CN105635918A - Mobile terminal and current sound suppression circuit - Google Patents
Mobile terminal and current sound suppression circuit Download PDFInfo
- Publication number
- CN105635918A CN105635918A CN201610115767.8A CN201610115767A CN105635918A CN 105635918 A CN105635918 A CN 105635918A CN 201610115767 A CN201610115767 A CN 201610115767A CN 105635918 A CN105635918 A CN 105635918A
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- CN
- China
- Prior art keywords
- connecting device
- circuit
- current sound
- ground wire
- microphone
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2203/00—Details of circuits for transducers, loudspeakers or microphones covered by H04R3/00 but not provided for in any of its subgroups
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Telephone Set Structure (AREA)
Abstract
The invention discloses a current sound suppression circuit. The current sound suppression circuit comprises a microphone and a first ground wire both arranged on a small board of a circuit board, a second ground wire arranged on a main board of the circuit board, and a first connecting device and a second connecting device selectively connected with the current sound suppression circuit, wherein when the first connecting device is connected with the current sound suppression circuit, the negative electrode of the microphone is connected with the first ground wire through the first connecting device; and when the second connecting device is connected with the current sound suppression circuit, the negative electrode of the microphone is connected with the second ground wire through the second connecting device. When the ground wire connected with the microphone is interfered to enable the microphone to generate a current sound, change of the wire layout of the circuit board is not required, so that the development period is shortened, the development cost is reduced, the generation of the current sound can be suppressed to the maximum extent, and the user experience is improved. The invention also provides a mobile terminal comprising the current sound suppression circuit.
Description
Technical field
The present invention relates to technical field of communication equipment, particularly relate to a kind of mobile terminal and current sound suppression circuit thereof.
Background technology
Along with the development of the communication technology, the requirement of the speech quality of mobile terminal is also more and more higher, in order to avoid the current sound producing " Zi Zi " in communication process, it is necessary to the microphone ensured in mobile terminal is not interfered.
At present, the mode suppressing current sound is make charging inlet be connected with the ground wire of circuit card, the negative pole of microphone is connected with the ground wire of circuit card by a non-zero resistance, and this circuit can avoid the signal disturbing between charging inlet circuit and microphone circuit, thus suppresses current sound.
But when the ground wire place that microphone connects is unclean or when walking the ground circuit that line cannot avoid radio frequency (when such as having antenna when ground wire place) or big current of microphone end, the microphone in this circuit still can be interfered, generation current sound.
Wanting to solve current sound under this kind of circuit, then need the wiring changing circuit card, thus cause construction cycle length and cost of development height, the call that even possibly cannot solve the generation of current sound and affect user is experienced.
Therefore, how to provide a kind of to save development time and cost of development and mobile terminal that the call of user experiences can be promoted and current sound suppresses circuit to be the problem that those skilled in the art need to solve at present.
Summary of the invention
It is an object of the invention to provide a kind of mobile terminal and current sound suppression circuit thereof, when the ground wire that microphone connects is interfered and makes microphone generation current sound, do not need the wiring changing circuit card, shorten the construction cycle, reduce cost of development, and can farthest suppress the generation of current sound, it is to increase Consumer's Experience.
For solving the problems of the technologies described above, the present invention provides a kind of current sound and suppresses circuit, comprises the first connecting device and the 2nd connecting device that the microphone being arranged on circuit card platelet and the first ground wire, the 2nd ground wire being arranged on circuit card mainboard and selectivity access described current sound suppression circuit; Wherein:
When described first connecting device accesses described current sound suppression circuit, the negative pole of described microphone connects described first ground wire by described first connecting device;
When described 2nd connecting device accesses described current sound suppression circuit, the negative pole of described microphone connects described 2nd ground wire by described 2nd connecting device.
Preferably, described circuit card mainboard also comprising coding and decoding chip, described coding and decoding chip is provided with negative pole input pin, the negative pole of described microphone is connected with the described negative pole input pin of described coding and decoding chip;
When described 2nd connecting device accesses described current sound suppression circuit, the described negative pole input pin of described coding and decoding chip connects described 2nd ground wire by described 2nd connecting device.
Preferably, described first connecting device and described 2nd connecting device are resistance, inductance or magnetic bead.
Preferably, the resistance of described resistance is 0 ��.
Preferably, described circuit card platelet and described circuit card mainboard are pcb board.
For solving the problems of the technologies described above, present invention also offers a kind of mobile terminal, comprise the circuit described in above arbitrary item.
