CN103607548A - AV modulation output-tuning receiving integrated module group - Google Patents
AV modulation output-tuning receiving integrated module group Download PDFInfo
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- CN103607548A CN103607548A CN201310567501.3A CN201310567501A CN103607548A CN 103607548 A CN103607548 A CN 103607548A CN 201310567501 A CN201310567501 A CN 201310567501A CN 103607548 A CN103607548 A CN 103607548A
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Abstract
Disclosed in the invention is an AV modulation output-tuning receiving integrated module group comprising an AV modulation module and a tuning receiving module. The integrated module group is characterized in that a carrier signal is inputted into the AV modulation output-tuning receiving integrated module group and is filtered and amplified; the processed signal is transmitted to a power divider for signal distribution; one path of output of the power divider is connected to the tuning receiving module and the other path of output is connected to a signal mixer I and the output of the AV modulation module by an analog switch II for mixing and outputting, thereby realizing the function of the AV modulation output and the tuning receiving. According to the AV modulation output-tuning receiving integrated module group provided by the invention, the number of needed components is substantially reduced; the material cost is substantially lowered; the needed size is reduced; and the production complexity is also reduced. Meanwhile, the signal loss during the transmission process can be reduced. Moreover, the AV modulation output signal can be ensured not to enter an antenna or a wired television system by mistake, so that the product performance and applicability are substantially improved.
Description
Technical field
The present invention relates to electronic tuning unit and modulator, relate in particular to the integrated module of a kind of AV modulation tuning reception of output.
Background technology
In simulation and digital television signal transmitting procedure, for improving transmission quality and efficiency of transmission, the signal demand that is transmitted of different programs is modulated on the different channel of high frequency carrier with certain modulation system, on user terminal receiver, the corresponding carrier wave channel of program that needs are received, through amplification, frequency conversion, frequency-selective filtering, other channel carrier signal frequencies of filtering, corresponding channel carrier signal is transformed to the frequency of appointment, and this assigned frequency is carried out to demodulation, to reduce the radio frequency module that modulated signal realizes this function, be commonly referred to as high-frequency electronic tuner.
Modern household TV, except can being generally built-in with independent video (V) and audio frequency (A) input interface received RF wideband input signal carrier wave, to receive the signal from Set Top Box, DVD, game machine output.But part machine does not arrange independent video (V) and audio frequency (A) input adapter, can not directly receive audio frequency and video (AV) signal to other playback equipments, so common audio frequency and video (AV) signal need to be modulated to television carrier output with simulated television modulation system, television set receives this television carrier by built-in high-frequency electronic tuner, realizes television-viewing.AV modulator is realized this and common audio frequency and video (AV) signal is modulated to the function of television carrier output with simulated television modulation system.
Under some application requirements, equipment needs built-in high-frequency electronic tuner and AV modulator simultaneously.Traditional AV modulator and the tuner mode that is used in combination in Set Top Box is for the signal from antenna access is through the built-in tuner carrier wave of cable access Set Top Box input adapter C, the carrier signal of this input is divided into two, one road is from the logical out splice going splice D output of tuner ring, through Set Top Box external cable, the carrier wave input adapter A of the built-in AV modulator of reader top box, another road carrier input signal receives through amplifying frequency-selecting, become intermediate-freuqncy signal, by tuner pin, be exported to the demodulator circuit of Set Top Box; The video and audio signal of AV modulator from pin input from the output of Set Top Box decoding circuit, be modulated into after carrier wave, be mixed together with the carrier signal of carrying out the logical out splice going splice D of self-tuner ring of A joint input, the logical out splice going splice B output of ring from AV modulator, can be cascaded to the input of another Set Top Box, for the old-fashioned television set without built-in AV port, just directly access the antenna input port of television set, television set is by being switched to the carrier wave channel of modulators modulate, the channel program that direct viewing Set Top Box receives.The mode that this kind is used in combination needs larger spatial accommodation, cause equipment volume bigger than normal, production process is complicated simultaneously repeats, when user uses in reality, except accessing the cable of input carrier signal, also need a cable that the input of AV modulator carrier wave is connected to the logical output of high-frequency electronic tuner ring, use cost is high.
