CN105471536B - A kind of broadcast system control circuit - Google Patents
A kind of broadcast system control circuit Download PDFInfo
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- CN105471536B CN105471536B CN201511012853.8A CN201511012853A CN105471536B CN 105471536 B CN105471536 B CN 105471536B CN 201511012853 A CN201511012853 A CN 201511012853A CN 105471536 B CN105471536 B CN 105471536B
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- 238000002955 isolation Methods 0.000 claims abstract description 58
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 230000005236 sound signal Effects 0.000 claims abstract description 16
- 239000011324 bead Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 10
- 230000005669 field effect Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
- H04H60/14—Arrangements for conditional access to broadcast information or to broadcast-related services
- H04H60/16—Arrangements for conditional access to broadcast information or to broadcast-related services on playing information
Abstract
The present invention is a kind of broadcast system control circuit, the circuit includes connection the first power isolation module of power end and second source isolation module, the second source isolation module is connected and is powered to priority judgment module, the priority judgment module connects and detects the voltage in UIC5 and UIC6 buses in real time, the signal input part of the signal priority output terminal connection light-coupled isolation module of priority judgment module, the control signal input of the signal output end connection simulation handover module of the light-coupled isolation module, the audio signal input end of the simulation handover module is connected with multipath audio signal, first power isolation module connects and respectively to light-coupled isolation module and simulation handover module power supply.The present invention realizes the real-time judge of priority on broadcast bus, effectively reduces the influence to radio voice, and the other voice of different priorities is avoided mutually to go here and there problem.
Description
Technical field
The invention belongs to the vehicle-mounted broadcasting systems technology fields of rail traffic, and in particular to a kind of broadcast system control electricity
Road.
Background technology
In train broadcasting system, voice output needs to judge priority according to the 24V voltages on broadcast bus, excellent
The low meeting of first rank is preferentially reported the high voice of priority level by the high barge of priority level.Or in driver master
End manually needs intercommunication call temporarily to interrupt, MIC voices is cut broadcast bus during broadcast.It will be all the way or several with regard to needs
Road source of sound according to priority selects to be linked into bus or system.Existing technical solution has several point defects：1. priority judges electricity
Road is generally made of optocoupler and is isolated, and for detection in real time（24V）Voltage, but since every section compartment is required for detecting, and
And direct current flag bit is had on broadcast bus sometimes（24V）Situation about being shared with radio voice signal, optocoupler are current devices, meeting
Seriously affect the quality of radio voice.2. switching circuit, relay has mechanical switch sound when switching and enters guest room loud speaker, and
And machinery can be lost in long-time；And it will appear the feelings of the other voice mixing of different priorities together when simulating switching
Condition.It solves the above problems, the detection circuit input impedance for needing every section compartment is big as possible, and big arrive carries out reconnection in train
When, the quality of radio voice is had little effect, while reasonable selection audio input transformer, improve switching circuit and come into one
Step improves the quality of broadcasting speech.
Invention content
The object of the present invention is to overcome the problems of the prior art, provides a kind of broadcast system control circuit.
To realize above-mentioned technical purpose and the technique effect, the invention is realized by the following technical scheme：
A kind of broadcast system control circuit, the circuit include the first power isolation module and second source of connection power end
Isolation module, the second source isolation module are connected and are powered to priority judgment module, and the priority judgment module connects
Connect and in real time detect UIC5 and UIC6 buses on voltage, priority judgment module signal priority output terminal connection optocoupler every
Signal input part from module, the control signal input of the signal output end connection simulation handover module of the light-coupled isolation module
End, the audio signal input end of the simulation handover module are connected with multipath audio signal, first power isolation module point
It Lian Jie and not power to light-coupled isolation module and simulation handover module.
