Antenna multiplexing circuit, antenna multiplexing system and electronic equipment

Abstract

The utility model provides an antenna multiplexing circuit, an antenna multiplexing system and electronic equipment, and belongs to the technical field of radio frequency antennas. The antenna multiplexing circuit comprises a first low-pass filtering module, a high-pass filtering module, a second low-pass filtering module and a radio frequency transmitting module, the first end and the second end of the first low-pass filtering module are respectively used for transmitting audio signals, and the third end of the first low-pass filtering module is connected with the first end of the high-pass filtering module and an external audio device through a first audio line; the fourth end of the first low-pass filtering module is respectively connected with the second end of the high-pass filtering module, the signal output end of the radio frequency transmitting module and the first end of the second low-pass filtering module; the second end of the second low-pass filtering module is used for being connected with an audio device. According to the invention, the performance of the radio-frequency signal can be improved under the condition that the occupied space and the cost are considered.

Description

Technical Field

[0001] The present application relates to the field of radio frequency antenna technology, and in particular to an antenna multiplexing circuit, an antenna multiplexing system, and an electronic device. Background Art

[0002] With the rapid development of electronic technology, various electronic devices have become popular in people's work and life. Most electronic devices have display, audio and video, Bluetooth, wireless network and other functions. To ensure the performance of some wireless functions, corresponding RF antennas are generally deployed in electronic devices.

[0003] In related technologies, technicians usually use onboard antennas, external antennas, flexible printed circuit (FPC) antennas, or laser-direct-structuring (LDS) antennas as RF antennas. Specifically, the output end of the wireless signal transmitter in the electronic device can be connected to the RF antenna to increase the strength of the RF signal through the RF antenna.

[0004] However, various antenna solutions mentioned in related technologies all have the problem of high costs. In addition, solutions using FPC antennas, external antennas, and onboard antennas also have the problem of large space requirements. Therefore, how to provide an RF antenna that balances antenna performance, space requirements, and cost is an urgent problem to be solved. Utility Model Content

[0005] The present application aims to provide an antenna duplexing circuit, antenna duplexing system, and electronic device that can simultaneously utilize an audio line transmitting audio signals to an audio device as an antenna for a radio frequency (RF) transmitter module, eliminating the need for a separate RF antenna. This improves RF signal performance while balancing space and cost.

[0006] The embodiment of the present application is implemented as follows:

[0007] According to a first aspect of an embodiment of the present application, an antenna multiplexing circuit is provided, the circuit comprising:

[0008] A first low-pass filtering module, a high-pass filtering module, a second low-pass filtering module and a radio frequency transmitting module;

[0009] The first end and the second end of the first low-pass filter module are respectively used to transmit audio signals, and the third end of the first low-pass filter module is connected to the first end of the high-pass filter module and an external audio device through a first audio line;

[0010] The fourth end of the first low-pass filtering module is connected to the second end of the high-pass filtering module, the signal output end of the RF transmitting module and the first end of the second low-pass filtering module respectively;

[0011] The second end of the second low-pass filter module is used to connect to an audio device;

[0012] The RF transmitting module is used to output a RF signal, the minimum frequency of the RF signal is much greater than the maximum frequency of the audio signal, and the first audio line is used as an antenna for the RF transmitting module;

[0013] The first low-pass filter module is used to filter out high-frequency signals of the radio frequency signal and the audio signal, and transmit the low-frequency signal of the audio signal to the audio device; the second low-pass filter module is used to filter out the radio frequency signal to prevent the radio frequency signal from being input into the audio device through the second low-pass filter module;

[0014] The high-pass filter module is used to filter out the low-frequency signal of the radio frequency signal and the audio signal, and transmit the radio frequency signal to the first audio line and the audio device.

[0015] Optionally, the first low-pass filtering module includes: a first low-pass filtering unit and a second low-pass filtering unit;

[0016] The first end of the first low-pass filter unit is used to transmit the audio signal, and the second end of the first low-pass filter unit is connected to the first end of the high-pass filter module and the audio device respectively through the first audio line;

[0017] The first end of the second low-pass filtering unit is used to transmit the audio signal, and the second end of the second low-pass filtering unit is respectively connected to the second end of the high-pass filtering module, the signal output end of the RF transmitting module and the first end of the second low-pass filtering module.

