CN105792073B - External audio device and audio-frequency processing method - Google Patents
External audio device and audio-frequency processing method Download PDFInfo
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- CN105792073B CN105792073B CN201610192866.6A CN201610192866A CN105792073B CN 105792073 B CN105792073 B CN 105792073B CN 201610192866 A CN201610192866 A CN 201610192866A CN 105792073 B CN105792073 B CN 105792073B
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/01—Input selection or mixing for amplifiers or loudspeakers
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- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of external audio devices, it include: five-part form earphone socket, five-part form connecting line component and audio component, audio component includes the ambipolar input operational amplifier of binary channels, first low noise operational amplifier, second low noise operational amplifier and feedback operational amplifier, the first input end of the ambipolar input operational amplifier of binary channels is connected with five-part form connecting line component, second input terminal is connected with the output end of feedback operational amplifier, first output end is connected with the first low noise operational amplifier, second output terminal is connected with the input terminal of the second low noise operational amplifier；The output end of first low noise operational amplifier and the second low noise operational amplifier is connected with the input terminal of feedback operational amplifier, and the output end of the first low noise operational amplifier and the second low noise operational amplifier is also connected with five-part form earphone socket.The present invention also provides a kind of audio-frequency processing method, the present invention is small in size and can be improved mobile terminal output sound quality.
Description
Technical field
The present invention relates to multimedia technology field more particularly to a kind of external audio devices and audio-frequency processing method.
Background technique
With the raising of modern standard of living, the mobile terminals such as smart phone, PAD (tablet computer) have been in life
Necessity, user listen to music commonly using these mobile terminals.However mobile terminal is due to volume, power supply and cost etc.,
The sound quality exported often through Codec and operational amplifier circuit is poor.
Existing external Hifi ear puts device on the market at present, and volume is larger, at high cost, and inconvenience uses.
Summary of the invention
It is a primary object of the present invention to propose a kind of external audio device and audio-frequency processing method, it is intended to reduce external sound
Imitate the volume of device.
To achieve the above object, a kind of mobile terminal provided by the invention, the external audio device include: five-part form ear
Machine transplanting of rice seat, five-part form connecting line component and the audio between the five-part form earphone socket and five-part form connecting line component
Component,
The audio component includes the ambipolar input operational amplifier of binary channels, the first low noise operational amplifier, second
Low noise operational amplifier and feedback operational amplifier, the first input end of the ambipolar input operational amplifier of binary channels with
The five-part form connecting line component is connected, and the second input terminal is connected with the output end of the feedback operational amplifier, the first output
End is connected with first low noise operational amplifier, the input terminal of second output terminal and second low noise operational amplifier
It is connected；
The output end of first low noise operational amplifier and the second low noise operational amplifier is transported with the feedback
The input terminal for calculating amplifier is connected, and the output end of first low noise operational amplifier and the second low noise operational amplifier is also
It is connected with the five-part form earphone socket.
Optionally, the audio component further includes switch, and the switch is connected to first low noise operational amplifier
And second low noise operational amplifier output end and the five-part form earphone socket between.
Optionally, the five-part form connecting line component includes: header body,
The header body includes the first wheat set gradually along the header body top to the header body base portion
Gram wind end, L channel end, right channel end, common and second microphone end；
It is disposed adjacent in first microphone end, L channel end, right channel end, common and second microphone end
It is provided with dead ring between the two.
Optionally, the five-part form earphone socket includes: jack body, the jack being provided on the jack body, with
And it is fixed in the jack body and protrudes into the ground wire haptic element, L channel haptic element, right channel haptic element, the first Mike of the jack
Wind haptic element and second microphone haptic element.
Optionally, the external audio device further includes power module, for powering to the external audio device.It is described
Power module includes: battery, boost converter, voltage-stablizer and stabilized switch inverter,
The battery is connected with the input terminal of the boost converter, the output end of the boost converter and the pressure stabilizing
The input terminal of device, the input terminal of stabilized switch inverter are connected.
Optionally, the power module further includes the battery management being connected between the battery and the boost converter
Chip, for charging to the external audio device.
Optionally, the external audio device further includes processor and the display module that is connected with the processor, is used for
Show the electricity of the battery.
In addition, to achieve the above object, the present invention also provides a kind of audio-frequency processing methods, which comprises
Receive the audio that mobile terminal is sent；
By the ambipolar input operational amplifier of binary channels in audio component according to preset gain coefficient to the audio into
Row first order enhanced processing；
By the first low noise operational amplifier in the audio component and the second low noise operational amplifier to the sound
Frequency carries out second level enhanced processing, and exports；
The audio exported by second level enhanced processing is preset by feedback operational amplifier in the audio component
Gain coefficient.
