CN102780946B - The method of the voltage signal of electronic installation, electronic system and process one periphery accessory - Google Patents
The method of the voltage signal of electronic installation, electronic system and process one periphery accessory Download PDFInfo
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- CN102780946B CN102780946B CN201110119705.1A CN201110119705A CN102780946B CN 102780946 B CN102780946 B CN 102780946B CN 201110119705 A CN201110119705 A CN 201110119705A CN 102780946 B CN102780946 B CN 102780946B
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Abstract
A kind of method of the voltage signal of electronic installation, electronic system and process one periphery accessory.This process is from the method for the voltage signal of a periphery accessory, it is applicable to an electronic installation, this periphery accessory has multiple functional keys, the method includes the following step: when this periphery accessory is connected to this electronic installation, it is provided that one first reference voltage and one second reference voltage give this periphery accessory；When at least one functional keys of the plurality of functional keys is pressed, produce at least one voltage of multiple voltages of corresponding to the plurality of functional keys with this second reference voltage according to this first reference voltage；And determine a pressed functional keys according at least this voltage and a bounce-back jump mechanism.
Description
Technical field
The present invention relates to a kind of electronic installation, electronic system and relevant treatment thereof the method from the voltage signal of a periphery accessory, particularly relate to a kind of apparatus and method utilizing bounce-back jump mechanism to determine pressed functional keys.
Background technology
There is the electronic installation of multi-media player function, such as mp3 walkman, discman, mobile phone, personal digital assistant etc., sound source signal can be play whenever and wherever possible.It is said that in general, this kind of electronic installation all comprises specific audio-visual output interface, to export sound source signal to video-audio playing device.Such as, mp3 walkman includes a source of sound jack, in order to export sound source signal to a source of sound accessory, the such as voice output such as loudspeaker, earphone.
Generally speaking, this source of sound accessory has multiple functional keys, each functional keys may be corresponding to a function, such as: previous head, next, play, suspend, answer the call, the function such as hang up, it is likely to result in erroneous judgement when using and the plurality of functional keys quickly being pressed and misses the change of functional keys, when being pressed into functional keys key1 and key2 the most simultaneously, prior art major part identification is that to be pressed into functional keys be functional keys key2, but user is probably wants pressing function button key1, and it is pressed onto functional keys key2 by mistake.
Additionally, this source of sound jack comprises a mechanical switch, be used for having detected whether a plug (such as: sound source plug) be inserted among this source of sound jack (that is, detect whether this source of sound accessory is connected to electronic installation), wherein this sound source plug may include a L channel end points, one R channel end points, one ground termination points and a functional keys voltage signal end points, when there being arbitrary plug to be inserted among this source of sound jack, in theory, this mechanical switch can be pressed by sound source plug and touch the ground termination points of source of sound jack, now a process circuit of electronic installation may receive a ground voltage (being coupled to earth terminal GND), and judge that this sound source plug has been inserted among this source of sound jack according to this.But, it is inserted in the behavior among this source of sound jack at this plug, this mechanical switch is also possible to touch the functional keys voltage signal end points of source of sound jack, thus, this process circuit of this electronic installation may receive the ground voltage (voltage 0 volt) that functional keys voltage signal end points is transmitted, therefore, just it is mistakenly considered user and has the corresponding functional keys to voltage 0 volt of pressing, in like manner, when there being arbitrary plug to extract to this source of sound jack, it is also possible to cause erroneous judgement, those skilled in the art should be able to will readily appreciate that according to above-mentioned teaching, just repeat no more at this.
Therefore, the most correct signal processed from a source of sound accessory to avoid causing erroneous judgement, actually one of important topic in this field.
Summary of the invention
Therefore, an object of the present invention is a kind of method proposing electronic installation, electronic system and relevant treatment thereof from the signal of a periphery accessory, to solve above-mentioned problem.
