CN114173076A

CN114173076A - Streaming media signal and method for using the same in a secure digital communication system

Info

Publication number: CN114173076A
Application number: CN202111113483.2A
Authority: CN
Inventors: 刘丹青; 刘世坚
Original assignee: Shanghai Opacs Electronics Co ltd
Current assignee: Shanghai Opacs Electronics Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-03-11

Abstract

The present invention relates to a streaming media signal for use in secure digital communication, which in some embodiments comprises: an audio handshake signal and a video streaming media signal. The streaming media signal is used for transmitting digital documents between computer workstations in a secure digital communication system. The audio handshake signal employs a dual tone multi-frequency (DTMF) signal. The video streaming media signal is composed of a plurality of digital streaming media. The secure digital communication device in the secure digital communication system forms a secure bridge and a telecommunication security barrier between an internal network and the internet, and the digital document is converted into a video streaming media signal, wherein the video streaming media signal comprises a QR two-dimensional code, a static image, a video fragment and the like. The video streaming media signals are transmitted between computer workstations through the open internet via the secure digital communication device 100 to avoid man-in-the-middle attacks and the introduction of various computer viruses.

Description

Streaming media signal and method for using the same in a secure digital communication system

Technical Field

The present invention relates to secure and reliable internet communication, and more particularly, to a streaming media signal for improving security and reliability, and a method for using the streaming media signal in a secure digital communication system.

Background

PACS (picture archiving and communication) is a medical imaging technology used primarily in medical institutions to securely store and digitally transmit electronic images and clinically relevant reports. The use of PACS avoids the need for manual archiving and storage, retrieval and transmission of sensitive information, film and reports. Instead, medical documents and images can be securely located in off-site servers, and medical personnel can use PACS software, computer workstations, and mobile communication devices to securely generate and use these medical documents and images from anywhere in the world at will.

Security, reliability, and patient privacy are critical when still images, video, and patient reports are transmitted from a computer workstation to a PACS server. In order to avoid Man-in-the-Middle attack (Man-in-the-Middle attack), address resolution protocol poisoning (ARP poisoning) and various internet virus infections, certain security measures must be taken to securely transmit various types of digital documents, such as intranet reports, medical diagnostic pictures and videos, over the open internet without a direct physical connection through a telecommunications security barrier between the intranet and the internet.

Thus, heretofore, there has been an unresolved safety problem in the industry to address the above-mentioned deficiencies and inadequacies.

Disclosure of Invention

In one aspect, the present invention relates to a streaming media signal for securely transmitting a set of digital documents in a secure digital communication system. In some embodiments, the streaming media signal comprises: an audio handshake signal and a video streaming media signal. Wherein the streaming media signal is used to transmit the set of digital documents between a first computer workstation and a second computer workstation in the secure digital communication system. The audio handshake signal employs a dual tone multi-frequency (DTMF) signal. The video streaming media signal is composed of a plurality of digital streaming media.

In some embodiments, the dual tone multi-frequency (DTMF) signal comprises: a tone A with a combination of 697 Hz low frequency and 1633 Hz high frequency; a B-tone with a combination of 770 Hz low frequency and 1633 Hz high frequency; a C-tone with a combination of low 852 Hz and high 1633 Hz frequencies; and a D-tone with a combination of low 941 hz and high 1633 hz frequencies.

In some embodiments, the A-call from the first computer workstation to the second computer workstation is used to indicate that the first computer workstation transmits a QR two-dimensional code handshake signal to the second computer workstation. The B call sent from the second computer workstation to the first computer workstation is used for confirming that the second computer workstation receives the QR two-dimensional code sent from the first computer workstation. The C-call from the first computer workstation to the second computer workstation is used to indicate that the first computer workstation transmits a video clip handshake signal to the second computer workstation. The D-call from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation receives the video clip from the first computer workstation.

In some embodiments, the digital streaming media comprises: a plurality of still images; and a plurality of video clips. Wherein the plurality of still images includes: one or more QR two-dimensional codes, and one or more color pictures.

In certain embodiments, the digital document comprises: a first type of digital document, a second type of digital document, a third type of digital document, and any combination of these digital documents. The first category of digital documents comprises: WORD documents, spreadsheet documents, slide presentation documents, PDF documents, and TEXT documents. The second type of digital document contains: still images, color pictures, and various two-dimensional designs, etc. The third category of digital documents contains: one or more video clips.

In some embodiments, the digital document is encoded into the streaming media signal by a streaming media signal codec of a first secure digital communication device installed on a first computer workstation in the secure digital communication system, and transmitted to a streaming media signal transceiver of a second secure digital communication device installed on a second computer workstation through the internet by a streaming media signal transceiver of the first secure digital communication device. And the streaming media signal transceiver of the second secure digital communication device transmits the received coded streaming media signal to the streaming media signal codec of the second secure digital communication device, and the streaming media signal codec of the second secure digital communication device decodes the coded streaming media signal into a digital document.

In some embodiments, the streaming media signal codec of the first secure digital communication device encodes the first type of digital document into a streaming media signal with an audio handshake signal and a QR two-dimensional code, and the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device through the internet. And the streaming media signal codec of the second secure digital communication device decodes the streaming media signal with the audio handshake signal and the QR two-dimensional code into a first type of digital document.

In some embodiments, the streaming media signal codec of the first secure digital communication device encodes the second type of digital document into a streaming media signal with an audio handshake signal and a color picture, and the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device via the internet. And the streaming media signal codec of the second secure digital communication device decodes the streaming media signal with the audio handshake signal and the color picture into a second type digital document.

In some embodiments, the streaming media signal codec of the first secure digital communication device encodes the third type of digital document into a streaming media signal with an audio handshake signal and a video clip, and the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device via the internet. And the streaming media signal codec of the second secure digital communication device decodes the streaming media signal with the audio handshake signal and the video segment into a third type digital document.

