CN107071656A - Multichannel for handling many radio signals inputs gates public address set circuit - Google Patents
Multichannel for handling many radio signals inputs gates public address set circuit Download PDFInfo
- Publication number
- CN107071656A CN107071656A CN201710367792.XA CN201710367792A CN107071656A CN 107071656 A CN107071656 A CN 107071656A CN 201710367792 A CN201710367792 A CN 201710367792A CN 107071656 A CN107071656 A CN 107071656A
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- gating
- interface
- radio signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Public address set circuit is gated the invention discloses a kind of multichannel for being used to handle many radio signals inputs, including signal converting circuit, display switching circuit and speech amplifying circuit, the signal converting circuit (1) is used to gate radio signals from multiple radio signals, the display switching circuit (2) is used to show that what is currently gated has the signal of input, and the audio-amplifying circuit (3) is used to carry out the radio signals of gating volume expansion to export.The multichannel gating circuit of the present invention, by the particular circuit configurations for the display switching circuit being provided with, utilize wherein optimization and improvement circuit layout, and match to coordinate match control accordingly, and the matching connection with signal converting circuit, so as to the traffic operation between management multi-section radio station well.
Description
Technical field
The invention belongs to communication technical field, and in particular to a kind of multichannel choosing for being used to handle many radio signals inputs
Logical public address set circuit.
Background technology
In some environment, exist while connecting multi-section radio station and carrying out the demand of telephone operation respectively, in part occasion
Middle radio station quantity can be with up to 6, and wherein one radio station of selection is typically only capable in telephone operation and carries out current talking, because
This needs the switching for carrying out radio station and channel.
At present, the process of handoff radio and channel needs to realize by adjusting each radio station, and the regulation in each radio station
The link such as gating configuration of circuit when being related to setting and regulation, the switching of radio station parameters, therefore whole handoff procedure need to
The plenty of time is wasted on allocating radio, its switching efficiency and accuracy rate can not all ensure real-time needs.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the present invention provides a kind of defeated for handling many radio signals
The multichannel gating public address set circuit entered, it can solve to need in many radio station handoff procedures by the circuits improvement of optimization
The problem of carrying out radio station parameter configuration condition and low switching efficiency.
To achieve these goals, the present invention provides a kind of multichannel gating for being used to handle many radio signals inputs and expanded
Mixer circuit, it is characterised in that including the signal converting circuit being sequentially connected electrically, display switching circuit and speech amplification electricity
Road, the signal converting circuit is used to gate radio signals from multiple radio signals, and the display switching circuit is used to show
What is currently gated has the signal of input, and the audio-amplifying circuit is used to carry out the radio signals of gating volume expansion to export；
Wherein, the signal converting circuit connects including radio interface, signal gating circuit, master control and telecommunication circuit, output
Mouth, power circuit, detection isolation circuit and radio station input detecting circuit, wherein,
As a further improvement on the present invention, the power circuit corresponds to what is be connected with radio interface respectively including multiple
Diode, in addition to capacitor filtering unit and voltage regulation unit, power supply signal is after the capacitor filtering unit filtering by institute
State voltage regulation unit and carry out voltage stabilizing output, think that other circuits are powered.
As a further improvement on the present invention, the signal gating circuit, radio station input detecting circuit and detection isolation electricity
Road includes photoelectrical coupler controller, filter circuit and comparator, wherein, it is corresponding that the comparator is used for multilevel iudge
Whether signal gating circuit has signal input, and when there is signal input, feeds back corresponding signal to the master control and communication electricity
The signal that road, the master control and telecommunication circuit are used to be fed back according to the comparator controls the photoelectrical coupler to turn on, and will believe
Number access signal output interface in.
As a further improvement on the present invention, the display switching circuit includes master control and telecommunication circuit, prompt tone electricity
Road, display circuit, signal input interface, signal output interface and power circuit, wherein, the master control and telecommunication circuit difference
Be connected with signal input interface, prompting sound circuit and display circuit, signal input interface also respectively with signal output interface and electricity
Source circuit is connected, and the signal input interface receives the output signal of signal converting circuit and inputted to master control and telecommunication circuit,
The master control and telecommunication circuit are by detecting toggle switch position, and control display circuit shows current state, and controls prompt tone electricity
Road sends prompt tone, and the signal after selection is handled is sent to the signal output interface with straight by signal input interface
Connect output.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show
Beneficial effect：
(1) multichannel gating circuit of the invention, by the particular circuit configurations for the display switching circuit being provided with,
Using wherein optimization and improvement circuit layout, and match to coordinate match control, and the company with signal converting circuit accordingly
Matching is connect, so as to the traffic operation between management multi-section radio station well.
