CN103607548B - A kind of AV modulation output tuning receives integrated module - Google Patents
A kind of AV modulation output tuning receives integrated module Download PDFInfo
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- CN103607548B CN103607548B CN201310567501.3A CN201310567501A CN103607548B CN 103607548 B CN103607548 B CN 103607548B CN 201310567501 A CN201310567501 A CN 201310567501A CN 103607548 B CN103607548 B CN 103607548B
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- modulation
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Abstract
The present invention discloses a kind of AV modulation output tuning and receives integrated module, including AV modulation modules and tuning receiving module, it is characterized in that, carrier signal input AV modulation output tunings first pass through filter and amplification all the way after receiving integrated module, power splitter is transferred to again carries out signal distribution, the output all the way of power splitter is connected to tuning receiving module, another road output is connected to after signal mixer I is mixed with the output of AV modulation modules by analog switch II to be exported, so as to realize the function that AV modulation output tunings are received.Component number needed for AV modulation output tuning of the present invention receives integrated module greatly reduces, material cost obtains very big reduction, required volume is reduced, produce complexity reduction, loss of the signal in transmitting procedure is reduced simultaneously, and ensure that AV modulation output signals will not play a reversed role into antenna or cable television system, properties of product and applicability are greatly improved.
Description
Technical field
Integrated mould is received the present invention relates to electronic tuning unit and modulator, more particularly to a kind of AV modulation output tunings
Group.
Background technology
In simulation and digital television signal transmitting procedure, to improve transmission quality and efficiency of transmission, the quilt of different programs
Transmission signal needs to be modulated on the different channel of high frequency carrier with certain modulation system, on user terminal receiver, will
The carrier channel corresponding to the program of reception is needed, by amplification, frequency conversion, frequency-selective filtering, other channel carrier frequencies are filtered out, will
Correspondence channel carrier signal transforms to the frequency specified, and the assigned frequency is demodulated, and this is realized to reduce the signal modulated
The radio frequency module of function is commonly referred to as high-frequency electronic tuner.
Modern household TV, single video is typically built-in with addition to it can receive rf broadband input signal carrier wave（V）With
Audio（A）Input interface, to receive the signal exported from set top box, DVD, game machine.But part machine is simultaneously not provided with individually
Video（V）And audio（A）Input adapter, it is impossible to directly receive and come to the audio frequency and video of other playback equipments（AV）Signal, so
Need common audio frequency and video（AV）Signal is modulated to television carrier output with simulated television modulation system, and television set passes through built-in
High-frequency electronic tuner receives this television carrier, realizes television-viewing.AV modulators realize this by common audio frequency and video（AV）Signal
The function of television carrier output is modulated to simulated television modulation system.
Under some application requirements, equipment needs built-in high-frequency electronic tuner and AV modulators simultaneously.Traditional AV is adjusted
The mode that is applied in combination of device and tuner processed in set top box is that the signal accessed from antenna accesses tune built in set top box through cable
Humorous device carrier wave input adapter C, the carrier signal of the input is divided into two, and is exported all the way from tuner loop-through output joint D, warp
Set top box external cable, the carrier wave input adapter A of AV modulators built in input set top box, another road carrier input signal is amplified
Frequency-selecting is received, and as intermediate-freuqncy signal, the demodulator circuit of set top box is exported to by tuner pin；AV modulators are defeated from pin
Enter from set top box decoding circuit export video and audio signal, be modulated into after carrier wave, with A joints input carry out self-tuning
Device loop-through output joint D carrier signal is mixed together, and is exported from the loop-through output joint B of AV modulators, can be cascaded to another
The input of one set top box, for the old-fashioned television set without built-in AV ports, is just directly accessed the antenna input port of television set,
Television set is by switch to the carrier channel of modulators modulate, the channel program that direct viewing set top box is received.Such a combination makes
Mode needs larger receiving space, causes equipment volume bigger than normal, while production process complexity is repeated, user actually makes
Used time, the cable except needing access input carrier signal, in addition it is also necessary to which the input of AV modulators carrier wave is connected to high-frequency electrical by one
The cable of sub- tuner loop-through output, use cost is high.
