CN117498974A

CN117498974A - Terminal equipment, peripheral equipment and terminal system

Info

Publication number: CN117498974A
Application number: CN202311830698.5A
Authority: CN
Inventors: 温玉磊; 童尉; 马柏杰
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2023-12-28
Filing date: 2023-12-28
Publication date: 2024-02-02
Anticipated expiration: 2043-12-28
Also published as: CN117498974B

Abstract

The application provides a terminal device, a peripheral device and a terminal system, wherein the terminal device comprises a circuit board, an FM demodulator and a playing unit; the circuit board is provided with at least one metal wire and a first metal ground, wherein one metal wire and/or the first metal ground is/are used for forming an FM built-in antenna to receive FM signals; the FM demodulator is connected with the FM built-in antenna and the playing unit, and is used for demodulating the FM signal received by the FM built-in antenna into an audio signal and sending the audio signal to the playing unit for playing. Therefore, even if no external earphone is connected, the terminal equipment can also form an FM built-in antenna through one of the metal wires and/or the first metal ground in the terminal equipment to receive FM signals, and further the FM radio function can be used, so that the terminal equipment does not need to be connected with an FM antenna independent of the terminal equipment, and the FM radio function can also be used.

Description

Terminal equipment, peripheral equipment and terminal system

Technical Field

The application relates to the technical field of FM radio, in particular to terminal equipment, peripheral equipment and a terminal system.

Background

At present, most manufacturers usually choose to castrate the FM radio function when designing terminal devices such as mobile phones and tablet computers, and a small part of terminal devices such as mobile phones and tablet computers without cutting off the FM radio function usually use external headphones as an FM receiving antenna, but this means that if users want to use the FM radio function, they have to wear headphones, and when users forget to take the headphones or do not want to wear the headphones, they cannot use the FM radio function.

Disclosure of Invention

To this end, the present application provides a terminal device, a peripheral device, and a terminal system, which can use an FM radio function without connecting an FM antenna independent of the terminal device.

The first aspect of the application provides a terminal device, which comprises a circuit board, an FM demodulator and a playing unit; the circuit board is provided with at least one metal wire and a first metal ground, wherein one metal wire and/or the first metal ground is/are used for forming an FM built-in antenna to receive FM signals; the FM demodulator is connected with the playing unit of the FM built-in antenna, and is used for demodulating the FM signal received by the FM built-in antenna into an audio signal and sending the audio signal to the playing unit for playing. Thus, the terminal device does not need to be connected with an FM antenna independent of the terminal device, and can receive FM signals by forming an FM built-in antenna through one of the metal wires and/or the first metal ground inside the terminal device so as to use an FM radio function.

In one possible embodiment, the at least one metal trace includes a ground line, a power line, and a signal transmission line. Thus, the FM internal antenna may be formed by the ground line and/or the first metal ground, or the power line, or the signal transmission line to receive the FM signal, and the formed FM internal antenna having a length most suitable for receiving the FM signal may be selected according to the length of the ground line, the area of the first metal ground, the length of the power line, and the length of the signal transmission line, so that the receiving effect is better.

In a possible implementation manner, the ground wire and the first metal ground are used for forming an FM internal antenna to receive FM signals. For the terminal equipment with smaller volume and basically the same length of the ground wire, the length of the power wire and the length of the signal transmission wire, the total length of the ground wire and the first metal ground is closer to the length of the optimal receiving antenna of the FM signal, so that the effect that the ground wire and the first metal ground form the FM built-in antenna to receive the FM signal is better.

In a possible implementation manner, the terminal device further includes a first pass FM filter and a blocking FM filter, where the first pass FM filter is disposed between the FM internal antenna and the FM demodulator, and the blocking FM filter is disposed on a line where other metal wires that do not form the FM internal antenna are located. Therefore, FM signals can be prevented from being transmitted to other components through the circuit where the metal wiring of the FM built-in antenna is not formed, and all FM signals can be transmitted to the FM demodulator through the circuit where the FM built-in antenna is formed, so that energy loss is reduced.

In a possible implementation manner, the terminal device further includes a signal amplifier, where the signal amplifier is connected between the FM internal antenna and the FM demodulator, and the signal amplifier is configured to amplify the FM signal received by the FM internal antenna and send the FM signal to the FM demodulator. Therefore, the FM signal intensity entering the FM demodulator is stronger, the quality is better, and the FM signal is clearer and more stable.

In a possible implementation manner, the terminal device further includes a first connection portion, where the first connection portion is configured to connect with a second connection portion of a peripheral device to access the peripheral device, and when the first connection portion of the terminal device is connected with the second connection portion of the peripheral device, at least part of structures in the peripheral device are configured to form an FM extension antenna of the terminal device, where the FM extension antenna and the FM internal antenna are connected to form an FM combined antenna together to receive FM signals. Therefore, for the terminal equipment with smaller volume, the FM built-in antenna and the FM epitaxial antenna of the peripheral equipment in the terminal equipment are used as the FM combined antenna together, so that the overall antenna length for receiving the FM signals can be effectively increased, the length of the FM combined antenna is closer to the optimal receiving antenna length of the FM signals, and further the receiving effect of the FM signals is better.

In a possible implementation manner, the first connection part comprises at least one first electric connection piece, the at least one first electric connection piece is respectively connected with at least one metal wire in the terminal equipment in a one-to-one correspondence manner, the peripheral equipment comprises a second metal ground and at least one metal wire corresponding to the at least one metal wire in the terminal equipment, the second connection part comprises at least one second electric connection piece, and the at least one second electric connection piece is respectively connected with the at least one metal wire in the peripheral equipment in a one-to-one correspondence manner; when the first connection part of the terminal equipment is connected with the second connection part of the peripheral equipment, the at least one metal wire in the peripheral equipment is connected with the at least one metal wire in the terminal equipment in a one-to-one correspondence mode, a second metal ground in the peripheral equipment and/or one target metal wire in the peripheral equipment form an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna and the FM built-in antenna are connected to be jointly used as an FM combined antenna to receive FM signals, wherein the target metal wires are metal wires corresponding to the metal wires forming the FM built-in antenna in the terminal equipment. Therefore, for the terminal equipment with smaller volume, when the peripheral equipment is connected with the terminal equipment, the metal wiring corresponding to the metal wiring forming the FM built-in antenna in the terminal equipment in the peripheral equipment and the FM built-in antenna jointly form the FM combined antenna to receive the FM signal, so that the length of the antenna for receiving the FM signal is longer, the antenna is closer to the optimal receiving antenna length of the FM signal, and the receiving effect of the FM signal is better.

In a possible embodiment, the first connection portion and the second connection portion are detachably connected. Thus, the terminal device and the peripheral device can be separated, thereby allowing the terminal device to be connected with different peripheral devices through the first connection part, and correspondingly, the peripheral device can also be connected with different terminal devices through the second connection part.

In a possible embodiment, the first connection portion is a popin connector, and the second connection portion is also a popin connector. Therefore, when the first connecting part is connected with the second connecting part, the two POGPIN connectors are contacted, and the use is simple and convenient.

In a possible implementation manner, the terminal device further includes an earphone port, and the earphone port is connected with the FM demodulator and is used for being connected to an earphone, where when the earphone port is connected to the earphone, at least part of the structure of the earphone is used for forming an FM external antenna to receive FM signals. Therefore, the FM external antenna of the terminal equipment can also be formed through at least part of the structure of the earphone so as to receive FM signals.

In a possible implementation manner, the terminal device further includes a switch unit for selectively connecting the FM demodulator to one of the FM internal antenna and the earphone port. Accordingly, the FM internal antenna or the FM external antenna can be selected to be connected to the FM demodulator, and the FM signal received from the FM internal antenna or the FM external antenna can be selected to be transmitted to the FM demodulator, so that the FM internal antenna or the FM external antenna can be selected to be used as required.

In a possible implementation manner, when the earphone port is connected to an earphone, the switch unit selectively connects the FM demodulator to the earphone port, so that the FM demodulator is electrically connected to the earphone, and demodulates an FM signal received by the FM external antenna into an audio signal; the switch unit selectively connects the FM demodulator to the FM internal antenna when the earphone port is not connected with the earphone, so that the FM demodulator demodulates the FM signal received by the FM internal antenna into an audio signal. For the terminal device with smaller volume, the length of the FM external antenna is generally longer than that of the FM internal antenna, so that the FM signal receiving effect is better, when the earphone port is connected to the earphone, the FM signal received by the FM external antenna is transmitted to the FM demodulator by default, and when the earphone port is not connected to the earphone, the FM signal received by the FM internal antenna is transmitted to the FM demodulator by default, so that the audio signal quality obtained by demodulation of the FM demodulator is higher.

In a possible implementation manner, the switch unit comprises a single-pole single-throw switch, the single-pole single-throw switch is connected between the FM built-in antenna and the FM demodulator, and when the earphone port is connected with an earphone, the single-pole single-throw switch is disconnected; when the earphone port is not connected with the earphone, the single-pole single-throw switch is closed; or, the switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch is connected among the FM built-in antenna, the earphone port and the FM demodulator, and when the earphone port is connected with an earphone, the single-pole double-throw switch electrically connects the earphone port with the FM demodulator; when the earphone port is not connected with the earphone, the single-pole double-throw switch electrically connects the FM internal antenna with the FM demodulator. Therefore, when the earphone port is connected with the earphone, the FM demodulator is connected with the FM built-in antenna when the earphone port is not connected with the earphone, and the structure is simple.

