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Image input device and image display system

An input device and video technology, applied in image communication, selective content distribution, electrical components, etc., can solve problems such as inability to perform HDCP authentication and inability to shorten drawing time.

Inactive Publication Date: 2014-05-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a conventional video receiving device, since there is only one circuit for performing HDCP authentication processing, only the HDCP authentication processing on the side of the HDMI port being selected can be executed, and the HDCP authentication processing on the unselected HDMI port is impossible. Therefore, even if the Hot Plug Detect of the non-selected HDMI port is enabled, HDCP authentication cannot be performed.
As a result, when switching the HDMI port, it is necessary to start the HDCP authentication process, and the drawing time cannot be shortened.

Method used

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  • Image input device and image display system
  • Image input device and image display system
  • Image input device and image display system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0120] figure 1 A configuration example of the video input device according to Embodiment 1 is shown. in figure 1 Among them, 101 and 102 are HDMI ports as the receiving interface unit, 103 is the input selection circuit, 104 is the connection detection circuit, 105 is the input signal selector, 106 is the input processing circuit, 107 and 108 are the HDCP as the encryption decryption processing circuit The processing circuit 109 is a video signal selector, and 110 is a monitor. In addition, the HDCP processing circuit 107 (108) includes: a false signal generation circuit 111 (115), a video signal selector 112 (116), an HDCP decryption circuit 113 (117) as a video decryption circuit, and authentication The key generation circuit 114 (118).

[0121] The HDMI ports 101 and 102 are ports used to connect to external devices via HDMI cables, and are used to receive digital video signals, and to write or read HDCP-related information (including authentication keys) with external dev...

Embodiment approach 2

[0140] Image 6 A configuration example of the video input device according to Embodiment 2 is shown. in Image 6 In, for and figure 1 Common components, labeling and figure 1 The same symbols are used, and detailed descriptions are omitted here. in Image 6 In the composition of figure 1 Compared with the configuration, an oscillator 131 that outputs a clock signal CK131 that oscillates at a certain cycle is provided, and the suspect signal generation circuit 111 (115) receives the clock signal CK131 instead of the clock signal CK101 (CK102) output from the HDMI port 101 (102) ). In addition, the connection detection circuit 104 is omitted.

[0141] Figure 7 show Image 6 An example of the configuration of the suspect signal generating circuit 111 (115). in Figure 7 In, for and figure 2 Common components, labeling and figure 2 The same symbols are used, and detailed descriptions are omitted here. versus figure 2 The difference between the configuration of the timing d...

Embodiment approach 3

[0150] Picture 10 A configuration example of the video input device according to Embodiment 3 is shown. in Picture 10 Among them, 201, 202, and 203 are HDMI ports as the receiving interface unit, 204 is the output image selection circuit, 205 is the input selection circuit, 206 and 207 are the first and second input signal selectors, and 208 and 209 are the first and second input signal selectors. The second input processing circuit 210 is a connection detection circuit, 211, 212, and 213 are HDCP processing circuits as encryption decryption processing circuits, 214 is a video signal selector, and 215 is a monitor.

[0151] HDMI ports 201, 202, and 203 are ports for connecting external devices via HDMI cables, and are used to receive digital video signals, and to write or read HDCP-related information (including authentication keys) with external devices Port. The digital signal received from the HDMI port 201 (202, 203) is output as the digital signal S201 (S202, S203), and t...

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PUM

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Abstract

An input processing circuit decodes a digital video signal selected by an input signal selector. Decryption circuits each decrypt the encryption of a video signal output from the input processing circuit, and generate an authentication key of the encryption. A video signal selector selects and outputs one of the video signals output from the decryption circuits, to a monitor. The decryption circuits each include a pseudo-signal generation circuit which extracts information from the video signal, and based on the extracted information, generates a pseudo-video signal.

Description

Technical field [0001] The present invention relates to an image input device that inputs a plurality of digital image signals and selects any one of the input digital image signals to output. Background technique [0002] In recent years, video reproduction devices equipped with interfaces that comply with the HDMI (High-Definition Multimedia Interface) standard that can transmit digital video signals in a non-compressed manner have rapidly become popular. Along with this, for video receiving equipment such as TVs that receive digital video signals, the installation of HDMI interfaces is also being promoted, and for video receiving equipment, equipment with two or more HDMI interfaces is increasing. In addition, HDCP (High-bandwidth Digital Contents Protection) is adopted as a technology for preventing illegal copying in HDMI, so that digital video signals can be sent and received only between successfully authenticated devices. [0003] In the case of a video receiving device eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/4367H04N21/436
CPCH04N21/43635H04N21/4367
Inventor 村上晋哉柳泽玲互加藤秀司岩田彻
Owner PANASONIC CORP