Hereafter take and AV is modulated into the mode that output receives integrated design with tuning, tuning reception is needed receives frequency
Scope is three sections by VHF_LOW, VHF_HIGH, UHF point, after being filtered, amplified respectively by three partial circuits, filter, is distinguished
Frequency conversion is carried out by three frequency mixers, fixed intermediate frequency is transformed to, then export by sound table SAW FILTER wave filters；AV is modulated
General ability is limited to 3/4 channel modulator；Three analog switches are provided with signals transmission to control whether whole device needs
Want AV modulation outputs.Although such a integrated design has reduced the corresponding mode that is applied in combination of equipment volume, but first device
Part is more, and device cost is high, production assembling and debugging, test technology complexity, intermediate-freuqncy signal can be passed through using SAW filter
Insertion Loss is big after filtering, and AV modulation output channels only have 3/4 channel, it is impossible to meet widely application.Can not be simultaneously by RF
INPUT carrier input signals and modulation output signal are all exported by output port, respectively for old television set and another
Set top box is used.Reason will be directly coupled to RF INPUT ports for modulation output, if RF INPUT signals include 3/4 channel
Signal, not only interference tuning is received, and the modulation output signal will move back to antenna end or wired by RF INPUT ports
Television transmission system, is disturbed whole system formation.
The content of the invention
The technical problems to be solved by the invention and the technical assignment proposed are to be improved that there is provided one kind to prior art
AV modulation output tunings receive integrated module, when solving in current technology built-in high-frequency electronic tuner and AV modulators simultaneously
Component is more, and material cost is high, and production assembling and debugging, test technology are complicated, intermediate-freuqncy signal asking greatly by Insertion Loss after filtering
Topic.
To solve above technical problem, the technical scheme is that：
A kind of AV modulation output tuning receives integrated module, including AV modulation modules and tuning receiving module, its feature
It is, carrier signal input AV modulation output tunings first pass through filter and amplification all the way after receiving integrated module, then are transferred to work(
Device is divided to carry out signal distribution, the output all the way of power splitter is connected to tuning receiving module, and another road output is connected to signal mixing
Device I is exported after being mixed with the output of AV modulation modules.Original is realized by signal mixer be applied in combination in mode and connect high frequency
Electronic tuning unit output end and the function of the outer, coaxial cable of AV modulator inputs, save a coaxial cable, reduce
The use cost of end user.And because reducing after this root cable and corresponding two connectors, signal is reduced in biography
Loss during defeated, improves quality and receiving sensitivity.Former integrated design is RF INPUT input signals
Just distributed immediately after input, filtering, enlarging function are designed in after power splitter, number between the component needed for such a connected mode
Amount is more, and material cost is high；And if the carrier signal that output AV modulated signals and RF INPUT are inputted simultaneously, will cause AV to adjust
Output signal processed is played a reversed role into antenna or cable TV signal system；And the carrier signal of the present invention program input first passes through amplification
Again signal mixer I is distributed to by power splitter after device, amplifier has the effect of reverse isolation, it is ensured that mixing AV modulation is defeated
Go out when being mixed with input signal in signal mixer I, AV modulation output signals will not play a reversed role into antenna or cable television system,
Cable television system will not be impacted.
Further, described AV modulation modules and tuning receiving module use same crystal, by resonance BUFFER
After be allocated, be respectively supplied to AV modulation modules local oscillator L01 and tuning receiving module local oscillator L02.It can so reduce
Phase interference between two local oscillators LO1 and LO2, keeps the synchronization of local oscillator phase of output signal, while also reducing first device
Part, reduces material cost.
Further, described tuning receiving module carries out intermediate frequency filtering using digital filter, and can pass through control
The centre frequency of digital filter, bandwidth is adjusted flexibly in device II, the need for adapting to be followed by different IF demodulation module.
Further, the defeated of analog switch II, AV modulation module is connected between described power splitter and signal mixer I
Go out and analog switch I is also associated between signal mixer I.When being modulated using all-channel, it can first disconnect two simulations and open
Close, received using tuning and all-channel scanning is carried out to the signal inputted by signal input connector, find the unappropriated free time
Channel, then controller I is controlled by controlling bus, AV modulation outputs are arranged on idle channels, connection analog switch I and simulation
II is switched, is realized after the signal of signal input connector input and the signal of AV modulation outputs are mixed through signal mixer 1, from letter
Number cascaded-output joint is exported simultaneously；It can just realize that AV modulation output signals are individually exported if off analog switch II；Even
Logical analog switch II, disconnects analog switch I, it is possible to achieve only exported from signal input connector input from signal cascade out splice going splice
Signal.
Further, described AV modulation modules and tuning receiving module are integrated on same PCB, and device is in a gold
Belong in radome, device has a signal input connector and a signal cascade out splice going splice and inside on metallic shield
PCB connections.Production process need to only carry out the once plug-in unit of entirety and welding, simplify production process, improve component stable
Property, it is to avoid connector is interfered and is lost.
Further, the bus arranged on pin, an electricity are shared after described AV modulation modules and tuning receiving module are integrated
Source, etc. needed for connect pin.AV modulation modules and tuning receiving module share row's pin, have saved material cost, while
The volume that AV modulation output tunings receive integrated module is reduced, installation dimension and required space is reduced, can reduce and set
Standby volume.
