CN103618982A

CN103618982A - Circuit and method for lowering far-end echoes, headset detecting circuit and method and headset

Info

Publication number: CN103618982A
Application number: CN201310671528.7A
Authority: CN
Inventors: 林翔
Original assignee: Lenovo Beijing Ltd
Current assignee: Lenovo Beijing Ltd
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2014-03-05
Anticipated expiration: 2033-12-10
Also published as: CN103618982B

Abstract

The invention provides a circuit for lowering far-end echoes, which is applied to a first electronic device. The first electronic device comprises a left loudspeaker, a right loudspeaker and a microphone unit, and further comprises a first switch unit, wherein the first switch unit is in series connected with the microphone unit; when a first preset instruction is received, a connection route of the microphone unit and the externally-connected electronic device is disconnected; meanwhile, an equivalent resistor on the microphone unit is not accessed into the electronic device end, so that far-end echoes are not generated, and a problem that far-end echoes are generated by pressing a hook key for a long time to mute a microphone in the prior art is solved.

Description

The circuit of reduction far-end echo and method, earphone detection circuit and method, earphone

Technical field

The present invention relates to the communications field, in particular, relate to a kind of circuit that reduces far-end echo and method, earphone detection circuit and method, earphone.

Background technology

Along with the fast development of mobile communication technology, with the mobile electronic device of phonetic function, by increasing consumer, used, meanwhile, earphone also becomes one of requisite communication accessory in routine work life.

At present, while using earphone call on mobile electronic terminal, pressing hook key if short, hang up the telephone, if long, press hook key, is to make Mike quiet.But inventor finds long when pressing hook key and making Mike quiet, far-end can produce echo, affects user's result of use.

Summary of the invention

In view of this, the invention provides a kind of circuit that reduces far-end echo, long when pressing hook key and making Mike quiet to overcome in prior art, far-end can be heard the problem of echo.

For achieving the above object, the invention provides following technical scheme:

Reduce a circuit for far-end echo, be applied to the first electronic equipment, described the first electronic equipment comprises left speaker, right loud speaker and microphone unit, and described circuit comprises:

Be in series with described microphone unit, and when receiving the first preset instructions, the first switch element that the connecting path between described microphone unit and described electronic equipment is disconnected.

Preferably, described the first switch element is hook key or switch.

Preferably, when described the first switch element is hook key, described the first preset instructions is for pressing described hook key.

Preferably, when described the first switch element is switch, described the first preset instructions is for disconnecting the operation of described switch.

An earphone, comprises that any one reduces the circuit of far-end echo.

An earphone detection circuit, is applied to the second electronic equipment, comprising:

Be connected with the universal input/output interface in described the second electronic equipment, and be arranged on and loop that microphone unit forms between, when receiving the second preset instructions, can control the analog switch that between described microphone unit and described earphone detection circuit, path disconnects.

Preferably, described the second preset instructions is:

When the hook key that earphone detected is pressed, the control signal opening circuit for controlling described microphone unit and described earphone detection circuit that the universal input in described the second electronic equipment/output interface produces.

Reduce a method for far-end echo, be applied to reduce the circuit of far-end echo or the electronic equipment matching with the circuit of described reduction far-end echo, it is characterized in that:

When receiving the 3rd preset instructions, the connecting path of controlling between described microphone unit and described electronic equipment disconnects.

Preferably, described the 3rd preset instructions is for pressing described hook key.

An earphone detecting method, is applied to the electronic equipment that matches with the circuit that reduces far-end echo, it is characterized in that:

Detect the voltage of the first default port in described electronic equipment, when the voltage of the described first default port being detected and be the first predeterminated voltage, the circuit that judges the echo of described reduction far-end accesses described electronic equipment, when the voltage of the described first default port being detected and be the second predeterminated voltage, judge that the circuit of described reduction far-end echo disconnects described electronic equipment.

Known via above-mentioned technical scheme, compared with prior art, the invention provides a kind of circuit that reduces far-end echo, be applied to the first electronic equipment, this first electronic equipment comprises left speaker, right loud speaker and microphone unit, also comprises the first switch element.Wherein, the first switch element and microphone unit are in series, and when receiving the first preset instructions, the connecting path between microphone unit and electronic equipment are disconnected.