Further, first power isolation module is by power isolation module U2, magnetic bead B3, capacitance C36 and capacitance C7
Composition, the other end of one end ground terminal G1 of C36, C36, which are connected with the positive terminal BAT+ of input power and access the 1 of U2, manages
Foot, 6 pins of 2 pin the ground terminal G1, U2 of U2 connect one end of C7 and magnetic bead B3, the other end of C7 and 4 pins of U2 respectively
It is connected and the other end of ground terminal G2, magnetic bead B3 is the first power output end VCCA；
The second source isolation module is made of power isolation module U14, magnetic bead B4, capacitance C37 and capacitance C38, C37
One end ground terminal G1, the other end of C37 is connected with the positive terminal BAT+ of input power and accesses 1 pin of U14, the 2 of U14
6 pins of pin ground terminal G1, U14 connect one end of C38 and magnetic bead B4 respectively, and the other end of C38 is connected with 4 pins of U14
And the other end of ground terminal G3, magnetic bead B4 are second source output terminal VCCB；
The priority judgment module is made of metal-oxide-semiconductor field effect transistor Q5, resistance R49 and resistance R50, the light-coupled isolation mould
Block is made of optocoupler U15, resistance R51 and resistance R52, and one end of R51 is connected with second source output terminal VCCB, and R51's is another
End is connected with 1 pin of U15, one end connection UIC6 of one end connection UIC5, R50 of R49, the other end of R49 and one end of R50
It is connected, the public connecting end of the other end ground terminal G3, R49 and R50 of R50 are connected with the grid G of Q5, the source S ground terminal of Q5
3 pins of the drain D connection U15 of G3, Q5, R52 one end connects 6 pins of the first power output end VCCA and U15, R52 simultaneously
The other end be connected with 5 pins of U15 and be used as signal OP output terminals, the 4 pin ground terminal G2 of U15；
The simulation handover module is by a switching circuit and multiple voltage follower circuit structures as switching circuit prime
Into the voltage follower circuit is by amplifier U5124B, amplifier U5125B, amplifier U5126B, capacitance C45, capacitance C46, capacitance
C47, capacitance C48, resistance R638, resistance R639, resistance R640, resistance R641, resistance R642 and resistance R643 compositions, it is described to cut
It changes electric route handoff chip U5127, capacitance C49, capacitance C50, resistance R644, resistance R645 and resistance R646 to form, the one of C47
One end of the other end connection R642 of end connection audio signal end SIGNAL1, C47, the other end of R642 is simultaneously with U5126B's
6th anti-phase input pin, one end of R643, C48 one end be connected, the other end of another termination R643 of C48 and and U5126B
The 7th output pin be connected, one end of the other end connection R640 of one end of C45 connection audio signal end SIGNAL2, C45,
The one end of the other end of R640 simultaneously with the 6th anti-phase input pin of U5125B, one end of R641, C46 is connected, and R641's is another
It terminating the other end of C46 and is connected with the 7th output pin of U5125B, one end of R638 connects the first power output end VCCA,
The other end of R638 is connected simultaneously with one end of R639, the 5th non-inverting input pin of U5124B, the other end ground terminal of R639
The 6th anti-phase input pin of G2, U5124B connect its 7th output pin, the 7th output pin of U5124B respectively with U5126B and
The 5th non-inverting input pin of U5125B is connected, one end of the 7th output pin connection R646 of U5126B, the 7th output of U5125B
One end of pin R645,6 pins of the other end connection U5127 of R646,4 pins of another termination U5127 of R645, R644's
One end connection signal OP output terminals, 1 pin of the other end connection U5127 of R644,2 pins and the of a termination U5127 of C50
5 pipes of 3 pins of the other end connection U5127 of one power output end VCCA, C50 and one end connection U5127 of ground terminal G2, C49
Foot, the other end of C49 is as audio signal output end SIGNALCOM.
Further, it is respectively equipped with the first power supply instruction in first power isolation module and second source isolation module
Circuit and second source indicating circuit, wherein, the first power indicating circuit is made of resistance R47 and Light-emitting diode LED 1, R47
One end connect the first power output end VCCA, R47 the other end connection LED1 positive terminal, the negative phase end ground terminal of LED1
G2, second source indicating circuit are made of resistance R48 and Light-emitting diode LED 2, one end connection second source output terminal of R48
The positive terminal of the other end connection LED2 of VCCB, R48, the negative phase end ground terminal G3 of LED2.
Further, the metal-oxide-semiconductor field effect transistor Q5 in the priority judgment module is N-channel MOS field-effect tube.
