CN116347151A - HDMI self-adaptive video interference device - Google Patents
HDMI self-adaptive video interference device Download PDFInfo
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- CN116347151A CN116347151A CN202310619348.8A CN202310619348A CN116347151A CN 116347151 A CN116347151 A CN 116347151A CN 202310619348 A CN202310619348 A CN 202310619348A CN 116347151 A CN116347151 A CN 116347151A
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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]
- H04N21/40—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
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
- H04N21/43632—Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wired protocol, e.g. IEEE 1394
- H04N21/43635—HDMI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/20—Countermeasures against jamming
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the field of information security, and particularly relates to HDMI self-adaptive video interference equipment. The HDMI self-adaptive video interference device disclosed by the invention comprises: the device comprises an HDMI input interface, an HDMI output interface, a jammer and a signal output end; the HDMI input interface is electrically connected with the HDMI output interface; a plurality of pins of the HDMI output interface are connected with the voltage signal input end of the interference device; the signal output end comprises an antenna interface; the output end pin of the interference device is connected with the pin of the antenna interface; the jammer generates a noise signal based on the change of the input voltage signal, and the noise signal is modulated and then output to the signal output end. The HDMI self-adaptive video interference device provided by the invention can realize the protection of signals in an indoor environment.
Description
Technical Field
The invention belongs to the field of information security, and particularly relates to HDMI self-adaptive video interference equipment.
Background
With the rapid development of electronic information technology, information equipment is increasingly widely applied to various industries. But information devices have problems with electromagnetic leakage to varying degrees. Electromagnetic leakage refers to the outward diffusion of stray (parasitic) electromagnetic energy of an electronic device through a wire or space. Any electromagnetic information device in an operating state has electromagnetic leakage with different degrees, which is an electromagnetic phenomenon that cannot be removed. If these leaks "entrain" information handled by the device, so-called electromagnetic information leaks are constituted. On the premise of meeting certain conditions, the information can be received and restored by using a specific instrument. Thus, once the information involved is kept secret, such leakage threatens the information security. The data show that: the electromagnetic wave with information radiated by the common computer display terminal can be received and reproduced in tens of meters or even hundreds of meters; the technology for receiving and recovering electromagnetic leakage information is now a means for stealing important information of other countries by many national information institutions.
The HDMI transmission line is a fully digital video and audio transmission interface capable of transmitting uncompressed audio signals and video signals. It is an indispensable transmission line (CABLE) for set-top boxes, DVD players, personal computers, video game machines, synthesis expanders, digital audio and televisions, etc. The audio and video signals can be transmitted simultaneously, and the same cable is adopted for the audio and video signals, so that the installation difficulty of the system is greatly simplified.
Through research experiments, when information equipment such as a computer and the like works normally, the electromagnetic leakage intensity of the video cable is high, and the video information electromagnetic signals leaked by the video cable can be easily received and restored, so that the risk is high. At present, most of information devices support and use an HDMI cable (high-definition multimedia interface cable), so that a corresponding HDMI adaptive video jammer needs to be developed for the HDMI cable for protection.
Referring to Table 1, the HDMI bus includes pins 1-19, wherein pin 1 is TMDS data 2+, pin 3 is TMDS data 2-, pin 4 is TMDS data 1+, pin 6 is TMDS data 1-, pin 7 is TMDS data 0+, pin 9 is TMDS data 0-, pin 10 is TMDS data clock clk+, and pin 12 is TMDS clock clk-.
Table 1 HDMI signal pin definitions
When a common HDMI transmission line transmits signals, electromagnetic signals can be leaked, HDMI signals can be received through a software defined radio SDR (Software Defined Radio), and the existing partial monitoring device can realize monitoring within a range of 5 meters and recovery of 28 pounds words under 1080p resolution.
Disclosure of Invention
The invention aims to solve the problem of at least one HMDI signal leakage, provides a solution for HDMI signal leakage at a user side, and reduces the complexity of information security.
According to a first aspect of the present invention, there is provided an HDMI adaptive video jamming device comprising an HDMI input interface, an HDMI output interface, a jammer and a signal output;
the HDMI input interface is electrically connected with the HDMI output interface;
a plurality of pins of the HDMI output interface are connected with the voltage signal input end of the interference device;
the signal output end comprises an antenna interface;
the output end pin of the interference device is connected with the pin of the antenna interface;
the jammer generates a noise signal based on the change of the input voltage signal, and the noise signal is modulated and then output to the signal output end.
