CN111800147A - Radio frequency transmitting device and earphone - Google Patents

Radio frequency transmitting device and earphone Download PDF

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Publication number
CN111800147A
CN111800147A CN202010477266.0A CN202010477266A CN111800147A CN 111800147 A CN111800147 A CN 111800147A CN 202010477266 A CN202010477266 A CN 202010477266A CN 111800147 A CN111800147 A CN 111800147A
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CN
China
Prior art keywords
radio frequency
signal
receiving
wireless
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010477266.0A
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Chinese (zh)
Inventor
黄天才
王丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Horn Audio Co Ltd
Original Assignee
Shenzhen Horn Audio Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Horn Audio Co Ltd filed Critical Shenzhen Horn Audio Co Ltd
Priority to CN202010477266.0A priority Critical patent/CN111800147A/en
Publication of CN111800147A publication Critical patent/CN111800147A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02Transmitters
    • H04B1/04Circuits
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/10Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1091Details not provided for in groups H04R1/1008 - H04R1/1083
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups

Abstract

A first amplifying circuit in the radio frequency transmitting device amplifies an initial radio frequency signal to generate a target radio frequency signal, a first gating circuit feeds back signal transmission intensity of each wireless transmitting component in the signal transmission direction, and the wireless transmitting component with the maximum signal transmission intensity in the signal transmission direction is gated according to a switching signal, and the target radio frequency signal is wirelessly transmitted by the component. The first control circuit outputs an initial radio frequency signal to the first amplifying circuit and correspondingly outputs a switching signal according to the signal transmission intensity fed back by the first gating circuit. According to the radio frequency transmitting device and the earphone, the signal transmission directions of the wireless transmitting assemblies are different, the target radio frequency signal is only transmitted outwards along the direction with the maximum signal transmission intensity, and the target radio frequency signal is obtained by amplifying the initial radio frequency signal, so that the effective communication distance is increased, the signal fidelity is high, and the user experience is high.

Description

Radio frequency transmitting device and earphone
Technical Field
The application belongs to the technical field of audio equipment, and particularly relates to a radio frequency transmitting device and an earphone.
Background
The wireless radio frequency earphone is widely applied to scenes such as games, music, calls, video playing and the like, and compared with the Bluetooth earphone, the wireless radio frequency earphone has stronger transmission stability. The wireless radio frequency earphone consists of a wireless radio frequency transmitting device and a wireless radio frequency receiving device. However, compared with the bluetooth headset, the transmission power of the radio frequency transmitting device of the conventional wireless radio frequency headset is only 2dB, the effective communication distance is short, signal distortion is easily caused when long-distance (10 m-20 m) communication is performed, and the user experience is low.
Therefore, the conventional wireless radio frequency transmitting device has the problems that the effective communication distance is short, signal distortion is easily caused when long-distance (10 m-20 m) communication is carried out, and the user experience is low.
Disclosure of Invention
The application aims to provide a radio frequency transmitting device and an earphone, and aims to solve the problems that the traditional wireless radio frequency earphone is short in effective communication distance, easy to cause signal distortion when long-distance (10 m-20 m) communication is carried out, and low in user experience degree.
A first aspect of an embodiment of the present application provides a radio frequency transmitting apparatus, including:
the first amplifying circuit is used for generating a target radio frequency signal after the received initial radio frequency signal is subjected to power amplification processing;
the wireless transmitting assemblies are used for wirelessly transmitting the target radio frequency signal when receiving the target radio frequency signal;
the first gating circuit is connected with the first amplifying circuit and the wireless transmitting assemblies and used for receiving the target radio frequency signals, feeding back the signal transmission strength of each wireless transmitting assembly and gating one wireless transmitting assembly to work according to a switching signal, wherein the signal transmission strength of the wireless transmitting assembly is greater than the signal transmission strengths of other wireless transmitting assemblies; and
and the first control circuit is connected with the first amplifying circuit and the first gating circuit and used for outputting the initial radio frequency signal to the first amplifying circuit and correspondingly outputting the switching signal according to the signal transmission intensity fed back by the first gating circuit.
