CN206481457U - A kind of earphone detection circuit and audio frequency apparatus - Google Patents
A kind of earphone detection circuit and audio frequency apparatus Download PDFInfo
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- CN206481457U CN206481457U CN201720097032.7U CN201720097032U CN206481457U CN 206481457 U CN206481457 U CN 206481457U CN 201720097032 U CN201720097032 U CN 201720097032U CN 206481457 U CN206481457 U CN 206481457U
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Abstract
The utility model provides a kind of earphone detection circuit and audio frequency apparatus.The circuit includes the interruption pin and L channel pin being located on earphone socket；The interruption pin connection resistance and output end；The L channel pin is grounded by the metal-oxide-semiconductor component of two-way stop.The utility model is grounded by the metal-oxide-semiconductor component at the L channel pin on earphone socket by two-way stop, the electric current for making earphone insert moment generation is released by the metal-oxide-semiconductor component of the two-way stop, avoid the electric current and flow through earphone, so that POP noises when eliminating earphone insertion.
Description
Technical field
The utility model is related to audio frequency apparatus, more particularly to a kind of earphone detection circuit and a kind of audio frequency apparatus.
Background technology
A large amount of audio frequency apparatuses simultaneous with putting and earphone interface outside in the market.These audio frequency apparatuses are inserted in user
Earphone path is switched to, it is necessary to which voice-frequency channel is put from outside after earphone, this is accomplished by circuitry, one earphone inspection of increase
Slowdown monitoring circuit.As shown in figure 1, in this circuit, being provided with a pair of headset detection pin being made up of interruption pin and L channel pin, use
In having detected whether earphone insertion.Pull-up resistor can be used by interrupting pin, and the level interrupted on pin is moved on logic high.
When earphone inserts earphone interface, headset plug L channel touches the L channel pin on socket, due to headset plug L channel
There are 32 ohm of equivalent resistance, 32 Ohmic resistances and the pull-up resistor partial pressure for interrupting pin between headset plug ground, so as to drag down
The level on pin is interrupted, by the change of this level microcontroller can be notified to have earphone insertion.
But because headset detection pin is pulled upward to logic high when being not inserted into earphone, after earphone is inserted, meeting
There is an electric current to flow through earphone by headset detection pin, then earphone socket is flowed on the ground by earphone lower margin.
Before earphone insertion, there is no this electric current on earphone, the moment inserted in earphone, there is such a electric current to flow through ear
Machine is to ground, and therefore, the electric current of this change can cause earphone to send POP noises.Because the sensitivity of earphone is very high, and earphone sound
The current changing rate positive correlation of sound size and earphone, even if so electric current is smaller in itself, but detection pin produces charge discharging resisting suddenly
The quick change of electric current may also cause significantly to insert noise on path, earphone, so as to influence user to use the experience of earphone.
Utility model content
The utility model provides a kind of earphone detection circuit, to solve to insert moment, ear in earphone in the prior art
The problem of there is noise in machine.
In a first aspect, the utility model provides a kind of earphone detection circuit, including：
Interruption pin and L channel pin on earphone socket；
The interruption pin connection resistance and output end；
The L channel pin is grounded by the metal-oxide-semiconductor component of two-way stop.
Second aspect, the utility model provides a kind of audio frequency apparatus, including：Earphone detection circuit, the headset detection
Circuit includes the interruption pin and L channel pin being located on earphone socket；
The interruption pin connection resistance and output end；
The L channel pin is grounded by the metal-oxide-semiconductor component of two-way stop.
The utility model is grounded by the metal-oxide-semiconductor component at the L channel pin on earphone socket by two-way stop, is made
The electric current that earphone insertion moment produces is released by the metal-oxide-semiconductor component of the two-way stop, it is to avoid the electric current flows through earphone, so that
Eliminate POP noises during earphone insertion.
Described above is only the general introduction of technical solutions of the utility model, in order to better understand skill of the present utility model
Art means, and being practiced according to the content of specification, and in order to allow above and other purpose of the present utility model, feature
It can be become apparent with advantage, below especially exemplified by embodiment of the present utility model.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, below by the utility model embodiment
The accompanying drawing used required in description is briefly described, it should be apparent that, drawings in the following description are only that this practicality is new
Some embodiments of type, for those of ordinary skill in the art, without having to pay creative labor, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of the earphone detection circuit of prior art.