In a possible implementation manner, the terminal device further includes a detection module, where the detection module is connected to the FM demodulator, and the detection module is configured to detect a quality of an FM signal received by the FM internal antenna and a quality of an FM signal received by the FM external antenna by detecting an audio signal demodulated and output by the FM demodulator; the switch unit is used for selectively connecting the FM demodulator to the FM internal antenna or the earphone port according to the quality of the FM signal received by the FM internal antenna and the quality of the FM signal received by the FM external antenna detected by the detection module. Therefore, the detection module can be used for detecting the quality of FM signals received by the FM internal antenna and the FM external antenna, and the FM internal antenna or the FM external antenna with better signal quality can be selected to receive the FM signals, so that the communication performance can be effectively improved.

In a possible implementation manner, the switch unit selects to connect the FM demodulator to the FM internal antenna when the quality of the FM signal received by the FM internal antenna is higher than the quality of the FM signal received by the FM external antenna; and selecting to connect the FM demodulator to the earphone port when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna. Therefore, the FM signals transmitted to the FM demodulator can be the FM signals with higher quality in the FM signals received by the FM internal antenna and the FM signals received by the FM external antenna.

In a possible implementation manner, the switch unit includes a first single-pole single-throw switch and a second single-pole single-throw switch, the first single-pole single-throw switch is connected between the FM internal antenna and the FM demodulator, the second single-pole single-throw switch is connected between the earphone port and the FM demodulator, and when the quality of an FM signal received by the FM internal antenna is higher than that of an FM signal received by the FM external antenna, the first single-pole single-throw switch is closed, and the second single-pole single-throw switch is opened; when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna, the first single-pole single-throw switch is opened, and the second single-pole single-throw switch is closed; or the switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch is connected among the FM demodulator, the FM internal antenna and the earphone port, and when the quality of an FM signal received by the FM internal antenna is higher than that of an FM signal received by the FM external antenna, the single-pole double-throw switch electrically connects the FM internal antenna with the FM demodulator; and when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna, the single-pole double-throw switch electrically connects the earphone port with the FM demodulator. Therefore, when the switch unit comprises a first single-pole single-throw switch and a second single-pole single-throw switch, the FM signals with higher quality in the FM signals received by the FM internal antenna and the FM signals received by the FM external antenna are transmitted to the FM demodulator through the first single-pole single-throw switch and the second single-pole single-throw switch; when the switch unit comprises a single-pole double-throw switch, the FM signals received by the FM internal antenna and the FM signals received by the FM external antenna are transmitted to the FM demodulator through the single-pole double-throw switch, and the structure is simple.

In a possible implementation manner, the playing unit includes an audio power amplifier and an audio output piece, the audio power amplifier is connected with the FM demodulator and the audio output piece, the audio power amplifier is used for amplifying the power of the audio signal obtained by demodulation of the FM demodulator, and the audio output piece is used for outputting audio. Therefore, the audio output by the audio output piece is smaller in distortion and better in quality.

The second aspect of the present application provides a peripheral device, including a second connection portion, the second connection portion is used for being connected with the first connection portion of the aforementioned terminal device, when the second connection portion of the peripheral device is connected with the first connection portion of the terminal device, at least part of structures in the peripheral device are used for forming an FM extension antenna of the terminal device, and the FM extension antenna is connected with an FM internal antenna to jointly form an FM combination antenna to receive FM signals. Therefore, when the peripheral equipment is connected with the terminal equipment with smaller volume, the FM epitaxial antenna of the peripheral equipment and the FM internal antenna of the terminal equipment jointly form the FM combined antenna, so that the length of the FM combined antenna is closer to the length of the FM signal optimal receiving antenna, and further the receiving effect of the FM signal is better.

In a possible implementation manner, the peripheral equipment comprises a second metal ground and at least one metal wire corresponding to the at least one metal wire in the terminal equipment, the second connection part comprises at least one second electric connection piece, and the at least one second electric connection piece is respectively connected with the at least one metal wire in the peripheral equipment in a one-to-one correspondence manner; when the second connection part of the peripheral equipment is connected with the first connection part of the terminal equipment, the at least one metal wire in the peripheral equipment is connected with the at least one metal wire in the terminal equipment in a one-to-one correspondence manner, at least the second metal ground in the peripheral equipment and/or one target metal wire in the peripheral equipment form an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna is connected with an FM built-in antenna of the terminal equipment to jointly form an FM combined antenna so as to receive FM signals; the target metal wire is a metal wire corresponding to the metal wire forming the FM built-in antenna in the terminal equipment, and the first connecting part comprises at least one first electric connecting piece which is respectively connected with at least one metal wire in the terminal equipment in a one-to-one correspondence manner. Therefore, when the second connection part of the peripheral equipment is connected with the first connection part of the terminal equipment, the metal wiring corresponding to the metal wiring forming the FM built-in antenna in the terminal equipment and/or the second metal ground and the FM built-in antenna form the FM combined antenna together to receive the FM signal in the peripheral equipment, and for the terminal equipment with smaller volume, the length of the antenna for receiving the FM signal is longer and is closer to the length of the optimal receiving antenna of the FM signal, and the receiving effect of the FM signal is better.

In a possible implementation manner, the FM internal antenna in the terminal device is formed by the first metal ground and a ground wire of the terminal device, the peripheral device further comprises a bluetooth antenna and a second through FM filter, the second through FM filter is connected between the bluetooth antenna and the second metal ground of the peripheral device, the ground wire of the peripheral device and the bluetooth antenna form the FM external antenna, and when the peripheral device is connected with the terminal device, the FM external antenna in the peripheral device and the FM internal antenna in the terminal device jointly form the FM combined antenna. Therefore, when the peripheral equipment is connected with the peripheral equipment, the Bluetooth antenna, the metal ground of the peripheral equipment, the ground wire of the peripheral equipment and the FM built-in antenna in the terminal equipment jointly form the FM combined antenna, so that the antenna length for receiving FM signals of the terminal equipment with smaller volume is longer and is closer to the optimal receiving antenna length of the FM signals, and the receiving effect of the FM signals is better.

In a possible implementation manner, the peripheral device is a keyboard. Because the keyboard is provided with the longer at least one metal wire and the second metal ground, when the keyboard is used as the peripheral equipment and is connected with the terminal equipment with smaller volume, the metal wire corresponding to the metal wire forming the FM built-in antenna in the terminal equipment in the keyboard and the FM built-in antenna jointly form the FM combined antenna to receive the FM signal, so that the length of the antenna for receiving the FM signal is longer, the antenna is closer to the optimal receiving antenna length of the FM signal, and the receiving effect of the FM signal is better.

A third aspect of the present application provides a terminal system, including the foregoing terminal device and the foregoing peripheral device. Therefore, when the earphone which can affect the hearing is not worn for a long time to receive the FM signal, the terminal equipment can be connected with the peripheral equipment to form the FM combined antenna together with the FM built-in antenna through the metal wiring which corresponds to the metal wiring which forms the FM built-in antenna in the terminal equipment in the peripheral equipment so as to receive the FM signal, so that the length of the antenna for receiving the FM signal is longer and is closer to the optimal receiving antenna length of the FM signal, and the receiving effect of the FM signal is better.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a terminal system according to some embodiments of the present application;

fig. 2 is a block diagram of a circuit structure of a terminal device according to some embodiments of the present application;

Fig. 3 is a schematic structural diagram of a terminal device at a first view angle according to some embodiments of the present application;

fig. 4 is a schematic structural diagram of a terminal device at a second view angle according to some embodiments of the present application;

fig. 5 is a block diagram of a circuit structure of a peripheral device according to some embodiments of the present application;

fig. 6 is a block diagram of a circuit structure of a terminal device and an earphone according to some embodiments of the present application;

fig. 7 is a block diagram of a circuit structure of a terminal device and an earphone according to other embodiments of the present application;

fig. 8 is a block diagram of a circuit structure of a terminal device and an earphone according to further embodiments of the present application;

fig. 9 is a block diagram of a circuit structure of a terminal device and an earphone according to still other embodiments of the present application;

fig. 10 is a block diagram of a circuit structure of a terminal device according to other embodiments of the present application;

fig. 11 is a block diagram of a circuit structure of a terminal device according to still other embodiments of the present application.

Detailed Description

Embodiments of the present application are described below with reference to the accompanying drawings.

As shown in fig. 1, in some embodiments, the terminal system 1000 includes a terminal device 100 and a peripheral device 200. Wherein the terminal device 100 may be connected to the peripheral device 200, and the peripheral device 200 may serve as an external device to the terminal device 100 to provide an auxiliary extension function for the terminal device 100, or may also act on the terminal device 100, and so on.

The terminal device 100 is a portable terminal device having an input/output function, a two-way communication function, and the like, for example, but not limited to, a tablet, a notebook, a mobile phone, a watch, and the like, and the peripheral device 200 may be, but not limited to, a keyboard, a display, a charger, and the like.

As shown in fig. 2, in some embodiments, the terminal device 100 includes a first circuit board 10, an FM demodulator 11, and a playback unit 12. The first circuit board 10 is provided with at least one first metal trace 101 and a first metal ground 102, wherein one first metal trace (GND 1, vcc1 or Data 1) and/or the first metal ground 102 is used for forming an FM internal antenna 103 to receive FM signals. The FM demodulator 11 is connected to the FM internal antenna 103 and the playing unit 12, and the FM demodulator 11 is configured to demodulate an FM signal received by the FM internal antenna 103 into an audio signal, and send the audio signal to the playing unit 12 for playing.