Further, the ground terminal G1 is power supply ground terminal, and ground terminal G2 is system ground terminal, and ground terminal G3 is isolation ground terminal.
The beneficial effects of the invention are as follows:
1. circuit using the present invention, the voice that being achieved multichannel ON TRAINS has priority level switches, and reach
To radio voice quality is not influenced in the case of being detected in real time in priority level, multi-path voice is realized without crosstalk；
2. the switching circuit of the present invention can set multiple voltage follower circuits, the extension of input signal is carried out, it can be defeated to multichannel
Enter the control output that signal carries out priority.
3. with the good isolation between system, the stability and reliability of system are improved, is reduced due to long-term machinery
The integrity problem brought is lost, and with good economic benefit.
Description of the drawings
Fig. 1 is the logic diagram of circuit of the present invention；
Fig. 2 is the circuit diagram of the first power isolation module；
Fig. 3 is the circuit diagram of second source isolation module；
Fig. 4 is priority judgment module and the circuit diagram of light-coupled isolation module；
Fig. 5 is the circuit diagram for simulating handover module.
Specific embodiment
It is below with reference to the accompanying drawings and in conjunction with the embodiments, next that the present invention will be described in detail.
With reference to shown in Fig. 1, a kind of broadcast system control circuit, the circuit includes the first isolated from power mould of connection power end
Block and second source isolation module, the second source isolation module are connected and are powered to priority judgment module, described preferential
Grade judgment module connects and detects the voltage in UIC5 and UIC6 buses in real time, the signal priority output of priority judgment module
The signal input part of end connection light-coupled isolation module, the signal output end connection simulation handover module of the light-coupled isolation module
Control signal input, the audio signal input end of the simulation handover module are connected with multipath audio signal, first electricity
Source isolation module connects and respectively to light-coupled isolation module and simulation handover module power supply.
With reference to shown in Fig. 2, first power isolation module is by power isolation module U2, magnetic bead B3, capacitance C36 and capacitance
C7 is formed, and the other end of one end ground terminal G1 of C36, C36, which are connected with the positive terminal BAT+ of input power and access the 1 of U2, manages
Foot, 6 pins of 2 pin the ground terminal G1, U2 of U2 connect one end of C7 and magnetic bead B3, the other end of C7 and 4 pins of U2 respectively
It is connected and the other end of ground terminal G2, magnetic bead B3 is the first power output end VCCA；
With reference to shown in Fig. 3, the second source isolation module is by power isolation module U14, magnetic bead B4, capacitance C37 and electricity
Hold C38 compositions, the other end of one end ground terminal G1 of C37, C37 are connected with the positive terminal BAT+ of input power and access U14
1 pin, 6 pins of 2 pin the ground terminal G1, U14 of U14 connect one end of C38 and magnetic bead B4 respectively, the other end of C38 and
4 pins of U14 are connected and the other end of ground terminal G3, magnetic bead B4 are second source output terminal VCCB；
With reference to shown in Fig. 4, the priority judgment module is made of metal-oxide-semiconductor field effect transistor Q5, resistance R49 and resistance R50, institute
It states light-coupled isolation module to be made of optocoupler U15, resistance R51 and resistance R52, one end and the second source output terminal VCCB phases of R51
Even, the other end of R51 is connected with 1 pin of U15, and one end connection UIC6 of one end connection UIC5, R50 of R49, R49's is another
End is connected with one end of R50, and the public connecting end of the other end ground terminal G3, R49 and R50 of R50 are connected with the grid G of Q5, Q5
Source S ground terminal G3, Q5 drain D connection U15 3 pins, R52 one end simultaneously connect the first power output end VCCA and
6 pins of U15, the other end of R52 are connected with 5 pins of U15 and are used as signal OP output terminals, the 4 pin ground terminal G2 of U15；