[0018] Optionally, the first low-pass filtering unit includes a first inductor, and the second low-pass filtering unit includes a second inductor;

[0019] The first end of the first inductor is used to transmit the audio signal, and the second end of the first inductor is connected to the first end of the high-pass filter module and the audio device respectively through the first audio line;

[0020] The first end of the second inductor is used to transmit the audio signal, and the second end of the second inductor is respectively connected to the second end of the high-pass filter module, the signal output end of the RF transmitter module and the first end of the second low-pass filter module.

[0021] Optionally, the first low-pass filtering unit further includes a first magnetic bead, and the second low-pass filtering unit further includes a second magnetic bead;

[0022] The first end of the first magnetic bead is used to transmit the audio signal, and the second end of the first magnetic bead is used to connect to the first end of the first inductor;

[0023] The first end of the second magnetic bead is used to transmit the audio signal, and the second end of the second magnetic bead is used to connect to the first end of the second inductor.

[0024] Optionally, the second low-pass filtering module includes a third inductor;

[0025] The first end of the third inductor is connected to the fourth end of the first low-pass filter module, and the second end of the third inductor is used to connect to an audio device.

[0026] Optionally, the high-pass filtering module includes: a first capacitor;

[0027] The first plate of the first capacitor is connected to the audio device through the first audio line, and the second plate of the first capacitor is connected to the signal output end of the radio frequency transmitting module.

[0028] Optionally, the radio frequency transmission module is a Bluetooth signal transmitter or a wireless network signal transmitter.

[0029] Optionally, the circuit further includes a filtering unit;

[0030] A first end of the filter unit is connected to a first end of the high-pass filter module through the first signal line, and a second end of the filter unit is grounded.

[0031] A second aspect of the embodiments of the present application provides an antenna multiplexing system, the system comprising an audio signal output device, an audio device, and any one of the antenna multiplexing circuits provided in the first aspect above;

[0032] The audio signal output device is used to output audio signals;

[0033] The audio device is used to convert the audio signal into audio and output the audio, and is used to serve as an antenna when receiving the radio frequency signal output by the antenna multiplexing circuit.

[0034] According to a third aspect of the embodiments of the present application, an electronic device is provided, which includes any antenna multiplexing circuit provided in the first aspect or the antenna multiplexing system provided in the second aspect.

[0035] The beneficial effects of the embodiments of the present application include:

[0036] The embodiments of the present application provide a method of configuring a first low-pass filter module, a high-pass filter module, a second low-pass filter module, and a radio frequency transmission module. Specifically, the first end and the second end of the first low-pass filter module are respectively used to transmit audio signals. The third end of the first low-pass filter module is connected to the first end of the high-pass filter module and an external audio device via a first audio cable. The fourth end of the first low-pass filter module is respectively connected to the second end of the high-pass filter module, the signal output end of the radio frequency transmission module, and the first end of the second low-pass filter module. The second end of the second low-pass filter module is used to connect to the audio device.

[0037] The first and second low-pass filtering modules filter or block the RF signal, thereby preventing the RF signal from being transmitted along other paths and causing problems such as degradation of the RF signal's performance. High-frequency signals in the audio signal can also be filtered out to improve the quality of the audio signal.

[0038] By filtering or blocking the audio signal through the high-pass filter module, the audio signal can be prevented from being transmitted along the transmission path of the radio frequency signal or from being unable to be normally transmitted to the audio device. That is, the normal transmission of the audio signal can be ensured.

[0039] In other words, the antenna duplexing circuit ensures the proper transmission of the audio signal while also utilizing the audio line used to transmit the audio signal to the audio device as the RF antenna for the RF transmitter module. This achieves the goal of multiplexing the audio line into an RF antenna, thereby improving RF signal performance. Furthermore, the antenna duplexing circuit prevents interference between the audio and RF signals simply by using low-pass and high-pass filtering modules. This eliminates the need for a separate RF antenna for the RF signal, reducing material costs and eliminating the need for dedicated antenna installation space.

[0040] In this way, the performance of the radio frequency signal can be improved while taking into account the occupied space and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0042] Figure 1 A schematic structural diagram of a first antenna multiplexing circuit provided in an embodiment of the present application;

[0043] Figure 2 A schematic structural diagram of a second antenna multiplexing circuit provided in an embodiment of the present application;

[0044] Figure 3 A schematic structural diagram of a third antenna multiplexing circuit provided in an embodiment of the present application;

[0045] Figure 4 A schematic structural diagram of a fourth antenna multiplexing circuit provided in an embodiment of the present application;

[0046] Figure 5 A schematic structural diagram of an antenna multiplexing system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0050] In the description of this application, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0052] Generally, related technicians will use a board-mounted antenna, an external antenna, an FPC antenna, or an LDS antenna as a radio frequency antenna. Specifically, the output end of the wireless signal transmitter in the electronic device can be connected to the radio frequency antenna to increase the strength of the radio frequency signal through the radio frequency antenna.