(2) multichannel gating circuit of the invention, can be good at providing wider array of communicate of scope for loading vehicles and listens to
Scope.
Brief description of the drawings
Fig. 1 gates the dress that amplifies for a kind of multichannel for being used to handle many radio signals inputs of one embodiment of the invention
The principle composition frame chart of circuits；
Fig. 2 is the principle schematic of signal converting circuit in Fig. 1；
Fig. 3 is the principle schematic of radio interface in Fig. 2；
Fig. 4 is the principle schematic of signal gating circuit in Fig. 2；
Fig. 5 is the principle schematic of master control and telecommunication circuit in Fig. 2；
Fig. 6 is the principle schematic of output interface circuit in Fig. 2；
Fig. 7 is the principle schematic of switching power circuit in radio station in Fig. 2；
Fig. 8 is the principle schematic of input state detection isolation circuit in Fig. 2；
Fig. 9 is the principle schematic of input state detection circuit in Fig. 2；
Figure 10 is to show the structural representation of switching circuit in Fig. 1；
Figure 11 is to show the principle schematic of switch prompting sound circuit in Figure 10；
Figure 12 is the principle schematic of status display circuit in Figure 10；
Figure 13 is to show the principle schematic of partial circuit in switching circuit in Figure 10；
In all of the figs, same reference represents identical technical characteristic, is specially：1 is signal converting electricity
Road；2 be display switching circuit；3 be audio-amplifying circuit；11 be radio interface；12 be signal gating circuit；13 be the first master control and
Telecommunication circuit；14 be output interface；15 be power circuit；16 be detection isolation circuit；17 be radio station input detecting circuit；21
For the second master control and telecommunication circuit；22 be prompting sound circuit；23 be display circuit；24 be signal input interface；25 be that signal is defeated
Outgoing interface；26 be power circuit；Rx represents resistance；Cx represents electric capacity；Dx represents diode；RLx, ISOx represent photoelectric coupling
Device；Vx represents integrated three-terminal regulator；Jx, JPx represent connector；SWx is switch element；Ux represents integrated chip；Above x
Represent index value.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples,
The present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain the present invention,
It is not intended to limit the present invention.
As long as in addition, technical characteristic involved in each embodiment of invention described below is each other
Not constituting conflict can just be mutually combined.
Fig. 1 gates the dress that amplifies for a kind of multichannel for being used to handle many radio signals inputs of one embodiment of the invention
The principle composition frame chart of circuits；Fig. 2 is the principle schematic of the signal converting circuit 1 of circuit in Fig. 1；Fig. 3 is aobvious in Fig. 1
Show the principle schematic of switching circuit 2；Fig. 4 is the principle schematic of audio-amplifying circuit 3 in Fig. 1.
As shown in figure 1, the multichannel gating public address set circuit bag for being used to handle many radio signals inputs of the present embodiment
Include signal converting circuit 1, display switching circuit 2 and audio-amplifying circuit 3.Wherein, signal converting circuit 1 is used for gating signal, display
Switching circuit 2, which is used to show in the signal for currently having input, the present embodiment, preferably uses MAX485 chips, and itself and display are transferred
Circuit enters row data communication；Audio-amplifying circuit 3 is used to expand volume.
As illustrated in fig. 1 and 2, signal converting circuit 1 includes radio interface 11, signal gating circuit 12, master control and communication electricity
Road 13, output interface 14, power circuit 15, detection isolation circuit 16, radio station input detecting circuit 17.
As shown in Fig. 2 radio interface 11 can be multiple, for being connected respectively with the matching of multi-section radio station, the present embodiment
Radio interface quantity is preferably 6 in Fig. 2, but the quantity of radio interface 11 is not construed as limiting in the present invention, can be according to reality
Demand carries out specifically chosen.
