CN110166867A - Digital earphone and electric terminal - Google Patents

Abstract

The present invention provides a digital earphone and an electronic terminal. The digital earphone includes a first communication interface, an audio codec, a loudspeaker, a microphone, and an FM antenna. The first communication interface receives digital audio from the electronic terminal when it is connected to the electronic terminal. stream signal, the audio codec converts the digital audio stream signal received through the first communication interface into an analog audio signal, and outputs the converted analog audio signal through a speaker, and the microphone collects external sound to generate an analog microphone signal, audio The ground terminal of the codec is connected to the ground terminal of the first communication interface, and the frequency modulation antenna is connected to the terminal for realizing the frequency modulation function of the first communication interface, so as to pass the frequency modulation signal received from the frequency modulation antenna through the first communication interface. terminal output. By adopting the digital earphone and the electronic terminal of the exemplary embodiment of the present invention, the anti-interference capability and channel quality of the FM signal are effectively improved.

Description

Digital headset and electronic terminal

technical field

The present invention generally relates to the technical field of audio processing, and more specifically, relates to a digital earphone and an electronic terminal supporting a frequency modulation (FM, Frequency Modulation) function.

Background technique

With the continuous update and development of electronic technology, the traditional analog 3.5 mm headphone jack or the analog Universal Serial Bus (USB, Universal Serial Bus) headphone jack on the electronic terminal is being replaced by the digital USB headphone jack. At present, the audio interface on the electronic terminal It is developing in the direction of digital USB interface.

The FM performance of the traditional analog earphone is mainly realized by sharing the ground signal line of the analog earphone, that is, the ground signal line of the earphone is used as the antenna of the FM function of the electronic terminal. As shown in FIG. 1 , the left speaker LEFT, the right speaker RIGHT of the traditional analog earphone and the reference GND1 ground signal line of the microphone MIC1 also have the function of receiving the FM signal by the FM antenna FM ANT.

In this case, an analog switch needs to be set in the electronic terminal to detect whether the earphone is plugged in forwardly or backwardly, so as to realize the correct configuration of the microphone MIC1 signal line and the GND1 ground signal line. For example, take the Type-C interface of an electronic terminal as an example. The A5/B5 terminal of the Type-C interface has a ground signal line and a MIC1 signal line. Using the analog switch can make the earphones plugged in forward or backward, and the microphone MIC1 signal The wires can be correctly connected to the MIC signal input terminal of the audio codec (Audio Codec) in the electronic terminal, and the GND1 ground signal wire can be connected to the isolation circuit in the electronic terminal. The isolation circuit in the electronic terminal is used to isolate the FM signal from the ground, avoiding the direct connection of the FM signal to the ground, so as to prevent the FM signal from being interfered by noise.

However, as the audio interface on the electronic terminal gradually uses a digital USB interface, the matching earphone will no longer be a traditional analog earphone, but a digital earphone using a digital USB interface instead.

At present, audio codecs are generally integrated in digital earphones. If the FM antenna and the ground signal line of the earphone are co-wired in the way of analog earphones, not only the isolation circuit is still required, but also the noise amplitude of the earphone ground signal line will increase, which is serious. Affecting FM antenna performance, for example, may lead to a decrease in the number of searched channels, poor voice quality, and a decrease in FM experience for electronic end users.

Contents of the invention

The purpose of the exemplary embodiments of the present invention is to provide a digital earphone and an electronic terminal, so as to overcome at least one of the aforementioned drawbacks.

According to an aspect of an exemplary embodiment of the present invention, a digital headset is provided, including a first communication interface, an audio codec, a speaker, a microphone, and an FM antenna, wherein the first communication interface is connected to an electronic terminal from The electronic terminal receives the digital audio stream signal, the audio codec converts the digital audio stream signal received through the first communication interface into an analog audio signal, and outputs the converted analog audio signal through the speaker, and the microphone collects external sound to generate An analog microphone signal, the audio codec converts the analog microphone signal into a digital microphone audio signal, and outputs it through the first communication interface, the ground terminal of the audio codec is connected to the ground terminal of the first communication interface, and the FM antenna is connected to the first The terminal of the communication interface is used to implement the frequency modulation function, so as to output the frequency modulation signal received from the frequency modulation antenna through the terminal of the first communication interface.