The present invention provides a kind of mobile terminal and current sound suppresses circuit, by control the first connecting device and the 2nd connecting device whether put in circuit in the present invention, the negative pole of microphone is optionally connected with the first ground wire on circuit card platelet or the 2nd ground wire on circuit card mainboard. As can be seen here, when the ground wire that microphone connects is interfered and makes microphone generation current sound, by adjusting the first connecting device and the 2nd connecting device, microphone can be made to switch to be connected with another ground wire, thus suppress the generation of current sound, and not need the wiring changing circuit card, therefore shortened the construction cycle, reduce cost of development, and can farthest suppress the generation of current sound, it is to increase Consumer's Experience.
Accompanying drawing explanation
In order to the technical scheme being illustrated more clearly in the embodiment of the present invention, it is briefly described to the accompanying drawing used required in prior art and embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation that a kind of current sound provided by the invention suppresses circuit;
Fig. 2 is that a kind of current sound provided by the invention suppresses in circuit when the electrical block diagram after the first connecting device put in circuit;
Fig. 3 is that a kind of current sound provided by the invention suppresses in circuit when the electrical block diagram after the 2nd connecting device put in circuit;
Wherein, in Fig. 2-Fig. 3:
MIC microphone, R1 first connecting device, R2 biasing resistor, R3 the 2nd connecting device, IN+ positive pole input pin, IN-negative pole input pin, GND ground connection pin, MICBIAS DC offset voltage input terminus.
Embodiment
The core of the present invention is to provide a kind of mobile terminal and current sound suppresses circuit, when the ground wire that microphone connects is interfered and makes microphone generation current sound, do not need the wiring changing circuit card, shorten the construction cycle, reduce cost of development, and can farthest suppress the generation of current sound, it is to increase Consumer's Experience.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
The present invention provides a kind of current sound and suppresses circuit, shown in Figure 1, and Fig. 1 is the structural representation that a kind of current sound provided by the invention suppresses circuit;
This system comprises the first connecting device 12 and the 2nd connecting device 14 of the microphone 11 being arranged on circuit card platelet and the first ground wire 13, the 2nd ground wire 15 being arranged on circuit card mainboard and selectivity access current sound suppression circuit; Wherein:
When the first connecting device 12 accesses current sound suppression circuit, the negative pole of microphone 11 connects the first ground wire 13 by the first connecting device 12;
When the 2nd connecting device 14 accesses current sound suppression circuit, the negative pole of microphone 11 connects the 2nd ground wire 15 by the 2nd connecting device 14.
As preferably, circuit card mainboard also comprising coding and decoding chip 16, coding and decoding chip 16 being provided with negative pole input pin, the negative pole of microphone 11 is connected with the negative pole input pin of coding and decoding chip 16;
When the 2nd connecting device 14 accesses current sound suppression circuit, the negative pole input pin of coding and decoding chip 16 connects the 2nd ground wire 15 by the 2nd connecting device 14.
It is understandable that, when adopting above-mentioned mode of connection, the negative pole of microphone 11 is not directly connected with the 2nd connecting device 14, but due to coding and decoding chip 16 negative pole input pin respectively negative pole and the 2nd connecting device 14 with microphone 11 be connected, thus the negative pole making microphone 11 is indirectly connected with the 2nd connecting device 14.
In addition, the negative pole of microphone 11 also can be connected with the negative pole input pin of the 2nd connecting device 14 and coding and decoding chip 16 respectively.
Certainly, concrete connection line is not limited by the present invention, as long as the wiring mode that can realize the object of the present invention is all within protection scope of the present invention.
It should be appreciated that put in circuit when the first connecting device 12 is different from the 2nd connecting device 14, which connecting device put in circuit can be determined by concrete selection according to the interference situation at the first ground wire 13 and the 2nd ground wire 15 place. When the first ground wire 13 place is interfered, the first connecting device 12 is taken off, by the 2nd connecting device 14 put in circuit; When the 2nd ground wire 15 place is interfered, the 2nd connecting device 14 is taken off, by the first connecting device 12 put in circuit.
Shown in Fig. 2 and Fig. 3, Fig. 2 is that a kind of current sound provided by the invention suppresses in circuit when the electrical block diagram after the first connecting device put in circuit; Fig. 3 is that a kind of current sound provided by the invention suppresses in circuit when the electrical block diagram after the 2nd connecting device put in circuit.
Wherein, the operation the first connecting device 12 and the 2nd connecting device 14 being accessed or being taken off circuit is manual hand manipulation.
In addition, in figs. 2 and 3, the positive pole input pin of coding and decoding chip 16 is connected with the positive pole of microphone 11, and the positive pole of microphone 11 is also connected with DC offset voltage input terminus by biasing resistor, and the ground connection pin of coding and decoding chip 16 is connected with the 2nd ground wire 15.