As shown in Fig. 2 signal gating circuit 12 is multiple with the quantity Matching of radio interface 11, in Fig. 2 of the present embodiment
Preferably 6, but the quantity of signal gating circuit 12 is not construed as limiting in the present invention, it can carry out according to the actual requirements specific
Selection, if with the quantity Matching of radio interface 12.Each signal gating circuit 12 respectively with corresponding radio interface 11 one by one
Connection, by the radio signals input signal gating circuit 12 of the corresponding interface.
Power connector and each radio interface 11 are connected with power circuit 15, and each one end of radio interface 11 is used for
It is connected with outside radio signals, the other end is connected with corresponding signal gating circuit 12.
Power circuit 15 is respectively that each several part circuit provides power supply.Power circuit 15 is subjected to power connector and independently supplied
Electricity and radio interface are powered two ways.As shown in Fig. 2 power circuit 15 corresponds respectively to electricity including multiple in the present embodiment
Diode, capacitor filtering unit and voltage regulation unit that platform interface 11 is connected, power supply is through diode current flow and through the capacitor filtering
Voltage stabilizing output is carried out by voltage regulation unit after unit filtering.
Each signal gating circuit 12 is also connected with signal converting output interface 14, master control and telecommunication circuit 13 simultaneously, main
Control and telecommunication circuit 13 gate one of them have signal input signal radio interface 11 be connected to by gating circuit 12 it is defeated
Outgoing interface 14, for the processing that shows and amplify.
Master control and telecommunication circuit 13 include the minimum system circuit and one piece of such as MAX458 communication core of one piece of single-chip microcomputer
Piece, realizes the processing to communication data and gating and the identification operation of input signal by way of the program of writing.The present invention
In scheme, control unit U15 is preferably single-chip microcomputer, and it controls unlike signal loop and detection by different pins respectively
Input state.In radio interface when wherein having signal input all the way, corresponding pin detects low level, indicates that signal is defeated
Enter.Control unit U15 determines the input state of radio interface 11 according to the low level signal received, and according to display switching electricity
The control command on road controls the photoelectrical coupler conducting in corresponding gating circuit 12 so that corresponding signal is connect by output
Mouth output, telecommunication circuit uses 485 standard communication protocols.
Gating circuit 12 and detection signal isolation circuit 16 include photoelectrical coupler controller, radio station input detecting circuit
17 include filter circuit and comparator, and the gating of signal is by photoelectrical coupler control (RL1, RL2, RL3 in such as Fig. 2,3
Photoelectrical coupler composition is gated all the way), when master control and telecommunication circuit 13 provide control signal (preferably low level), photoelectricity coupling
The LED of clutch is lighted, and signal is accessed into output interface 14.When there is signal input, signal is through in the input detecting circuit of radio station
Filter circuit after, then through comparator multilevel iudge whether have voice signal input, if having phonetic entry by detect every
Give control unit one low level from the photoelectrical coupler in circuit 16, indicate signal input.
Conventional signaling switch device has relay, FET, triode, controllable silicon.Wherein only have relay to carry
Isolation, can avoid the coupling of control signal and input signal well, but relay is per se with big coil, in adhesive and
Larger induced field can be produced during release interference is produced to signal.The present embodiment is preferred to use photoelectrical coupler, can be with
The problem of solving interference well and isolate.Whether conventional detection radio station have audio input is examined by PTT signals
Survey, the method to determine whether signal input is preferred to use by directly detecting audio signal in the present embodiment, directly put
PTT signal wires are taken off.
As shown in figs. 1 and 10, display switching circuit includes master control and telecommunication circuit 21, prompting sound circuit 22, display circuit
23rd, signal input interface 24, signal output interface 25, power circuit 26.Wherein, master control and telecommunication circuit 21 respectively with signal
Input interface 24, prompting sound circuit 22 and display circuit 23 are connected, signal input interface 24 also respectively with signal output interface 25
Connected with power circuit 26, signal input interface 24 is by positive-negative power, the output signal of signal converting circuit 1, communication data
Introduce, master control and telecommunication circuit 21 are by detecting toggle switch position, and control display circuit 23 shows current state, and controls
Prompting sound circuit 26 sends prompt tone, and signal output interface 25 directly exports selected signal.