According to one embodiment of the present invention, the disrupter is connected to the HOTPLUG pin of the HDMI output interface, and the disrupter is further electrically connected to at least one set of TMDS pins in the HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, and the duration of each group of white noise signals is 0.005-0.03s;
the jammer generates a plurality of groups of second white noise signals according to voltage changes of at least one group of TMDS pins in the HDMI output interface.
According to one embodiment of the invention, the disruptor is electrically connected to the HOTPLUG pin and the clock pin of the HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, and the duration of each group of white noise signals is 0.005-0.03s;
the jammer generates a plurality of groups of second white noise signals according to the voltage change of the clock pin.
According to one embodiment of the present invention, the jammer is connected to the HOTPLUG pin of the HDMI output interface, and the jammer is further electrically connected to three sets of TMDS pins in the HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, and the duration of each group of white noise signals is 0.005-0.03s;
and the jammer generates a plurality of groups of second white noise signals according to the voltage changes of the three groups of TMDS pins in the HDMI output interface.
According to one embodiment of the invention, the jammer is tuned to generate a plurality of groups of white noise signals when at least one pin voltage of three groups of TMDS of the HDMI output interface changes, and the duration of each group of white noise signals is 1-5 times of the clock length.
According to one embodiment of the present invention, the jammer is connected to the HOTPLUG pin of the HDMI output interface, and the jammer is tuned to generate a plurality of sets of white noise signals when the HOTPLUG goes high, each set of white noise signals having a duration of 0.005-0.03s.
According to one embodiment of the invention, the noise signal comprises a base noise signal and a dynamic noise signal.
The invention has the following beneficial effects:
(1) The demand for signal lines is reduced, and leakage of signals is prevented by a noise-forming method;
(2) Noise can be output according to clock variation or signal variation, and the signal generation mode is flexible and various;
(3) Multiple groups of irregular noise related to signals can be formed, so that sniffing is prevented;
(4) Related interference can be realized according to video parameters and leakage information characteristics;
(5) The power supply can be selected according to the requirement, such as 5V power supply of a Type-C interface and power supply of a DC direct current adapter;
(6) The emission intensity is controllable, the electromagnetic compatibility is good, and the display effect of the display can not be influenced.
Drawings
Fig. 1 is a schematic diagram of connection relationship between an HDMI adaptive video interference device and a video device according to the present invention;
fig. 2 is a schematic diagram of signal connection relationship between an HDMI adaptive video interference device and a video device according to the present invention;
fig. 3 is a schematic diagram of an interference mechanism of an HDMI adaptive video interference device in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of an interference mechanism of an HDMI adaptive video interference device in embodiment 2 of the present invention;
fig. 5 is a schematic diagram of an interference mechanism of an HDMI adaptive video interference device in embodiment 3 of the present invention;
fig. 6 is a schematic diagram of an interference mechanism of an HDMI adaptive video interference device in embodiment 4 of the present invention;
fig. 7 is a schematic diagram of an interference mechanism of an HDMI adaptive video interference device in embodiment 5 of the present invention;
fig. 8 is a schematic diagram of an interference mechanism of an HDMI adaptive video interference device in embodiment 8 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, an HDMI adaptive video jamming device includes an HDMI input interface (HDMI 1), an HDMI output interface (HDMI 2), a jammer, and a signal output terminal;
the HDMI input interface is electrically connected with the HDMI output interface;
a plurality of pins of the HDMI output interface are connected with the voltage signal input end of the interference device;
the signal output end comprises an antenna interface;
the output end pin of the interference device is connected with the pin of the antenna interface;
the jammer generates a noise signal based on the change of the input voltage signal, and the noise signal is modulated and then output to the signal output end.
The power input in fig. 2 may also be power supplied through the USB of the computer, hereinafter always the default device is connected to a dc power supply, an ac power supply-converter to provide a working environment.
In the following embodiment, for monitoring leakage of HDMI interface signals by RTL-SDR software, specific implementation can be referred to as "https:// www.rtl-sdr.com/RTL-SDR-quick-start-guide/", and the tuner used is Elonics E4000, which provides a receiving range of 52-2200 MHz.
Monitoring of the specific frequency may be achieved by the software and hardware described above, wherein the selection of the specific frequency is determined based on the selection of the maximum relevant frequency.
