CN110351632A - A kind of microphone and audio input interface adaptive circuit - Google Patents
A kind of microphone and audio input interface adaptive circuit Download PDFInfo
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- CN110351632A CN110351632A CN201910714872.7A CN201910714872A CN110351632A CN 110351632 A CN110351632 A CN 110351632A CN 201910714872 A CN201910714872 A CN 201910714872A CN 110351632 A CN110351632 A CN 110351632A
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- 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
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Abstract
Of the invention a kind of microphone and audio input interface adaptive circuit, belong to microphone and audio input interface technical field.Bias voltage is provided to interface module by the electret bias supply one using Electret condenser microphone, it is inserted into after interface module according to the plug of different interface type, the bias voltage position difference that can be generated due to two of them terminal is different with earthing position and generates the different logic control voltage of two height, integrated circuit modules go switching voice-grade channel progress microphone and audio input interface adaptive according to the height difference of logic control voltage, it applies in the equipment for needing audio input, in particular for the audio frequency apparatus of microphone input or stereo audio input, realize the purpose that a variety of input equipments can be only adapted to an interface；Multiple interfaces are substituted with an interface, effectively reduce interface quantity, to small product size is reduced, simplifies design and plays positive effect.
Description
Technical field
The invention belongs to microphone and audio input interface technical field, specifically a kind of microphone and audio input interface
Adaptive circuit.
Background technique
Many audio (sound equipment) product, especially portable audio products, all have audio input interface, including electret
Microphone input interface, stereo audio signal input interface are also to stay there are also being exactly microphone above the earphone of conversing of mobile phone
Electret microphone input interface.These interfaces all use 3.5mm plug to be attached it, and corresponding is the earphone socket of 3.5mm.
Portable product may be difficult to be equipped with multiple interfaces simultaneously often due to structure size limitation, therefore the mode of input interface multiplexing
It is a kind of reasonable solution route of comparison.
Traditional earphone interface also has as output interface using adaptive multiplex mode.Utilize the difference of distinct interface
Impedance variations are given programmable control chip (mostly single-chip microcontroller etc.) and are handled, then produce to acquire input interface classification information
Raw control signal removes control switching switch, to achieve the purpose that switching.This kind of interface is mostly for microphone input and stereo audio
Stereo audio input matching is not done in output multiplexing.Furthermore the addition for controlling chip, increases the material cost of product.Because
Control chip, which generally requires, to be programmed and burning program, and design difficulty and production cost are increased.And in certain occasions, control
The addition of chip virtually also increases the volume of product.
Summary of the invention
1. technical problems to be solved by the inivention
It is at high cost it is an object of the invention to solve existing adaptive earphone to be handled by programmable control chip
And the problem bad to input equipment applicability.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
Of the invention a kind of microphone and audio input interface adaptive circuit, including audio circuit module, integrated circuit die
Block, audio amplification and matching module, capacitance module, control voltage filter module, bias supply module, interface module and microphone are put
Greatly and matching module, the interface module is four foot audio input interfaces, the four feet audio input interface include first terminal,
Second terminal, third terminal and forth terminal, the capacitance module be multiple coupled capacitors, the first terminal simultaneously with biasing
Power module, capacitance module, control voltage filter module connection, the first terminal are electric with first in capacitance module respectively
Appearance, third capacitor and the 5th capacitance connection；The second capacitance connection in the Second terminal and capacitance module, the third terminal
Ground connection, the forth terminal are connect with bias supply module, capacitance module, control voltage filter module simultaneously, the 4th end
Son respectively with the 4th capacitor and the 6th capacitance connection in capacitance module, audio amplification and matching module and microphone amplification with
Matching module is in parallel, and the audio amplification and matching module are set between integrated circuit modules and capacitance module, the microphone
Amplification and matching module are set between integrated circuit modules and capacitance module.
Preferably, the control voltage filter module includes first resistor and second resistance, the first resistor and integrated
The chip A pin serial connection of circuit module, and it is parallel with the 7th over the ground between first resistor and the chip A pin of integrated circuit modules
The chip B pin serial connection of capacitor, the second resistance and integrated circuit modules, and the core of upper second resistance and integrated circuit modules
Be parallel with the 8th capacitor between piece B pin over the ground, the bias supply module include electret bias supply one, 3rd resistor and
4th resistance, the 3rd resistor are connected with one anode of electret bias supply, and the 3rd resistor is connected with first resistor, institute
It states the 4th resistance to connect with one anode of electret bias supply, the 4th resistance is connected with second resistance.