[0053] However, the FPC antenna requires carving the antenna shape on the FPC material, which requires a certain height and area; the onboard antenna requires routing the antenna shape on the PCB board, which will also increase the area of ​​the PCB board, and the PCB board needs to be remade when the antenna is modified; the external antenna requires a larger product space and is more expensive; the LDS antenna requires laser engraving to engrave the antenna onto the plastic part, which also requires a relatively high cost.

[0054] Therefore, various antenna solutions mentioned in related technologies all have the problem of high costs. In addition, solutions using FPC antennas, external antennas, and onboard antennas also have the problem of large space requirements. Therefore, how to provide an RF antenna that balances antenna performance, space requirements, and cost is an urgent problem to be solved.

[0055] To this end, an embodiment of the present application provides an antenna multiplexing circuit. The antenna multiplexing circuit includes a first low-pass filter module, a high-pass filter module, a second low-pass filter module, and a radio frequency transmitter module. An audio signal is transmitted to the first and second ends of the first low-pass filter module, respectively. The third end of the first low-pass filter module is connected to the first end of the high-pass filter module and an external audio device via a first audio line. The fourth end of the first low-pass filter module is connected to the second end of the high-pass filter module, the signal output end of the radio frequency transmitter module, and the first end of the second low-pass filter module. The second end of the second low-pass filter module is connected to an audio device. In this way, the first audio line can be used as an antenna for the radio frequency transmitter module, thereby improving the performance of the radio frequency signal while balancing space occupation and cost.

[0056] The embodiments of the present application are described using an antenna multiplexing circuit used in an electronic device as an example, but this does not mean that the embodiments of the present application can only be applied to electronic devices.

[0057] Optionally, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a Bluetooth headset, an augmented reality (AR) device, a virtual reality (VR) device, etc. Generally, it is only necessary to ensure that the electronic device can output audio and radio frequency signals. The embodiments of the present application are not limited to this.

[0058] Generally, if the electronic device is capable of outputting audio, then the electronic device will be provided with a corresponding audio output device and an audio decoding device, and the audio output device and the audio decoding device will be connected by a corresponding audio transmission line to transmit the audio signal output by the audio decoding device to the audio output device and convert it into audio for playback.

[0059] The antenna multiplexing circuit provided in the embodiment of the present application is explained in detail below.

[0060] Figure 1 This is a schematic diagram of the structure of an antenna multiplexing circuit provided by this application, which can be applied to the above electronic equipment. Figure 1 An embodiment of the present application provides an antenna multiplexing circuit 100 , which includes: a first low-pass filtering module 101 , a high-pass filtering module 102 , a second low-pass filtering module 103 and a radio frequency transmitting module 104 .

[0061] The first end and the second end of the first low-pass filter module 101 are respectively used to transmit audio signals. The third end of the first low-pass filter module 101 is connected to the first end of the high-pass filter module 102 and an external audio device through a first audio line P1.

[0062] The fourth end of the first low-pass filtering module 101 is connected to the second end of the high-pass filtering module 102 , the signal output end of the RF transmitting module 104 , and the first end of the second low-pass filtering module 103 , respectively.

[0063] The second end of the second low-pass filter module 103 is used to connect to an audio device.

[0064] The RF transmission module 104 is used to output a RF signal. Specifically, the RF transmission module 104 may output the RF signal to the high-pass filter module 102 .

[0065] The first low-pass filter module 101 is used to filter out the high-frequency signals of the radio frequency signal and the audio signal, and transmit the low-frequency signals of the audio signal to the audio device.

[0066] The second low-pass filter module 103 is used to filter out the radio frequency signal to prevent the radio frequency signal from being input into the audio device through the second low-pass filter module 103 .

[0067] The high-pass filter module 102 is configured to filter out the low-frequency signal of the radio frequency signal and the audio signal, and transmit the radio frequency signal to the first audio line P1 and the audio device.

[0068] Optionally, the first low-pass filtering module 101 and the second low-pass filtering module 103 may be any modules that can filter out high-frequency signals and allow only low-frequency signals to pass through.

[0069] In this embodiment, the frequencies of signals allowed to pass through by the first low-pass filtering module 101 and the second low-pass filtering module 103 can be set according to actual needs.

