CN107728991B

CN107728991B - Electronic equipment and FM playing method

Info

Publication number: CN107728991B
Application number: CN201710927729.7A
Authority: CN
Inventors: 黄龙海; 许杰峰; 龚盈颖
Original assignee: Lenovo Beijing Ltd
Current assignee: Lenovo Beijing Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2021-01-15
Anticipated expiration: 2037-09-30
Also published as: CN107728991A

Abstract

The present disclosure provides an electronic device, including: the earphone interface is connected with a wired earphone; FM processing circuit, connect with the first ground connection point of earphone interface, include: the suppression circuit is connected with the first ground connection point of the earphone interface, comprises a second ground connection point used for being connected with the ground of the electronic equipment and is used for preventing the FM band signals obtained by the FM antenna from being attenuated; the FM antenna matching circuit is connected with the first ground connection point of the earphone interface and used for realizing power matching between the electronic equipment and the FM antenna; the FM receiving chip is connected with the FM antenna matching circuit and used for receiving the waveband signal transmitted by the FM radio station through the FM antenna; the processing chip is connected with the FM receiving chip and used for converting the FM waveband signals into audio signals and transmitting the audio signals to the main body of the earphone through a wire body of the wired earphone to be output; the FM antenna is connected to the wire body of the wired earphone of the earphone interface and the earphone interface of the wired earphone. The present disclosure also provides an FM playing method.

Description

Electronic equipment and FM playing method

Technical Field

The present disclosure relates to an electronic device and an FM playback method.

Background

At present, many mobile terminal devices integrate a Frequency Modulation (FM) function, and an antenna with a corresponding length is required for receiving an FM signal. In the related art, various schemes for implementing the FM antenna function are provided, such as implementing the FM antenna function through an earphone socket and a common earphone cable, or implementing the FM antenna function through a built-in FM antenna.

In order to meet the trend of ultra-thinning design, more and more mobile terminal devices are equipped with TYPE C interfaces, i.e. C interfaces, which have strong expansion capability and can transmit audio and video signals, and are a connection interface of USB interfaces, and are a brand new form of USB interfaces.

However, in implementing the embodiments of the present disclosure, the inventors found that there are at least the following drawbacks in the related art: the mobile terminal device configured with the class-C interface cannot realize the FM antenna function based on the earphone socket and the common earphone cable.

Disclosure of Invention

In view of this, the present disclosure provides an electronic device and an FM playing method.

One aspect of the present disclosure provides an electronic device, including: the earphone interface is used for connecting a wired earphone; an FM processing circuit connected to a first ground connection point of the headphone interface, the FM processing circuit including: a suppression circuit connected to the first ground connection point of the earphone interface, the suppression circuit including a second ground connection point for connecting to a ground of the electronic device, the suppression circuit being configured to prevent attenuation of an FM band signal received by an FM antenna; an FM antenna matching circuit connected to the first ground connection point of the earphone interface, the FM antenna matching circuit being configured to implement power matching between the electronic device and an FM antenna; the FM receiving chip is connected with the FM antenna matching circuit and used for receiving band signals transmitted by the FM radio station through the FM antenna; the processing chip is connected with the FM receiving chip and used for converting the FM waveband signals into audio signals and transmitting the audio signals to the main body of the earphone through the wire body of the wired earphone for output; the FM antenna is a wire body of the wired earphone connected to the earphone interface and the earphone interface connected with the wired earphone.

Optionally, the electronic device further includes: and the audio decoding chip is used for obtaining the audio signal through a connecting channel of the FM processing circuit and transmitting the audio signal to a wire body passing through the earphone through a connecting channel of a left channel and a right channel of the earphone interface so as to output the audio signal.

