CN106375051A - Device for automatically switching analog audio and AES3 digital audio mixed signals - Google Patents
Device for automatically switching analog audio and AES3 digital audio mixed signals Download PDFInfo
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- CN106375051A CN106375051A CN201610860828.3A CN201610860828A CN106375051A CN 106375051 A CN106375051 A CN 106375051A CN 201610860828 A CN201610860828 A CN 201610860828A CN 106375051 A CN106375051 A CN 106375051A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
- H04H20/103—Transmitter-side switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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Abstract
The invention discloses a device for automatically switching analog audio and AES3 digital audio mixed signals, wherein both two reset terminals of a double-pole double-throw magnetic latching relay of a mixed signal input circuit are connected with an audio AD conversion chip; both two set terminals of the double-pole double-throw magnetic latching relay are connected with a digital audio receiving chip; the audio AD conversion chip and the digital audio receiving chip in the mixed signal input circuit are respectively connected with a complex programmable logic device U6 in a switching detection circuit; and the complex programmable logic device U6 in the switching detection circuit is respectively connected with an audio DA conversion chip U4 and a digital audio sending chip U5 in an output conversion circuit. According to the device disclosed by the invention, input selection of analog and digital signals is realized through the magnetic latching relay; an analog signal can be input; a digital signal also can be input; furthermore, after conversion, digital audio and analog audio signals can be respectively output; and thus, automatic analog and digital switchers can be replaced simultaneously.
Description
Technical field
The present invention relates to broadcasting communication technology field, more particularly, to a kind of analogue audio frequency and aes3 DAB mixed signal
Automatic switching control equipment.
Background technology
In order to ensure the safety in program signal source, one program of broadcast transmitting station has multipath signal source to ensure, such as
Optical fiber, satellite and microwave etc., several roads program source mutually backs up, right using audio frequency automatic switchover device (hereinafter referred to as automatic switchover device)
Programme signal source carries out selecting switching, delivers to broadcast transmitter and broadcasts.The each status input signal of automatic switchover device real-time monitoring, such as
The signal source that fruit is being broadcasted is interrupted or was lost efficacy, and automatic switchover device will go in auto switching to other effectively space signal sources,
Will not be interrupted with guarantee radio program transmission.
With the development of broadcast science and technology, programme signal source and broadcasting equipment also increasingly digitized, derived digital signal sum
Word equipment is all constantly increasing, the state form broadcast transmitting station analog systemss sum word coexistence of systems, being used in mixed way.China
Digital Audio Transmission interface standard be aes3 digital audio and video signals (hereinafter referred to as digital audio and video signals).
Because the physical parameter of analog- and digital- audio signal is entirely different, analog- and digital- equipment is incompatible, equally,
Automatic switchover device also only has single simulation and single numeral now, incompatible, thus uses to bring to user and asks
Topic.
For analog broadcasting transmitter, input signal must be simulation, so before automatic switchover device and signal source
It must be all simulation.For digital broadcast transmitter, input signal must be digital, equally, signal source above and from
Dynamic switch also must be digital.
But, in broadcast transmitting station, seldom have signal source and the state of equipment entirely analog or digital.Such as a set of
Program has 3 signal sources, and optical fiber, satellite and microwave are it is possible to optical fiber and satellite are digital signals, and microwave is analogue signal,
Or, signal source is entirely numeral, and transmitter is simulation.So analog or digital automatic switchover device can not be with signal source
Dock completely, only adopt ad (modulus) or signal is all converted to da (digital-to-analogue) transducer numeral or analogue signal could be right
Connect whole signal sources.
Equipment can be caused to roll up using analog and D/A converter, the equipment of increase not only takes up room, increase
Connection cable and junction point, more reduce the reliability of system.