The leakage test of the response signal is performed by using the following manner, specifically using an HDMI2.1 data line, wherein the transverse distance between the HDMI and the adjacent USB3.0 interface is 2.1cm, the refresh rate of the computer is set to be 30Hz, the display image is a vertical stripe, the width of the stripe is 60 pixels, and the leakage of the signal is measured by using RTL-SDR, and the software is used for determining:
(1) Monitoring the strongest signal at the interface of the HDMI cable and the computer;
(2) The variation of the signal at the highest intensity signal receiving frequency F (398.1 MHz) is consistent with the output of the signal;
(3) Setting the receiving frequency as F, setting a receiving antenna to be clung to an HDMI data line, and distinguishing the received signals by a degree that the received signals are more noisy than the received signals at an interface;
(4) Setting the receiving frequency as F, setting the receiving position as a USB interface adjacent to the HDMI output interface, and enabling the received signal to be close to the condition (2);
(5) Using the condition consistent with the condition (2), when the step length of the non-shielding space measurement distance HDMI interface on the same horizontal distance is 0.5m, the maximum distance of the picture missing identifiable degree, obtaining the maximum visible leakage distance R1 of the non-shielding space, obtaining the R1 distance of 5.5m, and still obtaining the distance of an image similar to a vertical stripe by denoising through an algorithm of 30m;
(6) By setting the receiver position at the USB interface adjacent to the HDMI output interface using the conditions consistent with those in condition (2), and setting the presentation image as a longitudinal stripe of interlaced display (stripe width of 60 pixels, every 50ms, a dot of pixel RBG value of 0x000000 in the stripe is replaced with a white dot of 0 xffffff), flickering at an approximate frequency can be observed at the software side.
Based on the above assumption and verification of HDMI data leakage, the feasibility of the scheme of the invention is verified on the basis, and the device is used for signal protection of computers in offices, projectors, large-screen displays of SM meeting rooms and the like.
Example 1
Referring to fig. 1 and 2, an HDMI adaptive video jamming device includes an HDMI input interface, an HDMI output interface, a jammer, and a signal output terminal; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, the pin 1, the pin 3 and the pin 19 of the HDMI output interface are configured to be connected with the input end of the jammer, and the input end of the jammer is connected with the pins and respectively measures the change of the voltage of the jammer.
The self-adaptive video interference equipment is powered after converting alternating current into direct current. After the whole device is powered on and is not abnormal, a signal for preparing OK is sent to a signal source end, a guide signal HOT PLUG of a received HDMI signal is pulled down and pulled up again, after the signal source end receives the signal, handshake is carried out with a display end through a communication protocol, if no abnormality exists, the signal source end sends the HDMI signal to the display end, and otherwise the HDMI signal is not sent.
The interference device comprises a signal generator, a sampling interval is set to be consistent with the signal period of the HDMI output interface, the communication protocol is serial port instructions, a module frequency output range of 35MHz-4.4GHz is provided, the frequency control step is 0.1MHz, and the strength of signals is further increased through an antenna.
The 19 # pin voltage of the HDMI output interface can be used for judging whether a cable is inserted into the HDMI output interface, when the cable is connected with a signal cable, an interference process can be started, and the signal cable is used for outputting 3 groups of substrate interference signals, wherein the first group of substrate interference signals generate 60 groups per second, and the duration of each group is 0.012 seconds; the second set of substrate interference signals produces 75 sets per second, each set having a duration of 0.01 seconds; the third set of substrate interference signals produces 120 sets per second, each set having a duration of 0.01 seconds. The three aforementioned groups of base signals are generated as a whole to cover the usual screen refresh rates of 30, 60 and 120 Hz.
The first interference signal comprises 3 groups of interference signals, and a pin 1 and a pin 3 of the HDMI output interface are data ports of TMDS, and can track signal transmission based on voltage change.
The present invention uses the voltage variation of 3 TMDS data channels and 1 TMDS clock channel included in one HDMI interface to protect user information, and in this embodiment, 1 data channel is used, which may also be TMDS1 or TMDS3.
TMDS is a differential signaling mechanism, and adopts a differential transmission mode. TMDS differential transmission is a technique that uses a voltage difference between 2 pins to transmit signals. The value of the transmission data is determined by the positive and negative polarities and the magnitude of the voltage between the two pins, and the original signal and the signal opposite to the original signal are respectively transmitted. Thus, the receiving end can shield electromagnetic interference in a differential mode so as to obtain a correct signal.
