CN207603866U - A kind of double working modes bluetooth headset Dolby circuit and bluetooth headset - Google Patents
A kind of double working modes bluetooth headset Dolby circuit and bluetooth headset Download PDFInfo
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- CN207603866U CN207603866U CN201721817714.7U CN201721817714U CN207603866U CN 207603866 U CN207603866 U CN 207603866U CN 201721817714 U CN201721817714 U CN 201721817714U CN 207603866 U CN207603866 U CN 207603866U
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Abstract
The utility model discloses a kind of double working modes bluetooth headset Dolby circuit and bluetooth headsets, including linear input circuit and microphone input circuit, electromagnetic interference suppression is connected between the ground wire terminal of the linear input circuit and the ground wire terminal of the microphone input circuit.The double working modes bluetooth headset Dolby circuit of the utility model, by setting electromagnetic interference suppression between the ground wire terminal of linear input circuit and the ground wire terminal of microphone input circuit, when can switch to wireless blue tooth answer mode in a state that audio connecting cord keeps connecting with external equipment, filter out the noise for the ground wire that microphone input circuit is transferred to by the ground wire of audio connecting cord, and then the noise signal of external equipment is prevented to be transferred to the microphone circuit of bluetooth headset by the ground wire of audio connecting cord, avoid the problem of decline of earphone call audio performance is caused due to external equipment noise.
Description
Technical field
The utility model is related to a kind of Dolby circuit, specifically, being to be related to a kind of double working modes bluetooth headset noise reduction
Circuit and bluetooth headset.
Background technology
The wireless Bluetooth headsets that the occasions such as routine office work, leisure are often used, headphone in order to be compatible with it is different should
Largely have bluetooth wireless connection with scene and tone frequency channel wire inputs two kinds of operating modes.During people's use, when from audio
When line input pattern is switched to bluetooth conversation pattern, custom is directly cut without being pulled out the audio connecting cord being connect with external equipment
Bluetooth is shifted to answer, the noise signal for being easy to cause external equipment is transmitted to the microphone circuit of bluetooth headset by tone frequency channel wire,
Cause the decline of earphone call audio performance, the noise signal generated when serious can generate the feeling for making us uncomfortable.
Invention content
The utility model is kept and outside to solve the wireless Bluetooth headsets of existing double working modes in audio connecting cord
When switching to wireless blue tooth answer mode in the state of equipment connection, the noise signal of external equipment is caused to be conducted by tone frequency channel wire
To the microphone input circuit of bluetooth headset, a kind of the problem of causing the decline of earphone call audio performance, it is proposed that double work
Mode Bluetooth earphone Dolby circuit, can solve the above problems.
In order to solve the above-mentioned technical problem, the utility model is achieved using following technical scheme：
A kind of double working modes bluetooth headset Dolby circuit, it is described including linear input circuit and microphone input circuit
The linear electromagnetic interference that is connected between the ground wire terminal of input circuit and the ground wire terminal of the microphone input circuit inhibits member
Part.
Further, the electromagnetic interference suppression is magnetic bead.
Further, analog switch is further included, the linear input circuit and the microphone input circuit connect respectively
The input terminal of the analog switch, the output terminal of the analog switch are connect with Bluetooth chip.
Further, the microphone input circuit includes the first filter circuit, and first filter circuit is connected to wheat
Gram between wind input terminal and the first input end of the analog switch.
Further, the microphone input circuit further includes radiofrequency signal suppression circuit, and the radiofrequency signal inhibits electricity
Road is connected between first filter circuit and the first input end of the analog switch.
Further, the radiofrequency signal suppression circuit includes the first inductance, and first inductance is connected on described first
Between the first input end of filter circuit and the analog switch.
Further, the first blocking electricity is also associated between first inductance and the first input end of the analog switch
Hold.
Further, the linear input circuit includes the second filter circuit and gain adjustment circuit, second filtering
Circuit and gain adjustment circuit are connected in series between linear input terminal and the second input terminal of the analog switch.
Further, second filter circuit includes the third capacitance and the 4th capacitance that are in parallel, the third capacitance
And the 4th one end of capacitance be connected between linear input terminal and the gain adjustment circuit, other end respectively with line
Property input circuit ground wire terminal connection.
Further, it is connected with the second blocking between the gain adjustment circuit and the second input terminal of the analog switch
Capacitance.
The utility model proposes a kind of bluetooth headset simultaneously, including above-mentioned Dolby circuit.
