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Transmitting device, receiving device and transmitting/receiving system

A technology of sending device and receiving device, which is applied in the direction of transmission system, digital transmission system, safety communication device, etc. It can solve the problems of increasing port load capacity, waveform sinking, and inability to transmit information, etc., and achieves the effect of great practical effect

Inactive Publication Date: 2005-02-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] In the prior art transceiving signal system, in the structure shown in FIG. 4 , the transmission control unit 142 must prepare another port besides the port controlling the low-speed bus 162, so there is a problem of increasing the size of the transmission control unit 142 and making the transmission control unit 142 high price problem
[0029] On the other hand, in the prior art signal sending and receiving system shown in Fig. 5, one port of the sending control unit 142 is connected with the encryption control unit 141 and the 3rd memory which keeps the sending side information 147, thereby increasing the port load capacity
Therefore, after the transmission line 160 is extended, there will be a problem of waveform sinking (waveform なまり) and the inability to transmit information.
[0030] In addition, the structure shown in FIG. 4 and the structure shown in FIG. 5 are all in the display device on the receiving side, so that two of the receiving control unit 145 and the receiving side information 147 are connected to the low-speed bus 162, and the load capacity is very large.
This also makes it difficult for the transmission line 160 to be long-distance

Method used

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  • Transmitting device, receiving device and transmitting/receiving system
  • Transmitting device, receiving device and transmitting/receiving system
  • Transmitting device, receiving device and transmitting/receiving system

Examples

Experimental program
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no. 1 Embodiment approach

[0064] figure 1 It is a block diagram showing the transmission device according to the first embodiment of the present invention. In this figure, the structure of the display device 35 connected to the transmission device 19 is also shown for convenience of description. The structure of the display device is the same as that of the prior art example shown in FIG. 4 .

[0065] as figure 1 As shown, the sending device 19 of this embodiment is characterized by: including a sending-side control data storage unit 14 for storing the EDID 47 of the display device 35 , and a sending-side control data processing unit 13 .

[0066] The transmission device 19 of this embodiment is a part of a transmission-side processing device 31 such as a DVD player. That is, the transmitting side processing unit 31 has a first memory storing a first device key, a transmission control unit 15 connected to the first memory, a transmission data processing unit 16 , and a transmitting device 19 .

...

no. 2 Embodiment approach

[0087] figure 2 It is a block diagram showing the receiving device according to the second embodiment of the present invention. In this figure, for convenience of description, a transmission-side processing unit 37 having the same structure as the conventional one is also shown.

[0088] as figure 2 As shown, the receiving device 19 of this embodiment is characterized in that it is, for example, a part of the display device 33, includes a receiving side control data storage unit 24 intended to store EDID and information required for machine authentication, and a receiving side control data processing Unit 23.

[0089] figure 2 The shown display device 33 includes: a receiving device 29 connected to a transmission line 60 comprising a high-speed bus 61 and a low-speed bus 62, holding a 4th memory for receiving side information 27 including EDID and the 2nd device key, and the 4th memory The memory is connected to a receiving control unit 25 that controls the authentication ...

no. 3 Embodiment approach

[0111] image 3 It is a block diagram showing the transmission and reception system according to the third embodiment of the present invention. As shown in this figure, it is the transceiver system related to this embodiment, which is composed of figure 1 The transmission device 19 according to the first embodiment shown is composed of figure 2 The receiving device 29 according to the second embodiment shown is combined. exist image 3 in, right with figure 1 , figure 2 Means shown are the same means, assigned the same symbols. In addition, the means of actions that have already been described will not be repeated. In this embodiment, a case where the transmission line 60 conforms to the DVI standard, and the encryption means 12 and the data decoding unit 22 encrypt and decode according to the HDCP standard is used as an example to describe.

[0112] In the display device 33 , the reception control unit 25 reads the reception side information 27 and stores it in the r...

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Abstract

The present invention relates to a transmitting device, receiving device and transmitting / receiving system. A transmitting device (19) includes a transmission side control data memory (14). A receiving device (29) includes a receiving side control data memory (24). In an operation state, EDID, a device key for and HDCP and the like are stored in the receiving side control data memory (24). Subsequently, the EDID and information necessary for HDCP authentication are copied from the receiving side control data memory (24) to the transmission side control data memory (14) through the DDC. A transmission controller (15) accesses the transmission side control data memory (14) and executes plug-and-play and HDCP authentication. The DDC realizes a one-to-one connection between the transmitting device (19) and the receiving device (29). Thus, waveform distortion can be minimized and the length of a cable can be increased in a simple manner.

Description

technical field [0001] The invention relates to a sending device, a receiving device and a sending and receiving system for high-speed transmission of image signals. Background technique [0002] In the prior art, the DVI (Digital Visual Interface) standard has long been known as an interface for high-speed transmission of digital image signals between the computer body and the display (for example, refer to Patent Document 1). [0003] In addition, HDCP (High-bandwidth Digital Content Protection) is also known as an illegal copy protection method of DVI (see Patent Document 1). Next, the transceiver system adopting the HDCP in the prior art will be described, [0004] Fig. 4 is a block diagram showing an example of a conventional transceiver system. The video signal transmission and reception system shown in this figure includes a transmitting unit 143 and a receiving unit 148 . [0005] In the transmission and reception system, the transmission unit 143 is a part of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/91H04L9/00H04L9/08H04N7/167H04N21/4363H04N21/4367
CPCG09G5/006G09G2370/047H04L2209/60G09G2370/12H04L9/00
Inventor 柳泽玲互
Owner PANASONIC CORP
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