With reference to shown in Fig. 5, the simulation handover module is by a switching circuit and multiple electricity as switching circuit prime
Pressure follows circuit to form, and the voltage follower circuit is by amplifier U5124B, amplifier U5125B, amplifier U5126B, capacitance C45, electricity
Hold C46, capacitance C47, capacitance C48, resistance R638, resistance R639, resistance R640, resistance R641, resistance R642 and resistance R643
Composition, the switching circuit is by switching chip U5127, capacitance C49, capacitance C50, resistance R644, resistance R645 and resistance R646
Composition, one end of the other end connection R642 of one end connection audio signal the end SIGNAL1, C47 of C47, the other end of R642 are same
When be connected with one end of the 6th anti-phase input pin of U5126B, one end of R643, C48, another termination R643's of C48 is another
It holds and is connected with the 7th output pin of U5126B, the other end connection of one end connection audio signal the end SIGNAL2, C45 of C45
One end of R640, the other end of R640 simultaneously with the 6th anti-phase input pin of U5125B, one end of R641, C46 one end phase
Even, the other end of another termination C46 of R641 is simultaneously connected with the 7th output pin of U5125B, the first electricity of one end connection of R638
The other end of source output terminal VCCA, R638 are connected simultaneously with one end of R639, the 5th non-inverting input pin of U5124B, R639's
The 6th anti-phase input pin of the other end ground terminal G2, U5124B connect its 7th output pin, the 7th output pin point of U5124B
It is not connected with the 5th non-inverting input pin of U5126B and U5125B, one end of the 7th output pin connection R646 of U5126B,
One end of the 7th output pin R645 of U5125B, 6 pins of the other end connection U5127 of R646, another termination of R645
4 pins of U5127, one end connection signal OP output terminals of R644,1 pin of the other end connection U5127 of R644, the one of C50
Terminate 2 pins of U5127 and other end connection 3 pins of U5127 and ground terminal G2, C49 of the first power output end VCCA, C50
One end connection U5127 5 pins, the other end of C49 is as audio signal output end SIGNALCOM.
The first power indicating circuit and are respectively equipped in first power isolation module and second source isolation module
Two power indicating circuits, wherein, the first power indicating circuit is made of resistance R47 and Light-emitting diode LED 1, and one end of R47 connects
Connect the positive terminal of the other end connection LED1 of the first power output end VCCA, R47, the negative phase end ground terminal G2 of LED1, the second electricity
Source indicating circuit is made of resistance R48 and Light-emitting diode LED 2, one end connection second source output terminal VCCB of R48, R48's
The other end connects the positive terminal of LED2, the negative phase end ground terminal G3 of LED2.
Metal-oxide-semiconductor field effect transistor Q5 in the priority judgment module is N-channel MOS field-effect tube.
The ground terminal G1 is power supply ground terminal, and ground terminal G2 is system ground terminal, and ground terminal G3 is isolation ground terminal.
The principle of the invention
1st, power circuit part：The power supply that first power isolation module and second source isolation module form two-way independence is defeated
Go out, C37, two power filtering capacitors of C36 make input power pure；C7, C38 are respectively filtered two-way power supply, after guarantee
The power good of grade circuit；Two magnetic beads of B3, B4 are respectively as the isolation of two-way power unit；R47, LED1 and R48, LED2 points
Not Zu Cheng two-way out-put supply instruction, it is whether normal for detecting out-put supply.
2nd, priority decision circuitry part：Two resistance of R49, R50 resistance value needs select it is sufficiently large, shunting it is small, so as to
In in 24V voltages on detecting bus, and at the same time when having radio voice in bus, the quality of intercommunication call is not influenced；
Q5 is needed using voltage-type device, to coordinate the detection mode of the low current of front；U15 plays buffer action, is total to Account Dept
Ground ensures the stabilization of system；R51 is the current-limiting resistance of U15 internal illumination diodes, and R52 is the current limliting of light-sensitive device inside U15
Resistance, when there is 24V in bus, Q5 conductings so as to which optocoupler U15 is connected, export a signal OP to realize cutting for priority
It changes.
