CN203675249U - Television signal receiving system - Google Patents
Television signal receiving system Download PDFInfo
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- CN203675249U CN203675249U CN201320783611.9U CN201320783611U CN203675249U CN 203675249 U CN203675249 U CN 203675249U CN 201320783611 U CN201320783611 U CN 201320783611U CN 203675249 U CN203675249 U CN 203675249U
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Abstract
The invention discloses a television signal receiving system, which comprises a digital-analog-integrated tuner, a system chip SOC and an audio-video processing unit. The audio-video processing unit is electrically connected with the digital-analog-integrated tuner, and one decoder is arranged in the audio-video processing unit. The system chip SOC is electrically connected with the digital-analog-integrated tuner and the audio-video processing unit respectively, and one demodulator is arranged in the system chip SOC. Wherein radio frequency signals are received and converted into intermediate digital signals or analog signals through the digital-analog-integrated tuner, the intermediate digital signals are demodulated into transport steams through the system chip SOC, and the audio-video processing unit receives the analog signals or transport steams and decodes the transport steams into the analog video signals and the analog audio signals. Accordingly, the television signal receiving system has both a digital signal receiving and processing function and traditional analog signal receiving and processing function.
Description
Technical field
The application relates to field of television, is specifically related to a kind of television signal receiving system.
Background technology
Along with the development of mechanics of communication, traditional simulated television cannot meet the watch demand of people to the TV programme becoming increasingly abundant gradually, and Digital Television has higher image and sound quality level compared to traditional simulated television, and can receive more TV programme and other digitlization messages, therefore, Digital Television incorporates in daily life gradually.
Current global digital television broadcasting system is divided into several standards haply, such as digital video broadcasting (DVB), advanced television standard committee (ATSC), integrated service digital broadcasting (ISDB) and Digital Television Terrestrial Broadcasting (DTMB) etc.But, current simulated television can not all turn-off within the short time, moreover, existing TV is mostly simulated television or the Digital Television that signal source is single, or realize by add a Set Top Box on simulated television the function of playing digital TV channel, easily take too many space, and in operation, user must be switched between different machines, extremely inconvenient.
Summary of the invention
Technical problems to be solved in this application are to provide a kind of television signal receiving system, switch the synergy of chip by digital analog integrated tuner, System on Chip/SoC SOC and audio frequency and video, allow the television signal receiving system have the function of reception and processing digital signal and traditional analog signal concurrently, thereby solved the problem that traditional tv can only external Set Top Box could be realized receiving digital signals.
In order to address the above problem, the application has disclosed a kind of television signal receiving system, comprises digital analog integrated tuner, audio frequency and video processing unit and System on Chip/SoC SOC.Audio frequency and video processing unit is electrically connected at digital analog integrated tuner, and the built-in decoder of audio frequency and video processing unit.System on Chip/SoC SOC is electrically connected at respectively digital analog integrated tuner and audio frequency and video processing unit, and the built-in demodulator of System on Chip/SoC SOC, wherein digital analog integrated tuner receives and changes radiofrequency signal into digital intermediate frequency signal or analog signal, System on Chip/SoC SOC receives digital intermediate frequency signal, and digital intermediate frequency signal is demodulated into transport stream, and audio frequency and video processing unit receives the analog signal that digital analog integrated tuner sends, or the transport stream that sends of receiving system chip SOC be analog video signal and simulated audio signal by transmission stream decoding.
Compared with prior art, the application can obtain and comprise following technique effect:
The application's television signal receiving system, by digital analog integrated tuner received RF signal, and is converted into digital intermediate frequency signal or mould signal frequently; By System on Chip/SoC, digital intermediate frequency signal is demodulated into transport stream by SOC; And be analog video signal and simulated audio signal by audio frequency and video processing unit by transport stream Xie Code, thereby realize the function receiving with processing digital signal.Therefore, the application's television signal receiving system except can receive with processing digital signal, also can receive and process traditional analog signal, thereby can take into account different rating demands, meanwhile, the application's television signal receiving system can be built in intelligent television completely, allows user not need configuration machine top box again can realize watching of digital television program, thereby quite easy in operation, and there is the advantages such as the space of saving.
Brief description of the drawings
Accompanying drawing described herein is used to provide further understanding of the present application, forms the application's a part, and the application's schematic description and description is used for explaining the application, does not form the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the block schematic diagram of the television signal receiving system of the application the first embodiment.
