CN106375051B - Analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipments - Google Patents
Analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipments Download PDFInfo
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- CN106375051B CN106375051B CN201610860828.3A CN201610860828A CN106375051B CN 106375051 B CN106375051 B CN 106375051B CN 201610860828 A CN201610860828 A CN 201610860828A CN 106375051 B CN106375051 B CN 106375051B
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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
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Abstract
The invention discloses 2 reset terminals of a kind of analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipments, wherein the double-pole double throw magnetic latching relay of mixed signal input circuit to be connect with audio AD conversion chip；2 set ends of double-pole double throw magnetic latching relay receive chip with digital audio and connect；Audio AD conversion chip, digital audio in mixed signal input circuit receive chip and are connect respectively with the Complex Programmable Logic Devices U6 in change detection circuit；Complex Programmable Logic Devices U6 in change detection circuit is connect with audio DA conversion chips U4, the digital audio transmission chip U5 in output conversion circuit respectively.The present invention realizes the input selection of analog and digital signal using magnetic latching relay, analog signal, which can be inputted, can also input digital signal, and digital audio and analog audio signal are exported after converted respectively, analog- and digital- automatic switchover device can be substituted simultaneously.
Description
Technical field
The present invention relates to broadcasting communication technology field more particularly to a kind of analogue audio frequencies and AES3 digital audio mixed signals
Automatic switching control equipment.
Background technology
In order to ensure that the safety in program signal source, one program of broadcast transmitting station have multipath signal source to ensure, such as
Optical fiber, satellite and microwave etc., a few road program sources mutually back up, right using audio automatic switchover device (hereinafter referred to as automatic switchover device)
Programme signal source carries out selection switching, is sent to broadcast transmitter broadcast.Automatic switchover device monitors each status input signal in real time, such as
The signal source that fruit is being broadcasted is interrupted or failure, automatic switchover device will be gone in auto switching to other effective space signal sources,
To ensure that radio program transmission will not be interrupted.
With the development of broadcast science and technology, programme signal source and broadcasting equipment also increasingly digitize, derived digital signal sum number
Word equipment is all constantly increasing, formed broadcast transmitting station simulation system sum number word coexistence of systems, the state that is 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).
Since the physical parameter of analog- and digital- audio signal is entirely different, analog- and digital- equipment is incompatible, equally,
Present automatic switchover device also only has single simulation and single number, incompatible, thus brings and asks to user's use
Topic.
For analog broadcasting transmitter, input signal must be simulation, in this way the automatic switchover device and signal source of front
It all must be simulation.For digital broadcast transmitter, input signal must be it is digital, equally, the signal source of front and from
Dynamic switch also must be digital.
But in broadcast transmitting station, few signal sources and equipment are entirely the state of analog or digital.Such as it is a set of
Program has 3 signal sources, optical fiber, satellite and microwave, it is possible to and optical fiber and satellite are digital signals, and microwave is analog signal,
Alternatively, signal source is entirely number, and transmitter is simulation.Analog or digital automatic switchover device cannot be with signal source in this way
Docking completely, only using AD (modulus) or DA (digital-to-analogue) converters that signal is all converted to digital or analog signal could be right
Connect whole signal sources.
Equipment can be caused to increase significantly using analog/digital and D/A converter, increased equipment not only occupied space increases
Connecting cable and tie point more reduce the reliability of system.
It is particularly problematic, if upgrading in the future, for example, original simulation signal generator upgrades derived digital signal,
It needs to increase analog-digital converter.Or transmitter, by simulation upgrading number, automatic switchover device will be simulated by, which needing, is changed to number
Automatic switchover device.For good transmitter computer room of planning construction, change equipment is a trouble, leads a hair and moves
Whole body especially increases equipment, and connecting cable also accordingly increases, and needs to match again, and adjacent equipment needs move, workload
Greatly.Broadcast broadcast time is long now, and the time of maintenance shut-downs is few, and replacement process goes out a little surprisingly, may all influence broadcast program
Normal broadcast.