Preferably, the audio amplification and matching module include operational amplifier, 10K Ohmic resistance one, 0K Ohmic resistance
The non-inverting input terminal of two and 100K Ohmic resistances, the operational amplifier is connected with the coupled capacitor inside capacitance module,
The non-inverting input terminal of the operational amplifier is grounded by 100K Ohmic resistance one, and the inverting input terminal of the operational amplifier is logical
The ground connection of 10K Ohmic resistance one is crossed, the output end of the operational amplifier is connected a 10K with the inverting input terminal of operational amplifier
Ohmic resistance two, the output end of the operational amplifier and the pin of integrated circuit modules connect,.
Preferably, the microphone amplification and matching module include electret bias supply two, 1K Ohmic resistance, 100K ohm
Resistance two and triode, the triode are connected between integrated circuit modules and coupled capacitor, the collector c of the triode
It connect with the chip pin of integrated circuit modules, connects between the collector c and electret bias supply two of the triode
One 1K Ohmic resistance, the emitter e ground connection of the triode, the base stage b of the triode are connected with coupled capacitor, and described three
The base stage b of pole pipe is connected with coupled capacitor, is also parallel with 100K between the base stage b of the triode and the collector c of triode
Ohmic resistance two.
Preferably, the integrated circuit modules select a cmos analog switch chip for double four, and described double four select a CMOS mould
Four groups of IN pins of quasi- switch chip wherein one group amplify with audio and connect with matching module, described pair four is selected CMOS simulation
Four groups of IN pins of switch chip wherein three groups and microphone amplification connect with matching module.
Preferably, the interface module is using canister portion point if CTIA standard cell phone earphone, when the interface module uses
Canister portion timesharing if OMTP standard cell phone earphone, forth terminal ground connection, the third terminal simultaneously with bias supply module,
Capacitance module, control voltage filter module connection, the third terminal respectively in capacitance module the 4th capacitor and the 6th electricity
Hold connection.
Preferably, described double four one group of OUT pin of a cmos analog switch chip is selected to connect with audio circuit module.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, have the following beneficial effects:
Of the invention a kind of microphone and audio input interface adaptive circuit, by inclined using the electret of Electret condenser microphone
It sets power supply one and provides bias voltage to interface module, after being inserted into interface module according to the plug of different interface type, due to the
The bias voltage position that one terminal, Second terminal, third terminal and forth terminal generate is different different with earthing position and generates
The different logic control voltage of two height, integrated circuit modules go switching audio logical according to the height difference of logic control voltage
Road carries out microphone and audio input interface is adaptive, applies in the equipment for needing audio input, in particular for microphone or stands
The audio frequency apparatus of body sound audio input, realizes the purpose that a variety of input equipments can be only adapted to an interface；It is connect with one
Mouth substitutes multiple interfaces, effectively reduces interface quantity, to small product size is reduced, simplifies design and plays positive effect；It is right
The adaptive adaptation of input equipment improves product practicability without to row manual control is switched into, simplifying the operation of product.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of of the invention a kind of microphone and audio input interface adaptive circuit；
Fig. 2 is the structural schematic diagram of audio amplification and matching module of the invention；
Fig. 3 is the structural schematic diagram of microphone amplification and matching module of the invention；
Fig. 4 is the logic switch figure of integrated circuit modules of the invention.
Label declaration in schematic diagram:
100, audio circuit module；200, integrated circuit modules；300, audio amplification and matching module；400, capacitor mould
Block；410, first capacitor；420, the second capacitor；430, third capacitor；440, the 4th capacitor；450, the 5th capacitor；460, the 6th
Capacitor；500, voltage filter module is controlled；510, first resistor；520, second resistance；530, the 7th capacitor；540, the 8th electricity
Hold；600, bias supply module；610,3rd resistor；620, the 4th resistance；700, interface module；710, first terminal；720,
Second terminal；730, third terminal；740, forth terminal；800, microphone amplification and matching module.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings, in attached drawing
Several embodiments of the invention are given, still, the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description, on the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to the disclosure.