Discovery in conjunction with inventor: in prior art, long when pressing hook key and making Mike quiet, far-end can produce echo, because hook key while pressing, make microphone unit place branch, short-circuit, now, the equivalent resistance on earphone is larger, the gain of the base band end of the external connected electronic equipment that sound dividing potential drop is entered be connected with earphone is larger, and then far-end can produce echo.Circuit provided by the invention, when receiving the first preset instructions, disconnects the connecting path of microphone unit and external connected electronic equipment, now, equivalent resistance on microphone unit does not access electronic equipment end, so far-end can echogenicity, has effectively solved prior art problem.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.

Fig. 1 is the circuit diagram of the internal circuit of earphone in prior art;

A kind of schematic diagram that reduces the circuit of far-end echo that Fig. 2 provides for the embodiment of the present invention;

Fig. 3 is in prior art, when earphone hook key is pressed, and the oscillogram of the echo of generation;

During circuit that Fig. 4 is the reduction far-end echo that adopts the embodiment of the present invention and provide, the oscillogram of the echo of generation;

Fig. 5 is the circuit diagram of the ADC testing circuit of electronic equipment end in prior art;

A kind of circuit diagram that reduces the earphone detection circuit of far-end echo that Fig. 6 provides for the embodiment of the present invention;

Fig. 7 is a kind of theory diagram that reduces the method for far-end echo provided by the invention;

Fig. 8 is a kind of structural representation that reduces the device of far-end echo provided by the invention;

Fig. 9 is the theory diagram of a kind of Test earphone detection method provided by the invention;

Figure 10 is the block diagram of the part-structure of the relevant mobile phone of the terminal equipment that provides to the embodiment of the present invention.

Embodiment

For quote and know for the purpose of, the explanation of the technical term hereinafter using, write a Chinese character in simplified form or abridge and be summarized as follows:

GIPO:General Purpose Input Output, universal input/output

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.

The invention provides a kind of circuit that reduces far-end echo, be applied to the first electronic equipment, this first electronic equipment comprises left speaker, right loud speaker and microphone unit, also comprises the first switch element.Circuit provided by the invention, when receiving the first preset instructions, disconnects the connecting path of microphone unit and external connected electronic equipment, now, equivalent resistance on microphone unit does not access electronic equipment end, therefore can not produce noise, has effectively solved prior art problem.

Embodiment mono-

Refer to accompanying drawing 1, for the circuit diagram of earphone in prior art, known, this head circuit comprises: hook key, Mike MIC, left speaker L, right loud speaker R and headset plug.

Its circuit connecting relation is:

On headset plug, be provided with four ends: first end, the second end, the 3rd end and the 4th end.Wherein, left speaker is serially connected in the first end of above-mentioned headset plug, and right loud speaker is serially connected in the second end of above-mentioned headset plug, and the 3rd of described headset plug is earth terminal, Mike and hook key are in parallel, and the branch road after the two parallel connection is connected in series with the 4th end of above-mentioned earphone.

While using earphone call on electric terminal, if short, press hook key, hang up the telephone.If long, pressing hook key, is to realize Mike's mute function.But inventor finds: by length, press hook key and realize the quiet following problem that has:

Because hook key is in parallel with Mike, when hook key is pressed, be equivalent to Mike to be shorted to ground.And now, Mike enters very large of gain that mobile phone baseband end opens, (because Mike's sound turns electric signal and only has tens millivolts, and equivalent resistance on earphone, such as the connecting line resistance on line resistance, earphone and the earphone base of earphone self and mobile phone baseband end, can use the GND of earphone to do line resistance that FM antenna produces etc., these line groups are conventionally added up and can be greater than 1 ohm.And then cause far-end one's voice in speech unpurified to form Mike's input that dividing potential drop is input to base band by this, form very large echo, as shown in Figure 3.

For addressing the above problem, the present embodiment provides a kind of circuit that reduces far-end echo, as described in Figure 2, comprises left speaker L, right loud speaker R, microphone unit 210 and switch element 220.

