the invention will be further described with the following embodiments and drawings . the first embodiment of the present invention : a method for supplying power for an anc earphone by utilization of a power source of electronic equipment . its operation flow chart is shown in fig1 . when the earphone plug is inserted into an earphone jack of the electronic equipment , the electronic equipment and the anc earphone enter into detection mode , i . e ., the electronic equipment detects whether the described earphone is in anc mode . a detection and control module of the electronic equipment tests the characteristics of the earphone plug to determine whether it is an anc earphone or a standard earphone . the following detection method can be used : detect the electrical characteristics ( e . g ., resistance , capacitance , inductance , or signal ) of the microphone contact ( or terminal or a pin ), left channel ( or left side ) audio contact , or right channel ( or right side ) audio contact of the earphone plug ; if the electrical characteristics detected based on this electrical test match predetermined electrical parameters for anc earphones , the earphone is in anc mode ; if the electrical characteristics detected based on this electrical test match the predetermined electrical parameters for standard ( or normal , regular , or ordinary ) earphones , the earphone is in a normal ( or standard , regular , or ordinary ) mode , i . e ., non - anc mode . when the anc earphone is in a normal mode ( non - anc mode ), it operates as a standard earphone to connect ( or couple ) and interact with the electronic equipment . the standard earphone does not require the electronic equipment to supply power . when the anc earphone is in anc mode , it uses the power source of the electronic equipment to supply power to its noise canceling circuit . the electronic equipment and the anc earphone enter into listening mode . in listening mode , a switch module of the electronic equipment disconnects ( or decouples ) a microphone terminal of an audio module from a microphone contact of the earphone jack , and connects a power source of the electronic equipment to the microphone contact of the earphone jack ; a switch module of the anc earphone disconnects a microphone contact of the earphone plug from a hands - free microphone circuit of the earphone , connects the microphone contact to a power supply terminal of the noise canceling circuit , a left channel audio contact to a left channel audio terminal of the noise canceling circuit , and a right channel audio contact to a right channel audio terminal of the noise canceling circuit . in this mode , the hands - free microphone does not function ; the microphone channel is occupied and used as the power output channel of the electronic equipment . when the electronic equipment receives or issues a dialogue request , it enters into a dialogue mode and sends a reminder signal to the anc earphone ; the anc earphone returns a signal to the electronic equipment and switches to dialogue mode . in dialogue mode , the switch module of the electronic equipment disconnects the power source from the microphone contact of the earphone jack , disconnects a left channel audio terminal of the audio module from the left channel audio contact of the earphone jack , connects the power source to the left channel audio contact of the earphone jack , connects the right channel audio terminal of the audio module to the right channel audio contact of the earphone jack , and connects the microphone terminal of the audio module to the microphone contact of the earphone jack ; the switch module of the anc earphone connects the left channel audio contact of the earphone plug to the power supply terminal of the noise canceling circuit , connects the right channel audio contact of the earphone plug to the right and left channel audio terminals of the noise canceling circuit , and connects the microphone contact of the earphone plug to the hands - free microphone circuit of the earphone . in dialogue mode , the hands - free microphone circuit is properly connected and functioning . the left audio channel is occupied to operate as a power output channel of the electronic equipment . the audio signal of the left audio channel of the electronic equipment is not sent to the earphone . the audio signal of the right audio channel of the electronic equipment is transmitted to the right channel audio terminal and the left channel audio terminal of the noise canceling circuit of the earphone through the right audio channel . the user hears the signal of the right audio channel from both the left and right speakers . when the dialogue ends , the electronic equipment enters listening mode , and sends a reminder signal to the anc earphone . the anc earphone returns a signal to the electronic equipment , and switches to listening mode . when the anc earphone switches between the listening and dialogue modes , i . e ., the power supply terminal of the noise canceling circuit switches between the microphone contact and the left channel audio contact , the anc earphone has no external power supply for a moment . an electrical energy storage module of the anc earphone obtains power from the electronic