WO2013067812A1

WO2013067812A1 - Headset socket circuit

Info

Publication number: WO2013067812A1
Application number: PCT/CN2012/076726
Authority: WO
Inventors: 董玲玲; 刘斌; 佘海波; 高婧
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-11-10
Filing date: 2012-06-11
Publication date: 2013-05-16
Also published as: CN202310052U

Abstract

Disclosed is a headset socket circuit, comprising a first pin (1), a second pin (6), a left sound channel audio output pin (5), a right sound channel audio output pin (2), and four switching elements; the second pin (6) is connected to an MIC via a first switching element (71) and is grounded via a second switching element (72); the first pin (1) is connected to the MIC via a third switching element (73) and is grounded via a fourth switching element (74); a pull-up resistor (8) is connected to the left sound channel audio output pin (5) or the right sound channel audio output pin (2), with high power level at the connection; a signal detection terminal is connected to the left sound channel audio output pin (5) or the right sound channel audio output pin (2) connected with the pull-up resistor, and is configured to detect power level variation at the connection. With the present invention, a headset socket circuit achieves headset compatibility.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of communications, and in particular to a headphone jack circuit. BACKGROUND OF THE INVENTION With the development of electronic technology, portable devices have been widely used in all corners of modern life, and become an indispensable tool in life and work. Headphones have become an indispensable accessory for various portable devices. Listening to music, answering calls, etc. bring convenience. However, there are currently two types of headphones on the market: American standard headphones and European standard headphones. 1 is a schematic diagram of a European standard earphone plug and a corresponding earphone socket according to the related art, and FIG. 2 is a schematic diagram of an American standard earphone plug and a corresponding earphone socket according to the related art. With the internationalization of the portable device market, portable devices are required to be compatible with both standard headphones, and there are circuits compatible with both types of headphones in the prior art. 3 is a schematic diagram of a headset compatible circuit according to the related art. As shown in FIG. 3, a compatible design of an American standard earphone and an European standard earphone is made in the circuit design, and the patch material is adjusted to be compatible with different types of earphones. In the market of European standard headphones, R1 and R4 are attached to Oohm resistors, and R2 and R3 are not attached. In the market where American standard headphones are used, the chips are Rohm and R3 stickers, and R1 and R4 are not attached. However, the compatibility of existing compatible circuits is poor. For the user, although the existing compatible circuit is designed to be compatible with both earphone standards, the final portable product produced by the compatible circuit can only Supporting a standard type of earphones results in poor versatility, and in markets where the demand for headphones is different, since the portable product motherboard cannot share the motherboard, the versatility of the portable product motherboard is also poor. SUMMARY OF THE INVENTION The present invention provides a headphone jack circuit to at least solve the problem of poor versatility of existing compatible circuits. According to an aspect of the present invention, a headphone jack circuit is provided, including a first pin 1, a second pin 6, a left channel audio output pin 5, and a right channel audio output pin 2, and further includes: Four switching elements, the second pin 6 is connected to the MIC through the first switching element 71, and connected to the ground through the second switching element 72; the first pin 1 is connected to the MIC through the third switching element 73, and through the fourth switching element 74 is connected to the ground; wherein, the initial state of the four switching elements is an off state, and the breaking of the four switching elements is controlled by a change of a level detected by the detection signal terminal; the pull-up resistor 8 Connected to the left channel audio output pin 5 or the right channel The audio output pin 2, wherein a level of the pull-up resistor connected to the left channel audio output pin 5 or the right channel audio output pin 2 is a high level; the detection signal end And connected to the left channel audio output pin 5 or the right channel audio output pin 2 to which the pull-up resistor is connected, and configured to detect a change in the level of the connection. Preferably, in the state of use, the first switching element 71 and the fourth switching element 74 are in an on state, and the second switching element 72 and the third switching element 73 are in an off state; or The first switching element 71 and the fourth switching element 74 are in an off state, and the second switching element 72 and the third switching element 73 are in an on state. Preferably, the four switching elements are MOS tubes or analog switches. Preferably, the four switches are four single pole single throw switches or two sets of single pole double throw switches. Preferably, the pull-up resistor 8 has a resistance of 10K ohms. Through the utility model, the switching element is applied to the circuit, and the closed and disconnected state of the switching element is controlled by the signal detection terminal signal change, so that the final earphone socket product can be compatible with two different standard earphones, thereby solving the existing In the technology, the versatility of the compatible circuit is poor, and the headset socket of the portable product can be compatible with the American standard earphone and the European standard earphone. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate, FIG. Improperly qualified. In the drawings: FIG. 1 is a schematic diagram of a European standard earphone plug and a corresponding earphone socket according to the related art; FIG. 2 is a schematic diagram of an American standard earphone plug and a corresponding earphone socket according to the related art; FIG. 3 is compatible with the earphone according to the related art. FIG. 4 is a schematic diagram of another circuit socket circuit according to an embodiment of the present invention; FIG. 6 is a schematic diagram of another circuit socket circuit according to an embodiment of the present invention; A schematic diagram of a headphone jack circuit; and FIG. 7 is a flow chart of a method for implementing a headphone jack circuit compatible headset in accordance with the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. Since the chip resistors are used in the compatible design circuits in the prior art, the final product can only conform to one standard earphone, thus making the existing compatible circuits less versatile. In order to solve the problem of poor versatility of the existing compatible circuit, in the present invention, a headphone socket circuit is provided, which controls the closing and opening states of the switching element by using a switching element in the circuit to change the signal of the signal detecting end. Thus, the final headphone jack product can be compatible with two different standard headphones. 4 is a schematic diagram of a headphone jack circuit according to an embodiment of the present invention. As shown in FIG. 4, the circuit includes a first pin 1, a second pin 6, a left channel audio output pin 5, and a right channel audio. The output pin 2, the first earphone detecting port 3, and the second earphone detecting port 4 further include: four switching elements and a pull-up resistor 8. Wherein, the second pin 6 is connected to the MIC through the first switching element 71, and is connected to the ground through the second switching element 72; the first pin 1 is connected to the MIC through the third switching element 73, and is connected to the MIC through the third switching element 74 Wherein, the initial states of the four switching elements are all off, the breaking of the four switching elements is controlled by the change of the level detected by the detecting signal terminal; the pull-up resistor 8 is connected to the right channel audio Output pin 2, wherein the level of the connection between the pull-up resistor and the right channel audio output pin 2 is high; the detection signal end is connected to the right channel audio output pin 2 connected to the pull-up resistor, setting To detect changes in the level at the junction. Through the above-mentioned earphone socket circuit, the switching element is applied to the circuit, and the signal detecting terminal signal changes to control the closing and opening states of the switching element, so that the earphone socket can be compatible with two different standard earphones, and the prior art is solved. The problem of poor versatility of the compatible circuit, and thus the headset socket of the portable product can be compatible with the American standard earphone and the European standard earphone. When the above circuit is in use, the operating states of the four switching elements include: the first switching element 71 and the fourth switching element 74 are in an on state, and the second switching element 72 and the third switching element 73 are in an off state; or The first switching element 71 and the fourth switching element 74 are in an off state, and the second switching element 72 and the third switching element 73 are in an on state. In the above earphone jack circuit, the four switching elements may be MOS tubes or analog switches. In the above earphone jack circuit, the four switches may be four single pole single throw switches or two sets of single pole double throw switches. In the above earphone socket circuit, the resistance of the pull-up resistor 8 may be 10K ohms. It should be noted that the function of the pull-up resistor here is to pull the level up to a high level with respect to the resistance of the earphone 32 ohms. The resistance value, for example, may also be 5K, 8Κ, or the like. It should be noted that the pull-up resistor 8 can also be connected to the left channel audio output pin 5, FIG. 5 is a schematic diagram of another circuit socket circuit according to an embodiment of the present invention, as shown in FIG. In the example, the socket circuit is different from the socket circuit shown in FIG. 4 in that: the pull-up resistor 8 is connected to the left channel audio output pin 5, wherein the pull-up resistor 8 and the left channel audio output pin 5 The level of the connection is high; the detection signal terminal is connected to the left channel audio output pin 5 to which the pull-up resistor is connected, for detecting the change in the level at the connection. Other components are the same as those shown in FIG. 4 and will not be described again. In the preferred embodiment, a compatible American standard earphone and an European standard earphone socket circuit and an implementation method thereof are provided, the circuit comprising: a headphone socket, a plurality of switch control units, and a left channel or a right sound connected to the earphone socket Pull-up resistor on the track. FIG. 6 is a schematic diagram of a headphone jack circuit according to a preferred embodiment of the present invention. The method for implementing the circuit will be described below with reference to FIG. 6. As shown in FIG. 6, including a headphone jack connector J1, switch control elements S1, S2, S3, S4 (corresponding to the switching elements 71, 72, 73, 74 in FIGS. 4 and 5), wherein the switching elements may have There are many ways, such as MOS tubes, analog switches, etc., the switch form can be varied, such as four single-pole single-throw switches, or two sets of single-pole double-throw switches. Connect the 10K ohm pull-up resistor R5 (equivalent to pull-up resistor 8) on the 2nd pin of the headphone jack (ie, the right channel audio output pin 2, corresponding to the right channel of the headphone 1 _0171), and connect it to the headphone jack. The earphone type detection signal HEADSET_TYPE_DET on the second pin of J301 (corresponding to the detection signal terminal) and the control module that completes the switch control and the detection signal judgment (it is required that the control module is not shown in the figure). The above-mentioned earphone socket circuit is realized by using the left and right channel impedance of the earphone to the ground impedance of 32 ohm ohm, and respectively controlling the physical continuity of the headphone socket 1 and 6 feet to the ground through the switch unit circuit, when detecting When one of the two pins is connected to the ground, the impedance of the left and right channels of the earphone to the ground becomes 32 ohm, so that the earphone type detection signal connected to the left channel or the right channel of the earphone socket is effective. That is, the foot is considered to be the ground pin of the earphone, and the other foot is the MIC pin of the earphone. Thereby the switch unit is correctly controlled to ensure that the earphone circuit operates in the correct mode. 7 is a flow chart of a method for implementing a headphone jack circuit compatible earphone according to the present invention. As shown in FIG. 7, the flow includes the following steps: When the earphone is not inserted, the initial state of the circuit is: The earphone type detection signal HEADSET_TYPE_DET passes The 10K resistor R5 is pulled up to maintain a high level signal, and each switching element is in an off state. Due to the right side of the headset There is a 32 ohm impedance between the channel and the ground terminal of the earphone, so after the earphone is inserted, the impedance between the 1st or 6th pin of the earphone socket and the right channel pin 2 of the earphone will become 32 ohm, and the earphone type detection signal will be HEADSET TYPE DET is pulled low. In step S701, the earphone is inserted. Step S702, the switching element S4 is closed, so that the 6 pin of the earphone socket is grounded. In step S703, it is determined whether the level of the earphone type detection signal HEADSET_TYPE_DET is low. If it is low, step S704 is performed; otherwise, step S706 is performed. In step S704, the HEADSET_TYPE_DET signal changes from high to low, indicating that the 6-pin of the earphone socket corresponds to the ground pin of the earphone, and it is determined that the earphone is an European standard earphone. Step S705, the switching element S1 is closed, so that the 5 pins of the earphone socket are connected to the MIC signal, and the circuit operates in the European standard earphone mode. Step S706, if the switching element S4 is closed, the HEADSET_TYPE_DET is still high, indicating that the 6-pin of the earphone socket corresponds to the ground pin of the earphone, and it is determined that the non-European standard earphone is inserted. In step S707, the switching element S4 is turned off, and the pinch socket 6 pin is disconnected from the ground. Step S708, the switching element S2 is closed, so that the 5-pin of the earphone socket is connected to the ground. In step S709, it is determined whether the HEADSET_TYPE_DET signal is low. If the HEADSET_TYPE_DET signal changes from high to low, step S710 is performed, otherwise, step S712 is performed. In step S710, the HEADSET TYPE DET signal changes from high to low, indicating that the 5-pin of the earphone socket corresponds to the ground pin of the earphone, and it is determined that the American standard earphone is inserted. Step S711, the switching element S3 is closed, and the circuit operates in the American standard headphone mode. In step S712, when the HEADSET_TYPE_DET is still high, it is determined that the inserted earphone is a non-standard earphone, which is neither a European standard earphone nor an American standard earphone. Through the above steps, the type of the earphone inserted can be detected, thereby controlling the switching element to operate the earphone circuit in a matching mode with the type of the inserted earphone. The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made by those skilled in the art. Where in the spirit of the present invention Within the principles, any modifications, equivalent substitutions, improvements, etc., are intended to be included within the scope of the present invention.

Claims

1. A headphone jack circuit comprising a first pin (1), a second pin (6), and a left channel audio output pin

(5), right channel audio output pin (2), also includes:

Four switching elements, the second pin (6) is connected to the MIC through the first switching element (71), to the ground through the second switching element (72); the first pin (1) is passed through the third switching element (73) Connected to the MIC, connected to the ground through the fourth switching element (74); wherein the initial states of the four switching elements are all in an off state, and the breaking of the four switching elements is controlled by the detection signal end The detected level change;

a pull-up resistor (8) connected to the left channel audio output pin (5) or the right channel audio output pin (2), wherein the pull-up resistor and the left channel audio output The level of the pin (5) or the right channel audio output pin (2) is high;

The detection signal end is connected to the left channel audio output pin (5) or the right channel audio output pin (2) connected to the pull-up resistor, and is set to detect the level of the connection. Variety.

2. The circuit according to claim 1, wherein, in a state of use, the first switching element (71) and the fourth switching element (74) are in an on state, and the second switching element (72) is The third switching element (73) is in an off state; or, the first switching element (71) and the fourth switching element (74) are in an off state, and the second switching element (72) is The third switching element (73) is in an on state.

3. The circuit according to claim 1 or 2, wherein the four switching elements are MOS tubes or analog switches.

4. The circuit according to claim 1 or 2, wherein the four switches are four single pole single throw switches or two sets of single pole double throw switches.

5. The circuit of claim 3, wherein the four switches are four single pole single throw switches or two sets of single pole double throw switches.

6. The circuit according to claim 1 or 2, wherein the pull-up resistor (8) has a resistance of 10K ohms. The circuit according to claim 3, wherein said pull-up resistor (8) has a resistance of 10K ohms.

8. The circuit according to claim 4, wherein the pull-up resistor (8) has a resistance of 10K ohms.

9. The circuit according to claim 5, wherein the pull-up resistor (8) has a resistance of 10K ohms.