Optionally, include: before described the step of receiving the audio that mobile terminal is sent
When external audio device is inserted into mobile terminal five-part form earphone socket, Xiang Suoshu mobile terminal sends letter of shaking hands
Number, so that the mobile terminal opens external power supply mode, to provide power supply to the external audio device；
When receiving the power supply that the mobile terminal provides, battery management chip pair in the external audio device is controlled
Battery charges in external audio device, and drives audio component in the external audio device.
Optionally, when being not received by the power supply that the mobile terminal provides, electricity in the external audio device is controlled
Pond drives the audio component.After audio component starting, switch conduction in the audio component is controlled, to export process
Audio after second enhanced processing.
The external audio device of the present invention includes: five-part form earphone socket, five-part form connecting line component and is located at described five
Audio component between segmentation earphone socket and five-part form connecting line component, the audio component include the ambipolar input of binary channels
Operational amplifier, the first low noise operational amplifier, the second low noise operational amplifier and feedback operational amplifier, the bilateral
The first input end of the ambipolar input operational amplifier in road is connected with the five-part form connecting line component, the second input terminal and described
The output end of feedback operational amplifier is connected, and the first output end is connected with first low noise operational amplifier, the second output
End is connected with the input terminal of second low noise operational amplifier；First low noise operational amplifier and the second low noise
The output end of operational amplifier is connected with the input terminal of the feedback operational amplifier, first low noise operational amplifier and
The output end of second low noise operational amplifier is also connected with the five-part form earphone socket.By the above-mentioned means, the present invention uses
In being connected between mobile terminal and earphone, it can be compatible with traditional three-stage and four-part form equipment, external audio device is even
Amplifier electricity when being connected between mobile terminal and earphone, inside the embedded analog switch device cutting mobile terminal of mobile terminal
Road directly outputs signal to external audio devices from what Codec was exported, is handled by the external audio device, improves sound
The sound quality of frequency；The configuration of the present invention is simple simultaneously, audio Primary Component is external, with make up the limitation due to size of mobile terminals with
And the limitation to audio peripheral resistance-capacitance circuit and chip, small volume can be easy to use.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of external one embodiment of audio device of the present invention；
Fig. 2 is a kind of structural schematic diagram of audio component in the external audio device of the present invention；
Fig. 3 is a kind of structural schematic diagram of five-part form connecting line component in the embodiment of the present invention；
Fig. 4 is a kind of electrical block diagram of five-part form earphone socket in the embodiment of the present invention；
Fig. 5 is another structural schematic diagram of audio component in the external audio device of the present invention；
Fig. 6 is a kind of circuit structure signal of power module, processor and display module in the external audio device of the present invention
Figure；
Fig. 7 is the flow diagram of audio-frequency processing method first embodiment of the present invention；
Fig. 8 is the flow diagram of audio-frequency processing method second embodiment of the present invention；
Fig. 9 is the flow diagram of audio-frequency processing method 3rd embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The mobile terminal of each embodiment of the present invention is realized in description with reference to the drawings.In subsequent description, use
For indicate element such as " module ", " component " or " unit " suffix only for being conducive to explanation of the invention, itself
There is no specific meanings.Therefore, " module " can be used mixedly with " component ".
Mobile terminal can be implemented in a variety of manners.For example, terminal described in the present invention may include such as moving
Phone, smart phone, laptop, digit broadcasting receiver, PDA (personal digital assistant), PAD (tablet computer), PMP
The mobile terminal of (portable media player), navigation mobile terminal etc. and such as number TV, desktop computer etc.
Fixed terminal.Hereinafter it is assumed that terminal is mobile terminal.However, it will be understood by those skilled in the art that in addition to being used in particular for
Except the element of mobile purpose, the construction of embodiment according to the present invention can also apply to the terminal of fixed type.
The present invention provides a kind of external audio device.
Referring to Fig.1, Fig. 1 is the structural schematic diagram of external one embodiment of audio device of the present invention.
In the present embodiment, which includes: five-part form earphone socket 100, five-part form connecting line component 200
And the audio component 300 between the five-part form earphone socket 100 and five-part form connecting line component 200.
Specifically, referring to Fig.2, audio component 300 includes the ambipolar input operational amplifier 310 of binary channels, the first low noise
Sound operational amplifier 320, the second low noise operational amplifier 330 and feedback operational amplifier 340, the binary channels are ambipolar defeated
The first input end for entering operational amplifier 310 is connected with the five-part form connecting line component 200, the second input terminal and the feedback
The output end of operational amplifier 340 is connected, and the first output end is connected with first low noise operational amplifier 320, and second is defeated
Outlet is connected with the input terminal of second low noise operational amplifier 330；First low noise operational amplifier 320 and
The output end of two low noise operational amplifiers 330 is connected with the input terminal of the feedback operational amplifier 340, and described first is low
The output end of noise operational amplifier 320 and the second low noise operational amplifier 330 also with 100 phase of the five-part form earphone socket
Even.The model OPA1612 of the ambipolar input operational amplifier 310 of binary channels in the present embodiment, the amplification of the first low noise operational
The model OPA1688 of device 320 and the second low noise operational amplifier 330, the model of feedback operational amplifier 340
OPA2727 can use each amplifier of other models in specific implementation according to actual needs.
