CN112260721A - A-CAS communication circuit, control method and A-CAS communication device - Google Patents
A-CAS communication circuit, control method and A-CAS communication device Download PDFInfo
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- CN112260721A CN112260721A CN202011137094.9A CN202011137094A CN112260721A CN 112260721 A CN112260721 A CN 112260721A CN 202011137094 A CN202011137094 A CN 202011137094A CN 112260721 A CN112260721 A CN 112260721A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/088—Usage controlling of secret information, e.g. techniques for restricting cryptographic keys to pre-authorized uses, different access levels, validity of crypto-period, different key- or password length, or different strong and weak cryptographic algorithms
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Abstract
The invention provides an A-CAS communication circuit, a control method and an A-CAS communication device, wherein the A-CAS communication circuit comprises an A-CAS module, a main control module and a communication module, the communication module comprises a first communication interface and a second communication interface, and the A-CAS communication circuit comprises a first CAS module, a second CAS module, a first CAS: an A-CAS module for storing a key for decrypting the media signal; and the main control module is used for decrypting the encrypted media signal according to the key to obtain decrypted media information and performing playing operation according to the decrypted media information. The first communication interface and the second communication interface which are connected in a pluggable mode are respectively connected with the A-CAS module and the main control module, so that the A-CAS module can be easily detached when the main control module is damaged, the operation difficulty is reduced, and meanwhile the damage to the A-CAS module in the detaching and welding processes can be avoided.
Description
Technical Field
The invention relates to the field of display, in particular to an A-CAS communication circuit, an A-CAS communication circuit control method and an A-CAS communication device.
Background
With the delivery of 4K broadcast television programs, the percentage of TV's on the market that support the playback of 4K broadcast video has increased year by year. The 4K broadcast program needs to be decrypted using the a-CAS IC. The existing installation method is to install the A-CAS IC on the mainboard in a welding mode, and because of the uniqueness and confidentiality of the ACAS IC, once the mainboard fails and needs to be maintained or replaced, the ACAS IC needs to be disassembled separately and welded on a new mainboard again, so that certain difficulty exists in the after-sale treatment of the terminal, and the ACAS IC is easily damaged in the disassembling and welding processes.
Disclosure of Invention
The invention mainly aims to provide an A-CAS communication circuit, an A-CAS communication circuit control method and an A-CAS communication device, and aims to solve the problem that in the prior art, an ACAS IC is difficult to maintain and replace.
In order to achieve the above object, the present invention provides an a-CAS communication circuit, where the a-CAS communication circuit includes an a-CAS module, a main control module, and a communication module, the communication module includes a first communication interface and a second communication interface, the first communication interface and the second communication interface are connected in a pluggable manner, the a-CAS module is connected in a communication manner with the first communication interface, and the main control module is connected in a communication manner with the second communication interface, where:
the A-CAS module is used for storing a key for decrypting the media signal;
the main control module is used for receiving encrypted media information and reading a key of a decrypted media signal stored in the A-CAS module, decrypting the encrypted media signal according to the key to obtain decrypted media information, and performing playing operation according to the decrypted media information.
Optionally, the communication module is a USB interface, the first communication interface is a USB male interface, and the second communication interface is a USB female interface.
Optionally, the A-CAS module includes an A-CAS chip and a first resistor,
the power supply end of the A-CAS chip is connected with the power supply end of the USB male connector, the setting end of the A-CAS chip is connected with the negative data end of the USB male connector, the clock end of the A-CAS chip is connected with the positive data end of the USB male connector, the communication interface of the A-CAS chip is connected with the negative receiving end of the USB male connector, the grounding end of the A-CAS chip is grounded, the positive receiving end of the USB male connector is grounded through the first resistor, and the grounding end of the USB male connector is grounded.
Optionally, the main control module comprises a main control chip, a card reading chip and a second resistor,
the power end of the card reading chip is connected with the power end of the USB female head interface, the setting end of the card reading chip is connected with the negative data end of the USB female head interface, the clock end of the card reading chip is connected with the positive data end of the USB female head interface, the communication end of the card reading chip is connected with the negative receiving end of the USB female head interface, the detection end of the card reading chip is connected with the positive receiving end of the USB female head interface, the detection end of the card reading chip is further connected with a power supply through the second resistor, the main control chip is in communication connection with the card reading chip, and the grounding end of the USB female head interface is grounded.