[0070] For example, the first low-pass filter module 101 is used to transmit audio signals, and the frequency range of the audio signals is generally 20HZ-20KHZ. Therefore, the signal frequency allowed to pass by the first low-pass filter module 101 and the second low-pass filter module 103 can be set to 20HZ-20KHZ.

[0071] Generally, the frequency range of the audio signal may refer to the frequency range when the audio decoding device outputs the audio signal, or may refer to a frequency range expected or preset by a user, which is not limited in the present embodiment.

[0072] Optionally, the RF transmission module 104 may be a Bluetooth signal transmitter or a wireless network signal transmitter, or any other possible device for transmitting other RF signals. Correspondingly, the RF signal may be a Bluetooth signal or a wireless network signal (WI-FI) or other signal, which is not limited in the present embodiment.

[0073] Optionally, the high-pass filtering module 02 may be any module that can filter out low-frequency signals and only allow high-frequency signals to pass through.

[0074] In this embodiment, the signal frequency allowed to pass by the high-pass signal filter module 102 can be set according to actual needs. Specifically, the high-pass filter module 102 is connected to the RF transmitter module 104 to receive the RF signal. Therefore, the signal frequency allowed to pass by the high-pass filter module 102 can be set according to the frequency of the RF signal.

[0075] For another example, if the RF transmission module 104 is a Bluetooth signal transmitter, then the RF signal is a Bluetooth signal, and the frequency range of the RF signal is 2.4 GHZ. Therefore, the signal frequency allowed to pass by the high-pass filter module 102 can be set to 2.35-2.45 GHZ or any other possible frequency range. This embodiment of the present application is not limited to this.

[0076] Generally, the frequency range of the radio frequency signal may refer to the frequency range when the radio frequency transmitting module 104 outputs the radio frequency signal, or may refer to a frequency range expected or preset by a user, which is not limited in the present embodiment.

[0077] It can be seen that the minimum frequency of the RF signal is much greater than the maximum frequency of the audio signal. Moreover, the maximum audio frequency allowed to pass by the first low-pass filter module 101 and the second low-pass filter module 103 is less than the minimum frequency of the RF signal, and the minimum audio frequency allowed to pass by the high-pass filter module 101 is greater than the maximum frequency of the audio signal. In this way, the first low-pass filter module 101, the second low-pass filter module 103, and the high-pass filter module 102 can filter the RF signal and the audio signal respectively to achieve the function of blocking the corresponding signals.

[0078] For example, the maximum frequency of the audio signal is generally 20KHZ, and even the commonly used audio signal is around 3KHZ. However, the frequency of the radio frequency signal is generally in the GHZ level, for example, the frequency of the radio frequency signal can be around 2.4GHZ. Even the minimum frequency of some low-frequency radio frequency signals is generally more than 10 times the maximum frequency of the audio signal.

[0079] That is to say, the minimum frequency of the RF signal is much greater than the maximum frequency of the audio signal. Specifically, the minimum frequency of the RF signal is at least 10 times the maximum frequency of the audio signal, or even up to 10 times. 6 The relationship between the frequencies of the radio frequency signal and the audio signal is specifically determined by the actual types and actual parameters of the radio frequency signal and the audio signal, and is not limited in this embodiment of the present application.

[0080] Alternatively, the first audio line P1 may be a line originally provided in any electronic device for transmitting the audio signal to an external audio device. In this embodiment, the first audio line P1 may also be used as an antenna of the RF transmitting module 104 .

[0081] Also, see Figure 1 Specifically, the first low-pass filter module 101 can be connected to the high-pass filter module 102 and the second low-pass filter module 103 through the second audio line P2. Moreover, the second low-pass filter module 103 can also be connected to the audio device through the second audio line P2.

[0082] Generally, the material, diameter, and other parameters of the second audio cable P2 can be consistent with those of the first audio cable P1, but this embodiment of the present application does not limit this.

[0083] Optionally, the audio signal may be an electrical signal with a certain frequency output by the audio decoding device. Generally, the audio signal is output from the positive electrode of the audio decoding device and eventually returns to the negative electrode of the audio decoding device to form a current loop.

[0084] The audio device can convert an electrical signal into an acoustic signal. Generally, a coil is included in the audio device. For example, the audio device can be a speaker or other device.

