CN201986053U - Digital demodulation system and television adopting same - Google Patents
Digital demodulation system and television adopting same Download PDFInfo
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- CN201986053U CN201986053U CN2011200957128U CN201120095712U CN201986053U CN 201986053 U CN201986053 U CN 201986053U CN 2011200957128 U CN2011200957128 U CN 2011200957128U CN 201120095712 U CN201120095712 U CN 201120095712U CN 201986053 U CN201986053 U CN 201986053U
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Abstract
The utility model discloses a digital demodulation system and a television adopting the digital demodulation system. The digital demodulation system comprises a demodulator, a high-frequency head and a main processor, wherein the high-frequency head is used for receiving satellite signals received by an antenna and carrying out conversion processing on the satellite signals, the demodulator comprises a signal input end and a data output end, the demodulator is connected with the high-frequency head and the main processor through a bus, receives control signals sent by the main processor and controls the high-frequency head according to the control signals, and the demodulator receives conversion signals output by the high-frequency head through the signal input end and outputs signal streams to the main processor through the data output end after demodulating and decoding the conversion signals. The digital demodulation system simultaneously conforms to two standards DVB-S and DVB-S2 and simultaneously supports two demodulation modes QPSK and 8PSK, the receiving speed is improved, in addition, the system integration degree is high, the performance is stable, and the occupied space is small.
Description
Technical field
The utility model belongs to data communication and processing technology field, specifically, relates to a kind of digital demodulation system that satellite-signal is handled.
Background technology
At present, satellite digital TV demodulation scheme DVB-S is a kind of satellite digital TV demodulation scheme of the nineties exploitation in last century, along with development of technology, DVB-S2 is about to put into effect as satellite digital broadcasting standard of new generation, present employed satellite digital TV demodulator circuit generally only is applicable to the DVB-S demodulation scheme, and this brings bigger restriction obviously for the application of satellite digital TV; In having the television system of satellite receiving function, because the television set inner space is limited, its integrated level is had relatively high expectations, if, obviously can be subjected to the restriction of television set inner space condition in television set by the equipment that is applicable to DVB-S and two kinds of standards of DVB-S2 is set simultaneously.
In addition, the DVB-S demodulation scheme is not supported the phase-shift keying of 8PSK(octal system) modulation system, transmission rate is slow, transmission capacity is little, its performance can not satisfy the demand of satellite digital TV system.
Based on this, how to research and develop a kind of satellite demodulating system, support the satellite digital TV demodulation scheme of DVB-S and two kinds of standards of DVB-S2 simultaneously, and support the QPSK(quarternary phase-shift keying (QPSK) simultaneously), the 8PSK demodulation mode, be technical problem underlying to be solved in the utility model.
Summary of the invention
The utility model is not supported the problem of DVB-S and two kinds of satellite digital TV demodulation schemes of DVB-S2 simultaneously in order to solve existing digital demodulating circuit, a kind of digital demodulation system is provided, can support two kinds of demodulation schemes of DVB-S and DVB-S2 simultaneously, simple in structure, be easy to realize.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of digital demodulation system, comprise demodulator, be used for satellite-signal that reception antenna receives and the tuner and the primary processor of its conversion process, described demodulator comprises signal input part and data output end, described demodulator connects tuner and primary processor by bus, receive the control signal that primary processor sends, and control described tuner according to control signal; Described demodulator receives the switching signal of described tuner output by signal input part, and will flow to described primary processor by the data output end output signal behind its demodulation sign indicating number.
Wherein, described demodulator can adopt a high-performance digital demodulation chip that meets DVB-S and DVB-S2 standard to realize, is the satellite digital TV demodulation chip of AVL6211 such as model.
Further, described digital demodulation system also is included as the LNB controller that tuner provides polarizing voltage, described digital demodulation chip sends by its LNB control end and is used for the described LNB controller of controlling signal to of control output voltage value, with the magnitude of voltage of control to described tuner input.
The satellite-signal that tuner receiving chamber outside antenna is received because the outdoor signal more complicated so preferably between described LNB controller and tuner voltage protection circuit is set, prevents the interference of external signal, guarantees the operate as normal of tuner.
Further again, described digital demodulation chip is used for the regulation voltage of control transformation signal amplitude to described tuner output by its automatic gain control end, can adjust the power of described tuner output signal in real time, make it remain on the normal amplitude scope.
Further again, after described tuner receives satellite-signal, convert thereof into the base band differential signal or the single-ended i/q signal that can receive for the digital demodulation chip, and export switching signal to the digital demodulation chip, after described demodulator carried out digital demodulation, decoding processing with switching signal, the TS signal flow of output MPEG was to primary processor.
