CN104380697B - A kind of terminal and system for reducing noise during headset plugging - Google Patents

Abstract

Embodiments of the present invention provide a terminal and system capable of reducing noise during earphone plugging and unplugging. The terminal includes: an earphone base, a switch circuit, an earphone power supply circuit, a voltage divider circuit, the first pin of the earphone base is connected to the control pin of the switch circuit, and the second pin of the earphone base is connected to the switch The input end of the circuit is connected, the first output end of the switch circuit is connected with the earphone power supply circuit, and the second output end of the switch circuit is connected with the voltage divider circuit; wherein, when the control pin of the switch circuit When the input voltage of the switch circuit is higher than the second preset voltage value, the control pin of the switch circuit controls the input terminal of the switch circuit to communicate with the second output terminal of the switch circuit. In the embodiment of the present invention, a switch circuit is added to the terminal. When the input voltage of the control pin of the switch circuit is higher than the second preset voltage value, the earphone power supply circuit is disconnected from the second pin of the earphone socket, so the earphone power supply The voltage on the circuit will not form a loop on the left or right channel of the earphone, thereby effectively reducing the noise generated when the earphone is inserted or pulled out of the earphone socket.

Description

A terminal and system capable of reducing noise during earphone plugging and unplugging

technical field

Embodiments of the present invention relate to communication technologies, and in particular to a terminal and a system capable of reducing noise during earphone plugging and unplugging.

Background technique

With the development of electronic technology, the functions of electronic products are becoming more and more powerful, and the use of electronic products is becoming more and more frequent. The use of electronic products to play video files and audio files is also becoming more and more frequent. Therefore, the use of headphones more and more. When the earphone is inserted into the earphone socket or the earphone is pulled out of the earphone socket, noise will be emitted from the left or right channel of the earphone.

The following takes the earphone being inserted or pulled out of the earphone socket to the position shown in Figure 1 as an example to illustrate the reason for the noise generated during the process of the earphone being inserted or pulled out of the earphone socket. As shown in Figure 1, the pin 2 of the earphone base contacts the G segment of the earphone, and the pin 3 of the earphone base contacts the R segment of the earphone. In this way, the voltage on the microphone bias voltage MIC_BIAS will form a loop on the right channel of the earphone, and then noise will be transmitted from the right channel of the earphone.

Especially the active noise canceling earphones powered by the 3.5mm headphone port on the motherboard side of the mobile phone will generate more noise when the earphones are inserted or pulled out of the earphone socket, because this kind of active noise canceling earphones need to pass through the earphone socket. Pin 2 supplies power. The higher the power supply voltage, the greater the noise generated when the earphone is inserted or pulled out of the earphone socket. Frequent noise will affect the user's hearing. Therefore, how to reduce the earphone plugging and unplugging process? Noise will be a burning issue.

Contents of the invention

Embodiments of the present invention provide a terminal and a system capable of reducing noise during earphone plugging and unplugging, so as to reduce the problem of noise during earphone plugging and unplugging.

In the first aspect, an embodiment of the present invention provides a terminal that can reduce noise during earphone plugging and unplugging, including: an earphone socket, a switch circuit, an earphone power supply circuit, and a voltage divider circuit. The earphone socket includes a first pin and a second pin. Pin, the switch circuit includes a control pin, an input end, a first output end and a second output end, the first pin of the earphone base is connected with the control pin of the switch circuit, the second pin of the earphone base The pin is connected to the input end of the switch circuit, the first output end of the switch circuit is connected to the earphone power supply circuit, and the second output end of the switch circuit is connected to the voltage divider circuit; the voltage divider The circuit is used to reduce the voltage difference passing through the left channel or the right channel of the earphone, and the terminal determines that the earphone is plugged in or pulled out by detecting the voltage of the first pin, and the terminal determines through the The second pin supplies power to the earphone; wherein, when the input voltage of the control pin of the switch circuit is lower than the first preset voltage value, the control pin of the switch circuit controls the input terminal of the switch circuit to connect with the The first output terminal of the switch circuit is connected; when the input voltage of the control pin of the switch circuit is higher than the second preset voltage value, the control pin of the switch circuit controls the input terminal of the switch circuit and the switch The second output terminal of the circuit is connected.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the terminal further includes: a voltage adjustment unit, the first pin of the earphone socket is connected to the control pin of the switch circuit, specifically the The first pin of the earphone base is connected to one end of the voltage adjustment unit, the other end of the voltage adjustment unit is connected to the control pin of the switch circuit, and the voltage adjustment unit is used to The voltage of the first pin adjusts the input voltage of the control pin of the switch circuit to be lower than the first preset voltage value; or, adjusts the input of the control pin of the switch circuit according to the voltage of the first pin of the earphone socket The voltage is higher than the second preset voltage value.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the voltage adjustment unit is specifically a voltage comparator, and the voltage comparator is configured to The voltage of the first pin of the socket and the reference voltage adjust the input voltage of the control pin of the switch circuit to be lower than the first preset voltage value; or, according to the voltage of the first pin of the earphone socket and the reference voltage, adjust the The input voltage of the control pin of the switch circuit is higher than the second preset voltage value.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the terminal further includes: a CPU, the first pin of the earphone socket is connected to the control pin of the switch circuit, specifically the earphone The first pin of the socket is electrically connected to the CPU, the CPU is electrically connected to the control pin of the switch circuit, and the CPU is used to adjust the switch circuit according to the voltage of the first pin of the earphone socket The input voltage of the control pin of the switch circuit is adjusted to be higher than the second preset voltage value according to the voltage of the first pin of the earphone socket.

In combination with the first aspect and any of the above possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, it includes: the voltage dividing circuit includes a pull-down resistor, and one end of the pull-down resistor is connected to The second output end of the switch circuit is connected, and the other end of the pull-down resistor is connected to the ground of the terminal; or, the other end of the pull-down resistor is connected to the earphone power supply circuit.

With reference to the fourth possible implementation of the first aspect, in the fifth possible implementation of the first aspect, when the other end of the pull-down resistor is connected to the ground of the terminal, the resistance of the pull-down resistor Values less than or equal to 1K ohms.

With reference to the fourth possible implementation of the first aspect, in the sixth possible implementation of the first aspect, when the other end of the pull-down resistor is connected to the earphone power supply circuit, the resistance of the pull-down resistor The value is greater than or equal to 5K ohms.

In combination with the first aspect and any of the above possible implementation manners of the first aspect, in the seventh possible implementation manner of the first aspect, the setting of the earphone socket needs to meet the following conditions: the earphone is fully inserted into the After the earphone socket, the contact of the second pin of the earphone socket reliably touches the earphone; and, when the earphone is inserted into the earphone socket, when the first pin of the earphone socket When just in contact with the earphone, the contact of the second pin of the earphone base does not contact with the conductive segment of the earphone.

In the second aspect, an embodiment of the present invention provides a terminal that can reduce noise during earphone plugging and unplugging, including: an earphone socket, a switch circuit, an earphone power supply circuit, and a voltage divider circuit. The earphone socket includes a first pin and a second pin. Pin, the switch circuit includes a control pin, an input end, a first output end and a second output end, the first pin of the earphone base is connected with the control pin of the switch circuit, the second pin of the earphone base The pin is connected to the input end of the switch circuit, the first output end of the switch circuit is connected to the earphone power supply circuit, and the second output end of the switch circuit is connected to the voltage divider circuit; the voltage divider The circuit is used to reduce the voltage difference passing through the left channel or the right channel of the earphone, and the terminal determines that the earphone is plugged in or pulled out by detecting the voltage of the first pin, and the terminal determines through the The second pin supplies power to the earphone; wherein, when the input voltage of the control pin of the switch circuit is higher than the first preset voltage value, the control pin of the switch circuit controls the input terminal of the switch circuit to connect with the The first output terminal of the switch circuit is connected; when the input voltage of the control pin of the switch circuit is lower than the second preset voltage value, the control pin of the switch circuit controls the input terminal of the switch circuit and the switch The second output terminal of the circuit is connected.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the terminal further includes: a voltage adjustment unit, the first pin of the earphone socket is connected to the control pin of the switch circuit, specifically the The first pin of the earphone base is connected to one end of the voltage adjustment unit, the other end of the voltage adjustment unit is connected to the control pin of the switch circuit, and the voltage adjustment unit is used to The voltage of the first pin adjusts the input voltage of the control pin of the switch circuit to be lower than the first preset voltage value; or, adjusts the input of the control pin of the switch circuit according to the voltage of the first pin of the earphone socket The voltage is higher than the second preset voltage value.

With reference to the second possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the voltage adjustment unit is specifically a voltage comparator, and the voltage comparator is configured to The voltage of the first pin of the socket and the reference voltage adjust the input voltage of the control pin of the switch circuit to be lower than the first preset voltage value; or, according to the voltage of the first pin of the earphone socket and the reference voltage, adjust the The input voltage of the control pin of the switch circuit is higher than the second preset voltage value.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the terminal further includes: a CPU, the first pin of the earphone socket is connected to the control pin of the switch circuit, specifically the earphone The first pin of the socket is electrically connected to the CPU, the CPU is electrically connected to the control pin of the switch circuit, and the CPU is used to adjust the switch circuit according to the voltage of the first pin of the earphone socket The input voltage of the control pin of the switch circuit is adjusted to be higher than the second preset voltage value according to the voltage of the first pin of the earphone socket.

In combination with the second aspect and any of the above-mentioned possible implementation manners of the second aspect, in a fourth possible implementation manner of the second aspect, it includes: the voltage dividing circuit includes a pull-down resistor, and one end of the pull-down resistor is connected to The second output end of the switch circuit is connected, and the other end of the pull-down resistor is connected to the ground of the terminal; or, the other end of the pull-down resistor is connected to the earphone power supply circuit.

With reference to the fourth possible implementation of the second aspect, in the fifth possible implementation of the second aspect, when the other end of the pull-down resistor is connected to the ground of the terminal, the resistance of the pull-down resistor Values less than or equal to 1K ohms.

With reference to the fourth possible implementation of the second aspect, in the sixth possible implementation of the second aspect, when the other end of the pull-down resistor is connected to the earphone power supply circuit, the resistance of the pull-down resistor The value is greater than or equal to 5K ohms.

In combination with the second aspect and any of the above possible implementation manners of the second aspect, in the seventh possible implementation manner of the second aspect, the setting of the earphone socket needs to meet the following conditions: the earphone is fully inserted into the After the earphone socket, the contact of the second pin of the earphone socket reliably touches the earphone; and, when the earphone is inserted into the earphone socket, when the first pin of the earphone socket and When the earphone is just in contact, the contact of the second pin of the earphone base does not contact with the conductive segment of the earphone.

In the third aspect, the embodiment of the present invention also provides a system that can reduce noise when earphones are plugged and unplugged, including: the first aspect and the terminal and earphones described in any one of the implementations of the first aspect; or, the second The terminal and the headset described in any one of the implementation manners of the aspect and the second aspect.

With reference to the third aspect, the first possible implementation of the third aspect includes: when the line sequence of the earphone is L, R, G, M, the length of the G section of the earphone is W mm; Or, when the line sequence of the earphone is L, R, M, G, the length of the M segment of the earphone is W mm; the setting of the earphone needs to meet the following conditions: the earphone is completely inserted into the After the earphone socket, the contact of the second pin of the earphone socket reliably touches the earphone; and, when the earphone is inserted into the earphone socket, when the first pin of the earphone socket contacts the earphone When the earphone is just in contact, the contact of the second pin of the earphone socket does not contact the conductive segment of the earphone.

The embodiment of the present invention provides a terminal and system that can reduce noise during earphone plugging and unplugging. By adding a switch circuit to the terminal, when the input voltage of the control pin of the switch circuit is high or low (for The type of earphone used in conjunction with the terminal, select one of high level or low level), the input end of the switch circuit is connected with the second output end of the switch circuit, that is, the earphone power supply circuit and the first earphone socket The two pins are disconnected, so the voltage on the earphone power supply circuit will not form a loop on the left or right channel of the earphone, and there will be no noise from the left or right channel of the earphone, thus effectively It greatly reduces the noise generated when the earphone is inserted or pulled out of the earphone socket.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a terminal in the prior art;

FIG. 2 is a schematic diagram of a terminal structure provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a terminal provided by another embodiment of the present invention;

4 is a schematic structural diagram of a voltage divider circuit and a switch circuit provided by an embodiment of the present invention;

5 is a schematic structural diagram of a voltage divider circuit and a switch circuit provided by another embodiment of the present invention;

FIG. 6 is a system structure diagram provided by an embodiment of the present invention;

Fig. 7 is a structural schematic diagram of a standard earphone in the prior art;

Fig. 8 is a schematic structural diagram of an improved earphone provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiment one

FIG. 2 is a schematic structural diagram of a terminal provided by an embodiment of the present invention (only the parts related to the earphone holder are shown). As shown in Figure 2, the terminal includes: an earphone socket 21, a switch circuit 22, an earphone power supply circuit 23, a voltage divider circuit 24, the earphone socket 21 includes a first pin 1 and a second pin 2, and the switch circuit 22 includes a control pin 223, an input end 220, a first output end 221 and a second output end 222, the first pin 1 of the earphone socket 21 is connected to the control pin 223 of the switch circuit 22, and the earphone socket 21 The second pin 2 of the switch circuit 22 is connected to the input terminal 220, the first output terminal 221 of the switch circuit 22 is connected to the earphone power supply circuit 23, and the second output terminal 222 of the switch circuit 22 is connected to the The voltage divider circuit 24 is connected, and the voltage divider circuit is used to reduce the voltage difference passing through the left channel or the right channel of the earphone, and the terminal determines that the earphone is switched by detecting the voltage of the first pin. Plugged in or pulled out, the terminal supplies power to the earphone through the second pin 2 .

It should be noted that the terminal supplies power to or charges the earphone through the earphone power supply circuit 23. For example, if the earphone is an ordinary earphone, the earphone power supply circuit 23 may be a circuit that supplies power to the microphone of the earphone; Noise-type earphones, the earphone power supply circuit 23 may be a circuit for powering or charging the earphones.

There are two designs of earphone holders on the market. The first type: before the earphone is inserted into the earphone base, the first pin 1 of the earphone base 21 is not in contact with the segment L; after the earphone is inserted into the earphone base, the first pin 1 of the earphone base 21 is in contact with the segment L; the second type : Before the earphone is inserted into the earphone base, the first pin 1 of the earphone base 21 is in contact with segment L; One pin 1 pops open.

For the first earphone socket, when the input voltage of the control pin 223 of the switch circuit 22 is lower than the first preset voltage value (the input voltage of the control pin 223 of the switch circuit 22 is low level), the The input end 220 of the switch circuit 22 is communicated with the first output end 221 of the switch circuit 22; when the input voltage of the control pin 223 of the switch circuit 22 is higher than the second preset voltage value (the control of the switch circuit 22 When the input voltage of pin 223 is high level), the input end 220 of the switch circuit 22 is connected with the second output end 222 of the switch circuit 22 .

For the second earphone socket, when the input voltage of the control pin 223 of the switch circuit 22 is higher than the first preset voltage value (the input voltage of the control pin 223 of the switch circuit 22 is high level), the The input end 220 of the switch circuit 22 is communicated with the first output end 221 of the switch circuit 22; when the input voltage of the control pin 223 of the switch circuit 22 is lower than the second preset voltage value (the control of the switch circuit 22 When the input voltage of pin 223 is low level), the input end 220 of the switch circuit 22 is connected with the second output end 222 of the switch circuit 22 .

Wherein, the first preset voltage value and the second preset voltage value are preset voltage values, and the values of the first preset voltage value and the second preset voltage value can be set according to actual needs, and the embodiment of the present invention does not Specific limits.

It should be noted that, when the earphone is inserted into the earphone socket or the earphone is pulled out of the earphone socket, the voltage of the first pin 1 of the earphone socket 21 will change. Generally, when the first pin 1 of the earphone base 21 is in contact with the earphone, the voltage of the first pin 1 of the earphone base 21 is at a low level, so that the voltage input to the switch circuit 22 is low. The input voltage of the control pin 223 is also low level; when the first pin 1 of the earphone base 21 is not in contact with the earphone, the voltage of the first pin 1 of the earphone base 21 is high level, The input voltage of the control pin 223 of the switch circuit 22 is also high level.

For the first type of earphone holder, when the earphone is inserted into or pulled out of the earphone holder 21, when the first pin 1 of the earphone holder 21 is not connected to the L segment of the earphone, the voltage of the first pin 1 is high Level, the input terminal 220 of the switch circuit 22 is connected with the second output terminal 222 of the switch circuit 22, that is, the earphone power supply circuit 23 is disconnected from the second pin 2 of the earphone socket 21, so the voltage on the earphone power supply circuit 23 will not A loop is formed on the left or right channel of the earphone, so that no noise will be emitted from the left or right channel of the earphone.

For the second type of earphone socket, when the earphone is inserted into or pulled out of the earphone socket 21, and the first pin 1 of the earphone socket 21 is not popped up, the voltage of the first pin 1 is low. The input terminal 220 of the switch circuit 22 is connected with the second output terminal 222 of the switch circuit 22, that is, the earphone power supply circuit 23 is disconnected from the second pin 2 of the earphone socket 21, so the voltage on the earphone power supply circuit 23 will not be in the earphone. A loop is formed on the left or right channel, and no noise will be emitted from the left or right channel of the earphone.

The embodiment of the present invention provides a terminal that can reduce noise during earphone plugging and unplugging. By adding a switch circuit to the terminal, when the input voltage of the control pin of the switch circuit is high or low (for the The type of earphone used in conjunction with one of high level or low level), the input end of the switch circuit is connected with the second output end of the switch circuit, that is, the earphone power supply circuit and the second lead of the earphone socket The pin is disconnected, so the voltage on the earphone power supply circuit will not form a loop on the left or right channel of the earphone, and there will be no noise from the left or right channel of the earphone, thereby effectively reducing The noise generated when the earphone is inserted or unplugged from the earphone socket is eliminated.

When the earphone is inserted into the earphone socket or the earphone is pulled out of the earphone socket, the voltage of the first pin 1 of the earphone socket 21 will change. Generally, when the first pin 1 of the earphone base 21 is in contact with the earphone, the voltage of the first pin 1 of the earphone base 21 is at a low level, and when the first pin 1 of the earphone base 21 When the pin 1 is not in contact with the earphone, the voltage of the first pin 1 of the earphone holder 21 is at a high level, but sometimes the voltage change of the first pin 1 is not very obvious, thus causing the The switch circuit cannot accurately determine whether the first pin 1 of the earphone socket 21 is in contact with the earphone, which may lead to wrong use of the switch circuit 22 . For this situation, the following methods can be used to solve it.

Optionally, software can be used to solve the problem that the switch circuit cannot accurately determine whether the first pin 1 of the earphone socket 21 is in contact with the earphone. The terminal also includes: a CPU (not shown in the figure), the first pin of the earphone base is connected to the control pin of the switch circuit, specifically the CPU, and the first pin of the earphone base 21 1 is electrically connected to the control pin of the switch circuit 22, and the CPU is used to adjust the input voltage of the control pin of the switch circuit according to the voltage value of the first pin 1 of the earphone socket 21 to be lower than The first preset voltage value; or, adjust the input voltage of the control pin of the switch circuit to be higher than the second preset voltage value according to the voltage of the first pin 1 of the earphone socket 21 .

By electrically connecting the first pin 1 of the earphone socket 21 and the control pin 223 of the switch circuit 22 to the CPU, the CPU adjusts the voltage value according to the voltage value of the first pin 1 of the earphone socket 21. The input voltage of the control pin 223 of the switch circuit 22 is lower than the first preset voltage value; or, the input voltage of the control pin 223 of the switch circuit 22 is adjusted according to the voltage of the first pin 1 of the earphone socket 21 Higher than the second preset voltage value, that is, the CPU adjusts the voltage obtained from the first pin 1 of the earphone socket 21 to the control pin 223 of the switch circuit 22 to accurately identify high level or low voltage. flat voltage. The specific adjustment can refer to the first preset voltage value and the second preset voltage value. Therefore, there is no need to add hardware, and software is used to control the connection and disconnection of the earphone power supply circuit 23 and the second pin 2 of the earphone socket 21, which can still effectively reduce the number of earphones being inserted or blocked without increasing the manufacturing cost of the terminal. Noise generated during the process of pulling out the earphone socket 21.

Optionally, hardware can be used to solve the problem that the switch circuit cannot accurately determine whether the first pin 1 of the earphone socket 21 is in contact with the earphone. The terminal also includes: a voltage adjustment unit (not shown in the figure), the first pin 1 of the earphone base 21 is connected to the control pin 23 of the switch circuit 22, specifically the first pin 1 of the earphone base 21 Pin 1 is connected to one end of the voltage adjustment unit, and the other end of the voltage adjustment unit is connected to the control pin 223 of the switch circuit 22 . The voltage adjustment unit is used to adjust the input voltage of the control pin 223 of the switch circuit 22 to be lower than the first preset voltage value according to the voltage of the first pin 1 of the earphone socket 21; or, according to the voltage of the earphone socket 21 The voltage of the first pin 1 of the socket 211 adjusts the input voltage of the control pin 223 of the switch circuit 22 to be higher than the second preset voltage value.

FIG. 3 is a schematic structural diagram of a terminal provided by an embodiment of the present invention (only the part related to the earphone socket 21 is shown). This embodiment can be implemented based on the embodiment shown in FIG. 2 , and only the parts different from those in FIG. 2 are described here. For the same parts, refer to the description of FIG. 2 .

Optionally, the voltage adjustment unit is specifically a voltage comparator 31, and the first pin 1 of the earphone socket 21 is connected to the control pin 223 of the switch circuit 22, specifically (as shown in FIG. 3 ): the The first pin 1 of the earphone socket 21 is connected to the first terminal of the voltage comparator 31, the second terminal of the voltage comparator 31 is connected to the reference voltage V, and the third terminal of the voltage comparator 31 is connected to the voltage comparator 31. The control pin 223 of the switch circuit 22 is connected, and the voltage comparator 31 is used to adjust the input voltage of the control pin 223 of the switch circuit 22 according to the voltage of the first pin 1 of the earphone socket 21 and the reference voltage V. or adjust the input voltage of the control pin 223 of the switch circuit 22 to be higher than the second preset voltage value according to the voltage of the first pin 1 of the earphone socket 21 and the reference voltage V. The voltage comparator 31 compares the voltage obtained from the first pin 1 of the earphone socket 21 with the reference voltage V, and adjusts the voltage to be output by the voltage comparator 31 to the control of the switch circuit 22 Pin 223 can accurately identify high-level or low-level voltage. The specific adjustment can refer to the first preset voltage value and the second preset voltage value.

By adjusting the output voltage of the pin 1 of the earphone base 21 through the voltage comparator 31, the control pin 223 of the switch circuit 22 can quickly and accurately identify the high level or low level, thereby more Accurately control the connection and disconnection of the earphone power supply circuit 23 and the second pin 2 of the earphone socket 21, that is, the opening and closing of the switch circuit 22 can be controlled more accurately, thereby effectively reducing the number of earphones being plugged in or pulled out. Noise generated during the process of headphone socket 21.

The voltage comparator is relatively common in the prior art, and the working principle of the voltage comparator will not be described in detail here.

It should be noted that there are various specific structures of the voltage dividing circuit. The following examples illustrate the specific structure of the voltage dividing circuit. The structure used in the actual manufacturing process of the terminal can be set according to actual needs. The embodiment of the present invention does not make specific limited.

As shown in FIG. 4 , the voltage divider circuit 24 includes a pull-down resistor R, one end of the pull-down resistor R is connected to the second output end 222 of the switch circuit 22, and the other end of the pull-down resistor R is connected to the terminal connected to the ground.

As shown in FIG. 5, the voltage dividing circuit 24 includes a pull-down resistor R, one end of the pull-down resistor R is connected to the second output end 222 of the switch circuit 22, and the other end of the pull-down resistor R is connected to the earphone The power supply circuit 23 is connected.

The voltage dividing circuit is used to reduce the voltage difference passing through the left or right channel of the earphone.

Preferably, when the other end of the pull-down resistor R is connected to the ground of the terminal, the resistance of the pull-down resistor R is less than or equal to 1K ohms; or, when the other end of the pull-down resistor R is connected to the earphone power supply When the circuits are connected, the resistance value of the pull-down resistor R is greater than or equal to 5K ohms. At this time, the voltage difference passing through the left sound channel or the right sound channel of the earphone is close to zero.

In the terminal provided by this embodiment, by adding a switch circuit in the terminal, when the input voltage of the control pin 223 of the switch circuit is high level or low level (for the type of earphone used with the terminal, select high level or low level), the input end 220 of the switch circuit is connected to the second output end 222 of the switch circuit, that is, the earphone power supply circuit 23 is disconnected from the second pin 2 of the earphone socket 21, Therefore, the voltage on the earphone power supply circuit 23 will not form a loop on the left channel or the right channel of the earphone, and will not emit noise from the left or right channel of the earphone, thereby effectively reducing the risk of the earphone being inserted. Or the noise generated during the process of being pulled out of the earphone socket 21 .

Embodiment two

The embodiment of the present invention further improves the terminal on the basis of the first embodiment, which can further reduce the noise during the plugging and unplugging process of the earphone.

When the earphone is inserted into or pulled out of the earphone socket 21 to the position shown in Figure 3, when the earphone socket 21 is connected to the L section of the earphone, the voltage of the first pin 1 is low, so The input end 220 of the switch circuit 22 communicates with the first output end 221 of the switch circuit 22, that is, the earphone power supply circuit 23 communicates with the second pin 2 of the earphone holder 21. If the pin 3 of the earphone holder 21 is connected to the earphone's The R section is connected, the second pin 2 of the earphone socket 21 is connected with the G section of the earphone, then the voltage on the earphone power supply circuit 23 forms a loop on the right channel of the earphone, and then noise is emitted from the right channel of the earphone. For this situation, it is necessary to redesign the length of the second pin 2 of the earphone socket. During specific implementation, the contact of the second pin 2 of the earphone holder 21 can be moved by X mm along the earphone pulling-out direction, that is, when the first pin 1 of the earphone holder 21 is just in contact with the L segment of the earphone, the earphone The contact of the second pin 2 of the seat 21 is not in contact with the G segment of the earphone, so that the voltage on the earphone power supply circuit 23 will not form a loop on the right channel of the earphone, and will not be transmitted from the right channel of the earphone. It emits noise, so it can completely eliminate the noise generated during the plugging and unplugging of headphones.

The following conditions need to be met when designing the earphone holder: after the earphone is completely inserted into the earphone holder, the contact of the second pin of the earphone holder reliably touches the earphone; and, the earphone is During the process of inserting into the earphone base, when the first pin of the earphone base is just in contact with the earphone, the contact of the second pin of the earphone base is not in contact with the conductive segment of the earphone. In this way, when the first pin 1 of the earphone base 21 communicates with the L segment of the earphone, and when the earphone power supply circuit 23 communicates with the second pin 2, the second pin 2 of the earphone base 21 does not communicate with the G segment of the earphone. Then the voltage on the earphone power supply circuit 23 will not form a loop on the right channel of the earphone, and no noise will be emitted from the right channel of the earphone, so the noise generated during the plugging and unplugging of the earphone can be completely eliminated.

For example, the following conditions must be met when designing the earphone socket 21: 1) After the earphone is completely inserted into the earphone socket 21, the contact of the second pin 2 of the earphone socket 21 can reliably touch the M segment of the earphone; 2) the earphone During the process of being inserted into the earphone socket 21, when the first pin 1 of the earphone socket 21 is just in contact with the L segment of the earphone, the contact of the second pin 2 of the earphone socket 21 is not in contact with the G segment of the earphone.

It should be noted that the specific value of X is set according to the two conditions that need to be met when designing the earphone, which is not specifically limited in the embodiment of the present invention.

Embodiment three

Fig. 6 is a system structure diagram provided by an embodiment of the present invention. As shown in FIG. 6 , the system includes the terminal and the headset in the first embodiment above.

It should be noted that, in addition to the arrangement of the second pin 2 of the earphone socket 21 mentioned in the second embodiment can completely eliminate the noise generated when the earphone is inserted into or pulled out of the earphone socket, it can also be A certain section of the headphone (compared to the corresponding section of the standard earphone) is shortened by X mm to completely eliminate the noise generated during the plugging and unplugging of the earphone. When designing the earphone, the following conditions need to be met: after the earphone is completely inserted into the earphone socket, the contact of the second pin of the earphone socket reliably touches the earphone; and, the earphone is inserted into the earphone During the process of connecting the socket, when the first pin of the earphone socket is just in contact with the earphone, the contact of the second pin of the earphone socket is not in contact with the conductive segment of the earphone.

For example, the following conditions must be met when designing an earphone: 1) After the earphone is completely inserted into the earphone socket 21, the contact of the second pin 2 of the earphone socket 21 can reliably touch the M section of the earphone; In the process of reaching the earphone base 21, when the first pin 1 of the earphone base 21 is just in contact with the L section of the earphone, the contact of the second pin 2 of the earphone base 21 is not in contact with the G section of the earphone.

Fig. 7 is a schematic structural diagram of a standard earphone in the prior art. When the line sequence of the standard earphone is L, R, G, M from left to right, as shown in Figure 8, the length of the G section of the standard earphone is A mm, and the length of the insulating layer between the G section and the M section for Bmm.

Fig. 8 is a schematic structural diagram of an improved earphone provided by an embodiment of the present invention. Fig. 8 is that the standard earphone is modified on the basis of Fig. 7, that is, the length of the G section of the improved earphone is shortened by Xmm relative to the G section of the standard earphone, as shown in Fig. 8, the length W=A-X of the G section of the improved earphone mm, the length of the insulating layer between the G segment and the M segment is B+X mm.

Equally, when the line order of earphone is L, R, M, when G, the M segment length of this earphone is set to V mm, promptly the length V=A-X mm of the M segment of this improved earphone, between M segment and G segment The length of the insulating layer is B+X mm.

It should be noted that the specific value of X is set according to the two conditions that need to be met when designing the earphone, which is not specifically limited in the embodiment of the present invention.

In the system provided by this embodiment, by adding a switch circuit in the terminal and shortening the length of a certain section of the earphone, the voltage on the earphone power supply circuit 23 will not form a loop on the left or right audio channel of the earphone, and there will be no Noise will be emitted from the left sound channel or the right sound channel of the earphone, thereby completely eliminating the noise generated when the earphone is inserted into or pulled out of the earphone socket 21 .

Those skilled in the art can clearly understand that for the convenience and brevity of description, only the division of the above-mentioned functional modules is used as an example for illustration. The internal structure of the system is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (17)

1. A kind of 1. terminal of noise when reducing headset plugging, it is characterised in that including：

   Earphone base, on-off circuit, earphone power supply circuit, bleeder circuit, the earphone base include the first pin and second pin, institute Stating on-off circuit includes control pin, input, the first output end and the second output end, the first pin of the earphone base with it is described The control pin of on-off circuit is connected, and the second pin of the earphone base is connected with the input of the on-off circuit, the switch First output end of circuit is connected with the earphone power supply circuit, the second output end and the bleeder circuit of the on-off circuit It is connected；The bleeder circuit is used to reduce the voltage difference of the L channel or R channel Jing Guo the earphone, and the terminal passes through The voltage for detecting first pin determines that the earphone is inserted into or is pulled out, and the terminal is by the second pin The earphone power supply；Before the earphone is inserted into the earphone base, the first pin of the earphone base not L sections with the earphone Contact, after the earphone is inserted into the earphone base, the first pin of the earphone base contacts with the L sections of the earphone；

   Wherein, when the input voltage of the control pin of the on-off circuit is less than the first preset voltage value, the on-off circuit The input of on-off circuit described in control foot control system connects with the first output end of the on-off circuit；When the on-off circuit When the input voltage of control pin is higher than the second preset voltage value, on-off circuit is defeated described in the control foot control system of the on-off circuit Enter end to connect with the second output end of the on-off circuit；Described terminal also includes：Voltage-adjusting unit,

   First pin of the earphone base is connected with the control pin of the on-off circuit is specially：First pin of the earphone base It is connected with one end of the voltage-adjusting unit, the control pin phase of the other end of the voltage-adjusting unit and the on-off circuit Even,

   The voltage-adjusting unit, the voltage for the first pin according to the earphone base adjust the control of the on-off circuit The input voltage of pin is less than the first preset voltage value；Or opened according to the voltage adjustment of the first pin of the earphone base The input voltage of the control pin on powered-down road is higher than the second preset voltage value；

   It need to meet following condition when designing earphone：1) after earphone is fully inserted into earphone base 21, the second pin 2 of earphone base 21 Contact can reliably touch the M sections of earphone；2) during earphone is inserted into earphone base 21, the first pin of earphone base 21 1 with the L sections rigid connection of earphone when touching, the G sections contact of the contact discord earphone of the second pin 2 of earphone base 21；

   The line sequence of standard earphone is from left to right L, R, G, during M, improve the G sections of earphone length W=A-X mm, G sections and M sections it Between the length of insulating barrier be B+X mm；

   When the line sequence of earphone is L, R, M, during G, the M segment length of the earphone is arranged to V mm, i.e. the M sections of the improvement earphone length The length of insulating barrier between V=A-X mm, M sections and G sections is B+X mm；

   Wherein, the length of insulating barrier of the length of the G sections of standard earphone between A mm, G sections and M sections be B mm, X value according to The described two conditions that need to meet are set when designing earphone.
2. 2. terminal according to claim 1, it is characterised in that including：The voltage-adjusting unit be specially voltage ratio compared with Device,

   The voltage comparator, voltage and reference voltage adjustment the switch electricity for the first pin according to the earphone base The input voltage of the control pin on road is less than the first preset voltage value；Or according to the voltage of the first pin of the earphone base and The input voltage that reference voltage adjusts the control pin of the on-off circuit is higher than the second preset voltage value.
3. 3. terminal according to claim 1, it is characterised in that also include：CPU,

   First pin of the earphone base is connected with the control pin of the on-off circuit is specially：First pin of the earphone base Being electrically connected with the CPU, the CPU electrically connects with the control pin of the on-off circuit,

   The CPU, the voltage for the first pin according to the earphone base adjust the input of the control pin of the on-off circuit Voltage is less than the first preset voltage value；Or the on-off circuit is adjusted according to the voltage of the first pin of the earphone base The input voltage of control pin is higher than the second preset voltage value.
4. 4. terminal according to claim 1, it is characterised in that including：

   The bleeder circuit includes pull down resistor, one end of the pull down resistor and the second output end phase of the on-off circuit Even,

   The other end of the pull down resistor is connected with the ground of the terminal；Or the other end of the pull down resistor and the ear Machine power supply circuit is connected.
5. 5. terminal according to claim 4, it is characterised in that including：

   When the other end of the pull down resistor is connected with the ground of the terminal, the resistance of the pull down resistor is less than or equal to 1K Europe Nurse.
6. 6. terminal according to claim 4, it is characterised in that including：

   When the other end of the pull down resistor is connected with the earphone power supply circuit, the resistance of the pull down resistor is more than or equal to 5K ohms.
7. 7. according to the terminal described in any one of claim 1 to 6, it is characterised in that including：

   The earphone base need to meet following condition：

   After the earphone is fully inserted into the earphone base, the contact of the second pin of the earphone base reliably touches described Earphone；With

   During the earphone is inserted into earphone base, when the first pin of the earphone base touches with the earphone rigid connection, institute State the conductive segment contact of the contact discord earphone of the second pin of earphone base.
8. A kind of 8. terminal of noise when reducing headset plugging, it is characterised in that including：

   Earphone base, on-off circuit, earphone power supply circuit, bleeder circuit, the earphone base include the first pin and second pin, institute Stating on-off circuit includes control pin, input, the first output end and the second output end, the first pin of the earphone base with it is described The control pin of on-off circuit is connected, and the second pin of the earphone base is connected with the input of the on-off circuit, the switch First output end of circuit is connected with the earphone power supply circuit, the second output end and the bleeder circuit of the on-off circuit It is connected；The bleeder circuit is used to reduce the voltage difference of the L channel or R channel Jing Guo the earphone, and the terminal passes through The voltage for detecting first pin determines that the earphone is inserted into or is pulled out, and the terminal is by the second pin The earphone power supply；Before the earphone is inserted into the earphone base, the first pin of the earphone base connects with the L sections of the earphone Touch, after the earphone is inserted into the earphone base, the first pin of the earphone base does not contact with the L sections of the earphone；

   Wherein, when the input voltage of the control pin of the on-off circuit is higher than the first preset voltage value, the on-off circuit The input of on-off circuit described in control foot control system connects with the first output end of the on-off circuit；When the on-off circuit When the input voltage of control pin is less than the second preset voltage value, on-off circuit is defeated described in the control foot control system of the on-off circuit Enter end to connect with the second output end of the on-off circuit；

   It need to meet following condition when designing earphone：1) after earphone is fully inserted into earphone base 21, the second pin 2 of earphone base 21 Contact can reliably touch the M sections of earphone；2) during earphone is inserted into earphone base 21, the first pin of earphone base 21 1 with the L sections rigid connection of earphone when touching, the G sections contact of the contact discord earphone of the second pin 2 of earphone base 21；

   The line sequence of standard earphone is from left to right L, R, G, during M, improve the G sections of earphone length W=A-X mm, G sections and M sections it Between the length of insulating barrier be B+X mm；

   When the line sequence of earphone is L, R, M, during G, the M segment length of the earphone is arranged to V mm, i.e. the M sections of the improvement earphone length The length of insulating barrier between V=A-X mm, M sections and G sections is B+X mm；

   Wherein, the length of insulating barrier of the length of the G sections of standard earphone between A mm, G sections and M sections be B mm, X value according to The described two conditions that need to meet are set when designing earphone.
9. 9. terminal according to claim 8, it is characterised in that also include：Voltage-adjusting unit,

   First pin of the earphone base is connected with the control pin of the on-off circuit is specially：First pin of the earphone base It is connected with one end of the voltage-adjusting unit, the control pin phase of the other end of the voltage-adjusting unit and the on-off circuit Even,

   The voltage-adjusting unit, the voltage for the first pin according to the earphone base adjust the control of the on-off circuit The input voltage of pin is less than the first preset voltage value；Or opened according to the voltage adjustment of the first pin of the earphone base The input voltage of the control pin on powered-down road is higher than the second preset voltage value.
10. 10. terminal according to claim 9, it is characterised in that including：The voltage-adjusting unit be specially voltage ratio compared with Device,

    The voltage comparator, voltage and reference voltage adjustment the switch electricity for the first pin according to the earphone base The input voltage of the control pin on road is less than the first preset voltage value；Or according to the voltage of the first pin of the earphone base and The input voltage that reference voltage adjusts the control pin of the on-off circuit is higher than the second preset voltage value.
11. 11. terminal according to claim 8, it is characterised in that also include：CPU,

    First pin of the earphone base is connected with the control pin of the on-off circuit is specially：First pin of the earphone base Being electrically connected with the CPU, the CPU electrically connects with the control pin of the on-off circuit,

    The CPU, the voltage for the first pin according to the earphone base adjust the input of the control pin of the on-off circuit Voltage is less than the first preset voltage value；Or the on-off circuit is adjusted according to the voltage of the first pin of the earphone base The input voltage of control pin is higher than the second preset voltage value.
12. 12. terminal according to claim 8, it is characterised in that including：

    The bleeder circuit includes pull down resistor, one end of the pull down resistor and the second output end phase of the on-off circuit Even,

    The other end of the pull down resistor is connected with the ground of the terminal；Or the other end of the pull down resistor and the ear Machine power supply circuit is connected.
13. 13. terminal according to claim 12, it is characterised in that including：

    When the other end of the pull down resistor is connected with the ground of the terminal, the resistance of the pull down resistor is less than or equal to 1K Europe Nurse.
14. 14. terminal according to claim 12, it is characterised in that including：

    When the other end of the pull down resistor is connected with the earphone power supply circuit, the resistance of the pull down resistor is more than or equal to 5K ohms.
15. 15. according to the terminal described in any one of claim 8 to 14, it is characterised in that including：

    The earphone base need to meet following condition：

    After the earphone is fully inserted into the earphone base, the contact of the second pin of the earphone base reliably touches described Earphone；With

    During the earphone is inserted into earphone base, when the first pin of the earphone base touches with the earphone rigid connection, institute State the conductive segment contact of the contact discord earphone of the second pin of earphone base.
16. 16. a kind of system of noise when reducing headset plugging, it is characterised in that including as described in claim any one of 1-6 Terminal and earphone；Or, terminal and earphone as described in claim any one of 8-14.
17. 17. system according to claim 16, it is characterised in that including：

    The earphone need to meet following condition：

    After the earphone is fully inserted into the earphone base, the contact of the second pin of the earphone base reliably touches described Earphone；With

    During the earphone is inserted into earphone base, when the first pin of the earphone base touches with the earphone rigid connection, institute State the conductive segment contact of the contact discord earphone of the second pin of earphone base.