A second aspect of embodiments of the present application provides a headset, comprising:
the radio frequency transmitting device;
the radio frequency receiving device is used for wirelessly receiving the target radio frequency signal transmitted by the radio frequency transmitting device, processing the target radio frequency signal and then outputting the processed target radio frequency signal; and
and the loudspeaker is connected with the radio frequency receiving device and used for receiving the processed target radio frequency signal and playing the target radio frequency signal.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the radio frequency transmitting device and the earphone comprise at least two wireless transmitting assemblies, the signal transmission directions of the wireless transmitting assemblies are different, the target radio frequency signal is only sent outwards along the direction with the maximum signal intensity, and the target radio frequency signal is obtained after the initial radio frequency signal is amplified by the first amplifying circuit, so that the effective communication distance is increased, the signal fidelity is high in the long-distance communication process, and the user experience is high.
Drawings
Fig. 1 is a schematic block diagram of a radio frequency transmitting apparatus according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of an external structure of the RF transmitting device shown in FIG. 1;
fig. 3 is a schematic structural diagram of a module of an earphone according to an embodiment of the present application;
fig. 4 is a schematic block diagram of the wireless receiving device in the earphone shown in fig. 3;
FIG. 5 is a schematic diagram of a circuit board structure of the infinite receiving apparatus shown in FIG. 4;
fig. 6 is a schematic view of the whole module structure of the earphone shown in fig. 3;
fig. 7 is a schematic view of the entire external structure of the earphone shown in fig. 6.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, a schematic block diagram of a radio frequency transmitting apparatus 10 according to an embodiment of the present application is shown, for convenience of description, only parts related to the embodiment are shown, and the following details are described:
a radio frequency transmitting device 10 comprises a first amplifying circuit 11, at least two wireless transmitting components 12, a first gating circuit 13 and a first control circuit 14.
The first control circuit 14 is connected to the first amplifying circuit 11 and the first gating circuit 13, the first amplifying circuit 11 is connected to the first gating circuit 13, and the first gating circuit 13 is connected to each wireless transmitting component 12.
The first control circuit 14 is externally connected to the audio device, receives an initial radio frequency signal output by the audio device, and transmits the initial radio frequency signal to the first amplifying circuit 11.
Specifically, the first control circuit 14 may further perform filtering, noise reduction, compression, or digitization on the initial radio frequency signal, and then output the initial radio frequency signal to the first amplifying circuit 11. The audio equipment comprises a desktop computer, a notebook computer, a tablet, a smart phone, an intelligent vehicle-mounted audio system and an intelligent electronic musical instrument.
The first amplifying circuit 11 performs power amplification processing on the received initial radio frequency signal to generate a target radio frequency signal, and outputs the target radio frequency signal to the first gating circuit 13.
Specifically, the power for the operation of the first amplifying circuit 11 is provided by an audio device externally connected to the first control circuit 14. Through carrying out power amplification to initial radio frequency signal, can promote the transmitting power of radio frequency transmitting device 10 from 2dB to 8 ~ 10dB for the target radio frequency signal transmission distance that generates is longer, signal fidelity is higher, avoids long distance transmission to lead to the signal seriously to attenuate, reduces user experience degree.
In the wireless transmitting assemblies 12, the signal transmission directions of the wireless transmitting assemblies 12 are different, and when any wireless transmitting assembly 12 is used for receiving a target radio frequency signal, the target radio frequency signal is wirelessly transmitted along the signal transmission direction of the wireless transmitting assembly 12.
Specifically, at most one wireless transmission assembly 12 receives the target radio frequency signal at any time point and wirelessly transmits the target radio frequency signal along the signal transmission direction of the wireless transmission assembly, and the other wireless transmission assemblies 12 do not transmit the target radio frequency signal. The first gating circuit 13 is connected between the first amplifying circuit 11 and the wireless transmitting component 12, and the wireless transmitting component 12 receives the target radio frequency signal transmitted by the first gating circuit 13.
