CN203632848U - Handheld electronic device - Google Patents
Handheld electronic device Download PDFInfo
- Publication number
- CN203632848U CN203632848U CN201320667184.8U CN201320667184U CN203632848U CN 203632848 U CN203632848 U CN 203632848U CN 201320667184 U CN201320667184 U CN 201320667184U CN 203632848 U CN203632848 U CN 203632848U
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- pin
- electric device
- portable electric
- connecting interface
- electrically connected
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Abstract
The utility model discloses a handheld electronic device. The device comprises a connection interface. The connection interface is used for inserting or unplugging a connection interface of an earphone. The connection interface of the handheld electronic device and the connection interface of the earphone possess plural pins. One pin receives a microphone bias voltage and another pin is electrically connected to a reference potential through an impedance unit. When the connection interface of the earphone is inserted into the connection interface of the handheld electronic device, the microphone bias voltage, each pin of the connection interface of the handheld electronic device, each pin of the connection interface of the earphone and the impedance unit are electrically connected to the reference potential in a series connection mode. The handheld electronic device of the utility model makes power of the microphone bias voltage be consumed on the impedance unit so that an explosion sound generated by insertion and unplugging of the earphone can be eliminated.
Description
Technical field
The utility model belongs to portable electric device field, especially relates to a kind of portable electric device having about the explosion sound that can eliminate headset plugging (POP sound).
Background technology
The working power of the earphone of call microphone generally comes from the microphone bias voltage of portable electric device, and this microphone bias voltage is direct current (DC) bias.
But in the time that the earphone of call microphone carries out Plug Action from portable electric device, the microphone bias voltage of portable electric device can be supplied to its electric current in the loud speaker of earphone via electrical loop, thereby causes user to hear explosion sound.
Utility model content
The purpose of this utility model is to provide a kind of portable electric device, it comprises a connecting interface, this connecting interface can be for the connecting interface plug of earphone, wherein the connecting interface of portable electric device and the connecting interface of earphone all have a plurality of pins, an one pin receives microphone bias voltage, another pin sees through impedance unit and is electrically connected to reference potential, in the time that the connecting interface of earphone plugs the connecting interface to portable electric device, wherein microphone bias voltage, each pin of the connecting interface of portable electric device, each pin and the impedance unit of the connecting interface of earphone are all electrically connected to reference potential with series system.
The connecting interface of portable electric device described in the utility model is mainly in the time of the connecting interface plugging when the connecting interface of earphone to portable electric device, and wherein each pin and the impedance unit of the connecting interface of each pin of the connecting interface of microphone bias voltage, portable electric device, earphone are all electrically connected to reference potential with series system.Thus, portable electric device described in the utility model just can make the power of microphone bias voltage can consume at above-mentioned impedance unit, and then can eliminate the explosion sound that headset plugging produces.
Accompanying drawing explanation
Fig. 1 is the inside main circuit of the portable electric device described in the utility model one embodiment and the inside main circuit with the earphone of call microphone.
[symbol description]
100: portable electric device
110,210: connecting interface
112,114,116,118,212,214,216,218: pin
120: amplification module
122,124: the output of amplification module
126: the input of amplification module
130: switch module
140: control module
200: earphone
220: call microphone
Rm, Rs: impedance unit
MIC_BIAS: microphone bias voltage
VSS: reference potential
SPO1, SPO2: loud speaker signal
SW1, SW2, SW3: switch
CS1, CS2: control signal
SPK_R: the R channel impedance of loud speaker
SPK_L: the L channel impedance of loud speaker
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Figure 1 shows that the inside main circuit of the portable electric device described in an embodiment and there is the inside main circuit of the earphone of call microphone.In Fig. 1, indicate 100 and represent described portable electric device, indicate 200 earphones described in expression.As shown in Figure 1, this portable electric device 100 includes connecting interface 110, amplification module 120, switch module 130 and control module 140.Connecting interface 110 has four pins (being respectively shown in label 112,114,116 and 118), wherein pin 112 receives microphone bias voltage MIC_BIAS by impedance unit Rm, pin 114 is electrically connected to reference potential VSS by impedance unit Rs, this reference potential is earthing potential, impedance unit Rm and impedance unit Rs are resistance in addition, and the resistance value of this impedance unit Rs is greater than the resistance value of impedance unit Rm.Amplification module 120 has two outputs (being respectively shown in label 122 and 124) and input 126, and wherein output 122 is exported respectively loud speaker signal SPO1 and loud speaker signal SPO2 with output 124.Switch module 130 has the first pin group, the second pin group and the 3rd pin group, and these three pin groups all have a switch.Wherein, switch SW 1 in the first pin group is electrically connected between the pin 114 and reference potential VSS of connecting interface 110, switch SW 3 in the second pin group is electrically connected between the pin 116 of connecting interface 110 and the output 122 of amplification module 120, and the switch SW 2 in the 3rd pin group is electrically connected between the pin 118 of connecting interface 110 and the output 124 of amplification module 120.Control module 140 is electrically connected to the input 126 and switch module 130 output control signal CS1 and control signal CS2 respectively of amplification module 120.Wherein, amplification module 120 determines to export loud speaker signal SPO1 from output 122 according to above-mentioned control signal CS1, and determine to export loud speaker signal SPO2 from output 124, switch module 130 keeps open-circuit condition by all switch SW 1 in above-mentioned three pin groups, SW2 with SW3 according to controlling signal CS2 and determining, wherein control module 140 is not dialled while putting all switch SW 1, SW2 and the SW3 maintenance open-circuit condition of three pin groups in just control switch module 130 at sound.The same time of control signal CS2 that all controlled module 140 of on off state of described switch SW 1, SW2 and SW3 is exported is controlled.In this embodiment, switch module 130 also keeps short-circuit condition by all switch SW 1 in above-mentioned three pin groups, SW2 with SW3 according to controlling signal CS2 and determining, wherein control module 140 dials at sound all switch SW 1, SW2 and the SW3 maintenance short-circuit condition of controlling three pin groups in switch module 130 while putting.
