CN202488620U - Digital TV host, conditional access module and digital TV - Google Patents

Abstract

The utility model provides a digital television host which comprises an interface which is used for accessing a conditional access module, a tuner, a demodulation module, a decoding module, a video display module, and an audio playing module. The utility model further provides the conditional access module which comprises an access used for being accessed into the digital television host, an entitlement message parsing module, a control word decryption module, and a descrambling module. The utility model further provides a digital television which comprises the above television host and the conditional access module. With the utility module, according to different descrambling needs in different areas, the corresponding conditional access module can be inserted to carry out correct descrambling processing.

Description

Digital TV host, conditional access module and digital TV

technical field

The utility model relates to the technical field of digital television, in particular to a digital television host, a conditional access module and a digital television.

Background technique

The original TV cannot decode digital TV signals, but receives digital TV signals through a set-top box, after descrambling and decoding processing, an analog signal (such as an AV signal) is generated and transmitted to the TV connected to it through a corresponding terminal (such as an AV terminal) for playback .

With the promotion of digital programs, it is required that TVs can directly receive and process digital TV signals, that is, to realize the integrated function setting of TVs and set-top boxes, so that TVs can directly receive digital TV signals and perform descrambling and decoding. This kind of TV that can directly receive digital TV signals is called digital TV.

Digital TV signals are independently produced and broadcast by digital TV signal service providers in various regions. Therefore, the scrambling methods of digital TV signals in different places will be different. Since the original set-top box is an independent product and is provided by digital TV signal service providers in various places, its descrambling method must correspond to its scrambling method, and the digital TV signal can be correctly descrambled.

And the digital TV after the set-top box and the TV function are integrated, because it will be sold to various regions, the descrambling method adopted in the digital TV may be different from the scrambling method of the digital TV signal in the sales region. As a result, although digital television has the ability to directly receive digital television signals, it cannot correctly descramble the received digital television signals.

Utility model content

In view of this, the main purpose of this utility model is to provide a digital TV host, a conditional access module and a digital TV. According to different descrambling requirements in different regions, the corresponding conditional access module can be inserted to perform correct descrambling processing.

The digital TV host provided by the utility model includes:

An interface for accessing the conditional access module;

The high-frequency head is used to receive high-frequency digital TV signals and down-convert them to intermediate-frequency digital TV signals;

The demodulation module is connected with the tuner and the interface, and is used to generate a transmission stream from the intermediate frequency digital television signal down-converted by the tuner and transmit it to the interface;

A decoding module, connected to the interface, for receiving descrambled audio and video data from the interface, and performing decoding processing; and

The video display module and the audio playing module are connected with the decoding module, and are used to play the decoded audio and video data.

From the above, the interface, tuner, demodulation module, and decoding module for accessing the conditional access module are set on the digital TV host, and the conditional access module is no longer set, so that it can be produced without considering the descrambling method of each region Different, by setting the interface for accessing the conditional access module, the access of the conditional access module in each region is facilitated, and the correct descrambling of digital TV programs in each region is realized.

The conditional receiving module provided by the utility model includes:

The interface used to connect to the digital TV host;

An authorization information parsing module, connected to the interface, for receiving the transport stream from the interface, and parsing out authorization control information and authorization management information;

The control word decryption module is connected with the authorization information analysis module, and is used to decrypt the authorization control information and authorization management information according to the private key in the smart card, and decrypt the control word; and

The descrambling module is connected with the control word decryption module and the interface, and is used to descramble the audio and video data in the transport stream according to the control word, and output to the interface.

From the above, through the independent production conditional access module, each region can produce according to its own scrambling method, and connect to the digital TV host through the interface to realize the correct descrambling of the digital TV program received by the TV host. It can be seen that it will not affect the sales and popularization of digital TV in various regions.