Further it will be seen that due to the first connecting device 12 and the 2nd connecting device 14 not put in circuit simultaneously, therefore the first connecting device 12 and the 2nd connecting device 14 can be same components and parts. When microphone 11 need by be connected with the first ground wire 13 change into be connected with the 2nd ground wire 15 time, by these components and parts by being arranged between microphone 11 and the first ground wire 13, change into and being arranged between microphone 11 and the 2nd ground wire 15.
In addition, the first connecting device 12 and the 2nd connecting device 14 can also be two components and parts, and when one of them components and parts put in circuit, another components and parts are then in idle state.
Certainly, the present invention is not particularly limited the first connecting device 12 is same components and parts or two different components and parts from the 2nd connecting device 14.
Wherein, the first connecting device 12 and the 2nd connecting device 14 are resistance, inductance or magnetic bead. Certainly, the type of the first connecting device 12 and the 2nd connecting device 14 is not particularly limited to by the present invention.
As preferably, the first connecting device 12 and the 2nd connecting device 14 adopt the components and parts of identical type. Certainly, this is not particularly limited by the present invention, as long as the type of the components and parts selected can realize the object of the present invention.
Further it will be seen that when the first connecting device 12 and the 2nd connecting device 14 are resistance, the resistance of resistance can be 0 ��. Certainly, the resistance of resistance also can be other numerical value, and staff can select the resistance of suitable resistance according to actual needs, and this is not particularly limited by the present invention.
In addition, resistance here can be paster resistance.
It is understandable that, extremely it is convenient to (only need to stick or take off) is installed due to paster resistance, therefore when the ground wire that microphone 11 connects needs to switch, such as when microphone 11 need by be connected with the first ground wire 13 change into be connected with the 2nd ground wire 15 time, only need to take the first connecting device 12 off, 2nd connecting device 14 is sticked, operation flexible and convenient. Certainly, the type of resistance is not particularly limited to by the present invention.
In addition, the induction reactance value of inductance is not also particularly limited to by the present invention.
Wherein, the interference that the first ground wire 13 or the 2nd ground wire 15 place are subject to comprises:
Due to the interference that the GSM antenna at charging inlet place causes, or walking line and cannot avoid the loop of big current and the interference etc. that causes due to ground wire place.
Certainly, the interference type that ground wire is subject to by the present invention does not limit, any interference that the interference of microphone 11 generation current sound can be made all can to can be regarded as ground wire and be subject to.
Wherein, circuit card platelet here and circuit card mainboard are pcb board. Certainly, the particular type of circuit card (comprising circuit card platelet and circuit card mainboard) is not limited by the present invention.
For convenience of to the understanding of the present invention program, below just current sound provided by the invention suppress the concrete working condition of circuit to do simple introduction:
First by the first connecting device 12 put in circuit, and the 2nd connecting device 14 not put in circuit, now the negative pole of microphone 11 is connected with the first ground wire 13;
When judging that the first ground wire 13 is interfered, when namely microphone 11 creates current sound, being taken off by the first connecting device 12, by the 2nd connecting device 14 put in circuit, now, the negative pole of microphone 11 is connected with the 2nd ground wire 15.
It should be appreciated that be not interfered due to the 2nd ground wire 15, therefore namely can avoid the generation of current sound as far as possible by making the negative pole of microphone 11 be connected with the 2nd ground wire 15.
With reason, if first by the 2nd connecting device 14 put in circuit, and the first connecting device 12 not put in circuit, now the negative pole of microphone 11 is connected with the 2nd ground wire 15;
When judging that the 2nd ground wire 15 is interfered, being taken off by the 2nd connecting device 14, by the first connecting device 12 put in circuit, now, the negative pole of microphone 11 is connected with the first ground wire 13.
It is understandable that, with the negative pole of microphone 11 only compared with the single earthing mode that the first ground wire 13 is connected, circuit in the present invention adds redundancy earthing mode, the negative pole of microphone 11 can be made optionally to be connected with the first ground wire 13 or the 2nd ground wire 15 (namely optionally less with interference ground wire is connected), owing to the first ground wire 13 is different from the interference situation of the 2nd ground wire 15, therefore the present invention inhibits the generation of current sound greatly.
The present invention provides a kind of current sound and suppresses circuit, by control the first connecting device and the 2nd connecting device whether put in circuit in this circuit, the negative pole of microphone is optionally connected with the first ground wire on circuit card platelet or the 2nd ground wire on circuit card mainboard. As can be seen here, when the ground wire that microphone connects is interfered and makes microphone generation current sound, by adjusting the first connecting device and the 2nd connecting device, microphone can be made to switch to be connected with another ground wire, thus suppress the generation of current sound, and not need the wiring changing circuit card, therefore shortened the construction cycle, reduce cost of development, and can farthest suppress the generation of current sound, it is to increase Consumer's Experience.