After this take the mode with tuning reception integrated design by AV modulation output, tuning reception need to be divided into three sections by VHF_LOW, VHF_HIGH, UHF by receive frequency range, by three partial circuits, carry out respectively after filtering, amplification, filtering, by three frequency mixers, carry out frequency conversion respectively, be transformed to fixing intermediate frequency, then export by sound table SAW FILTER filter; AV modulator is limited as 3/4 channel modulator; In signals transmission, being provided with three analog switches controls whole device and whether needs AV modulation output.Although this kind of integrated design reduces the corresponding mode that is used in combination of equipment volume to some extent, but components and parts are many, device cost is high, production assembling and debugging, test technology complexity, after adopting Surface Acoustic Wave Filter can make intermediate-freuqncy signal by filtering, Insertion Loss is large, AV modulation output channel only has 3/4 channel, can not meet application widely.Can not RF INPUT carrier input signal and modulated output signal all be exported by output port, respectively for old television set and another Set Top Box simultaneously.It is former because modulation output will be directly coupled to RF INPUT port, if RF INPUT signal comprises 3/4 channel signals, not only disturb tuning reception, and this modulated output signal will move back to antenna end or CATV transmission system by RF INPUT port, whole system is formed and disturbed.
Summary of the invention
The technical assignment of technical problem to be solved by this invention and proposition is that prior art is improved, provide a kind of AV modulation tuning reception of output integrated module, while solving in current technology simultaneously built-in high-frequency electronic tuner and AV modulator, components and parts are many, material cost is high, production assembling and debugging, test technology are complicated, intermediate-freuqncy signal by filtering after the large problem of Insertion Loss.
For solving above technical problem, technical scheme of the present invention is:
The integrated module of a kind of AV modulation tuning reception of output, comprise AV modulation module and tuning receiver module, it is characterized in that, after the integrated module of the carrier signal input AV modulation tuning reception of output first through a road filter and amplification, be transferred to again power splitter and carry out signal distribution, the output of power splitter Yi road is connected to tuning receiver module, and another road output is connected to signal mixer I and mixes rear output with the output of AV modulation module.By signal mixer, realize the former function that connects the outer, coaxial cable of high-frequency electronic tuner output and AV modulator input in mode that is used in combination, save a coaxial cable, reduced end user's use cost.And because reduced after two connectors of this root cable and correspondence, reduced the loss of signal in transmitting procedure, improved quality and receiving sensitivity.To be RF INPUT input signal just distribute in input former integrated design afterwards immediately, and filtering, enlarging function are designed in after power splitter, and between the required components and parts of this kind of connected mode, quantity is many, and material cost is high; And if export the carrier signal of AV modulation signal and RF INPUT input, will cause AV modulated output signal to be played a reversed role into antenna or cable TV signal system simultaneously; And the carrier signal of the present invention program input first through amplifier after by power splitter, distribute to signal mixer I again, amplifier has the effect of reverse isolation, while having guaranteed that mixing AV modulation output and input signal mix in signal mixer I, AV modulated output signal can not played a reversed role into antenna or cable television system, can not impact cable television system.
Further, described AV modulation module and tuning receiver module adopt same crystal, after resonance BUFFER, distribute, and are supplied to respectively the local oscillator L01 of AV modulation module and the local oscillator L02 of tuning receiver module.Can reduce like this phase interference between two local oscillator LO1 and LO2, keep the synchronous of local oscillator phase of output signal, also reduce components and parts simultaneously, reduce material cost.
Further, described tuning receiver module adopts digital filter to carry out intermediate frequency filtering, and can by controller II, adjust flexibly centre frequency, the bandwidth of digital filter, to connect the needs of different IF demodulation module after adapting to.
Further, between described power splitter and signal mixer I, be connected with analog switch II, between the output of AV modulation module and signal mixer I, be also connected with analog switch I.When using all-channel modulation, can first disconnect two analog switches, use tuning reception to carry out all-channel scanning to the signal of inputting by signal input connector, find unappropriated idle channels, by control bus, control controller I again, AV modulation output is arranged on to idle channels, be communicated with analog switch I and analog switch II, the signal that realization is exported from signal and the AV modulation of signal input connector input, after signal mixer 1 mixes, is exported from signal cascade out splice going splice simultaneously; If disconnection analog switch II just can realize AV modulated output signal and export separately; Be communicated with analog switch II, disconnect analog switch I, can realize from signal cascade out splice going splice and only exporting from the signal of signal input connector input.