OPA1612 can realize very low noise density (1.1nV/Hz) and ultra-low-distortion (0.000015%) in 1kHz.
OPA1612 is capable of providing rail-to-rail output of amplitude of oscillation in the range of apart from power rail 600mV under 2-k Ω load, this is helped
It is maximized in realization dynamic range.In addition, these devices also have ± 30mA high output driving ability.
OPA1688 belongs to SoundPlus 36V, single supply, low noise operational amplifier series, which can
The operation in the power range of+4.5V (± 2.25V) to+36V (± 18V).The high pressure audio operational of these newest supplements amplifies
Device and OPA16xx device are arranged in pairs or groups, and are provided extensive bandwidth, noise and power selection for user, be can satisfy various applications
It needs.OPA168x uses microencapsulated, and deviates, drifts about and quiescent current is lower.These devices also have high bandwidth,
It is quickly converted rate and High Output Current driving capability.Two-way and four tunnel version technical specifications having the same, can be farthest
Improve design flexibility.
OPA2727 can do DC servo, prevent output midpoint from having the drift of 1mV or so.
At runtime, which is connected between mobile terminal and earphone, the ambipolar input operation of binary channels
Amplifier 310 receives audio data by five-part form connecting line component 200, is handled according to feedback operational amplifier 340, point
It is transmitted separately to corresponding first low noise operational amplifier 320, the second low noise operational amplifier 330 for left and right acoustic channels, the
Output is to earphone after the completion of one low noise operational amplifier 320 and the processing of the second low noise operational amplifier 330, to improve sound
Matter.
The shape of the audio component is bar shaped in the present embodiment.It can be set to other shapes in specific implementation, such as
It is rectangular.
Specifically, refering to Fig. 3, five-part form connecting line component 200 includes: header body 210, and header body 210 includes edge
It is the first microphone end 211 that 210 top of header body is set gradually to the header body base portion, L channel end 212, right
Sound channel end 213, common 214 and second microphone end 215；First microphone end 211, L channel end 212, right channel
What is be disposed adjacent in end 213, common 214 and second microphone end 215 is provided with dead ring between the two.
Further, five-part form connecting line component 200 further include: the pedestal 220 being connected with the header body 210.Bottom
Then seat 220 is connected with the ambipolar input operational amplifier 310 of binary channels.Length in specific implementation to extend external audio device
Degree, can be connected between pedestal 220 and the ambipolar input operational amplifier 310 of binary channels by conducting wire.
Specifically, refering to Fig. 4, five-part form earphone socket 100 includes: jack body 110, is provided with the jack body
Jack 120 on 100, and it is fixed in the jack body 100 and protrudes into ground wire haptic element 111, the Zuo Sheng of the jack 120
Road haptic element 112, right channel haptic element 113, the first microphone haptic element 114 and second microphone haptic element 115.
When in use, the external audio device of the present invention is inserted into corresponding in mobile terminal by five-part form connecting line component 200
Earphone socket, in header body 210 each section in being inserted into the mobile terminal when five-part form socket 100, respectively with it is corresponding
Interconnecting piece contact, i.e., when header body 210 is inserted into the five-part form earphone socket of mobile terminal, in the header body 210
First microphone end 211 is contacted with the first microphone haptic element in five-part form earphone socket, L channel end in the header body 210
212 contact with L channel haptic element in five-part form earphone socket, right channel end 213 and five-part form earphone in the header body 210
Right channel haptic element contacts in socket, and common 214 connects with ground wire haptic element in five-part form earphone socket in the header body 210
It touches, right channel end 213 is contacted with right channel haptic element in five-part form earphone socket in the header body 210.To realize audio
Etc. data transmission.Those skilled in the art can know being distinguished as described four of the header body 210 and traditional four-part form plug
One end of segmentation is provided with 211 part of the first microphone end more, therefore heretofore described five-part form earphone socket can also be simultaneous
Hold the insertion of four-section type headset plug, since three-stage plug is similar with four-part form plug, traditional three-stage plug can also be compatible with
External equipment.Simultaneously because the pin of power supply is put least significant end by the present embodiment, it can when avoiding insertion earphone to a certain extent
The pop sound that can be generated, because he has been placed on least significant end, L channel and right channel have no chance to touch this in header body 210
A pin is avoided due to driving without pop sound caused by optimizing.When earphone is inserted into the external audio device, inserted on earphone
Head ontology is identical as each section connection of five-part form socket in the external audio device, and this is no longer going to repeat them.
