CN202663542U - Automatic wired broadcast switching system - Google Patents
Automatic wired broadcast switching system Download PDFInfo
- Publication number
- CN202663542U CN202663542U CN 201220321159 CN201220321159U CN202663542U CN 202663542 U CN202663542 U CN 202663542U CN 201220321159 CN201220321159 CN 201220321159 CN 201220321159 U CN201220321159 U CN 201220321159U CN 202663542 U CN202663542 U CN 202663542U
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- Prior art keywords
- power amplifier
- multimedia
- control room
- wired broadcast
- master control
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 4
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model discloses an automatic wired broadcast switching system. The automatic wired broadcast switching system comprises a constant-voltage power amplifier of a master control room as well as multimedia power amplifiers and supporting multimedia sound boxes of multiple classrooms, wherein wired broadcast signals output by the constant-voltage power amplifier are accessed to the multimedia power amplifiers through audio power output lines. According to the automatic wired broadcast switching system, the wired broadcast signals of the master control room are directly accessed to all multimedia power amplifier input interfaces of the classrooms, subjected to current limiting by resistors with larger resistance values, subjected to pre-amplification by the multimedia power amplifiers, and finally output to horns or loudspeakers, so that when the master control room has an emergency public address, all the classrooms can be automatically switched to the public address of the master control room and are automatically restored to classroom public addresses after the public address of the master control room stops for five seconds. The condition that the emergency public address and the classroom public addresses are mixed in a system is realized, a set of equipment has multiple purposes, the repeated investment is reduced, and the interior of the classrooms is neater.
Description
Technical field
Utility model relates to the broadcast technology field, specifically relates to a kind of wired broadcasting automatic switchover system.
Background technology
Hang many covers sound amplifier on present universities, middle and primary schools' classroom interior walls, had plenty of teacher's public address of giving a lesson, had plenty of the English Listening Comprehension public address, had plenty of the public broadcasting public address.Because technology is immature, every cover sound amplifier all is independent use, and is very large to school's investment cost, and management, maintenance cost are very high, and the classroom interior walls is not attractive in appearance.
Such as Fig. 1, the public system main frame is in order to realize longer-distance signal transmission, the voltage general provision that outputs on the program circuit is 20～120V (the level pressure standard that various countries formulate is different), under this pattern, Public Address system is basically by main frame, and program circuit and an above terminal audio amplifier unit form.Wherein main frame is comprised of source of sound and integrated high-power constant-voltage power amplifier (transistor power amplifier that extensively adopts at present), and there is the defect that can't fundamentally overcome of four aspects in this broadcast host: the one, and acoustics is difficult to accomplish high-fidelity; The 2nd, reliability and stability are poor, because being each loudspeaker, the constant-pressure type output mode is connected to power amplifier output by line transformer, the characteristics of line transformer are that its first stage load significantly increases the weight of when low frequency, when number of connection is more, can make power amplifier send out the amount of holding height, than being easier to damage and aging etc.; The 3rd, constant-pressure type output is subjected to line resistance, distributed capacitance, the restriction of the power loss of distributed inductance, power loss on the circuit is not only that effective power is reduced, main is that this loss is directly related with frequency, makes frequency response become bad, and the longer loss of distance and the bad situation of change are more serious.
The utility model content
In view of above-mentioned, above-mentioned drawback that this machine has adopted new technology design customer service, and provide a kind of wired broadcasting automatic switchover system, specifically adopt: a kind of wired broadcasting automatic switchover system, be comprised of the multimedia power amplifier in the level pressure power amplifier of master-control room, a plurality of classrooms and supporting multimedia loudspeaker box, the cable broadcasting signal of described level pressure power amplifier output is by audio power outlet line access multimedia power amplifier.
Further, described cable broadcasting signal outputs to loudspeaker after the preposition amplification of multimedia power amplifier.
Described cable broadcasting signal is delivered to conducting terminal through connecting flower seat plug company spends on the seat, ac voltage signal on company's flower seat is through first resistance current limliting, to the 5th shunt resistance ground connection, again through diode, the ac voltage rectifier with wired broadcast singal is become direct voltage.