A standard HDMI connection includes 3 TMDS transmission channels for transmitting data, and 1 independent TMDS clock channel to ensure uniform timing required during transmission. Each TMDS channel is capable of transmitting 10bit data streams in one clock cycle. During data transmission, when 1 is transmitted, a high voltage is obtained at the pin, which indicates that there is a signal transmission, and the jammer can generate a second interference signal based on the high voltage. The second interference signal is determined according to a data channel of the TMDS, and a random interference signal is generated when a signal transmission process is tracked by the voltage.
Under the condition that the data line is not changed, the output of the computer is connected to the HDMI input interface of the interference device through the HDMI line, the display device is connected to the HDMI output interface of the interference device through the other HDMI line, the radio frequency antenna is connected to the antenna interface of the signal output end, and the test is carried out by adopting the method, so that the following test result is obtained:
(1) At the highest intensity signal reception frequency F (398.1 MHz, which is substantially fixed for the same computer and cable), no identifiable image is obtained at the HMDI input interface and the HDMI output interface of the jammer, indicating no signal leakage at the jammer;
(2) Setting the receiving frequency as F, wherein identifiable images cannot be obtained in USB equipment of a computer;
(3) Setting the receiving frequency as F, wherein the image of the display equipment is not disturbed to be displayed normally;
(4) At a distance of 1m from the jammer, the received image approximates white noise with no obvious regularity.
In order to ensure that the interference of the signals is obtained based on the method of the present invention, an improvement is made in that the generation of the interference signals is not performed based on the voltage variation of the TMDS, and the first interference signals are set to generate 5 groups per second, resulting in the following results:
(1) Monitoring the interface of the strongest signal at the position between the HDMI cable and the computer, and interfering the HDMI input interface and the HDMI output interface of the equipment;
(2) At the highest intensity signal reception frequency F (398.1 MHz), the signal is clear, but there is periodic interference;
(3) Setting the receiving frequency as F, setting a receiving antenna to be closely attached to an HDMI data line connected with an HDMI input interface, wherein the received signal is clear, but periodic interference exists; setting a receiving antenna to be clung to an HDMI data line connected with an HDMI output interface, wherein the received signal is clear, but periodic interference exists;
(4) Setting the receiving frequency as F, setting the receiving position as a USB interface adjacent to the HDMI interface on the computer side, wherein the received signal is close to the condition (2) and periodic interference exists;
(5) When the step length of the non-occlusion space measurement distance HDMI output interface on the same horizontal distance is 0.5m, the maximum distance of the picture missing identifiable degree is obtained, the maximum macroscopic identifiable leakage distance R1 of the non-occlusion space is obtained, the obtained distance R1 is 5.0m, at the moment, an image similar to a vertical stripe can still be obtained through algorithm denoising, but periodic interference exists;
(6) Using the conditions consistent with those in condition (2), setting the receiver position at the USB interface adjacent to the computer HDMI interface, setting the presentation image as a longitudinal stripe of interlaced display (stripe width of 60 pixels, every 50ms, the point of pixel RBG value of 0x000000 in the stripe being replaced with white point of 0 xffffff), it is possible to observe that the software side presents flicker of an approximate frequency, and that there is periodic disturbance.
It was determined from the experiments described above that the interference was generated by an interferer, based on which the above described scheme was altered to obtain a more interfering device implementation.
According to one embodiment of the present invention, the disrupter is connected to the HOTPLUG pin of the HDMI output interface, and the disrupter is further electrically connected to at least one set of TMDS pins in the HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, wherein the duration of each group of white noise signals is 0.005-0.03s, and the white noise signals are determined by random numbers and are not described in detail;
the jammer generates a plurality of groups of second white noise signals according to voltage changes of at least one group of TMDS pins in the HDMI output interface.
Example 2
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The self-adaptive video interference equipment is powered by alternating current, the interference device comprises a signal generator, a sampling interval is set to be consistent with the signal period of the HDMI output interface, the communication protocol is a serial port instruction, a module frequency output range of 35MHz-4.4GHz is provided, the frequency control step is 0.1MHz, and the output frequency is 390.2MHz.
The 19 # pin voltage of the HDMI bus port can be used for judging whether a cable is inserted into an HDMI output interface, and when the cable is connected with a signal cable, an interference process can be started and used for outputting 3 groups of substrate interference signals, wherein 144 groups of substrate interference signals are generated per second in a first group, and the duration of each group is 0.00699 seconds; the second set of substrate interference signals produces 60 sets per second, each set having a duration of 0.0166 seconds. The aforementioned base signals are generated as a signal that covers the usual 60 and 144Hz screen refresh rates as a whole.