Fig. 2 is the flow chart that the application's the first method is implemented the television signal receiving method of aspect.
Fig. 3 is the flow chart that the application's the second method is implemented the television signal receiving method of aspect.
Fig. 4 is the flow chart that the application's third method is implemented the television signal receiving method of aspect.
Fig. 5 is the block schematic diagram of the television signal receiving system of the application the second embodiment.
Fig. 6 is the flow chart that the cubic method of the application is implemented the television signal receiving method of aspect.
Embodiment
To coordinate drawings and Examples to describe the application's execution mode in detail below, by this application's implementation procedure how application technology means solve technical problem and reach technology effect can be fully understood and be implemented according to this.
Censure specific components as used some vocabulary in the middle of specification and claim.Those skilled in the art should understand, and hardware manufacturer may be called same assembly with different nouns.This specification and claims are not used as distinguishing the mode of assembly with the difference of title, but the difference in function is used as the criterion of distinguishing with assembly.If " comprising " mentioned in the middle of specification and claim is in the whole text an open language, therefore should be construed to " comprise but be not limited to "." roughly " refer to that in receivable error range, those skilled in the art can solve the technical problem within the scope of certain error, reach described technique effect substantially.In addition " couple ", or " electric connection " word comprises directly any and electric property coupling means indirectly at this.Therefore, be coupled to one second device if describe a first device in literary composition, represent that described first device can directly be electrically coupled to described the second device, or be indirectly electrically coupled to described the second device by other devices or the means that couple.Specification subsequent descriptions is to implement the application's preferred embodiments, and right described description is to illustrate that the application's rule is object, not in order to limit the application's scope.The application's protection range is when being as the criterion depending on the claims person of defining.
Also it should be noted that, in this application, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, commodity or the system that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, commodity or system.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, commodity or the system that comprises described key element and also have other identical element.
Please refer to Fig. 1, the disclosed television signal receiving system 10 of the application the first embodiment comprises: digital analog integrated tuner 110, System on Chip/SoC SOC120 and audio frequency and video processing unit 130.
Digital analog integrated tuner 110 comprises radio frequency (RF) front-end circuit, this circuit comprises low noise amplifier, tracking band-pass filter, preconditioned circuit, mixting circuit, the first intermediate frequency (IF) treatment circuit, the second processing circuitry of intermediate frequency and digital front-end circuit etc., wherein, processing circuitry of intermediate frequency comprises variable gain amplifier.In addition, digital analog integrated tuner 110 has a signaling interface 111, in order to pass through cable received RF signal.And the function of digital analog integrated tuner 110 is integrated tuning analog signal and digital signal, in order to receive the radiofrequency signals such as the digital signal of traditional analog signal and increasingly extensive use, and is converted into digital intermediate frequency signal IF; Or be converted to analog signal, for example analog video signal CVBS and simulated audio signal SIF.
System on Chip/SoC SOC120 is electrically connected at digital analog integrated tuner 110, and System on Chip/SoC SOC120 is built-in with demodulator, in order to receive after digital intermediate frequency signal IF at System on Chip/SoC SOC120, after system synchronization, signal demodulation, inverse fourier transform, inverse discrete fourier transform, error correction solution rock, deinterleaving etc. are processed, be transport stream serial or parallel (Transport Stream by digital intermediate frequency signal IF demodulation (demod), TS), and by transport stream send to audio frequency and video processing unit 130.
Audio frequency and video processing unit 130 is electrically connected at respectively digital analog integrated tuner 110 and System on Chip/SoC SOC120, and be built-in with decoder in audio frequency and video processing unit 130, it can be but be not limited to multiple format video decoder and audio decoder, multiple format video decoder can be supported the MPEG-2 of SD form, H.264 flow with AVS, and audio decoder can be supported MPEG-1, MPEG-2, the forms such as MPEG-2AAC and Dolby Digital AC-3.Therefore, audio frequency and video processing unit 130 is in order to receive after transport stream, by demultiplexing, merging, decompression and audio frequency and video format conversion supervisor, be standard compliant audio-video signal by transport stream Xie Code (decode), for example, by transport stream Xie Code for meeting Digital Television Terrestrial Broadcasting (Digital Terrestrial Multimedia Broadcast, analog video signal YPbPr and the simulated audio signal L/R of audio/video encoding standard (Audio Video coding Standard, AVS) DTMB).