Based on above-mentioned digital demodulation system, the utility model discloses the television set that adopts this digital demodulation system simultaneously, comprise the digital demodulation system and the audio frequency and video module that are connected with antenna, it is characterized in that: described digital demodulation system comprises demodulator, be used for satellite-signal that reception antenna receives and with the tuner of its conversion process, and primary processor, described demodulator comprises signal input part and data output end, described demodulator connects tuner and primary processor by bus, receive the control signal that primary processor sends, and control described tuner according to control signal; Described demodulator receives the switching signal of described tuner output by signal input part, and will flow to described primary processor by the data output end output signal behind its demodulation sign indicating number, and described primary processor is sent to the audio frequency and video module after signal flow is handled.
Compared with prior art, advantage of the present utility model and good effect are: digital demodulation system of the present utility model is handled the satellite-signal that tuner received and changed by adopting the digital demodulation techniques that meets DVB-S and DVB-S2 standard simultaneously; And support two kinds of demodulation modes of QPSK, 8PSK simultaneously, satisfy the demand of satellite digital broadcasting standard of new generation to signal processing system.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the schematic block circuit diagram of a kind of embodiment of a kind of digital demodulation system that proposes of the utility model and the television set that adopts this system.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is done explanation in further detail.
The utility model generally only is applicable to the DVB-S demodulation scheme in order to solve existing satellite digital TV demodulator circuit, and can not be applicable to the problem of satellite digital broadcasting standard DVB-S2 demodulation scheme of new generation simultaneously, a kind of digital demodulation system is provided, has met the demodulation scheme of DVB-S and two kinds of standards of DVB-S2 simultaneously; This digital demodulating system integrated level height, it is little to take up room, and is easy to realize; And according to the test result demonstration, systematic function is stable.
Be example with the television set that adopts this digital demodulating system below, elaborate the concrete establishment structure and the operation principle of described digital demodulation system.
Embodiment one, the television set of present embodiment comprises digital demodulation system and audio frequency and video module, described digital demodulation system comprises demodulator, tuner, and primary processor, the satellite-signal received of tuner reception antenna wherein, and after it is carried out conversion process, send switching signal to described demodulator, referring to shown in Figure 1, wherein, demodulator can adopt a high-performance digital demodulation chip U1 who meets DVB-S and two kinds of standards of DVB-S2 simultaneously to realize, such as model is the satellite digital TV demodulation chip of AVL6211, and digital demodulation chip U1 supports QPSK simultaneously, two kinds of demodulation modes of 8PSK.Described digital demodulation chip U1 comprises signal input part and data output end, digital demodulation chip U1 connects tuner U2 and primary processor U3 by bus (such as the I2C bus), receive the control signal that primary processor U3 sends, and control described tuner U2 according to control signal, described control signal control command that to be primary processor U3 send according to user instruction and address instruction etc.The satellite-signal that tuner U2 is received according to the control signal reception antenna, and be converted into the switching signal that digital demodulation chip U1 can receive, signal input part by digital demodulation chip U1 sends to described digital demodulation chip U1 then, and digital demodulation chip U1 carries out the demodulation sign indicating number with switching signal to be handled the back and exports primary processor by its data output end to the form of signal flow, final described primary processor is sent to the audio frequency and video module after signal flow is handled, and carries out audio frequency and video output.
Described primary processor U3 also can pass through the state of bus (such as the I2C bus) control figure demodulation chip U1, for example, by being connected with SLEEP, LOCK, the RESET pin of digital demodulation chip U1 respectively, the transmit control signal corresponding state of the described digital demodulation chip U1 of control guarantees that it exports normal signal flow.
Described digital demodulation system also comprises LNB controller U4, for tuner U2 provides required polarizing voltage, the polarization in the sts satellite transmission system generally comprises perpendicular polarization and horizontal polarization, both polarizing voltages are in different size, for example the value of relatively often using is 13/18V, 14/19V etc., described digital demodulation chip U1 sends the control signal of control output voltage value to LNB controller U4 by its LNB control end LNB-CNTRL_0 or LNB-CNTRL_1, with the magnitude of voltage of control, for tuner U2 provides desired polarized voltage to described tuner U2 output.
Tuner U2 is used to receive the satellite-signal of receiving with the switch room outside antenna; because outdoor signal more complicated; so preferably between described LNB controller U4 and tuner U2, voltage protection circuit P1 is set; prevent the interference of external signal; guarantee the operate as normal of tuner U2; described voltage protection circuit P1 can adopt the more needed primary elements of protective circuit to build, and also can adopt integrated components and parts such as voltage protector to realize.
Described digital demodulation chip U1 is used for the regulation voltage of control transformation signal amplitude to described tuner U2 output by its automatic gain control end RFAGC, and then the multiplication factor of regulating tuner U2 internal amplifier, the voltage amplitude of the switching signal of its output is remained on the normal amplitude scope, thereby greatly improved the quality of tuner U2 output signal.