Invention content
The technical problem to be solved in the present invention is to provide a kind of analogue audio frequencies and digital audio to mix automatic switching control equipment.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that analogue audio frequency and AES3 digital audio are mixed
Signal automatic switching control equipment is closed, including at least mixed signal input circuit and change detection circuit and output conversion are electric all the way
Road；
Mixed signal input circuit includes double-pole double throw magnetic latching relay, audio AD conversion chip, digital audio all the way
Receive chip；2 reset terminals of double-pole double throw magnetic latching relay are connect with audio AD conversion chip；Double-pole double throw magnetic is kept
2 set ends of relay receive chip with digital audio and connect；
Change detection circuit includes Complex Programmable Logic Devices U6；Audio AD conversion core in mixed signal input circuit
Piece, digital audio receive chip and are connect respectively with the Complex Programmable Logic Devices U6 in change detection circuit；
Output conversion circuit includes audio DA conversion chips U4, digital audio transmission chip U5；In change detection circuit
Complex Programmable Logic Devices U6 respectively with audio DA conversion chips U4, the digital audio transmission chip U5 in output conversion circuit
Connection.
Preferably, mixed signal input circuit includes three tunnel mixed signal input circuits, i.e. the 1st mixed signal input electricity
Road, the 2nd mixed signal input circuit, the 3rd mixed signal input circuit；
1st mixed signal input circuit includes double-pole double throw magnetic latching relay JC1, audio AD conversion chip U11, number
Audio receives chip U12；Reset terminal R11, R12 and audio AD conversion chip U11 of double-pole double throw magnetic latching relay JC1 connects
It connects；Set end S11, S12 and digital audio of double-pole double throw magnetic latching relay JC1 receives chip U12 connections；
2nd mixed signal input circuit includes double-pole double throw magnetic latching relay JC2, audio AD conversion chip U21, number
Audio receives chip U22；Reset terminal R21, R22 and audio AD conversion chip U21 of double-pole double throw magnetic latching relay JC2 connects
It connects；Set end S21, S22 and digital audio of double-pole double throw magnetic latching relay JC2 receives chip U22 connections；
3rd mixed signal input circuit includes double-pole double throw magnetic latching relay JC3, audio AD conversion chip U31, number
Audio receives chip U32；Reset terminal R31, R32 and audio AD conversion chip U31 of double-pole double throw magnetic latching relay JC3 connects
It connects；Set end S31, S32 and digital audio of double-pole double throw magnetic latching relay JC3 receives chip U32 connections.
Preferably, mixed signal input circuit is inputted using differential signal.
Preferably, further 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 double-pole double throw magnetic latching relay JC4；
Input socket CN1 is connect with movable plate D1, D2 of signal relay JX1 respectively, the normally open end of signal relay JX1
N01, N02 are connect with movable plate D1, D2 of double-pole double throw magnetic latching relay JC4 respectively, and normal-closed end NC1, NC2 are double with double-pole respectively
Throw movable plate D1, D2 connection of magnetic latching relay JC4, reset terminal R41, R42 of double-pole double throw magnetic latching relay JC4 respectively with
Normal-closed end NC1, NC2 connection of signal relay JX2, set end S41, S42 of double-pole double throw magnetic latching relay JC4 respectively with
Normal-closed end NC1, NC2 connection of signal relay JX3, movable plate D1, D2 of signal relay JX2 connect analogue audio frequency accessory power outlet
Movable plate D1, D2 of CN4, signal relay JX3 meet digital audio accessory power outlet CN5.
Preferably, audio AD conversion chip U11, U21, U31 and digital audio receive chip U12, U22, U32, and
U5 is with I for audio DA conversion chip U4 sum number word tone frequency transmission chips2S format signals connect with Complex Programmable Logic Devices U6
It connects.