Present invention also offers a kind of mobile terminal, comprise above-mentioned current sound and suppress circuit.
It should be noted that, in this manual, the such as relational terms of first and second grades and so on is only used for separating an entity or operation with another entity or operational zone, and not necessarily requires or imply to there is any this kind of actual relation or sequentially between these entities or operation. And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, so that comprise the process of a series of key element, method, article or equipment not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise the key element intrinsic for this kind of process, method, article or equipment. When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are enable to realize or use the present invention. To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments. Therefore, the present invention can not be limited in these embodiments shown in this article, but be met the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a current sound suppresses circuit, it is characterized in that, comprise the microphone being arranged on circuit card platelet and the first ground wire, the 2nd ground wire being arranged on circuit card mainboard and selectivity access the first connecting device and the 2nd connecting device that described current sound suppresses circuit; Wherein:
When described first connecting device accesses described current sound suppression circuit, the negative pole of described microphone connects described first ground wire by described first connecting device;
When described 2nd connecting device accesses described current sound suppression circuit, the negative pole of described microphone connects described 2nd ground wire by described 2nd connecting device.
2. circuit according to claim 1, it is characterized in that, also comprising coding and decoding chip on described circuit card mainboard, described coding and decoding chip is provided with negative pole input pin, the negative pole of described microphone is connected with the described negative pole input pin of described coding and decoding chip;
When described 2nd connecting device accesses described current sound suppression circuit, the described negative pole input pin of described coding and decoding chip connects described 2nd ground wire by described 2nd connecting device.
3. circuit according to claim 2, it is characterised in that, described first connecting device and described 2nd connecting device are resistance, inductance or magnetic bead.
4. circuit according to claim 3, it is characterised in that, the resistance of described resistance is 0 ��.
5. circuit according to claim 1, it is characterised in that, described circuit card platelet and described circuit card mainboard are pcb board.
6. a mobile terminal, it is characterised in that, comprise the circuit as according to any one of claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610115767.8A CN105635918A (en) | 2016-02-29 | 2016-02-29 | Mobile terminal and current sound suppression circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610115767.8A CN105635918A (en) | 2016-02-29 | 2016-02-29 | Mobile terminal and current sound suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105635918A true CN105635918A (en) | 2016-06-01 |
Family
ID=56050333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610115767.8A Pending CN105635918A (en) | 2016-02-29 | 2016-02-29 | Mobile terminal and current sound suppression circuit |
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| Country | Link |
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| CN (1) | CN105635918A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604182A (en) * | 2017-01-26 | 2017-04-26 | 北京糖护科技有限公司 | Low power consumption digital signal to analog signal circuit and method with microphone |
| CN111385684A (en) * | 2018-12-29 | 2020-07-07 | 北京小米移动软件有限公司 | Microphone anti-interference device and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070098184A1 (en) * | 2005-10-26 | 2007-05-03 | Nec Infronita Corporation | Audio input/output device and method for switching input/output functions |
| CN101335536A (en) * | 2007-06-28 | 2008-12-31 | 启碁科技股份有限公司 | Electronic apparatus reducing audio noise generated due to uneven ground and communication apparatus thereof |
| CN203435133U (en) * | 2013-06-25 | 2014-02-12 | 青岛海信移动通信技术股份有限公司 | Current noise suppression circuit and mobile terminal |
-
2016
- 2016-02-29 CN CN201610115767.8A patent/CN105635918A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070098184A1 (en) * | 2005-10-26 | 2007-05-03 | Nec Infronita Corporation | Audio input/output device and method for switching input/output functions |
| CN101335536A (en) * | 2007-06-28 | 2008-12-31 | 启碁科技股份有限公司 | Electronic apparatus reducing audio noise generated due to uneven ground and communication apparatus thereof |
| CN203435133U (en) * | 2013-06-25 | 2014-02-12 | 青岛海信移动通信技术股份有限公司 | Current noise suppression circuit and mobile terminal |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604182A (en) * | 2017-01-26 | 2017-04-26 | 北京糖护科技有限公司 | Low power consumption digital signal to analog signal circuit and method with microphone |
| CN111385684A (en) * | 2018-12-29 | 2020-07-07 | 北京小米移动软件有限公司 | Microphone anti-interference device and electronic equipment |
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| PB01 | Publication | ||
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Application publication date: 20160601 |