CN101296043A - Addressable educational broadcast system - Google Patents
Addressable educational broadcast system Download PDFInfo
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- CN101296043A CN101296043A CNA2008100315171A CN200810031517A CN101296043A CN 101296043 A CN101296043 A CN 101296043A CN A2008100315171 A CNA2008100315171 A CN A2008100315171A CN 200810031517 A CN200810031517 A CN 200810031517A CN 101296043 A CN101296043 A CN 101296043A
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Abstract
The invention discloses an addressable teaching broadcast system, consisting of a multimedia computer, a sound source, a digital encoder, an intelligent broadcast decoder, a sound box and an automatic fault off-line circuit, wherein, a broadcast system software is arranged in the multimedia computer and connected with the digital encoder, an input end of the digital encoder is connected with an output end of the sound source, the output end of the digital encoder is connected with the input end of the intelligent broadcast decoder, and the output end of the intelligent broadcast decoder is connected with the sound box which restores a signal from the sound source into a sound. The automatic fault off-line circuit is connected with the intelligent broadcast decoder to prevent partial failure and guarantee normal broadcast of the broadcast system. The system changes the traditional form of the school broadcast in the past and has the advantages of simple and reliable structure, flexible and practical configuration, humanized operation, high quality, economy, stability, and practicality, etc.
Description
Technical field
The invention belongs to broadcast system, be specifically related to a kind of addressable educational broadcast system.
Background technology
Broadcast system is one of each indispensable infrastructure of school, although video technique and network technology were in development at full speed in recent years, broadcast system is still used by all kinds of school with its practicality, economy, convenience.The existing all kinds of schools of China all have Public Address system basically, and it is mainly used in various public arenas, as hold whole school activity, notify, raise national flag, setting-up exercises during the break, broadcasting break music, praise advanced, hold whole school's conference etc.Limited by resources supplIes, Web broadcast (communication protocol is the TCP/IP pattern) then has real time delay, technical sophistication, investment is big, difficult in maintenance, whether most middle and primary schools are difficult to realize, and common radio network often can only be play a kind of source of sound and play simultaneously in all classrooms, can't control certain certain classroom, zone arbitrarily needs broadcasting.Continuous development along with modern information technologies, multimedia teaching in vast, constantly the popularizing of primary school, utilize broadcast system to carry out the demand of music tone ringer, phonetic teaching in continuous increase, particularly music tone ringer popularizes, the enforcement of English Listening Comprehension examination etc. are all had higher requirement to the function of system of existing school broadcasting, capacity, tonequality, intelligent level, economy etc.
Summary of the invention
In view of the foregoing, the object of the present invention is to provide a kind of high-quality, economy, stable, practical, again can be at the addressable educational broadcast system of the enterprising pedestrian's machine of computer interface conversational mode.
Purpose of the present invention is achieved through the following technical solutions:
Addressable educational broadcast system is made up of multimedia computer, source of sound, digital encoder, intelligent broadcast decoder and audio amplifier and automatic fault off-line circuit; Broadcast system software is installed in the multimedia computer to be connected with digital encoder, the input of the output termination digital encoder of source of sound, the input of the output termination intelligent broadcast decoder of digital encoder, the output termination audio amplifier of intelligent broadcast decoder, by audio amplifier sound source signal is reduced into sound, automatic fault off-line circuit is connected with the intelligent broadcast decoder and is used to prevent that local fault from guaranteeing the normal broadcast of broadcast system.
The present invention uses that multimedia computer, VB software programming technique, single-chip microcomputer encoding and decoding technique etc. are soft, hardware organically combines, and the best solution of school's intelligent broadcast is provided.The multipath audio signal of digital program source or analog program source output is handled through digital encoder and is directly given the intelligent broadcast decoder in the addressable educational broadcast system.Selection that classroom, teaching material, class hour arrange in the school and switch-over control signal then are total to the cable transmission by computer by RS232 serial ports and audio signal and deliver to the intelligent broadcast decoder, send into audio amplifier nearby by carrying out power amplifier after the intelligent broadcast decoder processes, solved mutual interference problem preferably.
The wiring of this addressable educational broadcast system is simple, only just can finish multiple source of sound and not disturb real-time broadcast simultaneously mutually with a twisted-pair feeder (bus), and each class can combination in any receives the i.e. level per year of arbitrary source of sound, the classroom, the broadcasting of teaching material is selected and switching controls by the multimedia computer human-computer dialogue, also has the function of regularly playing, automatic fault detects, automatic offline functionality, thereby realize the broadcast system automation of broadcast continuity. intellectual management, it has changed the traditional form of school broadcasting in the past, have simple and reliable for structure, the flexible configuration practicality, user-friendly for operation and high-quality, economical, stable, advantages such as practicality.It is applicable to the needs of modern teaching education, is a kind of indispensable teaching instrument and equipment of realizing educational modernization.