In another aspect, the present invention is directed to a method of securely transmitting a digital document in a secure digital communication system. In some embodiments, a method of securely transmitting a digital document in a secure digital communication system includes:

a user installs a first secure digital communication device on a first computer workstation and a second secure digital communication device on a second computer workstation in a secure digital communication system. The first secure digital communication device and the second secure digital communication device are each installed between an intranet and the internet across a firewall. The first computer workstation further comprises a set of digital documents sent to the second computer workstation;

the streaming media signal codec of the first secure digital communication device encodes the set of digital documents into a streaming media signal, wherein the streaming media signal comprises an audio handshake signal and a video streaming media signal;

the stream media signal codec of the first safe digital communication device transmits the coded stream media signal to a stream media signal transceiver of the first safe digital communication device through an HDMI interface;

the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device installed on the second computer workstation through the internet;

the streaming media signal transceiver of the second secure digital communication device transmits the received encoded streaming media signal to the streaming media signal codec of the second secure digital communication device through an HDMI interface; and

the stream media signal codec of the second secure digital communication device decodes the received encoded stream media signal into the set of digital documents and stores the set of digital documents in the second computer workstation.

In some embodiments, the streaming media signal comprises: the audio handshake signal and the video streaming media signal. The streaming media signal transmits the set of digital documents between a first computer workstation and a second computer workstation in the secure digital communication system. The audio handshake signal employs a dual tone multi-frequency (DTMF) signal. The video streaming media signal is composed of a plurality of digital streaming media.

In some embodiments, the dual tone multi-frequency (DTMF) signal comprises: an a-tone with a combination of 697 hz and 1633 hz at low frequency, a B-tone with a combination of 770 hz and 1633 hz at high frequency, a C-tone with a combination of 852 hz and 1633 hz at low frequency, and a D-tone with a combination of 941 hz and 1633 hz at high frequency.

In some embodiments, the A call from the first computer workstation to the second computer workstation is a handshake signal indicating that the first computer workstation transmits a QR two-dimensional code to the second computer workstation; the B call sent from the second computer workstation to the first computer workstation is used for confirming that the second computer workstation receives the QR two-dimensional code sent from the first computer workstation; the C call sent from the first computer workstation to the second computer workstation is used for indicating that the first computer workstation transmits a handshake signal of a video clip to the second computer workstation; and the D call sent from the second computer workstation to the first computer workstation is used for confirming that the second computer workstation receives the video clip sent by the first computer workstation.

In some embodiments, the digital streaming media comprises: a plurality of still images and a plurality of video clips. The plurality of still images includes: one or more QR two-dimensional codes, and one or more color pictures.

In some embodiments, the step of encoding the set of digital documents into a streaming media signal comprises: encoding the first type of digital document into a streaming media signal with an audio handshake signal and a QR two-dimensional code; coding the second type digital document into a streaming media signal with an audio handshake signal and a color picture; and encoding the third type of digital document into a streaming media signal with the audio handshake signal and the video segment.

In some embodiments, the step of decoding the encoded streaming media signal back into the set of digital documents comprises: decoding and restoring the streaming media signals with the audio handshake signals and the QR two-dimensional codes into a first-class digital document; decoding the streaming media signal with the audio handshake signal and the color picture to restore into a second type of digital document; and decoding the streaming media signal with the audio handshake signal and the video segment to restore a third type digital document.

In some embodiments, transmitting the streaming media signal between the streaming media signal codec and the streaming media signal transceiver in the secure digital communication device comprises: transmitting an audio handshake signal in a streaming media signal through one audio channel of the HDMI; and transmitting the video streaming media signal in the streaming media signal through one display data channel of the HDMI interface.

These and other aspects of the present invention will become apparent from the following description of the preferred embodiments taken in conjunction with the following drawings, although variations and modifications in these and other aspects may be effected without departing from the spirit and scope of the novel concepts of the invention.

Drawings

The accompanying drawings illustrate one or more embodiments of the invention and, together with the written description, serve to explain the principles of the invention. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts in different embodiments. The drawings are not intended to limit the invention to the specific embodiments disclosed and described herein. The drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present invention, and wherein:

FIG. 1 shows a block diagram of a secure digital communication device, according to some embodiments of the present invention;

FIG. 2 illustrates a block diagram of a codec for streaming media signals in a secure digital communication device, according to some embodiments of the present invention;

FIG. 3 illustrates a point-to-point secure digital communication between two computer workstations using a secure digital communication device, according to some embodiments of the present invention;

FIG. 4 illustrates waveforms and time curves for audio handshaking signals and video streaming media signals in streaming media signal transmission, according to some embodiments of the present invention;

FIG. 5 illustrates various frequency combinations of dual tone multi-frequency (DTMF) signals used by audio handshaking signals, in accordance with certain embodiments of the present invention;

FIG. 6 illustrates various tonal usage and temporal relationships of an audio handshake signal in the transmission of a QR two-dimensional code and a color picture in accordance with certain embodiments of the present invention;

FIG. 7 illustrates various tonal usage and temporal relationships of an audio handshake signal in the transmission of a QR two-dimensional code, a color picture and a video clip in accordance with certain embodiments of the present invention;

FIG. 8 illustrates an example text-based digital document, according to some embodiments of the invention;

FIG. 9 illustrates an example of a QR two-dimensional code formed by encoding the digital document of FIG. 8, in accordance with certain embodiments of the present invention;

FIG. 10 illustrates an example of a digital document showing a color picture according to some embodiments of the invention;

FIG. 11 illustrates a block diagram of a secure digital communication system employing a secure digital communication device, in accordance with certain embodiments of the present invention;

FIG. 12 illustrates a block diagram of a secure image archiving and communication system that employs a secure digital communication device in accordance with certain embodiments of the present invention; and

fig. 13 illustrates a flow chart of a method for securely transmitting a digital document in the secure digital communication system 10, in accordance with some embodiments of the present invention.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.

