the second data receiving module and used for carrying out superposition processing on the first spread spectrum modulation sequence and the video data to be superposed and sending the video data to the second data receiving module; the second spread spectrum transmitter is connected with the first data receiving module, and is configured to convert the reverse ancillary data into a second spread spectrum modulation sequence, and send the second spread spectrum modulation sequence to the first data receiving module.
In the embodiment of the invention, the video sending device converts the forward auxiliary data into the first spread spectrum modulation sequence through the first spread spectrum transmitter, and the superposition module superposes the first spread spectrum modulation sequence and the video data to be superposed and sends the superposed video data to the second data receiving module in the video receiving device. The video receiving device converts the reverse auxiliary data into a second spread spectrum modulation sequence through a second spread spectrum transmitter and sends the second spread spectrum modulation sequence to a first data receiving module in the video sending device. The embodiment of the invention can realize the collinear transmission of the video data and the bidirectional auxiliary data, simultaneously can give consideration to the compatibility of the original video data transmission system, can maximally utilize equipment in the original video data transmission system, and effectively reduces the system cost.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (14)

1. A data transmission system, the system comprising: a video transmitting device and a video receiving device; the video sending equipment comprises a first spread spectrum transmitter, a superposition module and a first data receiving module; the video receiving device comprises a second spread spectrum transmitter and a second data receiving module;
the first spread spectrum transmitter is connected with the superposition module and used for converting forward auxiliary data into a first spread spectrum modulation sequence and transmitting the first spread spectrum modulation sequence to the superposition module;
the superposition module is connected with the second data receiving module and used for carrying out superposition processing on the first spread spectrum modulation sequence and the video data to be superposed and sending the video data to the second data receiving module;
the second spread spectrum transmitter is connected with the first data receiving module, and is used for converting reverse auxiliary data into a second spread spectrum modulation sequence and transmitting the second spread spectrum modulation sequence to the first data receiving module;
the video transmitting device further comprises a video encoding module;
the video coding module is connected with the superposition module and used for coding original video data into composite video data in a digital format to obtain video data to be superposed and sending the video data to the superposition module;
the video sending equipment further comprises a first sampling rate change module and a second sampling rate change module; wherein the output sampling rates of the first sampling rate change module and the second sampling rate change module are the same;
the first sampling rate change module is respectively connected with the video coding module and the superposition module and is used for carrying out sampling rate conversion processing on the video data to be superposed, which is sent by the video coding module, and sending the video data to be superposed, which is subjected to the sampling rate conversion processing, to the superposition module;
the second sampling rate change module is respectively connected with the first spread spectrum transmitter and the superposition module, and is used for performing sampling rate conversion processing on a first spread spectrum modulation sequence sent by the first spread spectrum transmitter and sending the first spread spectrum modulation sequence subjected to the sampling rate conversion processing to the superposition module;
and the spread spectrum resources occupied by the first spread spectrum modulation sequence and the second spread spectrum modulation sequence are different.
2. The system of claim 1, wherein the video transmission device further comprises a first digital-to-analog converter; the video receiving device further comprises a first analog-to-digital converter;
the first digital-to-analog converter is respectively connected with the superposition module and the first analog-to-digital converter, and is used for converting data subjected to superposition processing into analog data and sending the analog data to the first analog-to-digital converter;
the first analog-to-digital converter is also connected with the second data receiving module and used for converting the analog data into digital data and sending the digital data to the second data receiving module.
3. The system of claim 2, wherein the video transmission device further comprises a first transmit analog filter;
the first transmit analog filter is respectively connected with the first digital-to-analog converter and the first analog-to-digital converter, and is configured to perform first filtering processing on the analog data and send the analog data after the first filtering processing to the first analog-to-digital converter.
4. The system of claim 3, wherein the video receiving device further comprises a first receive analog filter;
the first receiving analog filter is respectively connected with the first transmitting analog filter and the first analog-to-digital converter, and is used for performing second filtering processing on the analog data after the first filtering processing and sending the analog data after the second filtering processing to the first analog-to-digital converter.
5. The system of claim 2, wherein the video receiving device further comprises a third sample rate change module and a fourth sample rate change module;
the third sampling rate change module and the fourth sampling rate change module are respectively connected with the first analog-to-digital converter and the second data receiving module;
the third sampling rate change module is used for performing sampling rate conversion processing on the digital data to obtain digital video data and sending the digital video data to the second data receiving module; wherein an output sampling rate of the third sampling rate change module is the same as an input sampling rate of the first sampling rate change module;
the fourth sampling rate change module is configured to perform sampling rate conversion processing on the digital data to obtain a first digital spread spectrum modulation sequence, and send the first digital spread spectrum modulation sequence to the second data receiving module; wherein an output sampling rate of the fourth sampling rate change module is the same as an input sampling rate of the second sampling rate change module.