The reception and the processing that by a method enforcement aspect, the disclosed television signal receiving system of the application the first embodiment are realized to TV signal are below described further.
Please refer to Fig. 1 and Fig. 2, the application's the first method is implemented the disclosed television signal receiving method of aspect and is comprised the following steps:
Step S110, be converted to digital intermediate frequency signal IF or analog signal (for example analog video signal CVBS and simulated audio signal SIF) by digital analog integrated tuner 110 received RF signals and by radiofrequency signal, if wherein signal is analog video signal CVBS and simulated audio signal SIF, digital analog integrated tuner 110 sends it to audio frequency and video processing unit 130 and carries out subsequent treatment; Otherwise if signal is digital intermediate frequency signal IF, this digital intermediate frequency signal IF is sent to System on Chip/SoC SOC120 by digital analog integrated tuner 110;
Step S120, is demodulated into transport stream (TS) by System on Chip/SoC SOC120 by digital intermediate frequency signal IF; And
Step S130, receive analog signal (for example analog video signal CVBS and simulated audio signal SIF) by audio frequency and video processing unit 130 from digital analog integrated tuner 110, or receive transport stream and be decoded as analog video signal and simulated audio signal from System on Chip/SoC SOC120.
Wherein, System on Chip/SoC SOC120 receives after digital intermediate frequency signal IF, by above-mentioned demodulation process, digital intermediate frequency signal IF is demodulated into serial or parallel transport stream, and then sends transport stream to audio frequency and video processing unit 130.Now, audio frequency and video processing unit 130 receives transport stream, and by decoding programs such as demultiplexing, merging, decompression and audio frequency and video format conversion, transport stream is converted to analog video signal YPbPr and simulated audio signal L/R, thereby allow television signal receiving system realize reception and the processing of digital signal (for example DTMB signal), and have reception and the processing capacity of analog signal and digital signal concurrently.
What deserves to be explained is, in the present embodiment, audio frequency and video processing unit 130 can also optionally be built-in with an audio operational amplifier and a video filter, audio operational amplifier is in order to carry out filtering and to amplify and process to simulated audio signal L/R, video filter is in order to analog video signal YPbPr is carried out to RCL filtering processing, thereby avoids simulated audio signal L/R and analog video signal YPbPr to have noise jamming.
Please refer to Fig. 1 and Fig. 3, therefore, implement the television signal receiving method of aspect compared to the first method, implement in aspect in the application's the second method, video processing unit 130 is built-in with audio operational amplifier and video filter, therefore in television signal receiving method corresponding thereto, receive analog video signal CVBS and simulated audio signal SIF at audio frequency and video processing unit 130, or receive transport stream and be decoded as analog video signal YPbPr and the step of simulated audio signal L/R after, also comprise:
Step S140, carries out filtering processing by video filter to analog video signal CVBS or analog video signal YPbPr; And
Step S150, is carried out filtering and amplifies the steps such as processing simulated audio signal SIF or simulated audio signal L/R by audio operational amplifier.
Switch chip 130 to analog video signal CVBS and simulated audio signal SIF afterwards, then by audio frequency and video; Or analog video signal YPbPr and simulated audio signal L/R switches and the subsequent treatment such as distribution, thereby allow television signal receiving system realize reception and the processing of digital signal (for example DTMB signal), and have reception and the processing capacity of analog signal and digital signal concurrently.
In addition,, in other embodiment of the application, can also between digital analog integrated tuner 110 and System on Chip/SoC SOC120, be electrically connected an automatic gain control circuit (AGC) and/or an I
2c bus.
Automatic gain control circuit is in order to detect digital intermediate frequency signal IF, to adjust the amplitude of digital intermediate frequency signal IF and the digital intermediate frequency signal IF after adjusting is fed back to System on Chip/SoC SOC120 according to testing result is corresponding.Automatic gain control circuit is the gain of control amplifier automatically, it makes the constant and impact that not changed by incoming signal level of the Level hold of output signal, the wherein gain of automatic gain control circuit major control intermediate frequency amplifier or high-frequency amplifier, make the output of digital analog integrated tuner 110 not because input signal strength changes suddenly, namely produce the direct voltage (AGC voltage) of a respective change along with the variation of input signal amplitude, utilize this voltage to go to control a kind of multiplication factor a kind of attenuation of variable attenuation circuit (or control) of variable gain amplifier, in the time that input signal amplitude is larger, the multiplication factor of AGC voltage control variable gain amplifier reduces (or increasing variable attenuation circuit attenuation), and when input signal amplitude hour, the multiplication factor of AGC voltage control variable gain amplifier increases (or reducing variable attenuation circuit attenuation), thereby reaches the basicly stable object of amplitude output signal.