Further, the device wave filter I between the output of AV modulation modules and analog switch I, adding wave filter can have
Effect avoids the interference that AV modulation output signals are received to tuning.
Compared with prior art, the invention has the advantages that：
AV modulation output tuning of the present invention receives integrated module by AV modulators and high-frequency electronic tuner collection
As an entirety, while realizing the function that AV modulation output and tuning are received.Original is respectively necessary for two joints and amounts to four companies
Joint is reduced to two；Original is respectively necessary for a crystal and amounts to two being reduced to one；Original is respectively necessary for one piece of circuit board PCB and is total to
Two pieces of meter, is reduced to one piece of PCB；Original is respectively necessary for row's pin and amounts to two, is reduced to one, latter two integrated function is shared
Row pin on bus, power supply, etc. needed for connect pin；Former two modules are to realize respective loop-through output function, each module
Be required for single amplifier and power splitter, it is integrated after, it is only necessary to an amplifier and power splitter because reducing signal
Transmitting procedure link, improves signal transmission quality；Former two modules need independent production, and paster, assembling are carried out respectively, is surveyed
Examination, inspection, now only carry out once, reduce module production cost；Whole no matter independent two module designs of new design and original are also
It is original integrated design, its required component number greatly reduces, material cost obtains very big reduction.Simultaneously because device
Quantity is reduced, and its required volume is also reduced, and production complexity is also reduced, production cost reduction.In reduction material cost, production
While cost, use cost, properties of product and applicability are greatly improved；
Due to that AV modulation output channels selectively can be arranged on into idle channels, inputted from signal input connector A
Signal can be mixed with the AV channels for modulating output, and interference will not be produced each other, from signal cascade out splice going splice B outputs.
And due to first passing through amplifier from signal input connector A input signals, the reverse isolation effect of the amplifier, it is also ensured that
AV modulation output signals will not be played a reversed role into antenna or cable television system, and cable television system will not be impacted；
Intermediate frequency digital wave filter is designed as variable intermediate frequency and bandwidth, this design is adapted to more intermediate frequency demodulations will
Ask, flexible strong applicability；
After integrated, End-Customer when in use, can save a connection modulator loop-through output port to tuner
The coaxial cable of signal input port, reduces final use cost, and because reduce this root cable and corresponding two
After connector, loss of the signal in transmitting procedure is reduced, quality and receiving sensitivity is improved.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the set up box structure schematic diagram using 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 carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
A kind of AV modulation output tuning receives integrated module disclosed in the embodiment of the present invention, integrated to realize,
There is the function of AV modulators and high-frequency electronic tuner simultaneously, component number is reduced, material cost is reduced, equipment body is reduced
Product, reduces the complexity of equipment production process, improves production efficiency, and loss of the reduction signal in transmitting procedure improves quality
For the purpose of receiving sensitivity.
As depicted in figs. 1 and 2, a kind of AV modulation output tuning receives integrated module, including AV modulation modules and tuning
Receiving module, AV modulation modules and tuning receiving module are integrated on same PCB, and device is in a metallic shield, gold
Device has a signal input connector and a signal cascade out splice going splice to be connected with internal PCB on category radome, carrier wave letter
Number inputted by signal input connector, pass sequentially through and be transferred to power splitter after wave filter II and amplifier and be allocated, power splitter will
Input signal is divided into two-way, and output all the way is connected with tuning receiving module, and another road output is connected to signal mixer I, and
Analog switch II is connected between power splitter and signal mixer I and carrys out controlling switch, the output of AV modulation modules is also connected to letter
On number blender I, and analog switch I and wave filter are reconnected between the output of AV modulation modules and signal mixer I
I, signal mixer I output are connected to signal cascade out splice going splice.Carrier signal is inputted by signal input connector, by work(point
Device is divided into two-way, and tuning receiving module is transferred to all the way and passes through frequency conversion, frequency-selective filtering, other channel carrier frequencies are filtered out, will be right
Answer channel carrier signal to transform to the frequency specified, be then output to progress AV demodulation in master control and obtain vision signal and audio signal,
Vision signal and audio signal are transferred in AV modulation modules again carries out video modulation and voice modulation, and AV modulation modules are finally defeated
Go out after AV modulated signals are mixed into signal mixer I with the carrier signal of power splitter transmission to pass through defeated by signal cascade out splice going splice
Go out, whole process realizes the function that tuning is received and AV modulation is exported, component used in the mode of such a integrated design is few,
Small volume is taken, stability is good.