The present invention discloses a kind of process method from the signal of a periphery accessory, it is applicable to an electronic installation, this periphery accessory has multiple functional keys, the method includes the following step: when this periphery accessory is connected to this electronic installation, it is provided that one first reference voltage and one second reference voltage give this periphery accessory；When at least one functional keys of the plurality of functional keys is pressed, produce at least one voltage of multiple voltages of corresponding to the plurality of functional keys with this second reference voltage according to this first reference voltage；And determine a pressed functional keys according at least this voltage and a bounce-back jump mechanism.
The present invention also discloses a kind of electronic installation, includes: a source of sound jack, is used for being connected with a periphery accessory with multiple functional keys；One power-supply unit, it is coupled to this source of sound jack, it is used in time being coupled to this electronic installation when this periphery accessory, there is provided one first reference voltage and one second reference voltage to this periphery accessory, wherein when at least one functional keys of the plurality of functional keys is pressed, produce at least one voltage of multiple voltages of corresponding to the plurality of functional keys with this second reference voltage according to this first reference voltage；And a decision circuitry, it is coupled to this source of sound jack, is used for determining a pressed functional keys according at least this voltage and a bounce-back jump mechanism.
The present invention also discloses a kind of electronic system, includes: a periphery accessory, and it has multiple functional keys；And an electronic installation, include: a source of sound jack, be used for being connected with this periphery accessory；One power-supply unit, it is coupled to this source of sound jack, it is used in time being connected to this electronic installation when this periphery accessory, there is provided one first reference voltage and one second reference voltage to this periphery accessory, wherein when at least one functional keys of the plurality of functional keys is pressed, produce at least one voltage of multiple voltages of corresponding to the plurality of functional keys with this second reference voltage according to this first reference voltage；And a decision circuitry, it is coupled to this source of sound jack, is used for determining a pressed functional keys according at least this voltage and a bounce-back jump mechanism.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a first embodiment of electronic installation of the present invention.
Fig. 2 is the schematic diagram of one second embodiment of electronic installation of the present invention.
Fig. 3 A determines the schematic diagram of a first embodiment of this functional keys pressed by the present invention according at least this voltage and a bounce-back jump mechanism.
Fig. 3 B determines the schematic diagram of one second embodiment of this functional keys pressed by the present invention according at least this voltage and a bounce-back jump mechanism.
Fig. 3 C determines the schematic diagram of one the 3rd embodiment of this functional keys pressed by the present invention according at least this voltage and a bounce-back jump mechanism.
Fig. 4 is the schematic diagram of one the 3rd embodiment of electronic installation of the present invention.
Fig. 5 is the schematic diagram of an embodiment of electronic system of the present invention.
Fig. 6 is the flow chart that the present invention processes an example operation of the method for the signal from a periphery accessory.
Fig. 7 is the flow chart that the present invention processes another example operation of the method for the signal from a periphery accessory.
Fig. 8 is the flow chart that the present invention processes another example operation of the method for the signal from a periphery accessory.
Reference numeral explanation
| 100、200、400、500 | Electronic installation |
| 110 | Source of sound jack |
| 120 | Power-supply unit |
| 130、230、430 | Decision circuitry |
| 140、540 | Periphery accessory |
| 50 | Electronic system |
| 232、432 | First detector unit |
| 234、434 | Second detector unit |
| 236、436 | Determining means 2--> |
| 431 | Analog digital converting unit |
| 542 | Bleeder circuit |
| 242、442 | Counting unit |
| 244、444 | Comparing unit |
Detailed description of the invention
Some vocabulary is employed to censure specific element in the middle of the description and claim of the present invention.Should be understood that, hardware manufacturer may call same element with different nouns.In the way of this specification and claims not difference by title is used as distinguishing element, but it is used as the criterion distinguished with element difference functionally." comprising " mentioned in the middle of description and claim in the whole text is an open term, therefore should be construed to " comprise but be not limited to ".It addition, " coupling " word comprises any directly and indirectly electrical connection at this.Therefore, if a first device is coupled to one second device described in literary composition, then represents this first device and can directly be electrically connected in this second device, or be indirectly electrically connected to this second device by other devices or connection means.
Refer to the schematic diagram of the first embodiment that Fig. 1, Fig. 1 are electronic installation 100 of the present invention.As it is shown in figure 1, electronic installation 100 includes (but being not limited to) source of sound jack (jack) 110, power-supply unit 120 and decision circuitry 130.Source of sound jack 110 is used for being connected with a periphery accessory 140 with multiple functional keys, it is noted that in the present embodiment, periphery accessory 140 is as a example by a source of sound accessory, but this and the restrictive condition of non-invention.Power-supply unit 120 is coupled to source of sound jack 110, it is used in time being connected to electronic installation 100 when periphery accessory 140, power-supply unit 120 will provide one first reference voltage Vr1 and one second reference voltage Vr2 to periphery accessory 140, wherein when at least one functional keys of the plurality of functional keys is pressed, periphery accessory 140 just can produce at least one voltage Vd of multiple voltages of corresponding to the plurality of functional keys according to the first reference voltage Vr1 and the second reference voltage Vr2, such as, periphery accessory 140 can produce a dividing potential drop according to the first reference voltage Vr1 and the second reference voltage Vr2, using at least this voltage Vd as the plurality of voltage, but the invention is not restricted to this.Decision circuitry 130 is coupled to source of sound jack 110, is used for jumping (De-Bounce) mechanism according at least this voltage Vd and bounce-back and determines a pressed functional keys.It is to say, the present invention utilizes bounce-back jump mechanism that voltage Vd carries out this functional keys that stable state confirms to be pressed with decision.Note that every foundation at least voltage Vd and bounce-back jump mechanism determines that this functional keys pressed all meets the spirit of the present invention and falls into scope.
Refer to the schematic diagram of one second embodiment that Fig. 2, Fig. 2 are electronic installation 200 of the present invention.The framework of the electronic installation 200 of Fig. 2 is similar with the electronic installation 100 of Fig. 1, and both differences are that the decision circuitry 230 of electronic installation 200 includes one first detector unit 232,1 second detector unit 234 and a determining means 236.First detector unit 232 is used for judging whether the spring of voltage Vd meets predetermined voltage range Vp (such as 0.1V), second detector unit 234 is coupled to the first detector unit 234, it is used for detecting the number of times meeting predetermined voltage range Vp to determine an effective status, determining means 236 is coupled to the second detector unit 234, if voltage Vd is in this effective status, this functional keys pressed is determined according to voltage Vd, note that the second detector unit 234 also comprises counting unit 242 and a comparing unit 244.Counting unit 242 is used for counting the number of times meeting this predetermined voltage range Vp to produce an aggregate-value, comparing unit 244 is coupled to counting unit 242, if this aggregate-value is more than a threshold value TH, determine that voltage Vd is in this effective status, in other words, this effective status represents that voltage Vd is up to a period of time already at stable state.For example, in the present embodiment, first detector unit 232 can constantly judge whether voltage Vd meets predetermined voltage range Vp, if meeting voltage range Vp when of the 1st detection, counting unit 242 then can be recorded as 1 time, after a certain time, first detector unit 232 can carry out the 2nd detection, if meeting voltage range again, counting unit 242 can be recorded as 2 times, by that analogy.Comparing unit 244 can confirm whether counting unit 242 recorded more than such as 5 times (threshold value TH), and determining means 236 just can determine this functional keys pressed.
Illustrate that it follows that give some instances again decision circuitry 200 determines the relevant running of this functional keys pressed according to voltage Vd and bounce-back jump mechanism.Refer to Fig. 3 A, Fig. 3 B and Fig. 3 C, Fig. 3 A determines the schematic diagram of a first embodiment of this functional keys pressed by the present invention according at least this voltage and a bounce-back jump mechanism, Fig. 3 B determines the schematic diagram of one second embodiment of this functional keys pressed by the present invention according at least this voltage and a bounce-back jump mechanism, and Fig. 3 C determines the schematic diagram of one the 3rd embodiment of this functional keys pressed by the present invention according at least this voltage and a bounce-back jump mechanism.
In the present embodiment, being to illustrate as a example by three functional keyss key1, key2, key3, right those skilled in the art is it should be appreciated that the restrictive condition of number this and non-invention of button.These functional keyss key1, key2, key3 are respectively corresponding to multiple application A P1 among electronic installation 200, AP2, AP3.In the present embodiment, first reference voltage Vr1 can be 1.8 volts, and the second reference voltage Vr2 can be 0 volt, it is assumed that when functional keys key1 is pressed, it can be 1.4 volts according to the voltage Vd1 that the first reference voltage Vr1 and the second reference voltage Vr2 produce；When functional keys key2 is pressed, it can be 1 volt according to the voltage V2 that the first reference voltage Vr1 and the second reference voltage Vr2 produce；When functional keys key3 is pressed, it can be 0.6 volt according to the voltage V3 that the first reference voltage Vr1 and the second reference voltage Vr2 produce.nullAs shown in Figure 3A，When sequential T2，First detector unit 232 judges that the spring of voltage Vd1 has met predetermined voltage range Vp，Therefore，First detector unit 232 can constantly judge whether voltage Vd meets predetermined voltage range Vp，Counting unit 242 then can persistently record the number of times meeting this predetermined voltage range Vp to produce this aggregate-value，Until during sequential T3，Comparing unit 244 confirms that this aggregate-value of counting unit 242 recorded more than such as 5 times (threshold value)，Second detector unit 234 just determines that voltage Vd is already at this effective status，According to voltage Vd1, determining means 236 just determines that the functional keys this time pressed is functional keys key1，It should be noted that，When sequential T4，In like manner，First detector unit 232 judges that the spring of voltage Vr1 has met predetermined voltage range Vp，Until during sequential T5，Comparing unit 244 confirms that this aggregate-value of counting unit 242 recorded more than such as 5 times (threshold value)，Second detector unit 234 just determines that voltage Vd is already at this effective status，Therefore，According to voltage Vr1, determining means 236 just determines that the functional keys key1 this time pressed decontrols.Please note, after according to voltage Vd1, determining means 236 determines that the functional keys this time pressed is functional keys key1, decision circuitry 200 does not determines the next functional keys pressed further according to other voltage Vd and bounce-back jump mechanism, even if pressing again button key3 (as shown in Fig. 3 B and Fig. 3 C) in the short time after pressing function button key1, decision circuitry 200 still determines that the functional keys this time pressed is functional keys key1, until after sequential T5, determining means 236 thinks that the functional keys key1 this time pressed decontrols, just can determine pressed functional keys again according to voltage Vd and bounce-back jump mechanism.Please note, in fig. 3 c, even if when sequential T5, second detector unit 234 determines that voltage Vd3 is already at this effective status, but decision circuitry 200 still determines that the functional keys this time pressed is functional keys key1, because, when sequential T3, determining means 236 is it is determined that the functional keys this time pressed is functional keys key1, but also does not detects that pressed functional keys key1 decontrols.In a word, it is judged that circuit 200 can detect functional keys by and the action put just can determine pressed functional keys again according to voltage Vd and bounce-back jump mechanism.
Refer to the schematic diagram of one the 3rd embodiment that Fig. 4, Fig. 4 are electronic installation 400 of the present invention.The framework of the electronic installation 400 of Fig. 4 is similar with the electronic installation 200 of Fig. 2, both are that the decision circuitry 430 of electronic installation 400 also includes an analog digital converting unit 431 for performing an Analog-digital Converter at least voltage Vd to produce a digital voltage Vdi at difference, additionally, one first detector unit 432 in decision circuitry 430, the difference of one second detector unit 434 and a determining means 436 and decision circuitry 420 is that decision circuitry 420 is for processing analog voltage signal, and the first detector unit 432, one second detector unit 434 and a determining means 436 are used for processing the digital voltage signal after Analog-digital Converter.It should be noted that, because digital voltage Vdi is after analog digital converting unit 431 is changed, therefore the analog digital converting unit 431 that resolution is higher can be selected during Analog-digital Converter, consequently, it is possible to this bounce-back jump mechanism can be more accurate when whether the spring judging this voltage meets a predetermined voltage range.