It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, devices, regions, layers and/or sections, these elements, devices, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, device, region, layer or section from another element, device, region, layer or section. Thus, a first element, device, region, layer or section discussed below could be termed a second element, device, region, layer or section without departing from the teachings of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" or "comprising," or "having," when used herein, specify the presence of stated features, regions, integers, steps, operations, elements, and/or devices, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, devices, and/or groups thereof.

Furthermore, relative terms such as "lower" or "bottom," "upper" or "top," and "front" or "rear," may be used herein to describe one element's relationship to another element as illustrated in the figures. It will be understood that the relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one figure is turned over, elements described as being on the "lower" side of other elements would then be oriented on "upper" sides of the other elements. Thus, the exemplary term "lower" can encompass an orientation of "lower" and "upper" depending on the particular orientation of the figure. Similarly, if the device in one figure is turned over, elements described as "below" or "beneath" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "under" or "beneath" can encompass both an orientation of above and below.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

As used in this specification, a streaming media protocol includes:

RTSP is a real-time streaming media transfer protocol;

RTMP is a real-time short message transfer protocol;

webRTC is Internet real-time communication;

HTTP real-time streaming media playing;

LL-HLS, low-delay HTTP real-time streaming media playing;

DASH, dynamic adaptation streaming media playing through HTTP; and

SRT, safe and reliable transfer protocol.

The streaming media protocol uses TCP (transport control protocol) and UDP (user data graph protocol) for internet transmission. TCP protocol is mainly used for point-to-point data streams, while UDP is mainly used for one-to-many data streams.

As used herein, the term module may refer to or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a combinational logic circuit, a Field Programmable Gate Array (FPGA), a shared, dedicated, or combined processor that executes code, and other suitable hardware components that provide the described functionality, or combinations of some or all of the above, e.g., on a single computer system. The term module may also include shared, dedicated, or combined memory that stores processor-executable instructions.

The term code, as used herein, may include software, firmware, and/or microcode, and may refer to programs, routines, and various software functions, etc. The term "shared" as used above means that some or all code from multiple modules may be executed using a single or common processor. In addition, some or all code from multiple modules may be stored by a single or shared memory. The term group, as used above, means that a group of processors can be used to execute some or all of the code in a single module. In addition, some or all code in a single module may be stored using a set of memories.

In the following description, numerous specific details are provided to provide a thorough understanding of the invention, but the invention may be practiced using other means than those described herein, and the invention is not limited to the specific embodiments disclosed below.

The present invention will be described more fully herein with reference to the accompanying drawings, in which embodiments of the invention are shown. The present invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers generally refer to like elements.

In one aspect, as shown in FIG. 1, the present invention relates to a secure digital communication device 100. In some embodiments, the secure digital communication device 100 includes: a streaming media signal codec 102, and a streaming media signal transceiver 104. As shown in fig. 2, the codec 102 for streaming media signals includes an audio codec 1023 and a video codec 1024. Wherein the audio codec 1023 includes: AAC, AAC-LC, HE-AAC +, v1& v2, MP3, Speex, Opus, and Vorbis, among others. The video codec 1024 includes: h.264, H.265, VP8, and VP9, and the like. Here the streaming media protocol uses TCP (transport control protocol) and UDP (user data graph protocol) for internet transport. TCP protocol is mainly used for point-to-point data streams, while UDP is mainly used for one-to-many data streams.

In some embodiments, streaming media in the internet may use many streaming media propagation protocols, such as: RTSP (real-time streaming protocol), RTMP (real-time short messaging protocol), webRTC (internet real-time communication), HLC (HTTP live streaming protocol), LL-HLS (low-latency HTTP live streaming protocol), DASH (dynamic adaptation streaming over HTTP), and SRT (secure and reliable delivery protocol), among others.

As shown in fig. 1, the codec 102 includes a first interface 1021 and a second interface 1022. The first interface 1021 of the codec 102 receives one or more digital documents 101 from the intranet 16, and the digital documents 101 are encoded by the codec 102 to form a streaming media signal 103. The second interface 1022 of the streaming media signal codec 102 receives a streaming media signal 103, and the streaming media signal codec 102 decodes the received streaming media signal 103 to restore the streaming media signal 103 into one or more digital documents 101. The streaming media signal transceiver 104 includes a first interface 1041 and a second interface 1042.

The first interface 1041 of the streaming media signal transceiver 104 receives the streaming media signal 103 from the second interface of the streaming media signal codec 102, and transmits the streaming media signal 103 to the internet 18 through the second interface of the streaming media signal transceiver 104. The second interface 1042 of the streaming media signal transceiver 104 receives the streaming media signal 103 from the internet 18 and transmits the received streaming media signal 103 to the streaming media signal codec 102 through the first interface 1041 of the streaming media signal transceiver 104.

In some embodiments, the secure digital communication device 100 is installed between an intranet 16 of a computer workstation and the internet 18 across a firewall 17 to form a telecommunications security barrier between the intranet 16 and the internet 18.

In some embodiments, as shown in FIG. 3, when the first interface 1021 of the codec 102 of the first secure digital communication device 1001 installed in the first computer workstation 2001 receives a set of digital documents 101 from the intranet 16, the codec 102 of the first secure digital communication device 1001 encodes the set of digital documents 101 into a streaming media signal 103, and transmits the encoded streaming media signal 103 to the first interface 1041 of the streaming media signal transceiver 104 of the first secure digital communication device 1001 through the second interface 1022 via the HDMI interface 105, and the streaming media signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the second interface 1042 of the streaming media signal transceiver 104 of the second secure digital communication device 1002 installed in the second computer workstation 2002 through the internet 18 via the second interface 1042 thereof.

