CN208971528U - A kind of college entrance examination hearing backup analog broadcast signal automatic switchover system - Google Patents
A kind of college entrance examination hearing backup analog broadcast signal automatic switchover system Download PDFInfo
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- CN208971528U CN208971528U CN201821863931.4U CN201821863931U CN208971528U CN 208971528 U CN208971528 U CN 208971528U CN 201821863931 U CN201821863931 U CN 201821863931U CN 208971528 U CN208971528 U CN 208971528U
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Abstract
The utility model discloses a kind of college entrance examination hearing backup analog broadcast signal automatic switchover systems, including test signal generating module, level pressure power amplifier module, test signal detection module, Web broadcast module, MCU and the first signal switching module and second signal switching module；Test signal generating module is connect with level pressure power amplifier module, Web broadcast module is connect with MCU and signal switching module respectively, MCU is connect with the first signal switching module and second signal switching module respectively, first signal switching module is connect with second signal switching module, and second signal switching module is connect with loudspeaker.The system is simple, reliably, suitable for broadcast terminal under college entrance examination listening environment is automatically switched between Web broadcast signal, the analog broadcast signal of backup and local public address signal automatically.
Description
Technical field
The utility model relates to public broadcasting technical field, especially a kind of college entrance examination hearing backup analog broadcast signal is automatic
Switching system.
Background technique
Public broadcasting carries the vital task for playing college entrance examination hearing content and examination instruction in college entrance examination examination process.One
Broadcast system breaks down in denier examination process, and examination will be unable to be normally carried out, and influences extremely severe.In this important broadcast
Field of employment can all prepare alternative scheme, once main system goes wrong will enable alternative scheme at once, guarantee that examination is unlikely
In interruption.There are two types of traditional alternative schemes, one is preparing portable player in advance, when examination broadcast is broken down,
Portable player is carried by supervisor and takes turns stream broadcasting to each room of examining, it is clear that this scheme can upset examination rhythm, influence
Examinee's state.Another scheme is then to build a set of analog broadcast system on the basis of original Web broadcast, is occurred in network
In the case where failure, broadcast terminal automatically switches to analog broadcasting broadcast, and conventional solution is passed by detection analog broadcasting
Defeated audio signal realizes Audio conversion, however the audio signal broadcasted is not all to send always, and necessarily there is pause in centre, leads
The result of cause is exactly that broadcast terminal is difficult judgement currently whether in examination process, and toggles between different signal source.
Utility model content
To solve problems of the prior art, the purpose of the utility model is to provide a kind of backups of college entrance examination hearing to simulate
Broadcast singal automatic switchover system, the system is simple, it is reliable, be suitable under college entrance examination listening environment broadcast terminal automatically in net
Automatically switched between network broadcast singal, the analog broadcast signal of backup and local public address signal.
A kind of college entrance examination hearing backup analog broadcasting that in order to achieve the above purposes, the technical solution adopted by the utility model is: letter
Number automatic switchover system, including test signal generating module, level pressure power amplifier module, test signal detection module, Web broadcast mould
Block, MCU and the first signal switching module and second signal switching module；
Signal generating module is tested, is connect for generating the test signal other than audio bandwidth, and with level pressure power amplifier module；
Level pressure power amplifier module is connect with test signal detection module, the analog broadcast signal for that will back up and test signal
The test signal that module generates occurs and is output to test signal detection module；
Signal detection module is tested, is connect respectively with second signal switching module and MCU, for rated power broadcast letter will to be simulated
Number and test signal exported respectively into second signal switching module and MCU；
Web broadcast module for receiving Web broadcast signal, while identifying network working condition, according to network work shape
State generates corresponding logical signal, and Web broadcast module connect with MCU and signal switching module respectively, for by logical signal with
Web broadcast signal is exported respectively to MCU and the first signal switching module；
MCU is connect with the first signal switching module and second signal switching module respectively, for generating the control of signal switching
Logical signal processed controls the output letter of the first signal switching module and second signal switching module by control logic signal
Number；
First signal switching module, by the control of the MCU control logic signal generated by Web broadcast signal or local
Public address signal is exported to second signal switching module；
Second signal switching module, by MCU generate control logic signal control will simulate rated power broadcast signal or
The output signal of first signal switching module is exported to loudspeaker and is played.