Preferably, further including control and display circuit；Control and display circuit include microprocessor U7, relay driving
Circuit, button and liquid crystal display；Complex Programmable Logic Devices in change detection circuit is connect with microprocessor U7, micro- place
Reason device U7 is connect with button and liquid crystal display；Microprocessor U7 keeps relay by relay drive circuit and double-pole double throw magnetic
Device JC1, JC2, JC3 are connected with JC4.
The beneficial effects of the invention are as follows：
Analog- and digital- automatic switchover device can be substituted completely, can input analog signal or input digital letter
Number, it need not in addition increase A/D and D/A converter.Mixed signal automatic switchover device exports digital audio and analogue audio frequency letter simultaneously
Number, if transmitter upgrades to number by simulating, it is only necessary to which the plug of original simulation output mouth is moved on to digital output.
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is magnetic latching relay state conversion process schematic diagram.
Fig. 2 is the principle frame of analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipment embodiment of the present invention
Figure.
Specific implementation mode
For single type automatic switchover device there are the problem of, the present embodiment using magnetic latching relay, newest audio compile
Decoding chip and CPLD (complex programmable logic chip) have designed and developed a kind of analogue audio frequency and AES3 digital audio mixing letter
Number automatic switching control equipment (hereinafter referred to as mixed signal automatic switchover device), solve foregoing analog- and digital- coexistence of systems,
Be used in mixed way there are the problem of.
1, magnetic latching relay
Mixed signal input circuit and direct connection after power failure circuit all use magnetic latching relay, for solving in power-off feelings
The constant problem of signal type of input circuit and the selection of direct connection after power failure circuit under condition, first introduces magnetic and keeps relay here
Device.
Magnetic latching relay has been developed in recent years a kind of new type of relay as other electromagnetic relays, right
Circuit plays turn on automatically and cutting action.The difference is that the normally closed or normally open of magnetic latching relay is entirely to rely on
The effect of permanent-magnet steel, the conversion of on off state are completed by the pulse electrical signal triggering of one fixed width.Magnetic keep after
Usually the magnetic force caused by permanent magnet is kept for electric appliance its contact opening and closing state, and when contact is in hold mode, coil is not
It needs to continue to be powered, only leans on the magnetic force of permanent magnet that the state of relay can be maintained constant.
Fig. 1 demonstrates particular state transfer process, and J1 is resetting coil, and J2 is set coil.A：At magnetic latching relay
In reset state.B：Coil J2 power-up pulses start set, C：SM set mode, D are arrived：Electric pulse disappears, and keeps set shape
State.Similarly, if powering up pulse on coil J1, magnetic latching relay resets.
2, mixed signal automatic switchover device functional block diagram
The principle of mixed signal automatic switchover device is as shown in Fig. 2, (the i.e. the 1st, 2,3 is mixed by three tunnel mixed signal input circuits
Close signal input circuit) and change detection circuit, output conversion circuit, control display circuit and direct connection after power failure circuit composition.
3, mixed signal input circuit
1st, 2,3 mixed signal input circuits by a double-pole double throw magnetic latching relay, audio AD conversion chip and
Digital audio receives chip composition, and function is to convert input signals into unified I2(the following letter of S format digital audios signal
Claim I2S signals) it is sent to change detection circuit.
I2S signals are that PHILIPS Co. formulates for digital audio-frequency apparatus internal audio frequency data transmission, I2S signals include 3
Data line, 1, serial data, the audio data indicated with the complement of two's two's complement；2, serial clock is also bit clock, that is, corresponds to number
Each data of word tone frequency have 1 pulse, frequency=2 × sample frequency × sampling resolution of serial clock；3, frame clock,
For the data of switching right and left sound channel, " 0 " indicates that right channel, " 1 " then indicate that L channel, the frequency of frame clock are equal to sampling frequency
Rate.
Mixed signal input circuit is the key that realize analog- and digital- mixed signal input, the mixed signal of the present embodiment
Automatic switchover device include 3 the same 1st, 2,3 mixed signal input circuits, with realize 3 tunnel mixed signal input signals from
Dynamic switching.
