RU168100U1 - DEVICE FOR RECEIVING AND PROCESSING A DIGITAL TV SIGNAL - Google Patents

Abstract

The invention relates to devices for receiving and processing digital television signals, in particular for connecting to a personal computer. The technical result of the utility model is the possibility of receiving and processing satellite and cable television signals of standards covering almost all countries, namely DVB-T / T2, DVB-S / S2, DVB-C / C2, ATSC, ISDB-T, DMB- T / H, in dual channel mode. A device for receiving and processing a digital television signal contains the first 1 and second 2 tuners, the first 3 and second 4 demodulation blocks, a control circuit 5, a computer interface 6, the first 7 and second 8 interfaces of the Common Interface type. 10 s.p. f-ly, 2 ill.

Description

The invention relates to devices for receiving and processing digital television signals, in particular for connecting to a personal computer and with support for most of the digital broadcasting standards used.

The following terms and abbreviations are used throughout the text.

RF input - high-frequency input for connecting, for example, a coaxial cable.

FPGA - programmable logic integrated circuit.

Decoder - a device for converting an analog signal to digital.

Demodulator is a device for recovering information from a modulated carrier signal.

A tuner is a device that receives a radio frequency signal and converts the selected frequency to a fixed one for further conversion.

I2C is a serial data bus for integrated circuit communication using two bi-directional communication lines.

PCMCIA is a specification for expansion modules, which is also used in the Common Interface for CAM modules.

Common Interface (CI) - a connection interface for electronic modules, which allows you to view encoded radio and television channels when connecting CAM modules.

CAM-module - a standard adapter plugged into the CI-slot for connecting closed channel decoding cards.

PCI-e (PCI Express) is a computer bus using the PCI bus software model and a high-performance physical protocol based on serial data transfer.

DVB (Digital Video Broadcasting) is a family of digital television standards.

A device is known from the description of CN 2865162, which contains an audio / video decoder chip, a demodulator, a tuner connected via an I2C bus, and an analog video switch.

A device is also known from the description of patent CN 103281573, containing a PCMCIA interface, FPGA, tuner, decoder and PCI-e interface.

However, these devices do not provide coverage for all the most popular television signal standards.

The closest analogue of the claimed utility model is the technical solution described in the text of patent CN 100576903. The device is designed to receive signals of DVB, POD, HIS, DMB standards and containing PCMCIA interface, control circuit, tuner, decoder and PCI-e interface.

However, this solution is single-channel, which does not show how the reception and processing of signals of all the declared standards is ensured.

The technical problem to which the claimed utility model is directed is the lack of devices that provide two-channel reception and processing of television signals of most of the standards used, which cover almost all countries of the world.

The technical result of the utility model is the possibility of receiving and processing satellite and cable television signals of standards covering almost all countries, namely DVB-T / T2, DVB-S / S2, DVB-C / C2, ATSC, ISDB-T, DMB- T / H, in dual channel mode.

This technical result is achieved due to the fact that the device for receiving and processing a digital television signal containing a first high-frequency input, a first tuner, a first demodulation unit, a control circuit, a first Common Interface type interface and a computer interface further comprises a second high-frequency input, a second tuner , the second demodulation unit and the second Common Interface type interface, the first and second demodulation units are capable of demodulating DVB-T / T2, DVB-S / S2, DVB-C / C2, ATSC, ISDB-T and DMB-T / H standards the first you okochastotny input sequentially connected to the first tuner, a first demodulator circuit and a control computer interface, the second high-frequency input connected to a second series tuner, a second demodulator, a control circuit and a computer interface, and the first and second types of Common Interface interfaces connected to the control circuit.

The control circuit can be made in the form of a programmable logic integrated circuit (FPGA).

In this case, the FPGA can be made in the form of an integrated circuit ALTERA Cyclone IV EP4CGX22CF19.

Then the ALTERA Cyclone IV EP4CGX22CF19 integrated circuit software can be written in the VHDL programming language.

The computer interface may be of the PCI-e type.

The first and second demodulation units may comprise a CXD2854ER integrated circuit for demodulating the DVB-T / T2, DVB-C / C2, DVB-S / S2 and ISDB-T standards.

The first and second demodulation units may also comprise an LGDT3306A integrated circuit for ATSC demodulation.

The first and second demodulation units may comprise an ATBM8881 integrated circuit for demodulating the DMB-T / H standard.

The first and second tuners can be made on the basis of the integrated circuit CXD2858ER.

The first and second tuners may contain a multiplexer.

In this case, the multiplexer can be made on the basis of the integrated circuit ADG918.

The inventive device allows you to simultaneously receive and process two satellite or cable signals due to two RF inputs and two interfaces of the Common Interface type, while ensuring coverage of all popular broadcasting standards due to the demodulation unit with demodulators of DVB-T / T2, DVB-S / S2 standards, DVB-C / C2, ATSC, ISDB-T and DMB-T / H, which makes the claimed device a universal board for watching TV.

In addition, the dual interface allows you to save PCI-e slots, thus occupying only one of them while supporting two digital channels simultaneously.

The best embodiment of the claimed utility model is shown in the figure, in which positions 1-8 indicate:

1 - first tuner;

2 - second tuner;

3 - the first block of demodulation;

4 - the second block of demodulation;

5 is a control diagram;

6 - computer interface;

7 - the first interface of type Common Interface;

8 - second interface type Common Interface.

The photo shows the appearance of the claimed device.