Particularly problematic, if upgrading in the future, such as, original simulation signal generator upgrading derived digital signal,
Need to increase analog-digital converter.Or transmitter is by simulating upgrading numeral, need for simulation automatic switchover device to be replaced by numeral
Automatic switchover device.For good transmitter machine room of planning construction, change equipment is a trouble, leads one and moves
Whole body, especially increases equipment, connection cable also accordingly increases, and needs again to mate, and adjacent equipment needs to move, workload
Greatly.Broadcast broadcast time is long now, and the time of maintenance shut-downs is few, and Renewal process goes out a little unexpected, all possible impact broadcast program
Normal broadcast.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of analogue audio frequency and DAB mixing automatic switching control equipment.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is that analogue audio frequency and aes3 DAB mix
Close signal automatic switching control equipment, including mixed signal input circuit, change detection circuit, output conversion circuit；
Mixed signal input circuit includes DPDT magnetic latching relay, audio frequency ad conversion chip, DAB reception
Chip；2 reset terminals of DPDT magnetic latching relay are all connected with audio frequency ad conversion chip；DPDT magnetic keeps relay
2 set ends of device all receive chip with DAB and are connected；
Change detection circuit includes CPLD u6；Audio frequency ad conversion core in mixed signal input circuit
Piece, DAB are received chip and are connected with CPLD u6 in change detection circuit respectively；
Output conversion circuit includes audio frequency da conversion chip u4, DAB sends chip u5；In change detection circuit
CPLD u6 respectively with output conversion circuit in audio frequency da conversion chip u4, DAB send chip u5
Connect.
Preferably, mixed signal input circuit include the 1st mixed signal input circuit, the 2nd mixed signal input circuit,
3rd mixed signal input circuit；
1st mixed signal input circuit includes DPDT magnetic latching relay jc1, audio frequency ad conversion chip u11, numeral
Audio frequency receives chip u12；Reset terminal r11, r12 of DPDT magnetic latching relay jc1 and audio frequency ad conversion chip u11 are even
Connect；Set end s11, s12 of DPDT magnetic latching relay jc1 receives chip u12 with DAB and is connected；
2nd mixed signal input circuit includes DPDT magnetic latching relay jc2, audio frequency ad conversion chip u21, numeral
Audio frequency receives chip u22；Reset terminal r21, r22 of DPDT magnetic latching relay jc2 and audio frequency ad conversion chip u21 are even
Connect；Set end s21, s22 of DPDT magnetic latching relay jc2 receives chip u22 with DAB and is connected；
3rd mixed signal input circuit includes DPDT magnetic latching relay jc3, audio frequency ad conversion chip u31, numeral
Audio frequency receives chip u32；Reset terminal r31, r32 of DPDT magnetic latching relay jc3 and audio frequency ad conversion chip u31 are even
Connect；Set end s31, s32 of DPDT magnetic latching relay jc3 receives chip u32 with DAB and is connected.
Preferably, mixed signal input circuit adopts differential signal to input.
Preferably, also including direct connection after power failure circuit；Direct connection after power failure circuit include input socket cn1, accessory power outlet cn4,
Cn5, signal relay jx1, jx2, jx3 and DPDT magnetic latching relay jc4；
Input socket cn1 is connected with moving plate d1, d2 of signal relay jx1 respectively, the normally opened end of signal relay jx1
No1, no2 are connected with moving plate d1, d2 of DPDT magnetic latching relay jc4 respectively, and normal-closed end nc1, nc2 are double with double-pole respectively
Moving plate d1, d2 of throwing magnetic latching relay jc4 connect, reset terminal r41, r42 of DPDT magnetic latching relay jc4 respectively with
Normal-closed end nc1, nc2 of signal relay jx2 connect, set end s41, s42 of DPDT magnetic latching relay jc4 respectively with
Normal-closed end nc1, nc2 of signal relay jx3 connects, and moving plate d1, d2 of signal relay jx2 connect analogue audio frequency accessory power outlet
Moving plate d1, d2 of cn4, signal relay jx3 meets DAB accessory power outlet cn5.
Preferably, audio frequency ad conversion chip u11, u21, u31 and DAB receive chip u12, u22, u32, and
Audio frequency da conversion chip u4 sum word tone takes place frequently and send chip u5 all with i2S format signal is with CPLD u6 even
Connect.
Preferably, also including controlling and display circuit；Control and display circuit includes microprocessor u7, relay driving
Circuit, button and LCDs；CPLD in change detection circuit is connected with microprocessor u7, micro- place
Reason device u7 is connected with button and LCDs；Microprocessor u7 passes through relay drive circuit and keeps relay with DPDT magnetic
Device jc1, jc2, jc3 and jc4 connect.