[0085] It is worth noting that, in general, the audio device has a positive and negative pole, and the audio signal is generally transmitted to the positive pole of the audio device. In this embodiment, the connection relationship between the second low-pass filter module 103 and the radio frequency transmission module 104 and the positive and negative poles of the audio device is not particularly limited. In other words, the second low-pass filter module 103 and the radio frequency transmission module 104 can be connected to the positive pole of the audio device, or to the negative pole of the audio device. Correspondingly, the third end of the first low-pass filter module 101 can be connected to the positive pole of the audio device through the first audio line P1, or to the negative pole of the audio device through the first audio line P1. This embodiment of the application does not limit this.

[0086] It is worth noting that the embodiment of the present application is described by taking the connection between the first audio line P1 and the positive electrode of the audio device as an example. The working principle of the antenna multiplexing circuit 100 is as follows:

[0087] When an audio signal is input, the audio signal is filtered out by the first low-pass filter 101 to remove high-frequency signals and other frequency noise from the audio signal. The signal is then transmitted to the high-pass filter module 102 and the positive electrode of the audio device. Since the audio signal is a relatively low-frequency signal, the high-pass filter module 102 can block the transmission of the audio signal, and the audio signal can only be transmitted to the audio device along the first audio line P1. After the audio signal is transmitted to the audio device and converted into a sound signal, the audio signal is then transmitted to the second low-pass filter module 103 and the first low-pass filter 101 to form a current loop.

[0088] It can be seen that when transmitting the audio signal, the filtering effect of the high-pass filter module 102 can prevent the audio signal from directly passing through the high-pass filter module 102 and returning to the first low-pass filter 101, but instead propagates along the normal transmission path of the audio signal, thereby ensuring that the first audio line can normally realize its original function of transmitting the audio signal.

[0089] When the RF transmission module 104 outputs the RF signal, since the RF signal is a relatively high frequency signal, the first low-pass filter module 101 and the second low-pass filter module 103 can block the transmission of the RF signal. That is, the RF signal can only be transmitted to the first audio line P1 via the high-pass filter module 102, and then transmitted to the audio device via the first audio line P1, and then transmitted to the second low-pass filter module 103 via the audio device, where it is blocked from propagation. In other words, the RF signal can propagate from the connection point between the high-pass filter module 102 and the first audio line P1 along the first audio line P1 to the audio device. In this case, the first audio line P1 between the high-pass filter module 102 and the positive terminal of the audio device can be used as an antenna to transmit the RF signal.

[0090] Furthermore, since the audio device generally includes a coil, when the RF signal is transmitted to the coil, the coil can also serve as an antenna for the RF signal. Furthermore, the second audio line P2 between the negative terminal of the audio device and the second low-pass filter module 103 can also serve as an antenna for the RF signal.

[0091] In the embodiment of the present application, a first low-pass filter module 101, a high-pass filter module 102, a second low-pass filter module 103, and a radio frequency transmission module 104 are provided. Specifically, the first end and the second end of the first low-pass filter module 101 are used to transmit audio signals, respectively. The third end of the first low-pass filter module 101 is connected to the first end of the high-pass filter module 102 and an external audio device via a first audio line P1. The fourth end of the first low-pass filter module 101 is connected to the second end of the high-pass filter module 102, the signal output end of the radio frequency transmission module 104, and the first end of the second low-pass filter module 103. The second end of the second low-pass filter module 103 is used to connect to an audio device.

[0092] The first low-pass filter module 101 and the second low-pass filter module 103 filter or block the radio frequency signal, thereby preventing the radio frequency signal from being transmitted along other paths, thereby reducing the performance of the radio frequency signal. High-frequency signals in the audio signal can also be filtered out to improve the quality of the audio signal.

[0093] By filtering or blocking the audio signal through the high-pass filter module 102, the audio signal can be prevented from being transmitted along the transmission path of the radio frequency signal or from being unable to be normally transmitted to the audio device. That is, the normal transmission of the audio signal can be ensured.

[0094] In other words, antenna duplexing circuit 100 ensures the proper transmission of audio signals while also enabling the audio line used to transmit audio signals to the audio device to function as an RF antenna for the RF transmitter module. This achieves the goal of multiplexing the audio line into an RF antenna, thereby improving RF signal performance. Furthermore, antenna duplexing circuit 100 prevents interference between audio and RF signals simply by using low-pass and high-pass filtering modules. This eliminates the need for a separate RF antenna for RF signals, reducing material costs and eliminating the need for dedicated antenna installation space.

[0095] In this way, the performance of the radio frequency signal can be improved while taking into account the occupied space and cost.

[0096] In addition, when the audio line for transmitting the audio signal is used as the antenna of the radio frequency signal, the audio line for transmitting the audio signal is equivalent to the external antenna of the radio frequency signal, has good antenna efficiency and anti-interference ability, and can provide effective amplification for the radio frequency signal.

