CN1781221A - Universal audio jack and plug - Google Patents

Abstract

A universal four-contact plug and jack assembly permits interconnection of microphone and stereo audio signals between an audio peripheral incorporating the four-contact plug and an audio device that includes the four-contact jack. Dimensionally, the interconnecting segments of the four-contact plug are, in terms of overall length, consistent with standard three-contact audio plugs which allows the four-contact plug to be plugged into a three-contact jack intended for use with conventional three-contact audio plugs. Similarly, the four-contact jack has three of its contacts positioned as a conventional three-contact jack but with a fourth contact position to interconnect with the additional contact of four-contact plugs. With this configuration, an audio device including the four-contact plug is compatible with audio peripherals including stereo headsets, monaural headsets with microphones, and others.

Description

Universal audio jack and plug

Related application

According to 35U.S.C. § 119 (e), the application requires following U.S. Provisional Application No.: application number 60/452212, March 5 2003 applying date.By reference that part application entirely is combined in this.

Background technology

The field of the invention relates generally to audio connector, relates to particularly with standard 3 contact jack and plug and keeps compatible 4 contact jack and plug.

In consumer's audio frequency and telecommunication products, usually use standard audio plug and jack.Most of people are very familiar to audio jack, and representational audio jack comprises a series of cylindrical segments at " end " section electric insulation that finishes.More specifically, the body of plug generally includes tube, ring and terminating end.When usually using in voice applications, tube-ring-end audio jack nomenclature gets that period that the operator of free early stage telephone exchange uses the plug of similar design.Really, such plug is commonly referred to as " phone " plug, although they are used for voice applications the most commonly.2.5mm and the 3.5mm audio jack and the jack of many manufacturers (for example SWITCHCRAFT) production standard.The prevailing purposes of some of audio jack comprises the terminal of the audio interface plug wire of head-telephone/headset cable, microphone cable, guitar cable and other types.

Audio jack generally is used for stereo and the monophonic device.For example, stereo headphones (for example can insert the earphone of WALKMAN or other portable audios) comprises audio-plug terminated cable typically.In the common electrical configuration of stereophonic peripherals, the loud speaker on left side lead attachment plug end, the loud speaker on the right is wired to the plug ring, and plug sleeve connects with plaing a part.Certainly, audio devices comprises the audio jack with interior contact, and it is arranged to selectively to contact tube, ring and the end of the plug of insertion.

As the application that is used for phone commonly, the phone headphone does not need stereo.Such headphone comprises monophonic loud speaker that is used for audio frequency output and the microphone that is used for the audio frequency input typically.In addition, headset cable ends at standard 3 contact audio plug typically, and for example, microphone is wired to plug end, and loud speaker is wired to the plug ring, and the ground of headphone is wired to the tube of plug.In addition, corresponding audio devices will comprise standard audio jack, and the latter comprises the interior contact of suitably arranging.

Because the size and the representational line graph of this audio jack and jack combination are the relative standardizations, there is the compatibility of intersection manufacturer.For example, be the headphone manufacturer that its various headphone models adopt the industry standard audio plugs, can relatively guarantee these headphones will with the audio devices compatibility of other manufacturers.Therefore, use standardized plug and socket to dispose important promotion to manufacturer.

Summary of the invention

The present invention includes provides the audio jack that strengthened and the method and apparatus of plug, and it provides the other feature that interconnects in the compatibility that keeps with existing standardization audio jack and jack.In an exemplary embodiment, four contact audio jack that audio devices has comprised with the enhancing of the ancillary equipment compatibility of audio peripheral device that uses four contact audio plug strengthened accordingly and use standard three contact audio plug.Similarly, the audio peripheral device of four contact audio plug that strengthened of equipment is compatible with the audio devices that uses corresponding four contact audio jack and those audio devices of use standard three contact jack.For example, can comprise according to the exemplary audio ancillary equipment that comprises four contact audio plug of the present invention stereosonic two loud speakers and microphone are provided.

