CN104486672B - NFC volume control circuits and NFC volume adjusting methods - Google Patents
NFC volume control circuits and NFC volume adjusting methods Download PDFInfo
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- CN104486672B CN104486672B CN201410834059.0A CN201410834059A CN104486672B CN 104486672 B CN104486672 B CN 104486672B CN 201410834059 A CN201410834059 A CN 201410834059A CN 104486672 B CN104486672 B CN 104486672B
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- 238000002955 isolation Methods 0.000 claims abstract description 32
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- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000006854 communication Effects 0.000 abstract description 23
- 238000004891 communication Methods 0.000 abstract description 22
- 238000013461 design Methods 0.000 abstract description 10
- 230000033228 biological regulation Effects 0.000 abstract description 7
- 230000000977 initiatory effect Effects 0.000 description 8
- 101150052401 slc44a1 gene Proteins 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/439—Processing of audio elementary streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
- H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
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- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Selective Calling Equipment (AREA)
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Abstract
The invention provides a kind of NFC volume control circuits and NFC volume adjusting methods, the volume adjusting button of equipment can be reduced.Circuit includes NFC module, start control circuit, starting up's circuit, isolation circuit, volume control circuit and volume adjusting control port；After NFC module receives start-up command, by start control circuit control starting up circuit start, and output control signal starts isolation circuit work after powering, the signal output part of NFC module and the input of start control circuit are cut off by isolation circuit, the instruction that NFC module receives again is received by volume control circuit.This case is based on NFC boot-strap circuits, after being started shooting in a manner of NFC, NFC module is isolated with start control circuit by isolation circuit, hereafter the regulation of NFC module control device volume in a manner of near-field communication is reused, the volume adjusting button of equipment can be effectively reduced, so as to simplify the configuration design of equipment.
Description
Technical field
The present invention relates to technical field of circuit design, and in particular to a kind of NFC volume control circuits and based on the NFC volumes
Adjust the NFC volume adjusting methods of circuit.
Background technology
User is for multimedia play equipments such as TV, set top boxes, except to performance requirement more and more higher, to profile
The requirement of design also more and more higher.
By taking TV as an example, requirement of the user to TV profile tends to slimming and simplicity, and therefore, producer is in design TV
During profile, the button of TV in itself is reduced as far as possible to simplify the configuration design of TV.One of which application is, in TV
Portion sets NFC（Near Field Communication, near-field communication）Module, while corresponding NFC is set in remote control
Module, near-field communication is established between remote control and TV by the NFC module of remote control and the NFC module of TV, at the two
Between establish near-field communication after, remote control by near-field communication modes to TV send start-up command, realize the start to TV,
So as to save the standby button of TV.
The content of the invention
The present invention is started shooting by providing a kind of NFC volume control circuits and NFC volume adjusting methods based on existing NFC
Circuit, the number of keys of equipment can be further reduced, reach the technique effect of simplified equipment configuration design.
In order to solve the above technical problems, the present invention is achieved using following technical scheme：
It is proposed a kind of NFC volume control circuits, including NFC module；Also include ON-OFF control circuit, starting up's circuit,
Isolation circuit, volume control circuit and volume adjusting control port；The signal output part connection switch control of the NFC module
The input of circuit processed, the output end of the ON-OFF control circuit connect the input of starting up's circuit；The start
First control output end of start-up circuit connects the control signal of the isolation circuit；The isolation circuit is connected to described
Between the input of the signal output part of NFC module and the ON-OFF control circuit；The input of the volume control circuit connects
The signal output part of the NFC module is connect, the output end of the volume control circuit connects the volume adjusting control port.
Further, it is in series between the input of the signal output part of the NFC module and the ON-OFF control circuit
First diode.
Further, it is in series between the input of the signal output part of the NFC module and the ON-OFF control circuit
The charge-discharge circuit being made up of first resistor and the first electric capacity；The first end of wherein described first resistor connects the NFC module
Signal output part, the second end of the first resistor connects the first end of first electric capacity all the way, described in another way connection
The input of ON-OFF control circuit；The other end ground connection of first electric capacity.