Optionally, the earphone interface is a TYPE C interface, and the electronic device further includes: a metal-oxide-semiconductor field effect transistor (MOSFET) switch arranged on a connecting channel between the FM processing circuit and the ground of the earphone interface and used for reducing FM receiving signal loss and noise and enabling the earphone ground wire to be used as an FM antenna, and ensuring that an FM antenna channel is always connected with the ground wire of TYPE C when the TYPE C interface is inserted positively and negatively; the processing chip is used for controlling the MOSFET switch to enable the FM processing circuit to be conducted with the ground connection channel of the earphone interface when the FM function of the electronic equipment is enabled.

Optionally, the MOSFET switch is further located on a connection channel between the audio codec chip and an MIC terminal of the earphone interface; the baseband processing chip carries out corresponding switching action through the positive and negative circumstances of inserting of general input output (GPIO) logical control MIC terminal and ground wire following TYPE C, guarantees that the FM antenna is connected to TYPE C's ground wire all the time on, guarantees the reliable correct connection of FM antenna.

Optionally, the electronic device further includes: a switch, which is arranged between the audio coding and decoding chip and the connection channel of the left and right sound channels of the earphone interface, and is used for matching the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface, and matching the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface reversely.

Another aspect of the present disclosure provides a method for implementing FM broadcasting, where the method includes: determining whether a wired earphone is connected through an earphone interface of the electronic equipment; and responding to a trigger instruction of FM playing based on the result information that the wired earphone is connected with the earphone interface, and enabling an FM processing circuit connected with a ground connection point of the earphone interface on the electronic equipment, wherein the FM processing circuit receives FM waveband signals based on the wire body of the wired earphone, and the wire body of the wired earphone and the connection interface when the wired earphone is connected are jointly used as an FM antenna.

Optionally, the electronic device includes an audio codec chip, wherein the decoding chip is connected to the FM processing circuit; and the above method further comprises: the audio decoding chip is used for obtaining the audio signal through a connecting channel of the FM processing circuit and transmitting the audio signal to a wire body passing through the earphone through a connecting channel of a left channel and a right channel of the earphone interface so as to output the audio signal.

Optionally, the earphone interface is a TYPE C interface, and the electronic device further includes a MOSFET switch; and the above method further comprises: the FM receiving signal loss and noise are reduced through the MOSFET switch arranged on the connecting channel between the FM processing circuit and the ground of the earphone interface, the earphone ground wire is used as an FM antenna, and when the TYPE C interface is inserted positively and negatively, the FM antenna channel is always connected with the TYPE C ground wire; and the processing chip is used for controlling the MOSFET switch to enable the FM processing circuit to be conducted with the ground connection channel of the earphone interface when the FM function of the electronic method is enabled.

Optionally, the method further includes: make baseband processing chip follow TYPE C's positive and negative condition of inserting through GPIO logic control MIC terminal and ground wire and carry out corresponding switching action, guarantee that the FM antenna is connected to TYPE C's ground wire all the time on, guarantee the reliable correct connection of FM antenna.

Optionally, the electronic device further includes a switch, which is disposed between the audio codec chip and a connection channel between the audio codec chip and the left and right channels of the earphone interface; and the above method further comprises: the left and right channels are matched with the left and right channels of the earphone when the connector of the earphone is inserted into the earphone interface, and the left and right channels are matched with the left and right channels of the earphone when the connector of the earphone is inserted into the earphone interface reversely.

Drawings

For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:

fig. 1 schematically shows a schematic view of an electronic device according to an embodiment of the present disclosure;

FIG. 2A schematically illustrates a schematic view of an electronic device according to another embodiment of the present disclosure;

FIG. 2B schematically shows a schematic view of an electronic device according to another embodiment of the present disclosure;

FIG. 2C schematically shows a schematic view of an electronic device according to another embodiment of the present disclosure; and

fig. 3 schematically shows a schematic diagram of an FM playing method according to an embodiment of the present disclosure.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is illustrative only and is not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.

Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a convention analogous to "A, B or at least one of C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B or C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "a or B" should be understood to include the possibility of "a" or "B", or "a and B".