In five-part form earphone socket described in specific implementation each interconnecting piece can not also structure as shown in Figure 2 arranged
Sequence, can be randomly ordered by each interconnecting piece, and the plug of the corresponding external equipment then needs to carry out corresponding sequence setting, than
If the five-part form earphone socket includes the second microphone haptic element successively to sort, ground wire haptic element, right channel haptic element, L channel touching
Foot and the first microphone haptic element, the first microphone haptic element are the opening for external equipment insertion.
Further, refering to Fig. 5, to eliminate in the pop sound for switching external audio device generation, the external audio device
Middle audio component 300 can also include: switch 350, and the switch is connected to first low noise operational amplifier 310 and the
Between the output end of two low noise operational amplifiers 320 and the five-part form earphone socket 100.
The external audio device is being closed, is first turning off the switch 350；The external audio device is being opened, it is rear to open switch
350, to eliminate in the pop sound for switching external audio device generation.
Further, refering to Fig. 6, for guarantee the present invention can normally implement and, on startup, external audio dress
It sets and needs additional voltage support, the external audio device further includes power module 400 in the present embodiment, for described external
Audio device power supply.
Specifically, power module 400 includes: battery 410, battery management chip 420, boost converter in the present embodiment
430, voltage-stablizer 440 and stabilized switch inverter 450, battery 410 are connected with battery management chip 420, battery management chip 420
Also it is connected with the input terminal of boost converter 430, output end and the input terminal of voltage-stablizer 440, the pressure stabilizing of boost converter 430 are opened
The input terminal for closing inverter 450 is connected.Be in the present embodiment reduce volume battery 410 be 500mA battery, battery management chip
420 be BQ2510x, and boost converter 430 is TPS61251, and voltage-stablizer 440 is TPS72750, and stabilized switch inverter 450 is
LM27761 can also use other models in specific implementation, naturally it is also possible to be supplied by other common power supply circuits
Electricity.
When external audio device is connected to mobile terminal, power module gives the external audio device power supply, guarantees that this is outer
Set audio device normal work.In specific implementation, if the mobile terminal of the external audio device connection is that can provide additional electric
The mobile terminal in source, then mobile terminal when detecting that external audio device is connected to mobile terminal, open additional by mobile terminal
Power supply by the circuit be external audio device power supply, to guarantee that the external audio device has additional voltage support, from
And it works normally.
Further, battery management chip 420, for charging to the external audio device.
If the mobile terminal of connection has additional power supply, battery management chip 420 can also be to battery 410
It charges.To guarantee that external audio device when connecting the mobile terminal without additional power supply, can work independently.
Further, the external audio device further includes processor 500 and the display module that is connected with the processor
600, display module 600 is used to show the electricity of the battery.To reduce volume in the present embodiment, processor 500 is miniature place
Manage device MCU.
Further, the external audio device further includes power switch (not shown), power switch and 500 phase of processor
Even, it is opened and closed for controlling the external audio device.
Refering to Fig. 7, Fig. 7 is the flow diagram of audio-frequency processing method first embodiment of the present invention.
In the present embodiment, which includes:
Step S10 receives the audio that mobile terminal is sent；
The present invention is based on structures in above-described embodiment to realize.In external audio device insertion mobile terminal earphone socket
When, when mobile terminal detects the insertion of external audio device, the operational amplifier circuit inside the mobile terminal of port is directly defeated from Codec
Out output signal to external audio devices.External audio device receives what mobile terminal was sent by five-part form connecting line component
Audio.
Step S20, by the ambipolar input operational amplifier of binary channels in audio component according to preset gain coefficient to institute
It states audio and carries out first order enhanced processing；
The binary channels that the audio transmission received is connected into audio component with five-part form connecting line component is ambipolar defeated
Enter operational amplifier, the ambipolar input operational amplifier of binary channels carries out first to the audio received according to preset gain coefficient
Grade enhanced processing.
Step S30 passes through the first low noise operational amplifier and the second low noise operational amplifier in the audio component
Second level enhanced processing is carried out to the audio, and is exported；
After first order enhanced processing, by the audio component with the ambipolar input operational amplifier of binary channels
The first connected low noise operational amplifier of output end and the second low noise operational amplifier carry out the second level to the audio and put
Big processing, carries out the output of left and right acoustic channels by the first low noise operational amplifier and the second low noise operational amplifier respectively
Second level enhanced processing after the completion of processing, is exported to earphone, to improve sound quality.