Wherein, described tuner U2 is converted into the switching signal that digital demodulation chip U1 can receive with the satellite-signal that receives, switching signal can be the base band differential signal, such as TUNER_IP, TUNER_IN, TUNER_QP, TUNER_QN, data output end MPEG_VALID by digital demodulation chip U1 after perhaps single-ended i/q signal, digital demodulation chip U1 receive the base band differential signal and carry out digital demodulation, decoding processing exports primary processor U3 to the form of signal flow.Described digital demodulation chip U1 receives described base band differential signal by its signal input part ADC_IP, ADC_IN, ADC_QP, ADC_QN, as a specific embodiment, described decoding process can adopt the FEC(Forward Error Correction that is applicable to the modern multimedia digital video-frequency broadcast standard) decoding, described signal flow is the TS stream of MPEG.
The digital demodulation system of present embodiment meets the reception of DVB-S and two kinds of standard satellite digital TVs of DVB-S2 by adopting above-mentioned simple circuit configuration, satisfies the demand of satellite digital broadcasting standard of new generation to signal processing system; Support two kinds of demodulation modes of QPSK, 8PSK simultaneously, effectively improved receiving velocity; The level of integrated system height, it is little to take the television set inner space.This digital demodulating system can be widely used in the satellite-signal audio frequency and video receiving equipments such as television set, set-top box.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. digital demodulation system, it is characterized in that: comprise demodulator, be used for satellite-signal that reception antenna receives and the tuner and the primary processor of its conversion process, described demodulator comprises signal input part and data output end, described demodulator connects tuner and primary processor by bus, receive the control signal that primary processor sends, and control described tuner according to control signal; Described demodulator receives the switching signal of described tuner output by signal input part, and will flow to described primary processor by the data output end output signal behind its demodulation sign indicating number.
2. digital demodulation system according to claim 1 is characterized in that: described demodulator is a digital demodulation chip.
3. digital demodulation system according to claim 2, it is characterized in that: described digital demodulation system also is included as the LNB controller of tuner power supply, and described digital demodulation chip sends by its LNB control end and is used for the described LNB controller of controlling signal to of control output voltage value.
4. digital demodulation system according to claim 3 is characterized in that: also be connected with voltage protection circuit between described LNB controller and tuner.
5. according to the described digital demodulation system of each claim of claim 1-4, it is characterized in that: described digital demodulation chip is used for the regulation voltage of control transformation signal amplitude to described tuner output by its automatic gain control end.
6. digital demodulation system according to claim 5, it is characterized in that: described tuner is base band differential signal or single-ended i/q signal to the switching signal of the signal input part output of described demodulator, and the signal flow of described demodulator output is the TS signal flow of MPEG.
7. television set, comprise the digital demodulation system and the audio frequency and video module that are connected with antenna, it is characterized in that: described digital demodulation system comprises demodulator, be used for satellite-signal that reception antenna receives and with the tuner and the primary processor of its conversion process, described demodulator comprises signal input part and data output end, described demodulator connects tuner and primary processor by bus, receive the control signal that primary processor sends, and control described tuner according to control signal; Described demodulator receives the switching signal of described tuner output by signal input part, and will flow to described primary processor by the data output end output signal behind its demodulation sign indicating number, and described primary processor is sent to the audio frequency and video module after signal flow is handled.
8. television set according to claim 7 is characterized in that: described demodulator is a digital demodulation chip.
9. television set according to claim 8, it is characterized in that: described digital demodulation system also is included as the LNB controller of tuner power supply, and described digital demodulation chip sends by its LNB control end and is used for the described LNB controller of controlling signal to of control output voltage value; Between described LNB controller and tuner, also be connected with voltage protection circuit.
10. according to the described television set of each claim of claim 7-9, it is characterized in that: described digital demodulation chip is used for the regulation voltage of control transformation signal amplitude to described tuner output by its automatic gain control end; Described tuner is base band differential signal or single-ended i/q signal to the switching signal of the signal input part output of described demodulator, and the signal flow of described demodulator output is the TS signal flow of MPEG.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200957128U CN201986053U (en) | 2011-04-02 | 2011-04-02 | Digital demodulation system and television adopting same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200957128U CN201986053U (en) | 2011-04-02 | 2011-04-02 | Digital demodulation system and television adopting same |
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| Publication Number | Publication Date |
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| CN201986053U true CN201986053U (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200957128U Expired - Fee Related CN201986053U (en) | 2011-04-02 | 2011-04-02 | Digital demodulation system and television adopting same |
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| CN (1) | CN201986053U (en) |
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2011
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20140402 |