Input signal types are by user setting, and mixed signal automatic switchover device is by user setting driving magnetic latching relay
State.By taking the 2nd mixed signal input circuit as an example (the 1st mixed signal input circuit be equipped with direct connection after power failure circuit, behind introduce).
In professional equipment, no matter simulation or digital signal are all Balanced interface, differential transfer, 1 positive 1 minus 2 signal wires are needed, it is poor
The benefit of parallel circuit is the interference that can be offset on transmission line, improves signal transmission quality.In the present embodiment, magnetic keeps relay
Device JC1-JC4 selects double-pole double throw type, and just a pair of of differential signal uses a dpdt relay, facilitates circuit design.
Magnetic latching relay by the parameter of user setting reset in booting or setting or set, driving circuit export
Current impulse is completed to reset or set acts, after current impulse, magnetic latching relay is still protected to reset or set coil
It is constant to hold its state.In the present embodiment, it for magnetic latching relay JC1-JC4, is set when inputting analog audio signal
For reset state, the then equipment SM set mode when input digital audio signal.And the 1st, 2,3 mixed signal input circuit be can
With what is be respectively set, for example, the 1st mixed signal input circuit is set as digital audio and video signals, the 2nd mixed signal input circuit is set
It is set to analog audio signal, the 3rd mixed signal input circuit is set as digital audio and video signals.Wherein the 1st mixed signal input electricity
The magnetic latching relay JC1 and JC4 on road are synchronization actions, when the 1st mixed signal input circuit is set as analog audio signal
When, JC1 and JC4 synchronize be set as reset state, when being such as set as digital audio and video signals, JC1 and JC4 synchronize be set as SM set mode.
By taking the 2nd mixed signal input circuit as an example, the positive and negative two paths of signals of a pair of of differential signal passes through the positive and negative of socket CN2
Both ends arrive first movable plate D1, D2 of magnetic latching relay JC2, if input setting selection analog audio signal, JC2, which is in, resets shape
State, analog signal are transferred to audio AD conversion chip U21 from reset terminal R21, R22 of JC2, are converted to I2S format signals, are sent to
Change detection circuit U 6 (CPLD).
If input setting selection digital audio and video signals, JC2 are in SM set mode, set end of the digital signal from JC2
S21, S22 are transferred to digital audio and receive chip U22, are converted to I2S signals are sent to change detection circuit CPLD.
In the present embodiment, audio AD conversion chip U11, U21, U31 are all made of the CS5361 of Cirrus Logic.Number
Audio receives the CS8416 that chip U12, U22, U32 are all made of Cirrus Logic.
Complex programmable logic chip uses the EPM570 of ALTRA companies, the model that audio DA conversion chips U4 is used to be
CS4344, digital audio transmission chip U5 use the CS8406 of Cirrus Logic.
Digital audio, which receives chip U12, U22, U32, also has the function of signal error instruction, if the digital audio of input
Signal is wrong, such as diphase code mistake, PLL (phaselocked loop) losing lock, CRC check mistake etc., the error indication pin of chip
Level can all change, these indication signals will be sent to validity of the microprocessor for detecting digital audio and video signals.
Whether analogue audio frequency or digital audio and video signals in this way, are all converted to unified I2S signals, are sent to change detection
Circuit.
The benefit that the present embodiment carries out signal switching using magnetic latching relay is, even if losing power supply, input signal
Selection will not change, and analog signal is still added in analog circuit, digital signal is still added in digital circuit, is not in mould
Quasi- 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 analog audio signal frequency is no more than 20kHz, and level magnitudes are at tens millivolts to more than ten volts, and AES3 numbers
Word audio signal frequency is 3.072MHz, and level magnitudes about 2~7V, interface impedance is also different, and digital audio receives chip resistance
Resist for 110 Ω, and analogue audio frequency is tens Ω or 600 Ω, if generating long-term unmatched connection to signal and circuit
Peace is all with hidden danger, so doing input signal selection using magnetic latching relay, it will be able to avoid the generation of this hidden danger.