Further, the NFC volume control circuits also include working power；The ON-OFF control circuit is opened including first
Guan Guan, second switch pipe, the 8th resistance and the 9th resistance；The control of the control terminal of the first switch pipe and the second switch pipe
End processed all connects the signal output part of the NFC module；The input of the first switch pipe and the second switch pipe all connects
Connect the working power；The output end of the first switch pipe connects the first input end of starting up's circuit all the way, separately
It is grounded after connecting the 8th resistance all the way；The output end of the second switch pipe connects the of starting up's circuit all the way
Two inputs, another way are grounded after connecting the 9th resistance.
Further, the isolation circuit includes the 3rd switching tube, second resistance and 3rd resistor；The second resistance
First end connects the signal output part of the NFC module, and the second end of the second resistance connects the first of the 3rd resistor
End, the second end ground connection of the 3rd resistor；First control output end of starting up's circuit connects the second resistance
With the junction of the 3rd resistor；The first control that the control terminal of 3rd switching tube connects starting up's circuit is defeated
Go out end, the input of the 3rd switching tube connects the signal output part of the NFC module, the output end of the 3rd switching tube
Connect the input of the ON-OFF control circuit.
Further, the isolation circuit includes the 4th switching tube；Opened described in the control terminal connection of 4th switching tube
First control output end of machine start-up circuit, the input of the 4th switching tube connect the signal output part of the NFC module,
The output head grounding of 4th switching tube.
Further, the volume control circuit includes the second diode and the 3rd diode；Second diode
Positive pole connects the signal output part of the NFC module, and the negative pole of second diode connects the positive pole of the 3rd diode,
The negative pole of 3rd diode connects the volume adjusting control port.
Further, the volume control circuit includes the 5th switching tube, the 6th switching tube, the 7th switching tube, the 4th electricity
Resistance, the 5th resistance, the 6th resistance, the 7th resistance and the second electric capacity；The 5th switching tube input connects the working power,
The 4th resistance is connected between the input and control terminal of 5th switching tube；And the control terminal of the 5th switching tube connects
The input of the 6th switching tube is connect, the output end of the 6th switching tube connects the input of the 7th switching tube；Institute
The output head grounding of the 7th switching tube is stated, the control terminal of the 7th switching tube connects the first control of starting up's circuit
Output end；The first end of 5th resistance connects the signal output part of the NFC module, and the second end of the 5th resistance connects
Connect the first end of the 6th resistance, the second end ground connection of the 6th resistance；The control terminal connection institute of 6th switching tube
State the junction of the 5th resistance and the 6th resistance；The output end of 5th switching tube is connecting second electric capacity just
Pole, the negative pole of second electric capacity connect the volume adjusting control port；The negative pole of second electric capacity connects described over the ground
7th resistance.
A kind of NFC volume adjusting methods are proposed, including：Start-up command is received from NFC module；Based on the start-up command to
Starting up's circuit sends start control signal, to cause starting up's circuit to export the first control signal after powering；
First control signal is used to start isolation circuit, is adjusted so that the isolation circuit isolates the volume that the NFC module receives
Section instruction is not received by the ON-OFF control circuit；From the NFC module volume of reception regulating command, and it is based on the volume
Regulating command control volume adds deduct.
Further, it is described to control adding deduct specially for volume：Often receive volume adjusting instruction one secondary noise of increase
Amount, until volume increases to maximum；And after volume adjusting to maximum, often receive a volume adjusting instruction and reduce a secondary noise
Amount, until volume is decreased to minimum.
Compared with prior art, the technical scheme that the embodiment of the present application provides, the technique effect or advantage having are：This Shen
Please embodiment the NFC volume control circuits and NFC volume adjusting methods that propose, it is electric in device power-up after using NFC starts,
So as to export a control signal by the first control output end of starting up's circuit, the control signal is used for controlling isolation electricity
Road works so that the instruction that NFC module continues to will not be switched on and off control circuit and receive, and then continue to connect by NFC module
The instruction of receipts is received by volume control circuit, and is produced volume adjusting instruction output by volume control circuit and controlled to volume adjusting
Port, realize the regulation to the volume of equipment；Thus achieve after equipment is started shooting by NFC modes, can be with near-field communication
The volume of mode adjustment equipment, the volume adjusting button of equipment is eliminated, so as to simplify the configuration design of equipment.
