CN209184609U - Intermediate waves broadcast message remotely receives system - Google Patents
Intermediate waves broadcast message remotely receives system Download PDFInfo
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- CN209184609U CN209184609U CN201822208912.4U CN201822208912U CN209184609U CN 209184609 U CN209184609 U CN 209184609U CN 201822208912 U CN201822208912 U CN 201822208912U CN 209184609 U CN209184609 U CN 209184609U
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- intermediate waves
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- receiving module
- client computer
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Abstract
The utility model relates to a kind of intermediate waves broadcast messages remotely to receive system, include intermediate waves receiving module, server, interchanger, client computer, intermediate waves receiving module and server pass through USB communication connection and distally mounted, client computer is mounted on local side, client computer realizes that lan network is remotely connect by interchanger with server, make intermediate waves receiving module and client computer can be respectively in two places, equipment arrangement is more flexible；Intermediate waves receiving module includes sequentially connected receiving antenna, tuning circuit, radio frequency filter circuit and main circuit, tuning circuit includes sequentially connected π type LC tuning network and low-pass filter circuit, wherein tuning network adjusts the value of variable inductance and variable capacitance according to the frequency of intermediate waves, so that system has preferable impedance matching under the frequency with receiving antenna, therefore system can have preferable reception, the garbage signal that low-pass filter circuit will be above 74.8MHz is filtered out, and the interference of reception system is reduced.
Description
Technical field
The utility model relates to a kind of intermediate waves broadcast messages remotely to receive system.
Background technique
Current broadcast system receives the intermediate waves of distal end by receiving antenna, and main circuit is sent directly into after simply filtering
In handled, audio that treated is admitted in client computer again to broadcast, and in the prior art, receiving antenna is short in
Wave cannot reach good impedance matching, and the reception of system alignment shortwave is bad.
Utility model content
The purpose of this utility model is that aiming at the shortcomings in the prior art, and it is long-range to provide a kind of intermediate waves broadcast message
The reception of reception system, the reception system alignment shortwave is preferable.
The purpose of this utility model is achieved through the following technical solutions: intermediate waves broadcast message remotely receives system, includes
Intermediate waves receiving module, server, interchanger, client computer, intermediate waves receiving module and server pass through USB communication connection
And it is distally mounted, the client computer is mounted on local side, client computer and server and realizes LAN net by interchanger
Network remotely connects, and the intermediate waves receiving module includes receiving antenna, main circuit, radio frequency filter circuit and tuning circuit, receives
Antenna, tuning circuit, radio frequency filter circuit and main circuit are sequentially connected, and the tuning circuit includes sequentially connected π type LC tune
Humorous network and low-pass filter circuit, the capacitor in the π type LC tuning network are variable capacitance, in the π type LC tuning network
Inductance be variable inductance, be serially connected with standing-wave ratio detection circuit, standing wave between the π type LC tuning network and low-pass filter circuit
It is electrically connected than detection circuit with the main circuit.
Wherein, radio frequency filter circuit includes sequentially connected automatic attenuation circuit, filter group and low noise circuit.
Wherein, the filter bank has the high-pass filter to connect, low-pass filter and multiple and different filtering frequency ranges
Bandpass filter parallel with one another.
Wherein, the frequency range of the filter group covers 0.03MHz~74.8MHz.
Wherein, the main circuit includes sequentially connected automatic attenuation circuit, A/D circuit, processor, DSP, D/A circuit
And loudspeaker.
Wherein, the processor is specifically FPGA.
The utility model has the advantages that
The utility model includes intermediate waves receiving module, server, interchanger, client computer, intermediate waves receiving module
With server by USB communication connection and distally mounted, client computer is mounted on local side, client computer and server
It realizes that lan network remotely connects by interchanger, makes intermediate waves receiving module and client computer can be respectively in two places, equipment arrangement
More flexibly；Intermediate waves receiving module includes sequentially connected receiving antenna, tuning circuit, radio frequency filter circuit and main circuit,
Tuning circuit includes sequentially connected π type LC tuning network and low-pass filter circuit, and wherein LC tuning network is according to intermediate waves
Frequency adjusts the value of variable inductance and variable capacitance, so that system has preferable impedance under the frequency with receiving antenna
Match, therefore system can have preferable reception, the garbage signal that low-pass filter circuit will be above 74.8MHz is filtered out, and is reduced
The interference of reception system.Standing-wave ratio detection circuit provides the information such as match condition, the received signal strength of reception system and antenna
To staff, making staff, information is adjusted LC tuning network accordingly, while receiving intensity is sent to main circuit
Do reception assessment.
Detailed description of the invention
Using attached drawing, the utility model is described in further detail, but the embodiment in attached drawing is not constituted to the utility model
Any restrictions for those of ordinary skill in the art without creative efforts, can also be according to following attached
Figure obtains other attached drawings.
Fig. 1 is the system block diagram that intermediate waves broadcast message remotely receives system.
Fig. 2 is the circuit diagram of tuning circuit.
Fig. 3 is the circuit diagram of radio frequency filter circuit.
Fig. 4 is the circuit diagram of main circuit.
Specific embodiment
The utility model is further described with the following Examples.
See Fig. 1, it includes intermediate waves receiving module, server and wherein server that intermediate waves broadcast message, which remotely receives system,
Software, interchanger, client computer and wherein client software.Wherein, intermediate waves receiving module and server are communicated by USB
Distally mounted after connection, client computer is mounted on local side, so that distal end is realized that lan network is remote with local side by interchanger
Journey connection.Intermediate waves receiving module receives extraneous intermediate waves when use, is transmitted to client by communication line after processing
It broadcasts on computer, realizes the long-range reception of intermediate waves, in the process, intermediate waves receiving module and client computer can be respectively two
Ground, equipment arrangement are more flexible.
Intermediate waves receiving module includes receiving antenna, main circuit, radio frequency filter circuit and tuning circuit, receiving antenna, tune
Humorous circuit, radio frequency filter circuit and main circuit are sequentially connected.
See that Fig. 2, tuning circuit include sequentially connected π type LC tuning network, standing-wave ratio detection circuit, low-pass filtering electricity
Road, wherein π type LC tuning network adjusts the value of variable inductance and variable capacitance according to the reception frequency of system, so that receiving system
System has preferable impedance matching under the frequency with receiving antenna, so that the system of reception has preferable reception；Standing-wave ratio inspection
Slowdown monitoring circuit provides the information such as match condition, the received signal strength of reception system and antenna to staff, make staff according to
This information is adjusted tuning network, while receiving intensity is sent to main circuit and does reception assessment.Low-pass filter
The garbage signal that mainly will be above 74.8MHz is filtered out, and the interference of reception system is reduced.Filtered RF signal is conveyed to
Radio frequency filter circuit is handled.
See that Fig. 3, radio frequency filter circuit include sequentially connected automatic attenuation circuit (ATT), filter group and low noise electric discharge
Road, wherein filter group is by high-pass filter, low-pass filter, multiple and different bandpass filters parallel with one another for filtering frequency range
Composition, the frequency range of filter group cover 0.03MHz~74.8MHz, can by band logical, high pass and low-pass filter will in
The RF such as wave signal, short-wave signal signal has carried out region filtering, has filtered out useless noise signal and has been then fed into main circuit.
See that Fig. 4, main circuit include sequentially connected automatic attenuation circuit (another ATT), A/D circuit, FPGA, DSP, D/A
And loudspeaker, it is converted into digital radio signal after being sent into the RF signal progress A/D acquisition of main circuit, is then passed through inside FPGA
Algorithm, which is realized, demodulates digital medium-frequency signal with local oscillation signal down coversion, is then filtered to digital medium-frequency signal by program
Wave, phase shift, Frequency mixing processing, make digital medium-frequency signal be reduced into digital audio and video signals, and digital audio and video signals are carried out by USB all the way
It exports to client computer, another way, which is sent to inside DSP, carries out the processing such as AGC gain detection control, filtering, amplification, detection, so
It after becoming analog audio signal by D/A circuit conversion afterwards, is sent to loudspeaker and is broadcasted, staff can receive in intermediate waves
It is located in carry out audition where module.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (5)
1. intermediate waves broadcast message remotely receives system, it is characterized in that: including intermediate waves receiving module, server, interchanger, visitor
Family end computer, intermediate waves receiving module and server pass through USB communication connection and distally mounted, the client computer installation
In local side, client computer realizes that lan network is remotely connect by interchanger with server, the intermediate waves receiving module packet
Containing receiving antenna, main circuit, radio frequency filter circuit and tuning circuit, receiving antenna, tuning circuit, radio frequency filter circuit and main electricity
Road is sequentially connected, and the tuning circuit includes sequentially connected π type LC tuning network and low-pass filter circuit, the π type LC tune
Capacitor in humorous network is variable capacitance, and the inductance in the π type LC tuning network is variable inductance, and the π type LC tunes net
Standing-wave ratio detection circuit is serially connected between network and low-pass filter circuit, standing-wave ratio detection circuit is electrically connected with the main circuit.
2. intermediate waves broadcast message according to claim 1 remotely receives system, it is characterized in that: radio frequency filter circuit includes
Sequentially connected automatic attenuation circuit, filter group and low noise circuit.
3. intermediate waves broadcast message according to claim 2 remotely receives system, it is characterized in that: the filter bank has
The bandpass filter parallel with one another of the high-pass filter, low-pass filter and multiple and different filtering frequency ranges that connect.
4. intermediate waves broadcast message according to claim 1 remotely receives system, it is characterized in that: the main circuit include according to
Automatic attenuation circuit, A/D circuit, processor, DSP, D/A circuit and the loudspeaker of secondary connection.
5. intermediate waves broadcast message according to claim 4 remotely receives system, it is characterized in that: the processor is specifically
FPGA。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822208912.4U CN209184609U (en) | 2018-12-26 | 2018-12-26 | Intermediate waves broadcast message remotely receives system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822208912.4U CN209184609U (en) | 2018-12-26 | 2018-12-26 | Intermediate waves broadcast message remotely receives system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209184609U true CN209184609U (en) | 2019-07-30 |
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ID=67377891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822208912.4U Active CN209184609U (en) | 2018-12-26 | 2018-12-26 | Intermediate waves broadcast message remotely receives system |
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| Country | Link |
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| CN (1) | CN209184609U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532772A (en) * | 2020-11-23 | 2021-03-19 | 惠州Tcl移动通信有限公司 | Antenna tuning circuit, implementation method and mobile terminal |
-
2018
- 2018-12-26 CN CN201822208912.4U patent/CN209184609U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532772A (en) * | 2020-11-23 | 2021-03-19 | 惠州Tcl移动通信有限公司 | Antenna tuning circuit, implementation method and mobile terminal |
| CN112532772B (en) * | 2020-11-23 | 2023-09-19 | 惠州Tcl移动通信有限公司 | Antenna tuning circuit, implementation method and mobile terminal |
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