Fig. 2 is the circuit theory diagrams of the earphone detection circuit of the utility model one embodiment.
Fig. 3 be the utility model one embodiment earphone detection circuit in current direction schematic diagram.
Fig. 4 is the structured flowchart of one audio frequency apparatus of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is a part of embodiment of the utility model, rather than whole implementation
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Fig. 2 is the circuit theory diagrams of the earphone detection circuit of the utility model one embodiment.Headset detection shown in Fig. 2
Circuit includes the interruption pin 1 and L channel pin 2 being located on earphone socket 3.
The interruption pin 1 connection resistance R and output end Out, output end Out connection microcontrollers.Interrupt the connection resistance of pin 1
R is used for：When earphone is not inserted into, pin 1 is interrupted vacantly, output end Out output high level；When there is earphone insertion, interrupt on pin 1
Connect under electric current passage, output end Out level can be pulled low.What microcontroller was exported by interrupting output end Out on pin 1
Level change judges whether there is earphone insertion.
The L channel pin 2 is grounded by the metal-oxide-semiconductor component of two-way stop.
In a kind of preferred embodiment of the present utility model, the metal-oxide-semiconductor component of two-way stop includes：First MOS field-effects
Pipe MOS1, the first diode D1, the second metal-oxide-semiconductor field effect transistor MOS2 and the second diode D2.
The grid of the first metal-oxide-semiconductor field effect transistor MOS1 and the second metal-oxide-semiconductor field effect transistor MOS2 grid are connected to control
On end Cont processed.Out mouthfuls of the signal output part of control end Cont connection microcontrollers, for controlling the first metal-oxide-semiconductor field effect transistor
MOS1 and the second metal-oxide-semiconductor field effect transistor MOS2 working condition.
The L channel pin 2 connects the first metal-oxide-semiconductor field effect transistor MOS1 drain electrode.
The source electrode of the first metal-oxide-semiconductor field effect transistor MOS1 connects the source electrode of the first metal-oxide-semiconductor field effect transistor MOS1.
The anode and negative pole of the first diode D1 connects source electrode and the leakage of the first metal-oxide-semiconductor field effect transistor MOS1 respectively
Pole.
The anode and negative pole of the second diode D2 connects source electrode and the leakage of the second metal-oxide-semiconductor field effect transistor MOS2 respectively
Pole.
The grounded drain of the second metal-oxide-semiconductor field effect transistor MOS2.
When no earphone inserts jack 4, microcontroller opens the first metal-oxide-semiconductor field effect transistor by control end Cont controls
MOS1 and the first metal-oxide-semiconductor field effect transistor MOS1, now the L channel pin 2 of earphone socket 3 connect by the metal-oxide-semiconductor component of two-way stop
Ground, due to being not inserted into earphone, the interruption pin 1 of earphone socket 3 is hanging, is moved to by the resistance R of its connection on logic high.
As shown in figure 3, when there is earphone to insert jack 4, the L channel of headset plug can be respectively contacted the interruption of socket
The shell fragment of pin 1 and the shell fragment of L channel pin 2, now interrupt pin 1 and are connected by the L channel pin 2 of headset plug L channel and earphone socket 3
Connect, the L channel pin 2 of earphone socket 3 is directly connected to ground further through metal-oxide-semiconductor component, therefore the path of electric current becomes as by interruption pin
1, from the surface metal of headset plug L channel, flows through metal-oxide-semiconductor component, flows directly into ground.
Because the conducting equivalent resistance R of metal-oxide-semiconductor component is minimum, according to the divided relation of identical voltage, current, now absolutely
Most of electric current can be released by metal-oxide-semiconductor component, noise when no longer being inserted on earphone, and due to interrupting under pin 1 has
Ground path, interrupting the level of pin 1 can also successfully be pulled low, so that microcontroller is tested with earphone insertion.When being tested with
When earphone is inserted, the first metal-oxide-semiconductor field effect transistor MOS1 and second that microcontroller is closed in metal-oxide-semiconductor component by control end Cont again
Metal-oxide-semiconductor field effect transistor MOS2, now, normal music signal can pass to earphone by headset plug.