The digital TV provided by the utility model includes a TV host and a conditional receiving module connected to the TV host through an interface;

The TV host includes:

The high-frequency head is used to receive high-frequency digital TV signals and down-convert them to intermediate-frequency digital TV signals;

The demodulation module is connected with the tuner and the interface, and is used to generate a transmission stream from the intermediate frequency digital television signal down-converted by the tuner and transmit it to the interface;

A decoding module, connected to the interface, for receiving descrambled audio and video data from the interface, and performing decoding processing; and

The video display module and the audio playback module are connected with the decoding module for playing the decoded audio and video data;

The conditional access module includes:

An authorization information parsing module, connected to the interface, for receiving the transport stream from the interface, and parsing out authorization control information and authorization management information;

The control word decryption module is connected with the authorization information analysis module, and is used to decrypt the authorization control information and authorization management information according to the private key in the smart card, and decrypt the control word; and

The descrambling module is connected with the control word decryption module and the interface, and is used to descramble the audio and video data in the transport stream according to the control word, and output to the interface.

It can be seen from the above that due to the external conditional access module (CAM), the corresponding CAM module can be inserted according to actual needs, so that the corresponding CAM can be inserted to perform correct descrambling according to different descrambling requirements in different regions deal with.

Wherein, the interface is a PCMCIA standard interface or a USB standard interface.

From the above, the use of standard interfaces facilitates the uniform production of the CAM module interface and the interface on the TV host according to the standard, so that digital TV can use CAM modules provided by different regions and manufacturers.

Wherein, the connection is through an I ² C bus.

From the above, the I ² C bus connection is used in each module in the digital TV, which is simple and effective. That is, since the space occupied by the I ² C bus is very small, the space of the circuit board and the number of chip pins are reduced, the interconnection cost is reduced, the connection relationship between various modules can be simplified, and the manufacturing is facilitated.

Wherein, the video display module includes: a driving module and a display screen connected thereto. The driving module is a low-voltage differential signal transmission module, and the display screen is a liquid crystal screen.

Wherein the audio playing module includes: a power amplifier circuit and a loudspeaker connected thereto.

From the above, the mainstream LCD screen can be used, driven by a low-voltage differential signal transmission module to meet the needs of users.

Description of drawings

Fig. 1 is the schematic diagram of the digital TV that comprises TV host computer, conditional access module of the present utility model;

Fig. 2 is a schematic circuit diagram of a specific embodiment of the present invention.

Detailed ways

Figure 1 shows the digital TV of the present invention, which includes a TV host and a conditional access module (CAM) connected to the TV host by plugging. Among them, the TV host and the CAM module have a matching standard interface, so that the CAM module can be connected to the TV host to realize the electrical connection between the CAM module and the TV host. The interface can be a golden finger, such as a PCMCIA interface, or a USB. and other interfaces. Wherein, a slot matching the shell of the CAM module can be arranged on the TV casing. For example, the CAM module can be made into a cuboid shape with the above-mentioned interface at one end, and the TV casing is provided with a concave groove matching the shape of the cuboid. To the corresponding interface on the TV host, the CAM module is inserted into the TV casing through the slot to insert the above interface.

The utility model is described in detail below. In this example, the interface of the electrical connection between the CAM module and the TV host adopts the PCMCIA interface.

Wherein, the TV host is used for receiving digital TV signals, and demodulates and demultiplexes the digital signals, and after descrambling processing by the CAM module connected to the TV host, the TV host decodes and plays. TV host includes:

The high-frequency head is used to receive high-frequency digital TV signals and down-convert them to intermediate-frequency digital TV signals. Among them, the utility model adopts a dual high-frequency head integrated with analog, cable digital TV and terrestrial digital TV to improve the practicability and applicability of the TV.

The demodulation module is used to demodulate the intermediate frequency digital TV signal, generate a transport stream (TS) and transmit it to the PCMCIA interface connected thereto, the transport stream includes demultiplexed scrambled audio and video data.

The decoding module is used to receive descrambled audio and video data from the PCMCIA interface connected thereto, and perform decoding processing to generate audio signals and video signals.

