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A headphone socket interface circuit

A technology of an interface circuit and an earphone holder, which is applied in the electronic field and can solve the problems of earphone POP sound, effective operation of buttons without earphone, and false detection.

Active Publication Date: 2019-04-16
LEADCORE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, the user did not perform effective operations on the headset buttons during the process
Moreover, in the process of pulling out the earphone plug from the earphone socket, the voltage on the left and right channels in the earphone has experienced a jump from being pulled up to the power state to the ground state, and the jump will cause the sound channel The charging and discharging from the input terminal of the earphone to the common terminal of the earphone, the current generated during the charging and discharging process will make the left and right channels emit POP sound
[0004] Therefore, the prior art has the following defects: in the process of pulling out the earphone plug from the earphone socket, it will be falsely detected that the user has performed an effective earphone button operation, and it will cause the left and right channels of the earphone to emit POP sounds.

Method used

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  • A headphone socket interface circuit
  • A headphone socket interface circuit
  • A headphone socket interface circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 It is an earphone socket interface circuit provided by Embodiment 1 of the present invention. see figure 1 , the structure of the earphone socket interface circuit 100 provided in this embodiment is as follows:

[0026] The first power source 110 , the second power source 120 , the headphone plug-in state detector 130 , the headphone button state detector 140 and the switch circuit 150 .

[0027] Wherein, there is a first communicable path between the first power supply 110 and the left channel shrapnel in the earphone holder, and a second connectable passage between the second power supply 120 and the microphone shrapnel in the earphone holder.

[0028] After the plug of the earphone is in contact with the shrapnel of the left sound channel, the switch circuit 150 controls the first and second connectable paths to be in a connected state, so that the first power supply 110 supplies power to the left sound channel of the headphone, and the second power supply...

Embodiment 2

[0047] figure 2 It is an earphone socket interface circuit provided by Embodiment 2 of the present invention. In this embodiment, on the basis of the first embodiment above, the structure of the switch circuit is further optimized. see figure 2 , the structure of the earphone socket interface circuit 100 provided in this embodiment is as follows:

[0048] The first power supply 110, the second power supply 120, the earphone plug state detector 130, the earphone button state detector 140 and the switch circuit 150;

[0049] Further, the switch circuit 150 includes: a first resistor 1501 , a second resistor 1502 and a P-channel MOS transistor 1503 . P-channel MOS transistor is the abbreviation of P-channel MOSFET (Metal-Oxide-Semiconductor type Field Effect Transistor, Metal-Oxide-Semiconductor Field Effect Transistor).

[0050] Among them, one end of the first resistor 1501 is connected to the first power supply 110, and the other end is connected to the gate of the P-cha...

Embodiment 3

[0090] Figure 9 It is an earphone socket interface circuit provided by the third embodiment of the present invention. In this embodiment, on the basis of the first embodiment above, the structure of the switch circuit is further optimized. see Figure 9 , the structure of the earphone socket interface circuit 100 provided in this embodiment is as follows:

[0091] The first power supply 110, the second power supply 120, the earphone plug state detector 130, the earphone button state detector 140 and the switch circuit 150;

[0092] Further, the switch circuit 150 includes: a first resistor 1501 , a second resistor 1502 and a P-channel MOS transistor 1503 .

[0093] Among them, one end of the first resistor 1501 is connected to the first power supply 110, and the other end is connected to the gate of the P-channel MOS transistor 1503; the gate of the P-channel MOS transistor 1503 is connected to the shrapnel of the left sound channel, and the source is connected to the seco...

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PUM

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Abstract

The embodiment of the invention discloses a headset base interface circuit. The circuit comprises a switching circuit, wherein after a plug of a headset is disconnected from a left channel elastic sheet, the switching circuit controls a second connectable path between a power supply for supplying power to a microphone and a microphone elastic sheet in a headset base to be in a disconnection state; a headset plug-in / out state detector judges whether the headset is plugged out of the headset base or not according to the change of a voltage on the left channel elastic sheet; and a headset key state detector judges that no valid headset key operation occurs on keys on the headset according to the change of the voltage on the microphone elastic sheet. Through the technical scheme provided by the embodiment of the invention, the defects of error detection of the headset key operation and making of POP sound by a left channel and a right channel of the headset during plugging of the headset in / out of the headset base can be overcome.

Description

technical field [0001] The embodiments of the present invention relate to the field of electronic technology, in particular to an interface circuit of an earphone socket. Background technique [0002] With the development of electronic technology, terminal devices equipped with earphone sockets are emerging, such as mobile phones, computers, personal digital assistants, and the like. After the terminal user accurately inserts the plug on the earphone into the earphone socket, he can not only listen to the audio signal played by the terminal, but also input the audio signal to the terminal through the microphone on the earphone. [0003] At present, in the process of pulling out the headphone plug from the headphone socket, the headphone socket interface circuit connected to the headphone socket will jump from a high level state to a low level state in turn according to the level of the signal terminal used to detect the button state of the headphone, and then from a high lev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00H04R1/10
Inventor 朱建荣
Owner LEADCORE TECH