AV modulating parts can not only use 3/4 channel to modulate, and can also realize that all-channel is modulated, be adjusted using all-channel
When processed, two analog switches can be first disconnected, is received using tuning and full range is carried out to the signal inputted by signal input connector
Road is scanned, and finds unappropriated idle channels, then controls controller I by controlling bus, and AV modulation outputs are arranged on into sky
Ideler frequency road, connects analog switch I and analog switch II, realizes the letter of the signal inputted from signal input connector and AV modulation outputs
Number through signal mixer 1 mix after, exported simultaneously from signal cascade out splice going splice；It can just be realized if off analog switch II
AV modulation output signals are individually exported；Analog switch II is connected, analog switch I is disconnected, it is possible to achieve connect from signal cascade output
The head signal that only output is inputted from signal input connector.
AV modulation modules and tuning receiving module use same crystal, are allocated after resonance BUFFER, respectively
The local oscillator L01 of AV modulation modules and the local oscillator L02 of tuning receiving module are supplied to, the phase between two local oscillators LO1 and LO2 is reduced
Interference.
Tune receiving module and intermediate frequency filtering is carried out using digital filter, and numeral can be adjusted flexibly by controller II
Centre frequency, the bandwidth of wave filter, the need for adapting to be followed by different IF demodulation module.
AV modulation modules and tuning receiving module it is integrated after share one row pin on bus, power supply, etc. needed for connect
Pin.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be defined by claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Enter and retouch and also should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of AV modulation output tuning receives integrated module, including AV modulation modules and tuning receiving module, its feature exists
In carrier signal input AV modulation output tunings, which are received, first passes through filter and amplification all the way after integrated module, then is transferred to work(point
Device carries out signal distribution, and the output all the way of power splitter is connected to tuning receiving module, and another road output is connected to signal mixer I
Output with AV modulation modules is exported after mixing, and analog switch II, AV tune is connected between described power splitter and signal mixer I
Analog switch I is connected between the output of molding block and signal mixer I, is filled between the output of AV modulation modules and analog switch I
Wave filter I is put, when being modulated using all-channel, two analog switches is first disconnected, is received using tuning to passing through signal input connector
The signal of input carries out all-channel scanning, finds unappropriated idle channels, then controls controller I by controlling bus, will
AV modulation outputs are arranged on idle channels, connect analog switch I and analog switch II, realize the letter inputted from signal input connector
Number and AV modulate output signal through signal mixer 1 mix after, exported simultaneously from signal cascade out splice going splice.
2. AV modulation output tuning according to claim 1 receives integrated module, it is characterised in that described AV modulation
Module and tuning receiving module use same crystal, are allocated after resonance BUFFER, are respectively supplied to AV modulation moulds
Block and tuning receiving module.
3. AV modulation output tuning according to claim 1 receives integrated module, it is characterised in that described tuning connects
Receive module and intermediate frequency filtering is carried out using digital filter, and the center frequency of digital filter can be adjusted flexibly by controller II
Rate, bandwidth.
4. AV modulation output tuning according to claim 1 receives integrated module, it is characterised in that described AV modulation
Module and tuning receiving module are integrated on same PCB, and device is in a metallic shield, there is device on metallic shield
One signal input connector and a signal cascade out splice going splice are connected with internal PCB.
5. AV modulation output tuning according to claim 1 receives integrated module, it is characterised in that described AV modulation
Module and tuning receiving module it is integrated after share one row pin on bus, power supply, etc. needed for connect pin.
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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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| CN103607548B true CN103607548B (en) | 2017-08-04 |
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| CN105578158B (en) * | 2016-02-29 | 2018-06-08 | 四川九洲智能装备有限公司 | A kind of integration can cascade optical fiber reception tuner module |
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| KR100418812B1 (en) * | 2001-11-13 | 2004-02-18 | 엘지이노텍 주식회사 | Rf modulation circuit integrated with rf switch |
| WO2005064936A1 (en) * | 2003-12-26 | 2005-07-14 | Electronics And Telecommunications Research Institute | Apparatus and method for transforming a digital tv broadcasting signal to a digital radio broadcasting signal |
| US8238844B2 (en) * | 2008-06-11 | 2012-08-07 | Quintic Holdings | Radio transmitter and radio receiver with channel condition assessment |
| CN201398214Y (en) * | 2009-04-24 | 2010-02-03 | 海格欧义艾姆(天津)电子有限公司 | Two-in-one circuit of electronic tuner and radio-frequency modulator |
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| CN202309951U (en) * | 2011-11-11 | 2012-07-04 | 河南恒茂创远电子科技有限公司 | Multi-channel video multiplexer |
| CN202634622U (en) * | 2012-05-28 | 2012-12-26 | 四川九州电子科技股份有限公司 | Digital television set-top box |
| CN103078671B (en) * | 2012-12-25 | 2015-04-22 | 熊猫电子集团有限公司 | Short-wave receiving-transmitting integration system based on delay diversity |
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| CN2357444Y (en) * | 1997-03-01 | 2000-01-05 | 深圳市华为技术有限公司 | Wireless fixed table |
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