Step S40, the audio exported by second level enhanced processing is by feedback operational amplifier in the audio component
Obtain preset gain coefficient.
To avoid in output that the audio exported by second level enhanced processing is being passed through audio component there are voltage drift
Middle feedback operational amplifier, feedback operational amplifier do DC servo according to the audio of output, obtain preset gain coefficient, transmission
To the ambipolar input operational amplifier of binary channels, to be adjusted in real time according to the audio of output.
The ambipolar input operational amplifier of binary channels uses the first low noise operational amplifier of OPA1612 in the present embodiment
320 and second low noise operational amplifier 330 model OPA1688, the model OPA2727 of feedback operational amplifier 340,
Each amplifier of other models can be used in specific implementation according to actual needs.OPA1612 can realize very low in 1kHz
Noise density (1.1nV/Hz) and ultra-low-distortion (0.000015%).OPA1612 2-k Ω load under be capable of providing the amplitude of oscillation away from
From the rail-to-rail output in the range of power rail 600mV, this helps to realize dynamic range maximization.In addition, these devices are also
With ± 30mA high output driving ability.OPA1688 belongs to SoundPlus 36V, single supply, low noise operational amplifier system
Column, the amplifier chain being capable of the operations in the power range of+4.5V (± 2.25V) to+36V (± 18V).These newest supplements
High pressure audio operational amplifier and OPA16xx device arrange in pairs or groups, provide extensive bandwidth, noise and power selection for user,
It can satisfy the needs of various applications.OPA168x uses microencapsulated, and deviates, drifts about and quiescent current is lower.These
Device also has high bandwidth, is quickly converted rate and High Output Current driving capability.Two-way and four tunnel version technologies having the same
Specification can farthest improve design flexibility.OPA2727 can do DC servo, prevent output midpoint from having 1mV's or so
Drift.
The external audio device of the present invention includes: five-part form earphone socket, five-part form connecting line component and is located at described five
Audio component between segmentation earphone socket and five-part form connecting line component, the audio component include the ambipolar input of binary channels
Operational amplifier, the first low noise operational amplifier, the second low noise operational amplifier and feedback operational amplifier, the bilateral
The first input end of the ambipolar input operational amplifier in road is connected with the five-part form connecting line component, the second input terminal and described
The output end of feedback operational amplifier is connected, and the first output end is connected with first low noise operational amplifier, the second output
End is connected with the input terminal of second low noise operational amplifier；First low noise operational amplifier and the second low noise
The output end of operational amplifier is connected with the input terminal of the feedback operational amplifier, first low noise operational amplifier and
The output end of second low noise operational amplifier is also connected with the five-part form earphone socket.By the above-mentioned means, the present invention uses
In being connected between mobile terminal and earphone, it can be compatible with traditional three-stage and four-part form equipment, external audio device is even
Amplifier electricity when being connected between mobile terminal and earphone, inside the embedded analog switch device cutting mobile terminal of mobile terminal
Road directly outputs signal to external audio devices from what Codec was exported, is handled by the external audio device, improves sound
The sound quality of frequency；The configuration of the present invention is simple simultaneously, audio Primary Component is external, with make up the limitation due to size of mobile terminals with
And the limitation to audio peripheral resistance-capacitance circuit and chip, small volume can be easy to use.
Refering to Fig. 8, Fig. 8 is the flow diagram of audio-frequency processing method second embodiment of the present invention.
In the present embodiment, which includes:
Step S50, when external audio device is inserted into mobile terminal five-part form earphone socket, Xiang Suoshu mobile terminal is sent
Handshake, so that the mobile terminal opens external power supply mode, to provide power supply to the external audio device；
To enable external audio device to operate normally, it is desirable to provide power supply supports audio assembly operating, the present embodiment
Middle mobile terminal has five-part form earphone socket, and mobile terminal can open external power supply mode, provides to external equipment additional
Power supply.User can open external audio device by the power key of external audio device, using electric in external audio device
Source is powered.If external audio device is opened, mobile terminal five-part form earphone socket can be inserted into external audio device
When, handshake is sent to mobile terminal, mobile terminal receives the handshake that external audio device is sent, according to what is received
Handshake opens external power supply mode, provides external power supply to external audio device.
Step S60 controls cell tube in the external audio device when receiving the power supply that the mobile terminal provides
Reason chip charges to battery in external audio device, and drives audio component in the external audio device.
If receiving the power supply of mobile terminal offer, battery management chip is controlled in external audio device to external sound
Battery charges in effect device, and audio component in the external audio device is driven to carry out after portion voltage is boosted
It works normally.
If mobile terminal can not open external power supply mode, the power supply of mobile terminal offer will not be received.?