When the first gating circuit 13 receives the target radio frequency signal output by the first amplifying circuit 11, the signal transmission strength of each wireless transmitting component 12 is fed back to the first control circuit 14, and one wireless transmitting component 12 is gated to operate according to the switching signal, and the signal transmission strength of the wireless transmitting component 12 is greater than the signal transmission strengths of the other wireless transmitting components 12, that is, the signal transmission strength corresponding to the signal transmission direction of the gated wireless transmitting component 12 is the maximum.
Specifically, since the signal transmission directions of the wireless transmitting assemblies 12 are different, the signal transmission strengths of the wireless transmitting assemblies are different. Especially for the wireless transmitting components 12 transmitting the target radio frequency signals in the frequency band of 2.4GHz to 2.4835GHz, the directionality of the components is strong, and the influence of different signal transmission directions on the transmitting power is large.
Specifically, the first gating circuit 13 is connected between the first amplifying circuit 11 and each wireless transmitting component 12, and is responsible for gating a channel between the first amplifying circuit 11 and a certain wireless transmitting component 12 according to the switching signal, the gating speed is in the millisecond level, and the gated wireless transmitting component 12 can receive the target radio frequency signal and perform wireless transmission. The signal transmission strength in the signal transmission direction of the gated wireless transmission component 12 is greater than the signal transmission strength in the signal transmission direction of the remaining wireless transmission components 12.
Optionally, the radio frequency transmitting device has two wireless transmitting assemblies with signal transmission directions perpendicular to each other.
The first control circuit 14 correspondingly outputs a switching signal according to the signal transmission intensity fed back by the first gating circuit 13, and the switching signal controls the wireless transmitting component 12 with the maximum signal transmission intensity in the corresponding gating signal transmission direction of the first gating circuit 13.
In the radio frequency transmitting device 10, the signal transmission direction of each wireless transmitting component 12 is different from the signal transmission direction of the other wireless transmitting components 12, the target radio frequency signal is only transmitted outwards along the direction with the maximum signal transmission intensity, and the target radio frequency signal is obtained by amplifying the initial radio frequency signal, so that the effective communication distance is increased, the signal fidelity is high, and the user experience is high.
In an alternative embodiment, the first amplifying circuit 11 is implemented by a Radio Frequency Power Amplifier (RFPA).
Specifically, the input terminal of the RFPA is connected to the first control circuit 14, and the output terminal of the RFPA is connected to the first gating circuit 13. The power for the operation of the RFPA is provided by an audio device externally connected to the first control circuit 14.
Optionally, the first amplifying circuit 11 may also be implemented by a Low Noise Amplifier (LNA). The input terminal of the LNA is connected to the first control circuit 14, and the output terminal of the LNA is connected to the first gating circuit 13. The power for the LNA operation is provided by an audio device external to the first control circuit 14.
The initial radio frequency signal is amplified through the first amplifying circuit 11, so that the target radio frequency signal transmitted wirelessly is longer in transmission distance and high in signal fidelity, and the user experience is greatly improved.
In an alternative embodiment, the first gating circuit 13 is implemented using a single-pole double-throw switch or a single-pole multi-throw switch.
Specifically, when the radio frequency transmitting apparatus 10 has two wireless transmitting assemblies 12, the first gating circuit 13 is implemented by a single-pole double-throw switch, and when the radio frequency transmitting apparatus 10 has three or more wireless transmitting assemblies 12, the first gating circuit 13 is implemented by a single-pole double-throw switch. The single-pole double-throw switch/single-pole multi-throw switch used in the present embodiment has a low insertion loss characteristic.
The active end of the single-pole double-throw switch/single-pole multi-throw switch is connected with the first amplifying circuit 11, the active end is the end with the pole, each gating end of the single-pole double-throw switch/single-pole multi-throw switch is respectively connected with each wireless transmitting component 12, and when the active end is connected with one gating end through the pole, the wireless transmitting component 12 correspondingly connected with the gating end can receive a target radio frequency signal and wirelessly transmit the target radio frequency signal.