In some embodiments, the streaming media signal 103 includes an audio handshake signal 1031 and a video streaming media signal 1032. Wherein the audio handshake signal 1031 coordinates and controls the transmission of a video streaming media signal 1032, the video streaming media signal 1032 further comprising one or more QR two-dimensional codes 10321, one or more color pictures 10322, and one or more video segments 10323.

In some embodiments, the set of digital documents 101 includes a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, a still image, various video clips, and any combination of such documents.

In some embodiments, as shown in fig. 1 and 2, the set of digital documents 101 includes: a first type of digital document 1011, a second type of digital document 1012, a third type of digital document 1013, and any combination of these digital documents. The first category of digital documents 1011 includes: a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, etc. Fig. 8 illustrates an exemplary text-based digital document, which is an application form for ultrasound examination, and which serves as an example of a first type of digital document 1011. The second type of digital document 1012 includes: still images, color images, two-dimensional design patterns, and the like. Fig. 10 shows a typical ultrasonic image of ultrasonic examination as an example of the second type of digital document 1012. The third digital content 1013 includes: one or more video clips (not shown in the drawings). One or more color pictures (second type digital documents 1012) may also be included in the video clip as a special case of the video clip.

In some embodiments, the streaming media signal codec 102 of the first secure digital communication device 1001 performs the following functions: (1) encoding a first-class digital document 1011 into a streaming media signal 103 with an audio handshake signal 1031 and a QR two-dimensional code 10321; (2) encoding the second type digital document 1012 into a streaming media signal 103 with audio handshake signals 1031 and color image 10322; and (3) encoding the third type digital document 1013 into a streaming media signal 103 with the audio handshake signals 1031 and the video segment 10323. The streaming media signal transceiver 104 of the first secure digital communication device 1001 of the first computer workstation 2001 transmits the encoded streaming media signal 103 to the streaming media signal transceiver 104 of the second secure digital communication apparatus 1002 of the second computer workstation 2002 via the internet 18.

In some embodiments, when the second interface 1042 of the streaming media signal transceiver 104 of the second secure digital communication apparatus 1002 of the second computer workstation 2002 receives the encoded streaming media signal 103, the streaming media signal transceiver 104 of the second secure digital communication apparatus 1002 transmits the encoded streaming media signal 103 to the second interface 1022 of the streaming media signal codec 102 of the second secure digital communication apparatus 1002 through the HDMI interface 105 via the first interface 1041, and the streaming media signal codec 102 of the second secure digital communication apparatus 1002 decodes the received encoded streaming media signal 103 into the set of digital documents 101 and stores the decoded digital documents 101 in the second computer workstation 2002.

In some embodiments, the secure digital communication device 100 further comprises an HDMI interface 105 between the second interface 1022 of the streaming media signal codec 102 and the first interface 1041 of the streaming media signal transceiver 104 in each secure digital communication device 100. Wherein the streaming media signal 103 is transmitted through the HDMI interface 105, the audio handshake signal 1031 of the streaming media signal 103 is transmitted through an audio channel of the HDMI interface 105, and the video streaming media signal 1032 of the streaming media signal 103 is transmitted through a display data channel of the HDMI interface 105.

In another aspect, the present invention relates to a streaming media signal 103 for secure transmission of a set of digital documents 101 in a secure digital communication system 10. In some embodiments, as shown in fig. 4, the streaming media signal 103 includes: an audio handshake signal 1031, and a video streaming media signal 1032. Wherein the streaming media signal 103 is used to transmit the set of digital documents 101 between two computer workstations in the secure digital communication system 10. The audio handshake signal 1031 is a Dual Tone Multi Frequency (DTMF) signal. The video streaming media signal 1032 is composed of a plurality of digital streaming media. Audio handshake signal 1031 coordinates the transmission of video streaming media signal 1032. The video streaming media signal 1032 of the streaming media signal 103 includes the QR two-dimensional code 10321 shown in fig. 1, the color image 10322 shown in fig. 10, and one or more video segments 10323 (not shown).

In some embodiments, as shown in fig. 5, the dual tone multi-frequency (DTMF) signal comprises at least: a tone A with a combination of 697 Hz low frequency and 1633 Hz high frequency; a B-tone with a combination of 770 Hz low frequency and 1633 Hz high frequency; a C-tone with a combination of low 852 Hz and high 1633 Hz frequencies; and a D-tone with a combination of low 941 hz and high 1633 hz frequencies.

In some embodiments, as shown in fig. 4, when the audio handshake signal 1031 changes from high voltage to low voltage at time T11, the streaming media signal transceiver 104 of the first secure digital communication device 1001 of the first computer workstation 2001 transmits the video streaming media signal 1032 (the first image) through its second interface 1042 to the second interface 1042 of the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 via the internet 18. When the video streaming media signal 1032 (the first image) is transmitted at the time T12, the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 sends an acknowledgement to the streaming media signal transceiver 1042 of the first secure digital communication device 1002 of the first computer workstation 2001, that is, the audio handshake signal 1031 is changed from low voltage to high voltage at the time T12.

When the audio handshake signal 1031 changes from high voltage to low voltage at time T21, the streaming media signal transceiver 104 of the first secure digital communication device 1001 of the first computer workstation 2001 transmits the video streaming media signal 1032 (the second image) to the second interface 1042 of the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 via the internet 18 through the second interface 1042 thereof. When the video streaming media signal 1032 (the second image) is transmitted at the time T22, the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 sends a confirmation message to the streaming media signal transceiver 1042 of the first secure digital communication device 1002 of the first computer workstation 2001, that is, the audio handshake signal 1031 is changed from low voltage to high voltage at the time T22.