Brief description of the drawings
Fig. 1 is the circuit frame figure for the NFC volume control circuits that the embodiment of the present application proposes；
Fig. 2 is the circuit diagram for the specific NFC volume control circuits that the embodiment of the present application proposes；
Fig. 3 is the circuit diagram for the another specific NFC volume control circuits that the embodiment of the present application proposes；
Fig. 4 is the NFC volume adjusting method flow charts that the embodiment of the present application proposes.
Embodiment
The embodiment of the present application is realized and led to near field by providing a kind of NFC volume control circuits and NFC volume adjusting methods
The mode of letter adjusts volume, reaches the technique effect of simplified equipment configuration design.
Near-field communication（Near Field Communication, NFC）For the short distance wireless communication technology, available range is about
For 20 centimetres, it is allowed to contactless Point-to-Point Data Transmission is carried out between electronic equipment, data is exchanged, is a kind of private closely
Close communication mode.Two electronic equipments of Point-to-Point Data Transmission are realized with near-field communication modes, one is initiating equipment（Master sets
It is standby）, one is target device（Slave unit）, main equipment provides radiofrequency field in whole communication process, and transmission rate may be selected, will
Data are sent to slave unit；And slave unit need not produce radiofrequency field, and load modulation technique can is used with same speed
Pass data back main equipment.
After all NFC module is set between both devices, and it is initiating equipment to set one of them, and another is target
Equipment, then radiofrequency field is produced by initiating equipment, after target device Close approach initiating equipment, target device is set based on initiation
Standby caused radiofrequency field transfers data to initiating equipment.Based on the technology, equipment, such as the start work(of TV can be realized
Can, in television standby, keep the power supply of equipment NFC module to produce radiofrequency field, when the close electricity of the remote control for being provided with NFC module
Depending on NFC module when, the two establishes near-field communication, and remote control sends start-up command by radiofrequency field to TV, and TV is receiving
To after start-up command, start television startup.
The present invention implements the NFC volume control circuits and NFC volume adjusting methods proposed, based on above-mentioned NFC technique, equipment
After being started shooting based on near-field communication modes, it can continue based on communication mode regulation volume of marching into the arena, so as to save the sound of equipment
Measure regulating key.
It is right below in conjunction with Figure of description and specific embodiment in order to be better understood from above-mentioned technical proposal
Above-mentioned technical proposal is described in detail.
As shown in figure 1, the NFC volume control circuits proposed for the embodiment of the present application, including NFC module 11, switch control
Circuit 12, starting up's circuit 13, isolation circuit 14, volume control circuit 15 and volume adjusting control port 16；NFC module
The input of signal output part connecting valve control circuit, the output end of ON-OFF control circuit connect starting up's circuit
Input；The control signal of the first control output end ctl1 connections isolation circuit of starting up's circuit；Isolation circuit
It is connected between the signal output part of NFC module and the input of ON-OFF control circuit；The input connection of volume control circuit
The signal output part of NFC module, the output end connection volume adjusting control port of volume control circuit.
By taking TV as an example, when television standby, NFC module produces radiofrequency field, the access of target device is waited, when target is set
Standby access radiofrequency field and after transmitting starting-up signal, TV receives start-up command from NFC module, and the start-up command sends switch control to
Circuit processed, start control signal is produced by ON-OFF control circuit and gives starting up's circuit, starting up's circuit is based on start and controlled
Electric on signal enabling TV, starting up's circuit after upper electricity then exports a control signal from its first control output end,
Control signal control isolation circuit starts, and makes that from the instruction that NFC module continues to switch control electricity will not be sent to again
Road, and be sent to volume control circuit, then after powering, the volume adjusting instruction that target device is sent to initiating equipment can only
Received by volume control circuit, and final volume adjusting is produced by volume control circuit and instructed come the volume of adjustment equipment.
Based on above-mentioned, realize after equipment is started shooting by NFC modes, can in a manner of near-field communication adjustment equipment sound
Amount, the volume adjusting button of equipment is eliminated, so as to simplify the configuration design of equipment.
A specifically, as shown in Fig. 2 physical circuit figure of the NFC volume control circuits proposed for the embodiment of the present application.