It should be noted that it can directly on the other element when element is referred to as " being fixedly arranged on " another element
Or there may also be elements placed in the middle；When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements；Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement are for illustrative purposes only.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical；Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention；Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Embodiment 1
Referring to attached drawing 1- attached drawing 4, a kind of microphone and audio input interface adaptive circuit of the present embodiment, including audio-frequency electric
Road module 100, integrated circuit modules 200, audio amplification and matching module 300, capacitance module 400, control voltage filter module
500, bias supply module 600, interface module 700 and microphone amplification and matching module 800, the interface module 700 are four feet
Audio input interface, the four feet audio input interface include first terminal 710, Second terminal 720, third terminal 730 and
Four terminals 740, the capacitance module 400 are multiple coupled capacitors, the first terminal 710 simultaneously with bias supply module 600,
Capacitance module 400, control voltage filter module 500 connect, the first terminal 710 respectively with first in capacitance module 400
Capacitor 410, third capacitor 430 and the connection of the 5th capacitor 450；The Second terminal 720 and the second capacitor in capacitance module 400
420 connections, the third terminal 730 are grounded, the forth terminal 740 simultaneously with bias supply module 600, capacitance module 400,
Control voltage filter module 500 connect, the forth terminal 740 respectively with the 4th capacitor 440 and the 6th in capacitance module 400
Capacitor 460 connects, and, the audio amplification in parallel with matching module 800 is amplified in the audio amplification with matching module 300 with microphone
It is set between integrated circuit modules 200 and capacitance module 400 with matching module 300, the microphone amplification and matching module 800
It is set between integrated circuit modules 200 and capacitance module 400.
It includes first resistor 510 and second resistance 520 that the embodiment of the present invention, which controls voltage filter module 500, and described the
The chip A pin serial connection of one resistance 510 and integrated circuit modules 200, and the core of first resistor 510 and integrated circuit modules 200
The 7th capacitor 530, the chip B pin of the second resistance 520 and integrated circuit modules 200 are parallel between piece A pin over the ground
Series connection, and it is parallel with the 8th capacitor 540, institute over the ground between upper second resistance 520 and the chip B pin of integrated circuit modules 200
Stating bias supply module 600 includes electret bias supply one, 3rd resistor 610 and the 4th resistance 620, the 3rd resistor
610 connect with one anode of electret bias supply, and the 3rd resistor 610 is connected with first resistor 510, the 4th resistance
620 connect with one anode of electret bias supply, and the 4th resistance 620 is connected with second resistance 520.
The amplification of the embodiment of the present invention audio includes operational amplifier, 10K Ohmic resistance one, the Europe 0K with matching module 300
A nurse resistance two and 100K Ohmic resistance, the coupling of 400 the inside of non-inverting input terminal and capacitance module of the operational amplifier
Capacitor series connection, the non-inverting input terminal of the operational amplifier by the ground connection of 100K Ohmic resistance one, the operational amplifier it is anti-
Phase input terminal is grounded by 10K Ohmic resistance one, the output end of the operational amplifier and the inverting input terminal of operational amplifier
It connects a 10K Ohmic resistance two, the output end of the operational amplifier is connect with the pin of integrated circuit modules 200,.
The embodiment of the present invention microphone amplification with matching module 800 include electret bias supply two, 1K Ohmic resistance,
100K Ohmic resistance two and triode, the triode are connected between integrated circuit modules 200 and coupled capacitor, three pole
The collector c of pipe is connect with the chip pin of integrated circuit modules 200, the collector c and electret biased electrical of the triode
Connected between source two a 1K Ohmic resistance, the emitter e ground connection of the triode, the base stage b of the triode with couple
Capacitor is connected, and the base stage b of the triode is connected with coupled capacitor, the collector c of the base stage b of the triode and triode it
Between be also parallel with 100K Ohmic resistance two.
The embodiment of the present invention integrated circuit modules 200 select a cmos analog switch chip for double four, and described double four select one
Four groups of IN pins of cmos analog switch chip wherein one group amplify with audio and connect with matching module 300, described pair four is selected
Four groups of IN pins of one cmos analog switch chip wherein three groups and microphone amplification connect with matching module 800, utilize multi-pass
Logic control analog switch in road adds the way of switching circuit instead of traditional programmable control chip, due to not needing portable control
Processing procedure sequence eliminates programmable control chip, only can be realized with simple hardware circuit, and product cost is effectively reduced, and reduces
Product development difficulty shortens time of product development.
The present embodiment provides biased electrical to interface module 700 by the electret bias supply one using Electret condenser microphone
Pressure, after being inserted into interface module 700 according to the plug of different interface type, due to first terminal 710, Second terminal 720, third
Terminal 730 is different with earthing position with the bias voltage position difference of two generations in forth terminal 740 and generates two height
Low different logic control voltage, integrated circuit modules 200 remove switching voice-grade channel according to the height difference of logic control voltage
It carries out microphone and audio input interface is adaptive, apply in the equipment for needing audio input, in particular for microphone or solid
The audio frequency apparatus of sound audio input, realizes the purpose that a variety of input equipments can be only adapted to an interface；With an interface
Multiple interfaces are substituted, interface quantity is effectively reduced, to small product size is reduced, simplifies design and plays positive effect；To defeated
The adaptive adaptation for entering equipment improves product practicability without to row manual control is switched into, simplifying the operation of product.