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is a composition frame chart of the present invention.
Fig. 2 is the circuit diagram of digital encoder among the present invention.
Fig. 3 is the circuit diagram of intelligent broadcast decoder among the present invention.
Embodiment
Addressable educational broadcast system of the present invention is made up of multimedia computer 1, source of sound 2, digital encoder 3, intelligent broadcast decoder 4 and audio amplifier 5 and automatic fault off-line circuit 6 as shown in Figure 1.Dress broadcast system software is connected with digital encoder 3 in the multimedia computer 1, the input of the output termination digital encoder 3 of source of sound 2, the input of the output termination intelligent broadcast decoder 4 of digital encoder 3, the output termination audio amplifier 5 of intelligent broadcast decoder 4, by audio amplifier 5 sound source signal is reduced into sound, and automatic fault off-line circuit 6 is connected with intelligent broadcast decoder 4 and can excises the normal broadcast that local fault guarantees broadcast system.
Operation principle of the present invention is described as follows:
The multimedia computer 1 that broadcast system software is housed is the core in the native system, during operation, on the indicator screen of multimedia computer 1 man-machine dialog interface is arranged, can the corresponding title of grouping and each terminal be set according to the actual distribution situation in each school's floor and classroom on man-machine dialog interface during first install software.Can select and switching controls according to School Grade, classroom, teaching material during use, need not the Audio Matrix switch, only control command is inserted bus (twisted-pair feeder) from serial communication interface output by the computer run Control Software, its source of sound audio signal is also delivered in the digital encoder 3 by bus and is encoded, circuit amplifies and volume is regulated, control command is delivered to intelligent broadcast decoder 4 simultaneously by bus, just can finish the non-interfering real-time transmission of multiple source of sound, broadcast, and can combination in any and the arbitrary source of sound of reception.Another feature of native system is also to have the function of regularly playing by setting, thereby realizes playing automation. intellectual management:
Source of sound 2 in the system is made up of as source of sound multiple audio signals such as DVD, recorder, broadcast receiver, cable TV and network audio, microphone apparatus and is sent into digital encoder 3 and controlled by multimedia computer 1:
The audio input end of digital encoder 3 (multichannel source of sound A, B, C, D) is connected to the output of above-mentioned source of sound 2 equipment, and the via line amplifying circuit is to bus.Its (PC) control input end is connected to multimedia computer 1 communication interface, the audio signal electronic circuit that single-chip microcomputer constituted in digital encoder 3 is carried out multimedia computer it is carried out seven grades of volume controls and has arranged to intercut controlled function (MIC end), so just, can insert broadcasting to arbitrary source of sound when needed, the T+ that digital encoder 3 same acceptance send from bus, T-control signal (seeing Fig. 2 for details).
Audio amplifier 5 is received the power amplifier output of above-mentioned intelligent broadcast decoder 4, is placed in the place that classroom or audience need, and audio signal is reduced into sound.
Native system has automatic fault detection, and automatic fault off-line circuit 6 can detect network data communication situation (seeing Fig. 3 for details) very easily.
The digital encoder operation principle:
See Fig. 2, digital encoder is RS-485 interface circuit 1, RS-485 interface circuit 2 by RS-232 interface circuit, two RS-485 interface circuits, and one-chip machine port circuit (I/O interface), MIC intercut circuit, sounding circuit A (the electronic sound volume adjusting of circuit amplification 1, IC2 and RP1 composition), sounding circuit B (the electronic sound volume adjusting of circuit amplification 2, IC3 and RP2 composition), sounding circuit C (the electronic sound volume adjusting of circuit amplification 3, IC4 and RP3 composition), sounding circuit D (the electronic sound volume adjusting of circuit amplification 4, IC5 and RP4 composition) composition.
Its principle: relay K 4 contacts do not disconnect when switching on, and signal control line is in open-circuit condition, avoid the external interference signal on the signal control line that RS-485 and singlechip chip are destroyed; Relay contact closure during energising, the circuit operate as normal.The PC communication port through the RS-232 interface circuit, converts RS-485 signal controlling single-chip microcomputer to,
MIC intercuts circuit: single-chip microcomputer (89C51) IC1 wherein port controlling MIC switches to arbitrary source of sound A, B, C, D input.To realize that microphone intercuts.