Starting up's circuit can be existing NFC starting up circuit, as long as the signal of ON-OFF control circuit output can be received afterwards
Start is realized, that is, receives starting-up signal and realizes starting up's circuit of start and not this Applicant's Abstract graph innovation point.In order to
The apparent intention for understanding the application is illustrated, the particular circuit configurations of starting up's circuit are eliminated in Fig. 2, are only illustrated
Be related to the application signal input output end.
Among these, it is in series with the one or two pole between the signal output part 1 and the input of ON-OFF control circuit of NFC module 11
Pipe D1；First diode D1 plays a part of one-way commutation；NFC module signal output part and ON-OFF control circuit it is defeated
The charge-discharge circuit being made up of first resistor R1 and the first electric capacity C1 can also be in series between holding by entering；Wherein first resistor R1's
First end connects the signal output part of NFC module, and first resistor R1 the second end connects the first electric capacity C1 one end all the way, another
The input of road connecting valve control circuit；First electric capacity C1 other end ground connection.In this circuit, the first of first resistor R1
The first diode D1 of end connection negative pole, the input of first resistor R1 the second end connecting valve control circuit.
ON-OFF control circuit includes first switch pipe Q1, second switch pipe Q2, the 8th resistance R8 and the 9th resistance R9；First
Switching tube Q1 control terminal Qctl1 and second switch pipe Q2 control terminal Qctl2 connect the signal output part of NFC module 11；
First switch pipe Q1 and second switch pipe Q2 input 3 all connect working power VDD；First switch pipe Q1 output end 1 one
Road connects the first input end In1 of starting up's circuit, and another way is grounded after connecting the 8th resistance R8；Second switch pipe Q2's is defeated
Go out the second input In2 of 1 one tunnels of end connection starting up's circuit, another way is grounded after connecting the 9th resistance R9.Normal conditions
Under, first switch pipe Q1 and second switch pipe Q2 output end, one is used for generation system power on signal, and one is used for producing
NFC matches detection signal, so as to realize that NFC quickly matches start.
Isolation circuit includes the 3rd switching tube Q3, second resistance R2 and 3rd resistor R3；Second resistance R2 first end connects
The signal output part of NFC module 11 is connect, second resistance R2 the second end connects 3rd resistor R3 first end, 3rd resistor R3's
Second end is grounded；The the first control output end ctl1 connection second resistance R2 and 3rd resistor R3 of starting up's circuit connection
Place；First control output end ctl1 of the 3rd switching tube Q3 control terminal Qctl3 connection starting up's circuits, the 3rd switching tube
Input 2 connects the signal output part 1 of NFC module, the input of the 3rd switching tube Q3 connecting valve control circuit of output end 3
End.
Volume control circuit includes the second diode D2 and the 3rd diode D3；Second diode D2 positive pole connection NFC
The signal output part 1 of module 11, the second diode D2 negative pole connect the 3rd diode D3 positive pole, and the 3rd diode D3's is negative
Pole connection volume adjusting control port 16；Among these, D2 and D3 plays a part of preventing reversely and produces forward voltage drop.
Above-mentioned, when first switch pipe Q1 and second switch pipe Q2 are NPN triode, control terminal is NPN transistor base, defeated
It is NPN triode colelctor electrode to enter end 3, and output end 1 is NPN triode emitter stage；First switch pipe Q1 and second switch pipe
When Q2 is NMOS FETs, control terminal is NMOS fet gates, and input 3 is NMOS FET drains, and defeated
It is NMOS FET source electrodes to go out end 1；3rd switching tube is PMOS FETs, and control terminal is PMOS fet gates, defeated
It is PMOS FET drains to enter end 2, and output end 3 is PMOS FET source electrodes.
NFC volume control circuits as shown in Figure 2, first switch pipe Q1 and second switch pipe Q2 are NMOS FETs,
3rd switching tube Q3 is PMOS FETs.Before start, the NFC module of NFC module and target device establishes near-field communication
Afterwards, the start-up command that target device is sent is received, start-up command passes through the first diode D1, and then by first resistor R1 to the
One electric capacity C1 charges, and is raised with C1 voltage so that partial pressure and the voltage at the ends of first resistor R1 second on second resistance R2
Pressure difference reach the 3rd switching tube Q3 conducting voltage after, the 3rd switching tube Q3 conducting, and with the first electric capacity C1 voltage after
Height of continuing rising, the conducting until making first switch pipe Q1 and second switch pipe Q2 so that the first output end In1 of ON-OFF control circuit
All produced with the second output end In2 and provide start by the low level change uprised, the level of this change for starting up's circuit
Control signal, control starting up's circuit perform start；Starting up's circuit of start is immediately in its first control output end
ctl1（It is in high-impedance state before start, vacantly）Export high level signal（High level signal is useful signal in the present embodiment, energy
Q3 is enough turned off, in other embodiments by increasing some level shifting circuits or realizing low level effectively to turn off
Q3）.