Further, it is upper that described AV modulation module and tuning receiver module are integrated in same PCB, and device is in a metallic shield, and on metallic shield, device has a signal input connector to be connected with inner PCB with a signal cascade out splice going splice.Production process only need be carried out plug-in unit and the welding of Integratively, simplifies production process, improves components and parts operation stability, avoids connector to cause and disturbs and loss.
Further, described AV modulation module and tuning receiver module integrated rear share a bus on row's pin, power supply, etc. required connecting needle.AV modulation module and tuning receiver module share row's pin, have saved material cost, have also reduced the volume of the integrated module of the AV modulation tuning reception of output simultaneously, have reduced installation dimension and requisite space, can reduction equipment volume.
Further, between the output of AV modulation module and analog switch I, install filter I, add filter can effectively avoid the interference of AV modulated output signal to tuning reception.
Compared with prior art, the invention has the advantages that:
The integrated module of the AV modulation tuning reception of output of the present invention is integrated as a whole by AV modulator and high-frequency electronic tuner, realizes the function of AV modulation output and tuning reception simultaneously.Formerly need respectively two joints to amount to four connectors to be reduced to two; Formerly need respectively a crystal to amount to two to be reduced to one; Former two altogether of the circuit board PCB that need respectively, are reduced to a PCB; Formerly need respectively row's pin to amount to two, be reduced to one, integrated latter two function share bus on row's pin, power supply, etc. required connecting needle; Former two modules are for realizing the logical output function of ring separately, and each module needs independent amplifier and power splitter, integrated after, only need an amplifier and power splitter because reduced signals transmission link, promoted signal transmission quality; Former two modules need independent production, carry out respectively paster, assembling, test, inspection, now only carry out once, have reduced module production cost; Whole new design and former no matter independently two modules designs or original integrated design, its required component number greatly reduces, and material cost obtains very large reduction.Simultaneously because number of devices reduces, it is volume required also reduces, and production complexity also reduces, and production cost reduces.When reducing material cost, production cost, use cost, properties of product and applicability are greatly improved;
Owing to can selectively AV being modulated to output channel, be arranged on idle channels, from the signal of signal input connector A input, can mix with the channel of AV modulation output, can not produce interference each other, from signal cascade out splice going splice B, export.And owing to first passing through amplifier from signal input connector A input signal, the reverse isolation effect of this amplifier, also can guarantee that AV modulated output signal can not play a reversed role into antenna or cable television system, can not impact cable television system;
By intermediate frequency digital filter design, be variable intermediate frequency and bandwidth, make this design can adapt to more intermediate frequency demodulation requirement, applicability is strong flexibly;
After integrated, End-Customer in use, can save the logical output port of a connection modulator ring to the coaxial cable of tuner signal input port, reduced final use cost, and because reduced after two connectors of this root cable and correspondence, reduce the loss of signal in transmitting procedure, improved quality and receiving sensitivity.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is for adopting set up box structure schematic diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The integrated module of the disclosed a kind of AV modulation tuning reception of output of the embodiment of the present invention, integrated to realize, the function simultaneously with AV modulator and high-frequency electronic tuner, reduce component number, reduce material cost, reduction equipment volume, reduce the complexity of device fabrication process, enhance productivity, reduce the loss of signal in transmitting procedure, improving quality and receiving sensitivity is object.
As depicted in figs. 1 and 2, the integrated module of a kind of AV modulation tuning reception of output, comprise AV modulation module and tuning receiver module, AV modulation module and tuning receiver module are integrated on same PCB, device is in a metallic shield, on metallic shield, device has a signal input connector to be connected with inner PCB with a signal cascade out splice going splice, carrier signal is inputted by signal input connector, by being transferred to power splitter after filter II and amplifier, distribute successively, power splitter is divided into two-way by input signal, one tunnel output is connected with tuning receiver module, another road output is connected to signal mixer I, and connecting analog switch I I carrys out control switch between power splitter and signal mixer I, the output of AV modulation module is also connected on signal mixer I, and reconnect analog switch I and filter I between the output of AV modulation module and signal mixer I, the output of signal mixer I is connected to signal cascade out splice going splice.Carrier signal is inputted by signal input connector, by power splitter, be divided into two-way, one tunnel is transferred to tuning receiver module through frequency conversion, frequency-selective filtering, other channel carrier signal frequencies of filtering, corresponding channel carrier signal is transformed to the frequency of appointment, then output to and in master control, carry out AV demodulation and obtain vision signal and audio signal, vision signal and audio signal are transferred to again carries out video modulation and voice modulation in AV modulation module, AV modulation module is finally exported AV modulation signal and is mixed by being exported by signal cascade out splice going splice with the carrier signal of power splitter transmission in signal mixer I, whole process implementation the function of tuning reception and AV modulation output, the mode components and parts used of this kind of integrated design are few, take volume little, good stability.
