Earphone device and control method of earphone device

Abstract

The present application provides an earphone device and a control method thereof. The earphone device includes a headband, an earphone, a sensing circuit, a judging circuit and a microcontroller. The earphone is coupled to an end of the headband. The sensing circuit is disposed on the headband. The sensing circuit provides a sensing value corresponding to a stretching change of the headband according to the stretching change of the headband. The judging circuit compares the sensing value with a first reference value to generate a first judging signal, and compares the sensing value with a second reference value to generate a second judging signal. The microcontroller controls the earphone to enter one of a power-on state and a power-off state according to the first judging signal and the second judging signal.

Description

Technical Field

[0001] This invention relates to an earphone device and a control method for the earphone device, and more particularly to an earphone device and a control method for the earphone device having a sensing function for the stretching change of the headband. Background Technology

[0002] Current commercially available headphones utilize infrared (IR) proximity sensors or capacitive sensors to detect when the headphones are being worn. IR proximity sensors detect wear based on the distance between the ear and the sensor. However, assembling IR proximity sensors into headphones is more complex, and the assembly cost of headphones with IR proximity sensors is also higher.

[0003] Capacitive sensors detect the wearing of headphones by utilizing changes in capacitance caused by the headphones being worn. However, when the headphones come into contact with metal, these capacitance changes can be interfered with, leading to false positives. Therefore, headphone devices have a relatively high false alarm rate.

[0004] Therefore, providing a headphone device that has the advantages of low cost and improved accuracy of wear detection is one of the key research focuses for those skilled in the art. Summary of the Invention

[0005] This invention relates to an earphone device and a control method for the earphone device, which enables the earphone device to have low cost and improve the accuracy of wear detection.

[0006] According to an embodiment of the present invention, the headphone device includes a headband, headphones, a sensing circuit, a decision circuit, and a microcontroller. The headphones are attached to an end of the headband. The sensing circuit is disposed on the headband. The sensing circuit provides a sensed value corresponding to the stretching change of the headband. The decision circuit is coupled to the sensing circuit. The decision circuit compares the sensed value with a first reference value to generate a first decision signal, and compares the sensed value with a second reference value to generate a second decision signal. The microcontroller is coupled to the decision circuit. The microcontroller controls the headphones to enter either a power-on state or a power-off state based on the first decision signal and the second decision signal.

[0007] According to an embodiment of the present invention, the control method is applicable to an earphone device. The earphone device includes a headband, earphones, a sensing circuit, a judgment circuit, and a microcontroller. The earphones are attached to the end of the headband. The control method includes: the sensing circuit providing a sensed value corresponding to the stretching change of the headband; the judgment circuit comparing the sensed value with a first reference value to generate a first judgment signal, and comparing the sensed value with a second reference value to generate a second judgment signal; and the microcontroller controlling the earphones to enter either a power-on state or a power-off state based on the first judgment signal and the second judgment signal.

[0008] Based on the above, the headphone's sensing circuit provides a sensed value corresponding to the stretching change of the headband. The headphone device controls its state based on this sensed value. The sensing circuit is located within the headband. Assembling the sensing circuit is relatively simple, thus reducing the assembly cost of the headphone device. Furthermore, since the headphone device controls its state based on the sensed value corresponding to the stretching change of the headband, the sensed value is not susceptible to interference from external metal or electrodes, preventing erroneous operation. This allows the headphone device to achieve high accuracy. Attached Figure Description

[0009] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of an earphone device according to an embodiment of the present invention.

[0011] Figure 2 This is a schematic diagram illustrating the configuration of a sensing circuit, a judgment circuit, and a microcontroller according to an embodiment of the present invention.

[0012] Figure 3 This is a flowchart illustrating a control method according to an embodiment of the present invention.

[0013] Figure 4 This is a circuit configuration diagram of an earphone device according to another embodiment of the present invention.

[0014] Figure 5 It is based on Figure 4 The circuit diagram of the headphone device is shown.