Comprise four orderly sections according to four contact plug of the present invention, comprise end, first ring, second ring and tube.Can make the size of four contact plug consistent, can insert three contact jack and four contact jack once it with any standard size of three contact plug.In exemplary layout, the positioned adjacent tube and second ring, and the length of the tube and the second ring combination equals the length of the tube in three contact audio plug of similar size substantially.When using in the audio peripheral device that microphone and two loud speakers are being arranged, the end of plug is electrically connected to microphone, and first ring is electrically connected to first loud speaker, and second ring is electrically connected to second loud speaker, and tube is electrically connected to ground.Use this configuration, plug is coupled to the audio output circuit of device to the insertion of four contact jack of the audio devices of compatibility the loud speaker of ancillary equipment, the audio frequency input circuit (MIC input) of device is coupled to microphone, and the coupling of proper device ground peripherally.The exemplary physical of four contact plug and electricity configuration and standard three contact jack compatibilities.

Comprise the contact of four separation that are arranged according to four contact audio jack of the present invention, make the corresponding section of four contact audio plug of single female contact and compatible size suitably interconnect, keep three contact plug compatibilities simultaneously with similar size.Therefore, the contact of locating the tube of four contact plug and second ring respectively with the section of the tube of four contact plug and second ring or with three contact plug tin section be connected individually.Similarly, physically arrange the contact of first ring of four contact jack, so that it contacts with the single ring section of three contact plug with the first ring section of four contact plug.At last, arrange terminal contacts with suitably with the end in contact of three and four contact plug.

Comprise four contact jack audio devices example circuit arrangement with jack first and second the ring contacts (for example connect first and second audio output circuits, stereo output), the microphone input is connected to the terminal contacts of jack, and the tube contact that is connected to jack with installing.Use this layout, four contact jack and audio peripheral device (for example stereo formula telephone receiver ancillary equipment and the microphone/speaker headsets worn) compatibility of using three contact plug.

The electronic installation of many types and ancillary equipment can be benefited by comprising jack and the plug that has strengthened of the present invention.For example, portable communication appts (for example travelling carriage) audio frequency output and microphone input function can be merged into single enhancing audio jack.Comprise the audio jack that strengthened thereby space that can saves valuable and reduce cost, also allow this device to keep back compatible with the audio peripheral device of use three contact plug.Similarly benefit is promoted the audio peripheral device that combines with the audio jack that has strengthened, because the audio jack that these ancillary equipment have strengthened with use or work with standard three contact audio jack.

Description of drawings

Figure 1A-conventional the audio peripheral device of 1C explanation, its corresponding plug and corresponding plug-jack schematic illustrations.

Fig. 2 A-2B illustrates the audio peripheral device that another is conventional, its corresponding plug and corresponding plug-jack schematic illustrations.

Fig. 3 A-3B illustrated example audio peripheral device, it comprises the exemplary embodiment of four contact enhance audio plug of the present invention.

Fig. 4 is the details drawing of four contact audio plug of the present invention, and the exemplary dimensions with respect to standard three contact audio plug is described.

Fig. 5 is the block diagram that four contact audio plug of the present invention and conventional three contact plug is disposed juxtaposed illustrative arrangement.

Fig. 6 is the more detailed diagram of exemplary four contact plug and prong configuration, and the details of the exemplary circuit of the electronic installation that combines with exemplary four contact jack of explanation.

Fig. 7 A-7B and 8A-8B explanation are according to the exemplary application of exemplary four contact jack of the present invention.

Fig. 9 detects and responds the figure that three contact audio plug are inserted the exemplary circuit of exemplary four contact jack.

Embodiment

The audio peripheral device of many types uses standardized audio jack for interconnecting with separately audio devices.For example, Figure 1A illustrates that audio peripheral device 10 comprises loud speaker 12, microphone 14 and standardization three contact audio plug 16, and it provides and being connected of ground, loud speaker and the microphone of audio devices (do not have demonstration) in the application of explanation.For this discussion, those skilled in the art will recognize that according to any " standard " size, for example 2.5mm or 3.5mm industry standard size dispose audio jack 16 typically.