When being not received by the power supply that the mobile terminal provides, controls battery in the external audio device and drive the audio group
Part.
Step S10 receives the audio that mobile terminal is sent；
When in external audio device insertion mobile terminal earphone socket, mobile terminal detects external audio device insertion
When, the operational amplifier circuit inside the mobile terminal of port directly outputs signal to external audio devices from what Codec was exported.External sound
It imitates device and the audio that mobile terminal is sent is received by five-part form connecting line component.
Step S20, by the ambipolar input operational amplifier of binary channels in audio component to the audio and preset gain
Coefficient carries out first order enhanced processing；
The binary channels that the audio transmission received is connected into audio component with five-part form connecting line component is ambipolar defeated
Enter operational amplifier, the ambipolar input operational amplifier of binary channels carries out first to the audio received according to preset gain coefficient
Grade enhanced processing.
Step S30 passes through the first low noise operational amplifier and the second low noise operational amplifier in the audio component
Second level enhanced processing is carried out to the audio, and is exported；
After first order enhanced processing, by the audio component with the ambipolar input operational amplifier of binary channels
The first connected low noise operational amplifier of output end and the second low noise operational amplifier carry out the second level to the audio and put
Big processing, carries out the output of left and right acoustic channels by the first low noise operational amplifier and the second low noise operational amplifier respectively
Second level enhanced processing after the completion of processing, is exported to earphone, to improve sound quality.
Step S40, the audio exported by second level enhanced processing is by feedback operational amplifier in the audio component
Obtain preset gain coefficient.
To avoid in output that the audio exported by second level enhanced processing is being passed through audio component there are voltage drift
Middle feedback operational amplifier, feedback operational amplifier do DC servo according to the audio of output, obtain preset gain coefficient, transmission
To the ambipolar input operational amplifier of binary channels, to be adjusted in real time according to the audio of output.
The ambipolar input operational amplifier of binary channels uses the first low noise operational amplifier of OPA1612 in the present embodiment
320 and second low noise operational amplifier 330 model OPA1688, the model OPA2727 of feedback operational amplifier 340,
Each amplifier of other models can be used in specific implementation according to actual needs.OPA1612 can realize very low in 1kHz
Noise density (1.1nV/Hz) and ultra-low-distortion (0.000015%).OPA1612 2-k Ω load under be capable of providing the amplitude of oscillation away from
From the rail-to-rail output in the range of power rail 600mV, this helps to realize dynamic range maximization.In addition, these devices are also
With ± 30mA high output driving ability.OPA1688 belongs to SoundPlus 36V, single supply, low noise operational amplifier system
Column, the amplifier chain being capable of the operations in the power range of+4.5V (± 2.25V) to+36V (± 18V).These newest supplements
High pressure audio operational amplifier and OPA16xx device arrange in pairs or groups, provide extensive bandwidth, noise and power selection for user,
It can satisfy the needs of various applications.OPA168x uses microencapsulated, and deviates, drifts about and quiescent current is lower.These
Device also has high bandwidth, is quickly converted rate and High Output Current driving capability.Two-way and four tunnel version technologies having the same
Specification can farthest improve design flexibility.OPA2727 can do DC servo, prevent output midpoint from having 1mV's or so
Drift.
Refering to Fig. 9, Fig. 9 is the flow diagram of audio-frequency processing method 3rd embodiment of the present invention.
In the present embodiment, which includes:
Step S50, when external audio device is inserted into mobile terminal five-part form earphone socket, Xiang Suoshu mobile terminal is sent
Handshake, so that the mobile terminal opens external power supply mode, to provide power supply to the external audio device；
To enable external audio device to operate normally, it is desirable to provide power supply supports audio assembly operating, the present embodiment
Middle mobile terminal has five-part form earphone socket, and mobile terminal can open external power supply mode, provides to external equipment additional
Power supply.User can open external audio device by the power key of external audio device, using electric in external audio device
Source is powered.If external audio device is opened, mobile terminal five-part form earphone socket can be inserted into external audio device
When, handshake is sent to mobile terminal, mobile terminal receives the handshake that external audio device is sent, according to what is received
Handshake opens external power supply mode, provides external power supply to external audio device.
Step S60 controls cell tube in the external audio device when receiving the power supply that the mobile terminal provides
Reason chip charges to battery in external audio device, and drives audio component in the external audio device.
If receiving the power supply of mobile terminal offer, battery management chip is controlled in external audio device to external sound
Battery charges in effect device, and audio component in the external audio device is driven to carry out after portion voltage is boosted
It works normally.
If mobile terminal can not open external power supply mode, the power supply of mobile terminal offer will not be received.?
When being not received by the power supply that the mobile terminal provides, controls battery in the external audio device and drive the audio group
Part.