4, direct connection after power failure circuit
Mixed signal automatic switchover device has a critically important function, is exactly direct connection after power failure, i.e., when electrical power is off, input
Signal is without internal circuit, directly bypass output.The purpose of design direct connection after power failure is, if mixed signal automatic switchover device
Circuit malfunctions can close mixed signal automatic switchover device power supply, allow audio signal is straight-through to be output to transmitter, ensure wide
Broadcasting the broadcast of program will not interrupt.
For mixed signal automatic switchover device, because it has 2 output interfaces of analogue audio frequency and digital audio, when mixing is believed
Analog signal be must assure that when the shutdown of number automatic switchover device through to simulation output, digital signal through to numeral output, this
Function equally could only be realized using magnetic latching relay.
In fig. 2, direct connection after power failure circuit is made of signal relay JX1, JX2, JX3 and magnetic latching relay JC4.This is disconnected
The operation principle of electric direct circuit is as follows：
1) signal is exported using normal route when device power works, at this moment signal relay JX1, JX2, JX3 inhales
It closes, movable plate end D is connect with normally open end N0；Signal is inputted by socket CN1, and relay is kept to magnetic by D1, D2, N01, N02 of JX1
Device JC1, if selection simulation input, JC1 are in reset terminal, analog signal is from D1, D2, R11, R12 of JC1 to audio AD conversion
Chip U11.If numeral input, JC1 is selected to be in set end, digital signal is from D1, D2, S11, S12 of JC1 to digital audio
Chip U12 is received, no matter selection simulation or numeral input, are all converted to I2S signals are simultaneously input to CPLD.CPLD is switching inspection
Slowdown monitoring circuit switches the I of output2S signals are sent to audio DA conversion chip U4 sum number word tone frequency transmission chip U5, the mould that U4 is converted out
Quasi- audio is exported by N01, N02, D1, D2 of JX2 from socket CN4, the AES3 digital audio that U5 is encoded out by JX3 N01,
N02, D1, D2 are exported from socket CN5.
2) when equipment shut down power off when using power-off directapath signal is exported, at this moment signal relay JX1, JX2,
JX3 discharges, and movable plate D is connect with normal-closed end NC；Signal is inputted by socket CN1, and magnetic is connected to by D1, D2, NC1, NC2 of JX1
Guard relay JC4.If what is selected before power-off is simulation input, at this moment JC4 is in reset terminal, D41 of the signal through JC4,
NC1, NC2, D1, D2 of D2, R41, R42 and JX2 are exported from socket CN4, and output is analog signal.If selected before power-off
It is numeral input, at this moment JC4 should be in set end, D1 of the signal to come from socket CN1 and signal relay JX1 through JC4,
NC1, NC2, D1, D2 of D2, S41, S42 and JX3 are exported 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 is no matter inputted is simulation or digital signal, after power-off, analog signal is still
It can be exported from simulation output socket CN4, digital signal is still to be exported from numeral output socket CN5, realizes 1 tunnel input signal
The function of different output ends is arrived under direct connection after power failure state.
5, change detection circuit
In the 1st, 2,3 mixed signal input circuits, 3 tunnel input signals are uniformly converted to I2S digital audio and video signals are sent
To change detection circuit, change detection circuit selects 1 tunnel to export from 3 tunnel input signals, output format or I2S is sent to defeated
Go out conversion circuit.Decode I simultaneously2Audio data in S signals, the level for monitoring 3 road input audio signals in real time are big
It is small.
Change detection circuit uses CPLD (Complex Programmable Logic Devices), and CPLD integrated levels are high, logic scale is big, programming
Flexibly, the scope of application is wide, strong security, user can voluntarily constitutive logic function as needed, it is in the present embodiment, a piece of
CPLD simplifies circuit design instead of tens 74 logical series chips, improves product integrated level, facilitates production, this
Cut the Performance And Reliability for all improving product.