As a preferred embodiment, the test signal detection module includes step-down transformer, bandpass filter
And current rectifying and wave filtering circuit, the step-down transformer are connect with second signal switching module and bandpass filter respectively, bandpass filtering
Device is connect with current rectifying and wave filtering circuit again, and current rectifying and wave filtering circuit is connect with MCU again.
As another preferred embodiment, between first signal switching module and second signal switching module also
Equipped with power amplifier module.
As another preferred embodiment, the test signal generating module is Wien bridge circuit oscillating circuit.
As another preferred embodiment, first signal switching module is analog switch.
As another preferred embodiment, the analog switch is CD4052 chip.
As another preferred embodiment, the second signal switching switch is relay.
The beneficial effects of the utility model are: the utility model has been superimposed outside voiced band on simulation rated power broadcast signal
Test signal, even if in broadcasting process, audio signal have for a long time pause, broadcast terminal can also detect examination broadcast into
Row neither influences normal broadcast singal transmission, and can guarantee the continuity of examination process, will not be because of in examination process
Because being switched to other signals source without audio signal, only is stopping taking an examination, closing testing source, broadcast terminal just meeting
It is switched to other signals source.The backup broadcast singal that rated power broadcast signal is simulated as Web broadcast signal works, and ensure that net
Network program circuit breaks down, and can continue the simulation rated power broadcast signal for playing backup, improve the reliability of system.
Detailed description of the invention
Fig. 1 is the system block diagram of the utility model embodiment；
Fig. 2 is the structural block diagram that the utility model embodiment tests signal detection module.
Specific embodiment
The embodiments of the present invention are described in detail with reference to the accompanying drawing.
Embodiment
As inscribed shown in 1, mould occurs for a kind of college entrance examination hearing backup analog broadcast signal automatic switchover system, including test signal
Block, level pressure power amplifier module, test signal detection module, Web broadcast module, MCU and the first signal switching module and the second letter
Number switching module；
Signal generating module is tested, for generating the test signal other than audio bandwidth, because the signal is audio bandwidth
In addition, and amplitude is far smaller than the audio signal to broadcast, so will not have an adverse effect to the audio signal normally to broadcast, surveys
The Wien bridge circuit oscillating circuit that module is constructed using amplifier, which occurs, for trial signal can be realized, and connect with level pressure power amplifier module；
Level pressure power amplifier module is connect with test signal detection module, the analog broadcast signal for that will back up and test signal
The test signal that module generates occurs and is output to test signal detection module；
Signal detection module is tested, mainly for detection of the test signal of simulation rated power broadcast wire road, test signal inspection
Module is surveyed to connect with second signal switching module and MCU respectively, it is defeated for rated power broadcast signal and test signal difference will to be simulated
Out into second signal switching module and MCU；
Web broadcast module, the module are built in inside broadcast terminal, for receiving Web broadcast signal, while identifying net
Network working condition generates corresponding logical signal according to network working condition, and Web broadcast module switches with MCU and signal respectively
Module connection, for being exported logical signal and Web broadcast signal respectively to MCU and the first signal switching module；
MCU is connect with the first signal switching module and second signal switching module respectively, for generating the control of signal switching
Logical signal processed controls the output letter of the first signal switching module and second signal switching module by control logic signal
Number；
First signal switching module is mainly used for the audio signal of handover network broadcast singal and local public address input, leads to
Web broadcast signal or local public address signal are exported to second signal and switch mould by the control for crossing the control logic signal of MCU generation
Block；What it is due to the switching of the first signal switching module is the small signal of prime, so with common analog switch, such as double-pole four throw switch
CD4052 chip can be realized；
Second signal switching module is mainly used for switching the output signal of the first signal switching module and simulation rated power broadcast
Signal will simulate the defeated of rated power broadcast signal or the first signal switching module by the control of the MCU control logic signal generated
Signal is exported to loudspeaker and is played out；What it is due to the switching of second signal switching module is audio power signal, so using relay
It can be realized.