Step S10 receives the audio that mobile terminal is sent；
When in external audio device insertion mobile terminal earphone socket, mobile terminal detects external audio device insertion
When, the operational amplifier circuit inside the mobile terminal of port directly outputs signal to external audio devices from what Codec was exported.External sound
It imitates device and the audio that mobile terminal is sent is received by five-part form connecting line component.
Step S20, by the ambipolar input operational amplifier of binary channels in audio component to the audio and preset gain
Coefficient carries out first order enhanced processing；
The binary channels that the audio transmission received is connected into audio component with five-part form connecting line component is ambipolar defeated
Enter operational amplifier, the ambipolar input operational amplifier of binary channels carries out first to the audio received according to preset gain coefficient
Grade enhanced processing.
Step S30 passes through the first low noise operational amplifier and the second low noise operational amplifier in the audio component
Second level enhanced processing is carried out to the audio, and is exported；
After first order enhanced processing, by the audio component with the ambipolar input operational amplifier of binary channels
The first connected low noise operational amplifier of output end and the second low noise operational amplifier carry out the second level to the audio and put
Big processing, carries out the output of left and right acoustic channels by the first low noise operational amplifier and the second low noise operational amplifier respectively
Second level enhanced processing after the completion of processing, is exported to earphone, to improve sound quality.
Step S40, the audio exported by second level enhanced processing is by feedback operational amplifier in the audio component
Obtain preset gain coefficient.
To avoid in output that the audio exported by second level enhanced processing is being passed through audio component there are voltage drift
Middle feedback operational amplifier, feedback operational amplifier do DC servo according to the audio of output, obtain preset gain coefficient, transmission
To the ambipolar input operational amplifier of binary channels, to be adjusted in real time according to the audio of output.
The ambipolar input operational amplifier of binary channels uses the first low noise operational amplifier of OPA1612 in the present embodiment
320 and second low noise operational amplifier 330 model OPA1688, the model OPA2727 of feedback operational amplifier 340,
Each amplifier of other models can be used in specific implementation according to actual needs.OPA1612 can realize very low in 1kHz
Noise density (1.1nV/Hz) and ultra-low-distortion (0.000015%).OPA1612 2-k Ω load under be capable of providing the amplitude of oscillation away from
From the rail-to-rail output in the range of power rail 600mV, this helps to realize dynamic range maximization.In addition, these devices are also
With ± 30mA high output driving ability.OPA1688 belongs to SoundPlus 36V, single supply, low noise operational amplifier system
Column, the amplifier chain being capable of the operations in the power range of+4.5V (± 2.25V) to+36V (± 18V).These newest supplements
High pressure audio operational amplifier and OPA16xx device arrange in pairs or groups, provide extensive bandwidth, noise and power selection for user,
It can satisfy the needs of various applications.OPA168x uses microencapsulated, and deviates, drifts about and quiescent current is lower.These
Device also has high bandwidth, is quickly converted rate and High Output Current driving capability.Two-way and four tunnel version technologies having the same
Specification can farthest improve design flexibility.OPA2727 can do DC servo, prevent output midpoint from having 1mV's or so
Drift.
Step S70 controls switch conduction in the audio component after audio component starting, with output by the
Audio after two enhanced processings.
When external audio device opens and closes, pop sound can be generated, for the influence for eliminating pop sound, this step can be
It executes, can also execute after the step s 40, naturally it is also possible to be executed after other steps before step S50.In external sound
After imitating device unlatching, switch conduction in the audio component is controlled, so that the audio after the second enhanced processing, can export
Into the earphone being connected with external audio device；Before the closing of external audio device, controls to switch in the audio component and close,
To eliminate pop sound.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of external audio device, which is characterized in that the external audio device includes: five-part form earphone socket, five-part form
Connecting line component and the audio component between the five-part form earphone socket and five-part form connecting line component,
The audio component includes the ambipolar input operational amplifier of binary channels, the first low noise operational amplifier, the second low noise
Sound operational amplifier and feedback operational amplifier, the first input end of the ambipolar input operational amplifier of binary channels with it is described
Five-part form connecting line component be connected, the second input terminal is connected with the output end of the feedback operational amplifier, the first output end and
First low noise operational amplifier is connected, the input terminal phase of second output terminal and second low noise operational amplifier
Even；
The output end of first low noise operational amplifier and the second low noise operational amplifier is put with the feedback op
The input terminal of big device is connected, the output end of first low noise operational amplifier and the second low noise operational amplifier also with institute
Five-part form earphone socket is stated to be connected.
2. external audio device as described in claim 1, which is characterized in that the audio component further includes switch, described to open
Connection is connected to the output end and the five-part form ear of first low noise operational amplifier and the second low noise operational amplifier
Between machine transplanting of rice seat.