equipment to charge up and store during anc usage ( i . e ., listening and dialogue modes ), and continues to supply power to the noise canceling circuit , the detection and control module , and the switch module when there is no external power supply . a device used to achieve the method of the invention discussed above includes the anc earphone 1 and electronic equipment 2 . the components of the anc earphone with identical names as the components of the electronic equipment are referred to by an “ a ” identifier and the components of the electronic equipment with identical names as the components of the anc earphone are referred to by a “ b ” identifier . the electronic equipment 2 has speech capabilities and is a cell phone , a personal computer , a laptop , or a tablet . the anc earphone 1 includes an earphone plug 3 , an audio playback unit 4 , a noise canceling circuit 5 , a hands - free microphone circuit 6 , a detection and control module a 24 , a switch module a 25 , and an electrical energy storage module 28 . the electrical energy storage module 28 , power supply terminal 11 of the noise canceling circuit , and detection and control module a 24 are connected to the switch module a 25 . the audio playback unit 4 , noise canceling circuit 5 , and hands - free microphone circuit 6 are connected to the switch module a 25 . the earphone plug 3 includes a ground contact a 7 , a microphone contact a 8 , a left channel audio contact a 9 , and a right channel audio contact a 10 . the noise canceling circuit 5 includes a power supply terminal 11 , a left channel audio terminal a 12 , and a right channel audio terminal a 13 . the detection and control module a 24 is connected to the microphone contact a 8 , left channel audio contact a 9 , or right channel audio contact a 10 . the electronic equipment 2 includes an audio module 14 , a power source 15 , an earphone jack 16 , a detection and control module b 26 , and a switch module b 27 . the power source 15 is connected to the switch module b 27 . the earphone jack 16 includes a ground contact b 17 , a microphone contact b 18 , a left channel audio contact b 19 , and a right channel audio contact b 20 . the audio module 14 includes a microphone terminal 21 , a left channel audio terminal b 22 , and a right channel audio terminal b 23 . the detection and control module b 26 is connected to the microphone contact b 18 , left channel audio contact b 19 , or right channel audio contact b 20 . as shown in fig1 , the anc earphone 1 also includes a control unit 31 connected between the earphone plug 3 and the audio playback unit 4 . the control unit 31 is used for controlling on or off state , volume , and quality of the audio playback unit 4 . the noise canceling circuit 5 , the detection and control module a 24 , the switch module a 25 , and the electrical energy storage module 28 can be integrated on a single chip . the single chip is installed in the control unit 31 . the detection and control module b 26 and the switch module b 27 can also be integrated on a single chip . the single chip is installed in the electronic equipment 2 . the electronic equipment 2 also includes a control device 32 . the control device 32 is used for turning on or off the power source 15 and controlling the detection and control module b 26 and the switch module b 27 . the control device 32 is a hardware , software , or firmware module . the control device 32 is also used to set and adjust the operating parameters of the anc earphone 1 . how the system works : when the earphone plug 3 is inserted into the earphone jack 16 of the electronic equipment 2 , both the electronic equipment and the anc earphone enter a detection mode . a connection diagram of detection mode is shown in fig2 . when the electrical equipment is in the detection mode , the microphone contact b 18 connects through the switch module b 27 to the microphone terminal 21 , the left channel audio contact b 19 is connected through the switch module b 27 to the left channel audio terminal b 22 , and the right channel audio contact b 20 is connected through the switch module b 27 to the right channel audio terminal b 23 . when the anc earphone is in the detection mode , the power supply terminal 11 is connected through the switch module a 25 to the microphone contact a 8 , the left channel audio terminal a 12 is connected through the switch module a 25 to the left channel audio contact a 9 , and the right channel audio terminal a 13 is connected through the switch module a 25 to the right channel audio contact a 10 . while the system is in the detection mode , the detection and control module b 26 detects the electrical characteristics ( e . g ., resistance , capacitance , inductance , or signal ) of the microphone contact a 8 through the microphone contact b 18 , detects the electrical characteristics of the left channel audio contact a 9 through the left channel audio contact b 19 , and detects the electrical characteristics of the right channel audio contact a 10 through the right channel audio contact b 20 . these electrical characteristics are used to judge whether the anc earphone 1 is operating in the anc mode . if the earphone is operating in the normal mode ( non - anc mode ), the connection diagram is shown in fig6 . if the earphone is operating in the anc mode , the default mode of electronic equipment 2 is listening mode . the connection diagram of listening mode is shown in fig3 . the detection and control module b 26 sends a reminder signal to the detection and control module a 24 . the detection and control module a 24 returns a signal to the detection and control module b 26 . the anc earphone 1 also enters listening mode . the switch module b 27 ( not shown in the figure ) disconnects the microphone terminal 21 from the microphone contact b 18 , and connects the power source 15 to the microphone contact b 18 ; thus achieving the objective of supplying power to the noise canceling circuit 5 and storing energy into the electrical energy storage module 28 . the connection diagram of dialogue mode is shown in fig4 . when the electronic equipment 2 receives or issues a dialogue request , the electronic equipment 2 enters dialogue mode . the switch module b 27 ( not shown in the figure ) disconnects the power source 15 from the microphone contact b 18 , disconnects the left channel audio terminal b 22 of the audio module 14 of the electronic equipment 2 from the left channel audio contact b 19 of the earphone jack 16 , connects the power source 15 to the left channel audio contact b 19 , connects the right channel audio terminal b 23 of the audio module 14 to the right channel audio contact b 20 of the earphone jack 16 , and connects the microphone terminal 21 of the audio module 14 to the microphone contact b 18 of the earphone jack 16 . the detection and control module b 26 sends a reminder signal to the detection and control module a 24 . the detection and control module a 24 returns a signal to the detection and control module b 26 . the anc earphone 1 also enters dialogue mode . the switch module a 25 ( not shown in figure ) connects the left channel audio contact a 9 of the earphone plug 3 to the power supply terminal 11 of the noise canceling circuit 5 , connects the right channel audio contact a 10 of the earphone plug 3 to the left channel audio terminal a 12 and right channel audio terminal a 13 of the noise canceling circuit 5 , and connects the microphone contact a 8 of the earphone plug 3 to the hands - free microphone circuit 6 . further , during mode switching , the electrical energy storage module 28 supplies the stored energy to the noise canceling circuit 5 , detection and control module a 24 , and switch module a 25 . at the end of dialogue , the anc earphone 1 and the electronic equipment 2 both switch to listening mode . in a second embodiment of the present invention : the following are differences compared to the first embodiment . in dialogue mode , the right channel audio contact b 20 of the earphone jack 16 of electronic equipment 2 is used to supply power to the anc earphone 1 . as shown in fig5 and 7 , when the electronic equipment 2 receives or issues a dialogue request , the electronic equipment 2 enters dialogue mode . the switch module b 27 ( not shown in the figure ) disconnects the power source 15 from the microphone contact b 18 , disconnects the right channel audio terminal b 23 of the audio module 14 from the right channel audio contact b 20 of the earphone jack 16 , connects the power source 15 to the right channel audio contact b 20 , connects the left channel audio terminal b 22 of the audio module 14 to the left channel audio contact b 19 of the earphone jack 16 , and connects the microphone terminal 21 of the audio module 14 to the microphone contact b 18 of the earphone jack 16 . the detection and control module b 26 sends a reminder signal to the detection and control module a 24 . the detection and control module a 24 returns a signal to the detection and control module b 26 . the anc earphone 1 also enters dialogue mode . the switch module a 25 ( not shown in the figure ) connects the right channel audio contact a 10 of the earphone plug 3 to the power supply terminal 11 of the noise canceling circuit 5 , connects the left channel audio contact a 9 of the earphone plug 3 to the left channel audio terminal a 12 and the right channel audio terminal a 13 of the noise canceling circuit 5 , and connects the microphone contact a 8 of the earphone plug 3 to the hands - free microphone circuit 6 . in a third embodiment of the present invention : the following are differences compared to the first embodiment . in listening mode , the electronic equipment 2 supplies power to the noise canceling circuit 5 , detection and control module a 24 , switch module a 25 , and electrical energy storage module 28 of the anc earphone 1 ; the power supply method and device in listening mode are the same as in the first embodiment . but , in dialogue mode the electronic equipment 2 does not supply power to the anc earphone 1 , and the anc earphone 1 operates as a standard earphone and does not have anc function . the electronic equipment and anc earphone &# 39 ; s operation flow chart is shown in fig8 . when the electronic equipment 2 receives or issues a dialogue request , the electronic equipment 2 enters dialogue mode and sends a reminder signal to the anc earphone 1 . the anc earphone 1 returns a signal to the electronic