In addition, as shown in Figure 1, earphone 200 includes connecting interface 210, call microphone 220, the R channel impedance SPK_R of loud speaker and the L channel impedance SPK_L of loud speaker.Connecting interface 210 has four pins (being respectively shown in label 212,214,216 and 218).Wherein, pin 212 sees through call microphone 220 and is electrically connected to pin 214, receives above-mentioned microphone bias voltage MIC_BIAS.Pin 216 is electrically connected to pin 214 by the R channel impedance SPK_R of loud speaker, to transmit above-mentioned loud speaker signal SPO1.The L channel impedance SPK_L that pin 218 sees through loud speaker is electrically connected to pin 214, to transmit above-mentioned loud speaker signal SPO2.
Specifically, do not dial and put and when earphone 200 plugs, all switch SW 1 of three pin groups in switch module 130, SW2 and SW3 are kept open-circuit condition by the control signal CS2 that switch module 130 is just exported according to control module 140 when sound.Now, the control signal CS1 that amplification module 120 also can be exported according to control module 140 does not export loud speaker signal SPO1 and loud speaker signal SPO2 by its output 122 with output 124.
If the magnitude of voltage of microphone bias voltage MIC_BIAS is 3 volts, the resistance value of impedance unit Rm is set as 2k ohm, and the left and right acoustic channels impedance SPK_R of loud speaker and the resistance value of SPK_L are 32 ohm, and the resistance value of impedance unit Rs is set as 100k ohm.In the time that earphone 200 plugs, the pin 216 of the connecting interface 210 in earphone 200 corresponds to the pin 112 of the connecting interface 110 in portable electric device 100, and pin 218 corresponds to the pin 114 of the connecting interface 110 in portable electric device 100, the current circuit of microphone bias voltage MIC_BIAS is by impedance unit Rm, R channel impedance SPK_R, L channel impedance SPK_L and impedance unit Rs, that is magnitude of voltage=I × Rm+I × SPK_R+I × SPK_L+I × Rs of microphone bias voltage MIC_BIAS, the current circuit I that can calculate microphone bias voltage MIC_BIAS by this expression formula is that 3V ÷ (100k+2k)=29.41 μ A is (because the resistance value of impedance unit Rm and Rs is that 102k nurse difficult to understand is 32 ohm much larger than the resistance value of the left and right acoustic channels impedance of loud speaker, so calculating the current value of current circuit can be ignored the left and right acoustic channels impedance of loud speaker).Now, the voltage drop that the left and right acoustic channels impedance of loud speaker produces is 29.41 μ A × 32 ohm=0.941mV, the voltage drop that the left and right acoustic channels impedance of this loud speaker produces almost can be ignored in overall current loop, and also deficiency is so that the left and right acoustic channels of mobile phone speaker produces explosion sound in the time that earphone 200 plugs.Thus, when sound is not dialled while putting, all switch SW 1, SW2 and SW3 that control module 140 has been controlled three pin groups in switch module 130 keep open-circuit condition, this can consume the power that makes microphone bias voltage on impedance unit Rm, and then can eliminate the explosion sound that headset plugging produces.
In addition, dial and put and when earphone 200 plugs when sound, the control signal CS2 that switch module 130 is just exported according to the control module 140 and all switch SW 1 in three pin groups in switch module 130, SW2 and SW3 are kept to short-circuit condition.Now, the control signal CS1 that amplification module 120 also can be exported according to control module 140 exports respectively loud speaker signal SPO1 and loud speaker signal SPO2 by its output 122 with output 124, and by switch SW 3 and switch SW 2, its loud speaker signal SPO1 and loud speaker signal SPO2 are sent in the loud speaker of earphone 200.For example, due in the situation that having sound (musical sound) group to put, in the time that earphone 200 plugs, musical sound can be mingled with earphone 200 and plug produced explosion sound, and therefore user can't hear earphone 200 to plug produced explosion sound.