Certain embodiment of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as；It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range；Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (7)
1. a kind of microphone and audio input interface adaptive circuit, it is characterised in that: including audio circuit module (100), integrate
Circuit module (200), audio amplification with matching module (300), capacitance module (400), control voltage filter module (500), partially
Power module (600), interface module (700) and microphone amplification and matching module (800) are set, the interface module (700) is four
Foot audio input interface, the four feet audio input interface include first terminal (710), Second terminal (720), third terminal
(730) and forth terminal (740), the capacitance module (400) is multiple coupled capacitors, the first terminal (710) simultaneously with
Bias supply module (600), capacitance module (400), control voltage filter module (500) connection, the first terminal (710) point
It is not connect with first capacitor (410), third capacitor (430) and the 5th capacitor (450) in capacitance module (400)；Described second
Terminal (720) is connect with the second capacitor (420) in capacitance module (400), third terminal (730) ground connection, and the described 4th
Terminal (740) is connect with bias supply module (600), capacitance module (400), control voltage filter module (500) simultaneously, described
Forth terminal (740) respectively in capacitance module (400) the 4th capacitor (440) and the 6th capacitor (460) connect, the audio
, the audio amplification and matching module (300) in parallel with matching module (800) are amplified in amplification with matching module (300) with microphone
It is set between integrated circuit modules (200) and capacitance module (400), the microphone amplification is set to matching module (800)
Between integrated circuit modules (200) and capacitance module (400).
2. a kind of microphone according to claim 1 and audio input interface adaptive circuit, it is characterised in that: the control
Voltage filter module (500) includes first resistor (510) and second resistance (520), the first resistor (510) and integrated circuit
The chip A pin serial connection of module (200), and it is right between first resistor (510) and the chip A pin of integrated circuit modules (200)
Ground is parallel with the 7th capacitor (530), the chip B pin serial connection of the second resistance (520) and integrated circuit modules (200), and
The 8th capacitor (540) is parallel between upper second resistance (520) and the chip B pin of integrated circuit modules (200) over the ground, it is described
Bias supply module (600) includes electret bias supply one, 3rd resistor (610) and the 4th resistance (620), the third electricity
Resistance (610) and electret bias supply one is positive to connect, and the 3rd resistor (610) is connected with first resistor (510), and described the
Four resistance (620) are connected with one anode of electret bias supply, and the 4th resistance (620) is connected with second resistance (520).
3. a kind of microphone according to claim 1 and audio input interface adaptive circuit, it is characterised in that: the audio
Amplification includes 100K ohm of operational amplifier, 10K Ohmic resistance one, a 0K Ohmic resistance two and electricity with matching module (300)
Resistance, the non-inverting input terminal of the operational amplifier are connected with the coupled capacitor inside capacitance module (400), the operational amplifier
Non-inverting input terminal be grounded by 100K Ohmic resistance one, the inverting input terminal of the operational amplifier passes through 10K Ohmic resistance
One ground connection, the output end of the operational amplifier are connected a 10K Ohmic resistance two with the inverting input terminal of operational amplifier, institute
The output end for stating operational amplifier is connect with the pin of integrated circuit modules (200).
4. a kind of microphone according to claim 1 and audio input interface adaptive circuit, it is characterised in that: the microphone
Amplification and matching module (800) include electret bias supply two, 1K Ohmic resistance, 100K Ohmic resistance two and triode, institute
It states triode to be connected between integrated circuit modules (200) and coupled capacitor, the collector c and integrated circuit die of the triode
The chip pin of block (200) connects, Europe 1K of having connected between the collector c and electret bias supply two of the triode
Nurse resistance, the emitter e ground connection of the triode, the base stage b of the triode are connected with coupled capacitor, the base of the triode
Pole b is connected with coupled capacitor, is also parallel with 100K Ohmic resistance between the base stage b of the triode and the collector c of triode
Two.
5. a kind of microphone according to claim 1 and audio input interface adaptive circuit, it is characterised in that: described integrated
Circuit module (200) selects a cmos analog switch chip for double four, and described double four select four groups of IN of a cmos analog switch chip
Pin wherein one group amplify with audio and connect with matching module (300), described pair four is selected the four of a cmos analog switch chip
Group IN pin wherein three groups and microphone amplification connect with matching module (800).