Figure 1B illustrates in greater detail audio jack 16.Audio jack 16 comprises the section of three electric insulations, is called tube 18, ring 20 and holds 22 at this.To the plug size of any one standard, tube 18 has concrete segment length d ₁, ring 20 has concrete segment length d ₂, and the distance of the beginning from the beginning of tube 18 to end 22 has corresponding standard apart from d _TFrom another kind of mode, apart from d _TThe pattern length of expression tube 18 and ring 20.Certainly, end 22 has the corresponding standard yardstick, so that total plug length is consistent with diameter to whole manufacturers.

Exemplary interconnecting between the electric insulation section of Fig. 1 C explanation plug 16 and the acoustic component of audio peripheral device 10.Shown in Fig. 1 C, end 22 is electrically connected to microphone 14, and ring 20 is electrically connected to loud speaker 12, and tube 18 is electrically connected to peripheral ground 24.According to the configuration of first audio devices, Fig. 1 C further provides the graphic expression of standard three contact audio jack 26.Jack 26 comprises a contact 28, ring contact 30 and terminal contacts 32.For with the compatibility of the function of the wiring of the plug 16 that on audio peripheral device 10, uses, the terminal contacts 32 of jack is connected to the input of microphone, ring contact 30 is connected to loud speaker output, and tube contact 28 is connected with suitable circuit ground.

Fig. 2 A illustrates another audio peripheral device 34, and it uses audio jack 16, but is used in the stereo headset configuration.Audio peripheral device 34 is to comprise the stereo headset that two of stereo audio loud speaker 12-1 and 12-2 are provided.Therefore, plug 16 is connected to two loud speakers (rather than a loud speaker) and microphone with lead, shown in audio peripheral device 10.

Fig. 2 B provides the graphic extension to ancillary equipment 34, comprises plug 16, and standard three contact jack 26 in the configuration of complementary electricity.As shown, loud speaker 12-1 is connected to the end 22 of plug 16, and loud speaker 12-2 is electrically connected to the ring 20 of plug 16, and ancillary equipment ground 24 is electrically connected to the tube 18 of plug 16.Jack 26 has compatible configuration.The terminal contacts 32 of jack 26 is connected to the output of left speaker, and ring contact 30 is connected to the output function of right loud speaker, and tube contact 28 is connected to ground.Therefore, plug 16 makes end 22 and terminal contacts 32, ring 20 interconnect with tube contact 28 with ring contact 30 and tube 18 to the insertion of jack 26.

By increasing the 4th section, the present invention has developed the three above-mentioned contact plug and the adaptability of prong configuration.For example, have extra section, in single plug/jack combination, allow to comprise stereo audio output and microphone input function.Yet, comprise and new functionally preferably should not make new four contact plug configuration incompatible with standard three contact jack, should not make new four contact jack configuration incompatible with standard three contact plug yet.

The audio peripheral device 40 of Fig. 3 A illustrated example, for example spendable in hands-free telephone.Audio peripheral device 40 comprises boombox 12-1 and 12-2, and microphone 14.In this exemplary embodiment, the line of loud speaker 12 and microphone 14 ends at four contact audio plug 42.Fig. 3 B illustrates the second exemplary audio ancillary equipment 44, and it is also included within microphone 14 and a pair of loud speaker 12 that plug 42 stops, and still, the physical layout of audio peripheral device 44 is more suitable in for example computer based voice applications.