Optionally, the first communication interface may be a Universal Serial Bus Type-C interface.

Optionally, the terminal of the first communication interface for implementing the frequency modulation function may be one of the first ground GND terminal, the second ground GND terminal, and the auxiliary signal SBU terminal of the Universal Serial Bus Type-C interface.

Optionally, the ground terminal of the first communication interface may be one of the first ground GND terminal and the second ground GND terminal of the Universal Serial Bus C-type interface, wherein the ground terminal of the first communication interface is used to realize frequency modulation Functional terminals are different terminals.

Alternatively, the FM antenna can be made from coaxial wire.

Optionally, the position of the FM antenna in the digital headset may be far away from other signal lines in the digital headset.

According to an aspect of an exemplary embodiment of the present invention, an electronic terminal is provided, including a second communication interface, a processor, and an FM receiving module, wherein the data terminal of the second communication interface is connected to the processor, so as to be connected with a digital earphone In the state of sending a digital audio stream signal to a digital earphone or receiving a digital microphone audio signal from a digital earphone, the ground terminal of the second communication interface is grounded, one end of the FM receiving module is connected to the processor, and the other end of the FM receiving module is connected to the second The terminal of the communication interface is used to realize the frequency modulation function, so as to receive the frequency modulation signal from the digital earphone in the state of being connected with the digital earphone.

Optionally, the second communication interface may be a Universal Serial Bus Type-C interface.

Optionally, the terminal for implementing the frequency modulation function of the second communication interface may be one of the first ground GND terminal, the second ground GND terminal, and the auxiliary signal SBU terminal of the Universal Serial Bus Type-C interface.

Optionally, the ground terminal of the second communication interface may be one of the first ground GND terminal and the second ground GND terminal of the Universal Serial Bus C-type interface, wherein the ground terminal of the second communication interface is used to realize frequency modulation Functional terminals are different terminals.

In the digital earphone and the electronic terminal according to the exemplary embodiment of the present invention, an independent FM antenna circuit is designed on the digital earphone side, and the FM carrier signal collected by the FM antenna is directly fed back to the FM receiving module of the electronic terminal. There is no need to set additional analog switching switches and isolation circuits, which effectively avoids the negative impact on FM performance caused by the obvious noise generated by the ground signal line in the digital earphone when the audio codec on the digital earphone side is working.

Additional aspects and/or advantages of the present general inventive concept will be partially set forth in the following description, and some will be clear from the description, or can be learned through practice of the present general inventive concept.

Description of drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings exemplarily showing the embodiments, in which:

Fig. 1 shows the structural block diagram of existing analog digital earphone and corresponding electronic terminal;

Fig. 2 shows a structural block diagram of a digital headset according to an exemplary embodiment of the present invention;

FIG. 3 shows a schematic diagram of a port of a USB Type-C interface on the digital earphone side according to an exemplary embodiment of the present invention;

Fig. 4 shows a schematic diagram of connection between an electronic terminal and a digital headset according to an exemplary embodiment of the present invention;

FIG. 5 shows a schematic diagram of ports of a Universal Serial Bus C-type interface on the electronic terminal side according to an exemplary embodiment of the present invention;

Fig. 6 shows a schematic diagram of terminal wiring of a USB Type-C interface on the electronic terminal side according to an exemplary embodiment of the present invention.

Detailed ways

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

The digital earphone in the exemplary embodiment of the present invention is a digital earphone integrated with an Audio Codec (audio codec). The structure of the digital earphone in the exemplary embodiment of the present invention will be described below with reference to FIG. 2 .

FIG. 2 shows a structural block diagram of a digital headset according to an exemplary embodiment of the present invention.

As shown in Figure 2, a digital earphone 100 according to an exemplary embodiment of the present invention includes a first communication interface 11, an audio codec 12, a loudspeaker 13, a microphone 14 and an FM antenna 15, and as an example, the loudspeaker 13 may include a left loudspeaker 131 and right speaker 132.

Specifically, the first communication interface 11 receives a digital audio stream signal from the electronic terminal 200 in a state of being connected to the electronic terminal 200 .

The audio codec 12 converts the digital audio stream signal received through the first communication interface 11 into an analog audio signal, and outputs the converted analog audio signal through the speaker 13 .

For example, the audio codec 12 may convert left channel signals (LEFT+ and LEFT-) and right channel signals (RIGHT+ and RIGHT-) to be output through the left speaker 131 and the right speaker 132, respectively.

The microphone 14 picks up external sound to generate an analog microphone signal (MIC signal).

The audio codec 12 converts the analog microphone signal into a digital microphone audio signal, and outputs it through the first communication interface 11 .

Here, the audio codec 12 may refer to a device or a computer program capable of encoding or decoding a digital audio stream. For example, audio codec 12 may refer to a separate device capable of encoding analog audio to digital audio and decoding digital audio to analog audio. In other words, the audio codec 12 may include an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) running at the same clock to implement the aforementioned codec functions.

In a preferred embodiment, the first communication interface 11 may be a Universal Serial Bus Type-C interface, ie, a USB Type-C interface. Fig. 3 shows a schematic diagram of ports of a USB Type-C interface on a digital earphone side according to an exemplary embodiment of the present invention. In the example shown in FIG. 3 , the USB Type-C interface on the digital earphone side is a USB Type-C plug, that is, a USB Type-C plug (also called a USB Type-C male). But it should be understood that the present invention is not limited thereto, and the USB-C type interface on the digital earphone side can also be a USB-C type socket, only the USB-C type interface on the digital earphone side and the universal serial bus on the electronic terminal side are required. The serial bus type C interface can be matched to realize the connection.

As shown in Figure 3, the USB Type-C plug has a total of 24 terminals, which can be inserted forward or backward, and the transmission speed is fast, and the interface has no directionality, which can avoid wrong insertion during use and effectively reduce the failure rate.

The A1 (B1) GND terminal and A12 (B12) GND terminal in the USB Type-C plug are ground GND terminals. A2TX1+(B2TX2+), A3TX1-(B3TX2-) are data transmitters, A10RX2-(B10RX1-), A11RX2+(B11RX1+) are data receivers, used to transmit TX/RX two sets of differential signals.

The A4 (B4) VBUS terminal and the A9 (B9) VBUS terminal in the USB Type-C plug are terminals for bus power supply. The A5CC1 (B5CC2) terminal is a detection terminal, for example, it can be used to detect the connection to distinguish between positive and reverse insertion; it can also be used to configure the interface mode to determine whether the interface is currently used as a charging interface, data interface, digital headphone interface or video output interface .

The A6 (B6) D+ terminal and the A7 (B7) D- terminal in the USB Type-C plug are terminals for compatibility with conventional USB standards. For example, the D+ terminal and the D− terminal used for data transmission are a pair of differential signal terminals compatible with the USB2.0 standard. The A8SBU1 (B8SBU1) terminal in the USB Type-C plug is the auxiliary signal SBU (Side Band Use) terminal.

For the case where the first communication interface 11 is a USB Type-C interface, the D+ terminal and the D- terminal for transmitting data of the USB Type-C interface receive a digital microphone audio signal from the audio codec 12 or send the audio signal to the audio codec 12 Send a digital audio stream signal.

That is to say, the D+ terminal and the D- terminal receive the digital audio stream signal from the electronic terminal 200 and send it to the audio codec 12, and the D+ terminal and the D- terminal also receive the digital microphone audio signal from the audio codec 12, and output to the electronic terminal 200.

Preferably, the digital audio stream signal may include a digital multimedia audio stream signal and a digital voice audio stream signal during a phone call.

The ground terminal of the audio codec 12 is connected to the ground terminal of the first communication interface 11 .

For the case where the first communication interface 11 is a USB Type-C interface, the ground terminal of the first communication interface 11 may be one of the first ground GND terminal and the second ground GND terminal of the Universal Serial Bus Type-C interface.

Taking Figure 3 as an example, the first ground GND terminal can refer to one of the A1 (B1) GND terminal and A12 (B12) GND terminal of the USB Type-C plug, and the second ground GND terminal can refer to the USB Type-C plug The other one of the A1 (B1) GND terminal and the A12 (B12) GND terminal.

The frequency modulation antenna 15 is connected to the terminal of the first communication interface 11 for realizing the frequency modulation function, so as to output the frequency modulation signal received from the frequency modulation antenna 15 through the terminal of the first communication interface 11 for realizing the frequency modulation function.

That is to say, the FM antenna 15 receives the FM signal and sends it to the terminal of the first communication interface 11 for implementing the FM function for output.

For the case where the first communication interface 11 is a USB Type-C interface, the terminals used to realize the frequency modulation function of the first communication interface 11 can be the first grounding GND terminal, the second grounding GND terminal, One of the auxiliary signal SBU terminals.

Taking FIG. 3 as an example, the auxiliary signal SBU terminal may refer to the A8SBU1 (B8SBU2) terminal in the USB Type-C plug. It should be understood that the ground terminal of the first communication interface 11 used to connect to the ground terminal of the audio codec 12 is different from the terminal used to realize the FM function (ie, the terminal connected to the FM antenna 15 ).

In an exemplary embodiment of the present invention, the FM function of the digital earphone is realized by selecting the first ground GND terminal, the second ground GND terminal and/or the auxiliary signal SBU terminal in the USB Type-C interface. This is because when the existing digital earphones using the digital USB interface are connected to the electronic terminal, the first grounding GND terminal and the second grounding GND terminal do not need to work at the same time, and one of the two can be connected to the ground of the digital earphone. The signal SBU terminal is generally used for water vapor/water mist detection. When the existing digital earphone is connected to the electronic terminal, this terminal does not work.

That is to say, in the exemplary embodiment of the present invention, an independent FM antenna circuit is designed on the digital earphone side, and the FM antenna circuit is connected to the FM antenna circuit to realize the FM function by using the terminal that is vacant when the existing digital earphone is connected to the electronic terminal. In this way, the above-mentioned FM antenna circuit can be matched with the existing USB Type-C interface without changing the structure of the existing USB Type-C interface, and can also make the digital earphone according to the exemplary embodiment of the present invention applicable to various An electronic terminal with a USB Type-C interface. In other words, various electronic terminals with a USB Type-C interface can be matched with the digital earphone according to the exemplary embodiment of the present invention.

In addition, in the exemplary embodiment of the present invention, the audio codec 12 may also be powered by the following manner.

For example, when the first communication interface 11 is connected to the electronic terminal 200 and the electronic terminal 200 is turned on, it receives a power signal from the electronic terminal 200 to provide power for the audio codec 12 .

For the case where the first communication interface is a USB Type-C interface, the VBUS terminal of the USB Type-C interface used for bus power supply receives a power signal from the electronic terminal 200 .

Taking FIG. 3 as an example, the VBUS terminal used for bus power supply may refer to the A4 (B4) VBUS terminal or the A9 (B9) VBUS terminal in the USB Type-C plug.

It should be understood that the electronic terminal 200 should have a USB-C interface corresponding to the USB-C interface on the digital earphone side, so as to realize the connection between the two.

As an example, when the digital earphone 100 is connected to the electronic terminal 200 and the electronic terminal 200 is powered on, the electronic terminal 200 uses the VBUS terminal for bus power supply of the Universal Serial Bus C-type interface via the Universal Serial Bus C on the digital earphone side. The VBUS terminal of the type interface used for bus power supply always provides power supply voltage to the digital headset 100 .

In the exemplary embodiment of the present invention, a kind of digital earphone supporting FM function is proposed, and the FM function of the digital earphone is realized by using an independent FM antenna design circuit on the digital earphone, and the anti-interference ability of the FM channel is effectively improved and channel quality.

In addition, in order to obtain better FM performance and reduce interference to the FM antenna, materials with good shielding performance and good anti-interference performance can be selected to make the FM antenna in the design of the digital earphone 100 . In a preferred embodiment, a coaxial cable can be used to make the FM antenna 15 .

In addition, the interference to the FM antenna can also be reduced by designing the arrangement of various signal lines in the digital earphone 100 . For example, the FM antenna 15 in the digital headset 100 can be arranged away from other signal lines (eg, ground signal lines, power signal lines, data signal lines, etc.) in the digital headset 100 .

According to another aspect of the exemplary embodiment of the present invention, there is also provided an electronic terminal, which is an electronic terminal matching the digital earphone shown in FIG. 2 above, that is, the electronic terminal has a first communication interface The corresponding second communication interface is used for connecting with the first communication interface. The following describes the structure of the electronic terminal and the interaction between the electronic terminal and the digital headset with reference to FIG. 4 .

Fig. 4 shows a schematic diagram of connection between an electronic terminal and a digital headset according to an exemplary embodiment of the present invention. As an example, the electronic terminal may be an electronic device such as a smart phone, a tablet computer, a notebook computer, a personal digital assistant, a game machine, etc., which has a communication interface matching the above-mentioned digital headset.

As shown in FIG. 4 , an electronic terminal 200 according to an exemplary embodiment of the present invention includes a second communication interface 21 , a processor 22 and an FM receiving module 23 .

Specifically, the data terminal of the second communication interface 21 is connected to the processor 22 to send a digital audio stream signal to the digital earphone or receive a digital microphone audio signal from the digital earphone when connected to the digital earphone.

In a preferred embodiment, the second communication interface 21 may be a Universal Serial Bus Type-C interface, ie, a USB Type-C interface. Fig. 5 shows a schematic diagram of a port of a USB Type-C interface on the electronic terminal side according to an exemplary embodiment of the present invention. In the example shown in FIG. 5 , the USB Type-C interface on the digital earphone side is a USB Type-C socket, that is, a USB Type-C socket (also called a USB Type-C female plug). But it should be understood that the present invention is not limited thereto, and the USB C-type interface on the electronic terminal side can also be a USB C-type plug, only the USB C-type interface on the digital earphone side and the universal serial bus C-type interface on the electronic terminal side The serial bus type C interface can be matched to realize the connection.

As shown in Figure 5, the USB Type-C socket has a total of 24 terminals, which can be inserted forward or backward, and the transmission speed is fast, and the interface has no directionality.

The A1 (B1) GND terminal and A12 (B12) GND terminal in the USB Type-C socket are ground GND terminals. A2TX1+(B2TX2+), A3TX1-(B3TX2-) are data transmitters, A10RX2-(B10RX1-), A11RX2+(B11RX1+) are data receivers, used to transmit TX/RX two sets of differential signals.

The A4 (B4) VBUS terminal and the A9 (B9) VBUS terminal in the USB Type-C socket are terminals for bus power supply. The A5CC1 (B5CC2) terminal is a detection terminal, for example, it can be used to detect the connection to distinguish between positive and reverse insertion; it can also be used to configure the interface mode to determine whether the interface is currently used as a charging interface, data interface, digital headphone interface or video output interface .

The A6(B6)D+ terminal and A7(B7)D- terminal in the USB Type-C receptacle are terminals for compatibility with conventional USB standards. For example, the D+ terminal and the D− terminal used for data transmission are a pair of differential signal terminals compatible with the USB2.0 standard. The A8SBU1 (B8SBU1) terminal in the USB Type-C socket is the auxiliary signal SBU terminal.

For the case where the second communication interface 21 is a USB Type-C interface, the data terminals of the second communication interface 21 may be the D+ terminal and D- terminal of the Universal Serial Bus Type-C interface for data transmission.

That is to say, the D+ terminal and the D− terminal of the second communication interface 21 receive digital microphone audio signals from the digital headset 100 or send digital audio stream signals to the digital headset 100 when connected to the digital headset 100 .

The ground terminal of the second communication interface 21 is grounded.

For the case where the second communication interface 21 is a USB Type-C interface, the ground terminal of the second communication interface 21 can be one of the first ground GND terminal and the second ground GND terminal of the Universal Serial Bus Type-C interface.

Taking Figure 5 as an example, the first ground GND terminal can refer to one of the A1 (B1) GND terminal and A12 (B12) GND terminal of the USB Type-C socket, and the second ground GND terminal can refer to the USB Type-C socket The other one of the A1 (B1) GND terminal and the A12 (B12) GND terminal.

One end of the FM receiving module 23 is connected to the processor 22, and the other end of the FM receiving module 23 is connected to the terminal for realizing the FM function of the second communication interface 21, to receive from the digital earphone 100 in the state connected with the digital earphone 100. FM signal.

That is to say, the FM antenna 15 in the digital earphone 100 receives the FM signal, and outputs it to the terminal of the second communication interface 21 for realizing the FM function through the terminal of the first communication interface 11 for realizing the FM function, so that the received The FM signal is directly transmitted to the FM receiving module 23.

For the case where the second communication interface 21 is a USB Type-C interface, the terminals used to realize the frequency modulation function of the second communication interface 21 can be the first grounding GND terminal, the second grounding GND terminal, One of the auxiliary signal SBU terminals.

Taking FIG. 5 as an example, the auxiliary signal SBU terminal may refer to the A8SBU1 (B8SBU2) terminal in the USB Type-C socket. It should be understood that the ground terminal of the second communication interface 21 is different from the terminal used to realize the frequency modulation function.

In an exemplary embodiment of the present invention, the FM function of the electronic terminal is realized by selecting the first ground GND terminal, the second ground GND terminal and/or the auxiliary signal SBU terminal in the USB Type-C interface. This is due to the fact that the first ground GND terminal and the second ground GND terminal do not need to work at the same time when the existing digital earphones using the digital USB interface are connected to the electronic terminal, and one of the two is used to receive the GND1/FM ANT signal from the digital earphone That is (refer to FIG. 1 ), the auxiliary signal SBU terminal is generally used for water vapor/water mist detection, and this terminal does not work when the existing digital earphone is connected to the electronic terminal.

That is to say, in the exemplary embodiment of the present invention, the FM function is realized by using the vacant terminal when the existing digital earphone is connected to the electronic terminal, without changing the structure of the existing USB Type-C interface.

Preferably, in the exemplary embodiment of the present invention, the electronic terminal 200 can also provide power to the outside through the second communication interface 21 . In this case, the electronic terminal 200 according to an exemplary embodiment of the present invention may further include a power management module 24 .

For example, one end of the power management module 24 is connected to the processor 22, and the other end of the power management module 24 is connected to the power terminal of the second communication interface 21, so that when the digital headset 100 is connected and the electronic terminal 200 is powered on, the second The power terminal of the second communication interface 21 outputs a power signal.

For the case where the second communication interface 21 is a USB Type-C interface, the power terminal of the second communication interface 21 may be a VBUS terminal of a Universal Serial Bus Type-C interface for bus power supply.

Taking FIG. 5 as an example, the VBUS terminal used for bus power supply may refer to the A4 (B4) VBUS terminal or the A9 (B9) VBUS terminal in the USB Type-C socket.

As an example, the FM receiving module 23 and/or the power management module 24 may be arranged on a circuit board of the electronic terminal 200 .

Fig. 6 shows a schematic diagram of terminal wiring of a USB Type-C interface on the electronic terminal side according to an exemplary embodiment of the present invention.

In the example shown in Figure 6, taking the Universal Serial Bus Type-C interface on the electronic terminal side as a USB Type-C socket as an example, the first GND terminal of A1/B1 of the USB Type-C socket can be used as the ground terminal directly Ground, use the second GND terminal of A12/B12 of the USB Type-C socket as the terminal for realizing the FM function, so as to receive the FM signal from the digital earphone.

It should be understood that FIG. 6 only shows the connection modes of the ground terminal of the USB Type-C socket and the terminal for realizing the frequency modulation function, and the connection modes of other terminals are not listed one by one. In addition, the wiring method of the ground terminal and the terminal for realizing the frequency modulation function shown in Figure 6 is only an example, and the second GND terminal of A12/B12 of the USB Type-C socket can also be used as the ground terminal, or the The first GND terminal of A1/B1 of the Type-C socket is used as a terminal for realizing the frequency modulation function, or the auxiliary SBU terminal of A8/B8 of the USB Type-C socket is used as a terminal for realizing the frequency modulation function. Those skilled in the art can make a selection according to actual design requirements.

Compared with the existing electronic terminal suitable for analog and digital earphones, the electronic terminal adopting the exemplary embodiment of the present invention does not need additional analog switch and isolation circuit, which saves cost and space.

Using the digital earphone and the electronic terminal of the exemplary embodiment of the present invention provides a low-cost, high-performance new digital earphone FM circuit design for common USB Type-C digital earphones. An independent FM antenna circuit is designed at the digital earphone end, and the FM carrier signal collected by the FM antenna is directly fed back to the FM receiving module, so that no additional isolation circuit is required in the electronic terminal, effectively avoiding the audio codec work at the digital earphone end FM performance can be negatively affected by the apparent noise generated by the digital headphone ground wire.

Adopting the digital earphone and the electronic terminal of the exemplary embodiment of the present invention makes the FM antenna have strong anti-interference ability, high channel quality, and FM performance is better than the traditional 3.5 mm analog-digital earphone or USB Type-C analog-digital earphone.

The exemplary embodiments of the present invention have been described above, and it should be understood that the above description is only exemplary and not exhaustive, and the present invention is not limited to the disclosed exemplary embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the invention. Therefore, the protection scope of the present invention should be determined by the claims.

Claims (10)

1. a kind of digital earphone, which is characterized in that including the first communication interface, audio codec, loudspeaker, microphone and tune Frequency antenna,

Wherein, the first communication interface receives digital audio stream signal from electric terminal in the state of connecting with electric terminal,

Audio codec will be converted to analog audio signal by the received digital audio stream signal of the first communication interface, and will The analog audio signal being converted to is exported by loudspeaker,

Sound outside microphone acquisition, to generate analog microphone signal,

Analog microphone signal is converted to digital microphone audio signal by audio codec, and defeated by the first communication interface Out,

The ground terminal of audio codec is connected to the ground terminal of the first communication interface,

Frequency-modulated antenna is connected to the terminal for realizing frequency modulation function of the first communication interface, will be from the received tune of frequency-modulated antenna Frequency signal is exported by the terminal of the first communication interface.

2. digital earphone as described in claim 1, which is characterized in that the first communication interface is universal serial bus c-type interface.

3. digital earphone as claimed in claim 2, which is characterized in that the end for realizing frequency modulation function of the first communication interface Son is in the first ground connection GND terminal, the second ground connection GND terminal, auxiliary signal SBU terminal of universal serial bus c-type interface One.

4. digital earphone as claimed in claim 3, which is characterized in that the ground terminal of the first communication interface is that general serial is total Line c-type interface first ground connection GND terminal, second ground connection GND terminal in one,

Wherein, the ground terminal of the first communication interface is different terminals from the terminal for realizing frequency modulation function.

5. digital earphone as described in claim 1, which is characterized in that frequency-modulated antenna is made of coaxial line.

6. digital earphone as claimed in claim 5, which is characterized in that the separate number of frequency-modulated antenna position in digital earphone Other signal wires in word earphone.

7. a kind of electric terminal, which is characterized in that including the second communication interface, processor and FM reception module,

Wherein, the data terminal of the second communication interface is connected to processor, in the state of being connect with digital earphone to number Earphone sends digital audio stream signal or receives digital microphone audio signal from digital earphone,

The ground terminal ground of second communication interface,

One end of FM reception module is connected to processor, and the other end of FM reception module is connected to the use of the second communication interface In the terminal for realizing frequency modulation function, to receive FM signal from digital earphone in the state of connecting with digital earphone.

8. electric terminal according to claim 7, which is characterized in that the second communication interface is that universal serial bus c-type connects Mouthful.

9. electric terminal according to claim 8, which is characterized in that the second communication interface for realizing frequency modulation function Terminal is in the first ground connection GND terminal, the second ground connection GND terminal, auxiliary signal SBU terminal of universal serial bus c-type interface One.

10. electric terminal according to claim 9, which is characterized in that the ground terminal of the second communication interface is general string Row bus c-type interface first ground connection GND terminal, second ground connection GND terminal in one,

Wherein, the ground terminal of the second communication interface is different terminals from the terminal for realizing frequency modulation function.