CN113676572B - Interface circuit and electronic device - Google Patents
Interface circuit and electronic device Download PDFInfo
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- CN113676572B CN113676572B CN202110889761.7A CN202110889761A CN113676572B CN 113676572 B CN113676572 B CN 113676572B CN 202110889761 A CN202110889761 A CN 202110889761A CN 113676572 B CN113676572 B CN 113676572B
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- 230000006978 adaptation Effects 0.000 claims abstract description 15
- 238000003780 insertion Methods 0.000 claims description 23
- 230000037431 insertion Effects 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/20—Circuits for coupling gramophone pick-up, recorder output, or microphone to receiver
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Headphones And Earphones (AREA)
Abstract
The application discloses interface circuit and electronic equipment, wherein interface circuit includes: an earphone interface; the audio module is connected with the earphone interface through the adapting module; the electronic equipment comprises a frequency modulation module and a change-over switch, wherein the frequency modulation module is connected with the earphone interface through the change-over switch, the change-over switch is conducted when the electronic equipment is in a frequency modulation mode, and the frequency modulation module receives FM signals through an earphone connected with the earphone interface. In this application, the frequency modulation module sets up before the adaptation module, and the frequency modulation module passes through change over switch and earphone interface electricity is connected, like this, the transmission of FM signal need not pass through the adaptation module, and the adaptation module just can not cause the interference to the FM signal yet to can improve FM signal quality.
Description
Technical Field
The application belongs to the technical field of electronic equipment, and particularly relates to an interface circuit and electronic equipment.
Background
Electronic devices are often configured with a headset interface for connecting headphones. In order to enable the interface circuit of the earphone interface to have an audio transmission function, an audio module and an adaptation module are generally arranged in the interface circuit, and the audio module is connected with the earphone interface through the adaptation module. FM (frequency modulation radio) is a function commonly found in electronic devices, and has a low frequency (70 MHz to 120 MHz), so that an earphone line can be multiplexed into a receiving antenna of FM. Currently, an FM module of an electronic device is generally electrically connected to an earphone interface through an adapter module. However, this causes a large interference to the FM signal due to the large supply noise present in the adaptation module.
Disclosure of Invention
The application aims to provide an interface circuit and electronic equipment, and at least solves the problem that the FM signal is greatly interfered due to the fact that the adapter module has larger power supply noise.
In order to solve the technical problems, the application is realized as follows:
in a first aspect, an embodiment of the present application proposes an interface circuit, applied to an electronic device, including:
an earphone interface;
the audio module is connected with the earphone interface through the adapting module;
the electronic equipment comprises a frequency modulation module and a change-over switch, wherein the frequency modulation module is connected with the earphone interface through the change-over switch, the change-over switch is conducted when the electronic equipment is in a frequency modulation mode, and the frequency modulation module receives FM signals through an earphone connected with the earphone interface.
In a second aspect, an embodiment of the present application proposes an electronic device, including an interface circuit according to the first aspect.
In the embodiment of the application, before the frequency modulation module sets up in the adaptation module, the frequency modulation module no longer is connected with earphone interface electricity through the adaptation module, but is connected with earphone interface electricity through the change over switch, like this, the transmission of FM signal no longer passes through the adaptation module, and the adaptation module just can not cause the interference to the FM signal yet to can improve FM signal quality.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, wherein:
fig. 1 is a schematic structural diagram of an interface circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a positive and negative plug identification module according to an embodiment of the present application.
Reference numerals:
10. an earphone interface; 20. an adaptation module; 30. an audio module; 40. a change-over switch; 50. a frequency modulation module; 60. a control module;
11. a grounding pin; 12. MIC pins; 13. a positive and negative insertion identification module; 31. a grounding end; 32. a MIC end; 41. a first contact; 42. a second contact; 21. a first input; 22. a second input terminal; 23. a first output terminal; 24. a second output terminal; SBU1, first signal line; SBU2, first signal line; GND, third signal line; MIC, fourth signal line; FM, fifth signal line;
131. a voltage comparator; 1311. a first input pole; 1312. a second input electrode; 1313. an output electrode; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; VCC, a first voltage terminal; A. a first contact; B. and a second contact.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As shown in fig. 1, the embodiment of the present application provides an interface circuit, which includes an earphone interface 10, an adaptation module 20, an audio module 30, a switch 40, and a frequency modulation module 50. The audio module 30 is connected with the earphone interface 10 through the adapting module 20, and the frequency modulation module 50 is connected with the earphone interface 10 through the change-over switch 40. When the electronic device is in the frequency modulation mode, the switch 40 is turned on, and the frequency modulation module 50 receives FM signals through the earphone connected to the earphone interface 10.