The high level signal increases 3rd resistor R3 and second resistance R2 junctions voltage so that the 3rd switching tube Q3
The rise of control terminal voltage so that the 3rd switching tube Q3 disconnects, the command signal received again by NFC module afterwards will not be by
ON-OFF control circuit receives, and is received by volume control circuit, and NFC power up functions switch to NFC volume adjusting functions.
After device power-up, the detection to volume adjusting control port 16 can be just performed, has detected whether that volume adjusting refers to
Order, now, then the instruction received from NFC module 11 is sent to volume adjusting control by the second diode D2 and the 3rd diode D3
Port 16 processed, often receives once command by near-field communication（Such as high level）, it is increased by or reduces a volume；Specifically,
N level of sound volume can be set, performs one direction control volume, then volume reduces as the number for receiving instruction first increases,
Such as 1-2- ... .-n- (n-1)-(n-2) ... ..2-1.
Specific second diode D2 and the 3rd diode D3 effect, it is to produce a pressure drop, avoid due to NFC
Maloperation caused by the signal that module 11 inputs, it is determined that being just considered that the volume adjusting of high level refers to when being only more than certain value
Order.Meanwhile the pressure drop of the diode by two series connection, and the protection to volume adjusting control port 16, prevent NFC module
Damage of the overtension of 11 input signals to volume adjusting control port 16.
As shown in figure 3, the circuit diagram of another NFC volume control circuit proposed for the embodiment of the present application, among these, every
Include the 4th switching tube Q4 from circuit；First control output end of the 4th switching tube Q4 control terminal connection starting up's circuit
The signal output part of ctl1, the 4th switching tube Q4 input connection NFC module 11, the 4th switching tube Q4 output head grounding.
In this circuit, the 4th switching tube Q4 is a NPN triode, and control terminal is NPN transistor base, and input is NPN triode
Colelctor electrode, and output end are NPN triode emitter stage；4th switching tube can also be NMOS FETs, then control terminal is
NMOS fet gates, input are NMOS FET drains, and output end is NMOS FET source electrodes.
Volume control circuit includes the 5th switching tube Q5, the 6th switching tube Q6, the 7th switching tube Q7, the 4th resistance R4, the
Five resistance R5, the 6th resistance R6, the 7th resistance R7 and the second electric capacity C2；5th switching tube input connection working power, the 5th
The 4th resistance R4 is connected between switching tube Q5 input and control terminal；And the 5th switching tube Q5 control terminal connection the 6th switch
Pipe Q6 input, the 6th switching tube Q6 output end connect the 7th switching tube Q7 input；7th switching tube Q7 output
End ground connection, the first control output end ctl1 of the 7th switching tube Q7 control terminal connection starting up's circuit；5th resistance R5's
First end connects the signal output part 1 of NFC module 11, and the 5th resistance R5 the second end connects the 6th resistance R6 first end, the
Six resistance R6 the second end ground connection, i.e. R5, R6 connect；Control terminal connection the 5th resistance R5 and the 6th resistance R6 of 6th switching tube
Connecting node at；5th switching tube Q5 output end connects the second electric capacity C2 positive pole, the second electric capacity C2 negative pole connection sound
Measure adjustment control port 16；Second electric capacity C2 negative pole connects the 7th resistance R7 over the ground.
Here, the 4th switching tube Q4, the 6th switching tube Q4 and the 7th switching tube Q7 are NPN triode, then control terminal is base
Pole, input is colelctor electrode, and output end is emitter stage；5th switching tube is PMOS FETs, and control terminal is grid, source
Extremely input, drain as output end.