Compared with prior art, the utility model is owing to directly be linked into the cable broadcasting signal of master-control room the input interface of each multimedia power amplifier in classroom, through the resistance current limliting of larger resistance value, after the preposition amplification of multimedia power amplifier, finally output to loudspeaker or loud speaker again.The level pressure power amplifier of output cable broadcasting signal does not have caloric value, therefore is not easy to damage and wear out.Because the input of the equipment of joining does not have inductive load, Gu there is not the low frequency problem that overloads, when master-control room had urgent public address, the public address that master-control room can be automaticallyed switch in each classroom after the master-control room public address stopped for 5 seconds, recovered the classroom public address automatically.Realized urgent public address and classroom public address are mixed in the cover system, cleaner and tidier in a set of equipment multiple use, minimizing overlapping investment, the classroom.
Description of drawings
Fig. 1 is the structure chart of prior art broadcast system.
Fig. 2 is the structure chart of the utility model broadcast system.
Fig. 3 is the circuit diagram of the utility model broadcast system.
Below in conjunction with the drawings and specific embodiments the utility model is described in detail.
Embodiment
As shown in Figure 3, connect flower seat 001 and comprise insulating body and two conducting terminals in insulating body (among the figure 101), broadcasting input signal terminal and earth terminal.
Resistance R 1 contact resistance R5 is shunting ground connection, and diode D1 is plastic packaging rectifier diode, and the terminal of contact resistance R1 becomes direct voltage to the ac voltage rectifier of cable broadcasting signal through diode D1 anode.
Triode BG1 is the NPN junction type, and its B utmost point is connected with diode D1 negative terminal, and resistance R 7 provides bias voltage for the C utmost point of triode BG1.
Triode BG2 is the NPN junction type, and its B utmost point is connected with the C utmost point of triode BG1.Triode BG3 and triode BG4 are the NPN junction type, and triode BG3 is connected base stage and is connected with resistance R 2 one ends with BG4, and resistance R 3 is connected terminal and is connected with the preposition of power amplifier with R4, and resistance R 3 is connected with the R4 another terminal and is connected the C utmost point with BG4 with triode BG3 and is connected.
Resistance R 9 one ends are connected with an end of resistance R 3 with the C utmost point of triode BG4 and are connected, resistance R 9 other ends and 8 anodal connections of capacitor C, and electrolysis C8 negative terminal is connected with audio-frequency power amplifier R sound channel input.
Resistance R 10 1 terminals are connected with an end of resistance R 4 with the C utmost point of triode BG4 and are connected, and resistance R 10 another terminals are connected with the positive terminal of capacitor C 7, and the negative terminal terminal of capacitor C 7 is connected with audio-frequency power amplifier L sound channel input.
Resistance R 16 1 terminals are connected with even spending seat 001 signal input part, the another terminal of resistance R 16 is connected with the positive terminal of capacitor C 5, capacitor C 5 negative terminals are connected with a terminal of resistance R 14, and another terminal of resistance R 14 is connected with capacitor C 7 anodes of L sound channel.
One terminal of resistance R 15 is connected with the positive terminal of capacitor C 5, and the another terminal of resistance R 15 is connected with capacitor C 8 positive terminals of R sound channel.
Cable broadcasting signal (level pressure power amplifier output 20～120V alternating voltage) is spent on the seat 001 to the company of conducting terminal through connecting flower seat plug (the sound size is constant by the level pressure power amplifier), ac voltage signal on company's flower seat 001 is through resistance R 1 current limliting, to resistance R 5 shunting ground connection, again through diode D1, ac voltage rectifier with wired broadcast singal is become direct voltage, the voltage that gets from diode D1 rectification, through to triode BG1 base stage (among the figure 102), triode BG1 conducting, the conducting of triode BG1, be equivalent to the E utmost point and the conducting of the C utmost point of triode BG1, the C utmost point ground connection of triode BG1, so lead to the triode BG2 triode B utmost point no-voltage of (among the figure 103), resistance R 2 power supplies (among the figure 104) are given in triode BG2 triode cut-off, resistance R 8, through the resistance R 2 triode BG3 that flows through, the B utmost point of triode BG4, triode BG3 and BG4 conducting.
The input terminal 106 of power amplifier R sound channel and L sound channel, this terminal is by comprising that insulating body and two conducting terminals in insulating body and the terminal that shares form.
The R sound channel that the music of being come by input terminal 106 or other come such as: DVD source of sound and L sound channel signal are through volume controller 107, again through sound source amplifier 108, through the R of tonequality adjuster 109 sound channel and L sound channel, through mixer amplifier 205 signal of R sound channel and L sound channel is amplified again again.