6. a kind of microphone according to claim 1 and audio input interface adaptive circuit, it is characterised in that: the interface
Module (700) uses canister portion point if CTIA standard cell phone earphone, when the interface module (700) use OMTP standard cell phone ear
Canister portion timesharing if machine, the forth terminal (740) ground connection, the third terminal (730) simultaneously with bias supply module
(600), capacitance module (400), control voltage filter module (500) connection, the third terminal (730) respectively with capacitance module
(400) the 4th capacitor (440) and the connection of the 6th capacitor (460) in.
7. a kind of microphone according to claim 5 and audio input interface adaptive circuit, it is characterised in that: described double four
One group of OUT pin of a cmos analog switch chip is selected to connect with audio circuit module (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910714872.7A CN110351632A (en) | 2019-08-02 | 2019-08-02 | A kind of microphone and audio input interface adaptive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910714872.7A CN110351632A (en) | 2019-08-02 | 2019-08-02 | A kind of microphone and audio input interface adaptive circuit |
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| CN110351632A true CN110351632A (en) | 2019-10-18 |
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| CN201910714872.7A Pending CN110351632A (en) | 2019-08-02 | 2019-08-02 | A kind of microphone and audio input interface adaptive circuit |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4182802B2 (en) * | 2003-04-25 | 2008-11-19 | ソニー株式会社 | Acoustic signal input / output device, input / output circuit switching method |
| CN201204638Y (en) * | 2007-01-05 | 2009-03-04 | 苹果公司 | System and single-pin plug |
| CN102053932A (en) * | 2009-10-29 | 2011-05-11 | 宏达国际电子股份有限公司 | Electronic device and method for identifying electronic accessory therein |
| CN102395069A (en) * | 2011-08-22 | 2012-03-28 | 华为终端有限公司 | Method for being compatible with earphones with different plug types, apparatus and terminal equipment |
| CN202551149U (en) * | 2012-03-09 | 2012-11-21 | 惠州Tcl移动通信有限公司 | Mobile terminal capable of adaptively detecting microphone of earphone |
| CN103002367A (en) * | 2011-09-14 | 2013-03-27 | 三星电子株式会社 | Mobile device for multi-channel sound collection and output using common connector, and driving method thereof |
| CN105247887A (en) * | 2013-06-07 | 2016-01-13 | 索尼公司 | Input device and transmission method; host device and reception method, and signal processing system and transmission/reception method |
| US9319768B2 (en) * | 2011-12-06 | 2016-04-19 | Conexant Systems, Inc. | Multi-standard headset support with integrated ground switching |
| CN107396251A (en) * | 2016-03-17 | 2017-11-24 | Ess技术有限公司 | Support the balance earphone in Mobile solution and the changeable quadrupole plug of headset operation |
-
2019
- 2019-08-02 CN CN201910714872.7A patent/CN110351632A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4182802B2 (en) * | 2003-04-25 | 2008-11-19 | ソニー株式会社 | Acoustic signal input / output device, input / output circuit switching method |
| CN201204638Y (en) * | 2007-01-05 | 2009-03-04 | 苹果公司 | System and single-pin plug |
| CN102053932A (en) * | 2009-10-29 | 2011-05-11 | 宏达国际电子股份有限公司 | Electronic device and method for identifying electronic accessory therein |
| CN102395069A (en) * | 2011-08-22 | 2012-03-28 | 华为终端有限公司 | Method for being compatible with earphones with different plug types, apparatus and terminal equipment |
| CN103002367A (en) * | 2011-09-14 | 2013-03-27 | 三星电子株式会社 | Mobile device for multi-channel sound collection and output using common connector, and driving method thereof |
| US9319768B2 (en) * | 2011-12-06 | 2016-04-19 | Conexant Systems, Inc. | Multi-standard headset support with integrated ground switching |
| CN202551149U (en) * | 2012-03-09 | 2012-11-21 | 惠州Tcl移动通信有限公司 | Mobile terminal capable of adaptively detecting microphone of earphone |
| CN105247887A (en) * | 2013-06-07 | 2016-01-13 | 索尼公司 | Input device and transmission method; host device and reception method, and signal processing system and transmission/reception method |
| CN107396251A (en) * | 2016-03-17 | 2017-11-24 | Ess技术有限公司 | Support the balance earphone in Mobile solution and the changeable quadrupole plug of headset operation |
Non-Patent Citations (1)
| Title |
|---|
| LEO LIU: "支持多按键线控耳机的音频插孔检测方案", 《世界电子元器件》 * |
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