Some block diagrams and/or flow diagrams are shown in the figures. It will be understood that some blocks of the block diagrams and/or flowchart illustrations, or combinations thereof, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the instructions, which execute via the processor, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.

Accordingly, the techniques of this disclosure may be implemented in hardware and/or software (including firmware, microcode, etc.). In addition, the techniques of this disclosure may take the form of a computer program product on a computer-readable medium having instructions stored thereon for use by or in connection with an instruction execution system. In the context of this disclosure, a computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the instructions. For example, the computer readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. Specific examples of the computer readable medium include: magnetic storage devices, such as magnetic tape or Hard Disk Drives (HDDs); optical storage devices, such as compact disks (CD-ROMs); a memory, such as a Random Access Memory (RAM) or a flash memory; and/or wired/wireless communication links.

At present along with the popularization of TYPE C interface and demand such as ultra-thin design of cell-phone and multiaerial design more and more, simultaneously because the height and the occupation space of earphone seat are great, lead to unable ordinary earphone seat of utilization to design the FM antenna, especially to the mobile terminal equipment who disposes TYPE C interface, can't realize the FM antenna function based on earphone seat and ordinary earphone cord.

To the electronic equipment that has TYPE C interface that popularizes day by day, often hope to utilize TYPE C interface on the basis of realizing basic audio playback, can also realize FM instant music, in view of this, this disclosure provides an electronic equipment that can realize the function, when satisfying audio playback effect, when needing to realize the FM function, can realize the FM antenna function with the help of the earphone that inserts the earphone interface, save height and the great earphone seat of occupation space, can also realize electronic equipment's ultra-thin design when realizing the FM function, user experience is better.

In the following, an electronic device, which is a mobile phone, is taken as an example, and it is understood that the application scenario of the embodiment is only illustrative and cannot limit or narrow the scope of the present disclosure.

An electronic device provided by the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

Fig. 1 schematically shows a schematic view of an electronic device according to an embodiment of the disclosure.

As shown in fig. 1, the electronic device 100 may include:

and an earphone interface 101 for connecting a wired earphone.

FM processing circuit, FM processing circuit and earphone interface's first ground connection point are connected, and FM processing circuit includes:

a suppression circuit 102 connected to the first ground connection point of the earphone interface, the suppression circuit including a second ground connection point for connecting to a ground of the electronic device, the suppression circuit for preventing attenuation of an FM band signal obtained by the FM antenna;

the FM antenna matching circuit 103 is connected with the first ground connection point of the earphone interface and is used for realizing power matching between the electronic equipment and the FM antenna;

the FM receiving chip 104 is connected with the FM antenna matching circuit and used for receiving band signals transmitted by the FM radio station through the FM antenna;

and the processing chip 105 is connected with the FM receiving chip and used for converting the FM waveband signal into an audio signal and transmitting the audio signal to the main body of the earphone through the wire body of the wired earphone for output.

It should be noted that, when the FM radio function is started, the FM antenna is a line body of the wired earphone connected to the earphone interface and the earphone interface connected to the wired earphone.

The earphone Interface may be a standard TYPE C Interface, and it should be noted that the TYPE C Interface is called a USB TYPE C Interface, and is a connection Interface of a Universal Serial Bus (USB) Interface, except that the TYPE C Interface can support the functions of charging, data transmission, display output and the like of the USB standard as well as other connection interfaces, the TYPE C Interface has a strong expandability, can transmit audio and Video signals, and is expanded into various audio and Video output interfaces, such as a High Definition Multimedia Interface (HDMI), a Video Graphics Array (VGA), a Digital Video Interface (DVI), and even can realize extended transmission reaching a resolution of 4K. Because TYPE C only provides the channel, the Audio frequency Audio agreement that USB interface of other interfaces did not have has walked inside, so can realize the transmission of Audio-visual signal through TYPE C.