In embodiments of the present invention, the control end Cont is grounded by electric capacity C.The electric capacity C of connection is slowly to release
Electric charge, prevents from opening that metal-oxide-semiconductor component speed is too fast regenerates noise.
In a kind of preferred exemplary of the embodiment of the present invention, distance of the pin 1 apart from the bottom of earphone jack 4 is interrupted pre- for first
If length, distance of the L channel pin 2 apart from the bottom of earphone jack 4 is the second preset length, and the first preset length is less than the
Two preset lengths.To ensure during earphone insertion, after headset plug L channel is first grounded, then to touch powered interruption pin 1.
It should be noted that producing non-linear mistake when playing music in order to avoid the parasitic body diode of metal-oxide-semiconductor component
Very, it is necessary to choose the metal-oxide-semiconductor component with two-way stop, to ensure during earpiece audio signal intensity, metal-oxide-semiconductor component is in cuts all the time
Only state.
Fig. 4 is the structured flowchart of one audio frequency apparatus of the utility model.Audio frequency apparatus shown in Fig. 4 includes earphone interface
41st, earphone detection circuit 42 and microcontroller 43.Earphone interface 41 connects earphone detection circuit 42, and earphone detection circuit 42 is connected
Microcontroller 43.
The earphone detection circuit 42 includes the interruption pin and L channel pin being located on earphone socket；
The interruption pin connection resistance and output end；Output end connects microcontroller 43.
The L channel pin is grounded by the metal-oxide-semiconductor component of two-way stop.
The metal-oxide-semiconductor component of the two-way stop includes：First metal-oxide-semiconductor field effect transistor, the first diode, the 2nd MOS field-effects
Pipe and the second diode；
The grid of the grid of first metal-oxide-semiconductor field effect transistor and second metal-oxide-semiconductor field effect transistor is connected in control end；Control
End processed connects microcontroller 43.
The L channel pin connects the drain electrode of the first metal-oxide-semiconductor field effect transistor；
The source electrode of first metal-oxide-semiconductor field effect transistor connects the source electrode of first metal-oxide-semiconductor field effect transistor；
The anode and negative pole of first diode connect source electrode and the drain electrode of first metal-oxide-semiconductor field effect transistor respectively；
The anode and negative pole of second diode connect source electrode and the drain electrode of second metal-oxide-semiconductor field effect transistor respectively；
The grounded drain of second metal-oxide-semiconductor field effect transistor.
The control end passes through capacity earth.
The interruption pin pitch is from being the first preset length with a distance from earphone jack bottom, and the L channel pin pitch is from the ear
The distance in machine transplanting of rice bottom hole portion is the second preset length, and first preset length is less than the second preset length.
Audio frequency apparatus is mainly the general name to audio input-output device, and it includes：Power amplifier, audio amplifier, multimedia control
Platform, digital sound console, audio sample card, synthesizer, medium-high frequency audio amplifier, MP3, MP4, mobile terminal etc., and other ambient audios
Equipment.
It should be noted that earphone detection circuit provided in an embodiment of the present invention and the earphone detection circuit base shown in Fig. 2
This is similar, so description is fairly simple, related explanation in related part embodiment shown in Figure 2.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation be all between difference with other embodiment, each embodiment identical similar part mutually referring to.
Although having been described for the preferred embodiment of the utility model embodiment, those skilled in the art once learn
Basic creative concept, then can make other change and modification to these embodiments.So, appended claims are intended to solution
It is interpreted as including preferred embodiment and falls into having altered and changing for the utility model scope of embodiments.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or terminal device including a series of key elements are not only wrapped
Those key elements, but also other key elements including being not expressly set out are included, or also include being this process, method, article
Or the intrinsic key element of terminal device.In the absence of more restrictions, by wanting that sentence "including a ..." is limited
Element, it is not excluded that also there is other identical element in the process including the key element, method, article or terminal device.