Fig. 4 is described in more detail the exemplary embodiment of four contact audio plug 42.Plug 42 comprises four sections, comprises tube 46, the first and second rings 48 and 50 respectively, and holds 52.In order to keep compatible with standard three contact audio jack, total yardstick of plug 42 preferably with the consistent size of any standard audio plug.In addition, the ring 50 of configuration tube 46 and adjacency is to have the segment length (d of combination ₃+ d ₄), it equals the segment length d of the tube 18 in three contact audio plug 16 of similar size substantially ₁Similarly, configuration tube 46 and ring 48 and 50 (d ₂+ d ₃+ d ₄) total length d _TTo have the essentially identical total length that adds the combination of ring 20 as the tube 18 of three contact audio plug 16.Similarly, same or similar on end 22 yardsticks of the end 52 of configuration plug 42 and plug 16.

The physical configuration of plug 42 recited above is guaranteed and standard three contact jack 26 physics compatibilities.Certainly, the electric compatibility between plug 42 and the jack 26 depends on the electricity configuration of plug 42.Fig. 5 illustrates the wiring realization of the exemplary wiring details of plug 42 to the installation of the various configurations of three contact audio plug 16.For example, configuration 16-1 meets the wiring of using with the previous audio peripheral device of describing that comprises loud speaker 12 and microphone 14 10, disposes 16-2 simultaneously and meets the wiring of using with the audio peripheral device 34 that comprises stereo speakers 12.Therefore, in 16-1, end 22 is that microphone output connects, and ring 20 is that the loud speaker input connects, and tube 18 is that ground (returning) connects.In 16-2, end 22 is that the input of first loud speaker connects, and ring 20 is that the input of second loud speaker connects, and tube 18 is that ground (returning) connects.Compare, in the exemplary electrical configuration of plug 42, end 52 is connected to microphone 14, and ring 48 is connected to the first loud speaker 12-1, and ring 50 is connected to the second loud speaker 12-2, and tube 46 is connected to and peripherally connects 54.

Use this exemplary electrical configuration, shown in Fig. 1 C and 2B, audio jack 42 is kept with the representational electric electricity that disposes of three contact audio jack 26 compatible.For example, plug 42 causes holding 52 to be connected with terminal contacts 32 (MIC input) to the insertion of the jack 26 of Fig. 1 C, and ring 48 is connected with ring contact 30 (loud speaker output), and tins 46 with a contact 28 () be connected.Second ring of plug 42 promptly encircles 50 and can keep electricity not connect, and still, will pass through the tube contact 30 electric cross-over connections of plug 26 probably, so that it and tube 46 short circuits.Yet to audio peripheral device 40 or 44, such cross-over connection only causes one harmless ground connection among loud speaker 12-1 and the 12-2.Similarly, plug 42 causes holding 52 to be connected with terminal contacts 32 (loud speaker output) to the insertion of the jack 26 of Fig. 2 B, and ring 48 is connected with ring contact 30 (loud speaker output), and tins 46 with a contact 28 () be connected.In addition, can electric jumper ring 50 by the tube contact 30 of plug 26, so that it and tube 46 short circuits.

Notice that the loud speaker output that the insertion of the jack 26 of any in plug 42 prong configuration upward causes at least one peripheral loud speaker 12 to be connected in the jack connects, thereby the functional of audio frequency output is provided.In addition, even be incorrect on the function, other plug is harmless to interconnecting of jack.Therefore, the standard wiring of four contact plug 42 and three contact jack 26 configuration is compatible.

The exemplary audio device 60 that Fig. 6 explanation combines with four contact audio jack 62 of the present invention is for use for example previous ancillary equipment of describing 40 and 44 with the audio peripheral device that combines exemplary four contact plug 42.Jack 62 comprises 64, the first and second ring contacts 66 and 68, a contact, and terminal contacts 70.In the exemplary configuration of jack 62, the ground that tube contact 64 is connected to audio devices 60 connects 72, ring contact 66 is connected to the first audio output circuit 74-1, and ring contact 68 is connected to the second audio output circuit 74-2, and terminal contacts 70 is connected to audio frequency input circuit 76.In order to discuss, exemplary audio output circuit 74 respectively comprises amplifier 80, and digital to analog converter (DAC) 82.Exemplary audio input circuit 76 comprises amplifier 84, and its input is coupled to end 70 by input filter 86, and analog to digital converter (ADC) 88 is coupled in its output.