The form of the earphone interface 10 is not limited, for example: 3.5mm earphone interface, interface (such as TYPE-C interface) of charging, earphone an organic whole etc..
One end of the adaptation module 20 is connected with the audio module 30 and the other end is connected with the earphone interface. One end of the change-over switch 40 is connected to the frequency modulation module 50, and the other end is connected to the earphone interface 10. That is, the frequency modulation module 50 is disposed before the adapting module 20, i.e., the frequency modulation module 50 accesses the earphone interface 10 at the input side (or front side) of the adapting module 20.
In general, the adapting module 20 is a high-speed chip, and has large power supply noise and is easy to introduce power supply noise. In this embodiment, since the frequency modulation module 50 is disposed before the adapting module 20, the frequency modulation module 50 is not electrically connected to the earphone interface 10 through the adapting module 20, but is electrically connected to the earphone interface 10 through the switch 40, so that the FM signal does not pass through the adapting module 20. In this way, on the one hand, the interference of the power noise introduced by the adapting module 20 on the FM signal can be avoided, so that the quality of the FM signal can be improved; on the other hand, the line length of FM signal transmission can be shortened, and the insertion loss of the FM signal transmission in the bandwidth can be effectively reduced.
In some embodiments, the earphone interface 10 is provided with a ground pin 11 and a MIC pin 12;
the first end of the change-over switch 40 is electrically connected with the frequency modulation module 50, the second end is provided with a first contact 41 and a second contact 42, the first contact 41 is connected with the grounding pin 11 through a first signal line SBU1, and the second contact 42 is connected with the MIC pin 12 through a second signal line SBU2.
In some embodiments, when the headset is connected to the headset interface 10 in the first connection state, the first end of the switch 40 is in communication with the first contact 41, and when the headset is connected to the headset interface 10 in the second connection state, the first end of the switch 40 is in communication with the second contact 42, such that the FM module 50 receives FM signals via the headset ground.
In this way, by providing the changeover switch 40, the FM module 50 can receive FM signals through the ground of the headset, regardless of whether the headset is connected to the headset interface 10 in the first connection state or the headset interface 10 in the second connection state.
In some embodiments, the earphone interface 10 is a TYPE-C interface, and the earphone interface 10 is provided with a ground pin 11, a MIC pin 12, and a positive and negative plug identification module 13. The TYPE-C interface can be used for inserting TYPE-C earphones, and the TYPE-C interface can be further provided with left and right channel pins (or D+ and D-pins). When the TYPE-C interface is detected to be inserted with the TYPE-C earphone, the positive and negative insertion identification module 13 can identify whether the TYPE-C earphone is inserted in the positive direction or the negative direction.
When the front-back plug identification module 13 identifies that the earphone is inserted into the earphone interface 10 in the forward direction, the first end of the switch 40 is communicated with the first contact 41, and when the front-back plug identification module 13 identifies that the earphone is inserted into the earphone interface 10 in the reverse direction, the first end of the switch 40 is communicated with the second contact 42.
Here, the first end of the switch 40 is electrically connected to the frequency modulation module 50, the second end thereof is connectable to the first signal line SBU1 and the second signal line SBU2, and the switch 40 is also electrically connected to the positive and negative insertion identification module 13. The switch 40 and the frequency modulation module 50 may be connected through a fifth signal line FM. The switch 40 can adjust the connection state of the switch 40 according to the identification result of the positive and negative insertion identification module 13.
By providing the switch 40 in this way, the FM module 50 can receive FM signals via the ground of the headset, either by inserting the headset into the headset interface 10 in the forward direction or inserting the headset into the headset interface 10 in the reverse direction.
In some embodiments, the audio module 30 includes a ground terminal 31 and a MIC terminal 32.
The adapting module 20 includes a first input end 21, a second input end 22, a first output end 23, and a second output end 24, where the first input end 21 is electrically connected to the ground pin 11 through a first signal line SBU1, the second input end 22 is electrically connected to the MIC pin 12 through a second signal line SBU2, the first output end 23 is electrically connected to the ground end 31 through a third signal line GND, and the second output end 24 is electrically connected to the MIC end 32 through a fourth signal line MIC. The adapting module 20 can adjust the connection state between each input end and each output end according to the identification result of the positive and negative insertion identification module 13.
When the identification result of the positive-negative insertion identification module 13 is positive insertion, the first input end 21 is communicated with the first output end 23, the second input end 22 is communicated with the second output end 24, the change-over switch 40 is communicated with the first signal line SBU1, and when the identification result of the positive-negative insertion identification module 13 is negative insertion, the first input end 21 is communicated with the second output end 24, the second input end 22 is communicated with the first output end 23, and the change-over switch 40 is communicated with the second signal line SBU2.
The switching logic of the switch 40 is as follows: when the TYPE-C earphone is inserted, the first signal line SBU1 is communicated with the third signal line GND, and the second signal line SBU2 is communicated with the fourth signal line MIC. At this time, the changeover switch 40 can be switched to communicate with the first signal line SBU1, and thus, the paths of the first signal line SBU1 and the third signal line GND can be used as FM antennas. When the TYPE-C earphone is reversely inserted, the original first signal line SBU1 is communicated with the third signal line GND, the second signal line SBU2 is communicated with the fourth signal line MIC, and the first signal line SBU1 is communicated with the fourth signal line MIC, and the second signal line SBU2 is communicated with the third signal line GND. At this time, the changeover switch 40 can be switched to communicate with the second signal line SBU2, and thus, the paths of the second signal line SBU2 and the third signal line GND can be used as FM antennas.
In this way, the path of the third signal line GND can be used as the FM antenna, i.e., the ground line can be used as the FM antenna, both in the forward and reverse insertion states. Compared with the use of left and right channel signal wires as the FM antenna, the use of the ground wire as the FM antenna has the following advantages: the FM signal and the left and right audio channels are not required to be coupled together, and when elements such as a capacitor and the like are required to be arranged on the left and right audio channels, the performance of the FM is not interfered.
In some embodiments, as shown in fig. 1, the interface circuit further includes a control module 60, where the control module 60 is electrically connected to the positive and negative insertion identification module 13 and the switch 40, and the control module 60 controls the first end of the switch 40 to communicate with the first contact 41 or the second contact 42 according to the identification result of the positive and negative insertion identification module 13.
Illustratively, the front-back identification module 13 may include a variable resistor, and the resistance of the TYPE-C interface may vary when the TYPE-C headset is either front-inserted or back-inserted. Thus, the control module 60 can identify the forward and reverse plug state by identifying the resistance change, so as to control the working state of the switch 40 to ensure the normal operation of FM.
In some embodiments, as shown in fig. 2, the positive-negative-plug identification module 13 includes:
the voltage comparator 131 comprises a first input pole 1311, a second input pole 1312 and an output pole 1313, wherein one of the first input pole 1311 and the second input pole 1312 is positive, the other is negative, and the output pole 1313 is electrically connected with the control module 60;
a first resistor R1 having one end electrically connected to the first voltage terminal VCC and the other end electrically connected to the first input electrode 1311;
a second resistor R2 having one end grounded and the other end electrically connected to the first input electrode 1311;
one end of the third resistor R3 is electrically connected with the first voltage end VCC, and the other end of the third resistor R3 is electrically connected with the second input electrode 1312;
a fourth resistor R4, one end of which is electrically connected with the first contact A of the TYPE-C interface, and the other end of which is electrically connected with the second input electrode 1312;
a fifth resistor R5, one end of which is electrically connected with the second contact B of the TYPE-C interface, and the other end of which is electrically connected with the second input electrode 1312,
the control module 60 controls the switch 40 to communicate with the first signal line SBU1 or the second signal line SBU2 according to the output level of the output electrode 1313.
Illustratively, the first input electrode 1311 is a positive electrode, the second input electrode 1312 is a negative electrode, and the voltage comparator 131 is operative to output a high level when the positive electrode voltage is greater than the negative electrode voltage, and otherwise output a low level.
One of the first and second contacts a and B of the TYPE-C interface is open and one is shorted (i.e., grounded). Assuming that the first contact a is open and the second contact B is short-circuited during positive insertion, the voltage at the first voltage terminal VCC flows through the third resistor R3 and the fifth resistor R5, and the voltage at the negative electrode is V- =vcc×r5/(r3+r5). When the first contact a is shorted and the second contact B is opened during the reverse insertion, the voltage of the first voltage terminal VCC flows through the third resistor R3 and the fourth resistor R4, and the voltage of the negative electrode is V-' =vcc×r4/(r3+r5). The values of R1 and R2 may be set, a reference voltage v+ is provided at the positive electrode, and the resistance values of R1 to R5 are reasonably designed to satisfy V- < v+ < V-', that is, the high level is output during the positive insertion and the low level is output during the reverse insertion, so that the control module 60 controls the switch 40 to communicate with the first signal line SBU1 or the second signal line SBU2 according to the output level of the output electrode 1313.
It should be noted that, the positive and negative insertion recognition module 13 may also have other circuit structures, which are not limited in this application.
In some embodiments, the wire diameter of the third signal line GND is greater than the wire diameter of the fourth signal line MIC.
In this embodiment, the line diameter of the third signal line GND is increased to reduce the loss of the FM signal because the path in which the third signal line GND is located is used as the FM antenna in both the forward and reverse insertion states.
In some embodiments, the wire diameter of the first signal wire SBU1 is equal to the wire diameter of the second signal wire SBU2.
In the forward insertion state, the first signal line SBU1 serves as a transmission line of the FM signal, and in the reverse insertion state, the second signal line SBU2 serves as a transmission line of the FM signal, and therefore, in this embodiment, by setting the line diameters of both to be uniform, it is advantageous to keep the loss of the FM signal uniform in any state, thereby ensuring the stability and uniformity of the FM signal.
In some embodiments, the fourth signal line MIC is a packet-grounded signal line.
Since the channel in which the fourth signal line MIC is located is not used as a transmission channel of the FM signal, the fourth signal line MIC can be subjected to the packet ground shielding process, and when the fourth signal line MIC is operated, the MIC signal can be prevented from being interfered by other signals, for example, the FM signal.
The embodiment of the application also provides electronic equipment, which comprises the interface circuit of any embodiment.
In some embodiments, the switch 40 is disposed on a flexible circuit board (Flexible Printed Circuit, FPC), and the audio module 30, the adapting module 20, and the frequency modulation module 50 are disposed on a motherboard.
In some embodiments, the interface circuit includes a control module 60, the control module 60 being electrically connected to the CPU of the electronic device.
In this way, the switching of the change-over switch 40 can be realized by the CPU, so that the control is more centralized, and the structure of the interface circuit and the electronic device is simpler.
It should be noted that, the implementation manner of the above-mentioned interface circuit embodiment is also applicable to the embodiment of the electronic device, and the same technical effects can be achieved, which is not described herein again.
In the embodiment of the application, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (personal digital assistant, PDA), or the like.
Other constructions and operations of electronic devices according to embodiments of the present application are known to those of ordinary skill in the art and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. An interface circuit for use in an electronic device, comprising:
an earphone interface;
the audio module is connected with the earphone interface through the adapting module;
the electronic equipment comprises a frequency modulation module and a change-over switch, wherein the frequency modulation module is connected with an earphone interface through the change-over switch, the change-over switch is conducted when the electronic equipment is in a frequency modulation mode, and the frequency modulation module receives FM signals through an earphone connected with the earphone interface;
the earphone interface is provided with a grounding pin and an MIC pin;
the first end of the change-over switch is electrically connected with the frequency modulation module, the second end of the change-over switch is provided with a first contact and a second contact, the first contact is connected with the grounding pin through a first signal wire, and the second contact is connected with the MIC pin through a second signal wire;
when the earphone is connected with the earphone interface in a first connection state, the first end of the switch is communicated with the first contact, and when the earphone is connected with the earphone interface in a second connection state, the first end of the switch is communicated with the second contact, so that the FM module receives FM signals through the ground wire of the earphone.
2. The interface circuit of claim 1, wherein the earphone interface is a TYPE-C interface, and the earphone interface is further provided with a positive and negative plug identification module;
when the positive and negative insertion identification module identifies that the earphone is inserted into the earphone interface in the positive direction, the first end of the change-over switch is communicated with the first contact, and when the positive and negative insertion identification module identifies that the earphone is inserted into the earphone interface in the negative direction, the first end of the change-over switch is communicated with the second contact.
3. The interface circuit of claim 2, further comprising a control module electrically connected to the positive and negative plug identification module and the switch, respectively, wherein the control module controls the first end of the switch to communicate with the first contact or the second contact according to the identification result of the positive and negative plug identification module.
4. The interface circuit of claim 3, wherein the positive-negative-plug identification module comprises:
the voltage comparator comprises a first input pole, a second input pole and an output pole, one of the first input pole and the second input pole is an anode, the other is a cathode, and the output pole is electrically connected with the control module;
one end of the first resistor is electrically connected with the first voltage end, and the other end of the first resistor is electrically connected with the first input electrode;
a second resistor, one end of which is grounded and the other end of which is electrically connected with the first input electrode;
one end of the third resistor is electrically connected with the first voltage end, and the other end of the third resistor is electrically connected with the second input electrode;
one end of the fourth resistor is electrically connected with the first contact of the earphone interface, and the other end of the fourth resistor is electrically connected with the second input electrode;
a fifth resistor, one end of which is electrically connected with the second contact of the earphone interface, and the other end of which is electrically connected with the second input electrode,
the control module controls the first end of the change-over switch to be communicated with the first contact or the second contact according to the output level of the output electrode.
5. The interface circuit of claim 1, wherein the audio module comprises a ground terminal and a MIC terminal;
the adaptation module comprises a first input end, a second input end, a first output end and a second output end, wherein the first input end is electrically connected with the grounding pin through a first signal wire, the second input end is electrically connected with the MIC pin through a second signal wire, the first output end is electrically connected with the grounding end through a third signal wire, and the second output end is electrically connected with the MIC end through a fourth signal wire.
6. An electronic device comprising the interface circuit of any one of claims 1 to 5.
7. The electronic device of claim 6, wherein the switch is disposed on a flexible circuit board FPC, and the audio module, the adaptation module, and the frequency modulation module are disposed on a motherboard.
8. The electronic device of claim 6, wherein the interface circuit comprises a control module electrically connected to a CPU of the electronic device.
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| CN202110889761.7A CN113676572B (en) | 2021-08-04 | 2021-08-04 | Interface circuit and electronic device |
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| CN202110889761.7A CN113676572B (en) | 2021-08-04 | 2021-08-04 | Interface circuit and electronic device |
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| CN115878531B (en) * | 2022-12-09 | 2024-03-15 | 珠海视熙科技有限公司 | MiPi interface control method, electronic equipment, camera module, storage medium and video system |
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| CN108063992A (en) * | 2017-12-12 | 2018-05-22 | 广东小天才科技有限公司 | Bluetooth headset, conversion earphone socket and bluetooth and the method for wired earphone conversion |
| CN110166867A (en) * | 2019-05-09 | 2019-08-23 | 广州三星通信技术研究有限公司 | Digital earphone and electric terminal |
| CN214756880U (en) * | 2021-06-11 | 2021-11-16 | 维沃移动通信有限公司 | Interface circuit and electronic device |
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| CN113676572A (en) | 2021-11-19 |
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