CN101193218A - TV set for receiving digital signals and analog signals - Google Patents
TV set for receiving digital signals and analog signals Download PDFInfo
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- CN101193218A CN101193218A CNA2006100702989A CN200610070298A CN101193218A CN 101193218 A CN101193218 A CN 101193218A CN A2006100702989 A CNA2006100702989 A CN A2006100702989A CN 200610070298 A CN200610070298 A CN 200610070298A CN 101193218 A CN101193218 A CN 101193218A
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Abstract
The invention discloses a TV set which can receive both a digital signal and an analog signal and aims to provide the TV set with a function of simultaneously receiving both the digital signal and the analog signal. The invention comprises a main chip used for decoding a video signal, a digital-analog integration high frequency tuner module and a digital demodulator. The digital-analog integration high frequency tuner module receives the digital and analog TV signals from a TV station. The digital TV signal is processed by a digital processing module inside the TV set to generate a differential digital IF signal, and the IF signal is then outputted to the digital demodulator for demodulating; and then a digital transmitting stream signal is generated from the demodulating and is outputted to the main chip for decoding. The analog TV signal is processed in an analog signal processing module inside the high frequency tuner module to generate an analog CVBS signal and a second sound signal; the analog CVBS signal is outputted directly to the main chip for decoding; and the second sound signal is outputted to a sound processing circuit processing and then drives a loudspeaker to generate sound.
Description
Technical field
The invention belongs to technical field of television sets, relate to a kind of improvement of TV set circuit, specifically, relate to a kind ofly can receive the DVB-T ground digital signal that TV station sends and the treatment circuit of analog signal simultaneously.
Background technology
Along with popularizing of digital signal, the whole world is all in the process of carrying out the digitlization transmission, and it is slower that the present digital signal in Europe is popularized the relative U.S., but compare still very fast relatively with other places.Britain has had about 30% user to watch Digital Television now, and other countries have also all planned digital signal point switching time of oneself.In order to adapt to the demand in market, require television set can receive digital video broadcast-terrestrial DVB-T signal, and simultaneously this digital signal is carried out digital demodulation, receive, handle to realize the DVB-T ground digital signal that TV station is sent.Because the TV signal that the part RAI sends has digital signal and analog signal simultaneously, therefore, need the television set reception and the broadcast of two kinds of signals of compatibility simultaneously.At present, the method of head it off generally all is that two tuners are set on television set, one is used for receiving the digital signal that TV station sends, another is used for receiving analog signal, cause the TV set circuit integrated level low, it is big to take the complete machine space, and the user uses comparatively problem such as trouble.If can only both can receive analog signal with a tuner, again can demodulated digital signal, then not only can improve the integrated level and the stability of TV set circuit, the while again can be user-friendly.Therefore, how designing a kind of so digital-analog integrated receiving processing circuit, is that present television set is made one of subject matter that industry needs to be resolved hurrily.
Summary of the invention
The present invention need use two tuners to receive respectively that the circuit level that is brought is low, big problem takes up room in order to solve in the prior art anolog TV signals and digital television signal, a kind of novel receiving digital signals simultaneously and the television set of analog signal are provided, adopt digital-analog integrated tuner module to cooperate digital demodulator, receive and processing capacity when having realized anolog TV signals and digital television signal, effectively simplify circuit structure, improved the integrated level of TV set circuit.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
But the television set of a kind of receiving digital signals and analog signal, comprise master chip, digital-analog integrated tuner module and digital demodulator that decoding video signal is handled, described digital-analog integrated tuner module receives digital television signal and the anolog TV signals that TV station sends, digital television signal generates differential digital intermediate-freuqncy signal by its inner digital signal processing module and outputs to and carry out demodulation in the described digital demodulator, and then generates the digital transport stream signal and output to and carry out decoding processing in the described master chip; After the simulation process resume module of anolog TV signals by digital-analog integrated tuner inside modules, generate the simulation CVBS signal and second accompanying sound intermediate frequency signal; Wherein, simulation CVBS signal directly outputs to and carries out decoding processing in the described master chip; After second accompanying sound intermediate frequency signal outputs to and handles in the sound accompaniment treatment circuit, drive loud speaker output sound accompaniment.
Wherein, after described digital demodulator carried out demodulation to the differential digital intermediate-freuqncy signal of input, generation TS stream signal outputed to and carries out the MPEG-2 decoding in the described master chip; The vision signal that will generate after described master chip will be decoded outputs in the follow-up television set convergent-divergent circuit by its output to be handled, and then realizes that the output of vision signal shows.
In order to realize the reliable transmission of data between digital-analog integrated tuner module, digital demodulator and the master chip three, bus end SCL, the SDA of described digital-analog integrated tuner module are through I
2The C bus connects first group of bus end of described digital demodulator; Described digital demodulator outputs to the TS stream signal that demodulation generates in the described master chip by its second group of bus end, and exports effective control signal, the initial control signal of data and reseting controling signal to master chip; Described digital demodulator connects master chip by its 3rd group of bus end, realizes the both-way communication of control command signal between digital demodulator and the master chip.Wherein, in second group of bus end of described digital demodulator, data terminal is to master chip output TS flow data signal, and clock end is to the transmission rate of master chip outputting data signals.
In order to realize the free adjustment of image gain, the gain signal output of described digital demodulator connects the automatic gain control end of described digital-analog integrated tuner module through rc filter circuit, to described digital-analog integrated tuner module passback multiplication factor control signal.The differential digital intermediate-freuqncy signal output of described digital-analog integrated tuner module connects the input of described digital demodulator respectively through capacitance, to guarantee the reliability of differential digital intermediate-freuqncy signal transmission.
The digital television signal that described digital-analog integrated tuner module receives is a digital video broadcast-terrestrial DVB-T signal, and connected digital demodulator is a ground DTV demodulator.Being built-in with a voltage switch in described digital-analog integrated tuner module, is that digital signal or analog signal are switched between the digital processing circuit of portion and two passages of analog processing circuit automatically within it according to the TV signal that receives.
Compared with prior art, advantage of the present invention and good effect are: the present invention is by being provided with digital-analog integrated tuner module and digital demodulator in television set inside, receive the decode processing when adopting a tuner promptly to realize digital television signal and anolog TV signals, not only simplified line construction, dwindled the circuit volume, and the high-quality of effectively having guaranteed digital signal and analog signal is exported, greatly improved the stability of system's operation, provide assurance television set complete machine quality.
Description of drawings
But Fig. 1 is the TV set circuit schematic diagram of receiving digital signals and analog signal among the present invention.
Embodiment
The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
But the receiving digital signals proposed by the invention and the television set of analog signal, comprise master chip, digital-analog integrated tuner module and digital demodulator that decoding video signal is handled, described digital-analog integrated tuner module receives digital television signal and the anolog TV signals that TV station sends, digital television signal generates differential digital intermediate-freuqncy signal by its inner digital signal processing module and outputs to and carry out demodulation in the described digital demodulator, and then generates the digital transport stream signal and output to and carry out decoding processing in the described master chip; After the simulation process resume module of anolog TV signals by digital-analog integrated tuner inside modules, generate the simulation CVBS signal and second accompanying sound intermediate frequency signal; Wherein, simulation CVBS signal directly outputs to and carries out decoding processing in the described master chip; After second accompanying sound intermediate frequency signal outputs to and handles in the sound accompaniment treatment circuit, drive loud speaker output sound accompaniment.
Embodiment one, receive and playing function when realizing television set to ground digital video broadcast signal DVB-T and analog signal, it is that the digital-analog integrated tuner module U01 of FQ1216 receives DVB-T digital video broadcast-terrestrial signal and the analog signal that TV station sends that the present invention adopts model.Wherein, the DVB-T digital television signal generates the differential digital intermediate-freuqncy signal by the digital signal processing module of digital-analog integrated tuner module U01 inside, output to model and be among the ground DTV digital demodulator N15 of ZL10353 and carry out demodulation, and then generate TS stream signal and output to and carry out decoding processing in the follow-up master chip; After the simulation process resume module of anolog TV signals by digital-analog integrated tuner module U01 inside, generate the simulation CVBS signal and second accompanying sound intermediate frequency signal.Wherein, simulation CVBS signal directly outputs to and carries out decoding processing in the described master chip; After second accompanying sound intermediate frequency signal outputs to and handles in the sound accompaniment treatment circuit, drive loud speaker output sound accompaniment.Described master chip is original video decode processing main chip in the TV set circuit, TS stream signal to digital demodulator N15 output carries out the MPEG-2 decoding, the simulation CVBS signal of digital demodulator N15 output is simulated the 3D decoding, and the vision signal that generates of the back of will decoding outputs to by its output and carries out convergent-divergent in the follow-up television set convergent-divergent circuit and handle, and then realizes that the output of video frequency program shows.
In described digital-analog integrated tuner module U01, be built-in with a voltage switch, according to the TV signal that receives is that DVB-T digital signal or analog signal are switched between the digital signal processing module of portion and two passages of simulation process module automatically within it, realizes the processing respectively of digital signal and analog signal.Concrete annexation between described digital-analog integrated tuner module U01 and the digital demodulator N15 is referring to shown in Figure 1.