[0097] It should be noted that, for example, if the RF signal is a Bluetooth signal, and the wavelength of the Bluetooth signal is generally 0.125 meters (the wavelength of a 2.4 GHz Wi-Fi signal is also 0.125 meters), the length of the general RF antenna can be greater than one-quarter of the RF signal wavelength. Therefore, the length of the first RF line P1 capable of transmitting the RF signal only needs to be greater than 3.125 cm to meet the requirements of being an RF antenna. Generally, electronic devices can be equipped with audio cables longer than 3.125 cm. It can be seen that the solution provided by this application has high applicability.

[0098] In one possible implementation, see Figure 2 The first low-pass filtering module 101 includes: a first low-pass filtering unit 1011 and a second low-pass filtering unit 1012 .

[0099] The first end of the first low-pass filter unit 1011 is used to transmit the audio signal, and the second end of the first low-pass filter unit 1011 is connected to the first end of the high-pass filter module 102 and the audio device through the first audio line P1.

[0100] The first end of the second low-pass filtering unit 1012 is used to transmit the audio signal, and the second end of the second low-pass filtering unit 1012 is respectively connected to the second end of the high-pass filtering module 102, the signal output end of the RF transmitting module 104 and the first end of the second low-pass filtering module 103.

[0101] For example, if the positive pole of the audio device is connected to the first audio line P1, then the first end of the first low-pass filter unit 1011 can be used to input the audio signal, specifically connected to the positive pole of the above-mentioned audio decoding device, and at the same time, the first end of the second low-pass filter unit 1012 is connected to the negative pole of the audio decoding device so that the audio signal can form a loop.

[0102] If the negative pole of the audio device is connected to the first audio line P1, then the first end of the second low-pass filter unit 1012 can be used to input the audio signal, specifically connected to the positive pole of the audio decoding device. At the same time, the first end of the first low-pass filter unit 1011 is connected to the negative pole of the audio decoding device so that the audio signal forms a loop.

[0103] One possible way is to Figure 2 Based on this, continue to see Figure 3 The first low-pass filtering unit 1011 includes a first inductor L1, and the second low-pass filtering unit 1012 includes a second inductor L2.

[0104] The first end of the first inductor L1 is used to transmit the audio signal, and the second end of the first inductor L1 is connected to the first end of the high-pass filter module 102 and the audio device respectively through the first audio line P1.

[0105] The first end of the second inductor L2 is used to transmit the audio signal, and the second end of the second inductor L2 is connected to the second end of the high-pass filter module 102, the signal output end of the RF transmission module 104 and the first end of the second low-pass filter module 103 respectively.

[0106] One possible way, see Figure 3 , the second low-pass filtering module 103 includes a third inductor L3.

[0107] A first end of the third inductor L3 is connected to the fourth end of the first low-pass filter module 101 , and a second end of the third inductor L3 is used to connect to an audio device.

[0108] It is worth noting that the filtering capabilities of the first inductor L1, the second inductor L2, and / or the third inductor L3 can be adjusted by adjusting the inductance of the first inductor L1, the second inductor L2, and / or the third inductor L3. The inductance of the first inductor L1, the second inductor L2, and / or the third inductor L3 can be adjusted according to actual needs, for example, based on parameters such as the frequency of the audio signal, the frequency range of the RF signal, and the frequency of clutter present in the audio signal. This is not limited in the present embodiment.

[0109] It's worth noting that, because inductors block high frequencies and pass low frequencies, when a low-frequency audio signal is input into the first, second, and / or third inductors L1, L2, and / or L3, the audio signal can be transmitted normally. However, when a high-frequency RF signal is input into the first, second, and / or third inductors L1, L2, and / or L3, the first, second, and / or third inductors L1, L2, and / or L3 generate an induced electromotive force that blocks the RF signal from being transmitted.

[0110] In this way, the first inductor L1, the second inductor L2 and / or the third inductor L3 can be used to achieve the purpose of low-pass filtering; and the inductance of each inductor can be flexibly adjusted to flexibly adjust the low-pass filtering performance, thereby improving the practicality of the antenna multiplexing circuit 100.

[0111] In one possible implementation, see Figure 3 The high-pass filtering module 102 includes: a first capacitor C1.

[0112] The first plate of the first capacitor C1 is connected to the audio device via the first audio line P1 , and the second plate of the first capacitor C1 is connected to the signal output terminal of the RF transmitter module 104 .