AV modulating part not only can be used 3/4 channel modulation, can also realize all-channel modulation, when using all-channel modulation, can first disconnect two analog switches, use tuning reception to carry out all-channel scanning to the signal of inputting by signal input connector, find unappropriated idle channels, by control bus, control controller I again, AV modulation output is arranged on to idle channels, be communicated with analog switch I and analog switch II, the signal that realization is exported from signal and the AV modulation of signal input connector input is after signal mixer 1 mixes, from signal cascade out splice going splice, export simultaneously, if disconnection analog switch II just can realize AV modulated output signal and export separately, be communicated with analog switch II, disconnect analog switch I, can realize from signal cascade out splice going splice and only exporting from the signal of signal input connector input.
AV modulation module and tuning receiver module adopt same crystal, after resonance BUFFER, distribute, and are supplied to respectively the local oscillator L01 of AV modulation module and the local oscillator L02 of tuning receiver module, reduce the phase interference between two local oscillator LO1 and LO2.
Tuning receiver module adopts digital filter to carry out intermediate frequency filtering, and can by controller II, adjust flexibly centre frequency, the bandwidth of digital filter, to connect the needs of different IF demodulation module after adapting to.
AV modulation module and tuning receiver module integrated rear share a bus on row's pin, power supply, etc. required connecting needle.
Below be only the preferred embodiment of the present invention, it should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with claim limited range.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. the integrated module of tuning reception is exported in an AV modulation, comprise AV modulation module and tuning receiver module, it is characterized in that, after the integrated module of the carrier signal input AV modulation tuning reception of output first through a road filter and amplification, be transferred to again power splitter and carry out signal distribution, the output of power splitter Yi road is connected to tuning receiver module, and another road output is connected to signal mixer I and mixes rear output with the output of AV modulation module.
2. the integrated module of tuning reception is exported in AV modulation according to claim 1, it is characterized in that, described AV modulation module and tuning receiver module adopt same crystal, after resonance BUFFER, distribute, and are supplied to respectively AV modulation module and tuning receiver module.
3. the integrated module of tuning reception is exported in AV modulation according to claim 1, it is characterized in that, described tuning receiver module adopts digital filter to carry out intermediate frequency filtering, and can adjust flexibly by controller II centre frequency, the bandwidth of digital filter.
4. the integrated module of the AV modulation tuning reception of output according to claim 1, is characterized in that connecting analog switch I I between described power splitter and signal mixer I, connecting analog switch I between the output of AV modulation module and signal mixer I.
5. the integrated module of tuning reception is exported in AV modulation according to claim 1, it is characterized in that, described AV modulation module and tuning receiver module are integrated on same PCB, device is in a metallic shield, and on metallic shield, device has a signal input connector to be connected with inner PCB with a signal cascade out splice going splice.
6. the integrated module of the AV according to claim 1 modulation tuning reception of output, is characterized in that, described AV modulation module and tuning receiver module integrated rear share a bus on row's pin, power supply, etc. required connecting needle.
7. the integrated module of the AV modulation tuning reception of output according to claim 1, is characterized in that, between the output of AV modulation module and analog switch I, installs filter I.
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| CN201310567501.3A CN103607548B (en) | 2013-11-13 | 2013-11-13 | A kind of AV modulation output tuning receives integrated module |
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| CN201310567501.3A CN103607548B (en) | 2013-11-13 | 2013-11-13 | A kind of AV modulation output tuning receives integrated module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105578158A (en) * | 2016-02-29 | 2016-05-11 | 四川九洲智能装备有限公司 | Integrated cascadable optical fiber tuner module |
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| CN103607548B (en) | 2017-08-04 |
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