Before start, the first control output end ctl1 of starting up's circuit is in high-impedance state, therefore the 4th switching tube Q4 is cut
Only, the 7th switching tube Q7 is also switched off；After NFC module 11 receives start-up command, first resistor R1 charges for the first electric capacity C1, after
And first switch pipe Q1 and second switch pipe Q2 is turned on, and so as to control starting up's circuit to start shooting, starting up's electricity after start
Road exports high level signal to the first control output end mouth ctl 1, and the signal received again from NFC module 11 afterwards can be held the 4th
Pipe Q4 conductings are closed, and then control circuit reception can not be switched on and off again, and are only received by volume control circuit, NFC power up functions are cut
It is changed to NFC volume adjusting functions.
After device power-up, the detection to volume adjusting control port 16 can be just performed, has detected whether that volume adjusting refers to
Order, i.e. the first control output end mouth ctl1 persistently receive high level signal, then the signal received from NFC module can be by the 4th switch
Pipe Q4 is turned on so that the signal that NFC module 11 receives can not be given to first switch pipe Q1 and second switch pipe Q2（Actually NFC
Module reception signal, it is most of to be guided by the 4th open pipe Q4, transmit the signal to first switch pipe Q1 and second switch pipe Q2
The state that can not make it that Q1 and Q2 is turned on is slackened）, meanwhile, NFC module 11 receive signal also through the 5th resistance R5 with
6th resistance R6 partial pressure（Value according to practical application setting the 5th resistance R5 and the 6th resistance R6）Reach the 6th switching tube Q6
Conducting voltage so that the 6th switching tube Q6 turn on, and then cause the 7th switching tube Q7 conducting, due to turned on the 7th switch
The output head grounding of pipe, so the 6th switching tube Q6 output end is also grounded, the 4th resistance R4 for then connecting its input
One end ground connection；This causes the 5th switching tube Q5 to meet turn-on condition and turn on that then working power VDD has been carried in the second electric capacity
On C2, the principle that can not be mutated according to electric capacity both end voltage, then the volume adjusting control port being connected with the second electric capacity C2 negative poles
16 voltage instantaneous is also changed into high level, is approximately equal to VDD, and the moment high level is caused volume adjusting instruction, high electric
Flat lasting effective time and the amplitude of high level are determined by the choosing value of the 7th resistance and the second electric capacity, for example, in equipment
It is required that being just considered high level when only signal is more than 0.8V, and require that high level lasting time is just considered effective for t
High level volume adjusting command signal, then the initial voltage VDD on the second electric capacity C2 pass through the 7th resistance R7 electric discharge, be reduced to
0.8V duration however less than require keep high level time t, could so produce an effective volume adjusting and refer to
Make signal.
The circuit, before start, volume control circuit shut-off, after power-up, starting up's circuit from its first control
The control signal of output port output processed starts isolation circuit work, and isolating the signal instruction that follow-up NFC module receives will not do
ON-OFF control circuit is disturbed, the switching of ON-OFF control circuit and volume control circuit is realized, avoids and interfere.
Simultaneously as only the 6th switching tube Q6 can just be turned on when the partial pressure on the 6th resistance R6 is more than 0.7V,
Voltage VIN caused by the trigger signal of NFC induction modules input is exported after the 5th resistance R5 and the 6th resistance R6 partial pressure
Voltage must be fulfilled for just can guarantee that the 6th switching tube Q6 conducting during VIN* [R6/ (R6+R5)] >=0.7V, and less than 0.7V
When, it can not turn on.Therefore, to the 5th resistance R5 and the 6th resistance R6 type selectings, the triggering that can set NFC volume adjustings is believed
Number sensitivity, so as to avoid due to caused by the false triggering of interference signal malfunction.
And the 7th resistance R7 and the second electric capacity C2 set in volume control circuit, it is in order to ensure, if be always maintained at
The near-field communication triggering filling of NFC module, the holding high level that volume adjusting control port will not continue, avoids continuing for volume
Regulation acts, because after the completion of C2 electric discharge, even if the triggering of near-field communication is also continuing, the volume control circuit can also close
It is disconnected.
The 5th switching tube Q5 purpose is added, is in order that when carrying out volume adjusting, no matter must pass through after powering
The instruction level that NFC module receives is how high, all without the voltage having influence on the second electric capacity C2, once ensure C2 and R7 and
After working power VDD pressure value is selected, the voltage on C2 is all approximate VDD definite value.
