CN201369737Y - Wired frequency-modulation broadcasting transmit-receive system - Google Patents
Wired frequency-modulation broadcasting transmit-receive system Download PDFInfo
- Publication number
- CN201369737Y CN201369737Y CNU2009201252894U CN200920125289U CN201369737Y CN 201369737 Y CN201369737 Y CN 201369737Y CN U2009201252894 U CNU2009201252894 U CN U2009201252894U CN 200920125289 U CN200920125289 U CN 200920125289U CN 201369737 Y CN201369737 Y CN 201369737Y
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- broadcasting
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Abstract
The utility model discloses a wired frequency-modulation broadcasting transmit-receive system, comprising a wired frequency-modulation broadcasting transmission system and a wired frequency-modulation broadcasting receiving system, wherein the wired frequency-modulation broadcasting transmission system is connected by the output end of an exciter of a transmission station and a mixer, the output end of a 74Hz signal generator and the output end of the mixer are connected with a lower frequency-conversion filtering circuit, and the output end of the lower frequency-conversion filtering circuit is connected with a wired machine room mixer; the wired frequency-modulation broadcasting receiving system is composed of the output end of a bandpass filter and an upper transducer, the output end of the upper transducer is connected with a 87-108MHZ filter, the output end of the 87-108MHZ filter is connected with an amplitude limiting AGC amplifying circuit, the output end of the amplitude limiting AGC amplifying circuit is connected with a 87-108MHZ bandwidth amplifying circuit which is connected with a bandwidth transmitting antenna. The wired frequency-modulation broadcasting transmit-receive system is convenient for listening of a user, the cost is low, and the batch production of the equipment is easy to realize.
Description
Technical field
The utility model relates to the FM broadcasting technical field, particularly the system of FM broadcasting reception and transmission.
Background technology
The broadcasting development is from wired broadcasting to the FM broadcasting, and along with development of technology, FM broadcasting is divided into monophony and stereophonic broadcasting again, digital stereo broadcasting, the synchronous frequency-modulating broadcast of highway etc.But,, be difficult to realize that with the high-power frequency radio station large tracts of land covers because of with a varied topography in some areas.Although some places have transmitted fm broadcast signal in cable television network, also mainly there is following problem, and can not really realizes " the village village is logical " of countryside broadcast.
1, the radio station that makes with a varied topography exists multipath to disturb, and received signal is poor.
2, the frequency of radio station utilance is low.
3, there is the blind area in the radio signals covering and the blind area can't be listened to.
4, the frequency of radio station of different regions planning, can cause to move needs constantly to change receive frequency when listening to.
5, the FM signal that transmits in the cable television network can't receive with common broadcast receiver, also because of continuing amplifying emission with frequency.
Summary of the invention
The purpose of this utility model be to overcome above-mentioned shortcoming and a kind of user of being convenient to of providing listen to, with low cost, realize wired FM broadcasting sending/receiving system of the batch process of equipment easily.
Wired FM broadcasting sending/receiving system of the present utility model, comprise wired FM broadcasting transmitting system and wired FM broadcasting receiving system, wherein: wired FM broadcasting transmitting system, be connected with blender by 94MHz transmitting station exciter output, 99.3MHz transmitting station exciter output, 103.6Mhz transmitting station exciter output and 102.4MHz transmitting station exciter output, the output of 74MHz signal generator and the output of blender are connected with the down-conversion filter circuit, and down-conversion filter circuit output and wired machine room blender connect and compose;
Wired FM broadcasting receiving system is made up of band pass filter, upconverter, 87-108MHz filter, amplitude limit AGC amplifying circuit, 87-108MHz broadband power amplifier, the output of band pass filter is connected with upconverter, the output of upconverter is connected with the 87-108MHz filter, the output of 87-108MHz filter is connected with amplitude limit AGC amplifying circuit, the output of amplitude limit AGC amplifying circuit is connected with 87-108MHz bandwidth power amplifier, and 87-108MHz bandwidth power amplifier is connected with the broadband emission antenna.
Above-mentioned wired FM broadcasting sending/receiving system, wherein: wired FM broadcasting transmitting system is connected with blender with several low frequency modulations devices (producing the 13MHz-34MHz FM signal) output, the blender output is connected with the 74MHz annunciator, and 74MHz annunciator output is connected with wired machine room blender.
The utility model is compared with prior art, as can be known from the above technical solutions, listen to less than in
The utility model is compared with prior art, as can be known from the above technical solutions, in the natural stockaded village of listening to less than central transmitting station, launches by the low frequency fm signal frequency is reduced into standard frequency again, can realize FM broadcasting.Receive frequency is constant simultaneously, and memory is convenient to the user and is listened to easily.In decentre machine room place far away, because adjacent two little launch points are equal substantially to the cable length of central machine room arbitrarily, the basic homophase of the signal of its emission is promptly similar in appearance to synchronized broadcasting.According to the geographical position, but several watts to several watts of transmitting power zero points be easy to realize that the Class A of broadband power amplifier amplifies and modularization, with low cost.Simultaneously, so little transmitting power also can be used the interior feedback 60V power supply of cable television network, makes cost lower.And the frequency transform techniques maturation, realize the batch process of equipment easily.
Below, further specify the beneficial effects of the utility model by embodiment.
Description of drawings
Accompanying drawing is wired FM broadcasting sending/receiving system principle schematic of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, wired its embodiment of FM broadcasting sending/receiving system, structure, feature and effect thereof to foundation the utility model proposes are described in detail as follows:
Wired FM broadcasting sending/receiving system of the present utility model, comprise wired FM broadcasting transmitting system and wired FM broadcasting receiving system, wherein: wired FM broadcasting transmitting system, be connected with blender by 94MHz transmitting station exciter output, 99.3MHz transmitting station exciter output, 103.6Mhz transmitting station exciter output and 102.4MHz transmitting station exciter output, the output of 74MHz signal generator and the output of blender are connected with the down-conversion filter circuit, and down-conversion filter circuit output and wired machine room blender connect and compose;
Wired FM broadcasting receiving system is made up of band pass filter, upconverter, 87-108MHz filter, amplitude limit AGC amplifying circuit, 87-108MHz broadband power amplifier, the output of band pass filter is connected with upconverter, the output of upconverter is connected with the 87-108MHz filter, the output of 87-108MHz filter is connected with amplitude limit AGC amplifying circuit, the output of amplitude limit AGC amplifying circuit is connected with 87-108MHz bandwidth power amplifier, and 87-108MHz bandwidth power amplifier is connected with the broadband emission antenna.
Above-mentioned wired FM broadcasting transtation mission circuit, wherein: as to the whole network with no requirement (NR) frequently, transmitting terminal can mix with the 74MHz signal directly with several low frequency modulations devices generation 13MHz-34MHz FM signal, can remove the down-conversion filter circuit from this case.
Its operation principle is as follows:
In wired FM broadcasting transmitting system, 94MHz transmitting station exciter, 99.3MHz transmitting station exciter, 103.6MHz transmitting station exciter, 102.4Mhz the transmitting station exciter produces 94MHz respectively, 99.3MHz, 102.4MHz, 103.6MHz tuned radio frequency, more than four frequencies after blender mixes, output to the down-conversion filter circuit, and the 74MHz constant-amplitude signal of exporting with the 74MHz signal generator in the down-conversion filter circuit carries out the difference frequency modulation, generate 20MHz, 25.3MHz, 28.4MHz, 29.6MHz four low frequency FM signal, wired machine room blender with these four low frequency FM signal with send to cable television network after the 74MHz signal mixes.
In wired FM broadcasting receiving system, the cable TV signal that receives from cable television network passes through band pass filter, from cable TV signal, isolate the low frequency FM signal of 74MHz signal and 13-34MHz, the low frequency FM signal of 74MHz signal and 13-34MHz is regenerated the FM signal of 87-108MHz FM broadcasting frequency range in upconverter, passing through the 87-108MHz filter, amplitude limit AGC amplifying circuit is launched with the broadband emission antenna after 87-108MHz broadband power amplifier small-power is amplified again;
As really to accomplish in will be on a large scale and central transmitting station with frequently, wired machine room FM signal should be taken from the exciter of transmitting station, produces the 13MHz-34MHz fm broadcast signal with exciter signal and 74MHz signal difference frequency.
The above, it only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, any technical solutions of the utility model content that do not break away from,, all still belong in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present utility model.
Claims (2)
1, a kind of wired FM broadcasting sending/receiving system, comprise wired FM broadcasting transmitting system and wired FM broadcasting receiving system, wherein: wired FM broadcasting transmitting system, be connected with blender by 94MHz transmitting station exciter output, 99.3MHz transmitting station exciter output, 103.6Mhz transmitting station exciter output and 102.4MHz transmitting station exciter output, the output of 74MHz signal generator and the output of blender are connected with the down-conversion filter circuit, and down-conversion filter circuit output and wired machine room blender connect and compose;
Wired FM broadcasting receiving system is made up of band pass filter, upconverter, 87-108MHz filter, amplitude limit AGC amplifying circuit, 87-108MHz broadband power amplifier, the output of band pass filter is connected with upconverter, the output of upconverter is connected with the 87-108MHz filter, the output of 87-108MHz filter is connected with amplitude limit AGC amplifying circuit, the output of amplitude limit AGC amplifying circuit is connected with 87-108MHz bandwidth power amplifier, and 87-108MHz bandwidth power amplifier is connected with the broadband emission antenna.
2, wired according to claim 1 FM broadcasting sending/receiving system, it is characterized in that: wired FM broadcasting transmitting system is connected with blender with several low frequency modulations device outputs, the blender output is connected with the 74MHz annunciator, and 74MHz annunciator output is connected with wired machine room blender.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201252894U CN201369737Y (en) | 2009-03-13 | 2009-03-13 | Wired frequency-modulation broadcasting transmit-receive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201252894U CN201369737Y (en) | 2009-03-13 | 2009-03-13 | Wired frequency-modulation broadcasting transmit-receive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201369737Y true CN201369737Y (en) | 2009-12-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2009201252894U Expired - Fee Related CN201369737Y (en) | 2009-03-13 | 2009-03-13 | Wired frequency-modulation broadcasting transmit-receive system |
Country Status (1)
| Country | Link |
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| CN (1) | CN201369737Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571836A (en) * | 2016-10-26 | 2017-04-19 | 武汉大学 | Frequency-modulated radio transmitting system and frequency-modulated radio transmitting method |
| CN114978203A (en) * | 2022-04-25 | 2022-08-30 | 南宁广播电视台 | Multi-frequency modulation transmitter |
-
2009
- 2009-03-13 CN CNU2009201252894U patent/CN201369737Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571836A (en) * | 2016-10-26 | 2017-04-19 | 武汉大学 | Frequency-modulated radio transmitting system and frequency-modulated radio transmitting method |
| CN114978203A (en) * | 2022-04-25 | 2022-08-30 | 南宁广播电视台 | Multi-frequency modulation transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091223 Termination date: 20110313 |