[0113] Optionally, the capacitance of the first capacitor C1 may be adjusted according to actual needs, for example, according to parameters such as the frequency of the audio signal, the frequency range of the radio frequency signal, and the frequency of clutter in the audio signal.

[0114] It is worth noting that, because capacitors have the characteristic of blocking low frequencies and passing high frequencies, when a low-frequency audio signal is input to the first capacitor C1, the first capacitor C1 will generate a high capacitive reactance to prevent the audio signal from being transmitted. However, when a high-frequency RF signal is input to the first capacitor C1, the RF signal can be transmitted normally.

[0115] In this way, the first capacitor C1 can be used to achieve the purpose of high-pass filtering; and the capacitance of the first capacitor C1 can be flexibly adjusted to flexibly adjust the high-pass filtering performance, thereby improving the practicality of the antenna multiplexing circuit 100.

[0116] In one possible implementation, see Figure 4 , the circuit 100 further includes a filtering unit 105 .

[0117] A first end of the filter unit 105 is connected to a first end of the high-pass filter module 102 via a first signal line P1 , and a second end of the filter unit 105 is grounded.

[0118] Specifically, see Figure 4 , the filtering unit 105 includes a second capacitor C2.

[0119] The first plate of the second capacitor C2 is connected to the audio device and the first plate of the first capacitor C1 through the first audio line P1 , respectively. The second plate of the second capacitor C2 is grounded.

[0120] It is worth noting that the second capacitor C2 serves as a grounded filter capacitor, which can filter out useless noise in the circuit and stabilize the voltage, thereby improving the stability and reliability of the circuit 100.

[0121] In one possible implementation, see Figure 4 The first low-pass filtering unit 1011 further includes a first magnetic bead B1, and the second low-pass filtering unit 1012 further includes a second magnetic bead B2.

[0122] The first end of the first magnetic bead B1 is used to transmit the audio signal, and the second end of the first magnetic bead B1 is used to connect to the first end of the first inductor L1.

[0123] The first end of the second magnetic bead B2 is used to transmit the audio signal, and the second end of the second magnetic bead B2 is used to connect to the first end of the second inductor L2.

[0124] Optionally, the first magnetic bead B1 and the second magnetic bead B2 can be magnetic beads with low-pass frequencies selected according to the frequency range of the audio signal. Generally, the frequencies allowed to pass by the first magnetic bead B1 and the second magnetic bead B2 should meet the frequency range of the audio signal to eliminate clutter as much as possible.

[0125] It is worth noting that the first magnetic bead B1 and the second magnetic bead B2 can be used to suppress high-frequency noise and spike interference on the first audio line P1 and the second audio line P2. Moreover, the first magnetic bead B1 and the second magnetic bead B2 also have the ability to absorb electrostatic pulses.

[0126] The first ferrite bead B1 and the first inductor L1 form a first low-pass filter unit 1011, while the second ferrite bead B2 and the second inductor L2 form a second low-pass filter unit 1012. These components eliminate high-frequency interference when the audio signal is conducted. This further improves the filtering performance of the antenna duplexing circuit 100 and reduces the issue of current noise in the audio device.

[0127] In one possible embodiment, the first low-pass filtering unit 1011, the second low-pass filtering unit 1012, and / or the second low-pass filtering module 103 may also adopt any other possible design. For example, an amplifier may be used to perform a corresponding circuit design to form a corresponding low-pass filtering unit or low-pass filtering module, which is not limited in the present embodiment.

[0128] In one possible manner, the high-pass filter module 102 may also adopt any other possible design. For example, an amplifier may be used to perform a corresponding circuit design to form a high-pass filter module, which is not limited in the embodiment of the present application.

[0129] The present application also provides an antenna multiplexing system. Figure 5 The antenna duplexing system X includes an audio signal output device 200, an audio device 300, and any antenna duplexing circuit 100 as described in the above embodiments.

[0130] The audio signal output device 200 is used to output an audio signal.

[0131] The audio device 300 is used to convert the audio signal into audio and output the audio, and is used to act as an antenna when receiving the radio frequency signal output by the antenna duplexing circuit 100 .

[0132] Optionally, the audio signal output device 200 may be the above-mentioned audio decoding device, specifically an audio decoder.

[0133] The audio device 300 may be any device that can convert an electrical signal into an acoustic signal, specifically a device such as a speaker, which is not limited in this embodiment of the present application.

[0134] An embodiment of the present application further provides an electronic device, which includes any antenna multiplexing circuit 100 as in the above embodiments, or the antenna multiplexing system X as in the above embodiments.

[0135] It should be noted that the antenna multiplexing system X and the electronic device have the same working principle as the above-mentioned antenna multiplexing circuit 100, and can realize any function that the antenna multiplexing circuit 100 can realize, which will not be described in detail in the embodiment of the present application.

[0136] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0137] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An antenna multiplexing circuit, characterized in that: The circuit includes: a first low-pass filtering module, a high-pass filtering module, a second low-pass filtering module and a radio frequency transmitting module; The first end and the second end of the first low-pass filter module are respectively used to transmit audio signals, and the third end of the first low-pass filter module is connected to the first end of the high-pass filter module and an external audio device through a first audio line; The fourth end of the first low-pass filtering module is connected to the second end of the high-pass filtering module, the signal output end of the RF transmitting module and the first end of the second low-pass filtering module respectively; The second end of the second low-pass filter module is used to connect to an audio device; The RF transmitting module is used to output a RF signal, the minimum frequency of the RF signal is much greater than the maximum frequency of the audio signal, and the first audio line is used as an antenna for the RF transmitting module; The first low-pass filter module is used to filter out high-frequency signals of the radio frequency signal and the audio signal, and transmit the low-frequency signal of the audio signal to the audio device; the second low-pass filter module is used to filter out the radio frequency signal to prevent the radio frequency signal from being input into the audio device through the second low-pass filter module; The high-pass filter module is used to filter out the low-frequency signal of the radio frequency signal and the audio signal, and transmit the radio frequency signal to the first audio line and the audio device.

2. The antenna multiplexing circuit according to claim 1, wherein: The first low-pass filtering module includes: a first low-pass filtering unit and a second low-pass filtering unit; The first end of the first low-pass filter unit is used to transmit the audio signal, and the second end of the first low-pass filter unit is connected to the first end of the high-pass filter module and the audio device respectively through the first audio line; The first end of the second low-pass filtering unit is used to transmit the audio signal, and the second end of the second low-pass filtering unit is respectively connected to the second end of the high-pass filtering module, the signal output end of the RF transmitting module and the first end of the second low-pass filtering module.

3. The antenna multiplexing circuit according to claim 2, wherein: The first low-pass filtering unit includes a first inductor, and the second low-pass filtering unit includes a second inductor; The first end of the first inductor is used to transmit the audio signal, and the second end of the first inductor is connected to the first end of the high-pass filter module and the audio device respectively through the first audio line; The first end of the second inductor is used to transmit the audio signal, and the second end of the second inductor is respectively connected to the second end of the high-pass filter module, the signal output end of the RF transmitter module and the first end of the second low-pass filter module.

4. The antenna multiplexing circuit according to claim 3, wherein: The first low-pass filtering unit further includes a first magnetic bead, and the second low-pass filtering unit further includes a second magnetic bead; The first end of the first magnetic bead is used to transmit the audio signal, and the second end of the first magnetic bead is used to connect to the first end of the first inductor; The first end of the second magnetic bead is used to transmit the audio signal, and the second end of the second magnetic bead is used to connect to the first end of the second inductor.

5. The antenna multiplexing circuit according to claim 1, wherein: The second low-pass filtering module includes a third inductor; The first end of the third inductor is connected to the fourth end of the first low-pass filter module, and the second end of the third inductor is used to connect to an audio device.

6. The antenna multiplexing circuit according to claim 1, wherein: The high-pass filtering module includes: a first capacitor; The first plate of the first capacitor is connected to the audio device through the first audio line, and the second plate of the first capacitor is connected to the signal output end of the radio frequency transmitting module.

7. The antenna multiplexing circuit according to any one of claims 1 to 6, characterized in that: The radio frequency transmission module is a Bluetooth signal transmitter or a wireless network signal transmitter.

8. The antenna multiplexing circuit according to any one of claims 1 to 6, characterized in that: The circuit further includes a filtering unit; A first end of the filter unit is connected to a first end of the high-pass filter module through a first signal line, and a second end of the filter unit is grounded.

9. An antenna multiplexing system, characterized in that: The system comprises an audio signal output device, an audio device, and the antenna multiplexing circuit according to any one of claims 1 to 8; The audio signal output device is used to output audio signals; The audio device is used to convert the audio signal into audio and output the audio, and is used to serve as an antenna when receiving the radio frequency signal output by the antenna multiplexing circuit.

10. An electronic device, characterized in that: The electronic device includes the antenna multiplexing circuit according to any one of claims 1 to 8, or the antenna multiplexing system according to claim 9.

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