The embodiment of the present application also proposes a kind of NFC volume adjusting methods based on above-mentioned NFC volume control circuits, such as Fig. 4 institutes
Show, comprise the following steps：
Step S41：Start-up command is received from NFC module；
Under ideal case, equipment receives target device by NFC module with near-field communication modes（Or initiating equipment）
The start-up command of transmission, ON-OFF control circuit receive the start-up command from the NFC module of itself again.
Step S42：Start control signal is sent to starting up's circuit based on start-up command, to cause starting up's circuit
The first control signal is exported after powering；First control signal is used to start isolation circuit, so that isolation circuit isolates NFC moulds
The volume adjusting instruction that block receives is not switched on and off control circuit and received.
Starting up's circuit is started shooting control signal starting device according to caused by ON-OFF control circuit, and after powering from it
First control output end exports the first control signal to isolation circuit；After isolation circuit starts, by NFC module and switch control electricity
Road isolates, then the volume adjusting instruction for continuing through NFC module reception after powering is only received by volume control circuit.
Step S43：Adding deduct for control volume is instructed from NFC module volume of reception regulating command, and based on volume adjusting.
The volume adjusting instruction received again from NFC module after start, is received, and produce final sound by volume control circuit
Amount regulating command, which exports, gives volume adjusting control port, and the volume adjusting control port sends volume adjusting instruction to regulation
Circuit or chip of volume etc. realize the regulation to device voice volume.
The control to be added deduct for volume, a kind of specific embodiment is that volume is divided into n grade, often received once
A volume adjusting instruction volume of increase, until volume increases to maximum；And after volume adjusting to maximum, often receive a secondary noise
Measure regulating command and reduce a volume, until volume is decreased to minimum.Exemplified by 5, the order of volume adjusting is 1-2-3-4-
5-4-3-2-1, and often adjusting volume corresponding to one-level can set according to concrete application situation, this programme not limits.
Specific NFC volume adjusting methods have been described in detail based on above-mentioned NFC volume control circuits, and it will not go into details herein.
The NFC volume control circuits and NFC volume adjusting methods that the embodiment of the present application proposes, based on NFC boot-strap circuits, lead to
Cross and use isolation circuit and volume control circuit, after being started shooting in a manner of NFC, controlled NFC module and switch by isolation circuit
Circuit isolation processed, hereafter reuses the regulation of NFC module control device volume in a manner of near-field communication, can effectively reduce and set
Standby volume adjusting button, so as to simplify the configuration design of equipment.
It should be pointed out that it is limitation of the present invention that described above, which is not, the present invention is also not limited to the example above,
What those skilled in the art were made in the essential scope of the present invention changes, is modified, adds or replaces, and also should
Belong to protection scope of the present invention.
Claims (9)
1. NFC volume control circuits, including NFC module, it is characterised in that also including ON-OFF control circuit, starting up's electricity
Road, isolation circuit, volume control circuit and volume adjusting control port；Opened described in the signal output part connection of the NFC module
The input of control circuit is closed, the output end of the ON-OFF control circuit connects the input of starting up's circuit；It is described
First control output end of starting up's circuit connects the control signal of the isolation circuit；The isolation circuit is connected to institute
State between the signal output part of NFC module and the input of the ON-OFF control circuit；The input of the volume control circuit
The signal output part of the NFC module is connected, the output end of the volume control circuit connects the volume adjusting control port；
It is in series between the input of the signal output part of the NFC module and the ON-OFF control circuit by first resistor and the first electricity
Hold the charge-discharge circuit of composition；The first end of wherein described first resistor connects the signal output part of the NFC module, and described the
Second end of one resistance connects one end of first electric capacity all the way, and another way connects the input of the ON-OFF control circuit；
The other end ground connection of first electric capacity.
2. NFC volume control circuits according to claim 1, it is characterised in that the signal output part of the NFC module with
The first diode is in series between the input of the ON-OFF control circuit.