TYPE C supports positive and negative insertion, four sets of power supplies and Ground (GND for short) are provided on the front and the back, generally, in order to prevent the metal casing of the mobile phone from being discharged and hitting other devices on the metal plate when encountering static electricity, the most effective method is to Ground the metal casing of the mobile phone, but the Ground can absorb FM signals, so that certain sensing inductors or magnetic beads can be connected between the casing and the main board to form a suppression circuit, thereby enhancing signal isolation between the FM signals and the Ground, and simultaneously preventing attenuation of FM band signals obtained by the FM antenna, thereby achieving the effect of improving the strength of the FM signals.

The FM signal frequency range is generally between 88MHz-108MHz, the length of the antenna required for receiving signals with such wavelengths is about 75 cm, while the frequency of signals received by the mobile phone is much higher than the FM frequency, generally between 900MHz or 1800MHz, so the wavelength only needs several cm, and the corresponding receiving antenna is very short. The signal frequency itself used for reception, i.e. the antenna length, is small and cannot be used for receiving FM antennas, so that additional FM antennas are required. However, it is not practical to make an antenna in a mobile phone alone, so that the ground wire of the earphone is used as an antenna to receive FM signals. The antenna pin of the FM chip is externally connected with an amplifier and then is externally connected with a GND ground of the earphone. Meanwhile, due to the difference between the received FM signal energy and the signal energy of the mobile phone, some matching needs to be added, for example, an FM antenna matching circuit is used for matching the power between a mobile phone mainboard and an FM antenna, so that the FM signal can be better received by an FM chip circuit, and the FM receiving performance can be improved.

When the FM function is needed to be realized, the earphone is inserted into the earphone interface, two points on the earphone head are connected with the points of the earphone interface to form a signal path, when an audio signal is received, an FM receiving signal is sent to the processor, so that equipment providing the FM function is started, such as a driving chip of a radio, the radio driving chip works to receive the audio, and meanwhile, the radio frequency is different from the frequency of an earphone circuit, so that an earphone wire can be shared.

The typical earphone wire has three or more wires, left and right channel signals output by a radio chip are connected to left and right channel audio wires of the earphone after being driven by an earphone power amplifier, and a public audio wire of the earphone can be used as an audio return path and an FM antenna. Other wires in the headset may be used for Microphone (MIC) audio, switching, or other functions. In some applications, the FM antenna is a separate conductor in the cable.

It should be noted that, for the TYPE C TYPE earphone interface, the FM antenna has the following two cases. When the FM radio function is started, the FM antenna is a wire body of the wired earphone connected to the earphone interface and the earphone interface connected with the wired earphone, and the FM antenna is different for different earphones.

The first condition is as follows: what insert TYPE C earphone interface is the earphone of TYPE C interface.

When starting FM radio reception function, the FM antenna is for being connected to the line body and the TYPE C earphone interface of the earphone of the TYPE C interface of earphone interface, utilizes the line body of the earphone of TYPE C earphone interface and TYPE C interface to realize FM antenna function jointly.

Case two: what insert TYPE C earphone interface is ordinary 3.5 mm's earphone.

And indirectly connecting the earphone with the TYPE C earphone interface to form an FM antenna.

Ordinary 3.5 mm's earphone and TYPE C earphone interface are unmatched, can't realize FM antenna function, can utilize a conversion line to link to each other ordinary 3.5 mm's earphone and TYPE C earphone interface, indirectly realize the connection of earphone and TYPE C earphone interface, so when starting FM radio reception function, the line body and the TYPE C earphone interface of the earphone of FM antenna for ordinary 3.5mm, can realize FM antenna function equally.

