CN101895357B - Multi-frequency FM broadcasting system capable of switching in emergency alarm voice signal - Google Patents
Multi-frequency FM broadcasting system capable of switching in emergency alarm voice signal Download PDFInfo
- Publication number
- CN101895357B CN101895357B CN2010102246154A CN201010224615A CN101895357B CN 101895357 B CN101895357 B CN 101895357B CN 2010102246154 A CN2010102246154 A CN 2010102246154A CN 201010224615 A CN201010224615 A CN 201010224615A CN 101895357 B CN101895357 B CN 101895357B
- Authority
- CN
- China
- Prior art keywords
- signal
- modulation
- frequency
- unit
- mixer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 claims description 15
- 230000005236 sound signal Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 7
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
The invention relates to a multi-frequency FM broadcasting system capable of switching in emergency alarm voice signals, which comprises a first signal switching-on/off device, a second signal switching-on/off device, a signal modulation and demodulation unit, a multi-frequency FM broadcasting host centralized control circuit, a power supply unit, a loudspeaker, a key control unit and a liquid crystal display, wherein the first signal switching-on/off device, the signal modulation and demodulation unit and the second signal switching-on/off device are sequentially connected, the signal modulation and demodulation unit is connected with the multi-frequency FM broadcasting host centralized control circuit, and the power supply unit, the loudspeaker, the key control unit and the liquid crystal display are respectively connected with the multi-frequency FM broadcasting host centralized control circuit. Compared with the prior art, the method has the advantages that the full-band frequency modulation broadcast signals can cover closed sections such as tunnels, emergency alarm voice signals can be switched in during broadcasting, and the like.
Description
Technical field
The present invention relates to a kind of FM broadcasting device, but especially relate to a kind of multi-frequency frequency modulation broadcast system of switching in critical alarm speech signal.
Background technology
Technology one: critical alarm communication is introduced in the FM broadcasting of single-frequency point
River and the vcehicular tunnel more that have built up, most of tunnel are all only introduced local FM broadcasting traffic platform (for example Shanghai 105.7MHz traffic platform).As shown in Figure 1; System introduces the traffic station information through the wired broadcasting of tunnel comprehensive monitoring system; According to the traffic platform audio signal of traffic platform frequency modulation(FM) wired broadcasting, and signal is covered each zone to the tunnel through frequency modulated transmitter through antenna-feedback system and signal relay equipment.
There is defective in technology:
1) introduce the limitation of signal: owing to driver's reasons such as hobby, each is variant to travel in the tunnel the selected broadcasting channel of the vehicle radio station of vehicle.Present technique is only introduced the vehicle radio station that single FM broadcasting frequency (being generally this area traffic radio) will cause receiving other fm broadcast channels can't satisfy the demand of listening in the tunnel, can't satisfy public demand.
2) alarm function uses rate variance: when emergency occurring in the tunnel; The warning information of the changeable wired broadcasting of tunnel operation personnel and dispatch notification are to FM broadcasting; System issues in the tunnel through fm broadcast channel, and the vehicle in the tunnel can obtain the counter-measure notice of tunnel situation and situation processing through vehicle-mounted broadcasting receiver.Owing to only introduce single fm broadcast channel, when therefore causing vehicle radio station to be in other frequency accepting states, can't receive the warning information that derives from tunnel unit of operation, make the efficiency for issuing of warning information reduce greatly.
3) unicity of system's use: system must link with wired broadcasting.Do not comprise at the tunnel comprehensive monitoring system under the prerequisite of wired broadcasting, system can't operate voluntarily, accomplishes self function corresponding.
Technology two: river and vcehicular tunnel are more introduced in the multifrequency point FM broadcasting
This technology is partly being built or in the built tunnel project, is being used; As shown in Figure 2; System receives all fm broadcast signals of tunnel perimeter (88MHz～108MHz) through reception antenna; Through signal relay equipment such as radio frequency or optical fiber repeaters, the tunnel perimeter fm broadcast signal is introduced in the tunnel, satisfy the public demand that FM broadcasting is listened to.
There is defective in technology:
1) each frequency signal power is unstable: present technique covers the hypomere zone to ground, tunnel through receiving the aerial fm broadcast signal of tunnel perimeter through relevant device.The fm broadcast signal that is received is owing to the transmitting station position, and with the distance in tunnel, the difference of signal transmission environment, the signal quality that will cause equipment to receive there are differences, and mainly comprises signal power, interference signal and signal noise etc.Thereby there is notable difference in the signal quality that causes each channel of FM broadcasting in the tunnel.As shown in Figure 4:
2) poor anti jamming capability: but present technique only rejection band (88～108MHz) outer interference signals prevent that it from passing through system and introducing the tunnel.And in interference signal is in frequency range the time, interference signal can't filtering, thereby influences the power ascension of useful signal.When the interfering signal power that receives is superior to available signal, will influence signal relay equipment and amplify for the normal relaying of fm broadcast signal, will cause strong signal blocking when serious, influence the operate as normal of system.
3) alarm function is unavailable: owing to present technique is only amplified on carrier frequency for fm broadcast signal, and for its audio signal is done any processing, therefore can't realize alarm incision function.
Summary of the invention
The object of the invention is exactly to provide a kind of full frequency band fm broadcast signal that can let cover sealing sections such as tunnel in order to overcome the defective that above-mentioned prior art exists, but can be in broadcasting the multi-frequency frequency modulation broadcast system of the switching in critical alarm speech signal of switching in critical alarm speech signal.
The object of the invention can be realized through following technical scheme:
But a kind of multi-frequency frequency modulation broadcast system of switching in critical alarm speech signal; It is characterized in that; Comprise first signal divide mixer, secondary signal divide mixer, modulating and demodulating signal unit, multi-frequency frequency modulation broadcast main frame centralized control circuit, power subsystem, loudspeaker, by key control unit, LCD; Described first signal divides mixer, modulating and demodulating signal unit, secondary signal to divide mixer to connect successively; Described modulating and demodulating signal unit is connected with multi-frequency frequency modulation broadcast main frame centralized control circuit, described power subsystem, loudspeaker, is connected with multi-frequency frequency modulation broadcast main frame centralized control circuit respectively by key control unit, LCD.
Described modulating and demodulating signal unit comprises modulation-demodulation circuit and tests and use modulation-demodulation circuit; Described modulation-demodulation circuit, test divide mixer to be connected with the RF signal input end mouth of modulation-demodulation circuit with first signal, and the radiofrequency signal output port and the secondary signal of described modulation-demodulation circuit divide mixer to be connected.
Described first signal divides mixer that 16 output ports are arranged; Described secondary signal divides mixer that 15 input ports are arranged; Described modulation-demodulation circuit has 15; Described test has 1 with modulation-demodulation circuit; Described first signal divides 16 output ports of mixer to be connected with the RF signal input end mouth of modulation-demodulation circuit with RF signal input end mouth, the test of 15 modulation-demodulation circuits respectively; The radiofrequency signal output port and the secondary signal of described 15 modulation-demodulation circuits divides the mixer input port to be connected, and described multi-frequency frequency modulation broadcast main frame centralized control circuit is connected with the control and the phonetic entry port of modulation-demodulation circuit with the control of 15 modulation-demodulation circuits and phonetic entry port, 1 test respectively.
Voice and control port, alarm switching terminal voice and control port, the wired broadcasting that described multi-frequency frequency modulation broadcast main frame centralized control circuit is provided with voice switching alarm microphone joins control voice and control port, remote monitoring interface.
Described modulation-demodulation circuit comprises signal demodulation unit, audio signal control unit, signal modulating unit; Described signal demodulation unit, audio signal control unit, signal modulating unit connect successively; Described signal demodulation unit divides the output port of mixer to be connected with first signal, and described signal modulating unit divides the input port of mixer to be connected with secondary signal.
Compared with prior art, the present invention has the following advantages:
1. having solved the full frequency band fm broadcast signal technical barrier that underground enclosure space covers in tunnel or the like (comprising: the unstable and anti-tampering process etc. techniques difficult problem of power).Satisfy citizen's vehicle and in the tunnel, listened to the public demand of each channel FM broadcasting.
2. under the prerequisite that satisfies full frequency band fm broadcast signal introducing tunnel, solved the demand difficult problem of tunnel for the incision of FM broadcasting requirement critical alarm voice signal.For the O&M in tunnel and the management of taking precautions against natural calamities provide convenient.
3. device requirement diversification.Equipment is considered the site environment and the functional requirement in all kinds of tunnels, can satisfy the tunnel of different demands critical alarm incision system is introduced in to(for) the full frequency band FM broadcasting from the integrity of self according to different tunnel configuration corresponding functions.Comprise selection, critical alarm incision and the wired broadcasting interlock function of tunnel introducing tuned radio frequency and channel quantity, the terminal remote control of critical alarm incision, the ability function promptly cut in interim voice, includes system synthesis remote monitoring etc. in.
Description of drawings
Fig. 1 introduces the critical alarm communicator for the FM broadcasting of single-frequency point;
Fig. 2 introduces river and vcehicular tunnel device more for the multifrequency point FM broadcasting;
Fig. 3 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
As shown in Figure 3; But a kind of multi-frequency frequency modulation broadcast system of switching in critical alarm speech signal; Comprise that first signal divides mixer 2, secondary signal to divide mixer 3, modulating and demodulating signal unit 4, multi-frequency frequency modulation broadcast main frame centralized control circuit 5, the first signals to divide mixer 2, modulating and demodulating signal unit 4, secondary signal to divide mixer 3 to connect successively.Modulating and demodulating signal unit 4 comprises modulation-demodulation circuit 10 and tests with modulation-demodulation circuit 11.First signal divides mixer that 16 output ports are arranged, and secondary signal divides mixer that 15 input ports are arranged, and modulation-demodulation circuit has 15, and test has one with modulation-demodulation circuit.10,1 test of 15 modulation-demodulation circuits divides 16 output ports of mixer 2 to be connected with first signal respectively with the RF signal input end mouth of modulation-demodulation circuit 11, and the radiofrequency signal output port of 15 modulation-demodulation circuits 10 divides 15 input ports of mixer 3 to be connected with secondary signal respectively.10,1 test of multi-frequency frequency modulation broadcast main frame centralized control circuit 5 and 15 modulation-demodulation circuits is connected respectively with the control and the phonetic entry port of modulation-demodulation circuit 11, and the frequency that is used to control each road modulation-demodulation circuit is chosen and the modification of related data.This device also comprises power subsystem 6, loudspeaker 9, by key control unit 7, LCD 8, power subsystem 6, loudspeaker 9, be connected with multi-frequency frequency modulation broadcast main frame centralized control circuit 5 respectively by key control unit 7, LCD 8.Power subsystem 6 can provide modulating and demodulating signal unit 4, liquid crystal display 8, by the power supply of unit such as key control unit 7, loudspeaker 9; Loudspeaker 9 are used for the voice quality that test demodulates with modulation-demodulation circuit 11 is detected; Control push-button unit 7 is used for the input operation of device parameter and control command, and LCD 8 is used for display device self operating state and information data.Voice and control port, alarm switching terminal voice and control port, the wired broadcasting that multi-frequency frequency modulation broadcast main frame centralized control circuit 5 is provided with voice switching alarm microphone joins control voice and control port, remote monitoring interface.Described modulation-demodulation circuit 10 comprises signal demodulation unit, audio signal control unit, signal modulating unit; Described signal demodulation unit, audio signal control unit, signal modulating unit connect successively; Described signal demodulation unit divides the output port of mixer 2 to be connected with first signal, and described signal modulating unit divides the input port of mixer 3 to be connected with secondary signal.
But the multi-frequency frequency modulation broadcast system of switching in critical alarm speech signal is applied to the tunnel comprehensive monitoring system; Be used for the tunnel perimeter fm broadcast signal is introduced into the tunnel; And when emergency appears in the tunnel; Changeable warning information of the personnel of control centre and dispatch notification are to FM broadcasting, and system issues in the tunnel through fm broadcast channel, and the vehicle in the tunnel can obtain the counter-measure notice of tunnel situation and situation processing through vehicle-mounted broadcasting receiver.
The operation principle of this device is following: the aerial fm broadcast signal that antenna receives; Through a deciliter road device, transfer to each modulation-demodulation circuit, each modulation-demodulation circuit is through the setting of self; Select required single channel FM broadcasting frequency; Through separating after mediation modulates (every road modulation-demodulation circuit is all exported 1 tunnel and also only exported the required FM broadcasting useful signal of 1 tunnel system) once more of circuit, by a deciliter road device signal is closed the road, and export by the equipment output end mouth.For the fm broadcast signal that modulates through modulation-demodulation circuit; The signal that can modulate each road through the control circuit unit of modulation-demodulation circuit carries out independently power control; So that each road signal is when the input signal trunking; Keep each road signal power basically identical, all reach system requirements with the broadcast singal that satisfies each frequency.
Claims (2)
1. but the multi-frequency frequency modulation broadcast system of a switching in critical alarm speech signal; It is characterized in that; Comprise first signal divide mixer, secondary signal divide mixer, modulating and demodulating signal unit, multi-frequency frequency modulation broadcast main frame centralized control circuit, power subsystem, loudspeaker, by key control unit, LCD; Described first signal divides mixer, modulating and demodulating signal unit, secondary signal to divide mixer to connect successively; Described modulating and demodulating signal unit is connected with multi-frequency frequency modulation broadcast main frame centralized control circuit, described power subsystem, loudspeaker, is connected with multi-frequency frequency modulation broadcast main frame centralized control circuit respectively by key control unit, LCD;
Described modulating and demodulating signal unit comprises modulation-demodulation circuit and tests and use modulation-demodulation circuit; Described modulation-demodulation circuit, test divide mixer to be connected with the RF signal input end mouth of modulation-demodulation circuit with first signal, and the radiofrequency signal output port and the secondary signal of described modulation-demodulation circuit divide mixer to be connected;
Described first signal divides mixer that 16 output ports are arranged; Described secondary signal divides mixer that 15 input ports are arranged; Described modulation-demodulation circuit has 15; Described test has 1 with modulation-demodulation circuit; Described first signal divides 16 output ports of mixer to be connected with the RF signal input end mouth of modulation-demodulation circuit with RF signal input end mouth, the test of 15 modulation-demodulation circuits respectively; The radiofrequency signal output port and the secondary signal of described 15 modulation-demodulation circuits divides the mixer input port to be connected, and described multi-frequency frequency modulation broadcast main frame centralized control circuit is connected with the control and the phonetic entry port of modulation-demodulation circuit with the control of 15 modulation-demodulation circuits and phonetic entry port, 1 test respectively;
Voice and control port, alarm switching terminal voice and control port, the wired broadcasting that described multi-frequency frequency modulation broadcast main frame centralized control circuit is provided with voice switching alarm microphone joins control voice and control port, remote monitoring interface.
2. but the multi-frequency frequency modulation broadcast system of a kind of switching in critical alarm speech signal according to claim 1; It is characterized in that; Described modulation-demodulation circuit comprises signal demodulation unit, audio signal control unit, signal modulating unit; Described signal demodulation unit, audio signal control unit, signal modulating unit connect successively; Described signal demodulation unit divides the output port of mixer to be connected with first signal, and described signal modulating unit divides the input port of mixer to be connected with secondary signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102246154A CN101895357B (en) | 2010-07-12 | 2010-07-12 | Multi-frequency FM broadcasting system capable of switching in emergency alarm voice signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102246154A CN101895357B (en) | 2010-07-12 | 2010-07-12 | Multi-frequency FM broadcasting system capable of switching in emergency alarm voice signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101895357A CN101895357A (en) | 2010-11-24 |
| CN101895357B true CN101895357B (en) | 2012-05-30 |
Family
ID=43104441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102246154A Active CN101895357B (en) | 2010-07-12 | 2010-07-12 | Multi-frequency FM broadcasting system capable of switching in emergency alarm voice signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101895357B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023573B (en) * | 2012-12-31 | 2015-06-03 | 厦门胜华通信技术有限公司 | Digital optical fiber repeater system for frequency modulation broadcast |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2456379Y (en) * | 2000-12-07 | 2001-10-24 | 四川省广播电视科研所 | Optical transceiver and transmitter |
| JP4100199B2 (en) * | 2003-03-11 | 2008-06-11 | 住友電気工業株式会社 | Digital broadcast wave relay method, transmitter and receiver |
| US7398023B2 (en) * | 2004-12-15 | 2008-07-08 | Tyco Telecommunications (Us) Inc. | Method and apparatus for bias and alignment control in an optical signal transmitter |
| CN201018511Y (en) * | 2006-11-16 | 2008-02-06 | 上海鑫众通信技术有限公司 | Optical Fiber Repeater |
| CN201315578Y (en) * | 2008-12-10 | 2009-09-23 | 桂林南方通信设备工程公司 | Digital audio microwave transmission system |
-
2010
- 2010-07-12 CN CN2010102246154A patent/CN101895357B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101895357A (en) | 2010-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101178879B1 (en) | Emergency broadcasting system of inside tunnel | |
| KR102040523B1 (en) | Force transmission system for individual disaster broadcasting | |
| AU686889B2 (en) | Radio telephone base station with a monitoring apparatus | |
| US3760278A (en) | Limited range radiocommunication system | |
| CN103023573B (en) | Digital optical fiber repeater system for frequency modulation broadcast | |
| CN101895357B (en) | Multi-frequency FM broadcasting system capable of switching in emergency alarm voice signal | |
| CN201781496U (en) | Multiple-frequency modulation broadcaster | |
| KR100285086B1 (en) | Underground Wireless Network Relay System | |
| KR100740588B1 (en) | Underground wireless network general repeater | |
| KR970000161B1 (en) | Underground integrated wireless repeater | |
| Glazkov et al. | GNU Radio Based RDS Transceiver for Data Communication | |
| KR20100035282A (en) | The subway wireless transmitting system using leaky coaxial cable | |
| KR200279891Y1 (en) | Accident preventing System of inner tunnel using radically leakage coaxial cable | |
| CA1316985C (en) | Simulcast broadcasting system and method | |
| KR200318288Y1 (en) | Combiner And Wireless Communication System Using It In An Underground Space | |
| KR20000045268A (en) | Apparatus for monitoring state of radio repeater | |
| US2866088A (en) | Radio communication within shielded enclosures | |
| JP5335193B2 (en) | Mobile phone network for communication between two communication facilities | |
| JPH0816970A (en) | Small wireless relay device | |
| KR200340071Y1 (en) | Fm broadcast repeater for use in underground | |
| KR100520200B1 (en) | Emergency Broadcasting System in The Closed Area | |
| KR100587503B1 (en) | Relay device of wireless communication system having different frequency band | |
| JPH0522207A (en) | Protection radio system | |
| KR200363176Y1 (en) | Underground radio network integrated repeater system | |
| CN203027262U (en) | Frequency-modulation broadcasting digital optical fibre repeater system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 200071 Shanghai Zhabei District Tibet North Road, building 10, floor 1-3, No. 489 Patentee after: CRSC COMMUNICATION & INFORMATION GROUP SHANGHAI CO., LTD. Address before: 200436 No. 199 West Road, Zhabei District, Shanghai Patentee before: Shanghai Xingantong Communication Equipment Co., Ltd. |