In some embodiments, as shown in FIG. 6, the A-call from the first computer workstation 2001 to the second computer workstation 2002 at times T1 and T3 is used to indicate that the first computer workstation 2001 transmits a QR two-dimensional code handshake signal to the second computer workstation 2002. The B-call sent from the second computer workstation 2002 to the first computer workstation 2001 at times T2 and T4 is used to confirm that the second computer workstation 2002 received the QR two-dimensional code sent from the first computer workstation 2001. The C call from the first computer workstation 2001 to the second computer workstation 2002 at times T5 and T7 is used to indicate that the first computer workstation 2001 is transmitting a video clip handshake signal to the second computer workstation 2002. The D call from the second computer workstation 2002 to the first computer workstation 2001 at times T6 and T8 is used to confirm that the second computer workstation 2002 received the video clip from the first computer workstation 2001.

In some embodiments, the video segments may also contain one or more color images. Thus, the transmission of the second type of digital document 1012 and the third type of digital document 1013 is coordinated in the audio handshake signal 1031 of the streaming media signal 103 using C and D tones.

As shown in FIG. 7, the tone A transmitted from the second computer workstation 2002 to the first computer workstation 2001 at times T1 and T3 is that the second computer workstation 2002 transmits a QR two-dimensional code handshake signal to the first computer workstation 2001. The B-call sent from the first computer workstation 2001 to the second computer workstation 2002 at times T2 and T4 is used to confirm that the first computer workstation 2001 receives the QR two-dimensional code sent from the second computer workstation 2002. The C tone sent from the second computer workstation 2002 to the first computer workstation 2001 at times T5 and T7 is a handshake signal that the second computer workstation 2002 transmits a video clip to the first computer workstation 2001. The D call from the first computer workstation 2001 to the second computer workstation 2002 at times T6 and T8 is used to confirm that the first computer workstation 2001 received the video clip from the second computer workstation 2002.

In some embodiments, in some private networks (e.g., intranet 16), no actual connections are allowed between the private network and the open internet, such as CAT-5 cable connectors and USB interface connectors. The secure digital communication device 100 forms a secure bridge and a telecommunication security barrier between the intranet 16 and the internet 18, and the digital document 101 is converted into a QR two-dimensional code and transmitted through the secure digital communication device 100 to avoid MITM attacks and the introduction of various computer viruses.

In some embodiments, the digital document 101 is encoded into the streaming media signal 103 by a streaming media signal codec 102 of a first secure digital communication device 1001 installed on a first computer workstation 2001 in the secure digital communication system 10, and transmitted by a streaming media signal transceiver 104 of the first secure digital communication device 1001 to a streaming media signal transceiver 104 of a second secure digital communication device 1002 installed on a second computer workstation 2002 via the internet 18. The streaming media signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming media signal 103 to the streaming media signal codec 102 of the second secure digital communication device 1002, and the encoded streaming media signal 103 is decoded by the streaming media signal codec 102 of the second secure digital communication device 1002 to be restored to the digital document 101.

In some embodiments, the streaming media signal codec 102 of the first secure digital communication device 1001 encodes the first type of digital document 1011 into the streaming media signal 103 with the audio handshake signal 1031 and the QR two-dimensional code 10321, and the streaming media signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the streaming media signal transceiver 104 of the second secure digital communication device 1002 through the internet 18. The streaming media signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming media signal 103 to the streaming media signal codec 102 of the second secure digital communication device 1002, and the streaming media signal 103 with the audio handshake signal 1031 and the QR two-dimensional code 10321 is decoded and restored to the first type digital document 1011 by the streaming media signal codec 102 of the second secure digital communication device 1002.

In some embodiments, the streaming media signal codec 102 of the first secure digital communication device 1001 encodes the second type digital document 1012 into the streaming media signal 103 with the audio handshake signal 1031 and the color picture 10322, and the streaming media signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the streaming media signal transceiver 104 of the second secure digital communication device 1002 via the internet 18. The streaming media signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming media signal 103 to the streaming media signal codec 102 of the second secure digital communication device 1002, and the streaming media signal 103 with the audio handshake signal 1031 and the color picture 10322 is decoded and restored to the second type digital document 1012 by the streaming media signal codec 102 of the second secure digital communication device 1002.

In some embodiments, the streaming media signal codec 102 of the first secure digital communication device 1001 encodes the third type digital document 1013 into the streaming media signal 103 with the audio handshake signal 1031 and the video segment 10323, and the streaming media signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the streaming media signal transceiver 104 of the second secure digital communication device 1002 via the internet 18. The streaming media signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming media signal 103 to the streaming media signal codec 102 of the second secure digital communication device 1002, and the streaming media signal 103 with the audio handshake signal 1031 and the video segment 10323 is decoded and restored to the third type digital document 1013 by the streaming media signal codec 102 of the second secure digital communication device 1002.

In another aspect, the present invention relates to a secure digital communication system 10. In some embodiments, as shown in fig. 11, the secure digital communication system 10 includes: a secure digital communication system server 12, a set of computer workstations 200 installed in the intranet 16, and a set of secure digital communication devices 100. The secure digital communication system server 12 is connected to a database 14 and a server secure digital communication device 1000. The plurality of computer workstations 200 are all connected to the secure digital communications system server 12 via the internet 18. Each secure digital communication device 100 connects a corresponding computer workstation 200 with the secure digital communication system server 12 through the server secure digital communication device 1000, for securing the communication between each computer workstation 200 and the secure digital communication system server 12.

In some embodiments, each secure digital communication device 100 and the server secure digital communication device 1000 comprises: a streaming media signal codec 102, and a streaming media signal transceiver 104. The codec 102 comprises a first interface 1021 and a second interface 1022. The streaming media signal transceiver 104 also includes a first interface 1041 and a second interface 1042. The secure digital communication device 100 is installed between an intranet 16 of a computer workstation that spans a firewall 17 and the internet 18 to form a telecommunications security barrier between the intranet 16 and the internet 18.