Compared with prior art, the advantages of the utility model and good effect is：The double working modes of the utility model are blue
Tooth earphone Dolby circuit, by being set between the ground wire terminal of linear input circuit and the ground wire terminal of microphone input circuit
Electromagnetic interference suppression can switch to wireless blue tooth in a state that audio connecting cord keeps connecting with external equipment and answer
During pattern, the noise for the ground wire that microphone input circuit is transferred to by the ground wire of audio connecting cord is filtered out, and then is prevented outer
The noise signal of portion's equipment is transferred to the microphone circuit of bluetooth headset by the ground wire of audio connecting cord, avoids due to outside
Noise of equipment causes the problem of decline of earphone call audio performance.
After the detailed description of the utility model embodiment is read in conjunction with the figure, other features and advantages of the utility model
It will become clearer.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of embodiment principle box for the double working modes bluetooth headset Dolby circuit that the utility model is proposed
Figure.
Fig. 2 is that a kind of embodiment circuit for the double working modes bluetooth headset Dolby circuit that the utility model is proposed is former
Reason figure；
Fig. 3 is microphone input circuit in the double working modes bluetooth headset Dolby circuit that the utility model is proposed
Local circuit schematic diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
Embodiment one keeps connecting with external equipment for the wireless Bluetooth headsets of current double working modes in audio connecting cord
When wireless blue tooth answer mode is switched in the state of connecing, the noise signal of external equipment is transmitted to bluetooth headset by tone frequency channel wire
Microphone circuit, cause earphone call audio performance decline the problem of, it has been investigated that, the noise signal of external equipment is led to
The ground wire for crossing audio connecting cord is transferred to bluetooth headset, in bluetooth headset internal circuit, the ground wire terminal of linear input circuit
It is to be connected with each other between the ground wire terminal of microphone input circuit, therefore, the ground that noise signal passes through linear input circuit
Line terminals are transferred to the ground wire terminal of microphone input circuit, if earphone is in wireless blue tooth answer mode at this time, introducing is made an uproar
Acoustical signal is transferred to Bluetooth chip with microphone input circuit, so cause earphone call audio performance decline, based on this,
The present embodiment proposes a kind of double working modes bluetooth headset Dolby circuit, as shown in Figure 1, including linear input circuit and Mike
Wind input circuit, the ground wire terminal Line IN of linear input circuit between the ground wire terminal MIC ground of microphone input circuit
It is connected with electromagnetic interference suppression.Wherein, linear input circuit is connect with audio connecting cord, for by the audio of external equipment
Signal is transferred to Bluetooth chip, and microphone input circuit is used for the audio signal transfer device Bluetooth chip for acquiring microphone,
This wireless Bluetooth headsets audio connecting cord holding connect with external equipment in the state of switch to wireless blue tooth answer mode when,
Electromagnetic interference suppression, which can be filtered out, to be transferred to the ground wire of microphone input circuit by the ground wire of audio connecting cord and makes an uproar
Sound, and then the noise signal of external equipment is prevented to be transferred to the microphone circuit of bluetooth headset by the ground wire of audio connecting cord,
Avoid the problem of decline of earphone call audio performance is caused due to external equipment noise.
External equipment passes through the radio noise that the noise signal that the ground wire of audio connecting cord transmits is usually high frequency, radio frequency energy
Amount is the AC sine wave component being superimposed upon on direct current transmission level, and RF energy is that useless electromagnetic interference is passed along circuit
Defeated and radiation, the electromagnetic interference suppression in the present embodiment preferably realize that the function of magnetic bead, which is mainly eliminated, deposits using magnetic bead
The radio noise being in transmission line, magnetic bead have very high resistivity and magnetic conductivity, are equivalent to resistance and inductance series connection, but electricity
Resistance value and inductance value all change with frequency.Magnetic bead has better High frequency filter characteristic than common inductance, and resistance is presented in high frequency
Property, so higher impedance can be kept in comparatively wide frequency range, so as to improve frequency modulation filter effect.Certainly, this implementation
Electromagnetic interference suppression in example is not limited to use the series circuit of equivalent resistance and inductance using magnetic bead realization
Or other equivalent circuits are realized.
Since the wireless Bluetooth headsets of the present embodiment can be operated in two kinds of audio communication modes of tone frequency channel wire and wireless blue tooth,
But synchronization can only operate under one of which operating mode, therefore, it is necessary to according to user demand in two kinds of operating modes
In switch over, the wireless Bluetooth headsets in the present embodiment further include analog switch, linear input circuit and microphone input electricity
Road connects the input terminal of analog switch respectively, and the output terminal of analog switch is connect with Bluetooth chip.Analog switch is used for switch line
Property input circuit and microphone input circuit respectively with the conducting state of Bluetooth chip.