Thus, the terminal device 100 does not need to connect an FM antenna independent of the terminal device 100, and can receive an FM signal by forming an FM built-in antenna 103 through one of the first metal wirings (GND 1, vcc1, or Data 1) and/or the first metal ground 102 inside itself, thereby enabling the use of an FM radio function.

Wherein the frequency range of the FM signal is generally 88-108 megahertz (MHz), the antenna efficiency is highest when the antenna size is generally 1/4 of the wavelength corresponding to the received FM signal, and the wavelength corresponding to the FM signal is the propagation speed/frequency of the FM signal, and the propagation speed of the FM signal is the light speed, therefore, according to the theoretical optimal antenna length calculation formula, the antenna length (in meters) =light speed/(frequency×4), wherein the light speed is about 3×10 ⁸ Therefore, the optimal antenna length for FM signal theory is about 0.7 to 0.85 meters. It should be noted that this is only the theoretical optimal antenna length, and in practical applications the FM receiving antenna length is even smaller than the optimal antenna length, so long as it is not too small, to meet the FM signal receiving efficiency requirements.

In this application, when the volume of the terminal device 100 is large, the FM internal antenna 103 is formed by one of the first metal traces (GND 1, vcc1 or Data 1) and/or the first metal ground 102 to receive FM signals, and since the traces GND1, vcc1 or Data1 extend from the connection interface to the position of the internal motherboard in the terminal device 100, the traces tend to extend longer, in particular, the first metal ground 102 on the first circuit board 10 is generally larger, so that the equivalent electrical length will be longer, and therefore, the receiving efficiency requirement of FM signals can be satisfied.

Wherein the FM demodulator is a device or circuit for demodulating Frequency Modulated (FM) signals. In general, information to be transmitted is carried on a carrier wave, an FM signal is generated after modulation of the carrier wave, and the FM demodulator has a main function of recovering the FM modulated signal into an original baseband signal to obtain information carried on the carrier wave, specifically, recovering the FM modulated signal into the original baseband signal through a specific demodulation algorithm or circuit to obtain information carried on the carrier wave. Further, the FM demodulator may further include a filter for removing noise and unwanted frequency components from the demodulated signal.

The material of the at least one first metal trace 101 and the first metal land 102 may be a metal material with good conductivity such as copper and/or aluminum.

In some embodiments, as shown in fig. 3 and fig. 4, the terminal device 100 further includes a housing 13 and a display screen 14, and the first circuit board 10, the FM demodulator 11, and the playing unit 12 are all disposed in an internal cavity formed by connecting the housing 13 and the display screen 14. Thus, the external appearance of the terminal device 100 can be made more beautiful. In some embodiments, the display 14 may be a touch screen, and in particular, may be a resistive touch screen, a capacitive touch screen, a surface acoustic wave touch screen, or the like. In other embodiments, the display 14 may be a non-touch display.

The first circuit board 10 may be a flexible circuit board (FPC), a rigid circuit board (PCB), or a flexible circuit board in one part and a rigid circuit board in another part.

As shown in fig. 2, in some embodiments, the first circuit board 10 includes a first flexible circuit board 104 and a first main board 105, where the first main board 105 is a rigid circuit board, the first flexible circuit board 104 and the first main board 105 are located in an internal cavity formed by connecting the housing 13 and the display screen 14, the first flexible circuit board 104 is connected with the first main board 105, and the FM demodulator 11 and at least part of the playing unit 12 are disposed on the first main board 105.

As shown in fig. 2, most of each of the at least one first metal trace 101 is disposed on the first flexible circuit board 104, and some of each of the at least one first metal trace 101 is disposed on the first motherboard 105 in an extending manner and is connected to a corresponding component on the first motherboard 105. The first metal ground 102 may be located only on the first flexible circuit board 104, that is, may be only a metal ground structure in the first flexible circuit board 104.

As shown in fig. 2, in some embodiments, a first connector 15 is further disposed between the first motherboard 105 and the first flexible circuit board 104, and the first motherboard 105 and the first flexible circuit board 104 may be connected by the first connector 15. The first connector 15 may include a socket connector (not shown) and a resilient contact connector (not shown). The elastic contact connector is disposed on the first flexible circuit board 104, the socket connector is disposed on the first motherboard 105, and pins or contact pieces of the elastic contact connector are inserted into the socket connector, so that the first motherboard 105 or the first flexible circuit board 104 can be reliably electrically connected, wherein the elastic contact connector can be a flexible circuit board connector (FPC) or a flexible flat cable connector (FFC). In other embodiments, the first connector 15 may be another type of connector, and is not limited to the type illustrated above.

When the first connector 15 is further disposed between the first motherboard 105 and the first flexible circuit board 104, each metal trace in the at least one first metal trace 101 is divided into two sections, one section is disposed on the first flexible circuit board 104 and extends to the first connector 15, and the other section is disposed on the first motherboard 105 and also extends to the first connector 15, and is connected to form an entire metal trace through the first connector 15.

As shown in fig. 2, in some embodiments, the at least one first metal trace 101 includes a first ground GND1, a first power line Vcc1, and a first signal transmission line Data1. Accordingly, the FM internal antenna 103 may be formed by the first ground GND1 and/or the first metal ground 102, or the first power supply line Vcc1, or the first signal transmission line Data1 to receive FM signals, and the FM internal antenna 103 formed with a length most suitable for receiving FM signals may be selected according to the length of the first ground GND1, the area of the first metal ground 102, the length of the first power supply line Vcc1, and the length of the first signal transmission line Data1, so that the receiving effect is better.

It should be understood that, one of the first metal traces (GND 1, vcc1 or Data 1) and/or the first metal ground 102 is used to form the FM internal antenna 103 to receive FM signals, and the first metal ground 102 may form the FM internal antenna 103 alone or may form the FM internal antenna 103 together with the first ground line GND1, but cannot form the FM internal antenna 103 together with the first power supply line Vcc1 and the first signal transmission line Data1.

Wherein, "one of the first metal traces (GND 1, vcc1, or Data 1) and/or the first metal ground 102 is used to form the FM internal antenna 103 to receive the FM signal" may be understood as "one of the first metal traces (GND 1, vcc1, or Data 1) and/or the first metal ground 102 is used as the FM internal antenna 103 to receive the FM signal", that is, the structure of at least one of the first metal traces 101 and the first metal ground 102 when the original function is implemented may be used as the FM internal antenna 103 to receive the FM signal without any change. For example, the first power line Vcc1 originally functions to transmit a power signal, and may be used as the FM internal antenna 103 to receive an FM signal without changing its structure.

As shown in fig. 2, in some embodiments, the first ground GND1 and the first metal ground 102 form the FM internal antenna 103 to receive FM signals, that is, in some embodiments, the FM internal antenna 103 may be formed of the first ground GND1 and the first metal ground 102. Since the area of the first metal ground 102 in the terminal device 100 is larger than the areas of the first power line Vcc1 and the first signal transmission line Data1, and the first metal ground 102 is usually connected to the first ground GND1, the total length is closer to the optimal FM receiving antenna length when the first ground GND1 and the first metal ground 102 form the FM internal antenna 103, and the FM signal receiving effect is better.

In some embodiments, the first ground GND1 and the first metal ground 102 are disposed on different layers of the first circuit board 10, a via (not shown) may be disposed on the first circuit board 10, the first ground GND1 may be connected to the first metal ground 102 through the via, when the first ground GND1 and the first metal ground 102 form the FM internal antenna 103, the FM demodulator 11 is connected to the first ground GND1, the first ground GND1 and the first metal ground 102 together serve as the FM internal antenna 103 to receive FM signals, and the received FM signals may be transmitted to the FM demodulator 11 through the first ground GND 1.

In other embodiments, the first metal ground 102 may be further connected to the first ground GND1 through a metal wire (not labeled), specifically, one end of the metal wire is connected to the first metal ground 102 on the first flexible circuit board 104, and the other end is connected to the first ground GND 1. For example, when the first ground GND1 is further partially extended on the first main board 105, one end of the metal wire is connected to the first metal ground 102 on the first flexible circuit board 104, and the other end is connected to the portion of the first ground GND1 on the first main board 105. The first metal ground 102 forms the FM internal antenna with the metal wire and the first ground GND1 to receive FM signals, and may be transmitted to the FM demodulator 11 through the first ground GND 1.

As shown in fig. 2, in some embodiments, the terminal device 100 further includes a first pass FM filter 16 and a blocking FM filter 17, where the first pass FM filter 16 is disposed between the FM internal antenna 103 and the FM demodulator 11, and the blocking FM filter 17 is disposed on a line where other first metal wires that do not form the FM internal antenna are located. Therefore, the transmission of the FM signal to other components through the line where the first metal wire which does not form the FM internal antenna is located can be avoided, and the FM signal transmitted to the FM demodulator 11 can be reduced in attenuation degree by all the lines where the FM internal antenna 103 is located.

Here, the first pass FM filter 16 in the present application may refer to a filter that allows FM signals to pass therethrough, and the blocking FM filters (hereinafter, the first blocking FM filter 171, the second blocking FM filter 172, the third blocking FM filter 173, and the fourth blocking FM filter 29) may refer to a filter that blocks FM signals from passing therethrough.