The invention has the beneficial effects as follows:
Analog- and digital- automatic switchover device can be substituted completely, both can input analogue signal and can also input numeral letter
In addition number it is not necessary to increase ad and da transducer.Mixed signal automatic switchover device exports DAB and analogue audio frequency letter simultaneously
Number, if transmitter upgrades to numeral by simulation it is only necessary to the plug of original simulation output mouth is moved on to digital output.
Brief description
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is magnetic latching relay state conversion process schematic diagram.
Fig. 2 is analogue audio frequency of the present invention and the principle frame of aes3 DAB mixed signal automatic switching control equipment embodiment
Figure.
Specific embodiment
The problem existing for single type automatic switchover device, the present embodiment adopts magnetic latching relay, up-to-date audio frequency to compile
Decoding chip and cpld (complex programmable logic chip), have designed and developed a kind of analogue audio frequency and aes3 DAB mixing letter
Number automatic switching control equipment (hereinafter referred to as mixed signal automatic switchover device), solve foregoing analog- and digital- coexistence of systems,
It is used in mixed way the problem of presence.
1st, magnetic latching relay
Mixed signal input circuit and direct connection after power failure circuit all employ magnetic latching relay, are used for solving in power-off feelings
The constant problem of the signal type of input circuit and the selection of direct connection after power failure circuit under condition, first introduces magnetic here and keeps relay
Device.
Magnetic latching relay is a kind of new type of relay growing up in recent years, the same with other electromagnetic relays, right
Circuit plays turn on automatically and cutting action.Except that, the normally closed or normally open of magnetic latching relay is entirely dependence
The effect of permanent-magnet steel, the conversion of its on off state is to complete by the pulse electrical signal triggering of one fixed width.Magnetic keeps continuing
Magnetic force produced by permanent magnet is kept its contact opening and closing state of electrical equipment at ordinary times, and when contact is in hold mode, coil is not
Need to continue energising, only lean on the magnetic force of permanent magnet that the state of relay just can be maintained constant.
Fig. 1 demonstrates particular state transformation process, and j1 is resetting coil, and j2 is set coil.A: at magnetic latching relay
In reset state.B: coil j2 powers up pulse starts set, and c: arrived SM set mode, d: electric pulse disappears, and keeps set shape
State.In the same manner, if powering up pulse on coil j1, magnetic latching relay resets.
2nd, mixed signal automatic switchover device theory diagram
The principle of mixed signal automatic switchover device is as shown in Fig. 2 by the 1st, 2,3 mixed signal input circuits, change detection
Circuit, output conversion circuit, control display circuit and direct connection after power failure circuit composition.
3rd, mixed signal input circuit
1st, 2,3 mixed signal input circuits by a DPDT magnetic latching relay, audio frequency ad conversion chip and
DAB receives chip composition, and its function is to convert input signals into unified i2(the letter below of s format digital audio signal
Claim i2S signal) deliver to change detection circuit.
i2S signal is that PHILIPS Co. formulates, i for digital audio-frequency apparatus internal audio frequency data transfer2S signal packet contains 3
Data line, 1, serial data, the voice data being represented with the complement of two's two's complement；2nd, serial clock, is also bit clock, that is, correspond to number
Each data of word tone frequency has 1 pulse, the frequency=2 × sample frequency × sampling resolution of serial clock；3rd, frame clock,
For the data of switching right and left sound channel, " 0 " represents R channel, and " 1 " then represents L channel, and the frequency of frame clock is equal to sampling frequency
Rate.
Mixed signal input circuit is the key realizing analog- and digital- mixed signal input, the mixed signal of the present embodiment
Automatic switchover device comprise 3 the same the 1st, 2,3 mixed signal input circuits, with realize 3 tunnel mixed signal input signals from
Dynamic switching.
Input signal types are pressed user setup and are driven magnetic latching relay by user setup, mixed signal automatic switchover device
State.(the 1st mixed signal input circuit is provided with direct connection after power failure circuit, after introduce) taking the 2nd mixed signal input circuit as a example.
In professional equipment, no matter simulation or digital signal is all Balanced interface, differential transfer, need 1 positive 1 minus 2 holding wires, poor
The benefit of parallel circuit is the interference that can offset on transmission line, improves signal transmission quality.In the present embodiment, magnetic keeps relay
Device jc1-jc4 selects DPDT type, and just a pair of differential signal adopts a dpdt relay, facilitates circuit design.