Concrete, this switch element 220 is in series with above-mentioned microphone unit 210, when receiving the first preset instructions, the connecting path between microphone unit and electronic equipment is disconnected.Wherein, switch element 220 can be hook key, can be also switch.This switch can be simple physical button switch, also can be for possessing the switch module of switching function.It should be noted that, the switch module that possesses switching function can be the circuit structure being formed by triode or metal-oxide-semiconductor, than physical button switch, this switch module needs the input interfaces that increase a control signal more, for controlling the unlatching of switching tube and the states of shutoff such as triode and metal-oxide-semiconductor, this switch module is known to the skilled person technology, at this, its circuit structure and operation principle is not introduced.

When switch element is hook key, the first preset instructions can be when hook key being detected and press, disconnect microphone unit place branch road, now, equivalent resistance on earphone does not access electronic equipment end, therefore can echogenicity, echo oscillogram now as shown in Figure 4, has effectively solved prior art problem.Certainly, when the first switch element is a switch, when switch herein can be understood as a physical button, corresponding, the first preset instructions can be any one operation that disconnects this physical button, as long as can make loop, disconnection place, Mike unit.

It should be noted that, because the present embodiment has changed the relation of microphone unit and hook key, corresponding, in order to meet user's operating habit, the logical relation of the hook key adopting in the present embodiment is contrary with the logical relation of hook key in prior art, be specially: common headphones is when hook key is not pressed, hook key place branch road disconnects, microphone unit place in circuit now, when hook key is pressed, hook key place branch road is conducting, and now microphone unit is by short circuit, and the path between microphone unit and electronic equipment disconnects.And the improved circuit of the present embodiment is when hook key is not pressed, the branch road at hook key place is closed, now microphone unit access loop, and when hook key is pressed, the branch road at hook key place disconnects.User is when using this earphone call like this, if needs normal talking is without pressing this button, need to carry out mic when quiet, and quiet key directly pushes button.

The interference of the electronic equipment end Test earphone signal that inventor brings in the change of considering head circuit structure, corresponding, the earphone detecting method of electronic equipment end is also adjusted, as shown in Figure 9:

S201: the voltage that detects the first default port in described electronic equipment.

S202: when the voltage of the described first default port being detected and be the first predeterminated voltage, judge that the circuit of described reduction far-end echo accesses described electronic equipment.

S203: when the voltage of the described first default port being detected and be the second predeterminated voltage, judge that the circuit of described reduction far-end echo disconnects described electronic equipment.

Concrete, can be understood as: the voltage of EINT end in the ADC module of detected electrons equipment, when the voltage of EINT end being detected and be low-voltage, judges that earphone inserts electronic equipment, when the voltage of EINT end being detected and be high level, judge that earphone extracts electronic equipment.

Referring to Fig. 5, is the ADC detection module of electronic equipment end in prior art.Conventionally, when earphone inserts electronic equipment, the voltage that the ADC end of ADC module detects is that low level is (due to now, ADC end forms path with microphone unit, the voltage that ADC detects is ground terminal voltage), when earphone is extracted, the voltage that ADC module detects is micbias voltage, and this micbias voltage is high voltage.Visible, in prior art, if the voltage that ADC module detects is micbias voltage, judge that earphone extracts.But the earphone that has used the application to provide, when hook key is pressed, that ADC detects is high voltage (micbias), and in prior art, when hook key is pressed, what ADC module detected is low-voltage.In conjunction with above-mentioned principle, known, while adopting this earphone, can not be as the criterion with the judgement of ADC module, need to judge whether earphone is extracted with EINT.

To sum up, the invention provides a kind of circuit that reduces far-end echo, be applied to the first electronic equipment, this first electronic equipment comprises left speaker, right loud speaker and microphone unit, also comprises the first switch element.Wherein, the first switch element and microphone unit are in series, and when receiving the first preset instructions, the connecting path between microphone unit and electronic equipment are disconnected.Discovery in conjunction with inventor: in prior art, long when pressing hook key and making Mike quiet, far-end can produce echo, because hook key while pressing, make Mike place branch, short-circuit, now, the equivalent resistance on earphone is larger, the gain of the base band end of the external connected electronic equipment that sound dividing potential drop is entered be connected with earphone is larger, and then produces echo.Circuit provided by the invention, when receiving the first preset instructions, disconnects the connecting path of microphone unit and external connected electronic equipment, now, equivalent resistance on earphone does not access electronic equipment end, therefore can not produce noise, has effectively solved prior art problem.