As shown in Figure 1, microphone input circuit includes the first filter circuit, the first filter circuit is connected to microphone input
Between terminal and the first input end of analog switch, the first filter circuit is mainly used for filtering out signal collected by microphone
In low-frequency noise.
As shown in Figure 1, linear input circuit includes the second filter circuit and gain adjustment circuit, the second filter circuit and increasing
Beneficial adjustment circuit is connected in series between linear input terminal and the second input terminal of analog switch.Second filter circuit is used to filter
The low-frequency noise passed in external equipment by tone frequency channel wire, gain adjustment circuit are removed, gain adjustment circuit is used for line
Audio signal in property input circuit is amplified.
As a preferred embodiment, as shown in Fig. 2, the first filter circuit includes the first capacitance C1 being in parallel and the
One end of two capacitance C2, the first capacitance C1 and the second capacitance C2 is connected to microphone input terminal MIC1 and analog switch U1
First input end between, other end is connect respectively with the ground wire terminal of microphone input circuit.It is with dual microphone in Fig. 2
For illustrate, when using dual microphone MIC1 and MIC2 when, have two-way microphone circuit, each microphone correspond to one
Road microphone circuit, between the two-way microphone circuit independently of each other, and structure is identical, different from analog switch respectively to input
Terminal connects.
When wireless blue tooth answer mode is opened, the wireless blue tooth signal that wireless blue tooth radio-frequency module is emitted will be simultaneously
Signal in microphone input circuit is interfered, in order to filter out interference, the microphone input circuit of the present embodiment also wraps
Include radiofrequency signal suppression circuit, radiofrequency signal suppression circuit be connected to the first filter circuit and analog switch first input end it
Between, filter out the interference of 2.4GHz high-frequency signals that wireless blue tooth radio-frequency module is emitted.
Preferably, as shown in Fig. 2, radiofrequency signal suppression circuit is connected on described including the first inductance L1, the first inductance L1
Between first filter circuit and the first input end of analog switch.Relevant noise letter in circuit is filtered out by the first filter circuit
Number, the interference for the high-frequency signal that Bluetooth RF module emits then is filtered out by the first inductance L1 of concatenation.Bluetooth RF at present
Module generally emits the high-frequency signal of 2.4GHz, and the induction reactance of the first inductance of preferred value L1 is 15nH, can filter out Bluetooth RF electricity
The high-frequency interferencing signal of 2.4GHz in road.Certainly, the induction reactance of the first inductance L1 is not limited to above-mentioned value, can be according to actually required
The frequency setting for the high-frequency signal to be filtered out.
The first capacitance C5 is also associated between first inductance L1 and the first input end of analog switch, for filtering out
Direct current signal in microphone input circuit.
Audio connecting cord has two-way under normal circumstances, and the left and right two paths of audio connecting cord are respectively Line IN_L
Therefore input and Line IN_R inputs, have a linear input circuit of two-way, between each linear input circuit mutually solely
Vertical, structure is identical.As shown in Fig. 2, by taking the left channel of audio connecting cord as an example, the second filter circuit includes the third being in parallel electricity
The one end for holding C7 and the 4th capacitance C8, third capacitance C7 and the 4th capacitance C8 is connected to linear input terminal Line IN_L
Between input and gain adjustment circuit U1, ground wire terminal of the other end respectively with linear input circuit is connect.
The second capacitance C11 is connected between gain adjustment circuit and the second input terminal of analog switch U1, for filtering
Remove the direct current signal in linear input circuit.
Analog switch U1 controls the switching of microphone and Line IN audio signals by the level signal of input terminal IN,
When input is high level 1, the audio signal of corresponding NO channels connection i.e. analog switch output microphone acquisition.Together
Reason, when inputting as low level 0, the Line IN signals of corresponding output external audio source input.
As shown in figure 3, it is preferred that in microphone input circuit in parallel access Anti-static device D1, D2, prevent electrostatic interference
Cause the failure of microphone device.
Embodiment two, the present embodiment propose a kind of bluetooth headset, and the bluetooth headset of the present embodiment has bluetooth and wirelessly connects
It connects and inputs two kinds of operating modes with tone frequency channel wire, further include Dolby circuit recorded in embodiment one, can specifically join embodiment one
In it is recorded, this will not be repeated here.