The working principle of the present embodiment is described in detail below:
Test signal generating module is connected to level pressure power amplifier module, and the analog broadcast signal of backup is enlarged into 100V together
Or the test signal detection module in broadcast terminal is connected to after 70V level pressure signal.Test signal detection module will be isolated
Test signal and simulation rated power broadcast signal are respectively outputted to MCU sampling identification and second signal switching module.Web broadcast mould
Block by the logical signal of the Web broadcast signal decoded and network working condition be respectively outputted to the first signal switching module and
MCU.First signal switching module is controlled by MCU, is selected from local public address signal and Web broadcast signal wherein all the way to wide
Second signal switching module is given in output after broadcasting the power amplifier module amplification in terminal.Second signal switching module also by the control of MCU,
It selects wherein to export all the way from the output signal of power amplifier module and the output signal of test signal detection module and gives loudspeaker hair
Sound.
When MCU, which determines Web broadcast by the logical signal that Web broadcast module exports, to broadcast, by controlling
Stating the first signal switching module and second signal switching module makes loudspeaker preferentially play Web broadcast signal；When MCU is detected
Web broadcast is interrupted, and when being detected simultaneously by the test signal of the test signal detection module output, will control first letter
Number switching module and second signal switching module make loudspeaker play the simulation rated power broadcast letter of level pressure power amplifier module output automatically
Number；When MCU detects that Web broadcast is interrupted, while the test signal of the test signal detection module output is not detected,
First signal switching module and second signal switching module, which will be controlled, makes loudspeaker play local public address signal automatically.
When Web broadcast interruption can be realized by above-mentioned control process, simulation rated power broadcast signal is automatically switched to, and
As long as the test signal generating module is not turned off, broadcast terminal would not break simulation rated power broadcast signal, even if level pressure
Program circuit does not have output audio signal, and other signals will not be switched in the broadcast gap of listening in this way by ensuring that
Source ensure that the continuity and reliability of broadcast.
In another preferred embodiment, as shown in Fig. 2, the test signal detection module includes downconverter
Device, bandpass filter and current rectifying and wave filtering circuit, the step-down transformer respectively with second signal switching module and bandpass filter
Connection, bandpass filter are connect with current rectifying and wave filtering circuit again, and current rectifying and wave filtering circuit is connect with MCU again.
Step-down transformer determines resistance signal for 100V or 70V level pressure signal to be transformed into, and step-down transformer output directly connects
Connect second signal switching module, while tape splicing bandpass filter；Tape splicing bandpass filter by what step-down transformer exported for determining simultaneously
Circuit noise and audio signal in resistance signal filter out, and retain the test signal of test signal generating module output；Rectifying and wave-filtering
The test signal that bandpass filter exports is transformed to direct current signal by circuit, and the DC signal output is detected to MCU.
Specific embodiment of the present utility model above described embodiment only expresses, the description thereof is more specific and detailed,
But it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the common of this field
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the protection scope of the utility model.