[0015] Figure 6 This is a first operational schematic diagram of a judgment circuit according to an embodiment of the present invention.

[0016] Figure 7 This is a second operational schematic diagram of a judgment circuit illustrated according to an embodiment of the present invention.

[0017] Figure 8 This is a third operation schematic diagram of the judgment circuit according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures

[0019] 100: Headphone device; 110: Sensing circuit; 120: Judgment circuit; 130: Microcontroller; 111: Force-resistance sensor; 140: Amplifier circuit; 150: First reference circuit; 160: Second reference circuit; 170: Switching circuit; 180: Operational circuit; 181: Setpoint generator; CP1: First comparator, CP2: Second comparator; E1, E2: Headphones; HB: Headband; OPA1, OPA2, OPA3: Operational amplifiers; Q1, Q2, Q3: Transistors; R1~R13: Resistors; S100: Control method; S110~S130: Steps; SC: Control signal; SS: Sensed value; SSW1, SSW2: Switching signal; TT: Set time; VO1: First judgment signal; VO2: Second judgment signal; VR1: First reference value; VR2: Second reference value; VS: Reference high voltage; VSET: Setpoint. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the protection scope of this application.

[0021] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] Furthermore, in this application, directional terms such as "upper," "lower," "inner," and "outer" are defined relative to the indicated placement of the components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of the components in the accompanying drawings.

[0023] Please also refer to Figure 1 as well as Figure 2 , Figure 1 This is a schematic diagram of an earphone device according to an embodiment of the present invention. Figure 2This is a schematic diagram illustrating the configuration of a sensing circuit, a judgment circuit, and a microcontroller according to an embodiment of the present invention. In this embodiment, the headphone device 100 includes a headband HB, earphones E1 and E2, a sensing circuit 110, a judgment circuit 120, and a microcontroller 130. Earphones E1 and E2 are connected to the ends of the headband HB. Taking this embodiment as an example, earphone E1 is connected to one of the two ends of the headband HB. Earphone E2 is connected to the other of the two ends of the headband HB. This embodiment uses two over-ear headphones as an example. However, this embodiment is not limited to the form or number of earphones in this embodiment. In some embodiments, the headphone device 100 includes a single earphone, for example, including earphone E1 or earphone E2.

[0024] The determination circuit 120 and the microcontroller 130 are disposed on one of the headband HB and the earphones E1 and E2. In this embodiment, the sensing circuit 110 is disposed on the headband HB. The sensing circuit 110 provides a sensing value SS corresponding to the tensile change of the headband HB. In other words, the sensing circuit 110 provides different sensing values ​​SS based on different tensile changes of the headband HB.

[0025] For example, when the headband HB is pulled open, the sensing circuit 110 provides a first sensed value in the sensed value SS. When the headband HB is retracted, the sensing circuit provides a second sensed value in the sensed value SS.

[0026] The determination circuit 120 is coupled to the sensing circuit 110. The determination circuit 120 receives a sensed value SS from the sensing circuit 110. The determination circuit 120 receives a first reference value VR1 and a second reference value VR2. The determination circuit 120 compares the sensed value SS with the first reference value VR1 to generate a first determination signal VO1. The determination circuit 120 compares the sensed value SS with the second reference value VR2 to generate a second determination signal VO2.

[0027] In this embodiment, the microcontroller 130 is coupled to the judgment circuit 120. The microcontroller 130 receives a first judgment signal VO1 and a second judgment signal VO2 from the judgment circuit 120. The microcontroller 130 controls the earphones E1 and E2 to enter either a power-on state or a power-off state based on the first judgment signal VO1 and the second judgment signal VO2. The microcontroller 130 provides a control signal SC based on the first judgment signal VO1 and the second judgment signal VO2 to control the earphones E1 and E2 to enter either a power-on state or a power-off state.