The mobile phone receives a digital signal, and the FM antenna can receive and transmit an analog signal to the circuit board, so that a digital-to-analog conversion process is required, so that the mobile phone can receive the signal and realize the effect of FM listening to audio, and the digital-to-analog conversion part may be included in the processing chip or the radio frequency chip, which is not limited herein. The received FM signals are converted into digital modulation signals suitable for channel transmission through the processing chip, and the digital modulation signals are transmitted to the main body of the earphone through the earphone wire body connected to the earphone interface and output. Still be equipped with the matching device between FM antenna and the circuit mainboard, including inductance or electric capacity for form the paratype matching circuit, this inductance is established ties between built-in FM antenna and circuit mainboard, forms the paratype circuit through the matching device, can make impedance match between built-in FM antenna and mobile terminal's the circuit mainboard from this.

The above-mentioned ground is usually a ground line or a 0 line on a circuit diagram or a circuit board, and also means a common terminal, and is not a true ground.

Through the embodiment of the disclosure, due to the adoption of the mode of combining the earphone interface with the FM processing circuit matched with the earphone interface, when the FM function is required to be realized, the FM function can be realized by directly or indirectly inserting the earphone, the technical problem that the FM antenna function can not be realized based on the earphone seat and the common earphone wire for the mobile terminal equipment configured with the C-type interface in the related technology is at least partially overcome, and the technical effect of realizing the FM function for the mobile terminal equipment configured with the C-type interface is further realized.

Fig. 2A schematically shows a schematic view of an electronic device according to another embodiment of the present disclosure.

As shown in fig. 2A, the electronic device 100 may further include an audio codec chip 106.

The audio decoding chip 106 is configured to obtain an audio signal through a connection channel with the FM processing circuit, and transmit the audio signal to a line body passing through the earphone through a connection channel with left and right channels of the earphone interface to output the audio signal.

According to the embodiment of the present disclosure, the audio codec chip 106 is connected to the left and right channels of the headphone interface. The FM radio audio signal is required to be recoded and decoded to form an audio signal suitable for the listening range of the earphone because the frequency of the FM radio audio signal is different from that of the earphone circuit, specifically, the FM radio audio signal processed by the processing chip is received first, then decoded, and recoded to form an audio signal suitable for channel transmission, that is, the audio signal obtained from the FM processing circuit can be transmitted and output through the connection channels of the left and right channels of the earphone interface to realize the audio reception function.

Through the embodiment of the disclosure, due to the adoption of the mode of reprocessing the FM radio station audio signals through the audio coding and decoding chip, the electronic equipment can transmit the audio signals to the line body passing through the earphone through the connecting channel of the left and right sound channels of the earphone interface so as to output the audio signals when the FM function is required to be realized, and the audio reception effect is improved.

Fig. 2B schematically shows a schematic view of an electronic device according to another embodiment of the present disclosure.

As shown in fig. 2B, the earphone interface of the electronic device 100 is a TYPE C interface, and the electronic device may further include a MOSFET switch 107.

According to the embodiment of the disclosure, the MOSFET is arranged on a connecting channel between an FM processing circuit and a ground of an earphone interface, so that the ground wire of the earphone serves as an FM antenna to reduce loss and noise of an FM receiving signal, and is used as an FM antenna, and when a TYPE C interface is inserted in a positive direction and a negative direction, an FM antenna channel is always connected with the ground wire of TYPE C.

The processing chip is used for controlling the MOSFET switch to enable the FM processing circuit to be conducted with the ground connection channel of the earphone interface when the FM function of the electronic equipment is enabled.

According to the embodiment of the disclosure, a simple low-loss low-noise two-terminal MOSFET switch 107 can be adopted to control the normal switching of MIC and GND through a GPIO port while using the earphone ground corresponding to TYPE C as an FM antenna. The GPIO may be a logic control circuit that controls the conduction of MIC1 and MIC2 when high, and GND1 and GND2 when low.

Through this disclosed embodiment, owing to adopt the MOSFET switch, control FM processing circuit switches on with earphone interface's ground interface channel, solves the problem of conventional TYPE C's FM processing circuit and earphone interface's tow sides switching, realizes reducing FM received signal loss and noise, guarantees simultaneously that the FM antenna utilizes the ground wire as the FM antenna, when TYPE C is positive and negative to be inserted, guarantees the technological effect that FM antenna passageway is connected with TYPE C's ground wire all the time.

According to the embodiment of the disclosure, the MOSFET switch is also located on a connection channel of the MIC of the audio codec chip and the earphone interface. The baseband processing chip carries out corresponding switching action through GPIO logical control MIC and the positive and negative condition of inserting of ground wire following TYPE C, guarantees that the FM antenna is connected to TYPE C's ground wire all the time on, guarantees the reliable correct connection of FM antenna.

Because TYPE C has just inserting and the problem of inserting backward, and just insert with when inserting backward, correspond different earphone sound channels, there may exist and receive audio signal and have the difference, lead to the technical problem that audio frequency receiving effect is not good, consequently need solve because TYPE C just insert with the anti puzzlement that brings of inserting, according to the electronic equipment that this disclosure provided, can go to control MIC and ground wire through logic circuit and carry out corresponding switching action along with TYPE C's positive and negative condition of inserting, avoided above-mentioned problem.

Through this disclosed embodiment, owing to adopt the MOSFET switch, GPIO logic control MIC terminal and ground wire follow TYPE C's positive and negative condition of inserting and carry out corresponding switching action, when guaranteeing that the FM antenna is connected to TYPE C's ground wire all the time, have also guaranteed the reliable correct connection of FM antenna.

According to the embodiment of the disclosure, the problem of FM signal attenuation caused by direct grounding of the MIC terminal and GND of a conventional TYPE C multimedia switch is solved by using the left channel or the right channel of the earphone corresponding to TYPE C as an FM antenna. Specifically, after an earphone interface of the electronic equipment is connected with an earphone, whether the earphone is inserted in a front insertion mode or a back insertion mode is detected; if the earphone is detected to be inserted in a front insertion mode, the multimedia change-over switch is kept still, otherwise, the multimedia change-over switch is used for switching the left sound channel and the right sound channel; or if the earphone is inserted in a reverse insertion mode, keeping the multimedia switch still, otherwise, switching the left channel and the right channel by using the multimedia switch. As described above, the left channel and the right channel may be switched according to the manner in which the earphone is inserted into the earphone interface, so that the audio signal that is encoded and decoded by the audio encoding and decoding module can be normally output from the earphone interface.

Fig. 2C schematically shows a schematic view of an electronic device according to another embodiment of the present disclosure.

As shown in fig. 2C, the electronic device 100 further includes a switch 108.

And the change-over switch 108 is arranged between the audio coding and decoding chip and the connecting channels of the left and right sound channels of the earphone interface, and is used for matching the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface and matching the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface reversely.

The earphone wire generally has three or more wires, the left and right sound channel signals output by the radio chip are connected to the left and right sound channel audio wires of the earphone after being driven by the earphone power amplifier, and the public audio wire of the earphone can be used as an audio return path and an FM antenna. Other wires in the headset may be used for microphone audio, switching, or other functions.

When the joint of earphone is inserting the earphone interface, TYPE C's the left and right sound channel has realized the matching with the left and right sound channel of earphone, when the joint of earphone is anti-inserting the earphone interface, utilizes change over switch 108, can switch TYPE C's the left and right sound channel for TYPE C's the left and right sound channel with the earphone realizes the matching, and can not because the positive and negative of earphone joint is inserted, the audio frequency reception effect that leads to is not good.

Through this disclosed embodiment, through utilizing change over switch, realize controlling the switching of sound channel for TYPE C controls the sound channel and the earphone control the sound channel and realizes matcing, and can not insert because earphone joint's positive and negative, and the audio frequency receiving effect that leads to is not good, and can reach no matter the earphone interface is inserting or is inserting the effect that can all realize high-quality audio frequency and receive backward.

As shown in fig. 3, the FM broadcasting method may include operations S310 to S320, in which:

in operation S310, it is determined whether a wired headset is connected through a headset interface of the electronic device.