Certainly, the above description is not intended to limit the present invention, and the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the essential scope of the utility model,
It should also belong to the protection scope of the utility model.
Claims (10)
1. a kind of double working modes bluetooth headset Dolby circuit, including linear input circuit and microphone input circuit, feature
It is：Electromagnetism is connected between the ground wire terminal of the linear input circuit and the ground wire terminal of the microphone input circuit to do
Disturb straining element.
2. double working modes bluetooth headset Dolby circuit according to claim 1, it is characterised in that：The electromagnetic interference suppression
Element processed is magnetic bead.
3. double working modes bluetooth headset Dolby circuit according to claim 1, it is characterised in that：Simulation is further included to open
Pass, the linear input circuit and the microphone input circuit connect the input terminal of the analog switch, the simulation respectively
The output terminal of switch is connect with Bluetooth chip.
4. double working modes bluetooth headset Dolby circuit according to claim 3, it is characterised in that：The microphone input
Circuit includes the first filter circuit, and first filter circuit is connected to the first of microphone input terminal and the analog switch
Between input terminal.
5. double working modes bluetooth headset Dolby circuit according to claim 4, it is characterised in that：The microphone input
Circuit further includes radiofrequency signal suppression circuit, and the radiofrequency signal suppression circuit is connected to first filter circuit and the mould
Between the first input end for intending switch.
6. double working modes bluetooth headset Dolby circuit according to claim 5, it is characterised in that：The radiofrequency signal suppression
Circuit processed includes the first inductance, and first inductance is connected on the first input of first filter circuit and the analog switch
Between end.
7. double working modes bluetooth headset Dolby circuit according to claim 6, it is characterised in that：First inductance with
The first capacitance is also associated between the first input end of the analog switch.
8. according to claim 3-7 any one of them double working modes bluetooth headset Dolby circuits, it is characterised in that：The line
Property input circuit include the second filter circuit and gain adjustment circuit, second filter circuit and gain adjustment circuit series connection connect
It is connected between linear input terminal and the second input terminal of the analog switch.
9. double working modes bluetooth headset Dolby circuit according to claim 8, it is characterised in that：Second filtered electrical
Road includes the third capacitance and the 4th capacitance that are in parallel, and one end of the third capacitance and the 4th capacitance is connected to linear defeated
Enter between terminal and the gain adjustment circuit, ground wire terminal of the other end respectively with linear input circuit is connect, the increasing
The second capacitance is connected between beneficial adjustment circuit and the second input terminal of the analog switch.
10. a kind of bluetooth headset, it is characterised in that：Including claim 1-9 any one of them Dolby circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721817714.7U CN207603866U (en) | 2017-12-22 | 2017-12-22 | A kind of double working modes bluetooth headset Dolby circuit and bluetooth headset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721817714.7U CN207603866U (en) | 2017-12-22 | 2017-12-22 | A kind of double working modes bluetooth headset Dolby circuit and bluetooth headset |
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|---|---|
| CN207603866U true CN207603866U (en) | 2018-07-10 |
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ID=62767553
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|---|---|---|---|
| CN201721817714.7U Active CN207603866U (en) | 2017-12-22 | 2017-12-22 | A kind of double working modes bluetooth headset Dolby circuit and bluetooth headset |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218640A (en) * | 2018-09-13 | 2019-01-15 | 广州市保伦电子有限公司 | A kind of small space meeting central control system and its tuning control method, storage medium |
| CN109784897A (en) * | 2018-12-28 | 2019-05-21 | 易票联支付有限公司 | A kind of cross-border settlement system and method |
| CN116721641A (en) * | 2023-06-15 | 2023-09-08 | 北京青云创新科技发展有限公司 | Liquid crystal display driving system suitable for ultralow temperature environment |
-
2017
- 2017-12-22 CN CN201721817714.7U patent/CN207603866U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109218640A (en) * | 2018-09-13 | 2019-01-15 | 广州市保伦电子有限公司 | A kind of small space meeting central control system and its tuning control method, storage medium |
| CN109784897A (en) * | 2018-12-28 | 2019-05-21 | 易票联支付有限公司 | A kind of cross-border settlement system and method |
| CN116721641A (en) * | 2023-06-15 | 2023-09-08 | 北京青云创新科技发展有限公司 | Liquid crystal display driving system suitable for ultralow temperature environment |
| CN116721641B (en) * | 2023-06-15 | 2024-01-16 | 北京青云创新科技发展有限公司 | Liquid crystal display driving system suitable for ultralow temperature environment |
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