6. The system of claim 5, wherein the video receiving device further comprises a first spread spectrum receiver and a video decoding module;
the first spread spectrum receiver is respectively connected with the fourth sampling rate changing module and the second data receiving module, and is used for converting the first digital spread spectrum modulation sequence into forward auxiliary data and sending the forward auxiliary data to the second data receiving module;
the video decoding module is respectively connected with the third sampling rate change module and the second data receiving module, and is used for decoding the digital video data and sending the decoded digital video data to the second data receiving module.
7. The system of claim 1, wherein the video receiving device further comprises a second digital-to-analog converter; the video transmitting device further comprises a second analog-to-digital converter;
the second digital-to-analog converter is respectively connected with the second spread spectrum transmitter and the second analog-to-digital converter, and is configured to convert the second spread spectrum modulation sequence into a second analog spread spectrum modulation sequence and send the second analog spread spectrum modulation sequence to the second analog-to-digital converter;
the second analog-to-digital converter is further connected to the first data receiving module, and is configured to convert the second analog spread spectrum modulation sequence into a second digital spread spectrum modulation sequence, and send the second digital spread spectrum modulation sequence to the first data receiving module.
8. The system of claim 7, wherein the video receiving device further comprises a second transmit analog filter;
the second transmitting analog filter is respectively connected with the second digital-to-analog converter and the second analog-to-digital converter, and is configured to perform third filtering processing on the second analog spread spectrum modulation sequence, and send the second analog spread spectrum modulation sequence after the third filtering processing to the second analog-to-digital converter.
9. The system of claim 8, wherein the video transmission device further comprises a second receive analog filter;
the second receiving analog filter is respectively connected with the second transmitting analog filter and the second analog-to-digital converter, and is configured to perform fourth filtering processing on the third filtered second analog spread spectrum modulation sequence, and send the fourth filtered second analog spread spectrum modulation sequence to the second analog-to-digital converter.
10. The system of claim 9, wherein the video transmission device further comprises a resampling filter;
the resampling filter is respectively connected with the second analog-to-digital converter and the first data receiving module, and is configured to perform fifth filtering processing and sampling rate conversion processing on the second digital spread spectrum modulation sequence to obtain a third digital spread spectrum modulation sequence, and send the third digital spread spectrum modulation sequence to the first data receiving module.
11. The system of claim 10, wherein said video transmitting device further comprises a second spread spectrum receiver;
the second spread spectrum receiver is respectively connected with the resampling filter and the first data receiving module, and is configured to convert the third digital spread spectrum modulation sequence into reverse auxiliary data, and send the reverse auxiliary data to the first data receiving module.
12. The system of any one of claims 1 to 11, wherein the system further comprises a coupling connection unit;
the coupling connection unit is respectively connected with the video sending device and the video receiving device and is used for coupling data transmitted between the video sending device and the video receiving device.
13. The system of any one of claims 1 to 11, further comprising a control unit;
the control unit is respectively connected with the video sending equipment and the video receiving equipment and is used for configuring relevant parameters for the video sending equipment and the video receiving equipment.
14. The system of any one of claims 1 to 11, wherein the system further comprises a clock unit;
the clock unit is respectively connected with the video transmitting equipment and the video receiving equipment and is used for configuring working clocks for the video transmitting equipment and the video receiving equipment.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1193242A (en) * 1996-10-22 1998-09-16 索尼公司 Video-frequency duplication control system and video frequency signal reproducing and recording apparatus thereof
CN1211874A (en) * 1997-06-17 1999-03-24 索尼公司 Information signal processing unit
US7178157B1 (en) * 1999-11-17 2007-02-13 Sony Corporation Information transmission system, information output apparatus, information input apparatus, and connection relationship identification method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1193242A (en) * 1996-10-22 1998-09-16 索尼公司 Video-frequency duplication control system and video frequency signal reproducing and recording apparatus thereof
CN1211874A (en) * 1997-06-17 1999-03-24 索尼公司 Information signal processing unit
US7178157B1 (en) * 1999-11-17 2007-02-13 Sony Corporation Information transmission system, information output apparatus, information input apparatus, and connection relationship identification method

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