3rd, simulation switching circuit part：U5124B is an operational amplifier, and the connection of this side is as a voltage follow
Device uses, and the identical resistance of two resistance values of R638, R639 divides VCCA, forms 1/2VCCA, the shape after voltage follower
The reference offset power supply sufficiently small into an internal resistance, is supplied to U5126B, and two operational amplifiers of U5125B provide 1/2VCC electricity
Source；Two capacitance of C47, C45 be used for signal between AC coupled, make bias voltage not on other grades influence, R642, R643 and
Two groups of resistance of R640, R641 are respectively intended to adjust the output gain of two groups of operational amplifiers；C46, C48 are used for can in elimination system
Self-oscillation existing for energy；The resistance value of two resistance of R646, R645 can be set according to the amplitude of actual signal, in order to protect
Protecting this switching of U5127 IC, C49 makes signal realize AC coupled, and the bias voltage between isolation level and grade stablizes system,
R644 is current-limiting resistance, and C50 is filter capacitor, and pure power supply is provided for U5127.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of broadcast system control circuit, it is characterised in that：The circuit includes the first power isolation module of connection power end
With second source isolation module, the second source isolation module is connected and is powered to priority judgment module, the priority
Judgment module connects and detects the voltage in UIC5 and UIC6 buses, the signal priority output terminal of priority judgment module in real time
Connect the signal input part of light-coupled isolation module, the control of the signal output end connection simulation handover module of the light-coupled isolation module
Signal input part processed, the audio signal input end of the simulation handover module are connected with multipath audio signal, first power supply
Isolation module connects and respectively to light-coupled isolation module and simulation handover module power supply；
First power isolation module is made of power isolation module U2, magnetic bead B3, capacitance C36 and capacitance C7, one end of C36
The other end of ground terminal G1, C36 are connected with the positive terminal BAT+ of input power and access 1 pin of U2, and 2 pins of U2 are grounded
G1 is held, 6 pins of U2 connect one end of C7 and magnetic bead B3 respectively, and the other end of C7 is connected with 4 pins of U2 and ground terminal G2, magnetic
The other end of pearl B3 is the first power output end VCCA；
The second source isolation module is made of power isolation module U14, magnetic bead B4, capacitance C37 and capacitance C38, and the one of C37
The other end of termination ground terminal G1, C37 is connected with the positive terminal BAT+ of input power and accesses 1 pin of U14,2 pins of U14
6 pins of ground terminal G1, U14 connect one end of C38 and magnetic bead B4 respectively, and the other end of C38 is connected and connects with 4 pins of U14
The other end of ground terminal G3, magnetic bead B4 are second source output terminal VCCB；
The priority judgment module is made of metal-oxide-semiconductor field effect transistor Q5, resistance R49 and resistance R50, the light-coupled isolation module by
Optocoupler U15, resistance R51 and resistance R52 compositions, one end of R51 is connected with second source output terminal VCCB, the other end of R51 with
1 pin of U15 is connected, one end connection UIC6 of one end connection UIC5, R50 of R49, the other end of R49 and one end phase of R50
Even, the public connecting end of the other end ground terminal G3, R49 and R50 of R50 are connected with the grid G of Q5, the source S ground terminal G3 of Q5,
3 pins of the drain D connection U15 of Q5, R52 one end connect 6 pins of the first power output end VCCA and U15 simultaneously, and R52's is another
One end is connected with 5 pins of U15 and is used as signal OP output terminals, the 4 pin ground terminal G2 of U15；
The simulation handover module is made of a switching circuit and multiple voltage follower circuits as switching circuit prime, institute
Voltage follower circuit is stated by amplifier U5124B, amplifier U5125B, amplifier U5126B, capacitance C45, capacitance C46, capacitance C47, capacitance
C48, resistance R638, resistance R639, resistance R640, resistance R641, resistance R642 and resistance R643 composition, the switching circuit by
Switch chip U5127, capacitance C49, capacitance C50, resistance R644, resistance R645 and resistance R646 compositions, one end connection sound of C47
One end of the other end connection R642 of frequency signal end SIGNAL1, C47, the other end of R642 are defeated with the 6th reverse phase of U5126B simultaneously