A kind of earphone detection circuit provided by the utility model and a kind of audio frequency apparatus are described in detail above,
Specific case used herein is set forth to principle of the present utility model and embodiment, and the explanation of above example is only
It is to be used to help understand method of the present utility model and its core concept；Simultaneously for those of ordinary skill in the art, foundation
Thought of the present utility model, will change in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as to limitation of the present utility model.
Claims (8)
1. a kind of earphone detection circuit, it is characterised in that including the interruption pin and L channel pin on earphone socket；
The interruption pin connection resistance and output end；
The L channel pin is grounded by the metal-oxide-semiconductor component of two-way stop.
2. earphone detection circuit according to claim 1, it is characterised in that the metal-oxide-semiconductor component of the two-way stop includes：
First metal-oxide-semiconductor field effect transistor, the first diode, the second metal-oxide-semiconductor field effect transistor and the second diode；
The grid of the grid of first metal-oxide-semiconductor field effect transistor and second metal-oxide-semiconductor field effect transistor is connected in control end；
The L channel pin connects the drain electrode of the first metal-oxide-semiconductor field effect transistor；
The source electrode of first metal-oxide-semiconductor field effect transistor connects the source electrode of first metal-oxide-semiconductor field effect transistor；
The anode and negative pole of first diode connect source electrode and the drain electrode of first metal-oxide-semiconductor field effect transistor respectively；
The anode and negative pole of second diode connect source electrode and the drain electrode of second metal-oxide-semiconductor field effect transistor respectively；
The grounded drain of second metal-oxide-semiconductor field effect transistor.
3. earphone detection circuit according to claim 2, it is characterised in that the control end passes through capacity earth.
4. earphone detection circuit according to claim 1, it is characterised in that the interruption pin pitch is from earphone jack bottom
Distance is the first preset length, and the L channel pin pitch is described from being the second preset length with a distance from the earphone jack bottom
First preset length is less than the second preset length.
5. a kind of audio frequency apparatus, it is characterised in that the audio frequency apparatus includes earphone detection circuit, the earphone detection circuit bag
Include the interruption pin and L channel pin on earphone socket；
The interruption pin connection resistance and output end；
The L channel pin is grounded by the metal-oxide-semiconductor component of two-way stop.
6. audio frequency apparatus according to claim 5, it is characterised in that the metal-oxide-semiconductor component of the two-way stop includes：First
Metal-oxide-semiconductor field effect transistor, the first diode, the second metal-oxide-semiconductor field effect transistor and the second diode；
The grid of the grid of first metal-oxide-semiconductor field effect transistor and second metal-oxide-semiconductor field effect transistor is connected in control end；
The L channel pin connects the drain electrode of the first metal-oxide-semiconductor field effect transistor；
The source electrode of first metal-oxide-semiconductor field effect transistor connects the source electrode of first metal-oxide-semiconductor field effect transistor；
The anode and negative pole of first diode connect source electrode and the drain electrode of first metal-oxide-semiconductor field effect transistor respectively；
The anode and negative pole of second diode connect source electrode and the drain electrode of second metal-oxide-semiconductor field effect transistor respectively；
The grounded drain of second metal-oxide-semiconductor field effect transistor.
7. audio frequency apparatus according to claim 6, it is characterised in that the control end passes through capacity earth.
8. audio frequency apparatus according to claim 5, it is characterised in that the interruption pin pitch from earphone jack bottom with a distance from
For the first preset length, the L channel pin pitch is from being the second preset length, described first with a distance from the earphone jack bottom
Preset length is less than the second preset length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720097032.7U CN206481457U (en) | 2017-01-24 | 2017-01-24 | A kind of earphone detection circuit and audio frequency apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720097032.7U CN206481457U (en) | 2017-01-24 | 2017-01-24 | A kind of earphone detection circuit and audio frequency apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206481457U true CN206481457U (en) | 2017-09-08 |
Family
ID=59754364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720097032.7U Active CN206481457U (en) | 2017-01-24 | 2017-01-24 | A kind of earphone detection circuit and audio frequency apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN206481457U (en) |
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2017
- 2017-01-24 CN CN201720097032.7U patent/CN206481457U/en active Active
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