Among Fig. 1, feeder ear 3 pin of described digital-analog integrated tuner module U01,13 pin are respectively through LC filter network connection+5V DC power supply, for the operate as normal of digital-analog integrated tuner module U01 provides stable operating voltage.Inside at described digital-analog integrated tuner module U01 includes the DC-DC booster circuit, only need provide 5V voltage, can satisfy the power demands of its internal digital signal processing module and analog module.4,5 pin of digital-analog integrated tuner module U01 are respectively the total stitch of SCL, SDA, through I
2The C bus connects wherein a group of bus end CLK2, DATA2 of described digital demodulator N15.In order to ensure reliability of data transmission, at described I
2Be connected with respectively on the C bus on the current potential by pull-up resistor R632, R631 connection+5V DC power supply and draw branch road.6 pin of described digital-analog integrated tuner module U01 are automatic gain control pin IF AGC, connect the gain signal output pin AGC1 of described digital demodulator N15 by rc filter circuit R627, C639.When carrying out gain controlling, digital demodulator N15 realizes effective adjusting of image gain to the 6 pin passback multiplication factor control signal of described digital-analog integrated tuner module U01.7,8 pin of described digital-analog integrated tuner module U01 are differential digital intermediate-freuqncy signal output pin DIF, connect differential signal input 30,31 pin of described digital demodulator N15 respectively through capacitance C680, C678.After described digital demodulator N15 carries out analog to digital to the differential digital signal that receives conversion, sampling, correction etc. are handled, the TS stream signal of output serial or parallel, TS stream signal is MPEG-2 form image encoded and sound accompaniment stream signal, needs the rear end master chip that the output that it carries out MPEG-2 decoding back realization video and audio signal is play.
Wherein, described digital demodulator N15 with annexation between the master chip is: digital demodulator N15 by the unidirectional universal serial bus end of one group MDO0, MOCLK respectively through resistance R P24B, RP24A be connected corresponding of serial data receiving terminal with clock end with master chip.Wherein, give described master chip by the TS stream signal that generates after the digital demodulator N15 demodulation by its bus data end MDO0 high-speed transfer; The speed of transmission data is by the bus clock end MOCLK output of digital demodulator N15.In order to realize the reliable communicating of data between digital demodulator N15 and the master chip, export effective control signal, the initial control signal of data (indicate from which data and begin effectively) and reseting controling signal by MOVAL end, MOSTRT end and the RESET end of digital demodulator N15 to master chip respectively.Other one group of I of digital demodulator N15
2C bus end DATA1, CLK1 connect the I of described master chip respectively through resistance R 614, R613
2The C bus end, the both-way communication of control command signal between realization digital demodulator N15 and the master chip.Described master chip passes through I
2When the total demand pairs word of C demodulator N15 carries out the write order operation,, then directly write the register address of digital demodulator N15 if digital demodulator N15 is operated; Logarithmic mode integral high frequency head module U01 operates if desired, then need be when writing digital demodulator N15 register address, write the address of digital-analog integrated tuner module U01, can realize the operation registers of logarithmic mode integral high frequency head module U01 like this, thereby functions such as platform are searched in the selection, gain controlling, the selection of video standard, the selection and the internal digital phase-locked loop numeral of bandwidth that realize the sound accompaniment standard.
By after its inner simulation process resume module, generation simulation CVBS signal directly outputs to by its 12 pin and carries out the 3D decoding processing in the described master chip described digital-analog integrated tuner module U01 with its anolog TV signals that receive; 11 pin of second accompanying sound intermediate frequency signal that generates by digital-analog integrated tuner module U01 output to through capacitance C77 and carry out in the sound accompaniment treatment circuit driving loud speaker output television field frame after audio handles.
The present invention has realized the function that DVB-T digital signal and analog radio-frequency signal adopt a tuner can finish reception, handle by adopting above-mentioned simple circuit configuration, effectively simplified circuit structure, improved the integrated level of TV set circuit, saved the complete machine cost of tv product, can in consumer electronics product, be used widely.
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention 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 invention also should belong to protection scope of the present invention.
Claims (9)
1. but the television set of receiving digital signals and analog signal comprises the master chip that decoding video signal is handled; It is characterized in that: also include digital-analog integrated tuner module and digital demodulator, described digital-analog integrated tuner module receives digital television signal and the anolog TV signals that TV station sends, digital television signal generates differential digital intermediate-freuqncy signal by its inner digital signal processing module and outputs to and carry out demodulation in the described digital demodulator, and then generates the digital transport stream signal and output to and carry out decoding processing in the described master chip; After the simulation process resume module of anolog TV signals by digital-analog integrated tuner inside modules, generate the simulation CVBS signal and second accompanying sound intermediate frequency signal; Wherein, simulation CVBS signal directly outputs to and carries out decoding processing in the described master chip; After second accompanying sound intermediate frequency signal outputs to and handles in the sound accompaniment treatment circuit, drive loud speaker output sound accompaniment.
