WO2020029990A1 - 耳机线复用方法及装置、移动终端 - Google Patents

耳机线复用方法及装置、移动终端 Download PDF

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Publication number
WO2020029990A1
WO2020029990A1 PCT/CN2019/099559 CN2019099559W WO2020029990A1 WO 2020029990 A1 WO2020029990 A1 WO 2020029990A1 CN 2019099559 W CN2019099559 W CN 2019099559W WO 2020029990 A1 WO2020029990 A1 WO 2020029990A1
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Prior art keywords
terminal
headphone
interface
type
frequency selection
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PCT/CN2019/099559
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English (en)
French (fr)
Inventor
孙银川
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中兴通讯股份有限公司
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Publication of WO2020029990A1 publication Critical patent/WO2020029990A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/401—Circuits for selecting or indicating operating mode
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements

Definitions

  • Embodiments of the present invention relate to, but are not limited to, the technical field of terminals, and in particular, to a method and device for multiplexing earphone lines, and a mobile terminal.
  • the design method is to use the ground wire of the headset or
  • the left and right channels are used as low-frequency (such as FM) receiving and transmitting antennas.
  • it is recommended to use the ground wire as the antenna, but if the headset is provided with a shielding layer, the receiving performance of the left and right channels as antennas will be received by the shielding layer. influences.
  • terminals that use the Type-C interface to implement the headset function mainly adopt the following two methods:
  • the first method is to use a Type-C / 3.5mm adapter, which is completely consistent with the traditional USB + 3.5mm headset implementation method above;
  • Method two is a headset that is directly designed with a Type-C interface.
  • the interface definition is based on the standard protocol. This type of headset is currently relatively rare in the market. It mainly appears as a Type-C / 3.5mm adapter.
  • Type-C headsets are The borrowed USB interface is protected by a track-shaped metal sheet 1 at the earphone interface, as shown in Figure 1.
  • the metal ring 2 at the Type-C interface on the earphone and the metal shielding layer around the earphone cable (not shown in the figure) Connected, when the USB on the headset access terminal is used, the metal ring on the outside of the headset is in contact with the protective metal sheet of the USB.
  • the protective metal sheet of USB is generally All are directly grounded. Due to the presence of the metal shielding layer on the headphone cable, and after connecting to the USB socket of the terminal, the metal shielding layer is directly connected to the ground terminal of the terminal. If the channel is used as an antenna, the effect will be very poor, and the ideal effect will not be achieved at all, and the high impedance of the frequency selection network to the ground will greatly affect the audio effect of the headphones.
  • a method and a device for multiplexing earphone lines and a mobile terminal provided by embodiments of the present invention mainly solve the technical problem that the earphone line for an existing Type-C interface is directly connected to the ground terminal of the terminal due to the metal shield It is difficult to realize the technical problems of compatible use of FM and audio.
  • an embodiment of the present invention provides a method for multiplexing a headphone line.
  • the headphone line includes a Type-C headphone interface.
  • the method includes:
  • the working status includes a frequency modulation function status and a non-frequency modulation function status
  • the frequency selection control circuit controls the frequency selection control circuit to work in a frequency modulation working mode according to the frequency modulation function state;
  • the frequency selection control circuit If the current operating state of the terminal is a non-FM function state, controlling the frequency selection control circuit to work in a non-FM mode according to the headset function state.
  • an embodiment of the present invention further provides a headphone line multiplexing device, which includes a frequency selection control circuit, an acquisition module, and a control module, where:
  • the frequency selection control circuit is disposed between the Type-C interface of the terminal and the ground of the terminal;
  • the acquisition module is configured to detect a current working state of the terminal, where the working state includes a frequency modulation function state and a non-frequency modulation function state;
  • the control module is configured to control the frequency selection control circuit to work in a frequency modulation working mode according to the frequency modulation function state when the current working state obtained by the acquisition module is a frequency modulation function state; and obtain in the acquisition module When the current working state is a non-FM function state, the frequency selection control circuit is controlled to work in a non-FM mode according to the non-FM function state.
  • an embodiment of the present invention further provides a mobile terminal, which includes a headphone cable provided with a Type-C headphone interface, a Type-C interface, and the above-mentioned headphone cable multiplexing device.
  • the frequency selection control circuit in the device is set between the ground end of the Type-C interface and the ground end of the mobile terminal;
  • the headphone line multiplexing device controls the frequency selection control circuit to output a low-level control switching switch when the Type-C interface is plugged into the headphone line and the terminal works in a frequency modulation function state.
  • the earphone line is disconnected from the ground of the mobile terminal;
  • the frequency selection control circuit outputs a high-level control switch to short-circuit the earphone line and the ground of the mobile terminal.
  • an embodiment of the present invention further provides a mobile terminal, including a processor, a memory, a communication bus frequency selection control circuit, and a Type-C interface connected to the frequency selection control circuit;
  • the communication bus is used to implement a communication connection between the processor and the memory
  • the processor is configured to execute one or more programs stored in the memory to implement the steps of the headphone line multiplexing method described above.
  • a frequency selection control circuit is set between the Type-C interface on the terminal and the ground of the terminal, and the selection is controlled according to the current working status of the terminal.
  • the frequency control circuit works, thereby avoiding that when the headphone line is connected to the Type-C interface on the terminal, it will be directly connected to the ground of the terminal, which affects the performance index when the headphone line is used as an antenna.
  • the frequency selection control circuit is controlled to work in the FM working mode, so that the earphone line is not directly connected to the ground of the terminal, which prevents the metal shielding layer of the earphone line from being directly grounded, and the antenna signal is blocked.
  • the phenomenon of shielding solves the problem that the shielding layer affects the antenna index.
  • the headset is not required to implement the FM function, it also ensures the high-quality sound of the headset. This design not only achieves the compatibility of the FM function and the headset function, but also The receiving performance of the earphone line as an antenna is improved, and the user experience is improved.
  • FIG. 1 is a connection diagram of an existing Type-C interface
  • Figure 2 is a schematic diagram of the pin signal definition of the Type-C interface
  • FIG. 3 is a schematic flowchart of a headphone line multiplexing method according to Embodiment 1 of the present invention.
  • FIG. 4 is another schematic flowchart of a method for multiplexing earphone lines according to the first embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a frequency selection control circuit according to a second embodiment of the present invention.
  • FIG. 6 is a schematic circuit diagram of a part of a Type-C interface on a terminal according to a second embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an internal structure of a changeover switch according to an embodiment of the present invention.
  • FIG. 8 is another schematic diagram of a circuit of a Type-C interface on a terminal according to Embodiment 2 of the present invention.
  • FIG. 9 is a schematic structural diagram of a headphone multiplexing device according to a third embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a mobile terminal according to a fourth embodiment of the present invention.
  • FIG. 11 is another schematic structural diagram of a mobile terminal according to Embodiment 4 of the present invention.
  • USB and headphones share this interface, audio signals and USB signals have multiplexed parts, DP, DN and headphones The left and right channels are multiplexed.
  • S1-S4 is the external metal shell of the USB interface. If the Type-C headset is docked to this interface on the terminal motherboard, the shielding layer on the headphone cable will be connected to the metal shell. At present, In the design of the terminal's electronic circuit, by default, the metal shell on the interface is directly connected to the ground of the terminal. In the current design of the earphone cable, in order to improve the audio quality of the earphone, a shield layer is provided on the periphery of the earphone cable.
  • an embodiment of the present invention provides a multiplexing control method in which the metal shell of the Type-C interface cannot be directly grounded to solve the above problem.
  • the earphone line multiplexing method provided in this embodiment is shown in FIG. 3.
  • the earphone line multiplexing method provided in this embodiment is mainly used to implement the Type-C interface on the terminal as the earphone interface and the earphone line as an antenna. Realize FM function. Specifically, the method includes:
  • a frequency selection control circuit is set on the Type-C interface of the terminal, and the frequency selection control circuit is connected to the ground of the terminal.
  • the frequency selection control circuit is set between the ground of the terminal and the metal shell (that is, the ground pin) of the Type-C interface, and is used to float the ground pin on the Type-C interface. To prevent the earphone cable from being directly connected to the terminal's ground terminal when it is connected to the Type-C interface of the terminal.
  • the working state includes an FM function state and a non-FM function state
  • the working state is a state where the Type-C interface on the terminal is plugged into a headphone line, where the non-
  • the state of the FM function can specifically be the state of the audio, charging, USB, etc., that is, the state of the non-FM function can be all functional states except for the state of the FM function, which can use the Type-C interface.
  • this working state can be obtained by the terminal opening the upper-layer application.
  • the specific terminal first opens the upper-layer application (such as FM, music, etc.), and the terminal controls the frequency selection control circuit to perform corresponding operations according to the application, that is, to break. Open or closed.
  • this step it should also include detecting whether the Type-C interface on the terminal has a USB or headphone cable plugged in.
  • the signals are also different.
  • the terminal can detect whether the headphone cable or USB is connected according to these parameters. When it detects that the headphone cable is connected, step S303 is performed.
  • the working mode includes an FM mode and a non-FM working mode, which are working modes corresponding to functions such as the FM function and the headphone function.
  • the non-FM working mode may specifically be a high-quality sound mode, a charging mode, a USB mode, etc.
  • Mode that is, non-FM working mode can be all functional modes except Type-C working mode that can use Type-C interface.
  • the terminal when it is obtained that the current working state of the terminal is the frequency modulation function state, the terminal needs to adjust the frequency selection control circuit to the frequency modulation mode, that is, the frequency selection control circuit is connected in series to the Type-C interface.
  • the frequency selection control circuit is connected in series to the Type-C interface.
  • controlling the frequency selection control circuit to work in a high-quality sound effect mode is to short-circuit the frequency selection control circuit.
  • the terminal After detecting whether the Type-C interface on the terminal has a USB or earphone cable inserted, if the earphone cable (91) is inserted, the terminal generates the frequency selection control according to the current working state. Control signals of the circuit.
  • the Type-C interface (92) is plugged into a device that is not a headphone line.
  • the terminal is connected to the Type-C interface on the terminal to detect the potential of the configured channel pins to insert the headset cable into the terminal, and the frequency selection control is implemented according to the inserted headset cable and the current working status of the terminal.
  • the working mode of the circuit performs control operations, and its processing steps are shown in Figure 4:
  • step S403 After first performing step S401 and detecting that a headphone cable is inserted into the Type-C interface of the terminal in step S402, step S403 is performed.
  • the detection of the insertion of the earphone cable in step S402 can be implemented by detecting a change in the potential on the interface. When the potential of the pins on the interface changes and both are low, it indicates that the earphone cable is connected, and vice versa It means that the Type-C interface (92) is inserted into a device that is not a headphone cable.
  • step S405 is performed. Otherwise, step S404 is performed. For example, if a music application is started, step S404 is performed.
  • step S402 is specifically performed by detecting the potential of the configuration channel on the Type-C interface, which specifically refers to the ports corresponding to the CC1 and CC2 pins of the Type-C interface.
  • the definition of the pin signal of the -C interface is shown in Figure 2.
  • the terminal can detect the insertion of the headphone cable by detecting the potential on these two ports.
  • S404 Control the frequency selection control circuit to work in a high-quality sound effect mode according to the function status of the headset.
  • S405 Control the frequency selection control circuit to work in the frequency modulation working mode according to the frequency modulation function status.
  • the set function is the FM function, because the headphone line is connected to the terminal ground after passing through the frequency selection control circuit, so the headphone line is in the frequency modulation function state.
  • the frequency selection control circuit added in this embodiment specifically includes a frequency selection sub-circuit and a switch, and the two are connected in parallel.
  • the frequency selection sub-circuit is used for FM Frequency selection processing during function.
  • the switch is used to control the short-circuit connection of the frequency selection sub-circuit. When the selection switch is on, the frequency selection sub-circuit does not work. When it is off, the frequency selection sub-circuit is connected in series with the Type-C interface of the terminal. Between the metal shell of the terminal and the ground of the terminal, so as to realize compatible use of the FM function and the headphone function of the headphone cable.
  • the earphone line multiplexing method provided in this embodiment is provided with a frequency selection circuit between the shield layer of the earphone line and the ground end of the earphone line and the ground end of the terminal, so as to ensure that the antenna energy is not leaked to the ground of the terminal.
  • antenna performance is guaranteed; at the same time, when the earphone cable is not needed to implement the antenna function, the shielding effect of the metal shielding layer of the Type-C earphone cable and the high-quality sound effect of the earphone are also guaranteed.
  • this embodiment provides two frequency selection control circuits provided at a Type-C interface of a terminal. They are respectively connected between the shielding layer of the earphone line and the ground of the terminal and between the earphone line and the ground of the terminal.
  • the frequency selection control circuit includes a frequency selection sub-circuit and a switching switch.
  • the frequency selection sub-circuit is composed of a capacitor device and an inductor connected in parallel to each other, or is formed by using high-impedance magnetic beads at a specific frequency.
  • the switch is connected in parallel to the frequency selection sub-circuit.
  • One end of the frequency selection control circuit is connected to the earphone line, and the other end is connected to the ground terminal of the terminal, that is, the ground terminal on the motherboard of the terminal.
  • FIG. 6 is the circuit schematic diagram of the Type-C interface of the terminal.
  • USB3400 is the USB connector of the motherboard on the terminal (that is, the Type-C interface), which is used to connect a USB cable or a Type-C headphone cable
  • S3400 is a switch control switch, which is mainly used to control the switching of MIC and GND on the headphone line when the Type-C headphone cable is plugged in and out
  • capacitors C3401 and C3403, inductor L3403, capacitors C3402 and C3404, and inductor L3404 constitute The shielding layer on the headphone line serves as the antenna and the headphone line itself serves as the frequency selection sub-circuit of the antenna
  • S3401 and S3402 are two switch switches that control the short-circuit connection of the frequency selection sub-circuit, and are used in FM and HIFI (high-quality sound) modes
  • the switching of the control is to ensure that the impedance of the ground wire of the headphone cable is small enough in the HIFI mode and to improve
  • the signals of the two functional interfaces CC1 and CC2 on the Type-C interface on the terminal are detected, and the non-earphone and headset functions are identified according to the different voltage values of the signals detected.
  • the Type-C interface on the terminal is the default In the state (that is, no external device is connected, USB or charger is connected), in order to ensure the good shielding effect of the cable shielding layer, the switches S3401 and S3402 in Figure 6 are closed at this time, so that the shielding layer of the headphone cable can be fully Grounding. In practical applications, when the shielding layer is fully grounded, the grounding terminal of the headphone cable is also fully grounded, because in general, the grounding terminal of the headphone cable and the shielding layer are connected together.
  • the controller will control the interface to the audio mode, that is, the switch S3401 and S3402 in the frequency selection control circuit of the control device are closed, and the codec (codec) is instructed to start the Type-C headphone plug in and out.
  • the switch S3400 is controlled to make the correct audio path MIC and GND in a conducting state.
  • the switches S3401 and S3402 In FM working mode, the switches S3401 and S3402 must be in the off state at the same time.
  • the SEL signals of the two switches are controlled by the GPIO of the AP to make them in the off state.
  • the layer is in a high-impedance state with respect to the ground of the motherboard in the frequency mode of FM operation. The purpose of this control is to prevent the FM antenna signal from leaking to the ground of the motherboard, resulting in poor reception performance of the FM antenna.
  • the ON state will cause the leakage of the antenna signal.
  • the FM can work normally.
  • the ground wire inside the shield layer is basically unable to receive the antenna signal because it is wrapped by the external shield layer.
  • the received signal mainly comes from the shield layer ground wire of the headphone line. This way, the problem of poor signal when the headphone cable with an external shield is used as an FM antenna is perfectly overcome.
  • the headphone cable with Type-C interface is not provided with a shielding layer, even if there is no external ground shielding layer, it will not affect the normal operation of the FM circuit, because there is no effect of the shielding layer.
  • the energy of the antenna is completely provided by the ground wire of the earphone cable. The energy received by the ground wire of the earphone cable can fully meet the requirements of the receiving performance when it is used as an antenna.
  • the signals FM_ANTENNA1 and FM_ANTENNA2 in Figure 6 are the two FM antenna receiving signals. You can freely choose the stronger signal according to the strength of the two signals. If the outer layer of the headset has a shielding layer, then just use FM_ANTENNA1.
  • HIFI high-quality sound effect mode In order to ensure high-quality sound effects, the impedance of the ground end of the headphone cable to the ground end of the motherboard is sufficiently small, and in order to use the shielding layer to reduce external interference audio signals, due to the existence of the frequency selection subcircuit, this impedance Failure to meet our requirements will result in both sound quality and the shielding effect of the shielding layer.
  • two switches S3401 and S3402 In order to overcome the impact of the high impedance of the frequency selection sub-circuit, two switches S3401 and S3402 need to be used.
  • the GPIO of the AP controls the SEL ports of these two switches to be turned on at the same time.
  • the on-resistance of the two switches is much smaller than the impedance of the frequency selection sub-circuit.
  • the parallel impedance will be greater than the on-resistance of the switches.
  • the impedance is still small, especially on headphone lines with an external ground shield, which performs better, because this is equivalent to two switches with low on-resistance in parallel, then the on-resistance will be less than half of the on-resistance of a switch. The effect is better.
  • the transfer switches S3401 and S3402 can be implemented by using a low-impedance switch, as shown in FIG. 7, and the connection method applied to a specific circuit is shown in FIG. 8.
  • the earphone line multiplexing method provided in this embodiment is provided with a frequency selection circuit between the shield layer of the earphone line and the ground end of the earphone line and the ground end of the terminal, so as to ensure that the antenna energy is not leaked to the ground of the terminal.
  • antenna performance is guaranteed, while the shielding effect of the metal shielding layer of the Type-C headphone cable and the high-quality sound effect of the headphones are ensured.
  • the Type-C headphone cable with a shielding layer is implemented to implement the function of transmitting and receiving antennas (such as FM ) Compatibility with HIFI can make the product more competitive.
  • This embodiment provides a headphone line multiplexing device that can be applied to various mobile terminals.
  • the terminal here is a terminal provided with a Type-C interface
  • the headphone line is also a headphone cable provided with a Type-C headphone interface.
  • the device includes a frequency selection control circuit 81, an acquisition module 82, and a control module 83, where:
  • the frequency selection control circuit 81 is disposed between the Type-C interface of the terminal and the ground of the terminal;
  • the obtaining module 82 is configured to obtain the current working status of the terminal, which includes the FM function status and the non-FM function status.
  • the non-FM function status may be an audio status, a charging status, a USB status, etc., that is, a non-FM function status. It can be all functional states except Type-C interface except FM function state.
  • the control module 83 is configured to control the frequency selection control circuit to work in the frequency modulation working mode according to the frequency modulation function status when the current working status detected by the acquisition module 82 is the frequency modulation function status; and the current detection status detected by the acquisition module 82
  • the frequency selection control circuit is controlled to work in a non-FM mode according to the non-FM function state.
  • the frequency selection control circuit is set between the ground of the terminal and the metal shell (that is, the ground pin) of the Type-C interface, so as to prevent the earphone cable from being directly connected to the terminal after being connected to the Type-C interface. Ground.
  • the device further includes a detection module 84 for detecting whether a Type-C interface on the terminal is plugged into a headphone line. If a headphone line is detected to be plugged in, the frequency selection control circuit is generated according to the current working state. Control signal and notify the control module 83 to control the working mode of the frequency selection control circuit 81.
  • control signal refers to a control signal for opening and closing the Type-C interface.
  • the specific detection module 84 After detecting that the earphone line (91) is inserted, the specific detection module 84 outputs a corresponding signal according to the current working status of the terminal.
  • the control signal (high level or low level) controls the switching switch (812) of the operation of the frequency selection control circuit 81.
  • the configuration channel specifically refers to the ports corresponding to the CC1 and CC2 pins in the Type-C interface.
  • the level on the ports corresponding to the CC1 and CC2 pins is low, then When a headset cable is plugged in, it is also detected that an audio-type application is started on the terminal, that is, playing audio, so that it can be determined that the terminal is in a headset function state.
  • the level on the ports corresponding to the two pins of CC1 and CC2 is low level, it indicates that a headphone cable is inserted, and it is also detected that an FM application such as a radio is started on the terminal, so that the terminal can be determined In the state of FM function, it is necessary to use the inserted headphone cable as an antenna to receive external RF signals.
  • the inserted device is a non-headphone line device.
  • the frequency selection control circuit 81 added in this embodiment specifically includes a frequency selection sub-circuit 811 and a switch 812, and the two are connected in parallel.
  • the frequency selection sub-circuit 811 is Used for frequency selection processing in the FM function.
  • the selector switch 812 is used to control the short-circuit connection of the frequency selection sub-circuit. When the selection switch is on, the frequency selection sub-circuit does not work. When it is off, the frequency selection sub-circuit is connected in series to the terminal. Between the metal shell of the Type-C interface and the ground of the terminal, so as to realize the compatible use of the FM function and the headphone function of the headphone cable.
  • the frequency selection sub-circuit 811 is specifically an LC frequency selection circuit, that is, a frequency selection circuit composed of a capacitor and an inductor. As shown in FIG. 5, the frequency selection sub-circuit 811 is connected in parallel with each other. The capacitor element and the inductor are composed of a changeover switch 812 connected in parallel to the frequency selection sub-circuit 811. One end of the frequency selection control circuit 81 is connected to the headphone line, and the other end is connected to the ground of the terminal, that is, the ground on the motherboard of the terminal. ⁇ ⁇ End connection.
  • the switch 811 In the FM working mode, the switch 811 is in the off state.
  • the SEL signal of the control switch is used to make it in the off state. This can ensure that the ground wire of the headphone line and the metal shielding layer outside the headphone line are in the frequency mode of FM work.
  • the ground end relative to the terminal is in a high-impedance state, thereby ensuring that the headphone cable can normally receive external RF signals.
  • the switch 811 In HIFI high-quality sound mode, the switch 811 is turned on by controlling the SEL port of the switch.
  • the impedance of the switch 811 in the turned-on state is much smaller than the impedance of the frequency selection sub-circuit 812, then the switch 811 is turned on.
  • the parallel impedance will be smaller than the impedance of the switch 811 itself, thereby realizing the grounding treatment of the earphone line, and shielding the audio signal of the earphone line from external signals through the shielding layer of the earphone line.
  • a frequency selection control circuit is provided between the Type-C interface on the terminal and the ground of the terminal, so that the antenna energy is not leaked to the ground of the terminal.
  • the antenna performance is guaranteed; at the same time, when the earphone line is not required to implement the antenna function, the shielding effect of the metal shielding layer of the Type-C earphone line and the high-quality sound effect of the earphone are also guaranteed.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • This embodiment provides a mobile terminal.
  • a headphone cable 91, a Type-C interface 92 provided with a Type-C headphone interface, and a headphone line multiplexing device 80 provided in Embodiment 3 are provided.
  • the frequency selection control circuit 81 in the line multiplexing device 80 is disposed between the ground of the Type-C interface 92 and the ground of the mobile terminal;
  • the headphone line multiplexing device 80 controls the frequency selection control circuit 81 to output a low-level control when the Type-C interface 92 is inserted into the headphone line 91 and the terminal works in a frequency modulation function state.
  • the switch disconnects the earphone line 91 from the ground terminal of the mobile terminal on the path of the switch; that is, if the potential of the configuration channel pin in the Type-C interface 92 is low, then
  • the FM function status controls the frequency selection control circuit 81, and connects the earphone line 91 to the ground terminal of the mobile terminal through the frequency selection control circuit 81; the FM function status here is by detecting an application program started on the terminal to make sure.
  • the frequency selection control circuit 81 If the terminal works in a non-FM function state, the frequency selection control circuit 81 outputs a high-level control switch to short the earphone line 91 and the ground of the mobile terminal; that is, to detect the Type-C
  • the potential of the pin of the configuration channel in the interface 92 is a low level, and the frequency selection control circuit 81 is shorted in combination with the non-frequency modulation function state control, and the earphone line 91 is directly connected to the ground terminal of the mobile terminal.
  • the non-FM function status is also determined by detecting the application program launched on the terminal.
  • the ground terminal in the Type-C interface 92 on a mobile terminal is generally connected to the ground terminal on the motherboard of the terminal, but it is not necessarily connected to the metal shell of the terminal.
  • you can also set two A frequency selection control circuit 81 is implemented. One frequency selection control circuit 81 is connected to the metal shell of the Type-C interface 92 and then grounded, and the other frequency selection control circuit 81 is connected to the ground of the Type-C interface 92 and then grounded.
  • the metal casing of the Type-C headphone interface on the headphone cable 91 is connected to the metal casing of the Type-C interface 92.
  • the metal of the Type-C headphone interface is The shell will pass through the frequency selection control circuit 81 and then be grounded; and the ground terminal on the headphone cable 91 is connected to the ground terminal of the Type-C interface 92.
  • the ground terminal of the headphone cable 91 will also pass through the frequency selection control circuit 81 and then Ground.
  • the mobile terminal can realize the selection and use of the frequency modulation mode and the audio mode by controlling the switch 812 on the frequency selection control circuit 81.
  • the above-mentioned control of the frequency selection control circuit 81 may be specifically implemented by the processor of the mobile terminal, that is, the headset line in the mobile terminal provided in this embodiment is not necessarily the group part of the mobile terminal.
  • the frequency selection control circuit 81 must be that the structure of the mobile terminal can also be set as shown in FIG. 11.
  • the mobile terminal includes a processor 101, a memory 102, a communication bus 103, a frequency selection control circuit 81, and a Type-C interface 92 connected to the frequency selection control circuit 81;
  • the communication bus 103 is used to implement a communication connection between the processor 101 and the memory 102;
  • the processor 101 is configured to execute one or more programs stored in the memory 102 to implement the following steps:
  • the working status includes a frequency modulation function status and a non-frequency modulation function status
  • the frequency selection control circuit 81 controls the frequency selection control circuit 81 to work in a frequency modulation working mode according to the frequency modulation function state;
  • the frequency selection control circuit 81 is controlled to work in a non-FM mode according to the non-FM function state.
  • the processor 101 executes a program to detect the working state, it specifically detects the level and potential on the ports corresponding to the CC1 and CC2 pins of the Type-C interface on the motherboard.
  • the level and potential and the type of the application program started by the terminal determine whether the inserted earphone cable is used to play audio or to receive radio frequency signals from the antenna.
  • the started application program is an FM application, radio frequency transmission and reception are performed, otherwise the non-FM mode is used.
  • an embodiment of the present invention also provides a computer-readable storage medium.
  • the computer-readable storage medium includes any computer-readable storage medium for storing information such as computer-readable instructions, data structures, computer program modules, or other data. Volatile or non-volatile, removable or non-removable media implemented in a method or technology.
  • Computer-readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory, Read-Only Memory), EEPROM (Electrically Erasable, Programmable, Read-Only Memory, and Erasable Programmable Read-Only Memory) ), Flash memory or other memory technology, CD-ROM (Compact Disc Read-Only Memory), digital versatile disk (DVD) or other optical disk storage, magnetic box, magnetic tape, disk storage or other magnetic storage devices, Or any other medium that can be used to store desired information and can be accessed by a computer.
  • RAM Random Access Memory
  • ROM Read-Only Memory
  • Read-Only Memory Read-Only Memory
  • EEPROM Electrically Erasable, Programmable, Read-Only Memory, and Erasable Programmable Read-Only Memory
  • Flash memory or other memory technology
  • CD-ROM Compact Disc Read-Only Memory
  • DVD digital versatile disk
  • the computer-readable storage medium in this embodiment may be used to store one or more computer programs, and the stored one or more computer programs may be executed by a processor, so as to implement the method of multiplexing the earphone line in the first embodiment. At least one step.
  • This embodiment also provides a computer program, which may be distributed on a computer-readable medium and executed by a computable device, so as to implement at least one step of the headphone line multiplexing method in the first embodiment, and In some cases, at least one of the steps shown or described may be performed in a different order than that described in the above embodiments.
  • This embodiment also provides a computer program product, including a computer-readable device.
  • the computer-readable device stores a computer program as shown above.
  • the computer-readable device may include a computer-readable device as shown above. Read storage media.
  • the method and device for multiplexing the earphone line, mobile terminal, and storage medium provided in the embodiments of the present invention, by setting a frequency selection control circuit between the Type-C interface on the terminal and the ground of the terminal, according to the terminal ’s
  • the current working state controls the operation of the frequency selection control circuit, thereby avoiding that the headphone line is directly connected to the terminal's ground when accessing the Type-C interface on the terminal, which affects the performance index of the headphone line when it is used as an antenna.
  • the frequency selection control circuit is controlled to work in the FM working mode, so that the earphone line is not directly connected to the ground of the terminal, which prevents the metal shielding layer of the earphone line from being directly grounded, and the antenna signal is blocked.
  • the phenomenon of shielding solves the problem that the shielding layer affects the antenna index.
  • the headset is not required to implement the FM function, it also ensures the high-quality sound of the headset. This design not only achieves the compatibility of the FM function and the headset function, but also The receiving performance when the earphone line is used as an antenna is improved, and the user experience is improved.
  • a communication medium typically contains computer-readable instructions, data structures, computer program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and may include any information delivery medium. Therefore, the present invention is not limited to any specific combination of hardware and software.

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  • Engineering & Computer Science (AREA)
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  • Computer Networks & Wireless Communication (AREA)
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  • Acoustics & Sound (AREA)
  • Headphones And Earphones (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

本发明实施例提供一种耳机线复用方法及装置、移动终端，通过在终端上的Type-C接口与终端的地端之间设置选频控制电路，在终端的工作状态为调频功能状态时，控制选频控制电路工作于调频工作模式，使得耳机线与终端的地端不直接连接，避免了耳机线的金属屏蔽层直接接地而导致天线信号被屏蔽的现象，解决了屏蔽层影响耳机线作为天线时的接收指标的问题，同时在不需要耳机实现调频功能时，同样保证了耳机的高品质音效，通过这样的设计不仅实现了FM功能和耳机功能的兼容问题，还提高了耳机线作为天线时的接收性能，提高了用户的使用体验。

Description

耳机线复用方法及装置、移动终端
本申请要求享有2018年08月07日提交的名称为“耳机线复用方法及装置、移动终端、存储介质”的中国专利申请CN201810890101.9的优先权，其全部内容通过引用并入本文中。
技术领域
本发明实施例涉及但不限于终端技术领域，具体而言，涉及但不限于一种耳机线复用方法及装置、移动终端。
背景技术
随着终端接口一体化的设计，尤其是USB接口用作耳机、充电等功能接口的一体化，如果在USB接口上增加设置实现FM(调频)功能的话，其设计方法就是使用耳机的地线或者左右声道作为低频(比如FM)的接收和发射天线，在实际应用中建议使用地线作为天线，但是如果耳机设有屏蔽层的话，左右声道作为天线的接收性能将会被屏蔽层收到影响。
目前采用Type-C接口实现耳机功能的终端，主要是采用以下两种方式：
方式一，是采用Type-C/3.5mm转接头，这种方式跟上面传统USB+3.5mm耳机实现方法完全一致；
方式二，是直接采用Type-C接口设计而成的耳机，接口定义见标准协议，这种耳机目前在市场上面比较少见，主要还是以Type-C/3.5mm转接头的方式出现的。
对于直接使用Type-C接口实现耳机功能的终端来说，如果需要使用Type-C耳机作为低频(比如FM)天线的接收和发射天线跟普通的3.5mm耳机有很大区别，Type-C耳机是借用的USB接口，耳机接口处有跑道型金属片1保护，具体如图1所示，耳机上的Type-C接口处的金属圈2与耳机线外围的金属屏蔽层(图中未示出)相连接，在耳机接入终端上的USB使用时，耳机外面的金属圈与USB的保护金属片接触，在应用中，为了保证USB、耳机线金属屏蔽层的屏蔽效果，USB的保护金属片一般都是直接接地处理，由于耳机线上面金属屏蔽层的存在，且在连接到终端USB座上后，金属屏蔽层直接跟终 端的接地端相连接，如果此时使用耳机内部的地线或者左右声道作为天线的话，效果会非常差，根本无法达到理想效果，且对地选频网络的高阻抗会大大影响耳机的音频效果。
发明内容
本发明实施例提供的一种耳机线复用方法及装置、移动终端，主要解决的技术问题是：针对于现有的Type-C接口的耳机线由于金属屏蔽层直接跟终端的接地端相连接，难以实现FM和音频的兼容使用的技术问题。
为解决上述技术问题，本发明实施例提供一种耳机线复用方法，所述耳机线包括Type-C耳机接口，所述方法包括：
在终端的Type-C接口与终端的地端之间设置选频控制电路；
获取所述终端当前的工作状态，所述工作状态包括调频功能状态和非调频功能状态；
若所述终端当前的工作状态为调频功能状态时，根据所述调频功能状态控制所述选频控制电路工作于调频工作模式；
若所述终端当前的工作状态为非调频功能状态时，根据所述耳机功能状态控制所述选频控制电路工作于非调频工作模式。
为解决上述技术问题，本发明实施例还提供了一种耳机线复用装置，包括：选频控制电路、获取模块和控制模块，其中：
所述选频控制电路设置于终端的Type-C接口与终端的地端之间；
所述获取模块用于检测所述终端当前的工作状态，所述工作状态包括调频功能状态和非调频功能状态；
所述控制模块用于在所述获取模块获取到的当前的工作状态为调频功能状态时，根据所述调频功能状态控制所述选频控制电路工作于调频工作模式；以及在所述获取模块获取到的当前的工作状态为非调频功能状态时，根据所述非调频功能状态控制所述选频控制电路工作于非调频工作模式。
为解决上述技术问题，本发明实施例还提供了一种移动终端，包括设有Type-C耳机接口的耳机线、Type-C接口和如上所述的耳机线复用装置，所述耳机线复用装置中的选频控制电路设置于所述Type-C接口的地端与所述移动终端的地端之间；
所述耳机线复用装置在所述Type-C接口插入所述耳机线的状态下，且所述终端工作在调频功能状态时，控制所述选频控制电路输出低电平控制切换开关将所述耳机线与所述移动终端的地端断开；
若所述终端工作在非调频功能状态时，所述选频控制电路输出高电平控制切换开关短接所述耳机线与所述移动终端的地端。
为解决上述技术问题，本发明实施例还提供了移动终端，包括处理器、存储器、通信总线选频控制电路，以及与所述选频控制电路连接的Type-C接口；
所述通信总线用于实现所述处理器与所述存储器之间的通信连接；
所述处理器用于执行存储器中存储的一个或者多个程序，以实现如上所述的耳机线复用方法的步骤。
本发明的有益效果是：
根据本发明实施例提供的耳机线复用方法及装置、移动终端，通过在终端上的Type-C接口与终端的地端之间设置选频控制电路，根据终端的当前的工作状态来控制选频控制电路的工作，从而避免了耳机线在接入终端上的Type-C接口时会直接与终端的地端连接而影响了耳机线作为天线使用时的性能指标。具体的在工作状态为调频功能状态时，控制选频控制电路工作于调频工作模式，使得耳机线与终端的地端不直接连接，避免了耳机线的金属屏蔽层直接接地，而导致天线信号被屏蔽的现象，解决了屏蔽层影响天线指标的问题，同时在不需要耳机实现调频功能时，同样保证了耳机的高品质音效，通过这样的设计不仅实现了FM功能和耳机功能的兼容问题，还提高了耳机线作为天线时的接收性能，提高了用户的使用体验。
本发明其他特征和相应的有益效果在说明书的后面部分进行阐述说明，且应当理解，至少部分有益效果从本发明说明书中的记载变的显而易见。
附图说明
图1为现有的Type-C接口的连接示意图；
图2为Type-C接口的引脚信号定义示意图；
图3为本发明实施例一的耳机线复用方法流程示意图；
图4为本发明实施例一的耳机线复用方法的另一流程示意图
图5为本发明实施例二的选频控制电路原理示意图；
图6为本发明实施例二的终端上的Type-C接口部分电路示意图；
图7为本发明实施例的切换开关的内部结构示意图；
图8为本发明实施例二的终端上的Type-C接口部分电路的另一种示意图；
图9为本发明实施例三的耳机复用装置的结构示意图；
图10为本发明实施例四的移动终端的结构示意图；
图11为本发明实施例四的移动终端的另一种结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，下面通过具体实施方式结合附图对本发明实施例作进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例一：
针对于现有的Type-C接口作为USB多功能一体化设计中，如图2所示，由于USB和耳机共用了此接口，音频的信号和USB信号有复用的部分，DP、DN和耳机的左右声道复用，S1-S4是USB接口的外部金属外壳，如果Type-C耳机对接到终端主板上的该接口后，耳机线上面的屏蔽层就会连接到该金属外壳上面，在目前的终端电子线路设计中，默认该接口上的金属外壳直接与终端的地端连接的。由于目前的耳机线设计中，为了提高耳机的音频质量，在耳线的外围都设置有屏蔽层，该屏蔽层是与耳机接口的地线连接的，因此在使用时，屏蔽层是直接接地，从而造成了耳机作为天线时，其功率会大幅度地衰减，对此本发明实施例提供了一种将Type-C接口的金属外壳不能够直接接地的复用控制方法来解决上述的问题。
本实施例提供的耳机线复用方法，参见图3所示，对于该实施例提供的耳机线复用方法主要是应用于实现采用终端上的Type-C接口作为耳机接口以及将耳机线兼用天线实现FM功能。具体的，该方法包括：
S301：在终端的Type-C接口上设置一个选频控制电路，通过选频控制电路与终端的地端连接。
在本实施例中，这里的选频控制电路设置在终端的地端和Type-C接口的金属外壳(即是接地引脚)之间，用于将Type-C接口上的接地引脚悬浮起来，避免耳机线在接到终端的Type-C接口时，耳机线的地端直接连接到终端的地端上。
S302：获取终端当前的工作状态。
在本实施例中，该工作状态包括调频(即FM)功能状态和非调频功能状态，并且该工作状态是在终端上的Type-C接口在插入了耳机线的状态下的工作状态，其中非调频功能状态具体可以是音频状态，充电状态，USB状态等状态，即是非调频功能状态可以是除了调频功能状态之外的所有可以使用Type-C接口的功能状态。
在实际应用中，该工作状态可以终端通过上层应用的打开来获取，具体的终端首先打开上层应用(比如FM、音乐等)，终端根据该应用来控制选频控制电路进行相应的操作，即断开还是闭合。
在该步骤之后，还应当包括检测所述终端上的Type-C接口是否有USB或者耳机线插入，在实际应用中，对于Type-C接口插入的USB和插入耳机线过程中的接通以及触发的信号也是不相同的，终端可以根据这些参数可以检测到接入的是耳机线还是USB，当检测到接入的是耳机线时，则执行步骤S303。
S303：根据获取到的工作状态控制选频控制电路的工作模式。
在该步骤中，该工作模式包括调频模式和非调频工作模式，分别是对应于FM功能和耳机功能等功能的工作模式，非调频工作模式具体可以是高品质音效模式，充电模式，USB模式等模式，即是非调频工作模式可以是除了调频工作模式之外的所有可以使用Type-C接口的功能模式。
在该步骤中，当获取到终端的当前的工作状态是调频功能状态时，则终端需要将选频控制电路调整至调频模式下，即是将选频控制电路串联接入在Type-C接口的金属外壳和终端的地端之间，从而避免耳机线的接口地端和屏蔽层直接接地，提高耳机线在此功能工作频率下对地的阻抗。
当获取到的终端的工作状态是在非调频功能状态(如音频状态或者耳机功能状态)下时，则控制选频控制电路工作于高品质音效模式下，即是将选频控制电路短接，将耳机线上的接口的地端和屏蔽层直接与终端的地端连接，降低耳机线对地的阻抗，从而实现对外接信号的屏蔽，减少外接信号对耳机线中的音频信号造成干扰。
在本实施例中，在检测所述终端上的Type-C接口是否有USB或者耳机线插入之后，若有插入耳机线(91)，则所述终端根据当前的工作状态产生所述选频控制电路的控制信号。
在检测Type-C接口是否有USB或者耳机线插入步骤中，具体通过检测所述Type-C 接口(92)中的配置通道引脚的电位；
若所述电位有发生变化，且所述电位为低电平，则确定为有所述耳机线(91)插入；
若所述电位为非低电平，则所述Type-C接口(92)插入为非耳机线的设备。
在实际应用中，通过检测终端上的Type-C接口上的配置通道引脚的电位来实现终端是否存在耳机线的插入，并根据插入的耳机线以及终端的当前工作状态来实现对选频控制电路的工作模式进行控制操作，其处理步骤如图4所示：
首先通过执行步骤S401后，并在步骤S402中检测到终端的Type-C接口有耳机线插入后，执行步骤S403。
对于步骤S402中的耳机线的插入检测具体可以通过检测接口上的电位的变化来实现，当接口上的引脚电位出现了变化，且都为低电平时，则说明有耳机线接入，反之则说明所述Type-C接口(92)插入为非耳机线的设备。
S403：获取终端当前的工作状态。
该步骤中，在获取终端的工作状态具体是根据通过检测终端上的相关应用程序的启动情况，若终端在插入耳机线的状态下启动了调频类的应用程序，例如收音机，则执行步骤S405，反之则执行步骤S404，例如启动的是音乐应用，则执行步骤S404。
在本实施例中，对于步骤S402具体是通过检测Type-C接口上的配置通道的电位情况，该配置通道具体指的是Type-C接口中的CC1和CC2两个引脚对应的端口，Type-C接口的引脚信号定义如图2所示，终端通过检测这两个端口上的电位即可实现对耳机线的插入识别。
S404：根据耳机功能状态控制选频控制电路工作于高品质音效模式。
S405：根据调频功能状态控制选频控制电路工作于调频工作模式。
在实际应用中，当所述电位为高电平，则因为耳机线直接接地处理了，因此所述耳机线处于所述非调频功能状态；
当所述电位为低电平，则设定的功能是FM功能，因为耳机线是通过选频控制电路后再与终端的地端连接，因此所述耳机线处于所述调频功能状态。
为了便于控制所述两种工作模式，本实施例中增加的选频控制电路具体是包括选频子电路和切换开关，并且两者是采用并联的连接方式，选频子电路是用于在FM功能时的选频处理，切换开关是用于控制选频子电路的短路连接，当切换开关接通时选频子电路不工作，其断开时选频子电路串联在终端的Type-C接口的金属外壳与终端的地端之 间，从而实现对耳机线的FM功能和耳机功能的兼容使用。
本实施例提供的耳机线复用方法，通过在耳机线的屏蔽层以及耳机线的地端与终端的接地端之间设置选频电路，这样就保证了天线能量不会被泄露到终端的接地端上，保证了天线性能；同时在不需要耳机线实现天线功能时，同样保证了Type-C耳机线金属屏蔽层的屏蔽效果以及耳机的高品质音效。
实施例二：
下面结合具体的实现电路结构来对本发明实施例提供耳机线复用方法进行详细说明，参见图5和6所示，本实施例提供在终端的Type-C接口出设置两个选频控制电路，分别连接在耳机线上屏蔽层与终端的地端之间以及耳机线与终端的地端之间。
如图5所示，该选频控制电路包括选频子电路和切换开关，其中选频子电路由相互并联连接的电容器件和电感器组成、或者是采用在特定频率下高阻抗的磁珠形成，切换开关并联在选频子电路上，所述选频控制电路一端与耳机线连接，另一端与终端的地端连接，即是与终端的主板上的大地端连接。
如图6，为终端的Type-C接口处的电路原理图，图中USB3400是终端上的主板的USB连接器(即是Type-C接口)，用于连接USB线或者Type-C耳机线；S3400是一个切换控制开关，主要用于Type-C耳机线正反插时，控制耳机线上的MIC和GND的切换；电容器C3401和C3403、电感器L3403以及电容器C3402和C3404、电感器L3404分别构成耳机线上的屏蔽层作为天线以及耳机线本身作为天线的选频子电路；S3401和S3402为两个控制选频子电路短路连接的切换开关，用于在FM和HIFI(高品质音效)模式下的控制切换，切换的目的是为了保证HIFI模式下耳机线的地线阻抗足够小和提高耳机线上的屏蔽层的屏蔽效果。
在本实施例中，在终端的Type-C接口出设置两个选频控制电路的基础上，当Type-C接口上插入带有Type-C接口的耳机线时，其实现对耳机线的相互切换使用的控制过程为：
首先检测终端上的Type-C接口上的CC1和CC2两个功能接口的信号，根据其检测到的信号的不同电压值来实现非耳机和耳机功能的识别，终端上的Type-C接口在默认状态下(即没有外部设备接入、USB或者充电器接入状态)，为了保证线缆屏蔽层良好的屏蔽效果，此时图6中的开关S3401和S3402闭合，让耳机线的屏蔽层能够充分接地，在实际应用中，在屏蔽层充分接地的同时耳机线的接地端也是充分接地的，因为在一般 情况下耳机线的接地端和屏蔽层是连接在一起的。
若检测到Type-C接口的CC1和CC2两个接口的信号上面都检测出来是低电平，那么就可以判断是Type-C接口类型的耳机，即是耳机线应当是用于听音乐或者只传输音频信号的，控制器就会将接口控制为音频模式，即是控制器件选频控制电路中的切换开关S3401和S3402闭合，并告知codec(编译码器)开始进行Type-C耳机正反插的检测工作，根据检测结果控制开关S3400让正确的音频通路MIC和GND处于导通状态。下面就分两种工作模式：FM工作模式和HIFI音频模式对本实施例的耳机线服用过程进行说明：
在FM工作模式下，开关S3401和S3402必须同时处于断开状态，通过AP的GPIO控制两个开关的SEL信号使其处于断开状态，这样可以保证耳机线的地线和耳机线外的金属屏蔽层在FM工作的频率模式下相对于主板的地端是高阻状态，这样控制的目的是防止FM天线信号泄露到主板的地端上，导致FM天线的接收性能效果变差，任何一个处于导通状态都会造成天线信号的泄露，此时FM能够正常工作，屏蔽层内部的地线由于被外部屏蔽层包裹着基本无法收到天线信号，接收到的信号主要来自于耳机线的屏蔽层地线的信号，这样就完美克服了拥有外部地屏蔽层的耳机线作为FM天线时信号差的问题。
在实际应用中，还有一种可能就是带有Type-C接口的耳机线没有设置屏蔽层，即是没有外部的地屏蔽层也不会影响FM电路的正常工作，因为没有了屏蔽层的影响，天线的能量完全由耳机线的地线来提供，耳机线的地线所接收的能量完全可以满足其作为天线时的接收性能的要求。
图6中信号FM_ANTENNA1和FM_ANTENNA2是FM的两个天线接收信号，可以根据两个信号的强弱自由选择其中更强的信号，如果耳机外层有屏蔽层，那么仅仅使用FM_ANTENNA1即可。
在HIFI高品质音效模式下，为了保证高品质音效需要耳机线的地端到主板的地端阻抗足够小，同时为了利用屏蔽层减小外部干扰音频信号，由于选频子电路的存在，这个阻抗无法满足我们的要求，导致音质和屏蔽层的屏蔽效果都会受到影响，为了克服选频子电路的高阻抗带来的影响，需要使用两个开关S3401和S3402，在HIFI高品质音效模式下，通过AP的GPIO控制这两个开关的SEL端口使其同时导通，两个开关的导通阻抗远远小于选频子电路的阻抗，那么两个开关导通时，并联阻抗将比开关的导通阻抗还小，特别是在有外部地屏蔽层的耳机线上表现的更加优秀，因为这样相当于两个低导通阻抗的开关并联，那么导通阻抗将小于一个开关的导通阻抗的一半，效果更佳。在实际 应用中，所述切换开关S3401和S3402可以采用一种低阻抗的开关来实现，如图7所示的开关，其应用于具体电路上的连接方式如图8所示。
本实施例提供的耳机线复用方法，通过在耳机线的屏蔽层以及耳机线的地端与终端的接地端之间设置选频电路，这样就保证了天线能量不会被泄露到终端的接地端上，保证了天线性能，同时保证了Type-C耳机线金属屏蔽层的屏蔽效果以及耳机的高品质音效，解决了拥有屏蔽层的Type-C耳机线线缆实现收发天线的功能(比如FM)和HIFI兼容的问题，可以让产品更有竞争力。
实施例三：
本实施例提供了一种耳机线复用装置，该装置可应用于各种移动终端上，这里的终端是设有Type-C接口的终端，耳机线也是设有Type-C耳机接口的耳机线，参见图9所示，该装置包括：选频控制电路81、获取模块82和控制模块83，其中：
选频控制电路81设置于终端的Type-C接口与终端的地端之间；
获取模块82用于获取终端当前的工作状态，该工作状态包括调频功能状态和非调频功能状态，其中所述非调频功能状态可以是音频状态，充电状态，USB状态等状态，即是非调频功能状态可以是除了调频功能状态之外的所有可以使用Type-C接口的功能状态。
控制模块83用于在获取模块82检测到的当前的工作状态为调频功能状态时，根据所述调频功能状态控制所述选频控制电路工作于调频工作模式；以及在获取模块82检测到的当前的工作状态为非调频功能状态时，根据所述非调频功能状态控制所述选频控制电路工作于非调频工作模式。
在本实施例中，这里的选频控制电路设置在终端的地端和Type-C接口的金属外壳(即是接地引脚)之间，避免耳机线在接到Type-C接口直接连接到终端的地端上。
在实际应用中，所述装置还包括检测模块84用于检测终端上的Type-C接口是否有插入耳机线，若检测到有耳机线插入时，根据当前的工作状态产生所述选频控制电路的控制信号，并通知控制模块83对选频控制电路81的工作模式进行控制。
在本实施例中，该控制信号指的是对Type-C接口的断开和闭合的控制信号，具体的检测模块84在检测到耳机线(91)插入以后，根据终端当前的工作状态输出相应的控制信号(高电平或者低电平)控制选频控制电路81的工作的切换开关(812)。
在实际应用中，配置通道具体指的是Type-C接口中的CC1和CC2两个引脚对应的端口，当CC1和CC2两个引脚对应的端口上的电平为低电平时，则说明有耳机线插入，同时还检测到终端上启动了音频类的应用程序，即是播放音频，由此可判断出终端处于耳机功能状态。
当CC1和CC2两个引脚对应的端口上的电平为低电平时，则说明有耳机线插入，同时还检测到终端上启动了调频类的应用程序，例如收音机，由此可判断出终端处于调频功能状态，即是需要将插入的耳机线作为天线使用，用于接收外界的射频信号。
当CC1和CC2两个引脚对应的端口上的电平为非低电平时，则说明插入的设备为非耳机线设备。
为了便于控制所述两种工作模式，本实施例中增加的选频控制电路81具体是包括选频子电路811和切换开关812，并且两者是采用并联的连接方式，选频子电路811是用于在FM功能时的选频处理，切换开关812是用于控制选频子电路的短路连接，当切换开关接通时选频子电路不工作，其断开时选频子电路串联在终端的Type-C接口的金属外壳与终端的地端之间，从而实现对耳机线的FM功能和耳机功能的兼容使用。
在实际应用中，所述选频子电路811具体是采用的LC选频电路，即是由电容器和电感器组成的选频电路，如图5所示，选频子电路811由相互并联连接的电容器件和电感器组成，切换开关812并联在选频子电路811上，所述选频控制电路81一端与耳机线连接，另一端与终端的地端连接，即是与终端的主板上的大地端连接。
在FM工作模式下，切换开关811处于断开状态，通过控制开关的SEL信号使其处于断开状态，这样可以保证耳机线的地线和耳机线外的金属屏蔽层在FM工作的频率模式下相对于终端的地端是高阻状态，从而保证耳机线可以正常接收到外界的射频信号。
在HIFI高品质音效模式下，通过控制开关的SEL端口使切换开关811处于导通状态，切换开关811在导通状态下的阻抗远远小于选频子电路812的阻抗，那么切换开关811导通时，并联阻抗将比切换开关811的本身的阻抗还小，从而实现了耳机线的接地处理，很好地通过耳机线的屏蔽层屏蔽了外界信号对耳机线的音频信号的干扰。
本实施例提供的耳机线复用装置，通过在终端上的Type-C接口与终端的地端之间设置选频控制电路，这样就保证了天线能量不会被泄露到终端的接地端上，保证了天线性能；同时在不需要耳机线实现天线功能时，同样保证了Type-C耳机线金属屏蔽层的屏蔽效果以及耳机的高品质音效。
实施例四：
本实施例提供了一种移动终端，参见图10所示，设有Type-C耳机接口的耳机线91、Type-C接口92和如实施例三提供的耳机线复用装置80，所述耳机线复用装置80中的选频控制电路81设置于所述Type-C接口92的地端与所述移动终端的地端之间；
所述耳机线复用装置80在所述Type-C接口92插入所述耳机线91的状态下，且所述终端工作在调频功能状态时，控制所述选频控制电路81输出低电平控制切换开关将所述耳机线91与所述移动终端的地端在切换开关这个通路上面断开；即是检测所述Type-C接口92中的配置通道引脚的电位为低电平，则结合调频功能状态控制所述选频控制电路81，将所述耳机线91通过所述选频控制电路81与所述移动终端的地端连接；这里的调频功能状态是通过检测终端上启动的应用程序来确定。
若所述终端工作在非调频功能状态时，所述选频控制电路81输出高电平控制切换开关短接所述耳机线91与所述移动终端的地端；即是检测所述Type-C接口92中的配置通道引脚的电位为低电平，则结合非调频功能状态控制短接所述选频控制电路81，将所述耳机线91与所述移动终端的地端直接连接，同时非调频功能状态也是通过检测终端上启动的应用程序来确定。
在实际应用中，移动终端上的Type-C接口92中的地端一般是与终端的主板上的地端连接的，但是不一定是与终端的金属外壳连接，对于此，还可以通过设置两个选频控制电路81来实现，一个选频控制电路81与Type-C接口92的金属外壳连接后再接地，另一个选频控制电路81与Type-C接口92的地端连接后再接地。
也即是在耳机线91接入到Type-C接口92后，耳机线91上的Type-C耳机接口的金属外壳与Type-C接口92的金属外壳连接，这时Type-C耳机接口的金属外壳就会经过选频控制电路81后再接地；而耳机线91上的地端与Type-C接口92的地端连接，这时耳机线91的地端也会经过选频控制电路81后再接地。
这时移动终端就可以通过控制选频控制电路81上的切换开关812来实现调频模式和音频模式的选择使用。
在本实施例中，对于上述的对选频控制电路81的控制具体可以通过移动终端的处理器来实现，即是本实施例提供的移动终端中的耳机线并一定就是移动终端的组部分，但是选频控制电路81一定是，即是该移动终端的结构还可以设置为如图11所示的结构。
如图11所示，所述移动终端包括处理器101、存储器102、通信总线103、选频控制电路81，以及与所述选频控制电路81连接的Type-C接口92；
通信总线103用于实现处理器101与存储器102之间的通信连接；
处理器101用于执行存储器102中存储的一个或者多个程序，以实现以下步骤：
获取所述终端当前的工作状态，所述工作状态包括调频功能状态和非调频功能状态；
若终端当前的工作状态为调频功能状态时，根据所述调频功能状态控制所述选频控制电路81工作于调频工作模式；
若终端当前的工作状态为非调频功能状态时，根据所述非调频功能状态控制所述选频控制电路81工作于非调频工作模式。
在实际应用中，处理器101在执行程序实现工作状态的检测时，具体是检测主板上的Type-C接口中的CC1和CC2两个引脚对应的端口上的电平电位，根据检测到的电平电位以及终端启动的应用程序的类别来确定插入的耳机线是用于播放音频还是实现天线接收射频信号，当启动的应用程序是调频应用，则执行射频的收发，反之则非调频模式。
相对应的，本发明实施例还提供了一种计算机可读存储介质，该计算机可读存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、计算机程序模块或其他数据)的任何方法或技术中实施的易失性或非易失性、可移除或不可移除的介质。计算机可读存储介质包括但不限于RAM(Random Access Memory，随机存取存储器),ROM(Read-Only Memory，只读存储器),EEPROM(Electrically Erasable Programmable read only memory，带电可擦可编程只读存储器)、闪存或其他存储器技术、CD-ROM(Compact Disc Read-Only Memory，光盘只读存储器)，数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。
本实施例中的计算机可读存储介质可用于存储一个或者多个计算机程序，其存储的一个或者多个计算机程序可被处理器执行，以实现如上述实施例一中的耳机线复用方法的至少一个步骤。
本实施例还提供了一种计算机程序，该计算机程序可以分布在计算机可读介质上，由可计算装置来执行，以实现上述实施例一中的耳机线复用方法的至少一个步骤，并且在某些情况下，可以采用不同于上述实施例所描述的顺序执行所示出或描述的至少一个步骤。
本实施例还提供了一种计算机程序产品，包括计算机可读装置，该计算机可读装置上存储有如上所示的计算机程序，本实施例中该计算机可读装置可包括如上所示的计算机可读存储介质。
综上所述，本发明实施例提供的耳机线复用方法及装置、移动终端、存储介质，通过在终端上的Type-C接口与终端的地端之间设置选频控制电路，根据终端的当前的工作状态来控制选频控制电路的工作，从而避免了耳机线在接入终端上的Type-C接口时会直接与终端的地端连接，从而影响了耳机线作为天线使用时的性能指标。具体的在工作状态为调频功能状态时，控制选频控制电路工作于调频工作模式，使得耳机线与终端的地端不直接连接，避免了耳机线的金属屏蔽层直接接地，而导致天线信号被屏蔽的现象，解决了屏蔽层影响天线指标的问题，同时在不需要耳机实现调频功能时，同样保证了耳机的高品质音效，通过这样的设计不仅实现了FM功能和耳机功能的兼容问题，还提高了耳机线作为天线时的接收性能，提高了用户的使用体验。
可见，本领域的技术人员应该明白，上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件(可以用计算装置可执行的计算机程序代码来实现)、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。
此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、计算机程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。所以，本发明不限制于任何特定的硬件和软件结合。
以上内容是结合具体的实施方式对本发明实施例所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。

Claims (11)

  1. 一种耳机线复用方法，其中，所述耳机线(91)包括Type-C耳机接口，所述方法包括：
    在终端的Type-C接口(92)与终端的地端之间设置选频控制电路(81)；
    获取所述终端当前的工作状态，所述工作状态包括调频功能状态和非调频功能状态；
    若所述终端当前的工作状态为调频功能状态时，根据所述调频功能状态控制所述选频控制电路(81)工作于调频工作模式；
    若所述终端当前的工作状态为非调频功能状态时，根据所述非调频功能状态控制所述选频控制电路(81)工作于非调频工作模式。
  2. 如权利要求1所述的耳机线复用方法，其中，在获取所述终端当前的工作状态之后，还包括：
    检测所述终端上的Type-C接口(92)是否有插入耳机线(91)；
    若有插入耳机线(91)，则所述终端根据当前的工作状态产生所述选频控制电路的控制信号。
  3. 如权利要求2所述的耳机线复用方法，其中，所检测所述终端上的Type-C接口(92)是否有插入耳机线(91)包括：
    检测所述Type-C接口(92)中的配置通道引脚的电位；
    若所述电位有发生变化，且所述电位为低电平，则确定为有所述耳机线(91)插入；
    若所述电位为非低电平，则所述Type-C接口(92)插入为非耳机线的设备。
  4. 如权利要求1-3任一项所述的耳机线复用方法，其中，所述选频控制电路(81)包括：并联连接的选频子电路(811)和切换开关(812)；
    根据所述调频功能状态控制所述选频控制电路(81)工作于调频工作模式包括：控制所述切换开关(812)处于断开状态，将所述Type-C耳机接口通过所述选频子电路(811)与终端的地端连接；
    根据所述非调频功能状态控制所述选频控制电路(81)工作于非调频工作模式包括：控制所述切换开关(812)处于闭合状态，将所述选频子电路(811)短接，所述Type-C耳机接口与所述终端的地端直接连接。
  5. 一种耳机线复用装置，其中，包括：选频控制电路(81)、检获取模块(82)和控制模块(83)，其中：
    所述选频控制电路(81)设置于终端的Type-C接口(92)与终端的地端之间；
    所述采集模块(82)用于获取所述终端当前的工作状态，所述工作状态包括调频功能状态和非调频功能状态；
    所述控制模块(83)用于在所述获取模块(82)获取到的当前的工作状态为调频功能状态时，根据所述调频功能状态控制所述选频控制电路(81)工作于调频工作模式；以及在所述获取模块(82)获取到的当前的工作状态为非调频功能状态时，根据所述非调频功能状态控制所述选频控制电路(81)工作于非调频工作模式。
  6. 如权利要求5所述的耳机线复用装置，其中，还包括检测模块(84)，用于检测所述终端上的Type-C接口(92)是否有插入耳机线(91)若有插入耳机线(91)，则所述终端根据当前的工作状态产生所述选频控制电路(81)的控制信号。
  7. 如权利要求6所述的耳机线复用装置，其中，所述检测模块(84)用于检测所述Type-C接口(92)中的配置通道引脚的电位；
    若所述电位有发生变化，且所述电位为低电平，则确定为有所述耳机线(91)插入；
    若所述电位为非低电平，则所述Type-C接口(92)插入为非耳机线的设备。
  8. 如权利要求5-7任一项所述的耳机线复用装置，其中，所述选频控制电路(81)包括：并联连接的选频子电路(811)和切换开关(812)；
    所述控制模块(83)用于在当前的所述工作状态为调频功能状态时，控制所述切换开关(811)处于断开状态，将所述Type-C耳机接口通过所述选频子电路与终端的地端连接；
    以及，用于在当前的所述工作状态为非调频功能状态时，控制所述切换开关(811)处于闭合状态，将所述选频子电路(812)短接，所述Type-C耳机接口与所述终端的地端直接连接。
  9. 如权利要求8所述的耳机线复用装置，其中，所述切换开关为低阻抗开关。
  10. 一种移动终端，其中，包括设有Type-C耳机接口的耳机线(91)、Type-C接口(92)和如权利要求5-9任一项所述的耳机线复用装置，所述耳机线复用装置中的选频控制电路(81)设置于所述Type-C接口(92)的地端与所述移动终端的地端之间；
    所述耳机线复用装置在所述Type-C接口(92)插入所述耳机线(91)的状态下，且 所述终端工作在调频功能状态时，控制所述选频控制电路(81)输出低电平控制切换开关将所述耳机线(91)与所述移动终端的地端断开；
    若所述终端工作在非调频功能状态时，所述选频控制电路(81)输出高电平控制切换开关短接所述耳机线(91)与所述移动终端的地端。
  11. 一种移动终端，包括处理器(101)、存储器(102)、通信总线(103)、选频控制电路(81)，以及与所述选频控制电路(81)连接的Type-C接口(92)；
    所述通信总线(103)用于实现所述处理器(101)与所述存储器(102)之间的通信连接；
    所述处理器(101)用于执行存储器(102)中存储的一个或者多个程序，以实现如权利要求1至4任一项所述的耳机线复用方法的步骤。
PCT/CN2019/099559 2018-08-07 2019-08-07 耳机线复用方法及装置、移动终端 WO2020029990A1 (zh)

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