Refer to the schematic diagram of the embodiment that Fig. 5, Fig. 5 are electronic system 50 of the present invention.As it is shown in figure 5, electronic system 50 includes electronic installation 500 and a periphery accessory 540, wherein the framework of electronic installation 500 is similar with the electronic installation 100 shown in Fig. 1, and thus like part will not be described in great detail.In the present embodiment, periphery accessory 540 includes a bleeder circuit 542, and bleeder circuit 542 is used for producing a dividing potential drop, using at least this voltage Vd as the plurality of voltage according to the first reference voltage Vr1 and the second reference voltage Vr2.In this embodiment, bleeder circuit 542 can utilize a resistor voltage divider circuit to carry out implementation, and what each functional keys can be realized by a resistive element and a switch respectively, but the present invention is not limited to this, please note, utilize resistor voltage divider circuit can will readily appreciate that for those skilled in the art to the operating principle producing dividing potential drop, just repeat no more at this.
It should be noted that in above-described embodiment, the first reference voltage Vr1 is greater than the second reference voltage Vr2, and multiple voltage (Vd1, Vd2, Vd3 etc.) is all higher than the second reference voltage Vr2.That is, minimum voltage in multiple voltage Vd also can be more than the second reference voltage Vr2, in other words, the corresponding voltage Vd to feature capability button is the most corresponding to the second reference voltage Vr2 (ground voltage), consequently, it is possible to the problem that mechanical switch causes signal to judge by accident can be avoided source of sound jack comprises.It addition, the included electronic installation of electronic system 50 500 can replace into a new alternate embodiment with electronic installation 100,200,400, this is also subordinate to the category that the present invention is contained.
Furthermore, above-mentioned electronic installation 100,200,400,500 can be a mp3 walkman, a discman, a mobile phone (mobi1ephone), a personal digital assistant (personaldigitalassistant, PDA) a, PDA-phone (PDAphone) or an intelligent mobile phone (smartphone), but the invention is not limited in this, also can be that other has the electronic installation of multi-media player function.
Refer to Fig. 6, Fig. 6 is the flow chart that the present invention processes an example operation of the method for the signal from a periphery accessory, it is adaptable to an electronic installation, and this periphery accessory has multiple functional keys.The method comprise below step (if note that available roughly the same result, then the following step and non-limiting to perform according to the order shown in Fig. 6):
Step S600: start.
Step S610: whether detection periphery accessory is connected to electronic installation.When periphery accessory is connected to electronic installation, perform step 620；Otherwise, repeated execution of steps 610.
Step S620: provide the first reference voltage and the second reference voltage to periphery accessory.
Step S630: judge whether at least one functional keys of multiple functional keys is pressed, when at least one functional keys of the plurality of functional keys is pressed, performs step 640；Otherwise, repeated execution of steps 630.
Step S640: produce at least one voltage of multiple voltages of corresponding to multiple functional keys according to the first reference voltage and the second reference voltage.
Step S650: determine pressed functional keys according at least this voltage and bounce-back jump mechanism.
Step S680: terminate.
About each step shown in Fig. 6 incorporated by reference to each element shown in Fig. 1, i.e. can be appreciated that and how to operate between each element, and for description for purpose of brevity, therefore in Fig. 6, the operation of each step just repeats no more.
Refer to Fig. 7, Fig. 7 is the flow chart that the present invention processes another example operation of the method for the signal from a periphery accessory, it is adaptable to an electronic installation, and this periphery accessory has multiple functional keys.The method comprise below step (if note that available roughly the same result, then the following step and non-limiting to perform according to the order shown in Fig. 7):
Step S600: start.
Step S610: whether detection periphery accessory is connected to electronic installation.When periphery accessory is connected to electronic installation, perform step S620；Otherwise, repeated execution of steps S610.
Step S620: provide the first reference voltage and the second reference voltage to periphery accessory.
Step S630: judge whether at least one functional keys of multiple functional keys is pressed, when at least one functional keys of the plurality of functional keys is pressed, performs step S640；Otherwise, repeated execution of steps S630.