6, output conversion circuit
The I of change detection circuit output2S signals are sent to audio DA conversion chip U4 sum number word tone frequency transmission chip U5, sound
Frequency DA conversion chips U4 is by I2S signals are converted to analog audio signal output, and digital audio transmission chip U5 is by I2S signals are again
It is encoded into the output of AES3 digital audio and video signals.User can be as needed, and analogue audio frequency is then connect if it is analog broadcasting transmitter
Signal output end then connects digital audio signal output if it is digital broadcast transmitter.
7, control and display circuit
Control and display circuit are made of microprocessor U7, relay drive circuit, key switch and liquid crystal display.After
Electrical apparatus driving circuit is used to control setting and the reset state of all magnetic latching relay JC1-JC4.Key switch receives user
Control instruction, the operating parameter of the level and equipment of liquid crystal display Real time dynamic display input signal are seen for user and are looked into,
Equipment running status is grasped 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
It is detected judgement, controls the switching of switch.
8, the setting and detection of signal
For digital signal, digital audio, which receives chip, signal error instruction, can judge signal according to indication signal
Whether effectively.But for the special circumstances of digital signal, for example, digital transmission link interrupts, but digital receiver can also export
Normal mute signal, such case digital audio receives chip and can not be detected, same when analog signal is mute, also to pass through
Detection signal level size and signal duration go to judge.
The main setting option of mixed signal automatic switchover device have detection pattern, detection level, detection time, time of return,
Input signal types, input come into operation or deactivate, user pass through key switch and liquid crystal display composition man-machine interface carry out
Setting, selects suitable detection parameters.It is specific as follows：
1) detection pattern is set
Mixed signal automatic switchover device could be provided as 3 kinds of patterns of stereo, L channel or right channel, 3 kinds of Setting patterns
It can be shown in liquid crystal display, when inputting monophonic signal, need to be set as L channel or right channel pattern, avoid another sound channel
No signal and generation automatic switchover and alarm influence.
2) setting detection level, detection time, recovery time
In actual use, it is possible to because transmission link or equipment fault cause audio signal loss or signal amplitude mistake
It is small, normal broadcast is not achieved and requires, is not normal mute state.Therefore user can be arranged one according to the actual conditions of oneself
A detection level judges invalidating signal, it is necessary to be switched to when audio level, which is less than setting level limit, reaches detection time
Space signal is to ensure that broadcast program normally broadcasts.After master source is restored, master when allowing standby road signal to return, but just restoring
Signal is not necessarily stablized, thus it is not recommended that return immediately, but a period of time (i.e. recovery time) is monitored, confirmation signal stabilization
Afterwards, space signal just returns, and avoids bad caused by main signal is unstable broadcasting or broadcast accident.
3) input signal types are set
It is arranged by keyboard input type, and shows that " number " indicates that input is digital signal on a display screen, is shown
Show that it is analog signal " to simulate " expression input.
4) setting input channel comes into operation, deactivates
Mixed signal automatic switchover device is inputted equipped with 3 tunnels, when only 1 tunnel or 2 tunnel input signal, because being to automatically switch
Device, not the channel of input signal will produce alarm, to avoid such case, need to be set as stopping by no input channel
With detection of the stopping to the channel avoids false alarm.
Mixed signal automatic switchover device machine designed by the present embodiment, analog and digital signal can connect, and not need AD
And D/A converter, setting need to only be changed by replacing signal, easy to use.
Liquid crystal display and indicator light allow user that can observe signal level size and state parameter in real time, grasp current demand signal fortune
Row state, once problematic generation, it also can easy-to-look-up questions and prospect.
The present embodiment passes through the actual motion of several months, and mixed signal automatic switchover device performance is stablized, and detection is accurate, for letter
The interruption and failure in number source can be found in time, automatically to space signal is changed, ensure 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, can input analog signal or input
In addition digital signal need not increase A/D and D/A converter.Mixed signal automatic switchover device exports digital audio and simulation simultaneously
Audio signal only needs the plug original simulation output mouth to move on to number defeated if transmitter upgrades to number by simulating
Outlet.
