CN106714030B - Earphone circuit - Google Patents
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- CN106714030B CN106714030B CN201510438578.XA CN201510438578A CN106714030B CN 106714030 B CN106714030 B CN 106714030B CN 201510438578 A CN201510438578 A CN 201510438578A CN 106714030 B CN106714030 B CN 106714030B
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Abstract
The invention discloses an earphone circuit, which comprises: the earphone comprises an earplug, a microphone, interfaces, a detection module and a functional module, wherein the detection module is respectively connected with each interface and used for detecting interface signals of the interfaces and sending out a control signal according to the interface signals, the functional module receives the control signal and selectively exchanges data with the interfaces according to the control signal, and the detection module controls the interfaces to exchange data with the functional module, so that the multifunction of the earphone is realized, and the earphone can be flexibly applied to various functions.
Description
Technical Field
The invention relates to the technical field of audio devices, in particular to an earphone circuit.
Background
In recent years, portable audio playback apparatuses have been widely proliferated. For example, audio output is performed through headphones, thereby providing sound to the user. Headsets are an essential peripheral electronic device in modern electronic devices (cell phones or tablets, etc.).
However, the existing earphone has only one audio interface, such as an analog interface (i.e. a conventional audio plug) or a digital interface (e.g. a USB interface), which greatly limits the use of the earphone due to the single number and type of the interfaces.
Disclosure of Invention
The invention aims to provide an earphone circuit, which integrates the earphone circuit with a data line, improves the integration level of equipment and saves materials.
To solve the above technical problem, the present invention provides an earphone circuit, including:
an earplug;
a microphone;
an interface;
the detection module is respectively connected with the interfaces, detects the interface signals of the interfaces and sends out a control signal according to the interface signals; and
and the functional module is electrically connected with the detection module, receives the control signal and selectively exchanges data with the interface according to the control signal.
Further, in the earphone circuit, the function module includes an audio processing module, the audio processing module is electrically connected to the ear plug, the microphone, and the detection module, respectively, and the audio processing module receives the control signal and selectively performs data exchange with the interface according to the control signal.
Further, in the headphone circuit,
the detection module comprises an interface characteristic detection unit, the interface characteristic detection unit detects the characteristics of data on the interface, judges whether the interface signal is an analog audio signal or a digital audio signal and sends out an audio control signal;
the audio processing module comprises an audio codec and an analog switch, the audio codec and the analog switch are respectively connected with the interface, the earplug and the microphone, and the analog switch receives the audio control signal;
when the interface signal of the interface is an analog audio signal, the audio control signal controls the analog switch to be closed, and the analog audio signal is short-circuited to the earplug and/or the microphone; when the interface signal of the interface is a digital audio signal, the analog switch is switched off, and the audio codec drives the earplug and/or the microphone.
Further, in the headphone circuit, the characteristics of the data on the interface include a high level, a low level, a variation frequency, a multi-value level, a multi-value logic level, or an analog level.
Further, in the earphone circuit, the function module further includes a bluetooth transceiver module, the bluetooth transceiver module is connected to the audio processing module and the detection module, the detection module includes an electrical performance detection unit, the electrical performance detection unit detects the electrical connection state of the interface, and the electrical performance detection unit sends a bluetooth control signal to the bluetooth transceiver module to control the bluetooth transceiver module to be turned on, turned off or configured for data transmission between the bluetooth transceiver module and the interface.
Further, in the earphone circuit, when the interface is connected to an external electronic device, if the external electronic device is in a call prompt state or in a call state before the interface is connected to the external electronic device, the bluetooth control signal controls to close the bluetooth transceiver module; when the interface is pulled out of the external electronic equipment, if the external electronic equipment is in a call prompt state or in a call state before the interface is pulled out of the external electronic equipment, the Bluetooth control signal controls to start the Bluetooth transceiver module.
Further, in the earphone circuit, the earphone circuit further includes a battery management module, and the battery management module is electrically connected to the interface.
Further, in the earphone circuit, the battery management module is connected to the detection module, and the detection module sends a control signal to the battery management module to control the on/off of the battery management module and the configuration of the battery management module matched with the interface.
Further, in the headphone circuit,
the detection module comprises an equipment characteristic detection unit, and the equipment characteristic detection unit detects whether the external electronic equipment of the interface is in an active state or a passive state and sends an equipment characteristic signal;
the battery management module comprises an energy storage element and an electric energy guiding unit, and the electric energy guiding unit is respectively connected with each interface, the equipment characteristic detection unit and the energy storage element;
when the device characteristic detection unit detects that the external electronic device of the interface is in an active state, the battery management module carries out internal charging, and the device characteristic signal controls the interface to supply power to the energy storage element; when the device characteristic detection unit detects that the external electronic device of the interface is in a passive state, the battery management module supplies power to the outside, and the device characteristic signal controls the energy storage element to supply power to the interface.
Further, in the earphone circuit, the electric energy guiding unit is a bidirectional switch power supply or a bidirectional current-limiting voltage stabilizing unit.
Further, in the earphone circuit, the battery management module is connected to a power line of each interface and/or a data line of each interface, so as to configure the battery management module to perform internal charging or external power supply.
Further, in the headphone circuit, the headphone circuit includes two or more of the interfaces.
Further, in the earphone circuit, the interfaces are in signal connection with each other.
Further, in the earphone circuit, the interfaces are different types of interfaces.
Further, in the earphone circuit, the earphone circuit further includes a handshake recognition module, the handshake recognition module is respectively connected to the interfaces, a communication protocol is provided in the handshake recognition module, when the interfaces are respectively connected to an external electronic device, the handshake recognition module recognizes the external electronic device according to the communication protocol, and configures the function module to establish communication with the external electronic device.
Further, in the earphone circuit, the interface is an analog interface, a digital interface or a power interface.
Further, in the earphone circuit, the earphone circuit includes one of the earplugs, and the earphone circuit further includes:
an external audio plug;
the external earplug is connected with the external audio plug;
and the connector is matched with the interface, is connected with the external audio plug, and is detachably connected with the interface.
Compared with the prior art, the earphone circuit provided by the invention has the following advantages:
in the headphone circuit provided by the present invention, the headphone circuit includes: compared with the prior art, the earphone comprises an earplug, a microphone, an interface, a detection module and a functional module, wherein the detection module is respectively connected with the interface and used for detecting an interface signal of the interface and sending a control signal according to the interface signal, the functional module receives the control signal and selectively exchanges data with the interface according to the control signal, and the detection module controls the interface and the functional module to exchange data, so that the multifunction of the earphone is realized, and the earphone can be flexibly applied to various functions.
Drawings
Fig. 1 is a schematic diagram of an earphone circuit according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of an audio processing module according to a first embodiment of the present invention;
FIG. 3 is a circuit diagram of a battery management module according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of an earphone circuit according to a second embodiment of the present invention.
Detailed Description
The headset circuit of the present invention will now be described in more detail with reference to the schematic drawings, in which preferred embodiments of the invention are shown, it being understood that a person skilled in the art may modify the invention described herein while still achieving the advantageous effects of the invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The core idea of the invention is to provide an earphone circuit, which comprises an earphone; a microphone; an interface; the detection module is respectively connected with the interfaces, detects the interface signals of the interfaces and sends out a control signal according to the interface signals; and the functional module is electrically connected with the detection module, receives the control signal and selectively exchanges data with the interface according to the control signal. The earphone circuit controls the interface to exchange data with the functional module through the detection module, so that the earphone is multifunctional, and the earphone can be flexibly applied to various functions.
Several embodiments of the headset circuit are listed below for clarity of illustration of the present disclosure, it should be understood that the present disclosure is not limited to the following embodiments, and other modifications by conventional means of skill in the art are within the scope of the present disclosure.
First embodiment
Fig. 1-3 specifically illustrate a first embodiment of the present invention, wherein fig. 1 is a schematic diagram of an earphone circuit according to the first embodiment of the present invention; FIG. 2 is a circuit diagram of an audio processing module according to a first embodiment of the present invention; FIG. 3 is a circuit diagram of a battery management module according to a first embodiment of the present invention; the headset circuit 1 is used in a headset.
As shown in fig. 1, the headset circuit 1 includes an ear plug 101, a microphone 102, two interfaces 111 and 112, a detection module 120 and a function module 130, wherein the detection module 120 is connected to each of the interfaces 111 and 112, and the detection module 120 detects an interface signal of each of the interfaces 111 and 112 and sends a control signal according to the interface signal. The functional module 130 is electrically connected to the detection module 120, and the functional module 130 receives the control signal and selectively exchanges data with the interfaces 111 and 112 according to the control signal, thereby realizing the multi-functionalization of the earphone. The detection module 120 may use an MCu implementation or a custom circuit to detect parameters such as voltage, current, and load impedance of the interfaces 111 and 112 to determine the device state on the connection line, for example, to simply use a voltage divider resistor to determine the power supply voltage, and an edge trigger circuit to determine the data transmission, which can be understood by those skilled in the art and is not described herein.
In this embodiment, the headset circuit 1 may comprise one or two earpieces, in fig. 1, the headset circuit 1 shows two of the interfaces 111, 112, and in other embodiments of the present invention, the headset circuit 1 may further comprise one, three, four, five or more of the interfaces. Preferably, the interfaces 111, 112 are different types of interfaces, so that the headset can be connected to external electronic devices (such as a mobile phone, a computer, a tablet computer, or a power plug) with various interfaces, and preferably, the interfaces 111, 112 are analog interfaces (such as a conventional audio plug), digital interfaces (such as a USB interface, etc.), or power interfaces. In this embodiment, the interfaces 111 and 112 are in signal connection with each other, so that power can be supplied to or data can be transmitted between the interfaces 111 and 112, and the earphone can be used as a charging line or a data line.
In this embodiment, the functional module 130 includes an audio processing module 131, the audio processing module 131 is electrically connected to the ear plug 101, the microphone 102, the detection module 120, and the interfaces 111 and 112, respectively, and the audio processing module 131 receives the control signal sent by the detection module 120 and selectively exchanges audio data with each of the interfaces 111 and 112 according to the control signal.
Preferably, as shown in fig. 1, the detecting module 120 includes an interface characteristic detecting unit 121, the interface characteristic detecting unit 121 detects a characteristic of data on the interface 111 or 112, and determines that the interface signal V1 is an analog audio signal or a digital audio signal, that is, whether the interface 111 or 112 connected to the external electronic device is a conventional audio plug or a data interface (such as a USB interface, etc.), and the interface characteristic detecting unit 121 sends an audio control signal V2 according to the detection result. The characteristics of the data on the interface 111 or 112 include high level, low level, variation frequency, multi-value level, multi-value logic level or analog level, and so on.
In this embodiment, as shown in fig. 2, the audio processing module 131 includes an audio codec 1311 and an analog switch 1312, the audio codec 1311 and the analog switch 1312 are respectively connected to the interfaces 111 and 112, the ear plug 101, and the microphone 102, and the analog switch 1312 receives the audio control signal V2. When the interface 111 or 112 is connected to an external electronic device, and the interface characteristic detection unit 121 detects that the interface signal V1 of the interface 111 or 112 is an analog audio signal, it indicates that the interface 111 or 112 connected to the external electronic device is an analog interface (e.g., a conventional audio plug), and the audio control signal controls the analog switch 1312 to close V2, so as to short-circuit the analog audio signal V2 to the earplug 101 and/or the microphone 102; when the interface 111 or 112 is connected to an external electronic device, and the interface characteristic detection unit 121 detects that the interface signal V1 of the interface 111 or 112 is a digital audio signal, it indicates that the interface 111 or 112 connected to the external electronic device is a data interface (such as a USB interface, etc.), the analog switch 1312 is turned off, and the audio codec 1311 drives the ear plug 101 and/or the microphone 102. Generally, a data transceiver module may be further included between the audio codec 1311 and the data line of the interface 111 or 112, so as to be used for transceiving data of different protocols (e.g., 12S, uSB, single bit/multi-channel code stream, etc.).
In this embodiment, the headset circuit 1 is used for a bluetooth headset, the function module 130 further includes a bluetooth transceiver module 132, the bluetooth transceiver module 132 is connected to the audio processing module 131 and the detection module 120, the detection module 120 includes an electrical performance detection unit 122, the electrical performance detection unit 122 detects an electrical connection state of the interfaces 111 and 112, and the electrical performance detection unit 122 sends a bluetooth control signal v3 to the bluetooth transceiver module 132 to control the bluetooth transceiver module 132 to turn on, turn off or configure data transmission between the bluetooth transceiver module 132 and the interfaces 111 and 112.
When any one of the interfaces 111 or 112 is connected to an external electronic device:
the earphone and the external electronic equipment start a wired data exchange function, the data type can be audio data or non-audio data, if the data type is audio data, the bidirectional data can realize the call answering function of the wired earphone, and if the data type is unidirectional uplink data, the recording function can be realized; if the data type is any non-audio data, the Bluetooth headset is paired with the host in a wired mode;
the electrical performance detecting unit 122 detects an access action of the interface 111 or 112, and if the interface 111 or 112 is in an incoming call prompt or in a call state before being accessed to the external electronic device, the bluetooth control signal v3 controls to close the bluetooth transceiving module 132, and the external electronic device exchanges audio data with the audio processing module 131 of the earphone circuit 1, thereby implementing a wired call function, or the external electronic device starts a call function of itself.
When any one of the interfaces 111 or 112 is unplugged from an external electronic device:
if the external electronic device is in a call prompt state before the external electronic device is pulled out from the interface 111 or 112, the bluetooth control signal V3 controls to turn on the bluetooth transceiving module 132 to implement wireless connection and wireless communication, and at this time, the pulling-out action can be taken as an answering action;
if the external electronic device is in a communication state before the interface 111 or 112 is pulled out of the external electronic device, that is, the earphone and the external electronic device are in a wired communication state, the bluetooth control signal V3 controls to open the bluetooth transceiving module 132, so as to realize wireless connection and wireless communication.
In this embodiment, as shown in fig. 1, the earphone circuit 1 further includes a battery management module 133, where the battery management module 133 is electrically connected to the interfaces 111 and 112, and when the interfaces 111 and 112 are connected to an external electronic device, the battery management module 133 may be charged through the interfaces 111 and 112. Preferably, the battery management module 133 is connected to the detection module 120, and the detection module 120 sends a control signal to the battery management module 133 to control the battery management module 133 to be turned on or off and the configuration of the battery management module 133 matching with the interface 111 or 112.
Specifically, as shown in fig. 1, the detection module 120 includes a device characteristic detection unit 123, and the device characteristic detection unit 123 detects that an external electronic device of the interface 111 or 112 is in an active state or a passive state, and sends a device characteristic signal V4, where the active state indicates that the external electronic device contains a power source and can provide sufficient power, and the passive state includes that the external electronic device has no power source at all or the power source is exhausted and is not enough to provide power. As shown in fig. 3, the battery management module 133 includes an energy storage element 1331 and a power guiding unit 1332, and the power guiding unit is respectively connected to the interfaces 111 and 112, the device characteristic detecting unit 123, and the energy storage element 1331. The electric energy guiding unit 1332 may control the current to implement bidirectional conduction, and may be a bidirectional switching power supply or a bidirectional current-limiting voltage-stabilizing unit, where the bidirectional switching power supply and the bidirectional current-limiting voltage-stabilizing unit are understood by those skilled in the art and are not described herein again.
When the device characteristic detecting unit 123 detects that an external electronic device of the interface 111 or 112 is in an active state, the device characteristic signal V4 controls a unidirectional current from the interface 111 or 112 to the energy storage element 1331, as shown in a direction D1 in fig. 3, so as to supply power 1331 to the energy storage element by the interface 111 or 112 and charge the internal (the battery management module 133); when the device characteristic detecting unit 123 detects that an external electronic device of the interface 111 or 112 is in a passive state, the device characteristic signal V4 controls a single-way current from the energy storage element 1331 to the interface 111 or 112, as shown in a direction D2 in fig. 3, so that the energy storage element supplies power 1331 to the interface 111 or 112, and external (the external electronic device) power supply is realized.
Preferably, the battery management module 133 is connected to a power line of each interface 111 or 112 and/or a data line of each interface 111 or 112, so as to configure the battery management module 133 to perform internal charging or external power feeding.
Preferably, as shown in fig. 1, the earphone circuit 1 further includes a handshake recognition module 140, where the handshake recognition module 140 is respectively connected to the interfaces 111 and 112, and a communication protocol is arranged in the handshake recognition module and is used for handshaking between the earphone and an external device. When the interface 111 or 112 is connected to an external electronic device, the handshake recognition module 140 recognizes the external electronic device according to the communication protocol, and configures the function module 120 to establish communication with the external electronic device.
In this embodiment, when one of the interfaces of the earphone circuit 1 is connected to a PC and the other interface is connected to a mobile phone, the PC can charge the mobile phone and data exchange between the PC and the mobile phone can be realized; when the earphone circuit 1 has more than three interfaces, when one interface of the earphone circuit 1 is connected with a power plug, the other interface is connected with a mobile phone, and the other interface is connected with the other mobile phone, the power plug can charge the mobile phone and the other mobile phone at the same time, and data exchange between the mobile phone and the other mobile phone can be realized.
Second embodiment
Referring to fig. 4, fig. 4 is a schematic diagram of an earphone circuit according to a second embodiment of the present invention. In fig. 4, reference numerals denote the same components as those of fig. 1 to 3, which represent the same description as the first embodiment. The headphone circuit 2 of the second embodiment is substantially the same as the headphone circuit 1 of the first embodiment, except that: the headphone circuit 2 comprises one of the earpieces 101, the headphone circuit 2 further comprises: external audio plug 201, external earplug 202 and connector 203, external earplug 202 with external audio plug 201 is connected, connector 203 with interface 112 phase-match, connector 203 with interface 112 can dismantle the connection, connector 203 with external audio plug 201 is connected. The headset circuit 2 may further include an external microphone 204.
When the connection port 203 is connected to the interface 112, the detection module 120 detects the state of the interface 112 to send the audio control signal V2, and controls the audio processing module 131 to transmit audio data to the ear plug 101, so that the ear plug 101 and the external ear plug 202 operate simultaneously to form a stereo ear plug.
In addition, when the detection module 120 detects the state of the interface 112, the detection module 120 may also control the operation of the other functional modules 130, which is understood by those skilled in the art according to the above description of the present invention and is not described herein again.
In this embodiment, the earphone circuit 2 may include one or more interfaces, as long as one interface is matched with the connection port 203.
The preferred embodiments of the present invention are described, however, the present invention is not limited to the above-described embodiments, for example:
in the above embodiment, the headset circuit 1 and the headset circuit 1 are used for a bluetooth headset, and the function module 130 further includes a bluetooth transceiver module 132, in other embodiments of the present invention, the headset circuit 1 and the headset circuit 1 are used for a wired headset, and the function module 130 does not include the bluetooth transceiver module 132, which is also within the scope of the present invention;
in another embodiment of the present invention, the earphone circuit 1 may further have only one interface, and the battery management module 133 may also realize bidirectional power supply, and when one interface is a data interface, the data interface may be connected to an analog-to-digital interface converter, and the earphone circuit 1 is connected to an analog interface, so that the earphone circuit 1 may also perform analog/digital earphone mode switching.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. An earphone circuit, comprising:
an earplug;
a microphone;
an interface;
the detection module is respectively connected with the interfaces, detects the interface signals of the interfaces and sends out a control signal according to the interface signals; and
the functional module is electrically connected with the detection module, receives the control signal and selectively exchanges data with the interface according to the control signal;
the functional module comprises an audio processing module, the audio processing module is respectively electrically connected with the earplug, the microphone and the detection module, the audio processing module receives the control signal and selectively exchanges data with the interface according to the control signal;
the detection module comprises an interface characteristic detection unit, the interface characteristic detection unit detects the characteristics of data on the interface, judges whether the interface signal is an analog audio signal or a digital audio signal and sends out an audio control signal;
the audio processing module comprises an audio codec and an analog switch, the audio codec and the analog switch are respectively connected with the interface, the earplug and the microphone, and the analog switch receives the audio control signal;
when the interface signal of the interface is an analog audio signal, the audio control signal controls the analog switch to be closed, and the analog audio signal is short-circuited to the earplug and/or the microphone; when an interface signal of the interface is a digital audio signal, the analog switch is switched off, and the audio codec drives the earplug and/or the microphone;
the earphone circuit also comprises a battery management module which is electrically connected with the interface;
the battery management module is connected with the detection module, and the detection module sends a control signal to the battery management module to control the on and off of the battery management module and the configuration of the battery management module matched with the interface;
the detection module comprises an equipment characteristic detection unit, and the equipment characteristic detection unit detects whether the external electronic equipment of the interface is in an active state or a passive state and sends an equipment characteristic signal;
the battery management module comprises an energy storage element and an electric energy guiding unit, and the electric energy guiding unit is respectively connected with each interface, the equipment characteristic detection unit and the energy storage element;
when the device characteristic detection unit detects that the external electronic device of the interface is in an active state, the battery management module carries out internal charging, and the device characteristic signal controls the interface to supply power to the energy storage element; when the device characteristic detection unit detects that the external electronic device of the interface is in a passive state, the battery management module supplies power to the outside, and the device characteristic signal controls the energy storage element to supply power to the interface;
the battery management module is connected with a power line of each interface and/or a data line of each interface to configure that the battery management module carries out internal charging or external power supply;
the earphone circuit comprises more than two interfaces, the interfaces are in signal connection with each other, the earphone circuit further comprises a handshake identification module, the handshake identification module is respectively connected with the interfaces, a communication protocol is arranged in the handshake identification module, and when the interfaces are respectively connected into an external electronic device, the handshake identification module identifies the external electronic device according to the communication protocol and configures the function module to establish communication with the external electronic device;
when the number of the interfaces is two, when one interface of the earphone circuit is connected with a PC (personal computer) and the other interface of the earphone circuit is connected with a mobile phone, the earphone circuit is used for realizing the charging of the PC to the mobile phone and the data exchange between the PC and the mobile phone; when the number of the interfaces is more than three, when one interface of the earphone circuit is connected with a power plug, the other interface is connected with a mobile phone, and the other interface is connected with the other mobile phone, the earphone circuit is used for realizing that the power plug simultaneously charges the mobile phone and the other mobile phone and realizing data exchange between the mobile phone and the other mobile phone.
2. The headset circuit of claim 1, wherein the characteristic of the data on the interface comprises a high level, a low level, a varying frequency, a multi-valued level, a multi-valued logic level, or an analog level.
3. The headset circuit of claim 1, wherein the function module further comprises a bluetooth transceiver module, the bluetooth transceiver module is connected to the audio processing module and the probing module, the probing module comprises an electrical performance probing unit, the electrical performance probing unit probes the electrical connection status of the interface, and the electrical performance probing unit sends a bluetooth control signal to the bluetooth transceiver module to control the bluetooth transceiver module to turn on, turn off, or configure the bluetooth transceiver module and the interface for data transmission.
4. The headset circuit according to claim 3, wherein when the interface is connected to an external electronic device, if the external electronic device is in a call alert state or a call state before the interface is connected to the external electronic device, the bluetooth control signal controls to turn off the bluetooth transceiver module; when the interface is pulled out of the external electronic equipment, if the external electronic equipment is in a call prompt state or in a call state before the interface is pulled out of the external electronic equipment, the Bluetooth control signal controls to start the Bluetooth transceiver module.
5. The headphone circuit according to claim 1, wherein the power directing unit is a bidirectional switching power supply or a bidirectional current limiting voltage regulator unit.
6. The headset circuit of claim 1, wherein each of the interfaces is a different type of interface.
7. The headset circuit of any of claims 1 to 5, wherein the interface is an analog interface, a digital interface, or a power interface.
8. The headset circuit of any of claims 1-5, wherein the headset circuit includes one of the earplugs, the headset circuit further comprising:
an external audio plug;
the external earplug is connected with the external audio plug;
and the connector is matched with the interface, is connected with the external audio plug, and is detachably connected with the interface.
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| CN201510438578.XA CN106714030B (en) | 2015-07-23 | 2015-07-23 | Earphone circuit |
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| CN106714030A (en) | 2017-05-24 |
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