Embodiment bis-

The change of the embodiment that the invention described above provides for doing at earphone terminal circuit, the present embodiment also provides a kind of earphone detection circuit that reduces far-end echo, is applied to electronic equipment, as shown in Figure 6, comprising:

Wherein, the second preset instructions can be for when the hook key that earphone detected be pressed, the control signal that universal input/output interface GPIO of mobile phone baseband produces, and this control signal is for controlling opening circuit of microphone unit and earphone detection circuit.

Its concrete operation principle is:

On microphone unit path on mobile phone, add an analog switch, the Enable Pin of analog switch is opened control by a GPIO of mobile phone baseband, and GPIO opens under normal circumstances, keeps microphone unit path to be communicated with.When cell phone system detects earphone hook key and presses, synchronous enabled GPIO, disconnects microphone unit path.

Embodiment tri-

In addition to the implementation, the present embodiment also provides a kind of method that reduces far-end echo, its flow chart as shown in Figure 7, the circuit of the reduction far-end echo of the method based on providing with embodiment mono-, be applied to electronic equipment end, the method is when receiving the 3rd preset instructions, and the connecting path of controlling between described microphone unit and described electronic equipment disconnects.Specifically comprise step:

S101: detect hook key and whether be pressed.

S102: if the connecting path of controlling between described microphone unit and described electronic equipment disconnects; If not, do not carry out any operation.

It should be noted that, the circuit of the detection method of this embodiment based on embodiment mono-, this circuit comprises: comprise left speaker, right loud speaker, microphone unit and switch element.

Concrete, this switch element and above-mentioned microphone unit are in series, and when receiving the first preset instructions, the connecting path between microphone unit and electronic equipment are disconnected.Wherein, when switch element is hook key, can be when hook key being detected and press, disconnect microphone unit place branch road, now, the equivalent resistance on earphone does not access electronic equipment end, therefore can not produce echo.

In the embodiment that the invention described above provides, describe method in detail, for method of the present invention, can adopt the device of various ways to realize, so the present invention also provides a kind of device, provided specific embodiment below and be elaborated.

Refer to Fig. 8, a kind of structural representation schematic diagram that reduces the device of far-end echo for the present embodiment head provides, comprising:

Whether detection module 101, be pressed for detection of hook key.

Control module 102, for when hook key is pressed, the connecting path of controlling between described microphone unit and described electronic equipment disconnects.

The circuit of far-end echo when its checkout gear and control device can be pressed for the reduction hook key providing in embodiment mono-, also the earphone detection circuit of far-end echo in the time of can pressing for the reduction hook key in embodiment bis-, can also be the software module of corresponding function, then this limit.

The hardware configuration of the terminal equipment below embodiment of the present invention being provided is described, and relates to the part of the message registration acquisition methods of terminal equipment in below describing, can be with reference to the message registration acquisition methods of above-described terminal equipment, and both can cross-reference.

The terminal equipment that the embodiment of the present invention provides can mobile phone, panel computer, PDA(Personal Digital Assistant, personal digital assistant) etc., take terminal equipment as mobile phone be example: shown in Figure 10 is the block diagram of the part-structure of the mobile phone that the terminal equipment that provides to the embodiment of the present invention is relevant.With reference to Figure 10, mobile phone comprises: radio frequency (Radio Frequency, RF) parts such as circuit 1110, memory 1120, input unit 1130, display unit 1140, transducer 1150, voicefrequency circuit 1160, Wireless Fidelity (wireless fidelity, WiFi) module 1170, processor 1180 and power supply 1190.It will be understood by those skilled in the art that the handset structure shown in Figure 10 does not form the restriction to mobile phone, can comprise the parts more more or less than diagram, or combine some parts, or different parts are arranged.