3. external audio device as described in claim 1, which is characterized in that the five-part form connecting line component includes: plug
Ontology,
The header body includes the first microphone set gradually along the header body top to the header body base portion
End, L channel end, right channel end, common and second microphone end；
The two being disposed adjacent in first microphone end, L channel end, right channel end, common and second microphone end
Between be provided with dead ring.
4. external audio device as described in claim 1, which is characterized in that the five-part form earphone socket includes: socket sheet
Body, the jack being provided on the jack body, and it is fixed in the jack body and protrudes into the ground wire touching of the jack
Foot, L channel haptic element, right channel haptic element, the first microphone haptic element and second microphone haptic element.
5. external audio device as described in claim 1, which is characterized in that the external audio device further includes power supply mould
Block, for powering to the external audio device, the power module includes that battery, boost converter, voltage-stablizer and pressure stabilizing are opened
Close inverter, the battery is connected with the input terminal of the boost converter, the output end of the boost converter with it is described surely
The input terminal of depressor, the input terminal of stabilized switch inverter are connected.
6. external audio device as claimed in claim 5, which is characterized in that the power module further includes being connected to the electricity
Battery management chip between pond and the boost converter, for charging to the external audio device.
7. external audio device as claimed in claim 5, which is characterized in that the external audio device further include processor and
The display module being connected with the processor, the display module are used to show the electricity of the battery.
8. a kind of audio-frequency processing method, which is characterized in that the described method includes:
Receive the audio that mobile terminal is sent；
The is carried out to the audio according to preset gain coefficient by the ambipolar input operational amplifier of binary channels in audio component
Level-one enhanced processing；
By the first low noise operational amplifier in the audio component and the second low noise operational amplifier to the audio into
Row second level enhanced processing, and export；
Preset gain is obtained by feedback operational amplifier in the audio component by the audio that second level enhanced processing exports
Coefficient, and the preset gain coefficient is transmitted to by the ambipolar input operation of the binary channels by the feedback operational amplifier
Amplifier.
9. method according to claim 8, which is characterized in that wrapped before described the step of receiving the audio that mobile terminal is sent
It includes:
When external audio device is inserted into mobile terminal five-part form earphone socket, Xiang Suoshu mobile terminal sends handshake, with
So that the mobile terminal opens external power supply mode, to provide power supply to the external audio device；
When receiving the power supply that the mobile terminal provides, battery management chip is to external in the control external audio device
Battery charges in audio device, and drives audio component in the external audio device.
10. method as claimed in claim 9, which is characterized in that the method also includes:
When being not received by the power supply that the mobile terminal provides, controls battery in the external audio device and drive the sound
Component is imitated, after audio component starting, controls switch conduction in the audio component, the second enhanced processing is passed through with output
Audio afterwards.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192866.6A CN105792073B (en) | 2016-03-30 | 2016-03-30 | External audio device and audio-frequency processing method |
Applications Claiming Priority (1)
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|---|---|---|---|
| CN201610192866.6A CN105792073B (en) | 2016-03-30 | 2016-03-30 | External audio device and audio-frequency processing method |
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| CN105792073B true CN105792073B (en) | 2019-03-12 |
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| CN110505548B (en) * | 2019-07-22 | 2021-05-04 | 李群如 | Multifunctional wireless Bluetooth earphone |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202019436U (en) * | 2011-02-23 | 2011-10-26 | 常州美欧电子有限公司 | Earphone component |
| EP2648338A1 (en) * | 2012-04-02 | 2013-10-09 | Harman Becker Automotive Systems GmbH | Automatic Mono/Stereo Switch |
| CN203352755U (en) * | 2013-05-30 | 2013-12-18 | 安百特半导体有限公司 | Earphone plug adapter |
| CN103686509A (en) * | 2012-09-07 | 2014-03-26 | 美国博通公司 | Low-quiescent current headset driver |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1759561A4 (en) * | 2004-01-08 | 2010-07-21 | Aerielle Inc | Headphone receiver apparatus for use with low power transmitters |
| US9131296B2 (en) * | 2011-09-19 | 2015-09-08 | Apple Inc. | Auto-configuring audio output for audio performance and fault detection |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202019436U (en) * | 2011-02-23 | 2011-10-26 | 常州美欧电子有限公司 | Earphone component |
| EP2648338A1 (en) * | 2012-04-02 | 2013-10-09 | Harman Becker Automotive Systems GmbH | Automatic Mono/Stereo Switch |
| CN103686509A (en) * | 2012-09-07 | 2014-03-26 | 美国博通公司 | Low-quiescent current headset driver |
| CN203352755U (en) * | 2013-05-30 | 2013-12-18 | 安百特半导体有限公司 | Earphone plug adapter |
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