As shown in Figure 11~13, master control and telecommunication circuit 21 mainly for detection of rotary switch SW3 state, and according to
State sends control command to signal converting circuit 1, selects certain to pass through all the way.When prompting sound circuit 22 is used to have signal input
Auditory tone cues is sent, is mainly made up of buzzer and triode.Display circuit 23 is used for the input state for showing signal, by LED
Lamp is constituted.Power circuit 26 is made up of integrated voltage-stabilized chip to be constituted, and is powered for display switching circuit.Signal input 24 and signal
Output 25 is preferably all connector, for connecting the main circuit in 3 parts.
As shown in Fig. 1 and 13, it is defeated that audio-amplifying circuit includes filter circuit, radio signals amplifying circuit, external interface, speech
Enter circuit, output matching circuit, power circuit.Wherein, the existing signal input of external interface has signal output, the letter of input again
Number by becoming physical sound after signal amplification circuit.Speech input circuit is used to physical sound being converted to electric signal,
After amplifying again through speech amplifying circuit, by output matching circuit and filter circuit cascaded-output.Filter circuit is used to cut display
The radio signals for changing circuit transmission are filtered processing.Radio signals amplifying circuit, which is used to amplify, shows switching circuit transmission
Radio signals simultaneously switch to sound by loudspeaker.Speech input circuit is used to receive voice signal, and sound is converted into electric signal,
PTT signals are sent simultaneously.Speech amplifying circuit is used to amplify voice signal, faint voice signal is easy to transmission after amplifying.
Output matching circuit is used to be matched the signal after amplification with the input requirements in radio station.Power circuit is by integrated voltage-stabilized core
Piece is constituted, for being powered to audio-amplifying circuit 1.
During work, when one of radio station, to have signal to enter fashionable, input state detection circuit 17 and input state detection
Isolation circuit 16 has detected and has detected low level, subsequent single-chip microcomputer on signal input, master control and the corresponding pin of telecommunication circuit 13
Master control and telecommunication circuit 21 into display switching circuit 2 send status command at regular intervals.Master control and telecommunication circuit 21
According to status command by the dispaly state of display circuit 23, meanwhile, master control and the detection rotary switch of telecommunication circuit 21 SW3 shape
State, if stateful change, control prompting sound circuit 22 provides prompt message；Sent at regular intervals if not changing
Radio present select command word is to the master control in signal converting circuit 1 and telecommunication circuit 13, the monolithic in signal converting circuit 1
Machine passes through all the way according to the selection correspondence of command word control signal gating circuit 12, and signal flows through display switching circuit and eventually arrived at
Audio-amplifying circuit, carries out the passback of radio signals enhanced processing and voice signal.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should wrap
It is contained within protection scope of the present invention.
Claims (4)
1. a kind of multichannel gating public address set circuit for being used to handle many radio signals inputs, it is characterised in that including successively
Signal converting circuit (1), display switching circuit (2) and the speech amplifying circuit (3) of electrical connection, the signal converting circuit (1)
For gating radio signals from multiple radio signals, the display switching circuit (2) is used to show that what is currently gated has input
Signal, the audio-amplifying circuit (3) is used to carrying out volume to the radio signals of gating expanding to export；
Wherein, the signal converting circuit (1) includes radio interface (11), signal gating circuit (12), master control and telecommunication circuit
(13), output interface (14), power circuit (15), detection isolation circuit (16) and radio station input detecting circuit (17), wherein, institute
It is to be and the radio interface with flux matched multiple of external electrical number of units, the signal gating circuit (12) to state radio interface (11)
(11) quantity Matching is multiple, and is connected one to one with the radio interface (11), the power circuit (15) respectively with respectively
The individual signal gating circuit (12), the signal converting output interface (14) and the master control and telecommunication circuit (13) connection,
To be powered respectively, the signal gating circuit (12) also simultaneously with the signal output interface (14) and described control unit
(16) connect, described control unit (16) gates the signal of one of them signal socket connector (12) input that there is signal to input extremely
The master control of correspondence connection and telecommunication circuit (13) handle and and then export to signal output interface (14), for display and
Amplify processing.