In some embodiments, when the first interface 1021 of the codec 102 of the first secure digital communication device 1001 installed in the first computer workstation 2001 receives a set of digital documents 101 from the intranet 16, the codec 102 of the first secure digital communication device 1001 encodes the set of digital documents 101 into a streaming media signal 103 and transmits the encoded streaming media signal 103 to the first interface 1041 of the streaming media transceiver 104 of the first secure digital communication device 1001 through the HDMI interface 105 via the second interface 1022 thereof, and the streaming media transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the second interface 1042 of the streaming media transceiver 104 of the second secure digital communication device 1002 installed in the second computer workstation 2002 via the internet 18 via the second interface 1042 thereof.

In some embodiments, when the encoded streaming media signal 103 is received by the second interface 1042 of the streaming media signal transceiver 104 of the second secure digital communication device 1002, the streaming media signal transceiver 104 of the second secure digital communication device 1002 transmits the encoded streaming media signal 103 to the second interface 1022 of the streaming media signal codec 102 of the second secure digital communication device 1002 through the first interface 1041 via the HDMI interface 105, and the streaming media signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming media signal 103 into the set of digital documents 101 and stores the decoded digital documents 101 in the second computer workstation 2002.

In some embodiments, the streaming media signal 103 includes an audio handshake signal 1031 and a video streaming media signal 1032. Wherein the audio handshake signal 1031 coordinates and controls the transmission of the video streaming media signal 1032. The video streaming media signal 1032 further comprises one or more QR two-dimensional codes 10321, one or more color pictures 10322, and one or more video segments 10323.

In some embodiments, the secure digital communication device 100 further comprises an HDMI interface 105 between the second interface 1022 of the streaming media signal codec 102 and the first interface 1041 of the streaming media signal transceiver 104 in the secure digital communication device 100. Wherein the streaming media signal 103 is transmitted through the HDMI interface 105, the audio handshake signal 1031 of the streaming media signal 103 is transmitted through an audio channel of the HDMI interface 105, and the video streaming media signal 1032 of the streaming media signal 103 is transmitted through a display data channel of the HDMI interface 105.

In yet another aspect, the present invention relates to a secure Picture Archiving and Communication System (PACS) 20. In some embodiments, as shown in fig. 12, the secure image archiving and communication system 20 includes: a secure PACS server 22, a set of PACS computer workstations 300 installed in the intranet 16, and a set of secure digital communication devices 100. Wherein the secure PACS server 22 is connected to a PACS database 24 and a server secure digital communication device 1000. The set of PACS computer workstations 300 are all connected to the secure PACS server 22 via the internet 18. For example, a first secured digital communication device 1001 is connected to a first PACS computer workstation 3001, a second secured digital communication device 1002 is connected to a second PACS computer workstation 3002, …, and an Nth secured digital communication device 100N is connected to an Nth PACS computer workstation 300N. Each of the secure digital communication apparatuses 100 connects a corresponding PACS computer workstation 300 with the secure PACS server 22 through the server secure digital communication apparatus 1000 for securing the communication between the PACS computer workstations 300 and the secure PACS server 22.

In some embodiments, each secure digital communication device 100 and the server secure digital communication device 1000 comprises: a streaming media signal codec 102, and a streaming media signal transceiver 104. The codec 102 comprises a first interface 1021 and a second interface 1022. The streaming media signal transceiver 104 also includes a first interface 1041 and a second interface 1042. The secure digital communication apparatus 100 is installed between an intranet 16 of a PACS computer workstation that spans a firewall 17 and the internet 18 to form a telecommunications security barrier between the intranet 16 and the internet 18.

In some embodiments, when the first interface 1021 of the streaming media codec 102 of the first secure digital communication device 1001 installed in the first PACS computer workstation 3001 receives a set of PACS documents 101 from the intranet 16, the streaming media codec 102 of the first secure digital communication device 1001 encodes the set of PACS documents 101 into a streaming media signal 103 and transmits the encoded streaming media signal 103 to the first interface 1041 of the streaming media transceiver 104 of the first secure digital communication device 1001 through the second interface 1022 thereof, and the streaming media transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the second interface 1042 of the streaming media transceiver 104 of the second secure digital communication device 1002 installed in the second PACS computer workstation 3002 through the internet 18 through the second interface 1042 thereof.

In some embodiments, when the encoded streaming media signal 103 is received by the second interface 1042 of the streaming media signal transceiver 104 of the second secure digital communication device 1002, the streaming media signal transceiver 104 of the second secure digital communication device 1002 sends the encoded streaming media signal 103 to the second interface 1022 of the streaming media signal codec 102 of the second secure digital communication device 1002 through the first interface 1041 thereof, and the streaming media signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming media signal 103 back into the set of PACS documents 101 and stores the decoded PACS documents 101 in the second PACS computer workstation 3002.

In certain embodiments, the set of PACS digital documents 101 includes a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, a still image, various video segments, and any combination of such documents.

In some embodiments, the streaming media signal 103 includes an audio handshake signal 1031 and a video streaming media signal 1032. The audio handshake signal 1031 coordinates and controls the transmission of the video streaming media signal 1032. The video streaming media signal 1032 further comprises one or more QR two-dimensional codes 10321, one or more color pictures 10322, and one or more video segments 10323.