Enter pin, one end of R643, C48 one end be connected, the other end of another termination R643 of C48 simultaneously the 7th is exported with U5126B
Pin is connected, and one end of the other end connection R640 of one end connection audio signal the end SIGNAL2, C45 of C45, R640's is another
The one end of end simultaneously with the 6th anti-phase input pin of U5125B, one end of R641, C46 is connected, another termination C46's of R641
The other end is simultaneously connected with the 7th output pin of U5125B, and one end of R638 connects the another of the first power output end VCCA, R638
End is connected simultaneously with one end of R639, the 5th non-inverting input pin of U5124B, the other end ground terminal G2 of R639, U5124B's
6th anti-phase input pin connects its 7th output pin, the 7th output pin of U5124B respectively with U5126B and U5125B the 5th
Non-inverting input pin is connected, one end of the 7th output pin connection R646 of U5126B, the 7th output pin R645's of U5125B
One end, 6 pins of the other end connection U5127 of R646,4 pins of another termination U5127 of R645, one end connection letter of R644
Number OP output terminals, 1 pin of the other end connection U5127 of R644,2 pins of a termination U5127 of C50 and the output of the first power supply
5 pins of VCCA, 3 pins of the other end connection U5127 of C50 and one end connection U5127 of ground terminal G2, C49 are held, C49's is another
One end is as audio signal output end SIGNALCOM；
The first power indicating circuit and the second electricity are respectively equipped in first power isolation module and second source isolation module
Source indicating circuit, wherein, the first power indicating circuit is made of resistance R47 and Light-emitting diode LED 1, one end of R47 connection the
The positive terminal of the other end connection LED1 of one power output end VCCA, R47, the negative phase end ground terminal G2 of LED1, second source refer to
Show that electric routing resistance R48 and Light-emitting diode LED 2 form, one end connection second source the output terminal VCCB's, R48 of R48 is another
The positive terminal of end connection LED2, the negative phase end ground terminal G3 of LED2；
Metal-oxide-semiconductor field effect transistor Q5 in the priority judgment module is N-channel MOS field-effect tube.
2. broadcast system control circuit according to claim 1, it is characterised in that：The ground terminal G1 be power supply ground terminal, ground
End G2 is system ground terminal, and ground terminal G3 is isolation ground terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511012853.8A CN105471536B (en) | 2015-12-31 | 2015-12-31 | A kind of broadcast system control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511012853.8A CN105471536B (en) | 2015-12-31 | 2015-12-31 | A kind of broadcast system control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN105471536A CN105471536A (en) | 2016-04-06 |
| CN105471536B true CN105471536B (en) | 2018-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201511012853.8A Active CN105471536B (en) | 2015-12-31 | 2015-12-31 | A kind of broadcast system control circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201029232Y (en) * | 2006-12-30 | 2008-02-27 | 天津先唯铁路电子设备有限公司 | Fire-fighting broadcast controller |
| CN203608209U (en) * | 2013-11-28 | 2014-05-21 | 易程（苏州）智能系统有限公司 | Novel vehicle-mounted broadcast audio frequency switching system |
| CN104574826A (en) * | 2013-10-14 | 2015-04-29 | 西安山脉科技发展有限公司 | Communication early-warning machine |
| CN205336294U (en) * | 2015-12-31 | 2016-06-22 | 苏州华启智能科技有限公司 | Broadcasting system control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007115293A (en) * | 2005-10-17 | 2007-05-10 | Toshiba Corp | Information storage medium, program, information reproducing method, information reproducing apparatus, data transfer method, and data processing method |
-
2015
- 2015-12-31 CN CN201511012853.8A patent/CN105471536B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201029232Y (en) * | 2006-12-30 | 2008-02-27 | 天津先唯铁路电子设备有限公司 | Fire-fighting broadcast controller |
| CN104574826A (en) * | 2013-10-14 | 2015-04-29 | 西安山脉科技发展有限公司 | Communication early-warning machine |
| CN203608209U (en) * | 2013-11-28 | 2014-05-21 | 易程（苏州）智能系统有限公司 | Novel vehicle-mounted broadcast audio frequency switching system |
| CN205336294U (en) * | 2015-12-31 | 2016-06-22 | 苏州华启智能科技有限公司 | Broadcasting system control circuit |
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| Publication number | Publication date |
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| CN105471536A (en) | 2016-04-06 |
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