[0028] For example, the microcontroller 130 controls the headphones E1 and E2 to enter the power-on state based on the first judgment signal VO1. As another example, the microcontroller 130 times the duration of the second sensed value. When the duration reaches a set time TT, the microcontroller 130 controls the headphones E1 and E2 to enter the power-off state.

[0029] It is worth mentioning that the sensing circuit 110 of the headphone device 100 provides a sensing value SS corresponding to the stretching change of the headband HB. The headphone device 100 controls the state of headphones E1 and E2 based on the sensing value SS corresponding to the stretching change of the headband HB. The sensing circuit 110 is located on the headband HB. The assembly difficulty of the sensing circuit 110 is low. As a result, the assembly cost of the headphone device 100 is also low. In addition, the headphone device 100 controls the state of headphones E1 and E2 based on the sensing value SS corresponding to the stretching change of the headband HB. The sensing value SS is not affected by interference from external metal or electrodes and will not cause malfunction. As a result, the headphone device 100 can have high judgment accuracy.

[0030] Please also refer to Figure 1 , Figure 2 as well as Figure 3 , Figure 3 This is a flowchart illustrating a control method according to an embodiment of the present invention. In this embodiment, control method S100 is applied to headphone device 100. Control method S100 includes steps S110 to S130. In step S110, sensing circuit 110 provides a sensing value SS corresponding to the stretching change of headband HB based on the stretching change of headband HB. In step S120, judgment circuit 120 compares the sensing value SS with a first reference value VR1 to generate a first judgment signal VO1, and compares the sensing value SS with a second reference value VR2 to generate a second judgment signal VO2. In step S130, microcontroller 130 controls headphones E1 and E2 to enter either a power-on state or a power-off state based on the first judgment signal VO1 and the second judgment signal VO2. The implementation of steps S110 to S130 has been described in previous versions. Figure 1 as well as Figure 2 The embodiments are clearly illustrated and will not be repeated here.

[0031] Please also refer to Figure 1 as well as Figure 4 , Figure 4This is a schematic diagram of the circuit configuration of an earphone device according to another embodiment of the present invention. In this embodiment, the earphone device 100 includes a headband HB, earphones E1 and E2, a sensing circuit 110, a judgment circuit 120, a microcontroller 130, and an amplifier circuit 140. Earphones E1 and E2 are coupled to the ends of the headband HB. The sensing circuit 110 is disposed on the headband HB. The sensing circuit 110 provides a sensed value SS corresponding to the stretching change of the headband HB. The amplifier circuit 140 is coupled to the sensing circuit 110 and the judgment circuit 120. The amplifier circuit 140 amplifies the sensed value SS. The judgment circuit 120 receives the amplified sensed value SS. The judgment circuit 120 compares the sensed value SS with a first reference value VR1 to generate a first judgment signal VO1, and compares the sensed value SS with a second reference value VR2 to generate a second judgment signal VO2. The microcontroller 130 controls the earphones E1 and E2 to enter either the power-on state or the power-off state based on the first judgment signal VO1 and the second judgment signal VO2.

[0032] In this embodiment, after the headphones E1 and E2 are controlled to enter either the power-on or power-off state, the microcontroller 130 enters a sleep state. Furthermore, the microcontroller 130 is awakened by either a change in the level of the first judgment signal VO1 or a change in the level of the second judgment signal VO2. It is worth noting that the microcontroller 130 is awakened when either the level of the first judgment signal VO1 or the level of the second judgment signal VO2 changes.

[0033] For example, when the level of the first judgment signal VO1 is raised from a low voltage level to a high voltage level, the microcontroller 130 is woken up to control the headphones E1 and E2 to enter the power-on state. In other words, the microcontroller 130 is woken up in response to the rising edge of the first judgment signal VO1 to control the headphones E1 and E2 to enter the power-on state.