Magnetic latching relay is resetted or set by the parameter of user setup in start or setting, and drive circuit exports
Current impulse, to reset or set coil, completes to reset or set action, after current impulse terminates, magnetic latching relay is still protected
Hold its state constant.In the present embodiment, for magnetic latching relay jc1-jc4, set when inputting simulated audio signal
For reset state, the then equipment SM set mode when input digital audio signal.And the 1st, 2,3 mixed signal input circuits are can
Be respectively provided with, for example, the 1st mixed signal input circuit is set to digital audio and video signals, and the 2nd mixed signal input circuit sets
It is set to simulated audio signal, the 3rd mixed signal input circuit is set to digital audio and video signals.Wherein the 1st mixed signal input electricity
Magnetic latching relay jc1 and jc4 on road is synchronization action, when the 1st mixed signal input circuit is set to simulated audio signal
When, jc1 and jc4 is synchronously set to reset state, and when being such as set to digital audio and video signals, jc1 and jc4 is synchronously set to SM set mode.
, the positive and negative two paths of signals of a pair of differential signal passes through the positive and negative of socket cn2 taking the 2nd mixed signal input circuit as a example
Two ends arrive first moving plate d1, d2 of magnetic latching relay jc2, if input setting selects simulated audio signal, jc2 is in reset shape
State, analogue signal is transferred to audio frequency ad conversion chip u21 from reset terminal r21, r22 of jc2, is converted to i2S format signal, delivers to
Change detection circuit u6 (cpld).
If input setting selects digital audio and video signals, jc2 is in SM set mode, and digital signal is from the set end of jc2
S21, s22 are transferred to DAB and receive chip u22, are converted to i2S signal, delivers to change detection circuit cpld.
In the present embodiment, audio frequency ad conversion chip u11, u21, u31 is all using the cs5361 of Cirrus Logic.Numeral
Audio frequency receives chip u12, u22, u32 all using the cs8416 of Cirrus Logic.
Complex programmable logic chip adopts the epm570 of altra company, and the model that audio frequency da conversion chip u4 adopts is
Cs4344, DAB sends the cs8406 that chip u5 adopts Cirrus Logic.
DAB receives chip u12, u22, u32 and also has signal error instruction function, if the DAB of input
Signal is wrong, such as diphase code mistake, pll (phaselocked loop) losing lock, crc verification mistake etc., the mistake instruction pin of chip
Level all can change, and these indication signals will be sent to microprocessor and be used for detecting the effectiveness of digital audio and video signals.
So whether analogue audio frequency or digital audio and video signals, are all converted to unified i2S signal, delivers to change detection
Circuit.
The present embodiment using the benefit that magnetic latching relay carries out signal switching is, even if losing power supply, input signal
Select also will not change, analogue signal is still added in analog circuit, digital signal and is still added in digital circuit, is not in mould
Plan signal is added in digital circuit and digital signal is added in the situation on analog circuit.Due to analog- and digital- audio signal physics
Parameter differs greatly, and simulated audio signal frequency is less than 20khz, and level magnitudes are at tens millivolts to more than ten volts, and aes3 number
Word audio signal frequency is 3.072mhz, level magnitudes about 2～7v, and interface impedance is also different, and DAB receives chip resistance
Resist for 110 ω, and analogue audio frequency is tens ω or 600 ω, if producing long-term unmatched connection to signal and circuit
Peace is all with hidden danger, so do input signal using magnetic latching relay selecting it becomes possible to avoid the generation of this hidden danger.
4th, direct connection after power failure circuit
Mixed signal automatic switchover device has a critically important function it is simply that direct connection after power failure, that is, when electrical power is off, inputs
Signal need not be through internal circuit, directly bypass output.Design direct connection after power failure purpose be, if mixed signal automatic switchover device
Circuit malfunctions, can close mixed signal automatic switchover device power supply, allow audio signal lead directly to output to transmitter it is ensured that wide
The broadcast broadcasting program will not be interrupted.
For mixed signal automatic switchover device, because it has analogue audio frequency and 2 output interfaces of DAB, when mixing letter
Must assure that analogue signal through to simulation output during the shutdown of number automatic switchover device, digital signal through to numeral output, this
Function is equally only just enabled using magnetic latching relay.
In fig. 2, direct connection after power failure circuit is made up of signal relay jx1, jx2, jx3 and magnetic latching relay jc4.This breaks
The operation principle of electric direct circuit is as follows:
1) adopt normal route by signal output when device power works, at this moment signal relay jx1, jx2, jx3 inhales
Close, moving plate end d is connected with normally opened end n0；Signal is inputted by socket cn1, keeps relay through d1, d2, n01, n02 of jx1 to magnetic
Device jc1, if selecting simulation input, jc1 is in reset terminal, and analogue signal is changed from d1, d2, r11, r12 of jc1 to audio frequency ad
Chip u11.If selection numeral input, jc1 is in set end, and digital signal is from d1, d2, s11, s12 of jc1 to DAB
Receiving chip u12, no matter selecting simulation or numeral input, being all converted to i2S signal is simultaneously input to cpld.Cpld is switching inspection
Slowdown monitoring circuit, the i of switching output2S signal is delivered to audio frequency da conversion chip u4 sum word tone and is taken place frequently the mould sending chip u5, u4 to change out
Intend audio frequency through jx2 no1, no2, d1, d2 from socket cn4 export, the aes3 DAB that u5 encodes out through jx3 no1,
No2, d1, d2 export from socket cn5.
2) when equipment shutdown power-off using power-off directapath by signal output, at this moment signal relay jx1, jx2,
Jx3 discharges, and moving plate d is connected with normal-closed end nc；Signal is inputted by socket cn1, is connected to magnetic through d1, d2, nc1, nc2 of jx1
Guard relay jc4.If select before power-off is simulation input, at this moment jc4 is in reset terminal, the d41 through jc4 for the signal,
Nc1, nc2, d1, d2 of d2, r41, r42 and jx2 exports from socket cn4, and output is analogue signal.If selected before power-off
It is numeral input, at this moment jc4 should be in set end, the d1 through jc4 for the signal coming from socket cn1 and signal relay jx1,
Nc1, nc2, d1, d2 of d2, s41, s42 and jx3 exports from socket cn5, and output is digital signal.In fig. 2, with dotted line table
Show the signal path of direct connection after power failure.As can be seen that no matter input is simulation or digital signal, after power-off, analogue signal is still
Can be from simulation output socket cn4 output, digital signal remains from numeral output socket cn5 output it is achieved that 1 tunnel input signal
The function of different outfans is arrived under direct connection after power failure state.
5th, change detection circuit
In the 1st, 2,3 mixed signal input circuits, 3 tunnel input signals are converted to i by unification2S digital audio and video signals send
To change detection circuit, change detection circuit selects 1 tunnel output, output format or i from 3 tunnel input signals2S, delivers to defeated
Go out change-over circuit.Decode i simultaneously2Voice data in s signal, the level for real-time monitoring 3 road input audio signal is big
Little.
Change detection circuit adopts cpld (CPLD), and cpld integrated level is high, logic scale is big, programming
Flexibly, scope of application width, strong security, user can voluntarily constitutive logic function as needed, in the present embodiment, a piece of
Cpld instead of tens 74 logical series chips, simplifies circuit design, improves product integrated level, convenient production, this
Cut the Performance And Reliability that all improve product.
6th, output conversion circuit
The i of change detection circuit output2S signal is delivered to audio frequency da conversion chip u4 sum word tone and is taken place frequently and send chip u5, sound
Frequency da conversion chip u4 is by i2S signal is converted to simulated audio signal output, and DAB sends chip u5 by i2S signal is again
It is encoded into the output of aes3 digital audio and video signals.User can as needed, if analog broadcasting transmitter then connects analogue audio frequency
Signal output part, if digital broadcast transmitter then connects digital audio signal output.
7th, control and display circuit
Control and display circuit is made up of microprocessor u7, relay drive circuit, key switch and LCDs.Continue
Electrical apparatus driving circuit is used for controlling setting and the reset state of all magnetic latching relay jc1-jc4.Key switch receive user
Control instruction, the level of LCDs Real time dynamic display input signal and the operational factor of equipment, see for user and look into,
Grasp equipment running status in real time.
Microprocessor u7 is the brain of mixed signal automatic switchover device, and there are control and detection program in inside, to input signal
Carry out detection to judge, control the switching of switch.