Step S640: produce at least one voltage of multiple voltages of corresponding to multiple functional keys according to the first reference voltage and the second reference voltage.
Step S755: judge whether the spring of this voltage meets a predetermined voltage range.When the spring of this voltage meets this predetermined voltage range, perform step S760；Otherwise, repeated execution of steps S755.
Step S760: counting meets the number of times of this predetermined voltage range and produces an aggregate-value.
Step S765: compare this aggregate-value and a threshold value, when this aggregate-value is more than this threshold value, performs step S770；Otherwise, repeated execution of steps S755.
Step S770: determine this functional keys pressed according to this voltage.
Step S780: terminate.
Please arrange in pairs or groups each element shown in Fig. 2 about each step shown in Fig. 7, i.e. can be appreciated that and how to operate between each element, and for description for purpose of brevity, therefore in Fig. 7, the operation of each step just repeats no more.
Refer to Fig. 8, Fig. 8 is the flow chart that the present invention processes another example operation of the method for the signal from a periphery accessory, it is adaptable to an electronic installation, and this periphery accessory has multiple functional keys.The method comprise below step (if note that available roughly the same result, then the following step and non-limiting to perform according to the order shown in Fig. 8):
Step S600: start.
Step S610: whether detection periphery accessory is connected to electronic installation.When periphery accessory is connected to electronic installation, perform step S620；Otherwise, repeated execution of steps S610.
Step S620: provide the first reference voltage and the second reference voltage to periphery accessory.
Step S630: judge whether at least one functional keys of multiple functional keys is pressed, when at least one functional keys of the plurality of functional keys is pressed, performs step S640；Otherwise, repeated execution of steps S630.
Step S640: produce at least one voltage of multiple voltages of corresponding to multiple functional keys according to the first reference voltage and the second reference voltage.
Step S850: perform an Analog-digital Converter at least this voltage to produce a digital voltage.
Step S855: judge whether the spring of this digital voltage meets a predetermined voltage range.When the spring of this digital voltage meets this predetermined voltage range, perform step S860；Otherwise, repeated execution of steps S855.
Step S860: counting meets the number of times of this predetermined voltage range and produces an aggregate-value.
Step S865: compare this aggregate-value and a threshold value, when this aggregate-value is more than this threshold value, performs step S770；Otherwise, repeated execution of steps S755.
Step S870: determine this functional keys pressed according to this digital voltage.
Step S880: terminate.
Please arrange in pairs or groups each element shown in Fig. 4 about each step shown in Fig. 8, i.e. can be appreciated that and how to operate between each element, and for description for purpose of brevity, therefore in Fig. 8, the operation of each step just repeats no more.
The step of above-mentioned each flow process is only the present invention for feasible embodiment, and the restrictive condition of the unrestricted present invention, and in the case of the spirit of the present invention, these methods can also comprise other intermediate steps or several steps can be merged into one step, to do suitable change.
Embodiment described above is only used for illustrating the technical characteristic of the present invention, is not used for limiting to scope of the invention.From the foregoing, it will be observed that the present invention provides a kind of electronic installation, electronic system and relevant treatment thereof from the method for the voltage signal of a periphery accessory.First, the present invention utilizes bounce-back jump mechanism can correctly determine pressed functional keys, additionally, utilize digital voltage to perform bounce-back jump mechanism and can more accurately determine pressed functional keys, furthermore, multiple voltages (Vd1, Vd2, Vd3 etc.) are all higher than the second reference voltage Vr2 (ground voltage) can avoid the problem of mechanical switch caused signal erroneous judgement in source of sound jack.
The foregoing is only presently preferred embodiments of the present invention, equalization change and the modification that all claim under this invention is done, all should belong to the covering scope of the present invention.