Optionally, the a-CAS module further comprises a display unit, the display unit comprising a first light emitting diode and a second light emitting diode;
the positive pole of the first light-emitting diode is connected with the sending negative end of the USB male connector, the negative pole of the first light-emitting diode is grounded, the positive pole of the second light-emitting diode is connected with the sending positive end of the USB male connector, and the negative pole of the second light-emitting diode is grounded.
Optionally, the circuit further includes a display control unit, where the display control unit includes a first triode, a second triode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the base electrode of the first triode is connected with the first output end of the main control chip through the third resistor, the base electrode of the first triode is also connected with a power supply through the fourth resistor, the collector electrode of the first triode is connected with the sending negative end of the USB female connector, the collector electrode of the first triode is also connected with the power supply through the fifth resistor, and the emitter electrode of the first triode is grounded; the base of the second triode passes through the sixth resistance connection the second output end of the main control chip, the base of the second triode still passes through the seventh resistance connection power supply, the collector of the second triode is connected with the sending positive end of the USB female connector, the collector of the second triode still passes through the eighth resistance connection power supply, and the emitter of the second triode is grounded.
Further, to achieve the above object, the present invention also provides an a-CAS communication method applied to the a-CAS communication circuit as described above, the method including:
storing, by the A-CAS module, a key to decrypt the media signal;
and receiving encrypted media information and a key for reading the decrypted media signal stored in the A-CAS module through a main control module, decrypting the encrypted media signal according to the key to obtain decrypted media information, and playing according to the decrypted media information.
Optionally, the steps of receiving, by the master control module, the encrypted media information and reading the key for decrypting the media signal stored in the a-CAS module include:
detecting whether the card is connected to the A-CAS module or not through a card reading chip;
and if the A-CAS module is not connected, the prompting operation is executed through the main control chip to prompt the user to insert the A-CAS module.
Optionally, the step of detecting whether to connect to the a-CAS module by using the card reading chip further includes:
if the key is connected to the A-CAS module, executing reading operation and judging whether the key is read or not;
if the key is read, the key is sent to the main control chip, and a first control signal is sent to the display control unit through the main control chip, so that the display control unit sends a display signal to a second light-emitting diode according to the first control signal;
and receiving the display signal sent by the display control unit through a second light-emitting diode, and lightening the second light-emitting diode when the display signal is received.
Further, to achieve the above object, the present invention also provides an a-CAS communication apparatus including a housing and an a-CAS communication circuit configured to a-CAS communication as described above or applied to an a-CAS communication method as described above.
The invention provides an A-CAS communication circuit, an A-CAS communication circuit control method and an A-CAS communication device, wherein the A-CAS communication circuit comprises an A-CAS module, a main control module and a communication module, the communication module comprises a first communication interface and a second communication interface, the first communication interface and the second communication interface can be connected in a pluggable communication mode, the A-CAS module is connected with the first communication interface in a communication mode, and the main control module is connected with the second communication interface in a communication mode, wherein: the A-CAS module is used for storing a key for decrypting the media signal; the main control module is used for receiving encrypted media information and reading a key of a decrypted media signal stored in the A-CAS module, decrypting the encrypted media signal according to the key to obtain decrypted media information, and performing playing operation according to the decrypted media information. The first communication interface and the second communication interface which are connected in a pluggable mode are respectively connected with the A-CAS module and the main control module, so that the A-CAS module can be easily detached when the main control module is damaged, the operation difficulty is reduced, and meanwhile the damage to the A-CAS module in the detaching and welding processes can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of an A-CAS communication circuit of the present invention;
FIG. 2 is a circuit diagram of an A-CAS module of the embodiment of FIG. 1, in which the A-CAS communication circuit of the present invention is applied;
fig. 3 is a circuit diagram of a main control module in the embodiment of fig. 1, in which the a-CAS communication circuit of the present invention is applied.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | A-CAS module | H1 | A-CAS |
| 120 | Display unit | H2 | |
| 200 | Communication module | H3 | |
| 210 | First communication interface | Q1 | First third- |
| 220 | Second communication interface | Q2 | |
| 300 | Main control module | LEDR | First |
| 320 | Display control unit | LEDG | Second light emitting diode |
| USB1 | USB male interface | R1～R8 | First to eighth resistors |
| USB2 | USB female interface |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides an a-CAS communication circuit, which is applied to an a-CAS communication device, such as a television, and please refer to fig. 1, in which fig. 1 is a functional block diagram of an embodiment of the a-CAS communication circuit of the present invention. In this embodiment, the a-CAS communication circuit includes an a-CAS module 100, a master control module 300 and a communication module 200, the communication module 200 includes a first communication interface 210 and a second communication interface 220, the first communication interface 210 and the second communication interface 220 are pluggable to be connected in communication, the a-CAS module 100 is connected in communication with the first communication interface 210, and the master control module 300 is connected in communication with the second communication interface 220, where:
the a-CAS module 100 is configured to store a key for decrypting a media signal;
the main control module 300 is configured to receive encrypted media information and a key for reading a decrypted media signal stored in the a-CAS module 100, decrypt the encrypted media signal according to the key to obtain decrypted media information, and perform a playing operation according to the decrypted media information.
The main control module is further connected to a signal receiving module (not shown), where the signal receiving module includes Tuner and Demod, the Tuner is configured to receive a broadcast signal and send the received broadcast signal to Demod, and the Demod is configured to receive the broadcast signal sent by Tuner and convert the broadcast signal into an encrypted media signal and send the encrypted media signal to the main control module.
In the embodiment, the first communication interface 210 and the second communication interface 220 which are connected in a pluggable manner are respectively connected with the a-CAS module 100 and the main control module 300, so that when the main control module 300 is damaged, the a-CAS module 100 can be easily detached, the operation difficulty is reduced, and meanwhile, the damage to the a-CAS module 100 in the detaching and welding processes can be avoided.
Referring to fig. 2, further, the communication module 200 is a USB interface, the first communication interface 210 is a USB male interface USB1, and the second communication interface 220 is a USB female interface USB 2.
Further, the A-CAS module 100 includes an A-CAS chip H1 and a first resistor R1,
the power supply end of the A-CAS chip H1 is connected with the power supply end of the USB male interface USB1, the set end of the A-CAS chip H1 is connected with the data negative end of the USB male interface USB1, the clock end of the A-CAS chip H1 is connected with the data positive end of the USB male interface USB1, the communication interface of the A-CAS chip H1 is connected with the receiving negative end of the USB male interface USB1, the grounding end of the A-CAS chip H1 is grounded, the receiving positive end of the USB male interface USB1 is grounded through the first resistor R1, and the grounding end of the USB male interface USB1 is grounded.
Referring to fig. 3, further, the master control module 300 includes a master control chip H3, a card reading chip H2 and a second resistor R2,
the power supply end of the card reading chip H2 is connected with the power supply end of the USB female head interface USB2, the setting end of the card reading chip H2 is connected with the data negative end of the USB female head interface USB2, the clock end of the card reading chip H2 is connected with the data positive end of the USB female head interface USB2, the communication end of the card reading chip H2 is connected with the receiving negative end of the USB female head interface USB2, the detection end of the card reading chip H2 is connected with the receiving positive end of the USB female head interface USB2, the detection end of the card reading chip H2 is further connected with a power supply through the second resistor R2, the main control chip H3 is in communication connection with the card reading chip H2, and the ground end of the USB female head interface USB2 is grounded.
The USB male connector USB1 is in corresponding communication with the connecting end of the USB female connector USB2, the power end of the USB female connector USB2 is in communication with the power end of the USB male connector USB1, the data negative end of the USB female connector USB2 is in communication with the data negative end of the USB male connector USB1, the data positive end of the USB female connector USB2 is in communication with the data positive end of the USB male connector USB1, the communication end of the USB female connector USB2 is in communication with the communication end of the USB male connector USB1, the receiving positive end of the USB female connector USB2 is in communication with the receiving positive end of the USB male connector USB1, the power end of the USB female connector USB2 is in communication with the power end of the USB male connector USB1, and the receiving negative end of the USB female connector USB2 is in communication with the receiving negative end of the USB male connector USB 1.
When the A-CAS module 100 is not connected with the main control module 300, the detection end of the card reading chip H2 continuously receives a high level, when the A-CAS module 100 is connected with the main control module 300, the detection end of the card reading chip H2 is grounded through the first resistor R1 through the communication module 200, the detection end of the card reading chip H2 receives a low level signal, a terminal is triggered, and the fact that the A-CAS module 100 is inserted is determined.
Further, the a-CAS module 100 further includes a display unit 120, the display unit 120 including a first light emitting diode LEDR and a second light emitting diode LEDG;
the anode of the first light emitting diode LEDR is connected with the sending negative terminal of the USB male connector USB1, the cathode of the first light emitting diode LEDR is grounded, the anode of the second light emitting diode LEDG is connected with the sending positive terminal of the USB male connector USB1, and the cathode of the second light emitting diode LEDG is grounded.
Further, the circuit further includes a display control unit 320, and the display control unit 320 includes a first transistor Q1, a second transistor Q2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;
the base electrode of the first triode Q1 is connected with the first output end of the master control chip H3 through the third resistor R3, the base electrode of the first triode Q1 is also connected with a power supply through the fourth resistor R4, the collector electrode of the first triode Q1 is connected with the transmitting negative terminal of the USB female connector USB2, the collector electrode of the first triode Q1 is also connected with the power supply through the fifth resistor R5, and the emitter electrode of the first triode Q1 is grounded; the base of the second triode Q2 passes through the sixth resistor R6 is connected the second output end of the main control chip H3, the base of the second triode Q2 still passes through the seventh resistor R7 is connected with the power supply, the collector of the second triode Q2 is connected with the transmitting positive end of the USB female connector USB2, the collector of the second triode Q2 still passes through the eighth resistor R8 is connected with the power supply, and the emitter of the second triode Q2 is grounded.
In the initial state, i.e., when the main control chip H3 is powered on, the main control chip H3 sends a low level signal to both the base of the first transistor Q1 and the base of the second transistor Q2.
When the card reading chip H2 reads a key, the key is sent to the master control chip H3, when the master control chip H3 receives the key, a high level signal is sent to the base electrode of the first triode Q1, a low level signal is sent to the base electrode of the second triode Q2, the first triode Q1 is conducted, the first light emitting diode LEDR is not lightened, the second triode Q2 is cut off, and the second light emitting diode LEDG is lightened.
When the card reading chip H2 fails to read the key, a fault signal is sent to the main control chip H3, when the main control chip H3 receives the fault signal, a low level signal is sent to the base electrode of the first triode Q1, a high level signal is sent to the base electrode of the second triode Q2, the first triode Q1 is cut off, the first light emitting diode LEDR is lightened, the second triode Q2 is cut off and conducted, and the second light emitting diode LEDG is not lightened.
It should be noted that the first light emitting diode LEDR and the second light emitting diode LEDG are different in color, and in this embodiment, the first light emitting diode LEDR is a red light emitting diode, and the second light emitting diode LEDG is a green light emitting diode.
In addition, the present invention also protects an a-CAS communication method, which, in a first embodiment of the a-CAS communication method of the present invention, includes the steps of:
step S10, storing a key for decrypting the media signal by the a-CAS module;
step S20, receiving, by the main control module, the encrypted media information and the key for reading the decrypted media signal stored in the a-CAS module, decrypting, according to the key, the encrypted media signal to obtain decrypted media information, and performing a play operation according to the decrypted media information.
The main control chip is connected with the display screen, after the main control module reads the key sent by the A-CAS module, the main control module decrypts the encrypted media signal according to the key to obtain decrypted media information, and sends a control signal to the display screen according to the decrypted media information, so that the display screen displays the content corresponding to the media signal.
In the embodiment, the first communication interface and the second communication interface which are connected in a pluggable manner are respectively connected with the A-CAS module and the main control module, so that the A-CAS module can be easily detached when the main control module is damaged, the operation difficulty is reduced, and meanwhile, the damage to the A-CAS module in the detaching and welding processes can be avoided.
Further, in the second embodiment based on the first embodiment of the a-CAS communication method of the present invention, the step of step S20 is preceded by the steps of:
step S30, detecting whether the card is connected to the A-CAS module through the card reading chip;
in step S31, if the connection is not made to the a-CAS module, a prompt operation is performed through the main control chip to prompt the user to insert the a-CAS module.
In this embodiment, the prompt operation includes sending a prompt signal to the display screen, so that the display screen displays a prompt message "please insert the a-CAS module". It is understood that the prompting operation may also include other prompting manners such as voice prompt.
In the embodiment, the prompt operation is executed when the main control module is connected to the A-CAS module, so that a user can know the connection condition of the A-CAS module in time.
Further, in a third embodiment based on the second embodiment of the a-CAS communication method of the present invention, the step of S30 is further followed by the step of:
step S32, if connected to the A-CAS module, executing reading operation and judging whether to read the key;
step S33, if the key is read, the key is sent to the main control chip, and a first control signal is sent to the display control unit through the main control chip, so that the display control unit sends a display signal to a second light emitting diode according to the first control signal;
and step S34, receiving the display signal sent by the display control unit through a second light-emitting diode, and lighting when receiving the display signal.
In an initial state, namely when the main control chip is powered on, the main control chip simultaneously sends a low level signal to the base electrode of the first triode and the base electrode of the second triode.
When the card reading chip reads the key, the key is sent to the main control chip, when the main control chip receives the key, a high level signal is sent to a base electrode of the first triode, a low level signal is sent to a base electrode of the second triode, the first triode is conducted, the first light emitting diode is not lightened, the second triode is cut off, and the second light emitting diode is lightened.
When the card reading chip fails to read the secret key, a fault signal is sent to the main control chip, when the main control chip receives the fault signal, a low level signal is sent to a base electrode of the first triode, a high level signal is sent to a base electrode of the second triode, the first triode is cut off, the first light emitting diode is lightened, the second triode is cut off and conducted, and the second light emitting diode is not lightened. Meanwhile, when the card reading chip fails to read the media signals, the main control chip can also send control signals of reading failure to the display screen, so that the display screen displays corresponding prompt information.
In the embodiment, the connection state of the A-CAS chip can be clearly known by a user by controlling different light emitting diodes to display under different connection states of the A-CAS chip.
The method is applied to an a-CAS communication circuit, and the structure of the a-CAS communication circuit can refer to the above embodiments, which are not described herein again. The implementation process is consistent with the foregoing structural embodiment, and can be executed by reference.
The invention also protects an a-CAS communication apparatus, which includes a housing and an a-CAS communication circuit, and the structure of the a-CAS communication circuit can refer to the above embodiments, and is not described herein again. It should be understood that, since the protection device of the present embodiment adopts the technical solution of the above-mentioned a-CAS communication circuit, the protection device has all the beneficial effects of the above-mentioned a-CAS communication circuit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. The term "comprising", without further limitation, means that the element so defined is not excluded from the group of processes, methods, articles, or systems that include the element. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An a-CAS communication circuit, the circuit comprising an a-CAS module, a master control module, and a communication module, the communication module comprising a first communication interface and a second communication interface, the first communication interface and the second communication interface being pluggable to communicate, the a-CAS module being communicatively connected to the first communication interface, the master control module being communicatively connected to the second communication interface, wherein:
the A-CAS module is used for storing a key for decrypting the media signal;
the main control module is used for receiving encrypted media information and reading a key of a decrypted media signal stored in the A-CAS module, decrypting the encrypted media signal according to the key to obtain decrypted media information, and performing playing operation according to the decrypted media information.