ADC 88 provides digitized microphone input signal to one or more additional treatment circuits, generally is called adjunct circuit 90 at this.Those technical staff in the present technique field will recognize, these adjunct circuits 90 will change with the purposes of the expection of audio devices 60.For example, if audio devices 60 is mobile communications devices, adjunct circuit 90 will comprise typically that one or more microprocessors, various RF communicate by letter and input/output circuitry with other.Do not need such details for understanding the present invention, and will no longer probe into.Really, comprise DAC82 and ADC 88 and presuppose adjunct circuit 90 processing digital audio and video signals, still, this hypothesis and the present invention do not have substantial connection, and should be appreciated that, if only in the analog domain operation, can omit such converter from installing 60.

No matter the realization details of audio devices 60, select exemplary electrical configuration and audio jack 42 compatibilities of jack 62, and dispose back compatible with the representational electricity of standard three contact audio plug 16.Similarly, the contact of being coupled to the ring 66 of jack 62 from the audio output signal of audio output circuit 74-1, and from ring contact 68 couplings of audio output signal and the jack 62 of audio output circuit 74-2.At last, the terminal contacts 70 of jack 62 is coupled in the input of the audio frequency of audio frequency input circuit 76.

Except that this electricity is arranged, physically arrange or otherwise the various contacts of positioning jack 62 so that the physically audio jack 16 inserted of contact and 42 corresponding section in the way you want.For with three contact plug, 16 compatibilities, locating ring contact 68 is so that tins 18 being connected of it and tube contact 64 and three contact plug 16.In other words, ring contact 66 is connected with the ring 20 of three contact plug 16 and the ring 48 of four contact plug 42, and still, ring contact 68 is connected with corresponding ring when inserting plug 42, and is connected with tube when inserting plug 16.Therefore, when three contact plug 16 were inserted jack 62, the ground connection (tube connects) that causes from the output of audio output circuit 74-2 was arranged in this contact.Yet about output circuit 74-2, such ground connection generally is harmless.The exemplary application of the audio jack 62 that Fig. 7 A and 7B explanation are used in computer installation.In Fig. 7 A, computer 100 comprises sound card 102, and it comprises stereo input jack 104 and exemplary four contact audio jack 62.Sound card 102 comprises voicefrequency circuit typically, and it is similar to those that describe in the ordinary audio device 60 of Fig. 6, thereby jack 62 provides the stereo output of the combination that has the microphone input.By convention, sound card 102 will comprise three jacks, be used for the jack that separates of stereo input, microphone input and stereo output.Yet owing to comprise jack 62, stereo output and microphone input function (perhaps stereo input adds microphone function) are combined into single jack.For example, the audio peripheral device 44 of Fig. 3 B can be inserted into jack 62, therefore, and the microphone 14 (being also included within on the sound card 102) that interconnects loud speaker 12-1 and 12-2 and audio output circuit (being included on the sound card 102) and have the microphone input circuit.

The purposes of audio jack 62 not only allows on single face point so multi-link, and its use does not allow sound card 102 to keep and uses the audio peripheral device compatibility of type early of the standard configurations (for example those shown in Figure 1A and the 2A) of three contact audio plug 16.According to exemplary physical arrangement in the female contact of jack 62 illustrated in fig. 6, standard three contact plug 16 are to the insertion of jack 62, the tube 18 that makes the first ring contact 66 of ring 20 and jack of contact 70, plug of the end 22 of plug and jack and plug and the tube contact 64 of jack and interconnect with the second ring contact 68 of jack typically.