The video display module is used to display the video signal. Wherein, the video display module can be realized by the driver module and the display screen, such as the driver module can be a low voltage differential signal transmission (LVDS, Low Voltage Differential Signal) module, the display screen can be a liquid crystal screen, and the LCD screen is driven by the LVDS module to display the video signal .

The audio playing module is used to play the audio signal. Wherein, the audio playing module can be realized by a power amplifier circuit and a loudspeaker.

A conditional access module (CAM), which can be inserted into the user's smart card, is used to descramble the TS transport stream generated by the demodulation module of the TV host. It includes:

The entitlement information parsing module is used to receive the TS transmission stream generated by the demodulation module of the TV host from the PCMCIA interface, and parse out entitlement control information (ECM, EntitlementControl Message) and entitlement management information (EMM, Entitlement ManagementMessage).

The control word decryption module is used to read the private key (PDK) in the user's smart card, and decrypt the ECM and EMM according to the PDK, and decrypt the control word (CW).

The descrambling module is used to descramble the scrambled audio and video data in the TS transport stream received from the PCMCIA interface according to the control word (CW), and transmit the descrambled audio and video data to the PCMCIA interface.

As for the electrical connection relationship of each module of the TV host, it can also be connected through a bus, for example, they are all connected to an I ² C bus. In addition, the above-mentioned interface for connecting with the CAM module can be connected to the I ² C bus, or can be connected with the PCMCIA bus. Through the I ² C bus, the information transmission among various modules and the information transmission with the CAM module are realized. What kind of bus mode is specifically adopted is not the key point of the present invention, and will not be repeated here.

As shown in Fig. 2, realize a schematic circuit diagram of the utility model, in this figure, adopted a higher SOC chip of integration, as can adopt MSTAR 6i48 chip etc., realize the function of above-mentioned decoding module. The SOC chip also integrates a variety of interfaces as shown in Figure 2, including USB interface and RJ45 interface to realize data transmission through other interfaces, and also integrates AV, YPbPr, VGA, HDMI and other interfaces to transfer audio and video The signal is accessed through this interface. Since this part is not the focus of the present utility model, it will not be described in detail.

Below in conjunction with accompanying drawing 1, Fig. 2 the working principle of the present utility model is described, and wherein, when in use, above-mentioned CAM module should be inserted into smart card, and this CAM module should be inserted in the PCMCIA interface that TV host provides, to be connected to TV host superior. When receiving a digital TV signal for playback, the following steps are included:

Step 1: The high-frequency digital TV signal is received by the high-frequency head of the TV host, and then the down-frequency processing is performed to generate an intermediate-frequency digital TV signal.

Step 2: Demodulate the IF digital TV signal by the demodulation module of the TV host to generate a transport stream (TS) and transmit it to the PCMCIA interface. The transport stream includes demultiplexed scrambled audio and video data.

Step 3: The authorization information parsing module of the CAM module receives the above-mentioned TS transmission stream from the PCMCIA interface, parses out the ECM and EMM information, and transmits them to the control word decryption module.

Step 4: The control word decryption module of the CAM module reads the private key in the user's smart card, and decrypts the ECM and EMM accordingly, and decrypts the control word (CW).

Step 5: The descrambling module of the CAM module performs descrambling processing on the scrambled audio and video data received from the PCMCIA interface according to the CW, and sends the descrambled audio and video data to the PCMCIA interface .

Step 6: The decoding module of the TV host receives the descrambled audio and video data from the PCMCIA interface, and performs decoding processing to generate audio signals and video signals.

Step 7: Display the video signal and play the audio signal by the video display module and the audio playback module of the TV host respectively.

It can be seen from the above that since the TV host and the CAM module are not integrated, the connection is realized through the above method, that is, the digital TV signal is processed. The CAM module can be provided by digital TV signal service providers in various regions to adapt to the scrambling and encryption methods used in the production of digital TV programs in various regions. TVs can be produced independently without considering different descrambling issues in different regions. The TV host and the CAM module have the same standard interface, so that the CAM modules in different regions can be applied to TVs that meet the standard interface. After the corresponding interface of the TV host, the TV can correctly process the received digital TV signal.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For another example, the description or improvement of commonly used technologies such as setting the corresponding memory cache process data, setting the flash memory to store the program to be executed, or It is within the spirit and principle of the utility model to realize the modules with different functions through an integrated chip, and any modification, equivalent replacement, improvement, etc. should be included in the protection scope of the utility model.

Claims (15)

1. A digital TV host, characterized in that, comprising: An interface for accessing the conditional access module; The high-frequency head is used to receive high-frequency digital TV signals and down-convert them to intermediate-frequency digital TV signals; The demodulation module is connected with the tuner and the interface, and is used to generate a transmission stream from the intermediate frequency digital television signal down-converted by the tuner and transmit it to the interface; A decoding module, connected to the interface, for receiving descrambled audio and video data from the interface, and performing decoding processing; and The video display module and the audio playing module are connected with the decoding module, and are used to play the decoded audio and video data. 2. The digital TV host according to claim 1, wherein the interface is a PCMCIA standard interface or a USB standard interface. 3. The digital TV host according to claim 1, wherein the connection is through an I ² C bus. 4. The digital TV host according to claim 1, wherein the video display module comprises: a driver module and a display screen connected thereto. 5. The digital TV host according to claim 4, wherein the driving module is a low-voltage differential signal transmission module, and the display screen is a liquid crystal screen. 6. The digital TV host according to claim 1, wherein the audio playing module comprises: a power amplifier circuit and a speaker connected thereto. 7. A conditional access module, characterized in that, comprising: The interface used to connect to the digital TV host; An authorization information parsing module, connected to the interface, for receiving the transport stream from the interface, and parsing out authorization control information and authorization management information; The control word decryption module is connected with the authorization information analysis module, and is used to decrypt the authorization control information and authorization management information according to the private key in the smart card, and decrypt the control word; and The descrambling module is connected with the control word decryption module and the interface, and is used to descramble the audio and video data in the transport stream according to the control word, and output to the interface. 8. The conditional access module according to claim 7, characterized in that, the interface is an interface of PCMCIA standard or an interface of USB standard. 9. The conditional access module according to claim 7, wherein the connection is through an I ² C bus. 10. A digital TV, characterized in that it comprises a TV host and a conditional access module connected to the TV host through an interface; The TV host includes: The high-frequency head is used to receive high-frequency digital TV signals and down-convert them to intermediate-frequency digital TV signals; The demodulation module is connected with the tuner and the interface, and is used to generate a transmission stream from the intermediate frequency digital television signal down-converted by the tuner and transmit it to the interface; A decoding module, connected to the interface, for receiving descrambled audio and video data from the interface, and performing decoding processing; and The video display module and the audio playback module are connected with the decoding module for playing the decoded audio and video data; The conditional access module includes: An authorization information parsing module, connected to the interface, for receiving the transport stream from the interface, and parsing out authorization control information and authorization management information; The control word decryption module is connected with the authorization information analysis module, and is used to decrypt the authorization control information and authorization management information according to the private key in the smart card, and decrypt the control word; and The descrambling module is connected with the control word decryption module and the interface, and is used to descramble the audio and video data in the transport stream according to the control word, and output to the interface. 11. The digital television according to claim 10, characterized in that the interface is a PCMCIA standard interface or a USB standard interface. the 12. The digital television according to claim 10, wherein the connection is through an I ² C bus. 13. The digital television according to claim 10, wherein the video display module comprises: a driving module and a display screen connected thereto. 14. The digital television according to claim 13, wherein the driving module is a low-voltage differential signal transmission module, and the display screen is a liquid crystal screen. 15. The digital television according to claim 10, wherein the audio playing module comprises: a power amplifier circuit and a speaker connected thereto. the

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