Below in conjunction with Figure 10, each component parts of mobile phone is carried out to concrete introduction:

RF circuit 1110 can be used for receiving and sending messages or communication process in, the reception of signal and transmission, especially, after the downlink information of base station is received, process to processor 1180; In addition, the up data of design are sent to base station.Conventionally, RF circuit includes but not limited to antenna, at least one amplifier, transceiver, coupler, low noise amplifier (Low Noise Amplifier, LNA), duplexer etc.In addition, RF circuit 110 can also be by radio communication and network and other devices communicatings.Above-mentioned radio communication can be used arbitrary communication standard or agreement, include but not limited to global system for mobile communications (Global System of Mobile communication, GSM), general packet radio service (General Packet Radio Service, GPRS), code division multiple access (Code Division Multiple Access, CDMA), Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division Multiple Access, WCDMA), Long Term Evolution (Long Term Evolution, LTE)), Email, Short Message Service (Short Messaging Service, SMS) etc.

Memory 1120 can be used for storing software program and module, and processor 1180 is stored in software program and the module of memory 1120 by operation, thereby carries out various function application and the data processing of mobile phone.Memory 1120 can mainly comprise storage program district and storage data field, wherein, and the application program (such as sound-playing function, image player function etc.) that storage program district can storage operation system, at least one function is required etc.; The data (such as voice data, phone directory etc.) that create according to the use of mobile phone etc. can be stored in storage data field.In addition, memory 1120 can comprise high-speed random access memory, can also comprise nonvolatile memory, for example at least one disk memory, flush memory device or other volatile solid-state parts.

Input unit 1130 can be used for receiving numeral or the character information of input, and generation arranges with the user of mobile phone 1100 and function is controlled relevant key signals input.Particularly, input unit 1130 can comprise contact panel 1131 and other input equipments 1132.Contact panel 1131, also referred to as touch-screen, can collect user or near touch operation (using any applicable object or near the operations of annex on contact panel 1131 or contact panel 1131 such as finger, stylus such as user) thereon, and drive corresponding jockey according to predefined formula.Optionally, contact panel 1131 can comprise touch detecting apparatus and two parts of touch controller.Wherein, touch detecting apparatus detects user's touch orientation, and detects the signal that touch operation is brought, and sends signal to touch controller; Touch controller receives touch information from touch detecting apparatus, and converts it to contact coordinate, then gives processor 1180, and the order that energy receiving processor 1180 is sent is also carried out.In addition, can adopt the polytypes such as resistance-type, condenser type, infrared ray and surface acoustic wave to realize contact panel 1131.Except contact panel 1131, input unit 1130 can also comprise other input equipments 1132.Particularly, other input equipments 1132 can include but not limited to one or more in physical keyboard, function key (controlling button, switch key etc. such as volume), trace ball, mouse, action bars etc.

Display unit 1140 can be used for showing the information inputted by user or the various menus of the information that offers user and mobile phone.Display unit 1140 can comprise display floater 1141, optionally, can adopt the forms such as liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode (Organic Light-Emitting Diode, OLED) to configure display floater 1141.Further, contact panel 1131 can cover display floater 1141, when contact panel 1131 detect thereon or near touch operation after, send processor 1180 to determine the type of touch event, corresponding vision output is provided according to the type of touch event with preprocessor 1180 on display floater 1141.Although in Fig. 8, contact panel 1131 and display floater 1141 be as two independently parts realize input and the input function of mobile phone, but in certain embodiments, can contact panel 1131 and display floater 1141 is integrated and realize the input and output function of mobile phone.

Mobile phone 1100 also can comprise at least one transducer 1150, such as optical sensor, motion sensor and other transducers.Particularly, optical sensor can comprise ambient light sensor and proximity transducer, and wherein, ambient light sensor can regulate according to the light and shade of ambient light the brightness of display floater 1141, proximity transducer can, when mobile phone moves in one's ear, cut out display floater 1141 and/or backlight.A kind of as motion sensor; accelerometer sensor can detect the size of the acceleration that (is generally three axles) in all directions; when static, can detect size and the direction of gravity, can be used for identifying application (such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, knock) of mobile phone attitude etc.; As for mobile phone other transducers such as configurable gyroscope, barometer, hygrometer, thermometer, infrared ray sensor also, do not repeat them here.