In operation S320, an FM processing circuit connected to a ground connection point of the earphone interface on the electronic device is enabled in response to a trigger instruction of FM broadcasting based on result information that the wired earphone is connected to the earphone interface, and the FM processing circuit receives a band signal of FM based on a wire of the wired earphone, where the wire of the wired earphone and a connection interface when the wired earphone is connected are used as an FM antenna together.

According to the embodiment of the disclosure, the electronic equipment comprises an audio encoding and decoding chip, wherein the decoding chip is connected with an FM processing circuit; and the method further comprises: the audio decoding chip is used for obtaining audio signals through a connecting channel of the FM processing circuit and transmitting the audio signals to a wire body passing through the earphone through a connecting channel of a left sound channel and a right sound channel of the earphone interface so as to output the audio signals.

According to an embodiment of the present disclosure, the electronic device further comprises a MOSFET switch; and the method further comprises: the loss and noise of FM receiving signals are reduced through the MOSFET switch arranged on the connecting channel of the FM processing circuit and the ground of the earphone interface, and meanwhile, the FM antenna is ensured to use the ground wire as the FM antenna, and when TYPE C is inserted positively and negatively, the FM antenna channel is ensured to be connected with the ground wire of TYPE all the time; and the processing chip is used for controlling the MOSFET switch to enable the FM processing circuit to be conducted with the ground connection channel of the earphone interface when the FM function of the electronic method is enabled.

According to an embodiment of the disclosure, the method further comprises: make baseband processing chip follow TYPE C's positive and negative condition of inserting through GPIO logic control MIC and ground wire and carry out corresponding switching action, guarantee that the FM antenna is connected to TYPE C's ground wire all the time on, guarantee the reliable correct connection of FM antenna.

Through this disclosed embodiment, owing to adopt the MOSFET switch, GPIO logic control MIC and ground wire follow TYPE C's positive and negative condition of inserting carry out corresponding switching action, when guaranteeing that the FM antenna is connected to TYPE C's ground wire all the time, have also guaranteed the reliable correct connection of FM antenna.

According to the embodiment of the disclosure, the electronic device further comprises a change-over switch arranged between the audio coding and decoding chip and the connecting channels of the left and right sound channels of the earphone interface; and the method further comprises: the left and right sound channels are matched with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface by the change-over switch, and the left and right sound channels are matched with the left and right sound channels of the earphone when the connector of the earphone is reversely inserted into the earphone interface.

It should be noted that the FM playing method in the embodiment of the present disclosure corresponds to the electronic device, and for the description of the display method, reference may be made to the description of the electronic device according to the embodiment of the present disclosure, and details are not repeated here.

Those skilled in the art will appreciate that various combinations and/or combinations of features recited in the various embodiments and/or claims of the present disclosure can be made, even if such combinations or combinations are not expressly recited in the present disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.

While the disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Accordingly, the scope of the present disclosure should not be limited to the embodiments, but should be defined not only by the appended claims, but also by equivalents thereof.

Claims

1. An electronic device, the electronic device comprising:

the earphone interface is a TYPE C interface and is used for connecting a wired earphone;

an FM processing circuit connected to a first ground connection point of the headset interface, the FM processing circuit comprising:

a suppression circuit connected to the first ground connection point of the headset interface, the suppression circuit including a second ground connection point for connection to a ground of the electronic device, the suppression circuit for preventing attenuation of FM band signals obtained by an FM antenna;

the FM antenna matching circuit is connected with the first ground connection point of the earphone interface and is used for realizing power matching between the electronic equipment and the FM antenna;

the FM receiving chip is connected with the FM antenna matching circuit and used for receiving band signals transmitted by an FM radio station through an FM antenna;

the processing chip is connected with the FM receiving chip and used for converting the FM waveband signal into an audio signal and transmitting the audio signal to the main body of the earphone through the wire body of the wired earphone for output;

the MOSFET switch is arranged on a connecting channel between the FM processing circuit and the ground of the earphone interface and is used for reducing FM receiving signal loss and noise, enabling the earphone ground wire to be used as an FM antenna and ensuring that an FM antenna channel is always connected with the ground wire of TYPE C when the TYPE C interface is inserted in a positive and negative mode;

the processing chip is used for controlling the MOSFET switch to enable the FM processing circuit to be conducted with a ground connection channel of the earphone interface when the FM function of the electronic equipment is enabled;

the FM antenna is connected to the wire body of the wired earphone of the earphone interface and the earphone interface of the wired earphone.

2. The electronic device of claim 1, wherein the electronic device further comprises:

and the audio coding and decoding chip is used for obtaining the audio signal through a connecting channel of the FM processing circuit and transmitting the audio signal to a wire body passing through the earphone through a connecting channel of a left sound channel and a right sound channel of the earphone interface so as to output the audio signal.

3. The electronic device of claim 2, wherein the MOSFET switch is further located on a connection channel of the audio codec chip and the MIC terminal of the headphone interface;

the processing chip carries out corresponding switching action through GPIO logic control MIC and the positive and negative condition of inserting of ground wire following TYPE C, guarantees that the FM antenna is connected to TYPE C's ground wire all the time for the reliable correct connection of FM antenna.

4. The electronic device of claim 2, wherein the electronic device further comprises:

the switching switch is arranged between the audio coding and decoding chip and the connecting channels of the left and right sound channels of the earphone interface and is used for matching the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface and matching the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is reversely inserted into the earphone interface.

5. A method of implementing FM playback, the method comprising:

determining whether a wired earphone is connected or not through an earphone interface of the electronic equipment, wherein the earphone interface is a TYPE C interface;

responding to a trigger instruction of FM playing based on result information that a wired earphone is connected with the earphone interface, enabling an FM processing circuit connected with a ground connection point of the earphone interface on the electronic equipment, and enabling the FM processing circuit to receive an FM waveband signal based on a wire body of the wired earphone, wherein the wire body of the wired earphone and the connection interface when the wired earphone is connected are jointly used as an FM antenna;

wherein the content of the first and second substances,

the electronic equipment further comprises a MOSFET switch and a processing chip;

the method further comprises the following steps:

the FM receiving signal loss and noise are reduced through the MOSFET switch arranged on the connecting channel between the FM processing circuit and the ground of the earphone interface, the ground wire of the earphone is used as an FM antenna, and when the TYPE C interface is inserted positively and negatively, the FM antenna channel is always connected with the TYPE C ground wire; and

the processing chip is used for controlling the MOSFET switch to enable the FM processing circuit to be conducted with a ground connection channel of the earphone interface when the FM function of the electronic equipment is enabled.

6. The method of claim 5, wherein:

the electronic equipment comprises an audio coding and decoding chip, wherein the audio coding and decoding chip is connected with the FM processing circuit; and

the method further comprises the following steps:

and the audio coding and decoding chip is used for obtaining audio signals through a connecting channel of the FM processing circuit and transmitting the audio signals to a wire body passing through the earphone through a connecting channel of a left sound channel and a right sound channel of the earphone interface so as to output the audio signals.

7. The method of claim 5, wherein the method further comprises:

make the processing chip follows TYPE C's positive and negative circumstances of inserting through GPIO logic control MIC terminal and ground wire and carries out corresponding switching action, guarantees that the FM antenna is connected to TYPE C's ground wire all the time on, guarantees the reliable correct connection of FM antenna.

8. The method of claim 6, wherein:

the electronic equipment also comprises a change-over switch which is arranged between the audio coding and decoding chip and a connecting channel of the left sound channel and the right sound channel of the earphone interface; and

the method further comprises the following steps:

and enabling a change-over switch to match the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is inserted into the earphone interface, and to match the left and right sound channels with the left and right sound channels of the earphone when the connector of the earphone is reversely inserted into the earphone interface.