8th, the setting of signal and detection
For digital signal, DAB receives chip has signal error to indicate, can judge signal according to indication signal
Whether effective.But the special circumstances for digital signal, for example, digital transmission link interrupts, but digital receiver also can export
Normal mute signal, this situation DAB receives chip detection not out, same when analogue signal is quiet, also will pass through
Detection signal level size and go signal duration judge.
The principal set up item of mixed signal automatic switchover device have detection pattern, detection level, detection time, time of return,
Input signal types, the coming into operation or disable of input, the man machine interface that user passes through key switch and LCDs form is carried out
Setting, selects suitable detection parameter.Specific as follows:
1) detection pattern is set
Mixed signal automatic switchover device could be arranged to stereo, L channel or 3 kinds of patterns of R channel, 3 kinds of Setting patterns
All can show in liquid crystal display screen, when inputting monophonic signal, need to be set to L channel or R channel pattern, it is to avoid another sound channel
No signal and the automatic switchover of generation and report to the police impact.
2) setting detection level, detection time, recovery time
In actual use it is possible to because transmission link or equipment fault cause audio signal to lose or signal amplitude mistake
Little, do not reach normal broadcast and require, be not normal mute state.Therefore user can arrange one according to the practical situation of oneself
Individual detection level, when audio level is less than setting level limit and reaches detection time, that is, judges invalidating signal it is necessary to be switched to
Space signal is normally broadcasted with ensureing broadcast program.It is allowed to standby road signal returns after master source is recovered, but master during firm recovery
Signal is not necessarily stable, so it is not recommended that returning immediately, but monitoring a period of time (i.e. recovery time), confirmation signal is stable
Afterwards, space signal just returns, it is to avoid that causes because main signal is unstable bad broadcasts or broadcast accident.
3) input signal types are set
Arranged by input through keyboard type, and show that " digital " expression input is digital signal on a display screen, show
Illustrate that " simulation " represents that input is analogue signal.
4) setting input channel comes into operation, disables
Mixed signal automatic switchover device is provided with 3 tunnel inputs, when only 1 tunnel or 2 tunnel input signal, because being to automatically switch
Device, does not have the passage of input signal can produce warning, for avoiding this situation, needs to be set to stop by no input channel
With stopping the detection to this passage, it is to avoid false alarm.
Mixed signal automatic switchover device machine designed by the present embodiment, analog and digital signal can connect it is not necessary to ad
With da transducer, change signal and only need to change setting, easy to use.
Liquid crystal display screen and display lamp allow user's energy Real Time Observation to signal level size and state parameter, grasp current demand signal fortune
Row state, once problematic generation, also can easy-to-look-up questions and prospect.
, through the actual motion of several months, mixed signal automatic switchover device stable performance, detection is accurate, for letter for the present embodiment
The interruption in number source and lost efficacy and can find in time, automatically arrives and changes space signal it is ensured that the normal broadcast of broadcast program, be to broadcast
The powerful guarantee that pad safety broadcasts.
The present embodiment can substitute analog- and digital- automatic switchover device completely, and both can input analogue signal can also input
In addition digital signal it is not necessary to increase ad and da transducer.Mixed signal automatic switchover device exports DAB and simulation simultaneously
Audio signal, if transmitter upgrades to numeral by simulation, only need to the plug original simulation output mouth move on to numeral defeated
Export.
Invention described above embodiment, does not constitute limiting the scope of the present invention.Any in the present invention
Spirit and principle within modification, equivalent and improvement of being made etc., should be included in the claim protection model of the present invention
Within enclosing.
Claims (6)
1. analogue audio frequency and aes3 DAB mixed signal automatic switching control equipment it is characterised in that: include mixed signal input
Circuit, change detection circuit, output conversion circuit；
Described mixed signal input circuit includes DPDT magnetic latching relay, audio frequency ad conversion chip, DAB reception
Chip；2 reset terminals of described DPDT magnetic latching relay are all connected with audio frequency ad conversion chip；Described DPDT magnetic
2 set ends of guard relay all receive chip with DAB and are connected；
Described change detection circuit includes CPLD u6；Audio frequency ad in described mixed signal input circuit turns
Change chip, DAB is received chip and is connected with CPLD u6 in change detection circuit respectively；
Described output conversion circuit includes audio frequency da conversion chip u4, DAB sends chip u5；Described change detection circuit
In CPLD u6 respectively with output conversion circuit in audio frequency da conversion chip u4, DAB send core
Piece u5 connects.