Further, the first pass FM filter 16 may refer to a filter that allows only FM signals to pass.

As shown in fig. 2, in some embodiments, when the first ground GND1 and the first metal ground 102 form the FM internal antenna 103, the first pass FM filter 16 is disposed on a line where the first ground GND1 is located, the FM blocking filter 17 includes a first FM blocking filter 171 and a second FM blocking filter 172, the first FM blocking filter 171 is disposed on a line where the first power line Vcc1 is located, and the second FM blocking filter 172 is disposed on a line where the first signal transmission line Data1 is located.

As shown in fig. 2, in some embodiments, the terminal device 100 further includes a third FM-blocking filter 173, where the third FM-blocking filter 173 is connected between the first ground GND1 and the ground of the first main board 105, so that, when the first ground GND1 and the first metal ground 102 form the FM internal antenna 103, the third FM-blocking filter 173 is used to prevent the FM signal that the FM internal antenna 103 participates in receiving from flowing into the ground of the first main board 105, so that the FM signal can only be transmitted to the FM demodulator 11.

The first ground GND1 may be electrically connected to the first main board 105 through the third FM-rejection filter 173, and the first metal ground 102 may be electrically connected to the first ground GND1 through a via or a metal wire, as described above, and thus the first metal ground 102 may be grounded through the first ground GND 1. Since the third FM-blocking filter 173 only blocks the FM signal from passing therethrough, and does not block other signals from passing therethrough, for example, does not block the direct current signal from passing therethrough, the third FM-blocking filter 173 corresponds to an electrical connector connecting the first ground GND1 and the first metal ground 102, thereby electrically connecting the first ground GND1 and the first main board 105, and simultaneously the third FM-blocking filter 173 blocks the FM signal from passing therethrough, thereby allowing the FM signal to be transmitted only to the FM demodulator 11.

In some embodiments, as shown in fig. 2, the terminal device 100 further includes a signal amplifier 18, where the signal amplifier 18 is connected between the FM internal antenna 103 and the FM demodulator 11, and the signal amplifier 18 is configured to amplify the FM signal received by the FM internal antenna 103 and send the FM signal to the FM demodulator 11. Thus, the FM signal strength entering the FM demodulator 11 can be made stronger, better quality, clearer and more stable.

The signal amplifier 18 may be a LNA (Low Noise Amplifier) amplifier, among other things. The LNA amplifier may provide a high gain that ensures that the input signal is sufficiently amplified as it passes through the amplifier so that subsequent circuitry may be efficiently processed. Low noise figure means that the noise introduced by the LNA amplifier is as small as possible to maintain the sharpness and accuracy of the signal. Therefore, after the FM signal received by the FM internal antenna 103 is amplified by the LNA amplifier, the signal strength is stronger, the quality is better, and the signal is clearer and more stable. It should be appreciated that the signal amplifier 18 may be any other type of amplifier that can make the FM signal stronger, better quality, more clearly stable after amplification, and is not limited to an LNA amplifier.

In other embodiments, when the FM signal receiving efficiency of the FM internal antenna 103 itself is high, the terminal device 100 may not include the signal amplifier 18, but instead, the signal amplifier 18 may be connected between the FM internal antenna 103 and the FM demodulator 11 through a resistor. For example, when the FM reception efficiency of the FM internal antenna 103 itself has been satisfied by the test, the FM signal quality received by the FM internal antenna 103 has been high, and the received FM signal may not be amplified, in which case the terminal device 100 may not include the signal amplifier 18.

In some embodiments, the terminal device 100 further includes a first capacitor C1, where the first capacitor C1 is connected between the first pass FM filter 16 and the FM demodulator 11, and the first capacitor C1 is used to block the direct current signal from passing through.

In some embodiments, as shown in fig. 2 and fig. 5, the terminal device 100 further includes a first connection portion 21, where the first connection portion 21 is configured to connect with a second connection portion 22 of a peripheral device 200 to access the peripheral device 200; when the first connection part 21 of the terminal device 100 is connected with the second connection part 22 of the peripheral device 200, at least part of the structure of the peripheral device 200 is used for forming an FM extension antenna 24 of the terminal device 100, and the FM extension antenna is connected with the FM internal antenna 103 to jointly form an FM combined antenna for receiving FM signals. Thus, for the terminal device 100 with smaller volume, the FM internal antenna 103 and the FM external antenna 24 of the peripheral device 200 together form an FM combined antenna, so that the length of the FM combined antenna is closer to the length of the FM signal optimal receiving antenna, and further, the receiving effect of the FM signal is better.

In some embodiments, as shown in fig. 2, the first connection portion 21 includes at least one first electrical connector 210, where the at least one first electrical connector 210 is respectively connected to at least one first metal trace 101 in the terminal device 100 in a one-to-one correspondence manner, as shown in fig. 5, the peripheral device 200 includes a second metal ground 23 and at least one second metal trace 230 corresponding to the at least one first metal trace 101 in the terminal device 100, and the second connection portion 22 includes at least one second electrical connector 220, where the at least one second electrical connector 220 is respectively connected to at least one second metal trace 230 in the peripheral device 200 in a one-to-one correspondence manner. When the first connection portion 21 of the terminal device 100 is connected to the second connection portion 22 of the peripheral device 200, the at least one second metal trace 230 in the peripheral device 200 is connected to the at least one first metal trace 101 in the terminal device 100 in a one-to-one correspondence, the second metal ground 23 in the peripheral device 200 and/or one of the target metal traces in the peripheral device 200 forms an FM extension antenna 24, and the FM extension antenna 24 and the FM internal antenna 103 together form an FM combined antenna to receive FM signals, wherein the target metal trace is a second metal trace corresponding to the first metal trace forming the FM internal antenna 103 in the terminal device 100. Thus, when the terminal device 100 is connected to the peripheral device 200, the second metal wire corresponding to the first metal wire forming the FM internal antenna 103 in the terminal device 100 in the peripheral device 200 and the FM internal antenna 103 together form an FM combined antenna to receive FM signals, and for the terminal device 100 with a smaller volume, the antenna length for receiving FM signals can be made longer, closer to the optimal receiving antenna length for FM signals, and the FM signal receiving effect is better.

In some embodiments, the first connecting portion 21 is detachably connected to the second connecting portion 22. Thereby allowing the terminal device 100 to be connected to different peripheral devices 200 through the first connection portion 21, and correspondingly, the peripheral devices 200 can also be connected to different terminal devices 100 through the second connection portion 22.

Wherein the detachable connection can be, but is not limited to, a plug-in connection, a magnetic connection, or the like.

In some embodiments, the first connection portion 21 is a popin connector, and the second connection portion 22 is also a popin connector. The at least one first electrical connector 210 comprised by the first connection portion 21 and the at least one second electrical connector 220 comprised by the second connection portion 22 may be conductive contact areas. Therefore, when the first connection part 21 is connected to the second connection part 22, the two popin connectors are brought into contact, and the use is simple and convenient.

When the first connection portion 21 and the second connection portion 22 are the pogin connectors, the connection surfaces of the first connection portion 21 and the second connection portion 22 facing each other in connection may be made of an insulating material, and the at least one first electrical connector 210 included in the first connection portion 21 may be a conductive member disposed on the connection surface of the first connection portion 21 and penetrates through the connection surface of the first connection portion 21, and at least part of the first electrical connector is exposed out of the first connection portion 21 and may extend into the first connection portion 21 to be electrically connected with the corresponding at least one first metal trace 101. Similarly, the at least one second electrical connection element 220 included in the second connection portion 22 may be a conductive element disposed on a connection surface of the second connection portion 22, and penetrates through the connection surface of the second connection portion 22, and is at least partially exposed to the second connection portion 22, and may extend into the second connection portion 22 to be electrically connected with the corresponding at least one second metal trace 230.

When the first connection portion 21 and the second connection portion 22 are the popin connectors, the first connection portion 21 and the second connection portion 22 are at least one pin, that is, the first connection portion 21 and the second connection portion 22 may have at least one conductive contact, not only 3 conductive contacts as indicated in fig. 2 and 5, but also the metal trace serving as the FM epitaxial antenna 24 in the peripheral device 200 is connected with the conductive contact in the second connection portion 22, and the metal trace serving as the FM internal antenna 103 in the terminal device 100 is connected with the conductive contact in the first connection portion 21 when only one conductive contact is provided.

In other embodiments, the first connection portion 21 and the second connection portion 22 may be interfaces, the interface of the terminal device 100 is connected to at least one first metal wire 101 in the terminal device 100, the interface of the peripheral device 200 is connected to at least one second metal wire 230 in the peripheral device 200, and two ends of a data line are respectively connected to the first connection portion 21 and the second connection portion 22, so that the terminal device 100 accesses the peripheral device 200, where the data line may be, but is not limited to, a Type-C line, a USB line, a serial data line, or the like. When the first connection portion 21 and the second connection portion 22 are both interfaces, at least one first electrical connector 210 included in the first connection portion 21 and at least one second electrical connector 220 included in the second connection portion 22 may be pins.

As shown in fig. 5, the at least one second metal trace 230 includes a second ground GND2, a second power line Vcc2, and a second signal transmission line Data2.

As shown in fig. 2, the first connection portion 21 is connected to the first ground line GND1, the first power line Vcc1, and the first signal transmission line Data1, as shown in fig. 5, the second connection portion 22 is connected to the second ground line GND2, the second power line Vcc2, and the second signal transmission line Data2, and when the first connection portion 21 is connected to the second connection portion 22, the first ground line GND1 is connected to the second ground line GND2, the first power line Vcc1 is connected to the second power line Vcc2, and the first signal transmission line Data1 is connected to the second signal transmission line Data2.

Wherein when the first ground GND1 and the first metal ground 102 in the terminal device 100 form the FM internal antenna 103, the target metal trace forming the FM epitaxial antenna 24 in the peripheral device 200 is the second ground GND2. When the first power supply line Vcc1 in the terminal device 100 forms the FM internal antenna 103, the target metal wiring forming the FM epitaxial antenna 24 in the peripheral device 200 is the second power supply line Vcc2. When the first signal transmission line Data1 in the terminal device 100 forms the FM internal antenna 103, the target metal wire forming the FM external antenna 24 in the peripheral device 200 is the second signal transmission line Data2.

In some embodiments, as shown in fig. 6, the terminal device 100 further includes a headset port 19, where the headset port 19 is connected to the FM demodulator 11 and is used to access a headset 300, and when the headset port 19 is connected to the headset 300, at least part of the headset 300 is configured to form an FM external antenna 301 to receive FM signals. Thus, the FM external antenna 301 may also be formed by at least part of the structure of the earphone 300 to receive FM signals.

Wherein the earphone port 19 may be, but is not limited to, a Type-C earphone port and/or a 3.5mm earphone port.

Wherein, the metal wire part in the earphone 300 may form an FM external antenna 301. The term "forming" herein may be understood as "acting as", that is, the metal wire portion in the earphone 300 acts as the FM external antenna 301, that is, the metal wire in the earphone 300 may also act as the FM external antenna 301 to receive FM signals without changing the structure of the metal wire in the earphone when the original function is implemented. Specifically, the metal wire in the earphone 300 has not only the original function of transmitting audio signals, but also the function of receiving FM signals. The earphone 300 may be a wired earphone, and the metal wire in the earphone 300 may include a metal wire in an earphone wire, for example, may include a metal wire such as a ground wire in the earphone wire.

In some embodiments, as shown in fig. 6, the terminal device 100 further includes a switching unit SW for selectively connecting the FM demodulator 11 to one of the FM internal antenna 103 and the earphone port 19. Accordingly, by selecting the FM internal antenna 103 or the FM external antenna 301 to be connected to the FM demodulator 11, the FM signal received from the FM internal antenna 103 or the FM external antenna 301 can be selected to be transmitted to the FM demodulator 11, and the FM internal antenna 103 or the FM external antenna 301 can be selected to be used as needed. Alternatively, when the terminal device 100 accesses the peripheral device 200, the second metal ground 23 in the peripheral device 200 and/or one of the target metal wires (GND 2, vcc2 or Data 2) in the peripheral device 200 forms the FM extension antenna 24 of the terminal device 100, and the FM extension antenna 24 is connected to the FM internal antenna 103 to jointly form an FM combination antenna, the switching unit SW is configured to selectively connect the FM demodulator 11 to one of the FM combination antenna and the earphone port 19.

Wherein, when the terminal device 100 is connected to the peripheral device 200, since the FM internal antenna 103 in the terminal device 100 and the FM external antenna 24 of the peripheral device 200 together form an FM combined antenna, the switching unit SW selects to connect the FM demodulator 11 to the FM internal antenna 103 at this time, that is, corresponds to connecting the FM demodulator 11 to the FM combined antenna.

Therefore, in this application, when the terminal device 100 is not connected to the peripheral device 200, only the FM internal antenna 103 may be included in the terminal device 100, and the switching unit SW selectively connects the FM demodulator 11 to the FM internal antenna 103, and then connects the FM demodulator 11 to only the FM internal antenna 103. And when the terminal device 100 is connected to the peripheral device 200, the second metal ground 23 in the peripheral device 200 and/or one of the target metal wires (GND 2, vcc2 or Data 2) in the peripheral device 200 forms the FM extension antenna 24 of the terminal device, and the FM extension antenna 24 is connected to the FM internal antenna 103 to jointly form an FM combined antenna, the switch unit SW selects to connect the FM demodulator 11 to the FM internal antenna 103, and forms the FM combined antenna jointly for connecting the FM demodulator 11 to the FM extension antenna 24 and the FM internal antenna 103.

In some embodiments, when the earphone port 19 is connected to the earphone 300, the switch unit SW selectively connects the FM demodulator 11 to the earphone port 19, so that the FM demodulator 11 is electrically connected to the earphone 300, and demodulates the FM signal received by the FM external antenna 301 into an audio signal; the switch unit SW selects to connect the FM demodulator 11 to the FM internal antenna 103 when the earphone port 19 is not connected to the earphone 300, so that the FM demodulator 11 demodulates the FM signal received by the FM internal antenna 103 into an audio signal. For the terminal device 100 with smaller volume, the length of the FM external antenna 301 is generally longer than that of the FM internal antenna 103, so that the FM signal receiving effect is better, when the earphone port 19 is connected to the earphone 300, the FM signal received by the FM external antenna 301 is transmitted to the FM demodulator 11 by default, and when the earphone port 19 is not connected to the earphone 300, the FM signal received by the FM internal antenna 103 is transmitted to the FM demodulator 11 by default, so that the quality of the audio signal demodulated by the FM demodulator 11 is higher.

In some embodiments, when the terminal device 100 is not connected to the peripheral device 200, the terminal device 100 may include only the FM internal antenna 103, and the FM signal received by the FM internal antenna 103 is an FM signal received by the FM internal antenna 103 alone. And when the terminal device 100 is connected to the peripheral device 200, the second metal ground 23 in the peripheral device 200 and/or one of the target metal wires (GND 2, vcc2 or Data 2) in the peripheral device 200 form the FM extension antenna 24 of the terminal device, and the FM extension antenna 24 is connected to the FM internal antenna 103 to jointly form an FM combined antenna, the FM signal received by the FM internal antenna 103 is an FM signal received by the FM combined antenna jointly formed by connecting the FM internal antenna 103 to the FM extension antenna 24.

In some embodiments, as shown in fig. 6, the switch unit SW includes a single pole single throw switch SW1, the single pole single throw switch SW1 is connected between the FM internal antenna 103 and the FM demodulator 11, and when the earphone port 19 is connected to the earphone 300, the single pole single throw switch SW1 is turned off; when the earphone port 19 is not connected to the earphone 300, the single pole single throw switch SW1 is closed. Therefore, when the earphone port 19 is connected to the earphone 300, the FM demodulator 11 can be connected to the earphone port 19 through the single-pole single-throw switch SW1, and when the earphone port 19 is not connected to the earphone 300, the FM demodulator 11 is connected to the FM internal antenna 103, so that the structure is simple.

In some embodiments, the terminal device 100 further includes a signal amplifier 18, and the switching unit SW may be disposed in the signal amplifier 18.

In other embodiments, as shown in fig. 7, the switch unit SW includes a first single-pole double-throw switch SW2, where the first single-pole double-throw switch SW2 is connected between the FM internal antenna 103, the earphone port 19 and the FM demodulator 11, and the first single-pole double-throw switch SW2 electrically connects the earphone port 19 and the FM demodulator 11 when the earphone port 19 is connected to the earphone 300; when the earphone port 19 is not connected to the earphone 300, the first single pole double throw switch SW2 electrically connects the FM internal antenna 103 to the FM demodulator 11. Therefore, when the earphone port 19 is connected to the earphone 300, the FM demodulator 11 can be connected to the earphone port 19, and when the earphone port 19 is not connected to the earphone 300, the FM demodulator 11 can be connected to the FM internal antenna 103 by the first single-pole double-throw switch SW2, so that the structure is simple.

In some embodiments, as shown in fig. 7, the first single pole double throw switch SW2 includes a fixed end 202a, two free ends 202b and a throwing end 202c, the fixed end 202a is connected to the FM demodulator 11, the two free ends 202b are respectively connected to the FM internal antenna 103 and the ear phone port 19, one end of the throwing end 202c is freely connected to the fixed end 202a, and the other end is selectively connected to one of the free ends 202b, so as to electrically connect the ear phone port 19 to the FM demodulator 11 or electrically connect the FM internal antenna 103 to the FM demodulator 11.

In some embodiments, as shown in fig. 8, the terminal device 100 further includes a detection module 34, where the detection module 34 is connected to the FM demodulator 11, and the detection module 34 is configured to detect the audio signal demodulated by the FM demodulator 11 to obtain the quality of the FM signal received by the FM internal antenna 103 and the quality of the FM signal received by the FM external antenna 301; the switch unit SW is configured to selectively connect the FM demodulator 11 to the FM internal antenna 103 or the earphone port 19 according to the quality of the FM signal received by the FM internal antenna 103 and the quality of the FM signal received by the FM external antenna 301 detected by the detection module 34. Therefore, the detection module 34 can detect the quality of the FM signal received by the FM internal antenna 103 and the FM external antenna 301, and can select the FM internal antenna 103 or the FM external antenna 301 with better signal quality to receive the FM signal, so as to effectively improve the communication performance.