In order to understand the back compatible of above-mentioned four contact arrangement better, more as shown in Figure 5 arrange exemplary schematic illustration with jack 62 shown in Figure 6 disposing wiring that 16-1 neutralization and audio peripheral device 34 (boombox) dispose the plug 16 among the 16-2 accordingly accordingly with audio peripheral device 10 (microphone+loud speaker).For the configuration 16-1 of plug 16, audio peripheral device 10 inserts audio devices 60 via jack 62 and suitably the microphone 14 of audio peripheral device 10 is connected to audio frequency input circuit 76, and loud speaker 12 suitably is connected to audio output circuit 74-1.As noticing previously, audio output circuit 74-2 can harmlessly be grounding to the tube 18 of plug 16.

For configuration 16-2, audio peripheral device 34 inserts audio devices 60 via jack 62 loud speaker 12-1 is connected to audio frequency input circuit 76 (it is harmless), and loud speaker 12-2 suitably is connected to audio output circuit 74-1, and the ground 24 of audio peripheral device 34 is connected to the ground 72 of audio devices 60.Therefore, when not having power supply for one in two loud speakers 12 that allow in the ancillary equipment 34, what offer the user is at least one audio frequency output channel, and does not cause damage to ancillary equipment 34 or to audio devices 60.In addition, will be in greater detail as the back, configurable audio devices 60 is to make the audio frequency output of distinguishing and revise in response it between three and four contact audio plug.For example, if audio devices 60 detects the insertion of plug 16, its renewable signal from audio output circuit 74-1 output is so that it changes to the combination stereo channel from monophony.

Perhaps, the universal compatibility of jack 62 has even bigger value in the application of limited space.Fig. 7 B explanation is in the use of laptop computer 106 audio jack 62.Here, the combination microphone is more easily obvious with the advantage that the output loud speaker is connected in same jack, because in representational laptop design, peripheral connector space is extremely paid attention to.The application of the limited space similarly of Fig. 8 A explanation audio jack 62, wherein it is included in the travelling carriage 110, and it can be little cell phone or PDA(Personal Digital Assistant), and eliminating peripheral connector at that has significant values.Fig. 8 B illustrates interconnecting between the hands-free communication ancillary equipment 112 that comprises loud speaker 12-1 and 12-2 and microphone 14, and wherein based on the insertion of audio jack 42 to jack 62, ancillary equipment 112 interconnects with travelling carriage 110.Therefore, the exemplary configuration of four contact plug 42 and corresponding four contact jack 62 provides the application of spatial key, for example is useful on the mobile phone of a connector solution of hands-free communication ancillary equipment.

Notice that as top in one or more its standard wiring were arranged, the insertion of three contact audio plug 16 caused the audio output circuit 74-2 ground connection of audio devices 60, as the result of the physical positioning of the ring contact 68 in the jack 62.That is exactly, and the segment length of the tube 18 in the plug 16 makes ring contact 68 be connected with tube 18, and relies on a contact 64 of jack 62 also to be connected with tube 18, and encircle contact 68 and become ground connection, thereby with audio output circuit 74-2 ground connection.If such ground connection is undesirable, audio devices 60 can detect ground connection and suitably response.

Fig. 9 explanation is used to detect and respond the example circuit arrangement of voicefrequency circuit ground connection.Certainly, those skilled in the art will be understood that layout shown in Figure 9 only is exemplary, can adopt other circuit arrangement to reach similar effect.

In Fig. 9, audio devices 60 comprises audio output circuit 74-1 and 74-2 and audio frequency input circuit 76, as previously mentioned but made and revised comprising short-circuit control circuit 120, and optionally, audio control circuit comprises circuit unit 128 and 130.Short-circuit control circuit 120 (for example comprises transducer 122, it can be configured to as electric current and/or voltage sensor) and control logic 124, control logic 124 is as receiving from the ring contact 68 of the expression jack 62 of transducer 122 and tube contact 64 short circuit indicant or other signals together whether.

If the contact short circuit together, control logic 124 makes switch 126, and it is digital control switch, and it is opened audio output circuit 74-2 and encircles being connected between the contact 68.Just, short-circuit control circuit 120 can be configured to when detecting ring contact 68 short circuits or not so disconnecting audio output circuit 74-2 from jack 62 during ground connection.

When voicefrequency circuit 74-2 when jack 62 disconnects, for conserve energy, control logic 124 can further be moved to close or not so to forbid the amplifier 80 of voicefrequency circuit 74-2.Notice that amplifier 80 can be such, it shows high impedance output promptly no matter when to forbid it.If like this, can omit switch 126, and the amplifier 80 of audio output circuit 74-2 only is in high impedance status, the short circuit between response detection tube contact 64 and the ring contact 68.

In addition, if forbid or not so disconnect voicefrequency circuit 74-2, hope be the content of regulating by the remaining audio signal of audio output circuit 74-1 output.Therefore, when the ring contact 68 of jack 62 did not have short circuit, audio output circuit 74-1 and 74-2 preferably provided a left side and right stereo output signal.Yet when ring contact 68 short circuits and stereo output were unavailable, audio devices 60 scalable were from the audio signal of audio output circuit 74-1, so that it comprises a left side and the right channel information of combination, or not so regulated it and were the suitable monophonic pattern that is used for.

Available any amount of mode is finished such audio frequency output and is regulated, for example, by control multiplexer 128 so that it on stereo channel of first state output (left side or right any), and a left side that provides in the output of second state as by adder 130 and the summation of right stereophonic signal.Can use control logic 124 to come the state of the multiplexer 128 of control response transducer 122.Perhaps, adjunct circuit 90 can comprise signal processor or other signal processing circuits, and it only forms the audio content (when needing) of the audio signal of being amplified by voicefrequency circuit 74-1 again.Such method will be eliminated the needs to multiplexer 128 and adder 130.

In a word, the present invention has defined exemplary electrical and configuration physics of four contact audio plug and jack, when as plug and jack to the time, it provides strengthened interconnective functional, but each keeps the back compatible with standard three contact jack and plug configuration.Though top details is represented the jack invented and the exemplary configuration and the application of plug configuration, such details is not restriction.Really, the present invention is only by following claim and the reasonably scope restriction of equivalent thereof.

Claims (22)

1. One kind with the interconnective jack of three and four contact audio plug, described jack comprises:

   First contact is arranged to contact with first section of four contact audio plug with three;

   Second contact is arranged to contact with second section of four contact audio plug with three;

   The 3rd contact is arranged to contact with the 3rd section of four contact audio plug with three;

   The 4th contact is arranged to contact with the 3rd section of three contact audio plug with four contact audio plug the 4th section.
2. 2. jack as claimed in claim 1, wherein arrange first, second with the 3rd female contact to contact end, ring and tube respectively as the plug of described first, second and the 3rd section of three and four contact plug.
3. 3. jack as claimed in claim 2, the 4th contact of wherein arranging described jack is with second ring of contact as four described the 4th section contact audio plug, and the tube of three contact audio plug.
4. 4. jack as claimed in claim 1, wherein first, second of three contact plug comprises end section, ring section and a section respectively with the 3rd section, so that first contact of described jack is connected to described end section, second contact is connected to described ring section, and the 3rd contact is connected to described tube section.
5. 5. jack as claimed in claim 4, wherein first, second, third of four contact plug and the 4th section comprises end section, the first ring section, the second ring section and tube section respectively, so that first contact of described jack is connected to described end section, second contact is connected to the first ring section, the 3rd contact is connected to described tube section, and the 4th contact is connected to the second ring section.
6. 6. jack as claimed in claim 1, wherein said jack is connected to the voicefrequency circuit that comprises microphone input and stereo audio output, and wherein described microphone input is coupled in first contact, one in the described stereo output is coupled in second contact, the circuit ground of described voicefrequency circuit is coupled in the 3rd contact, and other stereo audio output is coupled in the 4th contact.
7. 7. jack as claimed in claim 6, wherein first contact connects by the audio jack of inserting described jack and is coupled to microphone in the audio peripheral device of described voicefrequency circuit, second is connected the loud speaker in the described audio peripheral device with the 4th contact, and the 3rd contact connects the ground of described audio peripheral device.
8. 8. plug with three and four contact audio jack compatibilities, described plug comprises:

   The end section is arranged to contact with the terminal contacts of four contact audio jack with three;

   The first ring section is arranged to contact with the ring contact of four contact audio jack with three;

   The second ring section is arranged to contact with the second ring contact of four contact audio jack; And

   The tube section is arranged to contact with the tube contact of four contact audio jack with three.
9. 9. plug as claimed in claim 8 wherein first encircles the directly described end section of adjacency of section, and encircles the arrangement second ring section between the section in described tube section and first.
10. 10. plug as claimed in claim 9, the pattern length of the wherein said tube and the second ring section equals the tube segment length of three contact audio plug of similar size substantially.
11. 11. plug as claimed in claim 10, wherein dispose the tube of described plug and the second ring section segment length so that a contact of the second ring Duan Yusan contact audio jack contact.
12. 12. plug as claimed in claim 11 arranges that wherein the tube and second of described plug encircles section so that in case described plug inserts three contact jack, the tube and second of the described plug of tube contact cross-over connection of described jack encircles section.
13. 13. plug as claimed in claim 8, total yardstick of wherein said plug equals total yardstick of standardized 2.5mm audio jack substantially, so that described plug and 2.5mm audio jack compatibility.
14. 14. plug as claimed in claim 8, total yardstick of wherein said plug equals total yardstick of standardized 3.5mm audio jack substantially, so that described plug and 3.5mm audio jack compatibility.
15. 15. plug as claimed in claim 8, wherein said plug component part audio peripheral device, and described plug is as interconnecting described audio peripheral device and the audio devices with three contact audio jack or four contact audio jack.
16. 16. plug as claimed in claim 15, wherein said audio peripheral device also comprises the microphone of the end section that is coupled to described plug, be coupled to first loud speaker of the first ring section of described plug, be coupled to second loud speaker of the second ring section of described plug, and the ground connection of being coupled to the tube section of described plug.
17. 17. an audio devices comprises:

    The audio frequency input circuit;

    First and second audio output circuits; And

    With four contact audio jack of three and four contact audio plug compatibilities,

    Described jack is connected to described audio frequency input and output circuit, and comprises:

    First contact is arranged to contact with the end section of four contact audio plug with three;

    Second contact is arranged to contact with the ring section of four contact audio plug with three;

    The 3rd contact is arranged to contact with the tube section of four contact audio plug with three; And

    The 4th contact is arranged to contact with the second ring section of four contact audio plug and the tube section of three contact audio plug.
18. 18. audio devices as claimed in claim 17, wherein described audio frequency input circuit is coupled in first contact, and the second and the 4th contact is coupled to first and second audio output circuits respectively, and the ground of described audio devices is coupled in the 3rd contact.
19. 19. audio devices as claimed in claim 18, wherein said audio devices also comprises short-circuit detecting and control circuit, as forbidding that second audio output circuit is with the short circuit between third and fourth contact of the described jack of response detection.
20. 20. audio devices as claimed in claim 17, wherein said audio devices also comprises short-circuit detecting and control circuit, forbids in first and second audio output circuits during as the corresponding contact ground connection of described audio output circuit in described jack.
21. 21. audio devices as claimed in claim 20, wherein said audio devices also comprise the audio frequency output control circuit of the audio signal of regulating described audio output circuit output, if forbid other audio output circuits then do not forbid described audio output circuit.
22. 22. audio devices as claimed in claim 21, if wherein forbade other audio output circuits described audio frequency output control circuit to regulate will be the described audio signal of combination stereo audio signal, and if do not forbid other audio output circuits then regulate being the described audio signal of a sound channel of stereo audio signal.

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