The embodiments of the present invention described above are not intended to limit the scope of the present invention.It is any in the present invention
Spirit and principle within made by modifications, equivalent substitutions and improvements etc., should be included in the claim protection model of the present invention
Within enclosing.
Claims (6)
1. analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipments, it is characterised in that：Including at least mixing all the way
Signal input circuit and change detection circuit and output conversion circuit；
The input circuit of mixed signal all the way includes double-pole double throw magnetic latching relay, audio AD conversion chip, digital audio
Receive chip；2 reset terminals of the double-pole double throw magnetic latching relay are connect with audio AD conversion chip；The double-pole is double
2 set ends for throwing magnetic latching relay are connect with digital audio reception chip；
The change detection circuit includes Complex Programmable Logic Devices U6；Audio in the input circuit of mixed signal all the way
AD conversion chip, digital audio receive chip and are connect respectively with the Complex Programmable Logic Devices U6 in change detection circuit；
The output conversion circuit includes audio DA conversion chips U4, digital audio transmission chip U5；The change detection circuit
In Complex Programmable Logic Devices U6 respectively in output conversion circuit audio DA conversion chips U4, digital audio send core
Piece U5 connections.
2. analogue audio frequency according to claim 1 and AES3 digital audio mixed signal automatic switching control equipments, feature exist
In：The mixed signal input circuit includes three tunnel mixed signal input circuits, i.e. the 1st mixed signal input circuit, the 2nd mixing
Signal input circuit, the 3rd mixed signal input circuit；
The 1st mixed signal input circuit includes double-pole double throw magnetic latching relay JC1, audio AD conversion chip U11, number
Audio receives chip U12；Reset terminal R11, R12 and audio AD conversion chip U11 of the double-pole double throw magnetic latching relay JC1
Connection；Set end S11, S12 and digital audio of the double-pole double throw magnetic latching relay JC1 receives chip U12 connections；
The 2nd mixed signal input circuit includes double-pole double throw magnetic latching relay JC2, audio AD conversion chip U21, number
Audio receives chip U22；Reset terminal R21, R22 and audio AD conversion chip U21 of the double-pole double throw magnetic latching relay JC2
Connection；Set end S21, S22 and digital audio of the double-pole double throw magnetic latching relay JC2 receives chip U22 connections；
The 3rd mixed signal input circuit includes double-pole double throw magnetic latching relay JC3, audio AD conversion chip U31, number
Audio receives chip U32；Reset terminal R31, R32 and audio AD conversion chip U31 of the double-pole double throw magnetic latching relay JC3
Connection；Set end S31, S32 and digital audio of the double-pole double throw magnetic latching relay JC3 receives chip U32 connections.
3. analogue audio frequency according to claim 1 or 2 and AES3 digital audio mixed signal automatic switching control equipments, feature
It is：The mixed signal input circuit is inputted using differential signal.
4. analogue audio frequency according to claim 2 and AES3 digital audio mixed signal automatic switching control equipments, feature exist
In：It further include direct connection after power failure circuit；The direct connection after power failure circuit include input socket CN1, accessory power outlet CN4, CN5, signal after
Electric appliance JX1, JX2, JX3 and double-pole double throw magnetic latching relay JC4；
The input socket CN1 is connect with movable plate D1, D2 of signal relay JX1 respectively, the normally open end of signal relay JX1
NO1, NO2 are connect with movable plate D1, D2 of double-pole double throw magnetic latching relay JC4 respectively, and normal-closed end NC1, NC2 are double with double-pole respectively
Throw movable plate D1, D2 connection of magnetic latching relay JC4, reset terminal R41, R42 of double-pole double throw magnetic latching relay JC4 respectively with
Normal-closed end NC1, NC2 connection of signal relay JX2, set end S41, S42 of double-pole double throw magnetic latching relay JC4 respectively with
Normal-closed end NC1, NC2 connection of signal relay JX3, movable plate D1, D2 of signal relay JX2 connect analogue audio frequency accessory power outlet
Movable plate D1, D2 of CN4, signal relay JX3 meet digital audio accessory power outlet CN5.