In sum, the connecting interface of portable electric device described in the utility model is mainly in the time of the connecting interface plugging when the connecting interface of earphone to portable electric device, and wherein each pin and the impedance unit of the connecting interface of each pin of the connecting interface of microphone bias voltage, portable electric device, earphone are all electrically connected to reference potential with series system.Thus, portable electric device described in the utility model just can make the power of microphone bias voltage can consume at above-mentioned impedance unit, and then can eliminate the explosion sound that headset plugging produces.
Finally; what must again illustrate is; in previous embodiment of the present utility model, disclosed constituent components is only for illustrating; not be used for limiting the protection range of this case; all other easy full of beard and structural change; or with the alternate variation of other equivalent elements, the protection range that also should be this case is contained.
Claims (8)
1. a portable electric device, it is characterized in that: comprise a connecting interface, this connecting interface can be for a connecting interface plug of an earphone, wherein the connecting interface of this portable electric device and the connecting interface of this earphone all have a plurality of pins, described pin one receives a microphone bias voltage, another is electrically connected to a reference potential by an impedance unit described pin, in the time that the connecting interface of this earphone plugs the connecting interface to this portable electric device, wherein microphone bias voltage, the described pin of the connecting interface of portable electric device, described pin and this impedance unit of the connecting interface of this earphone are all electrically connected to this reference potential with a series system.
2. portable electric device as claimed in claim 1, it is characterized in that: the pin of described connecting interface is respectively one first pin, one second pin, one the 3rd pin and one the 4th pin, wherein the first pin is by one first impedance unit to receive this microphone bias voltage, and the second pin is electrically connected to this reference potential by one second impedance unit.
3. portable electric device as claimed in claim 2, is characterized in that: also comprise:
One amplification module, has one first output, one second output and an input, and wherein this first output and this second output are exported respectively one first loud speaker signal and one second loud speaker signal;
One switch module, there is one first pin group, one second pin group and one the 3rd pin group, wherein this first pin group is electrically connected between this second pin and this reference potential, this the second pin group is electrically connected between the 3rd pin and this first output, and the 3rd pin group is electrically connected between the 4th pin and this second output; And
One control module, the input and the switch module that are electrically connected to this amplification module are exported respectively one first control signal and one second control signal, wherein this amplification module determines to export this first loud speaker signal from this first output according to this first control signal, and determine to export this second loud speaker signal from this second output, this switch module determines this first pin group, this second pin group and the 3rd pin group to keep open-circuit condition according to this second control signal
Wherein, this control module is not dialled in sound this first pin group, this second pin group and the 3rd pin group that just control in this switch module while putting and is kept open-circuit condition.
4. portable electric device as claimed in claim 3, it is characterized in that: described switch module is also controlled signal and determined according to second this first pin group, this second pin group and the 3rd pin group are kept to short-circuit condition, this control module is dialled and is controlled this first pin group, this second pin group and the 3rd pin group maintenance short-circuit condition in this switch module while putting in sound.
5. portable electric device as claimed in claim 3, is characterized in that: described switch module comprises:
One first switch, is electrically connected between this second pin and this reference potential;
One second switch, is electrically connected between the 3rd pin and this first output; And
One the 3rd switch, is electrically connected between the 4th pin and this second output,
Wherein, the on off state of this first switch, this second switch and the 3rd switch is controlled by this second control same time of signal of this control module output all.
6. portable electric device as claimed in claim 2, is characterized in that: described the first impedance unit and this second impedance unit are a resistance.
7. portable electric device as claimed in claim 2, is characterized in that: the resistance value of described the second impedance unit is greater than the resistance value of this first impedance unit.
8. portable electric device as claimed in claim 1, is characterized in that: described reference potential is an earthing potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320667184.8U CN203632848U (en) | 2013-10-28 | 2013-10-28 | Handheld electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320667184.8U CN203632848U (en) | 2013-10-28 | 2013-10-28 | Handheld electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203632848U true CN203632848U (en) | 2014-06-04 |
Family
ID=50819283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320667184.8U Expired - Fee Related CN203632848U (en) | 2013-10-28 | 2013-10-28 | Handheld electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203632848U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104380697A (en) * | 2014-06-30 | 2015-02-25 | 华为技术有限公司 | A terminal and a system which can reduce noise generated in earphone insertion and pulling processes |
| CN108111951A (en) * | 2014-06-30 | 2018-06-01 | 华为技术有限公司 | A kind of terminal and system for reducing noise during headset plugging |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
-
2013
- 2013-10-28 CN CN201320667184.8U patent/CN203632848U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104380697A (en) * | 2014-06-30 | 2015-02-25 | 华为技术有限公司 | A terminal and a system which can reduce noise generated in earphone insertion and pulling processes |
| CN108111951A (en) * | 2014-06-30 | 2018-06-01 | 华为技术有限公司 | A kind of terminal and system for reducing noise during headset plugging |
| CN108111951B (en) * | 2014-06-30 | 2020-07-07 | 华为技术有限公司 | Terminal and system capable of reducing noise in earphone plugging and unplugging process |
| CN109922394A (en) * | 2017-12-13 | 2019-06-21 | 华为终端有限公司 | Bias voltage output circuit and driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140604 Termination date: 20181028 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |