CN113949755A

CN113949755A - Electronic equipment and wired earphone

Info

Publication number: CN113949755A
Application number: CN202010692097.2A
Authority: CN
Inventors: 马雷; 王朝; 罗伟
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2022-01-18
Anticipated expiration: 2040-07-17
Also published as: CN113949755B

Abstract

The application relates to the field of wireless communication, in particular to electronic equipment and a wired earphone, wherein the electronic equipment comprises an external interface and an FM demodulator; the peripheral interface comprises a plurality of pins and is provided with an FM transmission control circuit corresponding to the peripheral interface, wherein the FM transmission control circuit is respectively connected with at least one pin of the plurality of pins and the FM demodulator, and the pin connected with the FM transmission control circuit is used for receiving FM signals and inputting the received FM signals into the FM demodulator through the FM transmission control circuit. The FM transmission control circuit connected with the pins in the peripheral interface is arranged in the electronic equipment, so that the function of receiving FM signals and processing FM signals by taking the earphone as an antenna is realized.

Description

Electronic equipment and wired earphone

Technical Field

The present application relates to the field of wireless communication, and in particular, to an electronic device and a wired headset.

Background

In electronic devices such as mobile phones, a Frequency Modulation (FM) module is generally integrated to enable a user of the electronic device to listen to FM signals, but the electronic devices such as mobile phones do not generally have an FM antenna built therein, but rather use an earphone line as the FM antenna. This is because: on one hand, if an FM antenna is built in an electronic device such as a mobile phone, the transmission of cellular signals may be affected, and on the other hand, because most of the current designs of mobile phones are very light and thin, there is usually not enough space for increasing the FM antenna. Therefore, electronic devices such as mobile phones generally use earphone cables as FM antennas, and the device side or the earphone side is matched with corresponding FM circuits to implement FM functions.

At present, an FM circuit is designed for a 3.5mm earphone, however, along with the gradual thinning of electronic devices such as mobile phones, a traditional 3.5mm earphone interface is being abandoned gradually, and an earphone (hereinafter referred to as "TYPE-C earphone") adopting a Universal Serial Bus (USB) TYPE-C interface is increasingly replacing the traditional 3.5mm earphone, but at present, the TYPE-C earphone still lacks a mature circuit for realizing the FM function.

Disclosure of Invention

An object of this application is to provide a FM circuit implementation scheme of TYPE-C earphone to realize the FM function on the basis that does not influence the original function of TYPE-C earphone.

In a first aspect, an embodiment of the present application provides an electronic device, where the electronic device includes a peripheral interface and an FM demodulator;

the peripheral interface comprises a plurality of pins and is provided with an FM transmission control circuit corresponding to the peripheral interface, wherein the FM transmission control circuit is respectively connected with at least one pin of the plurality of pins and the FM demodulator, and the pin connected with the FM transmission control circuit is used for receiving FM signals and inputting the received FM signals into the FM demodulator through the FM transmission control circuit. The FM signal received by the pin of the peripheral interface is input into the FM demodulator by arranging the FM transmission control circuit, so that the functions of receiving the FM signal and processing the FM signal by the electronic equipment are realized.

In a possible implementation of the first aspect, the pin connected to the FM transmission control circuit is used to connect to a remote device or a ground point in a wired headset connected to the peripheral interface, so as to receive an FM signal through an FM antenna and input the received FM signal to the FM demodulator through the FM transmission control circuit, where the FM antenna includes a headset connector of the wired headset connected to the peripheral interface and at least a part of a headset cord.

In the scheme, the remote device or the grounding point in the wired earphone is connected with the pin connected with the FM transmission control circuit in the electronic equipment, and the earphone wire of the wired earphone is used as the FM antenna to receive FM signals, so that the earphone wire of the wired earphone is fully and effectively utilized, and the cost of the built-in FM antenna of the electronic equipment such as a mobile phone is saved.

In one possible implementation of the first aspect, the FM transmission control circuit includes an FM blocking filter and an FM passing filter; the first end of the through FM filter is connected with the at least one pin in the peripheral interface, and the second end of the through FM filter is connected with the FM demodulator so as to transmit FM signals in signals output by the at least one pin to the FM demodulator; the first end of the FM blocking filter and the at least one pin of the peripheral interface are used for preventing FM signals in signals output by the at least one pin from passing through the FM blocking filter.

In the scheme, the FM signal can be transmitted to the FM demodulator by the FM filter, the non-FM signal is blocked from being transmitted to the FM demodulator, and the signal transmitted to the FM demodulator is ensured to be the FM signal. The FM blocking filter can block the FM signal from being transmitted to other devices, thereby preventing the FM signal from being attenuated.

In a possible implementation of the first aspect, the at least one pin includes a first reserved pin and a second reserved pin, and the FM transmission control circuit includes a first pass FM filter, a first stop FM filter, a second pass FM filter, and a second stop FM filter; the first end of the first pass FM filter and the first end of the first stop FM filter are connected with a first reserved pin in the peripheral interface, the first end of the second pass FM filter and the first end of the second stop FM filter are connected with a second reserved pin in the peripheral interface, the first reserved pin is used for being connected with a microphone in an analog earphone connected to the peripheral interface, and the second reserved pin is used for being connected with a grounding point of the analog earphone connected to the peripheral interface.

Here, after the analog earphone is connected to the peripheral interface of the electronic device, the first reserved pin in the peripheral interface may be connected to the microphone of the analog earphone, and the second reserved pin may be connected to the ground point of the analog earphone. Thus, by connecting the FM transmission control circuit to the two pins, the FM signal can be received by the analog headphone. Moreover, two groups of filters are adopted to simultaneously connect two pins, so that FM signal transmission and non-FM signal transmission can be transmitted to the corresponding demodulator for processing no matter the analog earphone is in positive connection or reverse connection with an external interface of the electronic equipment. It is understood that in other embodiments, a set of filters (a pass FM filter and a stop FM filter) may be connected to only one reserved pin.

In a possible implementation of the first aspect, the at least one pin includes a first identification/configuration pin and a second identification/configuration pin, and the FM transmission control circuit includes a first pass FM filter, a first stop FM filter, a second pass FM filter, and a second stop FM filter; the first end of the first pass FM filter and the first end of the first stop FM filter are connected with a first identification/configuration pin in the peripheral interface, the first end of the second pass FM filter and the first end of the second stop FM filter are connected with a second identification/configuration pin in the peripheral interface, and the first reserved pin and the second reserved pin are used for being connected with a microphone, a left sound channel output end or a right sound channel output end in a digital earphone connected to the peripheral interface.

Namely, two groups of filters are respectively connected with two CC pins (identification/configuration pins), and FM signals received by the wired earphone as an FM antenna are received from the CC pins, so that the FM function of the electronic equipment is realized. Because two groups of filters are arranged, FM signal transmission and non-FM signal transmission can be transmitted to the corresponding demodulator for processing no matter the wired earphone is positively connected or reversely connected with the peripheral interface of the electronic equipment.

In addition, the reserved pin is connected with the microphone, the left channel output end or the right channel output end in the digital earphone, so that the earphone wire between the microphone, the left channel output end or the right channel output end in the digital earphone and the reserved pin is fully and effectively utilized, the functions of receiving FM signals and processing FM signals by electronic equipment are realized, and the cost of an FM antenna built in the electronic equipment such as a mobile phone is saved.

In a possible implementation of the first aspect, the at least one pin includes a first identification/configuration pin and a second identification/configuration pin that are connected to each other, the FM transmission control circuit includes a first pass FM filter and a first block FM filter, wherein a first end of the first pass FM filter and a first end of the first block FM filter are connected to the first identification/configuration pin and the second identification/configuration pin that are connected to each other, and the first reserved pin and the second reserved pin are used to connect to a microphone, a left channel output terminal, or a right channel output terminal in a digital headset connected to the peripheral interface.

Namely, two CC pins in the peripheral interface of the electronic equipment are connected, so that only one group of filters is used, and the problem that the FM function can be realized by the forward and reverse insertion of the earphone is solved.

In a possible implementation of the first aspect, the electronic device further includes an identification chip, configured to identify a type of the device connected to the peripheral interface; and is

And the second end of the first FM blocking filter and/or the second end of the second FM blocking filter are/is connected with the identification chip so as to prevent the FM signal from entering the identification chip.

In a possible implementation of the first aspect, the electronic device further includes a low-pass filter, where a first end of the low-pass filter is connected to a first identification/configuration pin and a second identification/configuration pin in the peripheral interface, and a second end of the low-pass filter is connected to the identification chip.

In a possible implementation of the first aspect, an identification signal of the signals output by the first identification/configuration pin or the second identification/configuration pin can enter the identification chip through the low-pass filter, and the identification chip can identify a type of a device connected to the peripheral interface based on the identification signal. I.e. here the signal that can pass through the low pass filter is a non-FM signal that is used to identify the type of device.

In a possible implementation of the first aspect, the pass FM filter is a band pass filter, and the stop FM filter is a band stop filter or a magnetic bead.

In a possible implementation of the first aspect, the FM demodulator is an FM demodulation chip.

In one possible implementation of the first aspect, the FM transmission control circuit is located in the peripheral interface.

In one possible implementation of the first aspect, the FM transmission control circuit is located outside the peripheral interface.

In a possible implementation of the first aspect, the peripheral interface is a TYPE-C interface.

In a second aspect, an embodiment of the present application further provides an electronic device, where the electronic device includes a peripheral interface and an FM demodulator; the peripheral interface comprises at least one grounding pin, and an FM transmission control circuit and a switch are arranged corresponding to the peripheral interface, wherein the FM transmission control circuit is respectively connected with at least one grounding pin in the peripheral interface and an FM demodulator; the switch is connected with a grounding pin connected with the FM transmission control circuit, and can be disconnected under the condition that a digital earphone is connected to the peripheral interface, so that an FM signal output by the grounding pin connected with the FM transmission control circuit is input into the FM demodulator through the FM transmission control circuit; and the switch can be closed when a charging wire connector is connected to the peripheral interface, so that a signal output by a grounding pin connected with the FM transmission control circuit flows through the switch to form a charging loop.

In the scheme, when the electronic equipment is charged through the peripheral interface, the switch connected with the grounding pin is closed, so that a larger current loop is ensured during charging. When the electronic equipment receives the FM signal through the earphone, the opening end is disconnected, so that the corresponding current enters the FM demodulation chip through the FM transmission control circuit. Thus, the FM function of the electronic equipment can be realized under the condition of not influencing the charging function of the electronic equipment.

In one possible implementation of the first aspect, the FM transmission control circuit includes a pass FM filter and a stop FM filter; the first end of the pass FM filter is connected with the grounding pin, and the second end of the pass FM filter is connected with the FM demodulator; the first end of the resistance FM filter is connected with the grounding pin, the second end of the resistance FM filter is grounded, and the switch is connected with the resistance FM filter in parallel.

In a possible implementation of the first aspect, the switch includes a triode, a first pole of the triode is connected to the ground pin, a second pole of the triode is grounded, and a third pole of the triode is connected to a power pin, a first identification/configuration pin, and/or a second identification/configuration pin of the peripheral interface.

In a second aspect, embodiments of the present application further provide a wired headset, where the wired headset includes a plurality of remote devices and a plurality of pass FM filters; and under the condition that the wired earphone is connected with the earphone interface of the electronic equipment, the second end of the at least one pass FM filter is connected with at least one pin in the earphone interface of the electronic equipment so as to input FM signals received by the at least one far-end device into the at least one pin of the electronic equipment.

That is, by connecting a pass FM filter to the remote devices such as the microphone and the channel output port of the earphone, the earphone line between the earphone connector and the remote devices can be used as an FM antenna to receive FM signals.

In a possible implementation of the first aspect, in a case where the wired headset is connected to a headset interface of an electronic device, the second end of the at least one pass FM filter is connected to a first identification/configuration pin and/or a second identification/configuration pin in the headset interface of the electronic device.

In one possible implementation of the first aspect, the far-end device includes a microphone, a left channel output, or a right channel output.

In one possible implementation of the first aspect, the wired headset includes a first pass FM filter and a second pass FM filter, where a first end of the first pass FM filter and a first end of the second pass FM filter are respectively connected to any two of the microphone, the left channel output terminal, and the right channel output terminal.

In a possible implementation of the first aspect, the wired headset includes a first pass FM filter, a second pass FM filter, and a third pass FM filter, where a first end of the first pass FM filter, a first end of the second pass FM filter, and a first end of the third pass FM filter are connected to the microphone, the left channel output terminal, and the right channel output terminal, respectively.

In one possible implementation of the first aspect, the pass FM filter is a band pass filter.

Drawings

Fig. 1 shows an example of a TYPE-C interface on a handset 100a according to an embodiment of the present application.

Fig. 2 shows a detailed composition example of the TYPE-C interface according to an embodiment of the present application.

Fig. 3 shows an FM circuit implementation example for TYPE-C analog headphones according to an embodiment of the application.

Figure 4 illustrates an example of a band pass filter circuit according to an embodiment of the present application.

Fig. 5A shows one example of an FM circuit implementation for TYPE-C digital headphones according to an embodiment of the application.

Fig. 5B shows a second example of an FM circuit implementation for TYPE-C digital headphones according to an embodiment of the present application.

Fig. 5C shows a third example of an FM circuit implementation for TYPE-C digital headphones according to an embodiment of the application.

Fig. 5D shows four examples of one FM circuit implementation for TYPE-C digital headphones according to an embodiment of the present application.

Fig. 5E shows five examples of one FM circuit implementation for TYPE-C digital headphones according to an embodiment of the application.

Fig. 5F shows five examples of one FM circuit implementation for TYPE-C digital headphones according to an embodiment of the application.

Fig. 6 shows another FM circuit implementation example for TYPE-C digital headphones according to an embodiment of the application.

Fig. 7 illustrates an example of a switch according to some embodiments of the present application.

Fig. 8A illustrates an FM Application (APP) interface diagram according to an embodiment of the Application.

Fig. 8B illustrates an FM Application (APP) prompt interface diagram according to an embodiment of the present Application.

FIG. 9 illustrates a structural schematic of an example electronic device, according to some embodiments of the present application.

Detailed Description

The following illustrative embodiments of the present application include, but are not limited to, FM enabled electronic devices and wired headsets.

At present, with the lightness and thinness of electronic equipment, the application of peripheral interfaces of the electronic equipment such as a TYPE-C interface is increasingly widespread, and most of the electronic equipment such as a mobile phone, a tablet personal computer and the like adopts the TYPE-C interface as a charging/earphone integrated interface.

Fig. 1 illustrates a typical integrated charging/earphone interface form by taking a mobile phone as an example, and as shown in fig. 1, a first TYPE-C interface 101 is disposed on a side surface of a mobile phone 100a, where the first TYPE-C interface 101 can be used as both a charging interface and an earphone interface, so that the mobile phone 100a does not need to additionally provide a conventional 3.5mm earphone interface. Then, a headset with a second TYPE-C interface 102 corresponding to the first TYPE-C interface 101 (hereinafter referred to as "TYPE-C headset") can be directly inserted into the first TYPE-C interface 101 of the handset 100a to receive a call, play music, and the like through the headset. It can be understood that, in other embodiments, the earphone interface may be a conventional 3.5mm earphone interface, and the earphone is connected to a conversion interface including a TYPE-C interface, so that the earphone has a TYPE-C interface, and can be connected to a mobile phone integrated with a charging/earphone interface, thereby implementing an FM function of the earphone.

An embodiment of the present application is directed to providing an FM circuit implementation scheme for a TYPE-C headset of an electronic device 100 such as the mobile phone 100a shown in fig. 1, so that a user of the electronic device can implement a radio function by using the TYPE-C headset. The FM circuit implementations provided by the various embodiments of the present application may be applied to a variety of electronic devices 100, the electronic devices 100 including, but not limited to: various electronic devices having a TYPE-C interface, such as a mobile phone 100a shown in fig. 1, a personal computer, a laptop computer, a tablet computer, a television, a game machine, a display device, a display screen, a vehicle-mounted terminal, a music player, a home device, an Artificial Intelligence (AI) device, an Augmented Reality (AR) device, a Virtual Reality (VR) device, and the like. In some embodiments, embodiments of the present application may also be applied to wearable devices worn by a user. For example, a smart watch, bracelet, piece of jewelry (e.g., a device made as a decorative item such as an earring, bracelet, or the like) or glasses, or the like, or as part of a watch, bracelet, piece of jewelry or glasses, or the like. An example of the structure of the electronic device will be described in detail later with reference to fig. 9.

In the embodiment of the application, the radio function is realized by respectively arranging a pass FM filter and a stop FM filter at the pin of the TYPE-C interface and taking the earphone cable as an antenna. It will be appreciated that for some types of electronic devices 100, such as the cellular phone 100a, the required length of the FM antenna is typically in the range of 70-80 cm, while the length of the earphone cable is typically 90-100 cm, so that the function of the FM antenna can be implemented by the earphone cable.

The following describes in detail the specific components of the TYPE-C interface in the existing specification to which the present application is applied, with reference to fig. 2.

The TYPE-C interface is a TYPE of USB interface, can collect functions such as charging, data transmission, etc. and compared with the early interfaces (such as TYPE-A interface and TYPE-B interface), the TYPE-C interface has higher data transmission speed and higher power supply capacity. Besides, the Type-A interface is different from the Type-A interface which is mainly used for equipment such as a PC end and a charger, the Type-B interface is mainly used for connecting a 3.5-inch mobile hard disk, a printer, a display and the like, and the Type-C interface is thin and can support thinner and lighter equipment.

The TYPE-C interface is a symmetrical structure, so that the plugging and unplugging and the cable direction are both right and left. Fig. 2 shows a specification pin diagram of an existing TYPE-C interface. Specifically, the TYPE-C interface shown in fig. 2 includes: 4 pairs of TX/RX differential data transmission pins (TX1+/RX1+, TX1-/RX1-, TX2+/RX2+, TX2-/RX 2-); 2 pairs of USB D +/D-pins, a pair of SBU reserved pins (SBU1/SBU2), 2 CC pins, 4 VBUS pins and 4 ground pins.

The ground pins GND (A1, A12, B1 and B12) are used for grounding, the VBUS pins (A4, A9, B4 and B9) are power pins, are used as power receiving pins when receiving charging, are used as power supply pins when supplying power to peripheral equipment, and are mainly used for connecting a charging/power supply circuit.

TX1+ (A2), TX1- (A3), RX2- (A10), RX2+ (A11), TX2+ (B2), TX2- (B3), RX1- (B10) and RX1+ (B11) are differential data transmission pins and are used for data transmission. They can provide up to 2 lanes of an overdrive data link, achieving bi-directional bandwidth up to 20 Gbps. In general, the USB 3.1 standard only uses 2 pairs of TX/RX differential lines as data lines, and is connected with TX1/RX1 in a positive insertion mode and with TX2/RX2 in a reverse insertion mode.

CC1(a5) and CC2(B5) are identification/configuration pins that can be used to determine whether the device is plugged in forward or reverse direction, determine different types of peripherals by detecting different resistance values of the peripherals, configure different modes, and so on.

The D + (A6, B6) and D- (A7, B7) pins are used for transmitting data and being compatible with other USB standards, and can be connected with a main chip of a mainboard of equipment such as a mobile phone.

SBUs 1(a8) and SBUs 2(B8) are reserved pins that may be used for transmitting non-USB signals, for analog audio modes, or for Alternate (Alternate) modes, etc.

An example of a circuit for implementing the FM function of a TYPE-C headset using a pin of a TYPE-C interface of the electronic device 100 according to some embodiments of the present application is described below in conjunction with fig. 3-7.

According to the difference of signal transmission and conversion mode, wired earphones such as Type-C earphones can be divided into analog earphones and digital earphones. According to some embodiments of the present application, for different TYPE-C headsets, different FM transmission control circuit circuits, TYPE-C interfaces, FM demodulators, and/or identification chip coordination ways may be designed to meet FM broadcast reception requirements. The FM transmission control circuit may be a sum-and-sum FM filter of a pass FM filter, the FM demodulator may be an FM demodulation chip, and the identification chip may be a CC demodulation chip, but is not limited thereto.

For analog headphones, in some embodiments of the present application, the headphone is made to implement the FM function of the TYPE-C interface as a receiving antenna for FM signals by connecting an FM filter and a blocking FM filter through the SBU1(a8) pin and/or the SBU2(B8) pin. Under the condition that the analog earphone is inserted into the TYPE-C interface of the electronic equipment 100, the SBU1 pin of the TYPE-C interface is connected with the MIC contact in the analog earphone, the SBU2 pin of the TYPE-C interface is connected with the GND contact in the analog earphone, or the SBU1 pin of the TYPE-C interface is connected with the GND contact in the analog earphone, and the SBU2 pin of the TYPE-C interface is connected with the MIC contact in the analog earphone, so that the MIC/GND signal is just transmitted by the SBU1 pin and the SBU2 pin, the frequency of the signal is far lower than that of the FM signal, and the FM signal and the USB signal can be distinguished by the SBU1 pin and the SBU2 pin with frequency band difference, thereby realizing the FM function. The FM-pass filter is an arbitrary circuit having a function of passing an FM signal, and is not limited to the above name, and may be a FM-pass filter circuit. The FM blocking filter is any circuit having a function of blocking passage of FM signals, and is not limited to the above name, and may be a FM blocking filter circuit.

In addition, since the pin connections of the SBU1(a8) and SBU2(B8) reserved in the TYPE-C interface 310 are grounded, if the FM function is implemented using the SBU1(a8) and SBU2(B8), the entire headphone cable of the analog headphone can be used as an FM antenna. Therefore, for the TYPE-C analog earphone, the FM function is realized by adopting reserved pins SBU1(A8) and SBU2(B8) in the TYPE-C interface. Fig. 3 illustrates an example implementation of an FM circuit for TYPE-C analog headphones, according to some embodiments of the present application.

Specifically, as shown in fig. 3, the electronic device 100 includes a TYPE-C interface 310 and an FM demodulation chip 313. The TYPE-C interface 310 includes pins, pass FM filters 311A and 311B, stop FM filters 312A and 312B, a low pass filter 314, and a CC demodulation chip 315 as shown in fig. 2. It is understood that in other embodiments, the pass FM filters 311A and 311B, the block FM filters 312A and 312B, the low pass filter 314, and the CC demodulation chip 315 may be located not only in the TYPE-C interface 310, but also outside the TYPE-C interface 310. Or some of the pass FM filters 311A and 311B, the block FM filters 312A and 312B, and the low pass filter 314 are disposed in the TYPE-C interface 310, and another part of the devices are disposed outside the TYPE-C interface 310. The positional relationships between the FM-pass filters 311A and 311B, FM-block filters 312A and 312B, low-pass filter 314, and CC demodulation chip 315 and the TYPE-C interface 310 in the following embodiments are the same, and are not described again.

The SBU1 pin of the TYPE-C interface 310 is connected to the FM filter 311A and the FM blocking filter 312A, and the SBU2 pin is connected to the FM filter 311B and the FM blocking filter 312B. And the pass FM filter 311A and the pass FM filter 311B are connected to the FM demodulation chip 313, and the stop FM filter 312A and the stop FM filter 312B are connected to the CC demodulation chip 315. The pass FM filters 311A and 311B can propagate FM signals while blocking non-FM signals, and the block FM filters 312A and 312B can block FM signals while transmitting non-FM signals (e.g., CC signals at the CC pin, MIC/GND signals, etc.) in the analog headset 301.

In some embodiments of the present application, the pass FM filters 311A and 311B may be band pass filters whose center frequencies may be designed to be the center frequencies of the FM band and whose passband bandwidths are designed to cover the FM band to pass FM signals. Then, the impedance of the FM signal passing FM filters 311A and 311B to the signal of the frequency band related to the FM signal is small, and the impedance of the signal of the other frequency band is large. For example, typically the FM signal is in a frequency band of about 88-110MHz, and the MIC/GND signal (i.e. the audio signal picked up by the earphone microphone of the analog earphone 301) is in a frequency band of about 20-20KHz, then the pass FM filter 311 can be designed as: the center frequency is 100MHz, the upper cut-off frequency is 115MHz, and the lower cut-off frequency is 85 MHz. Then, the FM signal will pass through the FM filter 311 and propagate to the FM demodulator 313, and signals in other frequency bands, such as MIC/GND signals, will be blocked by the FM filter 311.

For example, the pass FM filters 311A and 311B may be designed using resistors, capacitors, inductors, etc. (e.g., as shown in fig. 4), or using application specific integrated circuits. Fig. 4 shows the structure of a common pass FM filter. As shown in fig. 4, the pass FM filter includes capacitors C1 and C2 and an inductor L1. The capacitors C1 and C2 and the inductor L1 may be sized according to the material tolerance of the devices, the packaging process and the cost of the electronic equipment, for example, the capacitor C1 is 100pF, the capacitor C2 is 1nF, and the inductor L1 is 100 nH. It is understood that the capacitors C1 and C2 and the inductor L1 may take other values. In addition, the pass FM filter herein may also have other structures, for example, consisting of one capacitor and two inductors, which is not limited herein.

Further, in some embodiments of the present application, the FM rejection filters 312A and 312B may be band rejection filters, the center frequency of which may be designed to be the center frequency of the FM band, and the stopband bandwidth designed to cover the FM band. Then, the impedance of the FM signals of the relevant frequency band of the FM signals will be relatively large by the FM blocking filters 312A and 312B, and the impedance of the signals of other frequency bands will be relatively small. For example, in the case where the FM signal is in the frequency band of 88-110MHz and the MIC/GND signal is in the frequency band of 20-20KHz, the FM blocking filters 312A and 312B may be designed to: the center frequency is 100MHz, the upper cut-off frequency is 115MHz, and the lower cut-off frequency is 85 MHz. Then, the FM signal is blocked from passing through FM blocking filters 312A and 312B, while the MIC/GND signal passes through FM blocking filters 312A and 312B and propagates to CC demodulating chip 315, and CC demodulating chip 315 transmits the MIC/GND signal to the corresponding processor of the electronic device for processing. Similar to the band pass filter, the band stop filter may be designed using a resistor, a capacitor, an inductor, or the like, or may be directly designed using a dedicated IC.

In other embodiments of the present application, the FM blocking filters 312A and 312B may also be low pass filters to block higher frequency FM signals and allow lower frequency MIC/GND signals to pass. For example, in some embodiments, the FM blocking filters 312A and 312B shown in fig. 3 may be magnetic beads, which have higher resistivity and permeability and are equivalent to a resistor and an inductor connected in series, but both the resistance and the inductance change with frequency, and the magnetic beads exhibit resistance at high frequency and can maintain higher impedance in a wider frequency range, so that the higher frequency FM signals can be effectively filtered and the lower frequency MIC/GND signals can be passed through by selecting magnetic beads with suitable parameters.

It is understood that in other embodiments of the present application, in the electronic device 100, the SBU1(a8) and SBU2(B8) pins in the TYPE-C interface 310 may also be generally connected to a microphone signal processing circuit of the main board of the electronic device 100 to transmit MIC/GND signals (i.e., audio signals picked up by the earphone microphone of the analog earphone 301) after detecting that the analog earphone is connected.

The FM demodulation chip 313 is configured to demodulate the received FM signal. In some embodiments of the present application, the FM demodulation chip may be any chip capable of demodulating FM signals, which may be located in a wireless communication module (such as wireless communication module 160 in fig. 9, below) such as the mobile phone 100 a.

One end of the low-pass filter 314 is connected to the CC1(a5) and CC2(B5) pins, and the other end of the low-pass filter 314 is connected to the CC demodulation chip 315, where the CC signal is a signal of the CC pin. The CC demodulation chip can identify the TYPE of the external device inserted into the TYPE-C interface 310, such as whether the inserted external device is a headphone, a USB connection line, or a speaker, and can identify whether the inserted headphone is an analog headphone or a digital headphone, according to the CC signal. The identification of the analog and digital headsets will be described in more detail below. In some embodiments of the present application, the CC demodulation chip may be a Power transfer Protocol (PD) chip in TYPE-C interface.

With continued reference to fig. 3, the analog headset 301 includes a detection circuit, when the analog headset 301 is plugged into the TYPE-C interface of the electronic device 100, the detection circuit can cooperate with the related devices (e.g., CC interface, CC demodulation chip 315) in the TYPE-C interface 310 of the electronic device 100 to detect that the peripheral plugged into the TYPE-C interface 310 is the analog headset. The detection circuit may include DET1 and DET2 and a switch n.o., among others. One end of the DET1 is connected to one end of the switch n.o., the other end of the DET1 is used to connect to the CC1 pin of the TYPE-C interface 310, the other end of the switch n.o. is connected to one end of the DET2, and the other end of the DET2 is grounded.

The related devices in the TYPE-C interface 310 may include a low pass filter 314, a CC1 pin and a CC2 pin, and the low pass filter 314 may be connected to the CC1 pin and the CC2 pin to implement a function of detecting that the peripheral plugged into the TYPE-C interface 310 is an analog headset.

The working principle of implementing the FM function based on the embodiment shown in fig. 3 is described below.

With the pass FM filter and the block FM filter shown in fig. 3, when FM signals need to be listened to, the FM signals will be transmitted to the FM demodulation chip 313 in the electronic device through the pass FM filter 311A or 311B to be processed by calling the corresponding FM Application (APP) of the software layer of the electronic device 100 with the headphone cord as an antenna, and then played out through a speaker or a headphone, so that the user can listen to the FM radio. When the microphone function of the analog earphone 301 needs to be used, the MIC/GND signal collected by the analog earphone 301 may be transmitted to the CC demodulation chip 315 in the electronic device through the FM blocking filter 312A or 312B, and then transmitted to the corresponding audio processing module for processing, so as to implement the sound pickup function. Thus, the scheme shown in FIG. 3 may enable the FM function without affecting the transmission of the MIC/GND signal.

Specifically, when the electronic device 100 calls a corresponding FM Application (APP) of the software layer, for example, as shown in fig. 8A, the user clicks the FM Application (APP) on the display screen of the electronic device 100, and if the earphone is not inserted into the TYPE-C interface 310 at this time, the user may be prompted to insert the earphone, for example, as shown in fig. 8B, a prompt message 802 "the radio function needs to be implemented by inserting a wired earphone, please insert a wired earphone" is displayed on the display screen of the electronic device 100 to prompt the user to insert the earphone, and the user clicks the confirmation control 803 or inserts the wired earphone, so that the prompt message 802 may disappear. After the analog headset 301 has been plugged into the TYPE-C interface 310 of the electronic device 100, the electronic device 100 may determine the TYPE of the accessed peripheral through the CC1(a5) pin. Specifically, taking the CC1(a5) pin as an example, when the analog headset 301 is plugged into the TYPE-C interface 310 of the electronic device 100, the switch NO between the DET1 and the DET2 at the end of the analog headset 301 is closed, so that the CC1 pin (a5) in the TYPE-C interface 310 is grounded, and the electronic device 100 may determine that the plugged peripheral is the analog headset 301 through the grounding of the CC1(a5) pin.

After detecting the analog earphone 301 inserted into the TYPE-C interface 310, the electronic device 100 may enter a frequency modulation operating state, and then control the electronic device 100 to receive the FM signal collected through the analog earphone 301. After entering the pin SBU1 or SBU2 of the TYPE-C interface 310, the FM signal enters the FM demodulation chip 313 through the FM filter 311A or 311B for processing, and then is played out through a speaker or a headphone, so that the user can listen to the FM radio. While FM blocking filters 312A and 312B may block FM signals from entering CC demodulation chip 315, thereby reducing loss of FM signals.

Meanwhile, when the microphone function of the analog headset 301 needs to be used, the MIC/GND signal collected by the analog headset 301 is blocked by the pass FM filter 311A or 311B, and can be transmitted to the electronic device through the block FM filter 312A or 312B for processing, so as to implement the sound pickup function.

When the analog earphone 301 receives an FM signal, the FM signal enters the FM demodulation chip 313 through the FM pass filter 311A or 311B for demodulation processing due to the presence of the FM stop filters 312A and 312B, and does not shunt into the CC demodulation chip 315, so that the transmission quality of the FM signal is ensured. In addition, MIC/GND signals collected by the analog headset 301 may enter the CC demodulation chip 315 through the FM blocking filters 312A and 312B, and then be transmitted to the corresponding audio processing modules for processing. Thus, the scheme shown in FIG. 3 can be implemented to implement the FM function without affecting the transmission of the transmitted MIC/GND signal.

In the example shown in fig. 3, the pins SBU1(a8) and SBU2(B8) in the TYPE-C interface are respectively connected to a set of filters (i.e., pass FM filter 311A and block FM filter 312A, pass FM filter 311B and block FM filter 312B) to ensure that the headset can filter signals regardless of the forward insertion and reverse insertion, and in this scheme, only a filter circuit needs to be added to the electronic device 100, and no modification needs to be made to the headset end, so that the universality is high. Furthermore, it is understood that in other embodiments of the present application, a set of filters may be connected to SBU1(a8) or SBU2(B8) only, and when the insertion of the analog headset 301 into the TYPE-C interface 310 is reversed, the user may be prompted on the screen of the electronic device to switch the headset direction and then reinsert the analog headset 301.

The FM circuit implementation for TYPE-C analog headphones is described above in connection with fig. 3, and the FM circuit implementation for TYPE-C digital headphones is described below in connection with fig. 5A-7.

For the digital earphone, the FM signal and the non-FM signal transmitted simultaneously with the analog earphone may have different frequency overlaps, and the TYPE-C interface may be selected to use the earphone line as a pin of the antenna to implement the FM function, for example, the FM function may be implemented by a CC pin and a GND pin.

Fig. 5A to 5E show examples of various schemes for implementing the FM function by connecting a pass FM filter and a block FM filter to the CC pin of the TYPE-C interface and using the TYPE-C digital headset as an FM antenna, and fig. 6 shows examples of various schemes for implementing the FM function by connecting a pass FM filter and a block FM filter to the GND pin of the TYPE-C interface and using the TYPE-C digital headset as an FM antenna.

In the scheme shown in fig. 5A, the FM function is implemented using the headphone cable as an FM antenna by connecting a set of filters to the CC1(a5) pin and the CC2(B5) pin in the TYPE-C interface 510 of the electronic device 100, respectively, and providing a right channel output HPR to which the digital headphone 520 is connected through the FM filter 501 on the digital headphone 520 side.

Specifically, as shown in fig. 5A, the electronic device 100 includes a TYPE-C interface 510 and an FM demodulation chip 513. TYPE-C interface 510 is shown in fig. 2 as pins, pass FM filters 511A and 511B, block FM filters 512A and 512B, low pass filter 514, and CC demodulation chip 515.

Pin CC1 of TYPE-C interface 510 connects FM filter 511A and FM blocking filter 512A, and pin CC2 connects FM filter 511B and FM blocking filter 512B. And the pass FM filter 511A and the pass FM filter 511B are connected to the FM demodulation chip 513, and the stop FM filter 512A and the stop FM filter 512B are connected to the CC demodulation chip 515. The pass FM filters 511A and 511B can propagate FM signals while blocking non-FM signals, and the block FM filters 512A and 512B can block FM signals while transmitting non-FM signals (e.g., CC signals at the CC pin, MIC/GND signals, etc.) in the digital headset 520.

The FM demodulation chip 513 demodulates the received FM signal. In some embodiments of the present application, the FM demodulation chip may be any chip capable of demodulating FM signals, which may be located in a wireless communication module (such as wireless communication module 160 in fig. 9, below) such as the mobile phone 100 a.

One end of the low-pass filter 514 is connected to the CC1(a5) and CC2(B5) pins, and the other end of the low-pass filter 514 is connected to the CC demodulation chip 515, where the CC signal is the signal of the CC pin. The CC demodulation chip can identify the TYPE of the external device inserted into the TYPE-C interface 310, such as whether the inserted external device is a headphone, a USB connection line, or a speaker, and can identify whether the inserted headphone is an analog headphone or a digital headphone, according to the CC signal. The identification of the analog and digital headsets will be described in more detail below. In some embodiments of the present application, the CC demodulation chip may be a Power transfer Protocol (PD) chip in TYPE-C interface.

With continued reference to fig. 5A, the digital headset 520 includes a right channel output HPR, a left channel output HPL, a pass FM filter 501, a Codec chip, a USB to I2S chip, a power supply circuit 524, a switch 523, a microphone, headset function control keys, and the like. Here, the pass FM filter 501 may be the same as or similar to the pass FM filter 511A or 511B on the electronic apparatus 100 side, one end of the pass FM filter 501 is connected to CC1(a5) or CC2(B5) (whether one end of the pass FM filter 501 is connected to CC1(a5) or CC2(B5) depends on the insertion direction of the digital headphone 520, only the case of connecting CC1(a5) is shown in fig. 5A), and the other end is connected to the right channel output HPR of the digital headphone 520, so as to fully utilize the length of the headphone cord as an FM antenna.

The Codec chip is used for coding and compressing the transmission of audio and video digital signals and decoding the signals at a receiving end.

The USB to I2S chip is used for connecting the earphone and the electronic equipment through a data line to transmit data bit by bit.

The microphone is used for converting a sound signal into an electric signal.

The earphone function control key is used for realizing the control of the player by the line control earphone, for example, the earphone key has the following functions besides the function of hanging up a telephone, namely, the function of adjusting the volume, and can increase or reduce the sound; a song switching function which can skip to the next or previous song; pause, play function, etc.

Based on the above structure, the FM-passing filters 511A, 511B and 501 can propagate FM signals and block non-FM signals, i.e., allow FM signals to pass into the FM demodulation chip 513, while the FM-blocking filters 512A and 512B can block FM signals and transmit non-FM signals (such as CC signals of CC pins, MIC/GND signals, etc.) in the digital headphone 520 into the CC demodulation chip 514. Thus, the scheme shown in fig. 5A utilizes the CC pin of the TYPE-C interface, and can implement the FM function by using the earphone cable of the digital earphone 520 as the FM antenna without affecting the transmission of the CC signal.

Similar to the pass FM filters shown in fig. 3, the pass FM filters 511A, 511B, and 501 may be band pass filters, the center frequencies of the pass FM filters 511A, 511B, and 501 may be designed to be the center frequencies of the FM band, and the pass band bandwidths may be designed to cover the FM band. Then, the impedance of the FM signal passing FM filters 511A, 511B and 501 to the signal of the frequency band related to the FM signal is small, and the impedance of the signal of the other frequency bands is large. For example, in general, the FM signal is in a frequency band of about 88-110MHz, and the CC signal is in a frequency band of about 12-13Hz, so similar to the embodiment shown in fig. 3, the FM-pass filters 511A, 511B and 501 can be designed as follows: the center frequency is 100MHz, the upper cut-off frequency is 115MHz, and the lower cut-off frequency is 85 MHz. Then, the FM signal will smoothly pass through the FM-pass filter 501 and the FM-pass filter 511A or 511B and propagate to the FM demodulation chip 513, but the FM signal is blocked by the FM-block filter 512A or 512B and cannot continue to propagate to the inside of the electronic device 100, so that the FM signal is transmitted to the FM demodulation chip 513 to the maximum extent, the loss of the FM signal transmitted to the CC demodulation chip 515 inside the electronic device 100 is reduced, and the transmission quality of the FM signal is ensured.

The functions of the FM-pass filters 511A, 511B and 501 may be implemented by the circuit shown in fig. 4, and specifically, reference may be made to the above description of fig. 4, and details are not repeated here.

In addition, in some embodiments of the present application, the FM blocking filter 512A or 512B shown in fig. 5A may also be the FM blocking filter 312A or 312B shown in fig. 3. For example, FM blocker filter 512A or 512B may be a band blocker filter (e.g., the center frequency of FM blocker filter 512A or 512B is designed to be the center frequency of the FM band and the stopband bandwidth is designed to cover the FM band); alternatively, the FM blocking filter 512A or 512B may be a low pass filter (e.g., beads as described above) to block higher frequency FM signals and allow lower frequency CC signals to pass. The FM blocking filter 512A or 512B may be designed using resistors, capacitors, inductors, etc., or may be a dedicated IC.

The operation of the embodiment shown in fig. 5A for implementing FM functions is described below.

With the pass FM filter and the block FM filter shown in fig. 5A, when FM signals need to be listened to, the FM signals are processed by the FM demodulation chip 513 transmitted to the electronic device through the pass FM filter 501 and 511A or 511B by calling the corresponding FM Application (APP) of the software layer of the electronic device 100 with the headphone cord as an antenna, and then played out through a speaker or a headphone, so that the user can listen to the FM radio. When the microphone function of the digital headset 520 is needed, the MIC/GND signal collected by the digital headset 520 may be transmitted to the CC demodulation chip 515 in the electronic device through the FM blocking filter 512A or 512B, and then transmitted to the corresponding audio processing module for processing, so as to implement the sound pickup function. Thus, the scheme shown in FIG. 5A may enable the FM function without affecting the transmission of the MIC/GND signal.

Specifically, when the electronic device 100 calls a corresponding FM Application (APP) of the software layer, if an earphone is not inserted into the TYPE-C interface 510 at this time, the user may be prompted to insert the earphone, for example, as shown in fig. 8, a prompt message "the radio function needs to be implemented by inserting a wired earphone, please insert a wired earphone" is displayed on the display screen of the electronic device 100 to prompt the user to insert the earphone. After the digital headset 520 has been plugged into the TYPE-C interface 510 of the electronic device 100, the electronic device 100 can determine the TYPE of the accessed peripheral through the CC pin. For example, taking the CC1(a5) pin as an example, first, after the digital earphone 520 is inserted into the TYPE-C interface 510 of the electronic device 100, the electronic device 100 will detect a 5.1K Ω resistance through the CC1(a5) pin of the TYPE-C interface 510, then VBUS (a4) will supply power to the digital earphone 520, and after the power is supplied to the USB to I2s chip 522 through the power supply circuit 524 of the digital earphone 520, the GPIO pin of the USB to I2s chip 522 will output a high level, so that the MOS 523 in fig. 5A is turned on, then the CC1(a5) pin port of the TYPE-C interface 510 will be directly grounded, and the electronic device 100 can thus determine that the peripheral connected to the TYPE-C interface 510 is a digital earphone. In addition, it can be understood that since the manufacturers of each electronic device or TYPE-C interface do not have the same practice, the TYPE of the accessed earphone can be determined according to actual conditions, except that the TYPE of the accessed earphone is determined to be a digital earphone according to the fact that the CC1 is changed from 5.1K Ω to 0 Ω, the TYPE of the earphone can be directly determined to be a digital earphone according to the fact that the ground resistance of the CC1 pin is 5.1K Ω after the earphone is directly inserted into the TYPE-C interface.

After detecting that the digital earphone 520 inserted into the TYPE-C interface 510 is inserted, the electronic device 100 enters a frequency modulation operating state, and the electronic device 100 is controlled to receive an FM signal transmitted by the digital earphone 520, the FM signal enters the pin CC1 or CC2 in the TYPE-C interface 510 through the FM-passing filter 501, then is transmitted to the FM demodulation chip 513 in the electronic device 100 through the FM-passing filter 511A or 511B for processing, and finally is played out through a speaker or an earphone, so that a user can listen to an FM radio. And the FM blocking filters 512A and 512B may block FM signals from entering the CC demodulation chip 315, thereby reducing loss of FM signals.

Meanwhile, when the microphone function of the digital headset 520 is required to be used, the MIC/GND signal of the digital headset 520 is blocked by the pass FM filter 511A or 511B, and may be transmitted to the electronic device through the block FM filter 512A or 512B to be processed, so as to implement a sound pickup function.

When the digital headphone 520 receives the FM signal, the FM signal enters the FM demodulation chip 513 through the FM pass filter 511A or 511B to be demodulated, and does not flow into the CC demodulation chip 515 due to the presence of the FM block filters 512A and 512B, so that the transmission quality of the FM signal is ensured. In addition, the MIC/GND signal of the digital headset 520 may enter the CC demodulation chip 515 through the FM blocking filters 512A and 512B, and then be transmitted to the corresponding audio processing module for processing. Thus, the scheme shown in FIG. 5A may enable the FM function without affecting the transmission of the transmitted MIC/GND signal.

Furthermore, in the example shown in fig. 5A, CC1(a5) and CC2(B5) in the TYPE-C interface are connected to one set of filters (one set of filters includes pass FM filter 511A and block FM filter 512A, and the other set includes pass FM filter 511B and block FM filter 512B), respectively, to ensure that the headset is able to filter signals regardless of the forward and reverse insertions, i.e., the scheme shown in fig. 5A requires two sets of filters in total. However, in other embodiments of the present application, only one set of filters may be connected to CC1 or CC2, and when the digital headset 520 is plugged into the TYPE-C interface 510 in reverse, the user may be prompted on the screen of the electronic device to switch headset orientations and then reinsert the digital headset 520.

In addition, in the example shown in fig. 5A, the FM filter 501 is connected to the right channel output HPR of the digital headphone 520, so that the length of the headphone cable corresponding to the HPR is fully utilized, and the headphone cable is used as an FM antenna to realize the FM function. In the embodiment shown in fig. 5B, on the digital headphone 520 side, the other end of the FM filter 501 is connected to the left channel output HPL of the digital headphone 520, and the headphone cable corresponding to the HPL is used as the FM antenna to implement the FM function. The other structures and functions of fig. 5B are similar to those of fig. 5A, and are not described again here.

Furthermore, in the example shown in fig. 5A, CC1(a5) and CC2(B5) in the TYPE-C interface are connected to one set of filters (one set of filters includes pass FM filter 511A and block FM filter 512A, and the other set includes pass FM filter 511B and block FM filter 512B), respectively, to ensure that the headset is able to filter signals regardless of the forward and reverse insertions, i.e., the scheme shown in fig. 5A requires two sets of filters in total. However, in some embodiments, CC1(a5) and CC2(B5) are typically connected together on the motherboard of electronic device 100, and therefore, only one set of filters may be directly connected after CC1(a5) and CC2(B5) are connected together, as shown in fig. 5C, which also ensures that digital headset 520 is able to filter signals regardless of the insertion and reverse insertion. Fig. 5C is similar to the other structure of fig. 5A, and is not described again here.

Likewise, for the example of fig. 5B, only one set of filters may be directly connected after CC1(a5) and CC2(B5) are connected together, as shown in fig. 5D, which also ensures that digital headset 520 is able to filter signals regardless of positive and negative insertion. Fig. 5D is similar to the other structures of fig. 5B, and is not repeated here.

Since the length of the earphone line can be fully used as the FM antenna after connecting with the microphone 525 of the digital earphone 520, in the embodiment shown in fig. 5E, the FM function is realized by setting one end of the FM filter 501 to be connected with the microphone 525. Since fig. 5E is different from fig. 5A only in that one end of the FM filter 501 is not connected to the channel output terminal of the digital headphone 520, but connected to the microphone 525, and other structures are similar, they are not described again.

Further, in other embodiments, unlike the scheme shown in fig. 5E, when the FM function is implemented using the microphone 525, it is also possible to connect only one set of filters directly after the CC1(a5) and the CC2(B5) are connected together, that is, similar to fig. 5C and 5D.

Further, unlike the embodiments shown in fig. 5A to 5E, the antenna function of the earphone may also be implemented by simultaneously connecting at least two of the right channel output terminal HPR, the left channel output terminal HPL, and the microphone 525. For example, fig. 5F shows a circuit that receives FM signals through the right channel output HPR, the left channel output HPL, and the microphone 525 at the same time. Specifically, in the scheme shown in fig. 5F, the FM function of the digital headphone 520 is implemented by connecting the right channel output HPR of the digital headphone 520 to the pass FM filter 501a, connecting the left channel output HPL of the digital headphone 520 to the pass FM filter 501b, and connecting the microphone 525 of the digital headphone 520 to the pass FM filter 501 c. It is understood that in other embodiments, the FM function of the digital headset 520 may be implemented by connecting at least one of the right channel output HPR, the left channel output HPL, and the microphone 525 of the digital headset 520 with a corresponding pass FM filter.

The embodiment described above with reference to fig. 5A to 5F provides an FM circuit implementation scheme for the digital TYPE-C earphone, and the FM function can be implemented without affecting the normal function of the conventional TYPE-C digital earphone by only adding filters at the electronic device 100 end and the digital earphone 520 end. However, this solution requires some modifications to the internal circuit of the digital earphone 520 and adds a filter circuit, so that it cannot be compatible with the existing digital TYPE-C earphone. To improve the versatility, another FM implementation for digital headphones is provided below in conjunction with fig. 6.

As shown in fig. 6, after the digital earphone 620 is inserted into the TYPE-C interface 610 of the electronic device 100, the electronic device 100 may determine, through the CC pin of the TYPE-C interface 610, that the peripheral device accessing the TYPE-C interface 610 is the digital earphone, which is similar to the process and structure described above with reference to fig. 5A and is not described again here.

Unlike the embodiment shown in fig. 5A to 5E, in the scheme shown in fig. 6, the GND (B1) pin in the TYPE-C interface 610 is utilized to implement the FM function of the digital headset 620, and in this scheme, only the electronic device 100 side needs to be designed without any modification to the existing TYPE-C headset.

In the scheme shown in fig. 6, the FM function is implemented using the earphone line as an FM antenna by connecting a set of filters and switches 613 through the GND (B1) pin in the TYPE-C interface 610 of the electronic device 100.

Specifically, as shown in fig. 6, the electronic device 100 includes a TYPE-C interface 510 and an FM demodulation chip 513. The TYPE-C interface 510 includes pins, a pass FM filter 611, a stop FM filter 612, a switch 613, an FM demodulation chip 614, a low pass filter 615, and a CC demodulation chip 616 shown in fig. 2.

The GND (B1) pin of the TYPE-C interface 610 connects the FM filter 611, the FM blocking filter 612, and the switch 613, the FM passing filter 611 can propagate FM signals but block non-FM signals, and the FM blocking filter 612 can block FM signals but transmit non-FM signals (e.g., CC signals at the CC pin, MIC/GND signals, etc.) in the digital headset 620.

The FM demodulation chip 614 is used to demodulate the received FM signal. In some embodiments of the present application, the FM demodulation chip may be any chip capable of demodulating FM signals, which may be located in a wireless communication module (such as wireless communication module 160 in fig. 9, below) such as the mobile phone 100 a.

One end of the low-pass filter 615 is connected to the CC1(a5) and CC2(B5) pins, and the other end of the low-pass filter 615 is connected to the CC demodulation chip 616, where the CC signal is a signal of the CC pin. The CC demodulation chip can identify the TYPE of the external device inserted into the TYPE-C interface 310, such as whether the inserted external device is a headphone, a USB connection line, or a speaker, and can identify whether the inserted headphone is an analog headphone or a digital headphone, according to the CC signal. The identification of the analog and digital headsets will be described in more detail below. In some embodiments of the present application, the CC demodulation chip may be a Power transfer Protocol (PD) chip in TYPE-C interface.

One end of the switch 613 is connected to a pin CC1(a5), and the other end of the switch 613 is grounded.

According to some embodiments of the present application, the switch 613 may be implemented by using a MOS transistor, as shown in fig. 7. The S pole (source) of the MOS tube 701 is connected with a GND pin (B1) of the TYPE-C interface 610, the D pole (drain) is grounded, the G pole (gate) is connected with the resistor 702 and a CC1/CC2 pin (A5/B5) of the TYPE-C interface 610, and the other end of the resistor 702 is connected with a VBUS pin (A4/A9/B4/B9) of the TYPE-C interface 610.

Further, it is to be noted that, in the scheme shown in fig. 6, the pass FM filter 611, the block FM filter 612 and the switch 613 are connected to the B1 pin as an example, and in various embodiments, the pass FM filter 611, the block FM filter 612 and the switch 613 may be connected to any one of the pins a1, a12, B1 and B12. In practice, the pins a1, a12, B1 and B12 are usually connected together, so there is no substantial difference between the connection of the pass FM filter 611, the block FM filter 612 and the switch 613 to any one pin.

The switch 613 shown in fig. 7 is described as an example, and in a different embodiment, another switch may be used as long as the above-described function can be achieved.

When the digital headset 620 is used, the electronic device 100 supplies power to the digital headset 620 through the VBUS and GND pins, and supply current flows from the VBUS to the digital headset 620 and then flows back into the electronic device 100 through the FM blocking filter 612.

When the TYPE-C interface 610 is used to charge the electronic device 100, it is also necessary to charge through the VBUS and GND pins, and the charging current flows to the electronic device 100 through the VBUS pin and then flows back to the charger through the GND pin. However, if the charging current is also flown back and forth through the FM blocking filter 612, the charging efficiency is affected because the FM blocking filter 612 blocks a part of the current, which makes it difficult for the loop to pass a large current, and therefore, in order to ensure the charging efficiency of the electronic device 100, in the scheme provided in fig. 6, in addition to the FM passing filter 611 and the FM blocking filter 612, the switch 613 is connected to the GND pin (B1) to ensure a large current loop during charging. Switch 613 may be used to close when electronic device 100 is charging, making GND pin (B1) directly grounded to ensure a large current to pass through; and is disconnected when the digital headset 620 is inserted so that the corresponding current passes through the pass FM filter 611 and/or the block FM filter 612.

When the digital earphone 620 is plugged into the TYPE-C interface 610, as described above, the CC1/CC2 pin (A5/B5) of the TYPE-C interface 610 will be grounded, i.e., the G pole of the MOS transistor 701 will be directly grounded, the MOS transistor 701 will be turned off, and the current flowing through the GND pin (B1) of the TYPE-C interface 610 will pass through the block FM filter 612 and/or the pass FM filter 611.

When the peripheral inserted into the electronic device 100 is determined to be a non-earphone, that is, the pin CC1/CC2 (a5/B5) is floating, the G pole of the MOS transistor 701 is connected to the VBUS (a4/a9/B4/B9) of the TYPE-C interface 610 through the resistor 702, that is, a high level is connected, then the MOS transistor 701 is turned on, the S pole and the D pole are connected, and the GND pin (B1) of the TYPE-C interface 610 is directly grounded.

Then, with the above-described structure shown in fig. 7, the switch 613 is opened when the electronic device 100 is charged, so that the charging current loop passes through the switch to ensure that a large current passes through; when the digital earphone 620 is inserted, the switch 613 is turned off, so that the earphone power supply current loop flows back through the FM filter 612, and the FM signal is transmitted to the FM demodulation chip 613 through the FM filter 611, thereby implementing the FM function without affecting the charging of the electronic device 100.

The function of the pass FM filter 611 and the block FM filter 612 in fig. 6 is similar to that in fig. 3 to 5E, the pass FM filter 611 may allow FM signals to pass, and the block FM filter 612 may block FM signals. Also, similarly, in some embodiments, the pass FM filter 611 shown in fig. 6 may be a band pass filter, the center frequency of which may be designed to be the center frequency of the FM band, and the passband bandwidth of which is designed to cover the FM band. Then, the impedance of the FM signal passing FM filter 611 to the signal of the frequency band related to the FM signal is small, and the impedance of the signal of the other frequency band is large. While for the FM blocker filter 612, in some embodiments, the FM blocker filter 612 may be a band blocker filter (e.g., the center frequency of the FM blocker filter 612 is designed to be the center frequency of the FM band and the stopband bandwidth is designed to cover the FM band); in other embodiments, the FM blocking filter 612 may also be a low pass filter (e.g., beads as described above) to block higher frequency FM signals. The pass FM filter 611 and the block FM filter 612 may be designed using resistors, capacitors, inductors, etc., or using a dedicated IC.

The operation principle shown in fig. 6, the electronic device 100 controls the electronic device 100 to listen to the FM signal transmitted by the digital earphone 620 when the electronic device 100 is determined to be in the FM operation state by calling the corresponding FM APP of the software layer, the FM signal is processed by the FM demodulation chip 613 transmitted to the electronic device 100 through the FM filter 611, and so on, so that the user can listen to the FM radio.

In the scheme shown in fig. 6, the GND pin in the TYPE-C interface 610 is used to implement the FM function of the digital headset 620, and only the electronic device 100 side needs to be modified without changing the existing headset, so that the universality is stronger.

It is to be understood that although in the above embodiments of the present application, the pass FM filter, the block FM filter, the switch, the low pass filter, and the CC demodulation chip are located inside the TYPE-C interface, in other embodiments of the present application, one or more or all of these components may also be located outside the TYPE-C interface, and are not limited herein. In addition, although the FM demodulation chip in the above embodiment is located in the TYPE-C interface, in other embodiments of the present application, these devices may also be located outside the TYPE-C interface, which is not limited herein. However, the CC demodulation chip 616 may be disposed not only in the TYPE-C interface 510, but also outside the TYPE-C interface 510, which is not limited herein.

An example of the structure of the electronic device 100 according to an embodiment of the present application is described below with reference to fig. 9.

As shown in fig. 9, the electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identity Module (SIM) card interface 195, and the like. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It is to be understood that the illustrated structure of the embodiment of the present invention does not specifically limit the electronic device 100. In other embodiments of the present application, electronic device 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units, such as: the processor 110 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processing units may be separate devices or may be integrated into one or more processors.

The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a USB Type C interface. The USB interface 130 may be used to connect a charger to charge the electronic device 100, and may also be used to connect an earphone to receive an FM signal transmitted from the earphone, and the USB Type C interface is matched with the internal components of the earphone and the FM filter, the FM blocking filter, and the FM demodulation chip in the electronic device as shown in fig. 3, fig. 5A to fig. 5E, and fig. 6, so as to implement the FM function of the electronic device. The interface may also be used to connect other electronic devices, such as AR devices and the like.

It should be understood that the connection relationship between the modules according to the embodiment of the present invention is only illustrative, and is not limited to the structure of the electronic device 100. In other embodiments of the present application, the electronic device 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charging management module 140 is configured to receive charging input from a charger. The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140, and supplies power to the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like.

The wireless communication function of the electronic device 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The

antennas

1 and 2 are used for transmitting and receiving electromagnetic wave signals.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied to the electronic device 100.

The wireless communication module 160 may provide a solution for wireless communication applied to the electronic device 100, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (bluetooth, BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), Infrared (IR), and the like. The frequency modulation can be realized by the pass FM filter, the stop FM filter and the FM demodulation chip. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, perform frequency modulation and amplification on the signal, and convert the signal into electromagnetic waves through the antenna 2 to radiate the electromagnetic waves.

The electronic device 100 implements display functions via the GPU, the display screen 194, and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 194 is used for displaying images, videos, text messages and the like, for example, when the electronic device calls a corresponding FM Application (APP) of the software layer, if an earphone is not inserted into the TYPE-C interface at this time, a prompt message "the radio function can be implemented only when you insert a wired earphone, please insert a wired earphone" is displayed on the display screen of the electronic device to prompt a user to insert an earphone. In other real-time modes, if only one set of filters is connected to CC1 or CC2, the digital headset can be re-inserted after the user is prompted on the screen of the electronic device to switch the headset direction when the digital headset is inserted into the TYPE-C interface in reverse.

In some embodiments, the electronic device 100 may include 1 or N display screens 194, with N being a positive integer greater than 1.

The electronic device 100 may implement a shooting function through the ISP, the camera 193, the video codec, the GPU, the display 194, the application processor, and the like.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 100.

The internal memory 121 may be used to store computer-executable program code, which includes instructions. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, phone book, etc.) created during use of the electronic device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like. The processor 110 executes various functional applications of the electronic device 100 and data processing by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The electronic device 100 may implement audio functions via the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone interface 170D, and the application processor. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or some functional modules of the audio module 170 may be disposed in the processor 110. The audio module 170 is configured to process the received FM signal.

The speaker 170A, also called a "horn", is used to convert the audio electrical signal into an acoustic signal. The electronic apparatus 100 can listen to music through the speaker 170A or listen to a handsfree call. For example, FM signals are transmitted to an FM demodulation chip in the electronic device through an earphone side-pass FM filter and an electronic device side-pass FM filter, processed, and then played out through a speaker or an earphone to enable a user to listen to an FM radio.

The receiver 170B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. When the electronic apparatus 100 receives a call or voice information, it can receive voice by placing the receiver 170B close to the ear of the person.

The microphone 170C, also referred to as a "microphone," is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can input a voice signal to the microphone 170C by speaking the user's mouth near the microphone 170C.

The headphone interface 170D is used to connect a wired headphone. The earphone interface 170D may be the USB interface 130, and specifically may be a USB Type C interface.

The keys 190 include a power-on key, a volume key, and the like. The motor 191 may generate a vibration cue. Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc. The SIM card interface 195 is used to connect a SIM card.

It will be understood that, although the terms "first", "second", etc. may be used herein to describe various features, these features should not be limited by these terms. These terms are used merely for distinguishing and are not intended to indicate or imply relative importance. For example, a first feature may be termed a second feature, and, similarly, a second feature may be termed a first feature, without departing from the scope of example embodiments.

Moreover, various operations will be described as multiple operations separate from one another in a manner that is most helpful in understanding the illustrative embodiments; however, the order of description should not be construed as to imply that these operations are necessarily order dependent, and that many of the operations can be performed in parallel, concurrently, or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when the described operations are completed, but may have additional operations not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.

References in the specification to "one embodiment," "an illustrative embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may or may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature is described in connection with a particular embodiment, the knowledge of one skilled in the art can affect such feature in combination with other embodiments, whether or not such embodiments are explicitly described.

The terms "comprising," "having," and "including" are synonymous, unless the context dictates otherwise. The phrase "A/B" means "A or B". The phrase "A and/or B" means "(A), (B) or (A and B)".

As used herein, the term "module" may refer to, be a part of, or include: memory (shared, dedicated, or group) for executing one or more software or firmware programs, an Application Specific Integrated Circuit (ASIC), an electronic circuit and/or processor (shared, dedicated, or group), a combinational logic circuit, and/or other suitable components that provide the described functionality.

In the drawings, some features of the structures or methods may be shown in a particular arrangement and/or order. However, it should be understood that such specific arrangement and/or ordering is not required. Rather, in some embodiments, these features may be described in a manner and/or order different from that shown in the illustrative figures. Additionally, the inclusion of a structural or methodical feature in a particular figure does not imply that all embodiments need to include such feature, and in some embodiments may not include such feature, or may be combined with other features.

While the embodiments of the present application have been described in detail with reference to the accompanying drawings, the application of the present application is not limited to the various applications mentioned in the embodiments of the present application, and various structures and modifications can be easily implemented with reference to the present application to achieve various advantageous effects mentioned herein. Variations that do not depart from the gist of the disclosure are intended to be within the scope of the disclosure.

Claims

1. An electronic device comprising a peripheral interface and an FM demodulator;

the peripheral interface comprises a plurality of pins and an FM transmission control circuit is arranged corresponding to the peripheral interface, wherein the FM transmission control circuit is respectively connected with at least one pin of the plurality of pins and the FM demodulator, and

and the pin connected with the FM transmission control circuit is used for receiving FM signals and inputting the received FM signals into the FM demodulator through the FM transmission control circuit.

2. The electronic device of claim 1, wherein the pin connected to the FM transmission control circuit is configured to connect to a remote device or a ground point in a wired headset connected to the peripheral interface to receive FM signals through an FM antenna and input the received FM signals to the FM demodulator through the FM transmission control circuit, wherein the FM demodulator is configured to receive FM signals from the FM antenna and to output the received FM signals to the FM demodulator through the FM transmission control circuit

The FM antenna comprises an earphone connector of a wired earphone connected to the peripheral interface and at least a part of an earphone wire.

3. The electronic device of claim 1, wherein the FM transmission control circuit comprises a block FM filter, a pass FM filter;

the first end of the through FM filter is connected with the at least one pin in the peripheral interface, and the second end of the through FM filter is connected with the FM demodulator so as to transmit FM signals in signals output by the at least one pin to the FM demodulator;

the first end of the FM blocking filter and the at least one pin of the peripheral interface are used for preventing FM signals in signals output by the at least one pin from passing through the FM blocking filter.

4. The electronic device of claim 3, wherein the at least one pin comprises a first reserved pin and a second reserved pin, and wherein the FM transmission control circuitry comprises a first pass FM filter and a first block FM filter, a second pass FM filter and a second block FM filter; wherein the content of the first and second substances,

the first end of the first pass FM filter and the first end of the first stop FM filter are connected with a first reserved pin in the peripheral interface, the first end of the second pass FM filter and the first end of the second stop FM filter are connected with a second reserved pin in the peripheral interface, and

the first reserved pin is used for being connected with a microphone in an analog earphone connected to the peripheral interface, and the second reserved pin is used for being connected with a grounding point of the analog earphone connected to the peripheral interface.

5. The electronic device of claim 3, wherein the at least one pin comprises a first identification/configuration pin and a second identification/configuration pin, and wherein the FM transmission control circuitry comprises a first pass FM filter and a first block FM filter, a second pass FM filter and a second block FM filter; wherein the content of the first and second substances,

the first end of the first pass FM filter and the first end of the first stop FM filter are connected with a first identification/configuration pin in the peripheral interface, the first end of the second pass FM filter and the first end of the second stop FM filter are connected with a second identification/configuration pin in the peripheral interface, and

the first identification/configuration pin and the second identification/configuration pin are used for being connected with a microphone, a left channel output end or a right channel output end in a digital earphone connected to the peripheral interface.

6. The electronic device of claim 3, wherein the at least one pin comprises a first identification/configuration pin and a first identification/configuration pin that are connected to each other, wherein the FM transmission control circuit comprises a first pass FM filter and a first block FM filter, wherein,

the first terminal of the first pass FM filter and the first terminal of the first block FM filter are connected to the first identification/configuration pin and the second identification/configuration pin which are connected to each other, and

the first identification/configuration pin and the first identification/configuration pin are used for being connected with a microphone, a left channel output end or a right channel output end in a digital earphone connected to the peripheral interface.

7. The electronic device of any one of claims 4-6, further comprising an identification chip to identify a type of device connected to the peripheral interface; and is

8. The electronic device of claim 7, further comprising a low pass filter, wherein a first end of the low pass filter is connected to a first identification/configuration pin and a second identification/configuration pin of the peripheral interface, and a second end of the low pass filter is connected to the identification chip.

9. The electronic device of claim 8, wherein an identification signal of the signals output by the first or second identification/configuration pins is capable of entering the identification chip through the low pass filter, and the identification chip is capable of identifying a type of device connected to the peripheral interface based on the identification signal.

10. The electronic device of claim 3, wherein the pass FM filter is a band pass filter and the block FM filter is a band reject filter or a magnetic bead.

11. The electronic device of claim 1, wherein the FM demodulator is an FM demodulation chip.

12. The electronic device of claim 1, wherein the FM transmission control circuit is located in the peripheral interface.

13. The electronic device of claim 1, wherein the FM transmission control circuit is located external to the peripheral interface.

14. The electronic device of any of claims 1-13, wherein the peripheral interface is a TYPE-C interface.

15. An electronic device, comprising a peripheral interface, an FM demodulator;

the peripheral interface comprises at least one grounding pin, and an FM transmission control circuit and a switch are arranged corresponding to the peripheral interface, wherein,

the FM transmission control circuit is respectively connected with at least one grounding pin in the peripheral interface and the FM demodulator;

the switch is connected to a ground pin connected to the FM transmission control circuit, and

the switch can be disconnected under the condition that a digital earphone is connected to the peripheral interface, so that an FM signal output by a grounding pin connected with the FM transmission control circuit is input into the FM demodulator through the FM transmission control circuit; and is

The switch can be closed when a charging wire connector is connected to the peripheral interface, so that a signal output by a grounding pin connected with the FM transmission control circuit flows through the switch to form a charging loop.

16. The electronic device of claim 15, wherein the FM transmission control circuit comprises a pass FM filter, a block FM filter; wherein

The first end of the pass FM filter is connected with the grounding pin, and the second end of the pass FM filter is connected with the FM demodulator;

the first end of the resistance FM filter is connected with the grounding pin, the second end of the resistance FM filter is grounded, and the switch is connected with the resistance FM filter in parallel.

17. The electronic device of claim 15, wherein the switch comprises a transistor, a first pole of the transistor is coupled to the ground pin, a second pole of the transistor is coupled to ground, and a third pole of the transistor is coupled to a power pin, a first identification/configuration pin, and/or a second identification/configuration pin of the peripheral interface.

18. The electronic device of claim 16, wherein the pass FM filter is a band pass filter and the block FM filter is a band stop filter or a magnetic bead.

19. The electronic device of claim 15, wherein the peripheral interface is a TYPE-C interface.

20. The electronic device of claim 15, wherein the FM transmission control circuit is located in the peripheral interface.

21. The electronic device of claim 15, wherein the FM transmission control circuit is located external to the peripheral interface.

22. A wired headset, comprising a plurality of remote devices and a plurality of pass FM filters;

a first end of at least one of the plurality of pass FM filters is connected to at least one of the plurality of remote devices, and

under the condition that the wired earphone is connected with an earphone interface of the electronic equipment, the second end of the at least one pass FM filter is connected with at least one pin in the earphone interface of the electronic equipment, so that the FM signal received by the at least one remote device is input into the at least one pin of the electronic equipment.

23. The wired headset of claim 22, wherein in the case that the wired headset is connected to a headset interface of an electronic device, the second end of the at least one pass FM filter is connected to the first identification/configuration pin and/or the second identification/configuration pin in the headset interface of the electronic device.

24. The wired headset of claim 22, wherein the remote device comprises a microphone, a left channel output, or a right channel output.

25. The wired headset of claim 24, comprising a first pass FM filter and a second pass FM filter, wherein the first pass FM filter first end and the second pass FM filter first end are connected to any two of the microphone, the left channel output, and the right channel output, respectively.

26. The wired earphone of claim 24, wherein the wired earphone comprises a first pass FM filter, a second pass FM filter, and a third pass FM filter, wherein the first pass FM filter first end, the first end of the second pass FM filter, and the first end of the third pass FM filter are connected to the microphone, the left channel output, and the right channel output, respectively.

27. A wired earphone according to any of claims 22-26, characterized in that the pass FM filter is a band pass filter.