2. but the television set of receiving digital signals according to claim 1 and analog signal, it is characterized in that: after described digital demodulator carries out demodulation to the differential digital intermediate-freuqncy signal of input, generation TS stream signal outputs to and carries out the MPEG-2 decoding in the described master chip, and then connects the convergent-divergent circuit of television set by the output of described master chip.
3. but the television set of receiving digital signals according to claim 1 and 2 and analog signal is characterized in that: bus end SCL, the SDA of described digital-analog integrated tuner module are through I
2The C bus connects first group of bus end of described digital demodulator; Described digital demodulator outputs to the TS stream signal that demodulation generates in the described master chip by its second group of bus end; Described digital demodulator connects master chip by its 3rd group of bus end, realizes the both-way communication of control command signal between digital demodulator and the master chip.
4. but the television set of receiving digital signals according to claim 3 and analog signal, it is characterized in that: in second group of bus end of described digital demodulator, data terminal is to master chip output TS flow data signal, and clock end is to the transmission rate of master chip outputting data signals.
5. but the television set of receiving digital signals according to claim 1 and analog signal, it is characterized in that: the gain signal output of described digital demodulator connects the automatic gain control end of described digital-analog integrated tuner module through rc filter circuit, to described digital-analog integrated tuner module passback multiplication factor control signal.
6. but the television set of receiving digital signals according to claim 1 and analog signal is characterized in that: the differential digital intermediate-freuqncy signal output of described digital-analog integrated tuner module connects the input of described digital demodulator respectively through capacitance.
7. but according to the television set of claim 1 or 2 or 3 described receiving digital signals and analog signal, it is characterized in that: described digital demodulator is exported effective control signal, the initial control signal of data and reseting controling signal to master chip.
8. but the television set of receiving digital signals according to claim 1 and 2 and analog signal, it is characterized in that: the digital television signal that described digital-analog integrated tuner module receives is a digital video broadcast-terrestrial DVB-T signal, and connected digital demodulator is a ground DTV demodulator.
9. but the television set of receiving digital signals according to claim 8 and analog signal, it is characterized in that: being built-in with a voltage switch in described digital-analog integrated tuner module, is that digital signal or analog signal are switched between the digital processing circuit of portion and two passages of analog processing circuit automatically within it according to the TV signal that receives.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100702989A CN100473125C (en) | 2006-11-21 | 2006-11-21 | TV set for receiving digital signals and analog signals |
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| CNB2006100702989A CN100473125C (en) | 2006-11-21 | 2006-11-21 | TV set for receiving digital signals and analog signals |
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| CN101193218A true CN101193218A (en) | 2008-06-04 |
| CN100473125C CN100473125C (en) | 2009-03-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621647B (en) * | 2009-07-17 | 2010-12-29 | 广州易迩达电子有限公司 | Three-in-one tuner with compatibility of DVB-T/C and ATV |
| CN101510969B (en) * | 2009-02-26 | 2011-04-06 | 四川长虹电器股份有限公司 | Analog digital television integrated system and switching method thereof |
| CN101742137B (en) * | 2008-11-19 | 2011-09-28 | 上海雅利电子有限公司 | Control circuit for integral high frequency head between digital cable television and digital terrestrial television |
| CN103686011A (en) * | 2013-11-29 | 2014-03-26 | 乐视致新电子科技（天津）有限公司 | Television signal receiving module and method |
-
2006
- 2006-11-21 CN CNB2006100702989A patent/CN100473125C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101742137B (en) * | 2008-11-19 | 2011-09-28 | 上海雅利电子有限公司 | Control circuit for integral high frequency head between digital cable television and digital terrestrial television |
| CN101510969B (en) * | 2009-02-26 | 2011-04-06 | 四川长虹电器股份有限公司 | Analog digital television integrated system and switching method thereof |
| CN101621647B (en) * | 2009-07-17 | 2010-12-29 | 广州易迩达电子有限公司 | Three-in-one tuner with compatibility of DVB-T/C and ATV |
| CN103686011A (en) * | 2013-11-29 | 2014-03-26 | 乐视致新电子科技（天津）有限公司 | Television signal receiving module and method |
| WO2015078416A1 (en) * | 2013-11-29 | 2015-06-04 | 乐视致新电子科技（天津）有限公司 | Television signal receiving module and receiving method |
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| Publication number | Publication date |
|---|---|
| CN100473125C (en) | 2009-03-25 |
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Address after: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266071 Shandong city of Qingdao province Jiangxi City Road No. 11 Patentee before: HISENSE ELECTRIC Co.,Ltd. |