Claims (7)
1. a kind of college entrance examination hearing backup analog broadcast signal automatic switchover system, which is characterized in that mould occurs including test signal
Block, level pressure power amplifier module, test signal detection module, Web broadcast module, MCU and the first signal switching module and the second letter
Number switching module；
Signal generating module is tested, is connect for generating the test signal other than audio bandwidth, and with level pressure power amplifier module；
Level pressure power amplifier module with test signal detection module connect, for will the analog broadcast signal that backed up with test signal
The test signal that module generates is output to test signal detection module；
Test signal detection module, connect respectively with second signal switching module and MCU, for will simulate rated power broadcast signal with
Test signal is exported respectively into second signal switching module and MCU；
Web broadcast module for receiving Web broadcast signal, while identifying network working condition, is produced according to network working condition
Raw corresponding logical signal, Web broadcast module are connect with MCU and signal switching module respectively, are used for logical signal and network
Broadcast singal is exported respectively to MCU and the first signal switching module；
MCU is connect with the first signal switching module and second signal switching module respectively, and the control for generating signal switching is patrolled
Signal is collected, the output signal of the first signal switching module and second signal switching module is controlled by control logic signal；
First signal switching module, by the control of the MCU control logic signal generated by Web broadcast signal or local public address
Signal is exported to second signal switching module；
Second signal switching module will simulate rated power broadcast signal or first by the control of the MCU control logic signal generated
The output signal of signal switching module is exported to loudspeaker and is played.
2. college entrance examination hearing backup analog broadcast signal automatic switchover system according to claim 1, which is characterized in that described
Test signal detection module includes step-down transformer, bandpass filter and current rectifying and wave filtering circuit, the step-down transformer respectively with
Second signal switching module is connected with bandpass filter, and bandpass filter is connect with current rectifying and wave filtering circuit again, current rectifying and wave filtering circuit
It is connect again with MCU.
3. college entrance examination hearing backup analog broadcast signal automatic switchover system according to claim 1, which is characterized in that described
Power amplifier module is additionally provided between first signal switching module and second signal switching module.
4. college entrance examination hearing backup analog broadcast signal automatic switchover system according to claim 1, which is characterized in that described
Test signal generating module is Wien bridge circuit oscillating circuit.
5. college entrance examination hearing backup analog broadcast signal automatic switchover system according to claim 1, which is characterized in that described
First signal switching module is analog switch.
6. college entrance examination hearing backup analog broadcast signal automatic switchover system according to claim 5, which is characterized in that described
Analog switch is CD4052 chip.
7. college entrance examination hearing backup analog broadcast signal automatic switchover system according to claim 1, which is characterized in that described
Second signal switching switch is relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821863931.4U CN208971528U (en) | 2018-11-13 | 2018-11-13 | A kind of college entrance examination hearing backup analog broadcast signal automatic switchover system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821863931.4U CN208971528U (en) | 2018-11-13 | 2018-11-13 | A kind of college entrance examination hearing backup analog broadcast signal automatic switchover system |
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| CN208971528U true CN208971528U (en) | 2019-06-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111026585A (en) * | 2019-12-05 | 2020-04-17 | 四川湖山电器股份有限公司 | Storage server hot standby switching method in recording and broadcasting system |
| CN113905027A (en) * | 2021-12-10 | 2022-01-07 | 南昌航天广信科技有限责任公司 | Network signal priority transmission method, system, computer and readable storage medium |
| CN115334410A (en) * | 2022-07-29 | 2022-11-11 | 广东南控云图科技有限公司 | Embedded main/standby audio switching circuit |
-
2018
- 2018-11-13 CN CN201821863931.4U patent/CN208971528U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111026585A (en) * | 2019-12-05 | 2020-04-17 | 四川湖山电器股份有限公司 | Storage server hot standby switching method in recording and broadcasting system |
| CN111026585B (en) * | 2019-12-05 | 2023-03-17 | 四川湖山电器股份有限公司 | Storage server hot standby switching method in recording and broadcasting system |
| CN113905027A (en) * | 2021-12-10 | 2022-01-07 | 南昌航天广信科技有限责任公司 | Network signal priority transmission method, system, computer and readable storage medium |
| CN115334410A (en) * | 2022-07-29 | 2022-11-11 | 广东南控云图科技有限公司 | Embedded main/standby audio switching circuit |
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