2. The a-CAS communication circuit according to claim 1, wherein the communication module is a USB interface, the first communication interface is a USB male interface, and the second communication interface is a USB female interface.
3. The A-CAS communication circuit of claim 2 wherein the A-CAS module comprises an A-CAS chip and a first resistor,
the power supply end of the A-CAS chip is connected with the power supply end of the USB male connector, the setting end of the A-CAS chip is connected with the negative data end of the USB male connector, the clock end of the A-CAS chip is connected with the positive data end of the USB male connector, the communication interface of the A-CAS chip is connected with the negative receiving end of the USB male connector, the grounding end of the A-CAS chip is grounded, the positive receiving end of the USB male connector is grounded through the first resistor, and the grounding end of the USB male connector is grounded.
4. The A-CAS communication circuit of claim 3 wherein the master control module comprises a master control chip, a card reading chip, and a second resistor,
the power end of the card reading chip is connected with the power end of the USB female head interface, the setting end of the card reading chip is connected with the negative data end of the USB female head interface, the clock end of the card reading chip is connected with the positive data end of the USB female head interface, the communication end of the card reading chip is connected with the negative receiving end of the USB female head interface, the detection end of the card reading chip is connected with the positive receiving end of the USB female head interface, the detection end of the card reading chip is further connected with a power supply through the second resistor, the main control chip is in communication connection with the card reading chip, and the grounding end of the USB female head interface is grounded.
5. The A-CAS communication circuit of claim 4 wherein the A-CAS module further comprises a display unit comprising a first light emitting diode and a second light emitting diode;
the positive pole of the first light-emitting diode is connected with the sending negative end of the USB male connector, the negative pole of the first light-emitting diode is grounded, the positive pole of the second light-emitting diode is connected with the sending positive end of the USB male connector, and the negative pole of the second light-emitting diode is grounded.
6. The a-CAS communication circuit according to claim 5, wherein the circuit further comprises a display control unit comprising a first transistor, a second transistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the base electrode of the first triode is connected with the first output end of the main control chip through the third resistor, the base electrode of the first triode is also connected with a power supply through the fourth resistor, the collector electrode of the first triode is connected with the sending negative end of the USB female connector, the collector electrode of the first triode is also connected with the power supply through the fifth resistor, and the emitter electrode of the first triode is grounded; the base of the second triode passes through the sixth resistance connection the second output end of the main control chip, the base of the second triode still passes through the seventh resistance connection power supply, the collector of the second triode is connected with the sending positive end of the USB female connector, the collector of the second triode still passes through the eighth resistance connection power supply, and the emitter of the second triode is grounded.
7. An A-CAS communication circuit control method applied to the A-CAS communication circuit as set forth in any one of claims 1-6, the method comprising:
storing, by the A-CAS module, a key to decrypt the media signal;
and receiving encrypted media information and a key for reading the decrypted media signal stored in the A-CAS module through a main control module, decrypting the encrypted media signal according to the key to obtain decrypted media information, and playing according to the decrypted media information.
8. The a-CAS communication circuit controlling method according to claim 7, wherein said steps of receiving, by the master control module, the encrypted media information and reading the key for decrypting the media signals stored in the a-CAS module are preceded by the steps of:
detecting whether the card is connected to the A-CAS module or not through a card reading chip;
and if the A-CAS module is not connected, the prompting operation is executed through the main control chip to prompt the user to insert the A-CAS module.
9. The a-CAS communication circuit controlling method according to claim 8, wherein the step of detecting whether or not to connect to the a-CAS module by means of the card reading chip further comprises, after the step of:
if the key is connected to the A-CAS module, executing reading operation and judging whether the key is read or not;
if the key is read, the key is sent to the main control chip, and a first control signal is sent to the display control unit through the main control chip, so that the display control unit sends a display signal to a second light-emitting diode according to the first control signal;
and receiving the display signal sent by the display control unit through a second light-emitting diode, and lightening the second light-emitting diode when the display signal is received.
10. An A-CAS communication apparatus comprising a housing and an A-CAS communication circuit configured as the A-CAS communication circuit of any one of claims 1-6.
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