The jammer is also electrically connected with a TMDS2 pin in the HDMI output interface, and generates a second white noise signal when the voltage of the TMDS2 pin changes.
Example 3
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The self-adaptive video interference equipment is powered by alternating current, the interference device comprises a signal generator, a sampling interval is set to be consistent with the signal period of the HDMI output interface, the communication protocol is a serial port instruction, a module frequency output range of 35MHz-4.4GHz is provided, the frequency control step is 0.1MHz, and the output frequency is 390.2MHz.
The 19 # pin voltage of the HDMI bus port can be used for judging whether a cable is inserted into an HDMI output interface, and when the cable is connected with a signal cable, an interference process can be started and used for outputting 3 groups of substrate interference signals, wherein 144 groups of substrate interference signals are generated per second in a first group, and the duration of each group is 0.00699 seconds; the second set of substrate interference signals produces 60 sets per second, each set having a duration of 0.0166 seconds. The aforementioned base signals are generated as a signal that covers the usual 60 and 144Hz screen refresh rates as a whole.
The jammer is also electrically connected with a clock in the HDMI output interface, and when the voltage of a clock pin changes, the jammer indicates that data is sent, and the jammer generates a second white noise signal so as to form protection for video information.
Example 4
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The self-adaptive video interference equipment is powered by alternating current, the interference device comprises a signal generator, a sampling interval is set to be consistent with the period of an HDMI output interface signal, a communication protocol is a serial port instruction, a module frequency output range of 35MHz-4.4GHz is provided, a frequency control step is 0.1MHz, and the output frequency is 390.2MHz.
The 19 # pin voltage of the HDMI bus port can be used for judging whether a cable is inserted into an HDMI output interface, and when the cable is connected with a signal cable, an interference process can be started and used for outputting 3 groups of substrate interference signals, wherein 144 groups of substrate interference signals are generated per second in a first group, and the duration of each group is 0.00699 seconds; the second set of substrate interference signals produces 60 sets per second, each set having a duration of 0.0166 seconds. The aforementioned base signals are generated as a signal that covers the usual 60 and 144Hz screen refresh rates as a whole.
The jammer is also electrically connected with clocks of three groups of TMDS of the HDMI output interface, when voltage of one pin of two groups of TMDS changes, the voltage indicates that data is sent, and the jammer generates a second white noise signal to form protection for video information.
Example 5
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The self-adaptive video interference equipment is powered by alternating current, the interference device comprises a signal generator, a sampling interval is set to be consistent with the period of an HDMI output interface signal, a communication protocol is a serial port instruction, a module frequency output range of 35MHz-4.4GHz is provided, a frequency control step is 0.1MHz, and the output frequency is 390.2MHz.
The 19 # pin voltage of the HDMI bus port can be used for judging whether a cable is inserted into an HDMI output interface, and when the cable is connected with a signal cable, an interference process can be started and used for outputting 3 groups of substrate interference signals, wherein 144 groups of substrate interference signals are generated per second in a first group, and the duration of each group is 0.00699 seconds; the second set of substrate interference signals produces 60 sets per second, each set having a duration of 0.0166 seconds. The aforementioned base signals are generated as a signal that covers the usual 60 and 144Hz screen refresh rates as a whole.
The jammer is also electrically connected with a pin of TMDS2 in the HDMI output interface, and when the voltage of any TMDS pin changes, the jammer generates a second white noise signal so as to form protection for video information.
Example 6
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The first power input interface of the HDMI self-adaptive video interference device is an AC (alternating current) interface, and voltage is reduced through a transformer built in the device to obtain voltage of 6V.
Example 7
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The first power input interface of the HDMI self-adaptive video interference device is a DC direct current interface, and 220V alternating current is reduced through a conventional transformer to obtain 6V voltage.
Example 8
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The self-adaptive video interference equipment is powered by alternating current, the interference device comprises a signal generator, a sampling interval is set to be consistent with the signal period of the HMDI, a communication protocol is a serial port instruction, a module frequency output range of 35MHz-4.4GHz is provided, the frequency control step is 0.1MHz, and the output frequency is 390.2MHz.