I
2the tuned frequency that C bus arranges in order to the digital analog integrated tuner 110 of initialization and transfer system chip SOC120 is to digital analog integrated tuner 110, make digital analog integrated tuner 110 lock corresponding receiving channels (tuning) according to tuned frequency, and from receiving channels received RF signal.Afterwards, digital analog integrated tuner 110 is exported to System on Chip/SoC SOC120 by the digital intermediate frequency signal IF after conversion again, thus the program of settling signal locking and output digital intermediate frequency signal IF.
Please refer to Fig. 1 and Fig. 4, therefore, implement the television signal receiving method of aspect compared to the first method, implement in the disclosed television signal receiving method of aspect in the application's third method, further comprising the steps of in the process that receives and change radiofrequency signal:
Step S101, System on Chip/SoC SOC120 passes through I
2the digital analog integrated tuner 110 of C bus initialization and transmission tuned frequency are to digital analog integrated tuner 110; And
Step S102, digital analog integrated tuner 110 locks corresponding receiving channels according to the tuned frequency arranging, and from receiving channels received RF signal.
Afterwards, digital analog integrated tuner 110 completes radiofrequency signal again and is converted to digital intermediate frequency signal IF or analog video signal CVBS and simulated audio signal SIF, and digital intermediate frequency signal IF is exported to System on Chip/SoC SOC120, thereby the program of settling signal locking and output digital intermediate frequency signal IF.
Meanwhile, radiofrequency signal be converted to the operation of digital intermediate frequency signal IF or analog video signal CVBS and simulated audio signal SIF and digital intermediate frequency signal IF be demodulated between the operation of transport stream, further comprising the steps of:
Step S111, detects digital intermediate frequency signal IF by automatic gain control circuit, and according to the corresponding amplitude of adjusting digital intermediate frequency signal IF of testing result; And
Step S112, is delivered to System on Chip/SoC SOC120 by the digital intermediate frequency signal IF after adjusting.
Then, then by System on Chip/SoC SOC120 be demodulated into transport stream.
As shown in Figure 5, the framework of the application the second embodiment and the first embodiment is roughly the same, difference is between the two, the disclosed television signal receiving system 20 of the application the second embodiment switches chip 230 except having digital analog integrated tuner 210, System on Chip/SoC SOC220 and audio frequency and video, also comprises automatic gain control circuit (AGC) 240 and I
2 c bus 250.
Automatic gain control circuit 240 and I
2 c bus 250 is electrically connected at respectively between digital analog integrated tuner 210 and System on Chip/SoC SOC220.Automatic gain control circuit 240 is in order to detecting digital intermediate frequency signal IF, according to the corresponding amplitude of adjusting digital intermediate frequency signal IF of testing result, for example, in the time that the intensity of digital intermediate frequency signal IF is weak, amplify digital intermediate frequency signal IF, and the digital intermediate frequency signal IF after adjusting is outputed to System on Chip/SoC SOC220.
I
2 c bus 250 is in order to digital analog integrated tuner 210 described in initialization, and the tuned frequency that transfer system chip SOC220 arranges is to digital analog integrated tuner 210, make digital analog integrated tuner 210 lock a receiving channels according to tuned frequency, and from receiving channels received RF signal, thereby reach the effect of tuning and locking signal.
Based on above-mentioned framework, digital analog integrated tuner 210 is responsible for the reception of digital signal, and program search passes through I by System on Chip/SoC SOC220
2 c bus 250 is controlled, and after digital analog integrated tuner 210 is logged on to a TV channel, is responsible for output digital intermediate frequency signal IF to System on Chip/SoC SOC220.Then, System on Chip/SoC SOC220 receives after digital intermediate frequency signal IF, and digital intermediate frequency signal IF is demodulated into transport stream, and sends transport stream to audio frequency and video processing unit 230.Afterwards, then carry out decoding program by audio frequency and video processing unit 230, digital intermediate frequency signal IF is converted to analog video signal YPbPr and simulated audio signal L/R, thereby realize reception and the processing capacity of digital signal.
The reception and the processing that by a method enforcement aspect, the disclosed TV signal module of the application the second embodiment are realized to TV signal are below described further.