2. analogue audio frequency according to claim 1 and aes3 DAB mixed signal automatic switching control equipment, its feature exists
In: described mixed signal input circuit includes the 1st mixed signal input circuit, the 2nd mixed signal input circuit, the 3rd mixing letter
Number input circuit；
Described 1st mixed signal input circuit includes DPDT magnetic latching relay jc1, audio frequency ad conversion chip u11, numeral
Audio frequency receives chip u12；Reset terminal r11, r12 of described DPDT magnetic latching relay jc1 and audio frequency ad conversion chip u11
Connect；Set end s11, s12 of described DPDT magnetic latching relay jc1 receives chip u12 with DAB and is connected；
Described 2nd mixed signal input circuit includes DPDT magnetic latching relay jc2, audio frequency ad conversion chip u21, numeral
Audio frequency receives chip u22；Reset terminal r21, r22 of described DPDT magnetic latching relay jc2 and audio frequency ad conversion chip u21
Connect；Set end s21, s22 of described DPDT magnetic latching relay jc2 receives chip u22 with DAB and is connected；
Described 3rd mixed signal input circuit includes DPDT magnetic latching relay jc3, audio frequency ad conversion chip u31, numeral
Audio frequency receives chip u32；Reset terminal r31, r32 of described DPDT magnetic latching relay jc3 and audio frequency ad conversion chip u31
Connect；Set end s31, s32 of described DPDT magnetic latching relay jc3 receives chip u32 with DAB and is connected.
3. analogue audio frequency according to claim 1 and 2 and aes3 DAB mixed signal automatic switching control equipment, its feature
It is: described mixed signal input circuit adopts differential signal to input.
4. analogue audio frequency according to claim 2 and aes3 DAB mixed signal automatic switching control equipment, its feature exists
In: also include direct connection after power failure circuit；Described direct connection after power failure circuit includes input socket cn1, accessory power outlet cn4, cn5, signal continue
Electrical equipment jx1, jx2, jx3 and DPDT magnetic latching relay jc4；
Described input socket cn1 is connected with moving plate d1, d2 of signal relay jx1 respectively, the normally opened end of signal relay jx1
No1, n02 are connected with moving plate d1, d2 of DPDT magnetic latching relay jc4 respectively, and normal-closed end nc1, nc2 are double with double-pole respectively
Moving plate d1, d2 of throwing magnetic latching relay jc4 connect, reset terminal r41, r42 of DPDT magnetic latching relay jc4 respectively with
Normal-closed end nc1, nc2 of signal relay jx2 connect, set end s41, s42 of DPDT magnetic latching relay jc4 respectively with
Normal-closed end nc1, nc2 of signal relay jx3 connects, and moving plate d1, d2 of signal relay jx2 connect analogue audio frequency accessory power outlet
Moving plate d1, d2 of cn4, signal relay jx3 meets DAB accessory power outlet cn5.
5. analogue audio frequency according to claim 2 and aes3 DAB mixed signal automatic switching control equipment, its feature exists
In: described audio frequency ad conversion chip u11, u21, u31 and DAB receive chip u12, u22, u32, and audio frequency da conversion
Chip u4 sum word tone takes place frequently and send chip u5 all with i2S format signal is connected with CPLD u6.
6. analogue audio frequency according to claim 1 and 2 and aes3 DAB mixed signal automatic switching control equipment, its feature
Be: also include controlling and display circuit, described control and display circuit include microprocessor u7, relay drive circuit, by
Key and LCDs；CPLD in described change detection circuit is connected with microprocessor u7, described micro-
Processor u7 is connected with button and LCDs；Described microprocessor u7 passes through relay drive circuit to be protected with DPDT magnetic
Hold relay jc1, jc2, jc3 and jc4 to connect.
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| CN110231786A (en) * | 2019-05-16 | 2019-09-13 | 杭州众传数字设备有限公司 | A kind of MCVF multichannel voice frequency switch |
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| CN106375051B (en) | 2018-09-18 |
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