5. analogue audio frequency according to claim 2 and AES3 digital audio mixed signal automatic switching control equipments, feature exist
In：Described audio AD conversion chip U11, U21, U31 and digital audio receive chip U12, U22, U32 and audio DA conversions
U5 is with I for chip U4 sum number word tone frequency transmission chips2S format signals are connect with Complex Programmable Logic Devices U6.
6. analogue audio frequency according to claim 1 or 2 and AES3 digital audio mixed signal automatic switching control equipments, feature
It is：Further include control and display circuit, the control and display circuit include microprocessor U7, relay drive circuit, by
Key and liquid crystal display；Complex Programmable Logic Devices in the change detection circuit is connect with microprocessor U7, described micro-
Processor U7 is connect with button and liquid crystal display；The microprocessor U7 is protected by relay drive circuit and double-pole double throw magnetic
Relay JC1, JC2, JC3 is held to connect with JC4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610860828.3A CN106375051B (en) | 2016-09-28 | 2016-09-28 | Analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipments |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610860828.3A CN106375051B (en) | 2016-09-28 | 2016-09-28 | Analogue audio frequency and AES3 digital audio mixed signal automatic switching control equipments |
Publications (2)
| Publication Number | Publication Date |
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| CN106375051A CN106375051A (en) | 2017-02-01 |
| CN106375051B true CN106375051B (en) | 2018-09-18 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114726466A (en) * | 2022-03-15 | 2022-07-08 | 成都思为交互科技有限公司 | A medium wave audio processing device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330310A (en) * | 1970-09-21 | 1973-09-19 | Arnold K | Analog-digital converter |
| US4999627A (en) * | 1989-09-25 | 1991-03-12 | At&T Bell Laboratories | Analog-to-digital converter using prescribed signal components to improve resolution |
| WO2006020431A2 (en) * | 2004-07-27 | 2006-02-23 | Multigig Inc. | Rotary flash adc |
| CN1984266A (en) * | 2005-12-16 | 2007-06-20 | 乐金电子（沈阳）有限公司 | Digital TV-set and its frequency-channel conversion |
| CN201656993U (en) * | 2010-02-08 | 2010-11-24 | 杜世清 | Novel intelligent broadcast program signal source fault monitoring and switching system |
| CN102044858A (en) * | 2009-10-21 | 2011-05-04 | 郴州郴电科技有限公司 | Multifunctional controller |
| CN105635902A (en) * | 2014-11-04 | 2016-06-01 | 中兴通讯股份有限公司 | Audio interface compatible with digital audio device and implementation method |
-
2016
- 2016-09-28 CN CN201610860828.3A patent/CN106375051B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1330310A (en) * | 1970-09-21 | 1973-09-19 | Arnold K | Analog-digital converter |
| US4999627A (en) * | 1989-09-25 | 1991-03-12 | At&T Bell Laboratories | Analog-to-digital converter using prescribed signal components to improve resolution |
| WO2006020431A2 (en) * | 2004-07-27 | 2006-02-23 | Multigig Inc. | Rotary flash adc |
| CN1984266A (en) * | 2005-12-16 | 2007-06-20 | 乐金电子（沈阳）有限公司 | Digital TV-set and its frequency-channel conversion |
| CN102044858A (en) * | 2009-10-21 | 2011-05-04 | 郴州郴电科技有限公司 | Multifunctional controller |
| CN201656993U (en) * | 2010-02-08 | 2010-11-24 | 杜世清 | Novel intelligent broadcast program signal source fault monitoring and switching system |
| CN105635902A (en) * | 2014-11-04 | 2016-06-01 | 中兴通讯股份有限公司 | Audio interface compatible with digital audio device and implementation method |
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| CN106375051A (en) | 2017-02-01 |
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