2. a kind of multichannel gating public address set circuit for being used to handle many radio signals inputs according to claim 1,
Wherein, the power circuit (15) includes multiple diodes for corresponding to be connected with radio interface (11) respectively, in addition to electric capacity filter
Ripple unit and voltage regulation unit, it is defeated that power supply signal carries out voltage stabilizing after the capacitor filtering unit filtering by the voltage regulation unit
Go out, think that other circuits are powered.
3. a kind of multichannel gating public address set electricity for being used to handle many radio signals inputs according to claim 1 or 2
Road, wherein, the signal gating circuit (12), radio station input detecting circuit (17) and detection isolation circuit (16) include photoelectricity coupling
Clutch controller, filter circuit and comparator, wherein, the comparator is used for the corresponding signal gating circuit of multilevel iudge
(12) whether there is signal input, and when there is signal input, feed back corresponding signal to the master control and telecommunication circuit (13), institute
The signal that stating master control and telecommunication circuit (13) is used to be fed back according to the comparator controls the photoelectrical coupler to turn on, by signal
Access in signal output interface (14).
4. a kind of multichannel gating for being used to handle many radio signals inputs according to any one of claim 1 to 3 expands
Mixer circuit, wherein, the display switching circuit includes master control and telecommunication circuit (21), prompting sound circuit (22), display electricity
Road (23), signal input interface (24), signal output interface (25) and power circuit (26), wherein, the master control and communication electricity
Road (21) is connected with signal input interface (24), prompting sound circuit (22) and display circuit (23) respectively, signal input interface
(24) also it is connected respectively with signal output interface (25) and power circuit (26), the signal input interface (24) receives signal and turned
Connect the output signal of circuit (1) and input to master control and telecommunication circuit (21), the master control and telecommunication circuit (21) are dialled by detection
The section position of the switch, control display circuit (23) shows current state, and controls prompting sound circuit (26) to send prompt tone, and will choosing
The signal after processing is selected to send to the signal output interface (25) directly to export by signal input interface (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367792.XA CN107071656B (en) | 2017-05-23 | 2017-05-23 | Multichannel gating loudspeaker circuit for processing multi-station signal input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710367792.XA CN107071656B (en) | 2017-05-23 | 2017-05-23 | Multichannel gating loudspeaker circuit for processing multi-station signal input |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107071656A true CN107071656A (en) | 2017-08-18 |
| CN107071656B CN107071656B (en) | 2023-04-28 |
Family
ID=59609794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710367792.XA Active CN107071656B (en) | 2017-05-23 | 2017-05-23 | Multichannel gating loudspeaker circuit for processing multi-station signal input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107071656B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080741A (en) * | 1992-12-25 | 1994-01-12 | 南京航空航天大学 | Multi-channel intelligent damp-warm syndrome degree measurement and control instrument |
| CN101097444A (en) * | 2006-06-29 | 2008-01-02 | 深圳创维－Rgb电子有限公司 | Information source switching mechanism |
| CN101242679A (en) * | 2008-02-29 | 2008-08-13 | 中兴通讯股份有限公司 | A share audio power amplification circuit for multi-audio source and its control method |
| CN101494818A (en) * | 2008-12-26 | 2009-07-29 | 广州励丰声光科技有限公司 | Multichannel audio standby system |
| CN201926893U (en) * | 2010-12-24 | 2011-08-10 | 南京莱斯信息技术股份有限公司 | Multi-service communication control platform with matched transmitter-receiver |
| CN102708823A (en) * | 2012-06-01 | 2012-10-03 | 天马微电子股份有限公司 | Automatic switching circuit for RS232 interface and RS485 interface and serial port liquid crystal display module |
| CN103108258A (en) * | 2011-11-11 | 2013-05-15 | 广州美电贝尔电业科技有限公司 | Telephone intercom system |