A device for receiving and processing a digital television signal contains the first 1 and second 2 tuners, the first 3 and second 4 demodulation blocks, a control circuit 5, a computer interface 6, the first 7 and second 8 interfaces of the Common Interface (CI) type. The first 1 and second 2 tuners contain a multiplexer (not shown in FIG.).

The first RF input of the device is connected in series with the first tuner 1 through the multiplexer, then with the first demodulation unit 3, the FPGA control circuit 5 and the computer interface 6. The latter in this case is PCI-e, but USB or any type can be used another serial interface.

The second RF input of the device is also connected in series with the second tuner 2 through the multiplexer, then with the second demodulation unit 4, the FPGA control circuit 5 and the computer interface 6.

The first 7 and second 8 CI type interfaces are connected to the FPGA control circuit 5.

The first and second RF inputs are made in the form of an F-type connector for a coaxial cable.

The PCMCIA CI specification is used to connect external decryption modules (Viaccess, Irdeto, Conax, etc.).

The first 3 and second 4 demodulation blocks contain demodulator integrated circuits for processing the following standards.

DVB-T / T2 is the standard for digital terrestrial (cable) broadcasting in Europe, Asia and Australia.

DVB-S / S2 is the global standard for digital satellite broadcasting.

DVB-C / C2 is the worldwide standard for digital terrestrial broadcasting.

ATSC is a set of standards for digital television broadcasting over the air, cable, and satellite networks, primarily in North America.

ISDB-T is the broadcast standard in Brazil, Latin America and Japan.

DMB-T / H is the standard for broadcast and mobile broadcasting in China.

As an FPGA, an ALTERA Cyclone IV EP4CGX22CF19 integrated circuit with software in the VHDL programming language was selected.

For demodulation of DVB-T / T2, DVB-C / C2, DVB-S / S2 and ISDB-T standards, the integrated circuit CXD2854ER was selected, for ATSC - LGDT3306A, for DMB-T / H - ATBM8881.

The first 1 and second 2 tuners can be made on the basis of the integrated circuit CXD2858ER with a multiplexer based on the integrated circuit ADG918.

The first 7 and second 8 CI interfaces are physically represented by a dual PCMCIA slot, a power supply for 5 V CAM modules, a capacitive current and load short-circuit current limiter (500 mA for each CAM module, TPS2042 integrated circuit) and six LCH245A trigger assemblies, which save the number of lines of interaction with the control circuit 5 on the FPGA due to the formation of common and bidirectional tires.

The device operates as follows.

In the PCMCIA slot of the first CI interface 7 for decoding video content, a CAM module is inserted, which is controlled by the FPGA control circuit 5. The satellite or cable signal is fed to the first RF input, then to the multiplexer, which, depending on the type of signal, sends it to the input of the first tuner 1 for satellite or the input of the first tuner 1 for cable signals. After processing the signal by the first tuner, the signal enters the first block 3 demodulation. The choice of the input of the first 1 tuner and the required demodulator in the first block 3 of demodulation is carried out using the control circuit 5 on the FPGA. Information is exchanged with the FPGA control circuit 5 via the I2C bus. The processed and decoded signal is sent to a personal computer using the PCI-e computer interface 6, after which it can be displayed or processed in any other way.

The second channel with the second tuner 2, the second demodulation unit 4, the control circuit 5, the computer interface 6 and the second CI type interface 8 works in a similar way.

Management and switching between channels is also carried out by the control circuit 5.

The given example is a special case and does not exhaust all possible implementations of the utility model.

Claims (11)

1. A device for receiving and processing a digital television signal containing a first high-frequency input, a first tuner, a first demodulation block, a control circuit, a first Common Interface type interface and a computer interface, characterized in that it contains a second high-frequency input, a second tuner, a second demodulation block , and a second interface of the Common Interface type, the first and second demodulation units are capable of demodulating the standards DVB-T / T2, DVB-S / S2, DVB-C / C2, ATSC, ISDB-T and DMB-T / H, while the first high-frequency input is connected in series with the first a tuner, a first demodulator, a control circuit and a computer interface, a second high-frequency input is connected in series with a second tuner, a second demodulator, a control circuit and a computer interface, and the first and second interfaces of the Common Interface type are connected to a control circuit. 2. The device according to p. 1, characterized in that the control circuit is made in the form of a programmable logic integrated circuit. 3. The device according to p. 2, characterized in that the programmable logic integrated circuit is made in the form of an integrated circuit ALTERA Cyclone IV EP4CGX22CF19. 4. The device according to p. 3, characterized in that the software of the integrated circuit ALTERA Cyclone IV EP4CGX22CF19 is written in the programming language VHDL. 5. The device according to claim 1, characterized in that the computer interface is PCI-e type. 6. The device according to p. 1, characterized in that the first and second demodulation units contain an integrated circuit CXD2854ER for demodulation of standards DVB-T / T2, DVB-C / C2, DVB-S / S2 and ISDB-T. 7. The device according to p. 1, characterized in that the first and second demodulation blocks contain an integrated circuit LGDT3306A for demodulation of the ATSC standard. 8. The device according to claim 1, characterized in that the first and second demodulation units comprise an ATVM8881 integrated circuit for demodulating the DMB-T / H standard. 9. The device according to p. 1, characterized in that the first and second tuners are based on the integrated circuit CXD2858ER. 10. The device according to p. 1, characterized in that the first and second tuners contain a multiplexer. 11. The device according to p. 10, characterized in that the multiplexer is based on an integrated circuit ADG918.

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