Please refer to Fig. 5 and Fig. 6, the cubic method of the application is implemented the disclosed television signal receiving method of aspect, comprises the following steps:
Step S310, System on Chip/SoC SOC220 passes through I
2the C bus digital analog integrated tuner 210 of 250 initialization and transmission tuned frequency are to digital analog integrated tuner 210;
Step S320, digital analog integrated tuner 210 locks corresponding receiving channels according to the tuned frequency arranging, and from receiving channels received RF signal;
Step S330, radiofrequency signal is converted to digital intermediate frequency signal IF or analog video signal CVBS and simulated audio signal SIF by digital analog integrated tuner 210, wherein, if signal is analog video signal CVBS and simulated audio signal SIF, digital analog integrated tuner 210 sends it to audio frequency and video switching chip 230 and carries out subsequent treatment; Otherwise if signal is digital intermediate frequency signal IF, digital analog integrated tuner 210 sends this digital intermediate frequency signal IF to System on Chip/SoC SOC220;
Step S340, detects digital intermediate frequency signal IF by automatic gain control circuit 240, and according to the corresponding amplitude of adjusting digital intermediate frequency signal IF of testing result;
Step S350, exports the digital intermediate frequency signal IF after adjusting to System on Chip/SoC SOC220;
Step S360, is demodulated into transport stream (TS) by System on Chip/SoC SOC220 by digital intermediate frequency signal IF;
Step S370, receives analog video signal CVBS and simulated audio signal SIF by audio frequency and video processing unit 230, or receives transport stream be analog video signal YPbPr and simulated audio signal L/R by transmission stream decoding; And
Step S380, by audio frequency and video processing unit 230 to analog video signal CVBS and simulated audio signal SIF, or analog video signal YPbPr and simulated audio signal L/R switch and distribute, thereby realize the function that has reception and Analog signals and digital signal concurrently.
The embodiment that it will be understood by those skilled in the art that the application can be provided as method, system or computer program.Therefore, the application can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the application can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
Above-mentioned explanation illustrates and has described some preferred embodiments of the application, but as previously mentioned, be to be understood that the application is not limited to disclosed form herein, should not regard the eliminating to other embodiment as, and can be used for various other combinations, amendment and environment, and can, in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the spirit and scope that the change that those skilled in the art carry out and variation do not depart from the application, all should be in the protection range of the application's claims.
Claims (5)
1. a television signal receiving system, is characterized in that, comprising:
Digital analog integrated tuner;
Audio frequency and video processing unit, a built-in decoder, described audio frequency and video processing unit is electrically connected at described digital analog integrated tuner; And
System on Chip/SoC SOC, a built-in demodulator, described System on Chip/SoC SOC is electrically connected at respectively described digital analog integrated tuner and described audio frequency and video processing unit;
Wherein, described digital analog integrated tuner receives and changes radiofrequency signal into digital intermediate frequency signal or analog signal, described System on Chip/SoC SOC receives described digital intermediate frequency signal, and described digital intermediate frequency signal is demodulated into transport stream, and described audio frequency and video processing unit receives the described analog signal that described digital analog integrated tuner sends, or receive the described transport stream that described System on Chip/SoC SOC sends and be analog video signal and simulated audio signal by described transmission stream decoding.
2. television signal receiving system as claimed in claim 1, is characterized in that, also comprises:
Automatic gain control circuit, is electrically connected between described digital analog integrated tuner and described System on Chip/SoC SOC.
3. television signal receiving system as claimed in claim 1, is characterized in that, also comprises:
I
2c bus, is electrically connected between described digital analog integrated tuner and described System on Chip/SoC SOC.
4. television signal receiving system as claimed in claim 1, is characterized in that, described audio frequency and video processing unit also comprises audio operational amplifier and video filter, is electrically connected respectively System on Chip/SoC SOC described in what.
5. television signal receiving system as claimed in claim 1, is characterized in that,
Described digital intermediate frequency signal is digital television ground broadcast signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320783611.9U CN203675249U (en) | 2013-11-29 | 2013-11-29 | Television signal receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320783611.9U CN203675249U (en) | 2013-11-29 | 2013-11-29 | Television signal receiving system |
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| CN203675249U true CN203675249U (en) | 2014-06-25 |
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| CN201320783611.9U Expired - Fee Related CN203675249U (en) | 2013-11-29 | 2013-11-29 | Television signal receiving system |
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