CN202406140U - Device for achieving high-bandwidth digital-content copy protection (HDCP) protocol data transparent transmission in high definition multimedia interface (HDMI) - Google Patents

Abstract

The utility model discloses a device for achieving HDCP protocol data transparent transmission in the HDMI, which comprises a transparent transmission matrix and a main controller; the transparent transmission matrix further comprises a microprocessor, a data buffer and a plurality of connecting modules; wherein the microprocessor receives switch distribution lists sent by the main controller and sends out switch instructions, the data buffer receives HDCP protocol data sent by sending ends, the plurality of connecting modules store the HDCP protocol data received by the data buffer, controls actions of corresponding connecting modules based on switch instructions sent by the microprocessor, and sends HDCP protocol data to field programmable gate arrays of corresponding receiving ends through passages built by connecting modules. According to the device for achieving HDCP protocol data transparent transmission in the HDMI, transparent transmission functions of field programmable gate arrays on HDCP protocol data in the HDMI are used, due to the advantages of the field programmable gate arrays, the device has the advantages of being simple in structure, low in research and development cost, and high in flexibility.

Description

A kind of device of realizing HDCP protocol data transparent transmission among the HDMI

Technical field

The utility model belongs to digital signal transmission field, particularly a kind of device of realizing HDCP protocol data transparent transmission among the HDMI.

Background technology

HDMI (High Definition Multimedia Interface; HDMI) be a kind of digitized video/COBBAIF technology; It is the tailored version digital interface that is fit to video Data Transmission; It is transmit audio signals and vision signal simultaneously, and the maximum data transmission speed is 5Gbps.For the high-definition video signal that guarantees the HDMI transmission can illegally not recorded, HDMI transmission technology and the collocation of HDCP technology are used, suffer unwarranted duplicating to prevent audio, video data with copyright.

In the transmission course of HDCP protocol data; Transmitting terminal and receiving terminal are all stored an available key collection; These keys are secret storages, and transmitting terminal and receiving terminal carry out the encrypting and decrypting computing according to key set respectively, also will add a video-encryption key in such computing.Each sending ending equipment and receiving device have a unique video-encryption key, and the cryptography processing units of sending ending equipment and receiving device can be checked the other side's video-encryption key, are legal to guarantee to connect.The ciphering process of HDCP protocol data is that each pixel is handled, and makes picture become to have no rule, can't discern, and has only transmitting terminal and receiving terminal after confirming synchronously just possibly carry out reverse process, the reduction of completion data.In decrypting process, system once connects affirmation in per 2 seconds, and simultaneously per 128 frame pictures carry out transmitting terminal and the synchronous identification code of receiving terminal, and that guarantees to connect is synchronous.

The transmission course of HDCP protocol data generally comprises multichannel input and multichannel output among the HDMI, and each road output all can be connected with different input signals, and the output of every road can only be connected the input of a certain road; But the input of a certain road all can be connected different output simultaneously; Therefore in order to realize selection, have the device that HDCP protocol data transparent transmission among a kind of HDMI of realization is provided now, but its structure is generally complicated to transmission path; Development cost is high, very flexible.

The utility model content

The utility model has proposed the device of HDCP protocol data transparent transmission among a kind of HDMI of realization to existing the problems referred to above that exist.The technological means that the utility model adopts is following:

A kind of device of realizing HDCP protocol data transparent transmission among the HDMI; It is characterized in that comprising the transparent transmission matrix that is connected between a plurality of transmitting terminals and a plurality of receiving terminal, and be connected with the transparent transmission matrix, send according to the hot-swappable signal of receiving terminal and switch the master controller that allocation table is given the transparent transmission matrix through the CAN bus; The transparent transmission matrix further comprises:

Connect master controller through the CAN bus, switching allocation table that the reception master controller sends and the microprocessor that sends switching command;

Connect a plurality of transmitting terminals through the I2C bus, the data buffer of the HDCP protocol data that receiving end/sending end sends;

The a plurality of link blocks that connect corresponding receiving terminal through the I2C bus;

Connect data buffer, connect microprocessor, and connect link block through the I2C bus through the CAN bus through parallel bus, thus the HDCP protocol data that store data buffer receives and control the field programmable gate array that corresponding link block action sets up the HDCP protocol data of storage through corresponding link block path sends to corresponding receiving terminal according to the switching command that microprocessor sends.

The device of HDCP protocol data transparent transmission is to have used field programmable gate array to realize the transparent transmission function to HDCP protocol data among the HDMI among the realization HDMI of the utility model; Because the advantage that field programmable gate array itself has; Make that this device is simple in structure with respect to prior art; R&D costs are low, and flexibility is strong.

Description of drawings

Fig. 1 is the schematic diagram of device of HDCP protocol data transparent transmission among the realization HDMI of the utility model.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.

As shown in Figure 1; The device of HDCP protocol data transparent transmission comprises the transparent transmission matrix 1 that is connected between a plurality of transmitting terminals and a plurality of receiving terminal among the realization HDMI of the utility model, and is connected with transparent transmission matrix 1, sends according to the hot-swappable signal of receiving terminal and switch the master controller 2 that allocation table is given transparent transmission matrix 1 through the CAN bus.

Transparent transmission matrix 1 further comprises: connect master controller 2 through the CAN bus, switching allocation table that reception master controller 2 sends and the microprocessor 14 that sends switching command; Connect a plurality of transmitting terminals through the I2C bus, the data buffer 11 of the HDCP protocol data that receiving end/sending end sends; The a plurality of link blocks 13 that connect corresponding receiving terminal through the I2C bus; Connect data buffer 11, connect microprocessor 14, also connect link block 13 through the I2C bus through the CAN bus through parallel bus; Thereby the HDCP protocol data that store data buffer 11 receives is also controlled 13 actions of corresponding link block are set up the HDCP protocol data of storage through corresponding link block 13 path according to the switching command that microprocessor 14 sends and is sent to the field programmable gate array 12 of corresponding receiving terminal, thereby has realized the transparent transmission of HDCP protocol data.

The device of HDCP protocol data transparent transmission is to have used the transparent transmission function that field programmable gate array 12 is realized HDCP protocol data among the HDMI among the realization HDMI of the utility model; Because the advantage that field programmable gate array itself has; Make that this device is simple in structure with respect to prior art; R&D costs are low, and flexibility is strong.

The above; Be merely the preferable embodiment of the utility model; But the protection range of the utility model is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or changes according to the technical scheme of the utility model and utility model design thereof in the technical scope that the utility model discloses, and all should be encompassed within the protection range of the utility model.

Claims (1)

1. device of realizing HDCP protocol data transparent transmission among the HDMI; It is characterized in that comprising the transparent transmission matrix that is connected between a plurality of transmitting terminals and a plurality of receiving terminal, and be connected with the transparent transmission matrix, send according to the hot-swappable signal of receiving terminal and switch the master controller that allocation table is given the transparent transmission matrix through the CAN bus; The transparent transmission matrix further comprises:

Connect master controller through the CAN bus, switching allocation table that the reception master controller sends and the microprocessor that sends switching command;

Connect a plurality of transmitting terminals through the I2C bus, the data buffer of the HDCP protocol data that receiving end/sending end sends;

The a plurality of link blocks that connect corresponding receiving terminal through the I2C bus;

Connect data buffer, connect microprocessor, and connect link block through the I2C bus through the CAN bus through parallel bus, thus the HDCP protocol data that store data buffer receives and control the field programmable gate array that corresponding link block action sets up the HDCP protocol data of storage through corresponding link block path sends to corresponding receiving terminal according to the switching command that microprocessor sends.

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