3. NFC volume control circuits according to claim 1, it is characterised in that the NFC volume control circuits also include
Working power；The ON-OFF control circuit includes first switch pipe, second switch pipe, the 8th resistance and the 9th resistance；Described
The control terminal of one switching tube and the control terminal of the second switch pipe all connect the signal output part of the NFC module；Described
The input of one switching tube and the second switch pipe all connects the working power；The output end of the first switch pipe is all the way
The first input end of starting up's circuit is connected, another way is grounded after connecting the 8th resistance；The second switch pipe
Output end connect the second input of starting up's circuit all the way, another way is grounded after connecting the 9th resistance.
4. NFC volume control circuits according to any one of claim 1 to 3, it is characterised in that the isolation circuit bag
Include the 3rd switching tube, second resistance and 3rd resistor；The first end of the second resistance connects the signal output of the NFC module
End, the second end of the second resistance connect the first end of the 3rd resistor, the second end ground connection of the 3rd resistor；It is described
First control output end of starting up's circuit connects the junction of the second resistance and the 3rd resistor；Described 3rd opens
The control terminal for closing pipe connects the first control output end of starting up's circuit, the input connection institute of the 3rd switching tube
The signal output part of NFC module is stated, the output end of the 3rd switching tube connects the input of the ON-OFF control circuit.
5. according to the NFC volume control circuits described in claim 3, it is characterised in that the isolation circuit is opened including the 4th
Guan Guan；The control terminal of 4th switching tube connects the first control output end of starting up's circuit, the 4th switch
The input of pipe connects the signal output part of the NFC module, the output head grounding of the 4th switching tube.
6. NFC volume control circuits according to claim 4, it is characterised in that the volume control circuit includes second
Diode and the 3rd diode；The signal output part of the positive pole connection NFC module of second diode, the described 2nd 2
The negative pole of pole pipe connects the positive pole of the 3rd diode, and the negative pole of the 3rd diode connects the volume adjusting control terminal
Mouthful.
7. NFC volume control circuits according to claim 5, it is characterised in that the volume control circuit includes the 5th
Switching tube, the 6th switching tube, the 7th switching tube, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the second electric capacity；Institute
State the 5th switching tube input and connect the working power, between the input and control terminal of the 5th switching tube described in connection
4th resistance；And the control terminal of the 5th switching tube connects the input of the 6th switching tube, the 6th switching tube
Output end connects the input of the 7th switching tube；The output head grounding of 7th switching tube, the 7th switching tube
Control terminal connects the first control output end of starting up's circuit；The first end of 5th resistance connects the NFC moulds
The signal output part of block, the second end of the 5th resistance connect the first end of the 6th resistance, and the of the 6th resistance
Two ends are grounded；The control terminal of 6th switching tube connects the junction of the 5th resistance and the 6th resistance；Described
The output end of five switching tubes connects the positive pole of second electric capacity, and the negative pole of second electric capacity connects the volume adjusting control
Port；The negative pole of second electric capacity connects the 7th resistance over the ground.
8. a kind of NFC using any one of claim 1 to 7 adjusts the NFC volume adjusting methods of circuit, its feature exists
In, including：
Start-up command is received from NFC module；
Start control signal is sent to starting up's circuit based on the start-up command, to cause starting up's circuit opening
The first control signal is exported after machine；First control signal is used to start isolation circuit, so that the isolation circuit prevents institute
The volume adjusting instruction for stating NFC module receipt of subsequent is received by the ON-OFF control circuit；
Adding deduct for control volume is instructed from the NFC module volume of reception regulating command, and based on the volume adjusting.
9. NFC volume adjusting methods according to claim 8, it is characterised in that adding deduct for the control volume is specific
For：
A volume adjusting instruction volume of increase is often received, until volume increases to maximum；
And after volume adjusting to maximum, often receive a volume adjusting instruction and reduce a volume, until volume is decreased to most
It is small.
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| CN201410834059.0A CN104486672B (en) | 2014-12-30 | 2014-12-30 | NFC volume control circuits and NFC volume adjusting methods |
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| CN201410834059.0A CN104486672B (en) | 2014-12-30 | 2014-12-30 | NFC volume control circuits and NFC volume adjusting methods |
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| CN104486672B true CN104486672B (en) | 2017-12-19 |
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| CN114416127A (en) * | 2020-10-09 | 2022-04-29 | 北京小米移动软件有限公司 | Terminal software upgrading method, terminal software upgrading device and storage medium |
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