Voicefrequency circuit 1160, loud speaker 1161, microphone 1162 can provide the audio interface between user and mobile phone.Voicefrequency circuit 1160 can be transferred to loud speaker 1161 by the signal of telecommunication after the voice data conversion receiving, and is converted to voice signal exports by loud speaker 1161; On the other hand, microphone 1162 is converted to the signal of telecommunication by the voice signal of collection, after being received by voicefrequency circuit 1160, be converted to voice data, after again voice data output processor 1180 being processed, through RF circuit 1110, to send to such as another mobile phone, or export voice data to memory 1120 to further process.

WiFi belongs to short range wireless transmission technology, mobile phone by WiFi module 1170 can help that user sends and receive e-mail, browsing page and access streaming video etc., it provides wireless broadband internet access for user.Although Fig. 8 shows WiFi module 1170, be understandable that, it does not belong to must forming of mobile phone 1100, completely can be as required in not changing the essential scope of invention and omit.

Processor 1180 is control centres of mobile phone, utilize the various piece of various interface and the whole mobile phone of connection, by moving or carry out software program and/or the module being stored in memory 1120, and call the data that are stored in memory 1120, carry out various functions and the deal with data of mobile phone, thereby mobile phone is carried out to integral monitoring.Optionally, processor 1180 can comprise one or more processing units; Preferably, processor 1180 can integrated application processor and modem processor, and wherein, application processor is mainly processed operating system, user interface and application program etc., and modem processor is mainly processed radio communication.Be understandable that, above-mentioned modem processor also can not be integrated in processor 1180.

Mobile phone 1100 also comprises that the power supply 1190(powering to all parts is such as battery), preferably, power supply can be connected with processor 1180 logics by power-supply management system, thereby realizes the functions such as management charging, electric discharge and power managed by power-supply management system.

Although not shown, mobile phone 1100 can also comprise camera, bluetooth module etc., does not repeat them here.

In embodiments of the present invention, the included processor 1180 of this terminal equipment also has following functions:

Visible, the invention provides a kind of circuit that reduces far-end echo, be applied to the first electronic equipment, this first electronic equipment comprises left speaker, right loud speaker and microphone unit, also comprises the first switch element.Wherein, the first switch element and microphone unit are in series, and when receiving the first preset instructions, the connecting path between microphone unit and electronic equipment are disconnected.Discovery in conjunction with inventor: in prior art, long when pressing hook key and making Mike quiet, far-end can produce echo, because hook key while pressing, make Mike place branch, short-circuit, now, the equivalent resistance on earphone is larger, the gain of the base band end of the external connected electronic equipment that sound dividing potential drop is entered be connected with earphone is larger, and then produces echo.Circuit provided by the invention, when receiving the first preset instructions, disconnects the connecting path of microphone unit and external connected electronic equipment, now, equivalent resistance on earphone does not access electronic equipment end, therefore can echogenicity, effectively solved prior art problem.

In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part partly illustrates referring to method.

Professional can also further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.

The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.

Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims

1. reduce a circuit for far-end echo, be applied to the first electronic equipment, described the first electronic equipment comprises left speaker, right loud speaker and microphone unit, it is characterized in that, described circuit comprises:

2. the circuit of reduction far-end according to claim 1 echo, is characterized in that, described the first switch element is hook key or switch.

3. the circuit of reduction far-end according to claim 2 echo, is characterized in that, when described the first switch element is hook key, described the first preset instructions is for pressing described hook key.

4. the circuit of reduction far-end according to claim 2 echo, is characterized in that, when described the first switch element is switch, described the first preset instructions is for disconnecting the operation of described switch.

5. an earphone, is characterized in that, comprises that any one as described in claim 1-4 reduces the circuit of far-end echo.

6. an earphone detection circuit, is applied to the second electronic equipment, it is characterized in that, comprising:

7. earphone detection circuit according to claim 6, is characterized in that, described the second preset instructions is:

8. reduce a method for far-end echo, be applied to the circuit of the reduction far-end echo described in claim 1-4 or the electronic equipment matching with the circuit of described reduction far-end echo, it is characterized in that:

9. the method for reduction far-end according to claim 8 echo, is characterized in that, described the 3rd preset instructions is for pressing described hook key.

10. an earphone detecting method, is applied to the electronic equipment that matches with the circuit that reduces far-end echo, it is characterized in that: