Audio switching circuit based on earphone interface

Abstract

The utility model discloses an audio switching circuit based on an earphone interface. The audio switching circuit based on the earphone interface comprises a front audio switching sub-circuit, a rear audio switching sub-circuit, a front earphone interface circuit, a rear earphone interface circuit and an input switching circuit, the front and rear audio switching sub-circuit is electrically connected with the front earphone interface circuit, the rear earphone interface circuit and the input switching circuit; the front and back audio switching sub-circuit comprises an audio conversion chip; the audio conversion chip is electrically connected with the front earphone interface circuit, the back earphone interface circuit and the input switching circuit; the input switching circuit comprises a first switch chip and a second switch chip, and the first switch chip and the second switch chip are electrically connected with the audio conversion chip, the front earphone interface circuit and the rear earphone interface circuit. The beneficial effects of the utility model are that the audio equipment switching requirements in different scenes can be quickly responded, thereby providing great convenience and flexibility for users.

Description

Technical Field

[0001] This utility model relates to the field of smart terminal technology, and more specifically, to an audio switching circuit based on a headphone jack. Background Technology

[0002] In modern digital life, users have diverse needs for audio devices in various scenarios. For example, when video chatting, headphones are usually chosen to ensure privacy and sound quality; while when relaxing and enjoying music, speakers can provide a more immersive listening experience. Whether in a home environment, switching from using the TV's built-in speakers to using headphones to avoid disturbing others while playing games; or in the office, switching from external speakers during group meetings to using headphones to answer calls while working alone, users need to frequently change audio output devices. Traditional audio device switching methods are often cumbersome, requiring users to navigate through layers of system settings, which is extremely inconvenient in scenarios requiring quick switching.

[0003] Therefore, this utility model provides an audio switching circuit based on a headphone interface, which can quickly respond to the audio device switching needs in different scenarios, thus providing users with great convenience and flexibility. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides an audio switching circuit based on a headphone interface, which can quickly respond to the audio device switching needs in different scenarios, thereby providing users with great convenience and flexibility.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an audio switching circuit based on a headphone interface, wherein the improvement is that the audio switching circuit based on the headphone interface includes a front and rear audio switching sub-circuit, a front headphone interface circuit, a rear headphone interface circuit, and an input switching circuit; the front and rear audio switching sub-circuit is electrically connected to the front headphone interface circuit, the rear headphone interface circuit, and the input switching circuit.

[0006] The front and rear audio switching sub-circuit includes an audio conversion chip, which is electrically connected to the front headphone interface circuit, the rear headphone interface circuit, and the input switching circuit.

[0007] The input switching circuit includes a first switch chip and a second switch chip, both of which are electrically connected to the audio conversion chip, the front headphone jack circuit, and the rear headphone jack circuit.

[0008] In the above structure, the audio switching sub-circuit further includes resistors R1, R2, R3, and R4, capacitors C1 and C2; resistors R1, R2, R3, and C1 are all connected to the audio conversion chip; the ends of resistors R1 and R2 furthest from the audio conversion chip are connected to the second switch chip; the end of capacitor C1 furthest from the audio conversion chip is connected to the first switch chip; resistor R4 is connected between the positive terminals of resistor R3 and capacitor C2; and the negative terminal of capacitor C2 is grounded.

[0009] In the above structure, the audio conversion chip includes a VDD33 pin, an HP_R pin, an HP_L pin, a MIC_IN pin, and a MIC_BIAS pin; the VDD33 pin is connected to the first switch chip and the second switch chip; the HP_R pin is connected to a resistor R1; the HP_L pin is connected to a resistor R2; the MIC_IN pin is connected to a capacitor C1; the MIC_BIAS pin is connected to a resistor R3; the audio conversion chip is model CJC6811A.

[0010] In the above structure, the first switch chip includes a VCC pin, a N01 pin, a NO2 pin, a COM1 pin, a COM2 pin, an NC1 pin, an NC2 pin, and a GND pin. The VCC pin of the first switch chip is connected to the VDD33 pin of the audio conversion chip. The N01 and NO2 pins of the first switch chip are both connected to the front headphone jack circuit. The COM1 and COM2 pins of the first switch chip are both connected to capacitor C1. The NC1 and NC2 pins of the first switch chip are both connected to the rear headphone jack circuit. The GND pin of the first switch chip is grounded.

[0011] In the above structure, the second switch chip includes a VCC pin, a N01 pin, a NO2 pin, a COM1 pin, a COM2 pin, an NC1 pin, an NC2 pin, and a GND pin. The VCC pin of the second switch chip is connected to the VDD33 pin of the audio conversion chip. The N01 and NO2 pins of the second switch chip are both connected to the front headphone jack circuit. The COM1 and COM2 pins of the second switch chip are both connected to capacitor C1. The NC1 and NC2 pins of the second switch chip are both connected to the rear headphone jack circuit. The GND pin of the second switch chip is grounded.

[0012] In the above structure, both the first switch chip and the second switch chip are RS2000.

[0013] In the above structure, the front headphone interface circuit includes a front headphone connector, which includes PORT1_L pin, PORT1_R pin, PORT2_L pin, PORT2_R pin, and GND pin. The PORT1_L pin is connected to the NC1 pin of the first switching chip, the PORT1_R pin is connected to the NC2 pin of the first switching chip, the PORT2_L pin is connected to the NC1 pin of the second switching chip, the PORT2_R pin is connected to the NC2 pin of the second switching chip, and the GND pin is grounded.

[0014] In the above structure, the front earphone connector is model HC11051-P8.

[0015] In the above structure, the rear headphone interface circuit includes a rear headphone connector, which includes a POER_L1 pin, a POER_R1 pin, a POER_L2 pin, a POER_R2 pin, and a GND pin. The POER_L1 pin is connected to the NO1 pin of the first switching chip; the POER_R1 pin is connected to the NO2 pin of the first switching chip; the POER_L2 pin is connected to the NO1 pin of the second switching chip; the POER_R2 pin is connected to the NO2 pin of the second switching chip; and the GND pin is grounded.

[0016] In the above structure, the model number of the rear earphone connector is ABA-JAK-033.

[0017] The beneficial effects of this invention are as follows: This invention identifies the interface through which the user connects the headphones via the audio conversion chip in the audio switching sub-circuit and controls the audio routing to select either the front or rear headphone jack according to the user's needs; the front headphone jack circuit supports input and output for the front headphone jack; the rear headphone jack circuit supports input and output for the rear headphone jack; and the input switching circuit switches the input path of the audio signal; thus enabling free switching between the front and rear headphone jacks. Therefore, this invention can quickly respond to the audio device switching needs in different scenarios, thereby providing users with great convenience and flexibility. Attached Figure Description

[0018] Figure 1 This is a connection block diagram of an audio switching circuit based on a headphone interface according to the present invention.

[0019] Figure 2 This is a schematic diagram of an audio switching sub-circuit based on a headphone jack, according to the present invention.

[0020] Figure 3This is a schematic diagram of the first switching chip of an audio switching circuit based on a headphone interface according to the present invention.

[0021] Figure 4 This is a schematic diagram of the second switch chip in an audio switching circuit based on a headphone jack according to the present invention.

[0022] Figure 5 This is a schematic diagram of a front headphone interface circuit based on an audio switching circuit of the headphone interface according to the present invention.

[0023] Figure 6 This is a schematic diagram of the rear headphone jack circuit of an audio switching circuit based on a headphone jack according to the present invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0026] Reference Figure 1 As shown, this utility model discloses an audio switching circuit based on a headphone jack. The audio switching circuit based on the headphone jack includes a front and rear audio switching sub-circuit, a front headphone jack circuit, a rear headphone jack circuit, and an input switching circuit. The front and rear audio switching sub-circuit is electrically connected to the front headphone jack circuit, the rear headphone jack circuit, and the input switching circuit. The front and rear audio switching sub-circuit includes an audio conversion chip, which is electrically connected to the front headphone jack circuit, the rear headphone jack circuit, and the input switching circuit. The input switching circuit includes a first switch chip and a second switch chip, both of which are electrically connected to the audio conversion chip, the front headphone jack circuit, and the rear headphone jack circuit.

[0027] It should be noted that, in this embodiment, the front and rear audio switching sub-circuit is used to switch audio signals between the front headphone jack and the rear headphone jack, allowing the audio output to be selected according to different headphone jacks as needed. Specifically, the audio switching sub-circuit includes an audio conversion chip, which is used to identify the interface through which the user plugs in the headphones and control the audio routing to select either the front or rear headphone jack according to the user's needs. The front headphone jack circuit supports the input and output of the front headphone jack; the rear headphone jack circuit supports the input and output of the rear headphone jack; and the input switching circuit is responsible for switching the input path of the audio signal. The input switching circuit includes a first switch chip and a second switch chip. The first switch chip supports the switching on and off of the audio signal input path of the front headphone jack; the second switch chip supports the switching on and off of the audio signal input path of the rear headphone jack. In a specific implementation of this invention, the user connects headphones to the front or rear headphone jack of the host. The audio conversion chip identifies the interface connected by the user and controls the on / off state of the first and second switch chips to achieve rapid switching of the audio path according to the user's needs. Therefore, this embodiment can quickly respond to the audio device switching needs in different scenarios, thus providing users with great convenience and flexibility.

[0028] Reference Figure 2 As shown, the audio switching sub-circuit further includes resistors R1, R2, R3, and R4, capacitors C1 and C2; resistors R1, R2, R3, and C1 are all connected to the audio conversion chip; the ends of resistors R1 and R2 furthest from the audio conversion chip are connected to the second switch chip; the end of capacitor C1 furthest from the audio conversion chip is connected to the first switch chip; resistor R4 is connected between the positive terminals of resistor R3 and capacitor C2; the negative terminal of capacitor C2 is grounded; the audio conversion chip includes a VDD33 pin, an HP_R pin, an HP_L pin, a MIC_IN pin, and a MIC_BIAS pin; the VDD33 pin is connected to the first and second switch chips; the HP_R pin is connected to resistor R1; the HP_L pin is connected to resistor R2; the MIC_IN pin is connected to capacitor C1; the MIC_BIAS pin is connected to resistor R3; the audio conversion chip is model CJC6811A.

[0029] It should be noted that, in this embodiment, resistors R1, R2, R3, and R4 are designed to stabilize the audio signal level and prevent signal distortion or overload; capacitors C1 and C2 play a filtering role in the circuit to ensure stable transmission of the audio signal.

[0030] Reference Figure 3 As shown, the first switch chip includes a VCC pin, a N01 pin, a NO2 pin, a COM1 pin, a COM2 pin, an NC1 pin, an NC2 pin, and a GND pin. The VCC pin of the first switch chip is connected to the VDD33 pin of the audio conversion chip; the N01 and NO2 pins of the first switch chip are both connected to the front headphone jack circuit; the COM1 and COM2 pins of the first switch chip are both connected to capacitor C1; the NC1 and NC2 pins of the first switch chip are both connected to the rear headphone jack circuit; and the GND pin of the first switch chip is grounded. Figure 4 As shown, the second switch chip includes a VCC pin, a N01 pin, a NO2 pin, a COM1 pin, a COM2 pin, an NC1 pin, an NC2 pin, and a GND pin. The VCC pin of the second switch chip is connected to the VDD33 pin of the audio conversion chip. The N01 and NO2 pins of the second switch chip are both connected to the front headphone jack circuit. The COM1 and COM2 pins of the second switch chip are both connected to capacitor C1. The NC1 and NC2 pins of the second switch chip are both connected to the rear headphone jack circuit. The GND pin of the second switch chip is grounded. Both the first and second switch chips are of model RS2000.

[0031] It should be noted that, in this embodiment, the first switch chip and the second switch chip achieve free switching between the audio signal input to the front headphone jack and the rear headphone jack through the above-mentioned circuit connection relationship.

[0032] Reference Figure 5 As shown, the front headphone interface circuit includes a front headphone connector, which includes PORT1_L pin, PORT1_R pin, PORT2_L pin, PORT2_R pin, and GND pin. The PORT1_L pin is connected to the NC1 pin of the first switching chip, the PORT1_R pin is connected to the NC2 pin of the first switching chip, the PORT2_L pin is connected to the NC1 pin of the second switching chip, the PORT2_R pin is connected to the NC2 pin of the second switching chip, and the GND pin is grounded. The model of the front headphone connector is HC11051-P8.

[0033] It should be noted that, in this embodiment, the front headphone connector is designed to provide audio input and output for the front headphone jack.

[0034] Reference Figure 6As shown, the rear headphone interface circuit includes a rear headphone connector, which includes POER_L1, POER_R1, POER_L2, POER_R2, and GND pins. The POER_L1 pin is connected to the NO1 pin of the first switching chip; the POER_R1 pin is connected to the NO2 pin of the first switching chip; the POER_L2 pin is connected to the NO1 pin of the second switching chip; the POER_R2 pin is connected to the NO2 pin of the second switching chip; and the GND pin is grounded. The model of the rear headphone connector is ABA-JAK-033.

[0035] It should be noted that, in this embodiment, the rear headphone jack connector is designed to provide audio input and output for the rear headphone jack.

[0036] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An audio switching circuit based on a headphone jack, characterized in that, The audio switching circuit based on the headphone interface includes a front and rear audio switching sub-circuit, a front headphone interface circuit, a rear headphone interface circuit, and an input switching circuit; the front and rear audio switching sub-circuit is electrically connected to the front headphone interface circuit, the rear headphone interface circuit, and the input switching circuit. The front and rear audio switching sub-circuit includes an audio conversion chip, which is electrically connected to the front headphone interface circuit, the rear headphone interface circuit, and the input switching circuit. The input switching circuit includes a first switch chip and a second switch chip, both of which are electrically connected to the audio conversion chip, the front headphone jack circuit, and the rear headphone jack circuit.

2. The audio switching circuit based on a headphone jack according to claim 1, characterized in that, The audio switching sub-circuit also includes resistors R1, R2, R3, and R4, capacitors C1 and C2; resistors R1, R2, R3, and C1 are all connected to the audio conversion chip; the ends of resistors R1 and R2 furthest from the audio conversion chip are connected to the second switch chip; the end of capacitor C1 furthest from the audio conversion chip is connected to the first switch chip; resistor R4 is connected between the positive terminals of resistor R3 and capacitor C2; the negative terminal of capacitor C2 is grounded.

3. The audio switching circuit based on a headphone jack according to claim 2, characterized in that, The audio conversion chip includes a VDD33 pin, an HP_R pin, an HP_L pin, a MIC_IN pin, and a MIC_BIAS pin; the VDD33 pin is connected to the first switch chip and the second switch chip; the HP_R pin is connected to resistor R1; the HP_L pin is connected to resistor R2; the MIC_IN pin is connected to capacitor C1; and the MIC_BIAS pin is connected to resistor R3; the audio conversion chip is model CJC6811 A.

4. The audio switching circuit based on a headphone jack according to claim 3, characterized in that, The first switch chip includes a VCC pin, an N01 pin, a NO2 pin, a COM1 pin, a COM2 pin, an NC1 pin, an NC2 pin, and a GND pin. The VCC pin of the first switch chip is connected to the VDD33 pin of the audio conversion chip. The N01 and NO2 pins of the first switch chip are both connected to the front headphone jack circuit. The COM1 and COM2 pins of the first switch chip are both connected to capacitor C1. The NC1 and NC2 pins of the first switch chip are both connected to the rear headphone jack circuit. The GND pin of the first switch chip is grounded.

5. An audio switching circuit based on a headphone jack according to claim 4, characterized in that, The second switch chip includes a VCC pin, a N01 pin, a NO2 pin, a COM1 pin, a COM2 pin, an NC1 pin, an NC2 pin, and a GND pin. The VCC pin of the second switch chip is connected to the VDD33 pin of the audio conversion chip. The N01 and NO2 pins of the second switch chip are both connected to the front headphone jack circuit. The COM1 and COM2 pins of the second switch chip are both connected to capacitor C1. The NC1 and NC2 pins of the second switch chip are both connected to the rear headphone jack circuit. The GND pin of the second switch chip is grounded.

6. An audio switching circuit based on a headphone jack according to claim 5, characterized in that, Both the first and second switch chips are RS2000 models.

7. An audio switching circuit based on a headphone jack according to claim 6, characterized in that, The front headphone interface circuit includes a front headphone connector, which includes PORT1_L pin, PORT1_R pin, PORT2_L pin, PORT2_R pin, and GND pin. The PORT1_L pin is connected to the NC1 pin of the first switching chip, the PORT1_R pin is connected to the NC2 pin of the first switching chip, the PORT2_L pin is connected to the NC1 pin of the second switching chip, the PORT2_R pin is connected to the NC2 pin of the second switching chip, and the GND pin is grounded.

8. An audio switching circuit based on a headphone jack according to claim 7, characterized in that, The front headphone connector is model number HC11051-P8.

9. An audio switching circuit based on a headphone jack according to claim 6, characterized in that, The rear headphone interface circuit includes a rear headphone connector, which includes a POER_L1 pin, a POER_R1 pin, a POER_L2 pin, a POER_R2 pin, and a GND pin. The POER_L1 pin is connected to the NO1 pin of the first switching chip; the POER_R1 pin is connected to the NO2 pin of the first switching chip; the POER_L2 pin is connected to the NO1 pin of the second switching chip; the POER_R2 pin is connected to the NO2 pin of the second switching chip; and the GND pin is grounded.

10. An audio switching circuit based on a headphone jack according to claim 9, characterized in that, The model number of the rear earphone connector is ABA-JAK-033.

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