equipment 2 and switches to dialogue mode . as shown in fig9 , in dialogue mode , the switch module b 27 of the electronic equipment 2 disconnects the power source 15 of the electronic equipment 2 from the microphone contact b 18 of the earphone jack 16 , connects the microphone terminal 21 of the audio module 14 of the electronic equipment 2 to the microphone contact b 18 of the earphone jack 16 , connects the left channel audio terminal b 22 to the left channel audio contact b 19 , and connects the right channel audio terminal b 23 to the right channel audio contact b 20 ; the switch module a 25 of the anc earphone 1 disconnects the power supply terminal 11 of the noise canceling circuit 5 from the microphone contact a 8 of the earphone plug 3 , connects the left channel audio contact a 9 of the earphone plug 3 to the left channel audio terminal of the audio playback unit 4 , connects the right channel audio contact a 10 to the right channel audio terminal of the audio playback unit 4 , and connects the microphone contact a 8 of the earphone plug 3 to the hands - free microphone circuit 6 . when the anc earphone 1 is in dialogue mode , the electronic equipment 2 does not supply power to the anc earphone 1 . the anc earphone 1 , without external power source , relies on the electrical energy storage module 28 to continue supplying power to the detection and control module a 24 and switch module a 25 . the electrical energy storage module 28 of the anc earphone 1 gets power from the electronic equipment 2 for charging in listening mode . when the dialogue ends , the electronic equipment 2 enters listening mode , and sends a reminder signal to the anc earphone 1 . the anc earphone 1 returns a signal to the electronic equipment 2 , and switches to listening mode . in a fourth embodiment of the present invention : the following are differences compared to the first embodiment . as shown in fig1 , the earphone plug 3 includes a plug body 29 and a plug base 30 which is connected to the plug body 29 . at least one of the noise canceling circuit 5 , detection and control module a 24 , switch module a 25 , or electrical energy storage module 28 is installed in the plug base 30 . in a fifth embodiment of the present invention : the following are differences compared to the second embodiment . at least one of the noise canceling circuit 5 , detection and control module a 24 , switch module a 25 , or electrical energy storage module 28 is installed in the audio playback unit 4 . in a sixth embodiment of the present invention : the following are differences compared to the second embodiment . at least one of the noise canceling circuit 5 , detection and control module a 24 , switch module a 25 , or electrical energy storage module 28 is connected between the earphone plug 3 and the control unit 31 , or between the control unit 31 and the audio playback unit 4 . in a seventh embodiment of the present invention : the following are differences compared to the first embodiment . at least one of the noise canceling circuit 5 , detection and control module a 24 , switch module a 25 , or electrical energy storage module 28 is installed in the control unit 31 . in an eighth embodiment of the present invention : the following are differences compared to the first embodiment . the invention uses manual select method to replace automatic detection method . the detection and control module a 24 of the anc earphone 1 and the detection and control module b 26 of the electronic equipment 2 both use manual switches . the anc earphone 1 does not need an electrical energy storage module 28 . the detection and control module a 24 and the switch module a 25 are manual hardware switches which are used to turn on or off the listening and dialogue modes of the anc earphone 1 . the detection and control module b 26 and the switch module b 27 are manual hardware switches or man machine interface which is used to turn on or off the listening , dialogue , and anc modes of the electronic equipment 2 . in a ninth embodiment of the present invention : as shown in fig1 , the detection method in detection mode and the power supply method in listening mode are the same as in the first embodiment . in dialogue mode , the switch module b 27 of the electronic equipment 2 connects the power source 15 of the electronic equipment 2 to the microphone contact b 18 of the earphone jack 16 , and connects the microphone terminal 21 of the audio module 14 of the electronic equipment 2 to the left channel audio contact b 19 of the earphone jack 16 ; the switch module a 25 of the anc earphone 1 connects the microphone contact a 8 of the earphone plug 3 to the power supply terminal 11 of the noise canceling circuit 5 , connects the left channel audio contact a 9 of the earphone plug 3 to the hands - free microphone circuit 6 of the anc earphone 1 , and connects the right channel audio contact a 10 of the earphone plug 3 to the left channel audio terminal a 12 and right channel audio terminal a 13 of the noise canceling circuit 5 ; either the left channel audio terminal b 22 or right channel audio terminal b 23 of the audio module 14 is selected and connected to the right channel audio contact b 20 of the earphone jack 16 , the selected channel audio terminal is used to transmit the left or right audio signal sent from the audio module 14 . in dialogue mode , the invention continues to use the route in listening mode to supply power through the microphone contacts . the invention continues to occupy the microphone channel as the power output channel of the electronic equipment 2 . the invention selects the left audio channel to transmit hands - free microphone signals to make the hands - free microphone circuit 6 connect and operate normally . if the left channel audio terminal b 22 of the audio module 14 is connected to the right channel audio contact b 20 of the earphone jack 16 , the left audio signal is transmitted through the right audio channel to the left channel audio terminal a 12 and right channel audio terminal a 13 of the noise canceling circuit 5 . the sound outputs from both the left and right speakers are the left audio signal . if the right channel audio terminal b 23 of the audio module 14 is connected to the right channel audio contact b 20 of the earphone jack 16 , the right audio signal is transmitted through the right audio channel to the left channel audio terminal a 12 and right channel audio terminal a 13 of the noise canceling circuit 5 . the sound outputs from both the left and right speakers are the right audio signal . when the dialogue ends , the electronic equipment 2 enters listening mode and sends a reminder signal to the anc earphone 1 . the anc earphone 1 returns a signal to the electronic equipment 2 and switches to listening mode . since the power supply routes of listening mode and dialogue mode are the same , the anc earphone 1 does not have its power cutoff during mode switching . hence , the anc earphone 1 does not need to store energy in real time . in detection mode and listening mode , the device and method to achieve this embodiment is similar to the first embodiment , but does not need the electrical energy storage module 28 . the connection diagram of dialogue mode is shown in fig1 . the power supply module 15 is connected through the switch module b 27 ( not shown in the figure ) to the microphone contact b 18 . the microphone terminal 21 is connected through the switch module b 27 to the left channel audio contact b 19 . the right channel audio terminal b 23 is connected through the switch module b 27 to the right channel audio contact b 20 ( the switch module b 27 can also connect the left channel audio terminal b 22 to the right channel audio contact b 20 ). the microphone contact a 8 is connected through the switch module a 25 ( not shown in the figure ) to the power supply terminal 11 . the left channel audio contact a 9 is connected through the switch module a 25 to the hands - free microphone circuit 6 . the right channel audio contact a 10 is connected through the switch module a 25 to the left channel audio terminal a 12 and the right channel audio terminal a 13 . where the noise canceling circuit 5 , detection and control module a 24 , and switch module a 25 are installed may follow any one of the embodiments 4 to 7 . in a tenth embodiment of the present invention , as compared with the ninth embodiment , a difference is : in dialogue mode , the right audio channel is used instead of the left audio channel to transmit the microphone signal . the connection diagram is shown in fig1 . in the above ten embodiments , the anc earphone 1 further includes a manual switch or an electric switch to turn on or off the anc mode of the anc earphone 1 . the manual switch or the electric switch is installed in the control unit 31 . the detection and control modules and the switch modules of the electronic equipment 2 and the anc earphone 1 can be realized by electronic circuit technology . in the above ten embodiments , the following ways can be used by the electronic equipment 2 to detect whether the anc earphone 1 is in anc mode . the detection and control module b 26 sends an inquiry signal to the detection and control module a 24 . the detection and control module a 24 returns the mode ( anc mode or non - anc mode ) of the anc earphone 1 as a signal to the detection and control module b 26 . this detecting of the earphone is done by signal handshaking exchange . in detection mode , the microphone terminal 21 of the audio module 14 provides a bias voltage to the microphone contact a 8 of the earphone plug 3 through the microphone contact b 18 of the earphone jack 16 . the detection and control module a 24 , which is connected to the microphone contact a 8 , also gets the power source to complete the signal handshaking exchange with the detection and control module b 26 . additionally , when the electronic equipment 2 is a typical audio device , such as a music player , video player , multimedia player , and portable game console , its earphone jack does not have a microphone contact . it cannot supply power to anc earphone 1 . the connection diagram of anc earphone 1 and electronic equipment 2 is shown in fig1 . however , the 4 - pole ( or 4 - terminal ) earphone plug of anc earphone 1 described in the present invention is compatible with a 3 - pole ( or 3 - terminal ) earphone jack of a typical audio device , and can perform the listening function of a standard earphone .