In yet another aspect, the present invention relates to a method of securely transmitting a digital document in a secure digital communication system 10. In some embodiments, a flow chart 1300 of a method of securely transmitting a digital document in a secure digital communication system 10 according to some embodiments of the present invention is shown in FIG. 13:

at block 1302: a user installs a first secure digital communication device 1001 on a first computer workstation 2001 and a second secure digital communication device 1002 on a second computer workstation 2002 in a secure digital communication system 10. The first secured digital communication device 1001 and the second secured digital communication device 1002 are each installed between the intranet 16 and the internet 18 across a firewall 17. The first computer workstation 2001 also contains a set of digital documents 101 destined for the second computer workstation 2002;

at block 1304: the streaming media signal codec 102 of the first secure digital communication device 1001 encodes the set of digital documents 101 into a streaming media signal 103, wherein the streaming media signal 103 comprises an audio handshake signal 1031 and a video streaming media signal 1032;

at block 1306: the streaming media signal codec 102 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to a streaming media signal transceiver 104 of the first secure digital communication device 1001 through an HDMI interface 105;

at block 1308: the streaming media signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the streaming media signal transceiver 104 of the second secure digital communication device 1002 installed on the second computer workstation 2002 via the internet 18;

at block 1310: the streaming media signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming media signal 103 to the streaming media signal codec 102 of the second secure digital communication device 1002 through an HDMI interface 105;

at block 1312: the streaming media signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming media signal 103 back into the set of digital documents 101;

at block 1314: the codec 102 of the second secure digital communication device 1002 stores the decoded and restored set of digital documents 101 in the second computer workstation 2002.

In certain embodiments, the streaming media signal 103 comprises: said audio handshake signal 1031 and said video streaming media signal 1032. The streaming media signal 103 transports the set of digital documents 101 between the first computer workstation 2001 and the second computer workstation 2002 in the secure digital communication system 10. The audio handshake signal 1031 is a Dual Tone Multi Frequency (DTMF) signal. The video streaming media signal 1032 is composed of a plurality of digital streaming media.

In some embodiments, the A call from the first computer workstation 2001 to the second computer workstation 2002 is used to indicate that the first computer workstation 2001 transmits a QR two-dimensional code handshake signal to the second computer workstation 2002; the call B sent from the second computer workstation 2002 to the first computer workstation 2001 is used to confirm that the second computer workstation 2002 receives the QR two-dimensional code sent from the first computer workstation 2001; the C call from the first computer workstation 2001 to the second computer workstation 2002 is a handshake signal indicating that the first computer workstation 2001 transmits a video clip to the second computer workstation 2002; and the D-call from the second computer workstation 2002 to the first computer workstation 2001 is used to confirm that the second computer workstation 2002 received the video clip from the first computer workstation 2001.

In certain embodiments, the digital document 101 contains: a first type of digital document 1011, a second type of digital document 1012, a third type of digital document 1013, and any combination of these digital documents. The first category of digital documents 1011 contains: WORD documents, spreadsheet documents, slide presentation documents, PDF documents, and TEXT documents. The second type of digital document 1012 contains: still images, color pictures, and various two-dimensional designs, etc. The third type of digital document 1013 contains: one or more video clips.

In certain embodiments, the step of encoding the set of digital documents 101 into the streaming media signal 103 comprises: encoding a first-class digital document 1011 into a streaming media signal 103 with an audio handshake signal 1031 and a QR two-dimensional code 10321; encoding the second type digital document 1012 into the streaming media signal 103 with the audio handshake signals 1031 and the color picture 10322; and encoding the third type of digital document 1013 into a streaming media signal 103 with an audio handshake signal 1031 and a video segment 10323.

In some embodiments, the step of decoding the encoded streaming media signal 103 back into the set of digital documents 101 comprises: decoding and restoring the streaming media signal 103 with the audio handshake signal 1031 and the QR two-dimensional code 10321 into a first-class digital document 1011; decoding the streaming media signal 103 with the audio handshake signal 1031 and the color picture 10322 back into the second type digital document 1012; and decoding the streaming media signal 103 with the audio handshake signal 1031 and the video segment 10323 back into a third type of digital document 1013.

In some embodiments, transmitting the streaming media signal 103 between the streaming media signal codec 102 and the streaming media signal transceiver 104 in the secure digital communication device 100 includes: transmitting the audio handshake signal 1031 in the streaming media signal 103 through one audio channel of the HDMI interface 105; and transmitting the video streaming media signal 1032 in the streaming media signal 103 through one display data channel of the HDMI interface 105.

The foregoing description of various exemplary embodiments of the invention has been presented only to illustrate and set forth portions of the invention and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching and the above teaching. The embodiments were chosen and described in order to explain the principles of the invention and its practical application to enable one skilled in the art to utilize the invention and various embodiments and with various modifications as are suited to the particular use contemplated. Alternative embodiments will become apparent to those skilled in the art to which the present invention relates without departing from its spirit and scope. The scope of the invention is therefore defined by the appended claims, the foregoing description and the exemplary embodiments described therein, as well as the accompanying drawings.

Claims

1. A streaming media signal for securely transmitting a set of digital documents in a secure digital communication system, comprising:

an audio handshake signal, and

a video stream media signal is transmitted to a video stream media signal,

wherein the streaming media signal is transmitted between a first computer workstation and a second computer workstation in a secure digital communication system, the audio handshake signal employs a dual tone multi-frequency (DTMF) signal, and the video streaming media signal is composed of a plurality of digital streaming media.

2. The streaming media signal of claim 1, wherein said dual tone multi-frequency (DTMF) signal comprises:

a tone A with a combination of 697 Hz low frequency and 1633 Hz high frequency;

a B-tone with a combination of 770 Hz low frequency and 1633 Hz high frequency;

a C-tone with a combination of low 852 Hz and high 1633 Hz frequencies; and

a D-tone with a combination of low 941 hz and high 1633 hz frequencies.

3. The streaming media signal of claim 2, wherein the digital streaming media comprises:

a plurality of still images; and

a plurality of video segments.

4. The streaming media signal of claim 3, wherein the plurality of still images includes:

one or more QR two-dimensional codes; and

one or more color pictures.

5. The streaming media signal of claim 4, wherein

The A call sent from the first computer workstation to the second computer workstation is used for expressing that the first computer workstation transmits a handshake signal of a QR two-dimensional code to the second computer workstation;

the B call sent from the second computer workstation to the first computer workstation is used for confirming that the second computer workstation receives the QR two-dimensional code sent from the first computer workstation;

the C call sent from the first computer workstation to the second computer workstation is used for indicating that the first computer workstation transmits a handshake signal of a video clip to the second computer workstation; and

the D-call from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation receives the video clip from the first computer workstation.

6. The streaming media signal of claim 5, wherein the digital document comprises:

a first type of digital document, wherein the first type of digital document comprises: WORD documents, spreadsheet documents, slide presentation documents, PDF documents, and TEXT documents;

a second type of digital document, wherein the second type of digital document comprises: still images, color pictures, and various two-dimensional design patterns, etc.;

a third type of digital document, wherein the third type of digital document comprises: one or more video clips; and

any combination of the above types of digital documents.

7. The streaming media signal according to claim 6, wherein the digital document is encoded into the streaming media signal by a streaming media signal codec of a first secure digital communication device installed on a first computer workstation in the secure digital communication system, and transmitted to a streaming media signal transceiver of a second secure digital communication device installed on a second computer workstation through the internet by a streaming media signal transceiver of the first secure digital communication device, the streaming media signal transceiver of the second secure digital communication device transmitting the received encoded streaming media signal to a streaming media signal codec of the second secure digital communication device, and the encoded streaming media signal being decoded into the digital document by a streaming media signal codec of the second secure digital communication device.

8. The streaming media signal according to claim 7, wherein the streaming media signal codec of the first secure digital communication device encodes the first type of digital document into the streaming media signal with the audio handshake signal and the QR two-dimensional code, the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device through the internet, the streaming media signal transceiver of the second secure digital communication device transmits the received encoded streaming media signal to the streaming media signal codec of the second secure digital communication device, and the streaming media signal with the audio handshake signal and the QR two-dimensional code is decoded by the streaming media signal codec of the second secure digital communication device to restore the streaming media signal with the audio handshake signal and the QR two-dimensional code into the first type of digital document.

9. The streaming media signal according to claim 7, wherein the streaming media signal codec of the first secure digital communication device encodes the second type of digital document into the streaming media signal with the audio handshake signal and the color picture, the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device via the internet, the streaming media signal transceiver of the second secure digital communication device transmits the received encoded streaming media signal to the streaming media signal codec of the second secure digital communication device, and the streaming media signal with the audio handshake signal and the color picture is decoded by the streaming media signal codec of the second secure digital communication device to be restored into the second type of digital document.

10. The streaming media signal according to claim 7, wherein the streaming media signal codec of the first secure digital communication device encodes a third type of digital document into the streaming media signal with the audio handshake signal and the video segment, the streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device via the internet, the streaming media signal transceiver of the second secure digital communication device transmits the received encoded streaming media signal to the streaming media signal codec of the second secure digital communication device, and the streaming media signal codec of the second secure digital communication device decodes the streaming media signal with the audio handshake signal and the video segment into the third type of digital document.

11. A method of securely transmitting a digital document in a secure digital communication system, comprising:

installing a first secure digital communication device on a first computer workstation and a second secure digital communication device on a second computer workstation of a secure digital communication system by a user, said first secure digital communication device and said second secure digital communication device both being installed between an intranet spanning a firewall and the internet, wherein the first computer workstation contains a set of digital documents addressed to the second computer workstation;

the stream media signal transceiver of the first secure digital communication device transmits the encoded stream media signal to a stream media signal transceiver of a second secure digital communication device installed on a second computer workstation through the internet;

12. The method of claim 11, wherein the streaming media signal comprises:

said audio handshake signal, and

the video stream media signal is transmitted to the receiver,

wherein the streaming media signal transmits the set of digital documents between a first computer workstation and a second computer workstation in a secure digital communication system, the audio handshake signal employs a dual tone multi-frequency (DTMF) signal, and the video streaming media signal is comprised of a plurality of digital streaming media.

13. The method of claim 12, wherein said dual tone multi-frequency (DTMF) signals comprise at least:

a tone A with a combination of 697 Hz low frequency and 1633 Hz high frequency;

a B-tone with a combination of 770 Hz low frequency and 1633 Hz high frequency;

a C-tone with a combination of low 852 Hz and high 1633 Hz frequencies; and

a D-tone with a combination of low 941 hz and high 1633 hz frequencies.

14. The method of claim 13, wherein

15. The method of claim 12, wherein said digital streaming media comprises:

a plurality of still images; and

a plurality of video segments.

16. The method of claim 15, wherein the plurality of still images includes:

one or more QR two-dimensional codes; and

one or more color pictures.

17. The method of claim 16, wherein the digital document comprises:

any combination of the above types of digital documents.

18. The method of claim 17, wherein the step of encoding the set of digital documents into a streaming media signal comprises:

encoding the first type of digital document into a streaming media signal with an audio handshake signal and a QR two-dimensional code;

coding the second type digital document into a streaming media signal with an audio handshake signal and a color picture; and

the third type of digital semantic file is encoded into a streaming media signal with an audio handshake signal and a video segment.

19. The method of claim 18, wherein the step of decoding the encoded streaming media signal back into the set of digital documents comprises:

decoding and restoring the streaming media signals with the audio handshake signals and the QR two-dimensional codes into a first-class digital document;

decoding the streaming media signal with the audio handshake signal and the color picture to restore into a second type of digital document; and

and decoding the streaming media signals with the audio handshake signals and the video segments to restore a third type of digital document.

20. The method of claim 19, wherein transmitting the streaming media signal between the streaming media signal codec and the streaming media signal transceiver in the secure digital communication device comprises:

transmitting an audio handshake signal in a streaming media signal through one audio channel of the HDMI; and

and transmitting the video streaming media signal in the streaming media signal through one display data channel of the HDMI interface.