[0034] When the level of the second judgment signal VO2 is raised from a low voltage level to a high voltage level, the microcontroller 130 is woken up to time the duration of the high voltage level of the second judgment signal VO2. In other words, the microcontroller 130 is woken up in response to the rising edge of the second judgment signal VO2 to time the duration of the high voltage level of the second judgment signal VO2. When the duration reaches a set time TT, the microcontroller 130 controls the headphones E1 and E2 to enter the power-off state. In some embodiments, the microcontroller 130 may time the duration of the low voltage level of the sensed value SS output by the amplifier circuit 140, and when the duration reaches the set time TT, the microcontroller 130 controls the headphones E1 and E2 to enter the power-off state.

[0035] After controlling the headphones E1 and E2, the microcontroller 130 will go into sleep mode. Through intermittent sleep mode, the headphone device 100 can maintain low power consumption when worn.

[0036] In this embodiment, the headphone device 100 further includes a reference circuit and a switching circuit 170. The reference circuit includes a first reference circuit 150 and a second reference circuit 160. The first reference circuit 150 is coupled to a determination circuit 120. The first reference circuit 150 provides a first reference value VR1 in a power-off state and stops providing the first reference value VR1 in a power-on state. The second reference circuit 160 is coupled to a microcontroller 130. The second reference circuit 160 provides the first reference value VR1 in the power-on state. The switching circuit 170 connects the second reference circuit 160 to the determination circuit 120 during the period when the first reference circuit 150 stops providing the first reference value VR1. The switching circuit 170 disconnects the second reference circuit 160 from the determination circuit 120 during the period when the first reference circuit 150 provides the first reference value VR1.

[0037] The first reference circuit 150 provides a first reference value VR1 when headphones E1 and E2 are in the off state. The second reference circuit 160 provides the first reference value VR1 when headphones E1 and E2 are in the on state.

[0038] In this embodiment, the headphone device 100 further includes a calculation circuit 180. The calculation circuit 180 is coupled to the judgment circuit 120. The calculation circuit 180 generates a second reference value VR2 based on a first reference value VR1 and a set value VSET, and provides the second reference value VR2 to the judgment circuit 120. It is worth mentioning that the calculation circuit 180 generates the second reference value VR2 based on the first reference value VR1 and the set value VSET. Therefore, the separate circuit for generating the second reference value VR2 can be omitted. Therefore, the circuit cost of the headphone device 100 can be reduced. In this embodiment, the calculation circuit 180 can be a subtractor circuit (the invention is not limited thereto). For example, the calculation circuit 180 subtracts the voltage value of the set value VSET from the voltage value of the first reference value VR1 to generate the second reference value VR2.

[0039] Please also refer to Figure 1 , Figure 4 as well as Figure 5 , Figure 5 It is based on Figure 4The illustrated circuit diagram shows the headphone device. In this embodiment, the sensing circuit 110 includes a force-resistance sensor 111. The distance between the two ends of the headband HB is negatively correlated with the resistance value of the force-resistance sensor 111. When the headband HB is pulled open, the force-resistance sensor 111 provides a first resistance value. When the headband HB is closed, the force-resistance sensor 111 provides a second resistance value. The second resistance value is greater than the first resistance value. The sensing circuit 110 provides a first sensed value based on the first resistance value and a second sensed value based on the second resistance value. That is, the resistance value of the force-resistance sensor 111 is negatively correlated with the sensed value SS. Therefore, the magnitude of the distance between the two ends of the headband HB is positively correlated with the sensed value SS.

[0040] In this embodiment, the sensing circuit 110 further includes resistors R1, R2, and R3. A force-resistance sensor 111 is coupled between a reference high voltage VS and the first terminal of resistor R1. The second terminal of resistor R1 is coupled to a reference low voltage (e.g., ground). Resistor R2 is coupled between the first terminal of resistor R1 and amplifier circuit 140. Resistor R2 is also coupled between amplifier circuit 140 and the reference low voltage. The sensing circuit 110 can generate a sensed value SS by utilizing the voltage division of the reference high voltage VS by the force-resistance sensor 111 and resistors R1, R2, and R3. The second resistance value is greater than the first resistance value. Therefore, the second sensed value is less than the first sensed value.

[0041] In this embodiment, the amplifier circuit 140 includes an operational amplifier OPA1 and resistors R4 and R5. The non-inverting input of the amplifier circuit 140 is coupled to the sensing circuit 110. Resistor R4 is coupled between the inverting input of the amplifier circuit 140 and a reference low voltage. Resistor R5 is coupled between the inverting input of the amplifier circuit 140 and the output of the amplifier circuit 140. In this embodiment, the amplifier circuit 140 can increase the voltage value of the sensed value SS based on the resistance values ​​of resistors R4 and R5.

[0042] In this embodiment, the judgment circuit 120 includes a first comparator CP1 and a second comparator CP2. The non-inverting input of the first comparator CP1 receives the sensed value SS. The inverting input of the first comparator CP1 receives a first reference value VR1. The output of the first comparator CP1 outputs a first judgment signal VO1. The non-inverting input of the second comparator CP2 receives a second reference value VR2. The inverting input of the second comparator CP2 receives the sensed value SS. The output of the second comparator CP2 outputs a second judgment signal VO2.

[0043] Reference circuit 150 is coupled to the inverting input of comparator CP1. In this embodiment, reference circuit 150 includes transistor Q1 and resistors R6, R7, and R8. The first terminal of resistor R6 receives a reference high voltage VS. The first terminal of transistor Q1 is coupled to the second terminal of the first reference resistor. The second terminal of transistor Q1 is coupled to the inverting input of comparator CP1. The control terminal of transistor Q1 receives a switching signal SSW1. Resistor R7 is coupled between the second terminal of transistor Q1 and the reference low voltage. Resistor R8 is coupled between the control terminal of transistor Q1 and the reference low voltage.

[0044] A switching circuit 170 is coupled between the inverting input of the first comparator CP1 and the reference circuit 160. The switching circuit 170 includes transistors Q2 and Q3. Transistors Q2 and Q3 are connected in series between the inverting input of the first comparator CP1 and the second reference circuit 160. The first terminal of transistor Q2 is coupled to the inverting input of the first comparator CP1. The second terminal of transistor Q2 is coupled to the first terminal of transistor Q3. The second terminal of transistor Q3 is coupled to the second reference circuit 160. A switching signal SSW2 is provided for the control terminals of transistors Q2 and Q3.

[0045] In this embodiment, when headphones E1 and E2 are in the off state, switch signal SSW1 has a low voltage level, and switch signal SSW2 has a high voltage level. Therefore, transistor Q1 is turned on, and transistors Q2 and Q3 are turned off. The first reference circuit 150 generates a first reference value VR1 and provides the first reference value VR1 to the inverting input of the first comparator CP1. During the period when the first reference circuit 150 provides the first reference value VR1, the switch circuit 170 disconnects the connection between the second reference circuit 160 and the inverting input of the first comparator CP1.

[0046] When the headband HB is pulled open, the force-resistance sensor 111 provides a first resistance value. The first judgment signal VO1 output by the first comparator CP1 has a rising edge. Therefore, the microcontroller 130 is woken up. The woken-up microcontroller 130 controls the reference circuit 160 to provide a first reference value VR1. At this time, the switching signal SSW1 has a high voltage level. The switching signal SSW2 has a low voltage level. Therefore, transistor Q1 is turned off, and transistors Q2 and Q3 are turned on. The first reference circuit 150 stops providing the first reference value VR1. During the period when the first reference circuit 150 stops providing the first reference value VR1, the switching circuit 170 connects the second reference circuit 160 to the inverting input of the first comparator CP1.

[0047] In this embodiment, the arithmetic circuit 180 is coupled between the inverting input of the first comparator CP1 and the non-inverting input of the second comparator CP2. The arithmetic circuit 180 generates a second reference value VR2 based on the first reference value VR1 and the set value VSET, and provides the second reference value VR2 to the non-inverting input of the second comparator CP2.

[0048] In this embodiment, the operational circuit 180 includes a setpoint generator 181 and an operational amplifier OPA2. The setpoint generator 181 provides a setpoint VSET. The operational amplifier OPA2 is coupled to the setpoint generator 181 and the non-inverting input of the second comparator CP2. The operational amplifier OPA2 receives a first reference value VR1 and the setpoint VSET, and generates a second reference value VR2 based on the first reference value VR1 and the setpoint VSET.

[0049] The setpoint generator 181 includes an operational amplifier OPA3 and resistors R8 and R9. Resistor R8 is coupled between a reference high voltage VS and the non-inverting input of operational amplifier OPA3. Resistor R9 is coupled between the non-inverting input of operational amplifier OPA3 and the reference low voltage. The inverting input of operational amplifier OPA3 is coupled to the output of operational amplifier OPA3. The setpoint generator 181 divides the reference high voltage VS based on the resistance values ​​of resistors R8 and R9 to provide a setpoint VSET. The setpoint VSET is a voltage value.

[0050] The operational circuit 180 also includes resistors R10, R11, R12, and R13. Resistor R10 is coupled between the inverting input of the first comparator CP1 and the non-inverting input of the operational amplifier OPA3. Resistor R11 is coupled between the non-inverting input of the operational amplifier OPA3 and a reference low voltage. Resistor R12 is coupled between the inverting input of the operational amplifier OPA3 and the setpoint generator 181. Resistor R13 is coupled between the inverting input of the operational amplifier OPA3 and its output. In this embodiment, resistors R10, R11, R12, and R13 may have approximately the same resistance value. The operational amplifier OPA2 and resistors R10, R11, R12, and R13 can together form a subtractor circuit. Therefore, the operational circuit 180 subtracts the setpoint VSET from the first reference value VR1 to generate a second reference value VR2. In other words, the second reference value VR2 is the voltage difference between the first reference value VR1 and the set value VSET. The second reference value VR2 is less than the first reference value VR1.

[0051] The following example illustrates the operation of the headphone device 100. Please also refer to... Figure 1 , Figure 5 as well as Figure 6, Figure 6 This is a first operational schematic diagram of a judgment circuit according to an embodiment of the present invention. In this embodiment, when the headphone device 100 is worn, the second reference circuit 160 provides a first reference value VR1. The first reference value VR1 is, for example, 1.08 volts (V). The set value VSET is, for example, 0.16V. Therefore, the second reference value VR2 is, for example, 0.92V (i.e., 1.08V - 0.16V = 0.92V). When the headphone device 100 is worn, the sensed value SS is, for example, 1V. The sensed value SS is less than the first reference value VR1. Therefore, the first judgment signal VO1 output by the first comparator CP1 has a low voltage level. The sensed value SS is greater than the second reference value VR2. Therefore, the second judgment signal VO2 output by the second comparator CP2 also has a low voltage level. When the headphone device 100 is worn, the microcontroller 130 continuously enters a sleep state based on the first judgment signal VO1 and the second judgment signal VO2, which have low voltage levels.

[0052] Please also refer to Figure 1 , Figure 5 as well as Figure 7 , Figure 7 This is a second operational schematic diagram of the judgment circuit according to an embodiment of the present invention. When the headband HB is pulled open while worn, the resistance value of the force-resistance sensor 111 decreases. Therefore, the sensed value SS rises, for example, from 1V to 1.2V. The sensed value SS is greater than the first reference value VR1. Therefore, the first judgment signal VO1 output by the first comparator CP1 rises from a low voltage level to a high voltage level. When the headband HB is pulled open while worn, the first judgment signal VO1 has a rising edge. The sensed value SS is greater than the second reference value VR2. Therefore, the second judgment signal VO2 output by the second comparator CP2 also has a low voltage level. The microcontroller 130 is woken up according to the rising edge of the first judgment signal VO1 and recognizes that the headband HB has been pulled open.

[0053] Please also refer to Figure 1 , Figure 5 as well as Figure 8 , Figure 8This is a third operational schematic diagram of the judgment circuit according to an embodiment of the present invention. When the headband HB is retracted (e.g., the headphone device 100 is removed), the resistance value of the force-resistance sensor 111 increases. Therefore, the sensed value SS drops, for example, to 0.8V. The sensed value SS is less than the first reference value VR1. Therefore, the first judgment signal VO1 output by the first comparator CP1 has a low voltage level. The sensed value SS is less than the second reference value VR2. Therefore, the second judgment signal VO2 output by the second comparator CP2 rises from the low voltage level to the high voltage level. When the headband HB is retracted, the second judgment signal VO2 has a rising edge. The microcontroller 130 is woken up according to the rising edge of the second judgment signal VO2 and recognizes that the headband HB is retracted.

[0054] In summary, the sensing circuit of the headphone device is located on the headband. The sensing circuit provides a sensed value corresponding to the stretching change of the headband. The headphone device controls the state of the headphones based on this sensed value. The sensing circuit is located on the headband, making its assembly relatively simple. This also reduces the assembly cost of the headphone device. Furthermore, the headphone device controls its state based on the sensed value corresponding to the stretching change of the headband. The sensed value is not susceptible to interference from external metal or electrodes, thus preventing erroneous operation. This allows the headphone device to achieve high judgment accuracy. Moreover, the headphone device's microcontroller is only awakened by a change in the level of either a first judgment signal or a second judgment signal. After controlling the headphones, the microcontroller goes into sleep mode. Therefore, through intermittent sleep mode, low power consumption during wear is ensured.

[0055] It should be noted that those skilled in the art, upon considering the specification and practicing the application disclosed herein, will readily conceive of other embodiments of this application. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0056] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A headphone device, characterized in that, The earphone device includes: Head beam; The headphones are attached to the end of the headband; A sensing circuit is disposed on the headband and configured to provide a sensed value corresponding to the stretching change of the headband. A judgment circuit, coupled to the sensing circuit, is configured to compare the sensed value with a first reference value to generate a first judgment signal, and to compare the sensed value with a second reference value to generate a second judgment signal; and... A microcontroller, coupled to the judgment circuit, is configured to control the earphone to enter either a power-on state or a power-off state based on the first judgment signal and the second judgment signal; After the headphones are controlled to enter either the power-on state or the power-off state, the microcontroller enters a sleep state; and, The microcontroller is activated by either a change in the level of the first judgment signal or a change in the level of the second judgment signal. The determination circuit includes: A first comparator, wherein the non-inverting input of the first comparator receives the sensed value, the inverting input of the first comparator receives the first reference value, and the output of the first comparator outputs the first judgment signal; and The second comparator receives the second reference value at its non-inverting input terminal, receives the sensed value at its inverting input terminal, and outputs the second judgment signal at its output terminal. The microcontroller is woken up when it is triggered by either the rising edge of the first judgment signal or the rising edge of the second judgment signal.

2. The earphone device according to claim 1, characterized in that: When the headband is pulled open, the sensing circuit provides a first sense value; When the headband is retracted, the sensing circuit provides a second sensed value; and, The microcontroller controls the earphone to enter the power-on state based on the first judgment signal.

3. The earphone device according to claim 2, characterized in that, The microcontroller times the duration of the second sensed value. When the duration reaches the set time, the microcontroller controls the earphone to enter the power-off state.

4. The earphone device according to claim 2, characterized in that, The sensing circuit includes: A force-resistance sensor is configured to provide a first resistance value when the headband is pulled open and a second resistance value when the headband is retracted.

5. The earphone device according to claim 4, characterized in that: The second resistance value is greater than the first resistance value; The sensing circuit provides the first sensed value based on the first resistance value, and provides the second sensed value based on the second resistance value; and, The second sensed value is less than the first sensed value.

6. The earphone device according to claim 1, characterized in that, Also includes: An amplifier circuit, coupled to the sensing circuit and the determination circuit, is configured to amplify the sensed value.

7. The earphone device according to claim 1, characterized in that, The microcontroller identifies that the headband is pulled outward based on the rising edge of the first judgment signal, and identifies that the headband is retracted based on the rising edge of the second judgment signal.

8. The earphone device according to claim 1, characterized in that, Also includes: A first reference circuit is coupled to the inverting input of the first comparator and configured to provide the first reference value in the power-off state and to stop providing the first reference value in the power-on state. A second reference circuit, coupled to the microcontroller, is configured to provide the first reference value in the power-on state; as well as, A switching circuit is configured to connect the second reference circuit to the inverting input of the first comparator during the period when the first reference circuit stops providing the first reference value, and to disconnect the connection between the second reference circuit and the inverting input of the first comparator during the period when the first reference circuit provides the first reference value.

9. The earphone device according to claim 1, characterized in that, Also includes: An operational circuit, coupled between the inverting input of the first comparator and the non-inverting input of the second comparator, is configured to generate the second reference value based on the first reference value and a set value, and to provide the second reference value to the non-inverting input of the second comparator.

10. The earphone device according to claim 9, characterized in that, The arithmetic circuit includes: A setpoint generator, configured to provide the setpoint; and, An operational amplifier, coupled to the setpoint generator and the non-inverting input of the second comparator, is configured to generate the second reference value based on the first reference value and the setpoint.

11. A control method for an earphone device, characterized in that, The headphone device includes a headband, headphones, a sensing circuit, a judgment circuit, and a microcontroller. The headphones are attached to the end of the headband. The control method includes: The sensing circuit provides a sensed value corresponding to the stretching change of the headband based on the stretching change of the headband. The determination circuit compares the sensed value with a first reference value to generate a first determination signal, and compares the sensed value with a second reference value to generate a second determination signal; and, The microcontroller controls the earphone to enter either a power-on state or a power-off state based on the first judgment signal and the second judgment signal; After controlling the headphones to enter either the power-on state or the power-off state, the microcontroller is put into a sleep state; and, The microcontroller is triggered based on either a change in the level of the first judgment signal or a change in the level of the second judgment signal, thereby waking up the microcontroller. The judgment circuit includes a first comparator and a second comparator. The non-inverting input of the first comparator receives the sensed value, the inverting input of the first comparator receives the first reference value, and the output of the first comparator outputs the first judgment signal. The non-inverting input of the second comparator receives the second reference value, the inverting input of the second comparator receives the sensed value, and the output of the second comparator outputs the second judgment signal. The step of triggering the microcontroller based on one of the changes in the level of the first judgment signal and the changes in the level of the second judgment signal includes: The microcontroller is triggered based on either the rising edge of the first judgment signal or the rising edge of the second judgment signal.

12. The control method according to claim 11, characterized in that, The step of providing the sensed value corresponding to the stretching change of the headband by the sensing circuit includes: When the headband is pulled open, a first sensing value is provided; and, A second sensing value is provided when the headband is retracted.

13. The control method according to claim 12, characterized in that, The step of providing the sensed value corresponding to the stretching change of the headband by the sensing circuit includes: When the headband is pulled apart, it provides a first resistance value; When the headband is retracted, a second resistance value is provided, wherein the second resistance value is greater than the first resistance value; and The sensing circuit provides the first sensing value based on the first resistance value and provides the second sensing value based on the second resistance value, wherein the second sensing value is less than the first sensing value.

14. The control method according to claim 12, characterized in that, The control method further includes: The microcontroller times the duration of the second sensed value. When the duration reaches the set time, the microcontroller controls the earphone to enter the power-off state.

15. The control method according to claim 11, characterized in that, Also includes: The second reference value is generated based on the first reference value and the set value.

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