In some embodiments, the switch unit SW may be configured to connect the FM demodulator 11 to the FM internal antenna 103 and the FM external antenna 301, respectively, so that the FM signals received by the FM internal antenna 103 and the FM external antenna 301 are transmitted to the FM demodulator 11, respectively, and thus the detection module 34 may detect the audio signal demodulated by the FM demodulator 11 from the FM signal received by the FM internal antenna 103 to obtain the quality of the FM signal received by the FM internal antenna 103, and detect the audio signal demodulated by the FM demodulator 11 from the FM signal received by the FM external antenna 301 to obtain the quality of the FM signal received by the FM external antenna 301, respectively. Then, the switching unit SW may finally select to connect the FM demodulator 11 to the FM internal antenna 103 or the FM external antenna 301 according to the quality of the FM signal received by the FM internal antenna 103 and the quality of the FM signal received by the FM external antenna 301 detected by the detecting module 34, respectively.

In this application, when the terminal device 100 is not connected to the peripheral device 200, the terminal device 100 may include only the FM internal antenna 103, and the detection module 34 detects the quality of the FM signal received by the FM internal antenna 103, which means that the detection module 34 detects the FM signal received by the FM internal antenna 103 alone. When the terminal device 100 is connected to the peripheral device 200, the FM internal antenna 103 in the terminal device 100 and the FM external antenna 24 of the peripheral device 200 together form an FM combined antenna, and the detection module 34 is connected to the FM internal antenna 103, so that the detection module 34 detects the quality of the FM signal received by the FM internal antenna 103, which means that the detection module 34 detects the quality of the FM signal received by the FM combined antenna. Wherein the switching unit SW selects to connect the FM demodulator 11 to the FM internal antenna 103 when the quality of the FM signal received by the FM internal antenna 103 is higher than the quality of the FM signal received by the FM external antenna 301; and selecting to connect the FM demodulator 11 to the earphone port 19 when the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103. Thus, the FM signal transmitted to the FM demodulator 11 may be an FM signal having a higher quality from among the FM signal received by the FM internal antenna 103 and the FM signal received by the FM external antenna 301.

In some embodiments, as shown in fig. 8, the switch unit SW may include a first single-pole single-throw switch SW3 and a second single-pole single-throw switch SW4, where the first single-pole single-throw switch SW3 is connected between the FM internal antenna 103 and the FM demodulator 11, the second single-pole single-throw switch SW4 is connected between the earphone port 19 and the FM demodulator 11, and when the quality of the FM signal received by the FM internal antenna 103 is higher than the quality of the FM signal received by the FM external antenna 301, the first single-pole single-throw switch SW3 is closed and the second single-pole single-throw switch SW4 is opened; when the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103, the first single-pole single-throw switch SW3 is opened, and the second single-pole single-throw switch SW4 is closed. Therefore, the FM signal with higher quality of the FM signal received by the FM internal antenna 103 and the FM signal received by the FM external antenna 301 is transmitted to the FM demodulator 11 through the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW 4.

In some embodiments, when the switching unit SW includes a first single-pole single-throw switch SW3 and a second single-pole single-throw switch SW4, the switching unit SW may be implemented in such a manner that the FM demodulator 11 is connected to the FM internal antenna 103 and the FM external antenna 301 in advance, respectively, and the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4 are in on states, respectively. That is, when the first single-pole single-throw switch SW3 is in the on state, the turned-on first single-pole single-throw switch SW3 connects the FM demodulator 11 to the FM internal antenna 103, and when the second single-pole single-throw switch SW4 is in the on state, the turned-on second single-pole single-throw switch SW4 connects the FM demodulator 11 to the earphone port 19.

In some embodiments, by default, the first single pole single throw switch SW3 is closed, i.e. turned on, and the FM demodulator 11 is connected to the FM internal antenna 103, wherein, as described above, when the terminal device 100 is connected to the peripheral device 200, the FM internal antenna 103 and the FM external antenna 24 are connected together to form an FM combined antenna, and therefore, the FM demodulator 11 is connected to the FM internal antenna 103, i.e. to the FM combined antenna, and the detection module 34 detects the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna. When it is detected that the earphone 300 is inserted into the earphone port 19, the first single-pole single-throw switch SW3 is opened, the second single-pole single-throw switch SW4 is closed, the FM demodulator 11 is connected to the earphone port 19, the detection module 34 detects the quality of the FM signal received by the FM external antenna 301, and when the first controller 25 determines that the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna is higher than the quality of the FM signal received by the FM external antenna 301, the first single-pole single-throw switch SW3 is controlled to be closed, and the second single-pole single-throw switch SW4 is opened to selectively connect the FM demodulator 11 to the FM internal antenna 103; when the first controller 25 determines that the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna, the first single pole single throw switch SW3 is controlled to be turned off, and the second single pole single throw switch SW4 is controlled to be turned on, so that the FM demodulator 11 is selectively connected to the earphone port 19.

In other embodiments, when it is detected that the earphone 300 is inserted into the earphone port 19, the second single-pole single-throw switch SW4 is turned on by default, the FM demodulator 11 is connected to the earphone port 19, the detection module 34 detects the quality of the FM signal received by the FM external antenna 301, when the quality of the FM signal received by the FM external antenna 301 is lower than the preset threshold, the first single-pole single-throw switch SW3 is turned on, the second single-pole single-throw switch SW4 is turned off, the FM demodulator 11 is connected to the FM internal antenna 103, and the FM signal received by the FM internal antenna 103 or the FM combined antenna is transmitted to the FM demodulator 11.

In other embodiments, as shown in fig. 9, the switch unit SW includes a second single-pole double-throw switch SW5, where the second single-pole double-throw switch SW5 is connected between the FM demodulator 11, the FM internal antenna 103 and the earphone port 19, and the second single-pole double-throw switch SW5 electrically connects the FM internal antenna 103 with the FM demodulator 11 when the quality of the FM signal received by the FM internal antenna 103 or the FM combined antenna is higher than the quality of the FM signal received by the FM external antenna 301; when the quality of the FM signal received by the FM external antenna 301 is higher than the quality of the FM signal received by the FM internal antenna 103 or the FM combination antenna, the second single pole double throw switch SW5 electrically connects the earphone port 19 to the FM demodulator 11. Therefore, the FM signal received by the FM internal antenna 103 or the FM combined antenna and the FM signal received by the FM external antenna 301 with higher quality are transmitted to the FM demodulator 11 through the second single pole double throw switch SW5, which has a simple structure.

The structure of the second single-pole double-throw switch SW5 is the same as or similar to that of the first single-pole double-throw switch SW2, and reference may be made to the description of the structure of the first single-pole double-throw switch SW2, which is not repeated here.

The second single-pole double-throw switch SW5 has the same functions as the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4, and can be replaced with the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW 4. That is, in some embodiments, the second single-pole double-throw switch SW5 may be used to implement the switching, or the two single-pole single-throw switches of the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4 may be used to implement the switching, so that the second single-pole double-throw switch SW5 electrically connects the earphone port 19 with the FM demodulator 11 or electrically connects the FM internal antenna 103 with the FM demodulator 11, and the switching unit SW may include the on and off logic of the first single-pole single-throw switch SW3 and the second single-pole single-throw switch SW4, which is not described herein.

In some embodiments, as shown in fig. 2, the playing unit 12 includes an audio amplifier 121 and an audio output unit 122, where the audio amplifier 121 is connected to the FM demodulator 11 and the audio output unit 122, and the audio amplifier 121 is used for amplifying the power of the audio signal demodulated by the FM demodulator 11, and the audio output unit 122 is used for outputting audio. Thus, the audio output by the audio output unit 122 can be distorted less and have better quality.

Wherein the audio output 122 may be, but is not limited to, a speaker, horn, or the like.

In some embodiments, as shown in fig. 2, the terminal device 100 further includes a first controller 25, where the first controller 25 is connected between the audio power amplifier 121 and the FM demodulator 11, and the first controller 25 may receive an audio signal demodulated by the FM demodulator 11 and control the audio power amplifier 121 to amplify the audio signal.

The first controller 25 may be a central processing unit (Central Processing Unit, CPU), a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an Application-specific integrated circuit (ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof.

In some embodiments, as shown in fig. 2, the terminal device 100 further includes a first power supply E1, one end of the first power supply line Vcc1 is connected to the first power supply E1, the other end is connected to the first connection portion 21, as shown in fig. 5, the peripheral device 200 further includes a second power supply E2, one end of the second power supply line Vcc2 is connected to the second power supply E2, the other end is connected to the second connection portion 22, when the first connection portion 21 is connected to the second connection portion 22, the first power supply E1 is connected to the second power supply E2, and at this time, the first power supply E1 may charge the second power supply E2, or the second power supply E2 may charge the first power supply E1, so that, in a case where an external power supply (not labeled) may charge only the terminal device 100 or the peripheral device 200, both the terminal device 100 and the peripheral device 200 may be charged.

In some embodiments, as shown in fig. 2, one end of the first signal transmission line Data1 is connected to the first controller 25, the other end is connected to the first connection part 21, as shown in fig. 5, the peripheral device 200 includes a second controller 28, one end of the second signal transmission line Data2 is connected to the second controller 28, the other end is connected to the second connection part 22, and when the first connection part 21 is connected to the second connection part 22, the first controller 25 and the second controller 28 may communicate with the second signal transmission line Data2 through the first signal transmission line Data 1.

As shown in fig. 10, in other embodiments, the first power line Vcc1 forms the FM internal antenna 103. In the terminal device 100, the length of some of the first power lines Vcc1 may be closer to the optimal FM receiving antenna length than the length of other first metal traces and metal grounds, and the first power lines Vcc1 may be selected to form the FM internal antenna 103. When the first power line Vcc1 forms the FM internal antenna 103, the FM demodulator 11 is connected to the first power line Vcc 1.

As shown in fig. 10, in other embodiments, when the first power line Vcc1 forms the FM internal antenna 103, the FM-blocking filter 17 includes a first FM-blocking filter 171 and a second FM-blocking filter 172, the first FM-blocking filter 16 is disposed on the line where the first power line Vcc1 is located, the FM-blocking filter 17 includes a first FM-blocking filter 171 and a second FM-blocking filter 172, the first FM-blocking filter 171 is disposed on the line where the first ground line GND1 is located, and the second FM-blocking filter 172 is disposed on the line where the first signal transmission line Data1 is located.

As shown in fig. 10, in other embodiments, the terminal device 100 further includes a third FM-blocking filter 173, where the third FM-blocking filter 173 is connected between the first power supply E1 and the first power line Vcc1, and the third FM-blocking filter 173 is configured to prevent the FM signal that is received by the FM internal antenna 103 from flowing into the first power supply E1, and cannot be transmitted to the FM demodulator 11 or is attenuated.

In still other embodiments, as shown in fig. 11, the first signal transmission line Data1 forms the FM internal antenna 103. In the terminal device 100, the length of the first signal transmission line Data1 is closer to the length of the optimal FM receiving antenna than the length of the other first metal traces and the length of the metal ground, the first power line Vcc1 may also be selected to form the FM internal antenna 103. When the first signal transmission line Data1 forms the FM internal antenna 103, the FM demodulator 11 is connected to the first signal transmission line Data 1.

As shown in fig. 11, in still other embodiments, when the first signal transmission line Data1 forms the FM internal antenna 103, the FM-blocking filter 17 includes a first FM-blocking filter 171 and a second FM-blocking filter 172, the first FM-blocking filter 16 is disposed on the line where the first signal transmission line Data1 is located, the FM-blocking filter 17 includes a first FM-blocking filter 171 and a second FM-blocking filter 172, the first FM-blocking filter 171 is disposed on the line where the first ground line GND1 is located, and the second FM-blocking filter 172 is disposed on the line where the first power line Vcc1 is located.

As shown in fig. 11, in still other embodiments, the terminal device 100 further includes a third FM-rejection filter 173, where the third FM-rejection filter 173 is connected between the first signal transmission line Data1 and the first controller 25, and the third FM-rejection filter 173 is configured to prevent the FM signal that the FM internal antenna 103 participates in receiving from flowing into the first controller 25, and cannot be transmitted to the FM demodulator 11 or is attenuated.

In some embodiments, as shown in fig. 2 and fig. 5, a peripheral device 200 includes a second connection portion 22, where the second connection portion 22 is configured to connect with the first connection portion 21 of the terminal device 100 in the foregoing embodiment, and when the second connection portion 22 of the peripheral device 200 is connected with the first connection portion 21 of the terminal device 100, at least part of the structure of the peripheral device 200 is configured to form the FM extension antenna 24 of the terminal device 100, and the FM extension antenna 24 is connected with the FM internal antenna 103 to jointly form an FM combination antenna to receive FM signals.

Therefore, when the peripheral device 200 is connected with the terminal device 100 with smaller volume, the FM extension antenna 24 of the peripheral device 200 and the FM internal antenna 103 of the terminal device 100 together form the FM combined antenna, so that the length of the FM combined antenna is closer to the length of the FM signal optimal receiving antenna, and further, the receiving effect of the FM signal is better.

In some embodiments, as shown in fig. 2 and fig. 5, the peripheral device 200 includes a second metal ground 23 and at least one second metal trace 230 corresponding to the at least one first metal trace 101 in the terminal device 100, and the second connection portion 22 includes at least one second electrical connector 220, where the at least one second electrical connector 220 is respectively connected to the at least one second metal trace 230 in the peripheral device 200 in a one-to-one correspondence. When the second connection portion 22 of the peripheral device 200 is connected to the first connection portion 21 of the terminal device 100, the at least one second metal trace 230 in the peripheral device 200 is connected to the at least one first metal trace 101 in the terminal device 100 in a one-to-one correspondence, the second metal ground 23 in the peripheral device 200 and/or one of the target metal traces in the peripheral device 200 forms an FM extension antenna 24, and the FM extension antenna 24 and the FM internal antenna 103 together form an FM combined antenna to receive FM signals, wherein the target metal trace is a second metal trace corresponding to the first metal trace forming the FM internal antenna 103 in the terminal device 100.

Thus, for the terminal device 100 with smaller volume, when the second connection portion 22 of the peripheral device 200 is connected to the first connection portion 21 of the terminal device 100, the second metal wire corresponding to the first metal wire forming the FM internal antenna 103 in the peripheral device 200 and the FM internal antenna 103 together form an FM combined antenna to receive the FM signal, and for the terminal device 100 with smaller volume, the antenna length for receiving the FM signal can be made longer, closer to the optimal receiving antenna length for the FM signal, and the FM signal receiving effect is better.

In some embodiments, as shown in fig. 5, the FM internal antenna 103 is formed by a first ground GND1 and a first metal ground 102 in the terminal device 100, the peripheral device 200 further includes a first bluetooth antenna 26 and a second through FM filter 27, the second through FM filter 27 is connected between the first bluetooth antenna 26 and a second metal ground 23 of the peripheral device 200, the second metal ground 23 in the peripheral device 200, a second ground GND2 in the peripheral device 200, and the first bluetooth antenna 26 form the FM external antenna 24, and when the peripheral device 200 is connected to the terminal device 100, the FM external antenna 24 in the peripheral device 200 and the FM internal antenna 103 in the terminal device 100 together form the FM combined antenna. Thus, when the peripheral device 200 is connected to the peripheral device 200, the first bluetooth antenna 26, the second metal ground 23 of the peripheral device 200, the second ground GND2 of the peripheral device 200, and the FM internal antenna 103 in the terminal device 100 together form the FM combined antenna, so that for the terminal device 100 with a smaller volume, the antenna length for receiving FM signals is longer, and is closer to the optimal receiving antenna length for FM signals, and the FM signal receiving effect is better.

In some embodiments, as shown in fig. 5, the peripheral device 200 includes a second controller 28 and a fourth FM-blocking filter 29, the second controller 28 includes a bluetooth module 280, and the fourth FM-blocking filter 29 is connected between the first bluetooth antenna 26 and the bluetooth module 280. Wherein, the bluetooth module 280 may control the first bluetooth antenna 26 to transmit and receive signals. Thus, it is possible to avoid that the FM signal is transmitted to the bluetooth module 280 when the first bluetooth antenna 26 participates in receiving the FM signal, thereby causing the FM signal transmitted to the FM demodulator 11 to be attenuated to an increased extent.

In some embodiments, the peripheral device 200 further includes a filter F, where the filter F is connected between the second controller 28 and the fourth FM-rejection filter 29, and the filter F is used for filtering the bluetooth signals received and transmitted by the first bluetooth antenna 26.

In some embodiments, the terminal device 100 further includes a second bluetooth antenna (not labeled), and the terminal device 100 and the peripheral device 200 may communicate with the second bluetooth antenna through the first bluetooth antenna 26.

In some embodiments, as shown in fig. 5, the peripheral device 200 further includes a second circuit board 30, and the at least one second metal trace 230 and the second metal ground 23 are at least partially disposed on the second circuit board 30. The second circuit board 30 may be a flexible circuit board (FPC, flexible printed circuit), a rigid printed circuit board (PCB, printed circuit board), or a flexible circuit board in one part and a rigid printed circuit board in the other part.

In some embodiments, as shown in fig. 5, the second circuit board 30 includes a second flexible circuit board 303 and a second main board 302, where the second main board 302 is a rigid circuit board, and the second flexible circuit board 303 is connected to the second main board 302.

In some embodiments, as shown in fig. 5, the second motherboard 302 and the second flexible circuit board 303 may be connected by a second connector 31. The second connector 31 may include a socket connector (not shown) and a resilient contact connector (not shown). The elastic contact connector is disposed on the second flexible circuit board 303, the socket connector is disposed on the second main board 302, and pins or contact pieces of the elastic contact connector are inserted into the socket connector, so that the second main board 302 or the second flexible circuit board 303 can be reliably electrically connected, wherein the elastic contact connector can be a flexible circuit board connector (FPC) or a flexible flat cable connector (FFC). In other embodiments, the second connector 31 may be another type of connector, and is not limited to the type illustrated above.

When the second connector 31 is further disposed between the second main board 302 and the second flexible circuit board 303, each metal trace in the at least one second metal trace 230 is divided into two sections, one section is disposed on the second flexible circuit board 303 and extends to the second connector 31, and the other section is disposed on the second main board 302 and also extends to the second connector 31, and is connected to form an entire metal trace through the second connector 31.

In some embodiments, the peripheral device 200 is a keyboard, so, as shown in fig. 5, the peripheral device 200 may further include a key array 33, where the key array 33 is connected to the second circuit board 30, and the second metal ground 23 may be disposed on the key array 33 and the second circuit board 30.

In some embodiments, as shown in fig. 5, the peripheral device 200 may further include a touch pad 32, where the touch pad 32 is connected to the second circuit board 30, and the second metal ground 23 may be disposed on the touch pad 32, the key array 33, and the second circuit board 30.

In the foregoing embodiments, the terms "first", "second", and the like are used for distinguishing between different objects and not for describing a particular sequence, and furthermore, the terms "upper", "lower", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

In the foregoing embodiments, unless explicitly stated and limited otherwise, the term "coupled" should be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or integrally coupled; can be directly connected, can also be indirectly connected through an intermediate medium, and can also be the communication between the two elements; may be a communication connection; may be an electrical connection. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In the foregoing embodiments, the descriptions of the various embodiments are focused on, and parts of a certain embodiment that are not described in detail may refer to related descriptions of other embodiments, and various embodiments may be adaptively combined into other new embodiments, where the embodiments described in the application are only a part of the embodiments of the application, but not all of the embodiments, and all other embodiments obtained by a person of ordinary skill in the art without performing creative efforts based on the embodiments in the application are all within the scope of protection of the application.

The foregoing is a description of embodiments of the present application, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the embodiments of the present application, and these improvements and modifications are also considered as the protection scope of the present application.

Claims

1. A terminal device, characterized in that the terminal device comprises a circuit board, an FM demodulator and a playing unit; the circuit board is provided with at least one metal wire and a first metal ground, wherein one metal wire and/or the first metal ground is/are used for forming an FM built-in antenna to receive FM signals; the FM demodulator is connected with the playing unit of the FM built-in antenna, and is used for demodulating the FM signal received by the FM built-in antenna into an audio signal and sending the audio signal to the playing unit for playing.

2. The terminal device of claim 1, wherein the at least one metal trace includes a ground line, a power line, and a signal transmission line.

3. The terminal device of claim 2, wherein the ground wire and the first metallic ground are used to form an FM internal antenna to receive FM signals.

4. The terminal device of claim 1, further comprising a first pass FM filter and a blocking FM filter, wherein the first pass FM filter is disposed between the FM internal antenna and the FM demodulator, and wherein the blocking FM filter is disposed on a line where other metal wires not forming the FM internal antenna are located.

5. The terminal device according to claim 1, further comprising a signal amplifier connected between the FM internal antenna and the FM demodulator, the signal amplifier being configured to amplify the FM signal received by the FM internal antenna and transmit the signal to the FM demodulator.

6. The terminal device of claim 1, further comprising a first connection portion for connecting with a second connection portion of a peripheral device for accessing the peripheral device, at least a portion of the peripheral device being configured to form an FM extension antenna of the terminal device when the first connection portion of the terminal device is connected with the second connection portion of the peripheral device, the FM extension antenna and the FM internal antenna being connected to collectively form an FM combination antenna for receiving FM signals.

7. The terminal device of claim 6, wherein the first connection portion includes at least one first electrical connector, the at least one first electrical connector being respectively connected in one-to-one correspondence with at least one metal trace in the terminal device, the peripheral device includes a second metal ground and at least one metal trace corresponding to the at least one metal trace in the terminal device, the second connection portion includes at least one second electrical connector, the at least one second electrical connector being respectively connected in one-to-one correspondence with at least one metal trace in the peripheral device; when the first connection part of the terminal equipment is connected with the second connection part of the peripheral equipment, the at least one metal wire in the peripheral equipment is connected with the at least one metal wire in the terminal equipment in a one-to-one correspondence mode, a second metal ground in the peripheral equipment and/or one target metal wire in the peripheral equipment form an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna is connected with the FM built-in antenna to jointly form an FM combined antenna so as to receive FM signals, wherein the target metal wires are metal wires corresponding to metal wires forming an FM built-in antenna in the terminal equipment.

8. The terminal device of claim 6, wherein the first connection portion and the second connection portion are detachably connected.

9. The terminal device of claim 8, wherein the first connection is a popin connector, and wherein the second connection is also a popin connector.

10. The terminal device according to any of claims 1-9, further comprising a headset port, the headset port being connected to the FM demodulator and being adapted to be connected to a headset, wherein at least part of the headset is configured to form an FM external antenna of the terminal device for receiving FM signals when the headset port is connected to the headset.

11. The terminal device according to claim 10, further comprising a switching unit for selecting one of the FM internal antenna and the earphone port to connect the FM demodulator.

12. The terminal device according to claim 11, wherein the switch unit selects to connect the FM demodulator to the earphone port when the earphone port is connected to the earphone, so that the FM demodulator is electrically connected to the earphone, and demodulates the FM signal received by the FM external antenna into an audio signal; the switch unit selectively connects the FM demodulator to the FM internal antenna when the earphone port is not connected with the earphone, so that the FM demodulator demodulates the FM signal received by the FM internal antenna into an audio signal.

13. The terminal device according to claim 12, wherein the switch unit includes a single pole single throw switch connected between the FM internal antenna and the FM demodulator, the single pole single throw switch being turned off when the earphone port is connected to an earphone; when the earphone port is not connected with the earphone, the single-pole single-throw switch is closed; or,

the switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch is connected among the FM built-in antenna, the earphone port and the FM demodulator, and when the earphone port is connected with an earphone, the single-pole double-throw switch electrically connects the earphone port with the FM demodulator; when the earphone port is not connected with the earphone, the single-pole double-throw switch electrically connects the FM internal antenna with the FM demodulator.

14. The terminal device according to claim 11, further comprising a detection module connected to the FM demodulator, the detection module being configured to detect a quality of an FM signal received by the FM internal antenna and a quality of an FM signal received by the FM external antenna by detecting an audio signal output by the FM demodulator demodulation; the switch unit is used for selectively connecting the FM demodulator to the FM internal antenna or the earphone port according to the quality of the FM signal received by the FM internal antenna and the quality of the FM signal received by the FM external antenna detected by the detection module.

15. The terminal device according to claim 14, wherein the switching unit selects to connect the FM demodulator to the FM internal antenna when the quality of the FM signal received by the FM internal antenna is higher than the quality of the FM signal received by the FM external antenna; and selecting to connect the FM demodulator to the earphone port when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna.

16. The terminal device according to claim 15, wherein the switch unit includes a first single-pole single-throw switch connected between the FM internal antenna and the FM demodulator and a second single-pole single-throw switch connected between the earphone port and the FM demodulator, the first single-pole single-throw switch being closed when the quality of the FM signal received by the FM internal antenna is higher than the quality of the FM signal received by the FM external antenna, the second single-pole single-throw switch being opened; when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna, the first single-pole single-throw switch is opened, and the second single-pole single-throw switch is closed; or,

The switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch is connected among the FM demodulator, the FM internal antenna and the earphone port, and when the quality of an FM signal received by the FM internal antenna is higher than that of an FM signal received by the FM external antenna, the single-pole double-throw switch electrically connects the FM internal antenna with the FM demodulator; and when the quality of the FM signal received by the FM external antenna is higher than that of the FM signal received by the FM internal antenna, the single-pole double-throw switch electrically connects the earphone port with the FM demodulator.

17. The terminal device according to claim 1, wherein the playing unit includes an audio amplifier and an audio output member, the audio amplifier is connected to the FM demodulator and the audio output member, the audio amplifier is configured to amplify power of the audio signal demodulated by the FM demodulator, and the audio output member is configured to output audio.

18. A peripheral device comprising a second connection portion for connection with the first connection portion of the terminal device of any of claims 1-17, at least part of the structure of the peripheral device being adapted to form an FM extension antenna of the terminal device when the second connection portion of the peripheral device is connected with the first connection portion of the terminal device, the FM extension antenna being connected with the FM internal antenna to jointly form an FM combination antenna for receiving FM signals.

19. The peripheral device of claim 18, wherein the peripheral device comprises a second metal ground and at least one metal trace corresponding to the at least one metal trace in the terminal device, the second connection portion comprising at least one second electrical connection, the at least one second electrical connection being respectively connected in one-to-one correspondence with the at least one metal trace in the peripheral device;

when the second connection part of the peripheral equipment is connected with the first connection part of the terminal equipment, the at least one metal wire in the peripheral equipment is connected with the at least one metal wire in the terminal equipment in a one-to-one correspondence manner, at least the second metal ground in the peripheral equipment and/or one target metal wire in the peripheral equipment form an FM epitaxial antenna of the terminal equipment, and the FM epitaxial antenna is connected with an FM built-in antenna of the terminal equipment to jointly form an FM combined antenna so as to receive FM signals;

the target metal wire is a metal wire corresponding to the metal wire forming the FM built-in antenna in the terminal equipment, and the first connecting part comprises at least one first electric connecting piece which is respectively connected with at least one metal wire in the terminal equipment in a one-to-one correspondence manner.

20. The peripheral device of claim 19, wherein an FM internal antenna in the terminal device is formed by the first metal ground and a ground line of the terminal device, the peripheral device further comprising a bluetooth antenna and a second through FM filter connected between the bluetooth antenna and a second metal ground of the peripheral device, the second metal ground in the peripheral device, the ground line in the peripheral device, and the bluetooth antenna forming the FM extension antenna, the FM extension antenna in the peripheral device and the FM internal antenna in the terminal device together forming the FM combination antenna when the peripheral device is connected to the terminal device.

21. The peripheral device of claim 18, wherein the peripheral device is a keyboard.

22. A terminal system comprising a terminal device according to any of claims 1-17 and a peripheral device according to any of claims 18-21.