The 19 # pin voltage of the HDMI output interface can be used for judging whether a cable is inserted into the HDMI output interface, when the cable is connected with a signal cable, an interference process can be started, and the signal cable is used for outputting 3 groups of substrate interference signals, wherein 144 groups of substrate interference signals are generated per second in a first group, and the duration of each group is 0.00699 seconds; the second set of substrate interference signals produces 60 sets per second, each set having a duration of 0.0166 seconds. The aforementioned base signal is generated as a signal covering the usual 60 and 144Hz screen refresh rates as a whole to form a protection for video information; this embodiment simplifies the algorithm but requires improvements to the random number algorithm to achieve coverage of signals independent of the video signal output, such as increasing the coverage duration of each set of signals.
Example 9
An HDMI self-adaptive video interference device comprises an HDMI input interface, an HDMI output interface, an interference device and a signal output end; the pins of the HDMI input interface and the HDMI output interface are connected in a one-to-one correspondence in sequence, and the pin 19 of the HDMI output interface is configured to be connected to the input terminal of the jammer, which is connected to the aforementioned pin, and respectively measures the variation of the voltage thereof.
The self-adaptive video interference equipment is powered by alternating current, the interference device comprises a signal generator, a sampling interval is set to be consistent with the signal period of the HMDI, a communication protocol is a serial port instruction, a module frequency output range of 35MHz-4.4GHz is provided, the frequency control step is 0.1MHz, and the output frequency is 390.2MHz.
The 19 # pin voltage of the HDMI bus port can be used for judging whether a cable is inserted into an HDMI output interface, and when a signal cable is accessed, an interference process can be started and used for outputting 3 groups of substrate interference signals, wherein 144 groups of substrate interference signals are generated per second in a first group, and the duration of each group is 0.00699 seconds; the second set of substrate interference signals produces 60 sets per second, each set having a duration of 0.0166 seconds. The aforementioned base signal is generated as a signal covering the usual 60 and 144Hz screen refresh rates as a whole to form a protection for video information; in addition, a second white noise signal is generated in addition to the white noise generated at regular intervals to achieve signal coverage independent of the video signal output.
Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.
Claims (7)
1. The HDMI self-adaptive video interference device is characterized by comprising an HDMI input interface, an HDMI output interface, an interference device and a signal output end;
the HDMI input interface is electrically connected with the HDMI output interface;
a plurality of pins of the HDMI output interface are connected with the voltage signal input end of the interference device;
the signal output end comprises an antenna interface;
the output end pin of the interference device is connected with the pin of the antenna interface;
the jammer generates a noise signal based on the change of the input voltage signal, and the noise signal is modulated and then output to the signal output end.
2. The HDMI adaptive video jamming device of claim 1, wherein said jammer is connected to a HOTPLUG pin of said HDMI output interface, said jammer further being electrically connected to at least one set of TMDS pins in said HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, and the duration of each group of white noise signals is 0.005-0.03s;
the jammer generates a plurality of groups of second white noise signals according to voltage changes of at least one group of TMDS pins in the HDMI output interface.
3. The HDMI adaptive video jamming device of claim 1, wherein said jammer is electrically connected to a hotlug pin and a clock pin of said HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, and the duration of each group of white noise signals is 0.005-0.03s;
the jammer generates a plurality of groups of second white noise signals according to the voltage change of the clock pin.
4. The HDMI adaptive video jamming device of claim 1, wherein said jammer is connected to the HOTPLUG pin of said HDMI output interface, said jammer further being electrically connected to three sets of TMDS pins in said HDMI output interface;
after HOTPLUG becomes high level, the interference device periodically tunes to generate a plurality of groups of first white noise signals, and the duration of each group of white noise signals is 0.005-0.03s;
and the jammer generates a plurality of groups of second white noise signals according to the voltage changes of the three groups of TMDS pins in the HDMI output interface.
5. The HDMI adaptive video jamming device of claim 4, wherein said jammer is tuned to produce sets of white noise signals each having a duration of 1-5 times the clock length when at least one pin voltage of the three sets of TMDS of the HDMI output interface is changed.
6. An HDMI adaptive video jamming device as in claim 1, wherein said jammer is connected to the HOTPLUG pin of said HDMI output interface, said jammer being tuned to produce sets of white noise signals each having a duration of 0.005-0.03s when the HOTPLUG goes high.
7. The HDMI adaptive video jamming device of claim 1, wherein said noise signals include a base noise signal and a dynamic noise signal.
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