Claims (9)
1. a voltage signal processing method, the method is to perform on the electronic installation coupling a periphery accessory, and this periphery accessory has multiple functional keys, and the method includes:
There is provided one first reference voltage and one second reference voltage to this periphery accessory；
Dividing potential drop is produced, using at least one voltage of the multiple voltages as correspondence to the plurality of functional keys according to this first reference voltage and this second reference voltage；
Determine that the spring of this at least one voltage meets a predetermined voltage range；
Count this at least one voltage and meet the number of times of this predetermined voltage range to produce an aggregate-value；
Relatively this aggregate-value and a threshold value, if this aggregate-value is more than this threshold value, determines that this at least one voltage is in an effective status；And
If this at least one voltage is in this effective status, determine a pressed functional keys according to this at least one voltage.
2. the method for claim 1, wherein determines that the spring of this at least one voltage meets the step of this predetermined voltage range and includes:
Perform an Analog-digital Converter in this at least one voltage to produce at least one digital voltage；And
Determine that the spring of this at least one digital voltage meets this predetermined voltage range.
3. the method for claim 1, wherein this first reference voltage is more than this second reference voltage, and the plurality of voltage is all higher than this second reference voltage.
4. an electronic installation, includes:
One source of sound jack, is connected with a periphery accessory with multiple functional keys；
One power-supply unit, it is coupled to this source of sound jack, there is provided one first reference voltage and one second reference voltage to this periphery accessory, wherein this periphery accessory produces dividing potential drop according to this first reference voltage and this second reference voltage, using at least one voltage of the multiple voltages as correspondence to the plurality of functional keys；And
One decision circuitry, is coupled to this source of sound jack, and this decision circuitry includes:
One first detector unit, is used for confirming that the spring of this at least one voltage meets a predetermined voltage range；
One second detector unit, is coupled to this first detector unit, and this second detector unit includes:
One counting unit, counting meets the number of times of this predetermined voltage range to produce an aggregate-value；And
One comparing unit, is coupled to this counting unit, and this comparing unit compares this aggregate-value and a threshold value, if this aggregate-value is more than this threshold value, determines that this at least one voltage is in an effective status；And
One determining means, is coupled to this second detector unit, if this at least one voltage is in this effective status, this determining means determines a pressed functional keys according to this at least one voltage.
5. electronic installation as claimed in claim 4, wherein this decision circuitry also includes:
One analog digital converting unit, is used for performing an Analog-digital Converter in this at least one voltage to produce at least one digital voltage, to replace this at least one voltage.
6. electronic installation as claimed in claim 4, wherein this first reference voltage is more than this second reference voltage, and the plurality of voltage is all higher than this second reference voltage.
7. an electronic system, includes:
One periphery accessory, it has multiple functional keys；And
One electronic installation, includes:
One source of sound jack, is used for being connected with this periphery accessory；
One power-supply unit, it is coupled to this source of sound jack, it is used in time being connected to this electronic installation when this periphery accessory, there is provided one first reference voltage and one second reference voltage to this periphery accessory, wherein periphery accessory produces dividing potential drop according to this first reference voltage and this second reference voltage, using at least one voltage of the multiple voltages as correspondence to the plurality of functional keys；And
One decision circuitry, is coupled to this source of sound jack, and this decision circuitry includes:
One first detector unit, is used for confirming that the spring of this at least one voltage meets a predetermined voltage range；
One second detector unit, is coupled to this first detector unit, and this second detector unit includes:
One counting unit, counting meets the number of times of this predetermined voltage range to produce an aggregate-value；And
One comparing unit, is coupled to this counting unit, and this comparing unit compares this aggregate-value and a threshold value, if this aggregate-value is more than this threshold value, determines that this at least one voltage is in an effective status；And
One determining means, is coupled to this second detector unit, if this at least one voltage is in this effective status, this determining means determines a pressed functional keys according to this at least one voltage.
8. electronic system as claimed in claim 7, wherein decision circuitry includes:
One analog digital converting unit, is used for performing an Analog-digital Converter at least this at least one voltage to produce at least one digital voltage, to replace this at least one voltage.
9. electronic system as claimed in claim 7, wherein this periphery accessory includes:
One bleeder circuit, it is used for producing this dividing potential drop according to this first reference voltage and this second reference voltage, using this at least one voltage as the plurality of voltage, wherein this first reference voltage is more than this second reference voltage, and the plurality of voltage is all higher than this second reference voltage.
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