| CN204157013U (en) * | 2014-11-07 | 2015-02-11 | 深圳市昭行云科技有限公司 | A kind of control device and voice communication system switching multichannel voice frequency |
| US20170127726A1 (en) * | 2014-06-30 | 2017-05-11 | Kimree Hi-Tech Inc. | Control circuit, electronic cigarette and method for controlling electronic cigarette |
| CN206948592U (en) * | 2017-05-23 | 2018-01-30 | 武汉中电通信有限责任公司 | Multichannel for handling more radio signals inputs gates public address set circuit |
-
2017
- 2017-05-23 CN CN201710367792.XA patent/CN107071656B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080741A (en) * | 1992-12-25 | 1994-01-12 | 南京航空航天大学 | Multi-channel intelligent damp-warm syndrome degree measurement and control instrument |
| CN101097444A (en) * | 2006-06-29 | 2008-01-02 | 深圳创维－Rgb电子有限公司 | Information source switching mechanism |
| CN101242679A (en) * | 2008-02-29 | 2008-08-13 | 中兴通讯股份有限公司 | A share audio power amplification circuit for multi-audio source and its control method |
| CN101494818A (en) * | 2008-12-26 | 2009-07-29 | 广州励丰声光科技有限公司 | Multichannel audio standby system |
| CN201926893U (en) * | 2010-12-24 | 2011-08-10 | 南京莱斯信息技术股份有限公司 | Multi-service communication control platform with matched transmitter-receiver |
| CN103108258A (en) * | 2011-11-11 | 2013-05-15 | 广州美电贝尔电业科技有限公司 | Telephone intercom system |
| CN102708823A (en) * | 2012-06-01 | 2012-10-03 | 天马微电子股份有限公司 | Automatic switching circuit for RS232 interface and RS485 interface and serial port liquid crystal display module |
| US20170127726A1 (en) * | 2014-06-30 | 2017-05-11 | Kimree Hi-Tech Inc. | Control circuit, electronic cigarette and method for controlling electronic cigarette |
| CN204157013U (en) * | 2014-11-07 | 2015-02-11 | 深圳市昭行云科技有限公司 | A kind of control device and voice communication system switching multichannel voice frequency |
| CN206948592U (en) * | 2017-05-23 | 2018-01-30 | 武汉中电通信有限责任公司 | Multichannel for handling more radio signals inputs gates public address set circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107071656B (en) | 2023-04-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101820372A (en) | TDM (Time Division Multiplexing) single-bus communication system of power supply, data signals and audio analog signals | |
| CN104602160B (en) | A kind of digital sound box and attaching method thereof | |
| CN206506669U (en) | A kind of differential-to-single-ended change-over circuit and bluetooth earphone for bluetooth earphone | |
| CN106100858A (en) | A kind of standard POE is integrated with forcing nonstandard POE by electricity power circuit | |
| WO2017101170A1 (en) | Three-button earphone control box optimization circuit capable of switching android or apple system | |
| CN104254040B (en) | Mobile communication terminal Audio conversion system | |
| CN206948592U (en) | Multichannel for handling more radio signals inputs gates public address set circuit | |
| CN103220156B (en) | A kind of multiterminal mouth POE for passive light network powers device and method of supplying power to | |
| CN204795748U (en) | Intelligence LED music lamp | |
| CN107071656A (en) | Multichannel for handling many radio signals inputs gates public address set circuit | |
| CN104010148B (en) | Power circuit and television set | |
| CN206294300U (en) | A kind of set CARPLAY communications and the device of USB transmission | |
| CN106941640B (en) | Earphone | |
| CN102055312B (en) | Voice control switch | |
| CN206863886U (en) | One kind control debugging apparatus and infrared emission system | |
| CN205263522U (en) | Fiber optic conversion ware module intelligence wireless access device based on CPLD | |
| CN208971750U (en) | A kind of earphone | |
| CN203849596U (en) | Stage television entertainment system controlled by bluetooth | |
| CN212874952U (en) | Socket capable of intelligently controlling on-off of multiple paths through voice | |
| CN206402249U (en) | Smart home intelligent gateway central control circuit | |
| CN219834164U (en) | Network playing terminal and broadcasting equipment with self-adaptive POE power supply | |
| CN206251103U (en) | A kind of signal protection circuit and device | |
| CN108134987A (en) | A kind of transceiver apparatus | |
| CN204810528U (en) | Converting circuit based on input of bluetooth audio frequency source | |
| CN204258741U (en) | A kind of power amplification device for repeater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |