CN214544742U

CN214544742U - Earphone switching circuit compatible with single-ended and balanced output

Info

Publication number: CN214544742U
Application number: CN202120841829.XU
Authority: CN
Inventors: 安朝辉; 杨乐明
Original assignee: Shenzhen Jiruide Electronic Technology Co ltd
Current assignee: Shenzhen Jiruide Electronic Technology Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-10-29
Anticipated expiration: 2031-04-22

Abstract

The utility model relates to an earphone switching circuit compatible with single end and balanced output, which comprises a switching element and a control element which are connected by signals; the switching element is used for connecting the sound channel contact of the earphone interface and enabling the sound channel contact to be connected with the audio signal or grounded according to the control signal output by the control element. The earphone interface has the advantages that the single earphone interface is compatible with a single-end mode and a balanced output mode, the compatibility is good, the size of a product can be effectively reduced, the cost is saved, and the earphone interface is particularly suitable for miniaturized electronic products.

Description

Earphone switching circuit compatible with single-ended and balanced output

Technical Field

The utility model relates to an earphone circuit technical field, concretely relates to earphone switching circuit of compatible single-ended and balanced output.

Background

The TRS and TRRS are two different types of earphone interfaces, and the TRS interface is also called a single-ended output interface and is used to drive a conventional earphone. The TRRS interface is called a balanced output interface and is matched with a balanced earphone for use, compared with the TRS interface, the TRRS interface is provided with one more contact for transmitting the audio signal of the microphone, and meanwhile, the separation degree of the left sound channel and the right sound channel can be effectively improved, and the left sound channel and the right sound channel are prevented from mutual interference through a ground wire.

The two earphone interfaces are not universal and only can identify the corresponding type of earphone, so in some electronic devices, in order to be able to use the two types of earphones, the two earphone interfaces are usually arranged, which undoubtedly increases the size of the product, increases the material cost and the processing cost of the product, and is very inconvenient especially in some electronic products which pursue miniaturization.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a compatible single-ended and balanced output's earphone switching circuit. The utility model discloses enable single compatible single-ended of earphone interface and balanced output two kinds of modes, have good compatibility, can effectively reduce the product size, save the cost, be particularly useful for among the miniaturized electronic product.

The utility model provides a technical scheme that its technical problem adopted is:

the earphone switching circuit compatible with single-ended and balanced output comprises a signal connection switching element and a control element;

the switching element is used for connecting a sound channel contact of the earphone interface and enabling the sound channel contact to be connected with an audio signal or grounded according to a control signal output by the control element.

Preferably, the switching element includes a control terminal, a common terminal, and a first strobe terminal and a second strobe terminal in switching connection with the common terminal, the common terminal is used for connecting the sound channel contact, the first strobe terminal is used for accessing an audio signal, and the second strobe terminal is grounded;

the signal output end of the control element is connected with the control end, and the switching element controls the common end to be connected with the first gating end or the second gating end according to the control signal output by the control element.

Preferably, the switching element is an analog switch.

Preferably, the analog switch is of the type WSP 6580.

Preferably, the analog switch is model number WSP 658C.

Preferably, the control element is an MCU.

Preferably, the MCU is of the model STM 32.

Preferably, the model of the MCU is MSP 430.

A compatible single-ended and balanced output's earphone switching circuit, its advantage lies in: the utility model discloses a set up signal connection's switching element and control element, with the one end of switching element and the sound channel contact connection of earphone interface, the other end inserts audio signal and ground connection respectively, just so can pass through the control signal of control element output, and drive switching element gates the switching, makes the sound channel contact of earphone interface insert audio signal or ground connection. When the earphone interface is required to output a single-ended signal, the sound channel contact is grounded through the switching element, the earphone interface is in a single-ended output mode, and the earphone interface can be connected with a conventional earphone for normal use. When the earphone interface is required to output a balanced signal, the sound channel contact is connected with the audio signal through the switching element, the earphone interface is in a balanced output mode, and the earphone interface can be connected with a balanced earphone for use. Through earphone switching circuit for single earphone interface can compatible single-ended output and two kinds of mode of balanced output, can compatible conventional earphone and two kinds of equipment of balanced earphone, just so need not to set up two kinds of earphone interfaces on same electronic product respectively, can effectively reduce the product size, save material cost and processing cost are particularly useful for in some electronic products that pursue the miniaturization. Meanwhile, the circuit has the advantages of simple structure, convenience in setting, low circuit cost and convenience in control.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:

fig. 1 is a schematic structural diagram (single-ended output mode) of an earphone switching circuit according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram (balanced output mode) of the earphone switching circuit according to the embodiment of the present invention.

Description of reference numerals: 1. a switching element; 2. a control element; 3. an earphone interface.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The embodiment of the utility model provides a as shown in fig. 1, fig. 2, a compatible single-ended and balanced output's earphone switching circuit, switching element 1 and control element 2 including signal connection.

One end of the switching element 1 is connected with a sound channel contact of the earphone interface 3, the other end of the switching element is respectively connected with an audio signal and a ground of the microphone, and the switching element 1 is used for switching the connection between the sound channel contact and the audio signal and the ground wire to enable the sound channel contact to be connected between the audio signal input end and the ground wire in an alternative mode, so that the earphone interface 3 is switched between a single-end output mode and a balanced output mode. The control element 2 is used for outputting a control signal to the switching element 1 to control the switching element 1 to perform a switching gating action.

When the earphone interface 3 is required to output a single-ended signal, the sound channel contact is grounded through the switching element 1, the earphone interface 3 is in a single-ended output mode, and the earphone interface 3 can be connected with a conventional earphone for normal use.

When the earphone interface 3 is required to output a balance signal, the sound channel contact is connected to the audio signal through the switching element 1, the earphone interface 3 is in a balance output mode, and the earphone interface 3 can be connected with a balance earphone for use.

Through earphone switching circuit for single earphone interface 3 can compatible single-ended output and two kinds of mode of balanced output, can compatible conventional earphone and two kinds of equipment of balanced earphone, just so need not to set up two kinds of earphone interfaces 3 on same electronic product respectively, can effectively reduce the product size, save material cost and processing cost are particularly useful for in some electronic products that pursue the miniaturization. Meanwhile, the circuit has the advantages of simple structure, convenience in setting, low circuit cost and convenience in control.

Further, in the present embodiment, the switching element 1 is specifically gated in this way. The switching element 1 specifically includes a control terminal, a common terminal, and a first gate terminal and a second gate terminal that are in switching connection with the common terminal. Referring to fig. 1 and 2 in detail, the common terminal is used for connecting the audio channel contacts in the headphone interface 3, and the common terminal includes two connection terminals corresponding to the left audio channel contact and the right audio channel contact in the headphone interface 3, and the two connection terminals are respectively connected to the left audio channel contact and the right audio channel contact for transmitting the left audio channel signal L-and the right audio channel signal R-.

First gate end and second gate end all include two connecting terminal, and two connecting terminal of first gate end all are connected to the audio input end of microphone for insert audio signal. And the two connecting terminals of the second gating end are connected with the ground wire, so that the second gating end is grounded.

The signal output end of the control element 2 is connected with the control end of the switching element 1, the control element 2 outputs a control signal to the switching element 1 to control the switching element 1 to switch, so that the common end is connected with the first gating end or the second gating end, and then the sound channel contact of the earphone interface 3 is connected with an audio signal or grounded, so that the earphone interface 3 is switched between a balanced output mode and a single-ended output mode.

Specifically, please refer to fig. 1 in detail, in the switching element 1, the common terminal is connected to the second gating terminal, the sound channel contact of the earphone interface 3 is connected to the common terminal and then grounded, the earphone interface 3 has no microphone audio signal access, and the earphone interface 3 is in a single-terminal output mode and can be connected to a conventional earphone for use.

When the earphone interface 3 needs to be switched to the balanced output mode, the control element 2 outputs a control signal to the switching element 1 to switch the switching element 1 to be switched on, as shown in fig. 2, in the switching element 1, the common end is connected with the first gating end, the audio signal of the microphone is accessed after the sound channel contact of the earphone interface 3 is connected with the common end, and the earphone interface 3 can be connected with a balanced earphone for use in the balanced output mode.

Through foretell switching element 1 structure, can realize the switching gate of 3 sound channel contacts of earphone interface, control is stable convenient, simple structure.

Furthermore, in this embodiment, the switching element 1 is an analog switch, which can achieve a stable switching gating effect, and has high integration level and convenient setting.

More specifically, analog switch optional use Well semiconductor corporation's WSP6580 or WSP658C type analog switch, the analog switch of above-mentioned two kinds of models through practical verification, can be good be applicable to the utility model discloses an among the earphone switching circuit, have the switching stability, advantage that the integrated level is high. It should be noted that, the analog switch of two kinds of models above only is comparatively preferred model, and the analog switch model that can supply to choose for use can't be exhaustive, and the function that the required realization of switching element 1 can be according to the technical staff in the field chooses for use the close component of other functions, based on the utility model discloses a relevant description only does the relevant scheme of simple replacement on the concrete lectotype of component, all should fall into the utility model discloses an within the protection scope.

Further, in this embodiment, the control element 2 specifically selects an MCU, which has the advantages of high integration level, small size, stable control, and low energy consumption. In some possible embodiments, the signal input terminal of the MCU is connected to an external switch, and the external switch is toggled to control the MCU to output a control signal to the switching element 1, so as to control the mode switching of the earphone interface 3. The external switch can be arranged on the side surface of the electronic product, such as the side position of the earphone interface 3, which is convenient for the user to toggle. In other feasible embodiments, the MCU may be further connected to a main control chip of the electronic product, so that the signal output of the MCU may be controlled through the touch input of the electronic product, and the mode switching of the earphone interface 3 is further controlled, thereby avoiding the external switch from being set up and affecting the aesthetic appearance of the electronic product.

More specifically, MCU's model is STM32 series or MSP430 singlechip, and the MCU of above-mentioned model is through actual verification, can be good be applicable to the utility model discloses an among the earphone switching circuit, have the switching stability, advantage that the integrated level is high. Similarly, those skilled in the art can select other components with similar functions according to the functions to be implemented by the control component 2, and based on the relevant description of the present invention, the related schemes that only make simple substitutions on the specific selection types of the components should fall within the protection scope of the present invention.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. The earphone switching circuit compatible with single-ended and balanced output is characterized by comprising a switching element and a control element which are connected by signals;

2. The earphone switching circuit compatible with single-ended and balanced output according to claim 1, wherein the switching element comprises a control terminal, a common terminal, and a first gating terminal and a second gating terminal in switching connection with the common terminal, wherein the common terminal is used for connecting the sound channel contact, the first gating terminal is used for accessing an audio signal, and the second gating terminal is grounded;

3. The single-ended and balanced output compatible earphone switching circuit according to claim 2, wherein the switching element is an analog switch.

4. The single-ended and balanced output compatible earphone switching circuit according to claim 3, wherein the analog switch is model WSP 6580.

5. The single-ended and balanced output compatible earphone switching circuit according to claim 3 wherein the analog switch is model number WSP 658C.

6. A single-ended and balanced output compatible earphone switching circuit according to any of claims 1-5, wherein the control element is an MCU.

7. The single-ended and balanced output compatible earphone switching circuit according to claim 6, wherein the MCU is of the STM32 model.

8. The single-ended and balanced output compatible earphone switching circuit according to claim 6 wherein the MCU is model MSP 430.