The electronic sound volume control circuit: single-chip microcomputer (89C51) IC2, IC3, IC4, IC5 change A, B, each source of sound resistance to earth RP1 of C, D, RP2, RP3, RP4, realize that the source of sound input current changes, thereby volume is changed.
The intelligent broadcast decoder is made up of single chip circuit, RS-485 interface circuit, automatic source of sound commutation circuit, automatic testing circuit, power amplifier as shown in Figure 3.
Operation principle: adopt bus (twisted-pair feeder) to transmit multipath audio signal and T+ simultaneously, the T-control signal.Except that audio frequency ground wire and data ground wire, other six roots of sensation line is connected in the circuit after by the K1-K3 relay contact again
K1 and K2 are that signal is selected transfer relay.By Single-chip Controlling.Have four kinds of states, select source of sound A respectively, B, C, a road in D four tunnel audio signals are sent to power amplifier.Light light-emitting diode corresponding on the panel simultaneously.Single-chip microcomputer also feeds back to multimedia computer with selection result by T+, T-signal control line, and shows on the multimedia computer screen.
Automatic fault off-line circuit:
K3 is the off-line control relay, and when singlechip chip broke down, control relay cut off self RS-485 communication line, leaves bus automatically, makes it not influence other decoding terminal operate as normal.Operation principle: relay K 3 contacts do not disconnect when switching on, and signal control line is in open-circuit condition, avoid the external interference signal on the signal control line that RS-485 and singlechip chip are destroyed; Relay contact closure during energising, the circuit operate as normal is formed the single-chip microcomputer failure detector circuit by voltage comparator ic 2, but when singlechip chip had fault, detection port voltage descended, comparator IC2 output low level, and relay K 3 adhesives, the contact disconnects.Out of order decoding terminal and bus are isolated.Malfunction indicator lamp (D1) on the panel is bright simultaneously.
Claims (1)
1, a kind of addressable educational broadcast system is characterized in that being made up of multimedia computer, source of sound, digital encoder, intelligent broadcast decoder and audio amplifier and automatic fault off-line circuit; Broadcast system software is installed in the multimedia computer to be connected with digital encoder, the input of the output termination digital encoder of source of sound, the input of the output termination intelligent broadcast decoder of digital encoder, the output termination audio amplifier of intelligent broadcast decoder, by audio amplifier sound source signal is reduced into sound, automatic fault off-line circuit is connected with the intelligent broadcast decoder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100315171A CN101296043A (en) | 2008-06-17 | 2008-06-17 | Addressable educational broadcast system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100315171A CN101296043A (en) | 2008-06-17 | 2008-06-17 | Addressable educational broadcast system |
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| CN101296043A true CN101296043A (en) | 2008-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100315171A Pending CN101296043A (en) | 2008-06-17 | 2008-06-17 | Addressable educational broadcast system |
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Cited By (5)
| 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 |
| CN106658330A (en) * | 2016-12-30 | 2017-05-10 | 广州市保伦电子有限公司 | Audio detection switching module and system |
| CN108650580A (en) * | 2018-05-02 | 2018-10-12 | 广州莱拓智能科技有限公司 | Internet of Things sound integral machine and sound source switching method, device |
| CN108806731A (en) * | 2018-06-07 | 2018-11-13 | 江苏中协智能科技有限公司 | A kind of audio devices and method for English Listening Comprehension examination |
| CN110492957A (en) * | 2019-08-26 | 2019-11-22 | 中车株洲电力机车研究所有限公司 | A kind of system and method merging intelligence rail electric car column adjusting system and vehicle-mounted broadcasting system |
-
2008
- 2008-06-17 CN CNA2008100315171A patent/CN101296043A/en active Pending
Cited By (6)
| 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 |
| CN106658330A (en) * | 2016-12-30 | 2017-05-10 | 广州市保伦电子有限公司 | Audio detection switching module and system |
| CN108650580A (en) * | 2018-05-02 | 2018-10-12 | 广州莱拓智能科技有限公司 | Internet of Things sound integral machine and sound source switching method, device |
| CN108806731A (en) * | 2018-06-07 | 2018-11-13 | 江苏中协智能科技有限公司 | A kind of audio devices and method for English Listening Comprehension examination |
| CN108806731B (en) * | 2018-06-07 | 2019-05-24 | 江苏中协智能科技有限公司 | A kind of audio devices and method for English Listening Comprehension examination |
| CN110492957A (en) * | 2019-08-26 | 2019-11-22 | 中车株洲电力机车研究所有限公司 | A kind of system and method merging intelligence rail electric car column adjusting system and vehicle-mounted broadcasting system |
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Open date: 20081029 |