Signal is by microphone signal input terminal 201, entering microphone amplifier 202 amplifies, again by the adjustment of microphone volume controller 203 and tonequality adjuster 204, microphone signal after the adjustment of volume tonequality enters mixer amplifier 205, respectively R sound channel L sound channel is mixed and amplify, draw with the R sound channel of microphone signal with the L sound channel of microphone signal.
With R sound channel signal process resistance R 3, the R9 of microphone signal and music, capacitor C 8 enters multimedia power amplifier 207 and amplifies; And pass through R4 with the L sound channel signal of microphone signal and music, and resistance R 10, capacitor C 7 enter multimedia power amplifier 207 amplifies, and the signal after multimedia power amplifier 207 amplifies outputs to loud speaker or loudspeaker.
The operation principle of the utility model broadcast system is as follows: when master-control room is gone on the air, broadcasting wired output signal output 20～120V exchanges, become direct voltage by resistance R 1 and R16 current limliting and by diode D1 rectification, triode BG1 conducting when triode BG1 base stage has voltage, triode BG2 cut-off, because the cut-off of triode BG2, give triode BG3 by resistance R 8 and resistance R 2, the base stage of triode BG4 provides a malleation, triode BG3 and BG4 conducting, because the preposition output of multimedia power amplifier is through the C utmost point of triode BG3 and BG4, signal ground, the music of this machine and microphone are also just noiseless, another road of cable broadcasting signal is through resistance R 16 current limlitings, is divided into left and right acoustic channels by resistance R 14 and R15 (among the figure 105), and this two paths of signals is walked around the C utmost point of triode BG3 and BG4, entered power amplifier and amplified, heard thus broadcast sounds.
When off-the-air, triode BG1 base stage is 0, triode BG1 cut-off, and resistance R 7 gives capacitor C 2 chargings, be full of electricity after several seconds, triode BG2 conducting, triode BG3 and BG4 cut-off, music and the microphone signal of the machine pass through smoothly, enter rear class and amplify, and teaching, it is normal to reply.
Claims (3)
1. wired broadcasting automatic switchover system, be comprised of the multimedia power amplifier in the level pressure power amplifier of master-control room, a plurality of classrooms and supporting multimedia loudspeaker box, it is characterized in that: the cable broadcasting signal of described level pressure power amplifier output is by audio power outlet line access multimedia power amplifier.
2. wired broadcasting automatic switchover system according to claim 1 is characterized in that, described cable broadcasting signal outputs to loudspeaker after the preposition amplification of multimedia power amplifier.
3. wired broadcasting automatic switchover system according to claim 1, it is characterized in that, described cable broadcasting signal is delivered to conducting terminal through connecting flower seat plug company spends on the seat, ac voltage signal on company's flower seat is through first resistance current limliting, to the 5th shunt resistance ground connection, through diode, the ac voltage rectifier with wired broadcast singal is become direct voltage again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220321159 CN202663542U (en) | 2012-07-04 | 2012-07-04 | Automatic wired broadcast switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220321159 CN202663542U (en) | 2012-07-04 | 2012-07-04 | Automatic wired broadcast switching system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202663542U true CN202663542U (en) | 2013-01-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220321159 Expired - Fee Related CN202663542U (en) | 2012-07-04 | 2012-07-04 | Automatic wired broadcast switching system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202663542U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105451148A (en) * | 2015-01-15 | 2016-03-30 | 西安原创电子科技有限公司 | Broadcasting-signal-preferred multimedia teaching power amplifier |
| CN112289093A (en) * | 2020-11-06 | 2021-01-29 | 南阳理工学院 | English teaching listening comprehension play system |
-
2012
- 2012-07-04 CN CN 201220321159 patent/CN202663542U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105451148A (en) * | 2015-01-15 | 2016-03-30 | 西安原创电子科技有限公司 | Broadcasting-signal-preferred multimedia teaching power amplifier |
| CN112289093A (en) * | 2020-11-06 | 2021-01-29 | 南阳理工学院 | English teaching listening comprehension play system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU BILIPU ELECTRONIC CO., LTD. Free format text: FORMER OWNER: YANG ZIZHONG Effective date: 20131217 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 415900 CHANGDE, HUNAN PROVINCE TO: 510000 GUANGZHOU, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131217 Address after: 4, 510000 floor, Tai Tong Street, 10 Chung Lo North Road, Baiyun District, Guangdong, Guangzhou Patentee after: GUANGZHOU BILIPU ELECTRONIC CO., LTD. Address before: Hanshou City neighborhood 415900 Longyang County of Hunan Province town of eight groups Patentee before: Yang Zizhong |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20180704 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |