CN216599997U - Switching circuit and wireless earphone - Google Patents

Abstract

The utility model discloses a switching circuit and a wireless earphone. The switching circuit comprises a first switching module, wherein the first switching module is used for being connected with the main control module, the first socket and the audio module and the wireless signal transceiving module respectively; the second switching module is used for being connected with the audio module and the first socket respectively, and the second switching module is used for being switched on or switched off according to the electric quantity state of the wireless earphone; the detection module is used for respectively connecting the first socket and the power supply, and generating a detection signal according to a first connection state of the first socket and the connecting line or a second connection state of the second socket and the connecting line; the main control module is used for controlling the third connection state of the first switching module according to the detection signal. The wireless earphone can be switched between the wireless mode and the wired mode, the problem that the wireless earphone cannot be used when the wireless earphone is out of power is solved, and different transmission signal quality requirements are met.

Description

Switching circuit and wireless earphone

Technical Field

The utility model relates to the technical field of circuit control, in particular to a switching circuit and a wireless earphone.

Background

Among the correlation technique, the problem of wired wearing formula equipment connecting wire constraint has been solved to wireless wearing formula equipment. However, while solving the above problems, the wireless wearable device also has two new problems: 1. when the wireless wearable device is powered off, the wireless wearable device cannot be used; 2. compared with wired wearable devices, the wireless wearable devices reduce the quality of transmission signals.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a switching circuit which can switch a wireless earphone between a wireless mode and a wired mode, solves the problem that the wireless earphone cannot be used when the wireless earphone is out of power, and meets different transmission signal quality requirements.

The utility model also provides a wireless earphone with the switching circuit.

The switching circuit according to the embodiment of the first aspect of the present invention is applied to a wireless headset, the wireless headset includes a wireless signal transceiving module, an audio module, a first headset and a second headset, the first headset includes a first socket, the second headset includes a second socket, the first socket is connected to the second socket, and the switching circuit includes: the first switching module is used for being connected with a main control module, the first socket, the audio module and the wireless signal transceiving module respectively; the second switching module is used for being connected with the audio module and the first socket respectively, and the second switching module is used for being switched on or switched off according to the electric quantity state of the wireless earphone; the detection module is used for being connected with the first socket and the power supply respectively, and generating a detection signal according to a first connection state of the first socket and a connecting line or a second connection state of the second socket and the connecting line; the main control module is used for controlling a third connection state of the first switching module according to the detection signal so as to control the audio module to be connected with the wireless signal transceiver module or control the audio module to be connected with the first socket.

The switching circuit according to the embodiment of the utility model has at least the following beneficial effects: the connection state of the connecting line with the first socket and the second socket is detected through the detection module, the main control module controls the third connection state of the first switching module according to the connection state so as to control the connection relation between the audio module and the wireless signal receiving and transmitting module and the first socket, and then the wireless mode and the wired mode of the wireless earphone are switched. Moreover, the second switching module in the embodiment of the application can be switched on or off according to the electric quantity state of the wireless earphone, so that when the electric quantity state is no electricity, the second switching module automatically switches the wireless earphone into a mode that the audio module is connected with the first socket, namely, the wired state of the wireless earphone switching module is achieved. Therefore, the embodiment of the application realizes the switching between the wired mode and the wireless mode of the wireless earphone, ensures that the wireless earphone can be switched to the wired mode for continuous use under the power-off state, and can receive high-quality transmission signals (such as audio signals) when the wireless earphone is switched to the wired mode, thereby meeting different transmission signal quality requirements.

According to some embodiments of the utility model, the audio module comprises a microphone unit, a first speaker unit, and a second speaker unit; the first switching module includes: the control end of the first switch is connected with the main control module, the moving end of the first switch is respectively connected with the wireless signal transceiving module and the first socket, and the static end of the first switch is connected with the microphone unit; a control end of the second switch is connected with the main control module, a moving end of the second switch is respectively connected with the wireless signal transceiving module and the first socket, and a static end of the second switch is connected with the first loudspeaker unit; a control end of the third switch is connected with the main control module, a moving end of the third switch is respectively connected with the wireless signal transceiving module and the first socket, and a static end of the third switch is connected with the second loudspeaker unit; the main control module is used for controlling the sub-connection states of the first switch, the second switch and the third switch according to the detection signal so as to control the microphone unit to be connected with the wireless signal transceiving module or the first socket, control the first loudspeaker unit to be connected with the wireless signal transceiving module or the first socket, and control the second loudspeaker unit to be connected with the wireless signal transceiving module or the first socket.

According to some embodiments of the utility model, the first switch, the second switch, and the third switch are double pole double throw switches.

According to some embodiments of the utility model, the second switching module comprises: a fourth switch, a static end of which is connected with the microphone unit, and a moving end of which is connected with the first socket; a fifth switch, a static end of which is connected with the first speaker unit, and a moving end of which is connected with the first socket; a sixth switch, a static end of which is connected with the first speaker unit, and a moving end of which is connected with the first socket; the fourth switch, the fifth switch and the sixth switch are all used for being switched on or off according to the electric quantity state of the wireless earphone.

According to some embodiments of the utility model, the fourth switch, the fifth switch, and the sixth switch are double pole single throw switches.

According to some embodiments of the utility model, the first socket comprises a left channel end, a right channel end, a first ground end, a microphone end, and a second ground end; wherein the first ground terminal and the second ground terminal are connected.

According to some embodiments of the utility model, further comprising: a capacitor, one end of which is connected to one end of the microphone unit; one end of the resistor is connected with the other end of the capacitor, and the other end of the resistor is connected with the other end of the microphone unit; and a static end of the seventh switch is connected with one end of the resistor, and a moving end of the seventh switch is connected with the other end of the microphone unit.

A wireless headset according to an embodiment of the second aspect of the utility model comprises: the switching circuit of the first aspect.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the following figures and examples, in which:

FIG. 1 is a block diagram of a switching circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a switching circuit according to an embodiment of the utility model.

Reference numerals:

the earphone comprises a wireless signal transceiving module 101, an audio module 102, a first earphone 103, a second earphone 104, a first socket 105, a second socket 106, a microphone unit 107, a first speaker unit 108, a second speaker unit 109, a first switching module 201, a main control module 202, a second switching module 203, a detection module 204 and a power supply 205.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.

In the description of the present invention, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the following embodiments, the movable ends of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, and the seventh switch K7 all represent one ends fixedly connected to the "knife" of the corresponding switch; the static ends of the first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6 and the seventh switch K7 all represent one ends which are variably connected with the "knife" of the corresponding switch.

Referring to fig. 1, an embodiment of the present application provides a switching circuit, which is applied to a wireless headset. The wireless headset comprises a wireless signal transceiving module 101, an audio module 102, a first headset 103 and a second headset 104, wherein the first headset 103 comprises a first socket 105, the second headset 104 comprises a second socket 106, and the first socket 105 is connected with the second socket 106. The switching circuit comprises a first switching module 201, a second switching module 203 and a detection module 204, wherein the first switching module 201 is used for being connected with the main control module 202, the first socket 105, the audio module 102 and the wireless signal transceiver module 101 respectively. The second switching module 203 is used for being connected with the audio module 102 and the first socket 105, respectively, and the second switching module 203 is used for being turned on or turned off according to the power state of the wireless headset. The detection module 204 is configured to be connected to the first socket 105 and the power supply 205, respectively, and the detection module 204 is configured to generate a detection signal according to a first connection state of the first socket 105 and the connection line or a second connection state of the second socket 106 and the connection line. The main control module 202 is configured to control the third connection state of the first switching module 201 according to the detection signal, so as to control the audio module 102 to be connected with the wireless signal transceiver module 101, or control the audio module 102 to be connected with the first socket 105.

Specifically, taking a wireless headset as an example of the wireless headset, the first headset 103 represents a headset for receiving a left channel in the wireless headset, and the second headset 104 represents a headset for receiving a right channel in the wireless headset. The first earphone 103 and the second earphone 104 are both provided with a socket (i.e. the first socket 105 and the second socket 106) of 3.5mm, when one end of the connecting wire is inserted into the socket and the other end of the connecting wire is connected with the audio device, the wireless earphone can be switched from the wireless module to the wired mode. It can be understood that, when the wireless headset is in the wireless mode, the wireless headset receives the audio signal through the wireless signal transceiver module 101 and plays the audio signal through the audio module 102.

The detecting module 204 is used for detecting whether the connecting wire is inserted into the first socket 105 or the second socket 106, and generating a corresponding detecting signal. The main control module 202 determines whether the wireless headset needs to be switched from the wireless mode to the wired mode according to the detection signal, for example: when the connection line is not plugged into the first socket 105 and the second socket 106, the detection signal generated by the detection module 204 is a high-level signal provided by the power supply 205, and at this time, the main control module 202 controls the third connection state of the first switching module 201 according to the detection signal, so that the audio module 102 is connected with the wireless signal transceiver module 101, that is, the wireless headset is in a wireless mode at this time; when the connection line is plugged into the first socket 105 or the second socket 106, the detection module 204 generates a low-level detection signal, and at this time, the main control module 202 controls the third connection state of the first switching module 201 according to the detection signal, so that the audio module 102 is connected to the first socket 105, that is, the wireless headset is in the wired mode at this time.

It can be understood that the above-mentioned wireless mode and wired mode of the wireless headset are both in the case that the power state of the wireless headset is power, and at this time, the second switching module 203 is in the off state. When the power state of the wireless headset is in a power-off state, the second switching module 203 is switched to be on according to the power state, so that the audio module 102 is connected with the first socket 105, that is, the wireless headset is automatically switched to the wired mode by the second switching module 203 according to the power state.

The switching circuit provided by the embodiment of the application detects the connection state of the connection line with the first socket 105 and the second socket 106 through the detection module 204, and the main control module 202 controls the third connection state of the first switching module 201 according to the connection state to control the connection relation between the audio module 102 and the wireless signal transceiver module 101 and the first socket 105, thereby realizing the switching between the wireless mode and the wired mode of the wireless headset. In addition, the second switching module 203 of the embodiment of the application can also be turned on or off according to the power state of the wireless headset, so that when the power state is off, the second switching module 203 automatically switches the wireless headset into a mode in which the audio module 102 is connected with the first socket 105, that is, the wireless headset is switched into a wired state. Therefore, the embodiment of the application realizes the switching between the wired mode and the wireless mode of the wireless earphone, ensures that the wireless earphone can be switched to the wired mode for continuous use under the power-off state, and can receive high-quality transmission signals (such as audio signals) when the wireless earphone is switched to the wired mode, thereby meeting different transmission signal quality requirements.

Referring to fig. 2, in some embodiments, the audio module includes a microphone unit 107, a first speaker unit 108, and a second speaker unit 109. The first switching module 201 includes a first switch K1, a second switch K2 and a third switch K3, a control end of the first switch K1 is connected to the main control module, a moving end of the first switch K1 is connected to the wireless signal transceiver module 101 and the first socket 105, and a static end of the first switch K1 is connected to the microphone unit 107. The control end of the second switch K2 is connected with the main control module, the moving end of the second switch K2 is connected with the wireless signal transceiving module 101 and the first socket 105, and the static end of the second switch K2 is connected with the first speaker unit 108. The control end of the third switch K3 is connected to the main control module, the moving end of the third switch K3 is connected to the wireless signal transceiver module 101 and the first socket 105, respectively, and the dead end of the third switch K3 is connected to the second speaker unit 109. The main control module is configured to control the sub-connection states of the first switch K1, the second switch K2 and the third state according to the detection signal, so as to control the connection between the microphone unit 107 and the wireless signal transceiver module 101 or the first socket 105, control the connection between the first speaker unit 108 and the wireless signal transceiver module 101 or the first socket 105, and control the connection between the second speaker unit 109 and the wireless signal transceiver module 101 or the first socket 105.

Specifically, a microphone unit 107 and a first speaker unit 108 are provided in the first headphone 103, and a second speaker unit 109 is provided in the second headphone 104. The main control module is respectively connected to the control terminal of the first switch K1, the control terminal of the second switch K2, and the control terminal of the third switch K3 (not shown in the figure), so as to simultaneously control the sub-connection state of the static terminal and the active terminal of the first switch K1, the sub-connection state of the static terminal and the active terminal of the second switch K2, and the sub-connection state of the static terminal and the active terminal of the third switch K3 according to the detection signal. For example, when the detection signal is a high-level signal, the main control module controls the dead end of the first switch K1 to be connected to the moving end of the wireless signal transceiver module 101, so that the microphone unit 107 is connected to the wireless signal transceiver module 101; controlling the dead end of the second switch K2 to be connected to the moving end of the wireless signal transceiver module 101 side, so that the first speaker unit 108 is connected to the wireless signal transceiver module 101; the dead end of the third switch K3 is controlled to be connected to the moving end on the wireless signal transmission/reception module 101 side, so that the second speaker unit 109 is connected to the wireless signal transmission/reception module 101. When the detection signal is a low level signal, the main control module controls the static end of the first switch K1 to be connected with the moving end of the first socket 105 side, so that the microphone unit 107 is connected with the first socket 105; controlling the dead end of the second switch K2 to be connected to the moving end on the first socket 105 side to connect the first speaker unit 108 to the first socket 105; the dead end of the third switch K3 is controlled to be connected to the moving end of the first socket 105 to connect the second speaker unit 109 to the first socket 105. Therefore, the main control module realizes the control of the wireless earphone to switch between the wireless mode and the wired mode according to the detection signal.

In some embodiments, the first socket 105 includes a left channel terminal L, a first ground terminal GND1, a microphone terminal MIC, and a second ground terminal GND2, and the first ground terminal GND1 is connected to the second ground terminal GND2, so that the first ground terminal GND1 and the second ground terminal GND2 form a short circuit when the connection line is inserted into the first socket 105, thereby generating a low-level detection signal. The first switch K1, the second switch K2, and the third switch K3 are all double-pole double-throw switches (for example, a switch with a model number of SGM 3718), that is, the first switch K1 includes two static ends and four dynamic ends, the two static ends of the first switch K1 are respectively connected to two ends of the microphone unit 107, and the four dynamic ends of the first switch K1 are respectively connected to the wireless signal transceiver module 101, the microphone end MIC of the first socket 105, the internal ground end, and the second ground end GND2 of the first socket 105; the second switch K2 includes two static ends and four moving ends, the two static ends of the second switch K2 are respectively connected with the two ends of the first speaker unit 108, the two moving ends of the second switch K2 are connected with the wireless signal transceiver module 101, and the other two moving ends are respectively connected with the left channel end L of the first socket 105 and the first ground end GND1 of the first socket 105; the third switch K3 includes two fixed terminals and four movable terminals, the two fixed terminals of the third switch K3 are respectively connected to the two terminals of the second speaker unit 109, the two movable terminals of the third switch K3 are connected to the wireless signal transceiver module 101, and the other two movable terminals are respectively connected to the right channel terminal R of the first socket 105 and the internal ground terminal. It is understood that the first switch K1, the second switch K2, and the third switch K3 may also be electronic switches in other forms, and the embodiments of the present application are not limited in particular.

In some embodiments, the second switching module 203 includes a fourth switch K4, a fifth switch K5, and a sixth switch K6. The static end of the fourth switch K4 is connected with the microphone unit 107, and the moving end of the fourth switch K4 is connected with the first socket 105; the dead end of the fifth switch K5 is connected to the first speaker unit 108, and the moving end of the fifth switch K5 is connected to the first jack 105; the dead end of the sixth switch K6 is connected to the second speaker unit 109, and the moving end of the sixth switch K6 is connected to the first receptacle 105. The fourth switch K4, the fifth switch K5 and the sixth switch K6 are all used for being turned on or off according to the power state of the wireless headset.

Specifically, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are electronic switches capable of being automatically switched on or off according to the power state of the wireless headset. For example, when the power state of the wireless headset is powered on, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are all switched to the off state. When the power state of the wireless headset is off, the fourth switch K4, the fifth switch K5 and the sixth switch K6 are all switched to the conducting state, and at this time, the static end of the fourth switch K4 is connected with the moving end of the fourth switch K4, so that the microphone unit 107 is connected with the first socket 105; the dead end of the fifth switch K5 is connected to the moving end of the fifth switch K5 to connect the first speaker unit 108 to the first jack 105; the dead end of the sixth switch K6 is connected to the moving end of the sixth switch K6 to connect the second speaker to the first jack 105. Therefore, when one end of the connecting wire is connected with the first socket 105 or the second socket 106 and the audio equipment at the other end of the connecting wire is connected, the wireless earphone can acquire the audio signal according to the wired state switched.

In some specific embodiments, the fourth switch K4, the fifth switch K5, and the sixth switch K6 are all double-pole single-throw switches (such as switches of type FSA 553), that is, the fourth switch K4 includes two fixed terminals and two moving terminals, the two fixed terminals of the fourth switch K4 are respectively connected to the two terminals of the microphone unit 107, and the two moving terminals of the fourth switch K4 are respectively connected to the microphone terminal MIC of the first socket 105 and the second ground terminal GND2 of the first socket 105; the fifth switch K5 includes two static ends and two moving ends, the two static ends of the fifth switch K5 are respectively connected with the two ends of the first speaker unit 108, and the two moving ends of the fifth switch K5 are respectively connected with the left channel end L of the first socket 105 and the first ground end GND1 of the first socket 105; the third switch K3 includes two fixed terminals and two moving terminals, the two fixed terminals of the third switch K3 are respectively connected to the two terminals of the second speaker unit 109, and the two moving terminals of the third switch K3 are respectively connected to the right channel terminal R of the first socket 105 and the second ground terminal GND2 of the first socket 105. It is understood that the fourth switch K4, the fifth switch K5, and the sixth switch K6 may also be other types of electronic switches, and the embodiments of the present application are not particularly limited.

Referring to fig. 2, in some embodiments, the switching circuit further includes a capacitor C, a resistor R, and a seventh switch K7. One end of the capacitor C is connected to one end of the microphone unit 107; one end of the resistor R is connected to the other end of the capacitor C, and the other end of the resistor R is connected to the other end of the microphone unit 107; the dead end of the seventh switch K7 is connected to one end of the resistor R, and the moving end of the seventh switch K7 is connected to the other end of the microphone unit 107.

Specifically, the capacitor C, the resistor R, and the seventh switch K7 constitute a circuit for controlling the muting of the microphone unit 107. The seventh switch K7 is connected in parallel with a resistor R, which is connected in series with a capacitor C. When the user controls the seventh switch K7 to be turned on, i.e., controls the dead end of the seventh switch K7 to be connected with the moving end of the seventh switch K7, the resistor R is short-circuited, thereby controlling the microphone unit 107 to be "muted".

The embodiment of the present application further provides a wireless headset, including the switching circuit described in any of the above embodiments.

It can be seen that, the contents in the foregoing switching circuit embodiment are all applicable to the embodiment of the wireless headset, the functions implemented in the embodiment of the wireless headset are the same as those in the foregoing switching circuit embodiment, and the beneficial effects achieved by the embodiment of the wireless headset are also the same as those achieved by the foregoing switching circuit embodiment.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

Claims (8)

1. Switching circuit is applied to wireless earphone, wireless earphone includes wireless signal transceiver module, audio module, first earphone and second earphone, its characterized in that, first earphone includes first socket, the second earphone includes the second socket, first socket with the second socket is connected, switching circuit includes:

the first switching module is used for being connected with a main control module, the first socket, the audio module and the wireless signal transceiving module respectively;

the second switching module is used for being connected with the audio module and the first socket respectively, and the second switching module is used for being switched on or switched off according to the electric quantity state of the wireless earphone;

the detection module is used for being connected with the first socket and the power supply respectively, and generating a detection signal according to a first connection state of the first socket and a connecting line or a second connection state of the second socket and the connecting line;

the main control module is used for controlling a third connection state of the first switching module according to the detection signal so as to control the audio module to be connected with the wireless signal transceiver module or control the audio module to be connected with the first socket.

2. The switching circuit of claim 1, wherein the audio module comprises a microphone unit, a first speaker unit, and a second speaker unit;

the first switching module includes:

the control end of the first switch is connected with the main control module, the moving end of the first switch is respectively connected with the wireless signal transceiving module and the first socket, and the static end of the first switch is connected with the microphone unit;

a control end of the second switch is connected with the main control module, a moving end of the second switch is respectively connected with the wireless signal transceiving module and the first socket, and a static end of the second switch is connected with the first loudspeaker unit;

a control end of the third switch is connected with the main control module, a moving end of the third switch is respectively connected with the wireless signal transceiving module and the first socket, and a static end of the third switch is connected with the second loudspeaker unit;

the main control module is used for controlling the sub-connection states of the first switch, the second switch and the third switch according to the detection signal so as to control the microphone unit to be connected with the wireless signal transceiving module or the first socket, control the first loudspeaker unit to be connected with the wireless signal transceiving module or the first socket, and control the second loudspeaker unit to be connected with the wireless signal transceiving module or the first socket.

3. The switching circuit of claim 2, the first switch, second switch, third switch being double pole double throw switches.

4. The switching circuit of claim 2, wherein the second switching module comprises:

a fourth switch, a static end of which is connected with the microphone unit, and a moving end of which is connected with the first socket;

a fifth switch, a static end of which is connected with the first speaker unit, and a moving end of which is connected with the first socket;

a sixth switch, a static end of which is connected with the first speaker unit, and a moving end of which is connected with the first socket;

the fourth switch, the fifth switch and the sixth switch are all used for being switched on or off according to the electric quantity state of the wireless earphone.

5. The switching circuit of claim 4, wherein the fourth switch, the fifth switch, and the sixth switch are all double-pole, single-throw switches.

6. The switching circuit according to any one of claims 2 to 5, wherein the first socket comprises a left channel terminal, a right channel terminal, a first ground terminal, a microphone terminal, and a second ground terminal; wherein the first ground terminal and the second ground terminal are connected.

7. The switching circuit of claim 6, further comprising:

a capacitor, one end of which is connected to one end of the microphone unit;

one end of the resistor is connected with the other end of the capacitor, and the other end of the resistor is connected with the other end of the microphone unit;

and a static end of the seventh switch is connected with one end of the resistor, and a moving end of the seventh switch is connected with the other end of the microphone unit.

8. A wireless headset, comprising: a switching circuit as claimed in any one of claims 1 to 7.

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