The first control circuit 14 is configured to output an initial rf signal to the first amplifying circuit 11, and correspondingly output a switching signal according to the signal transmission strength fed back by the first gating circuit 13.
Specifically, the first control circuit 14 is implemented by an integrated circuit.
Specifically, the single-pole double-throw switch/single-pole multi-throw switch is connected to the first control circuit 14, and feeds back the signal transmission strength in the signal transmission direction of each wireless transmission component 12 to the first control circuit 14. The specific feedback modes include the following two types:
first, after the radio frequency transmitter 10 is powered on, the active end of the single-pole double-throw switch/single-pole multi-throw switch is connected with one of the gating ends by default, and the single-pole double-throw switch/single-pole multi-throw switch feeds back the signal transmission strength in the signal transmission direction of the wireless transmitter 12 connected with the gating end in the state, the first control circuit 14 compares the received signal transmission strength value with a first preset strength value, when the signal transmission strength is lower than the first preset strength value, the first control circuit 14 outputs a switching signal to the single-pole double-throw switch/single-pole multi-throw switch, controls the active end of the single-pole double-throw switch/single-pole multi-throw switch to be connected with the other gating end, and when one of the gating ends is connected, the signal transmission strength value in the signal transmission direction of the wireless transmitter 12 correspondingly connected with the first preset strength value is reached or exceeded, the first control circuit 14 stops outputting the switching signal. The first predetermined strength value is calculated in advance, and at most one of the signal transmission strength values in the signal transmission direction of all the wireless transmitting assemblies 12 can reach the first predetermined strength value at any time.
Secondly, after the radio frequency transmitting device 10 is powered on, the first control circuit 14 outputs a switching circuit, the active end of the single-pole double-throw switch/single-pole multi-throw switch is sequentially connected with the plurality of gating ends one by one, the signal transmission strengths in the signal transmission directions of the plurality of wireless transmitting assemblies 12 fed back by the single-pole double-throw switch/single-pole multi-throw switch are compared, the first control circuit 14 selects the wireless transmitting assembly 12 with the maximum signal transmission strength in the signal transmission direction, and outputs a switching signal again, so that the gating end corresponding to the wireless transmitting assembly 12 with the maximum signal transmission strength in the signal transmission direction is connected with the active end.
The single-pole double-throw switch/single-pole multi-throw switch is controlled by a switching signal to be gated, the gating speed is in millisecond level, the wireless transmitting component 12 with the maximum signal transmission strength in the signal transmission direction can be selected within a time range which cannot be detected by human ears, and the target radio frequency signal is wirelessly transmitted.
In an alternative embodiment, in order to meet the miniaturization requirement of the rf transmitter 10, the wireless transmitter 12 is implemented by a ceramic antenna.
Specifically, the sizes of the ceramic antenna include 1608, 2012, 3216, 5010, and 7020, and the specific meanings of the above-mentioned sizes are as follows: the first two digits are the length of the ceramic antenna (16, 20, 32, 50, 70), the last two digits are the width of the ceramic antenna (08, 12, 16, 10, 20), and the dimensions are in millimeters.
Optionally, when the radio frequency transmitting apparatus 10 has two wireless transmitting assemblies 12, the two wireless transmitting assemblies 12 are both implemented by using ceramic antennas, one of the ceramic antennas is a FIFA antenna, the other ceramic antenna is a monopole antenna, and the FIFA antenna and the monopole antenna are vertically disposed, and when an antenna OTA test system is tested, the highest isolation and the lowest interference are achieved by the combination of the above-mentioned placement mode and antenna type.
Optionally, the radio frequency transmitting device 10 provided in this application uses a 2.4G ceramic antenna as the wireless transmitting component 12, and an operating frequency band of the radio frequency transmitting device 10 is 2.400GHz to 2.4835 GHz. The 2.4G antenna has strong directivity, and a signal in a certain direction is poor, so that a click sound and silence can be generated in actual experience. In order to improve the directivity of the 2.4G antenna, the multi-antenna design is adopted, and the optimal signal transmission direction is selected through the first gating circuit 13 for wireless transmission.
The signal transmission directions of the ceramic antennas are different from each other, and the signal transmission strengths in the signal transmission directions are different from each other. The signal transmission direction of each ceramic antenna has a certain angle. For example, when one radio frequency transmission device 10 has two wireless transmission components 12 (i.e., two ceramic antennas), the two ceramic antennas can be disposed in a perpendicular state to each other.
In an alternative embodiment, two of the wireless transmitting assemblies 12 are spaced apart by a predetermined distance. Through designing the preset distance between every two wireless transmitting assemblies 12, the mutual interference between the wireless transmitting assemblies 12 is reduced, the isolation degree is increased, and the stability and the reliability of the radio frequency transmitting device 10 are improved.
In the radio frequency transmitting device 10, the signal transmission direction of each wireless transmitting component 12 is different from the signal transmission direction of the other wireless transmitting components 12, the target radio frequency signal is only transmitted outwards along the direction with the maximum signal transmission intensity, and the target radio frequency signal is obtained by amplifying the initial radio frequency signal, so that the effective communication distance is increased, the signal fidelity is high, and the user experience is high.
Referring to fig. 2, an external structural diagram of the radio frequency transmitting device 10 shown in fig. 1 is shown, for convenience of illustration, only the parts related to the present embodiment are shown, and the following details are described:
in an alternative embodiment, the rf transmitter 10 has a USB interface; the USB interface is connected to the audio device, and transmits the initial rf signal output by the audio device to the internal first control circuit 14.
The radio frequency transmitting device 10 connected with the audio equipment is realized by adopting a USB interface, is one of hardware encryption locks, is commonly called a Dongle, and has the English name of Dongle. Alternatively to this, the first and second parts may,
in other alternative embodiments, the rf transmitter 10 may also use lighting interface, high definition interface, digital coaxial interface, lotus head interface or balanced analog audio and audio device.
Referring to fig. 3, a schematic block diagram of an earphone 100 according to an embodiment of the present disclosure is shown, for convenience of description, only parts related to the embodiment are shown, and the following details are described:
an earphone 100 comprises the above-mentioned radio frequency transmitting device 10, and further comprises a radio frequency receiving device 20 and a speaker 30.
The radio frequency transmitter 10 is in wireless communication with the radio frequency receiver 20, and the speaker 30 is connected to the radio frequency receiver 20.
And the radio frequency receiving device 20 is configured to wirelessly receive the target radio frequency signal transmitted by the radio frequency transmitting device 10, process the target radio frequency signal, and output the processed target radio frequency signal.
The speaker 30 is configured to receive the processed target radio frequency signal and play the processed target radio frequency signal.
Optionally, the earphone 100 is a 2.4G wireless earphone, and an operating frequency band of the earphone is in a range from 2.400GHz to 2.4835 GHz.
In the above-mentioned earphone 100, the radio frequency transmitting device 10 includes at least two wireless transmitting assemblies 12, the signal transmission direction of each wireless transmitting assembly 12 is different from the signal transmission direction of the other wireless transmitting assemblies 12, the target radio frequency signal is only sent out along the direction with the maximum signal transmission intensity, and the target radio frequency signal is obtained by amplifying the initial radio frequency signal, so that the effective communication distance is increased, the signal fidelity is high, and the user experience is high.
Please refer to fig. 4, which is a schematic block diagram of the wireless receiving device in the earphone 100 shown in fig. 3, for convenience of description, only the parts related to the present embodiment are shown, and the following details are described below:
in an alternative embodiment, the rf receiving device 20 includes at least two wireless receiving components 21, and further includes a second gating circuit 22, a second amplifying circuit 23, and a second control circuit 24.
The second gating circuit 22 is connected to the wireless receiving module 21, the second amplifying circuit 23 is connected to the wireless receiving module 21 and the second gating circuit 22, and the second control circuit 24 is connected to the second gating circuit 22, the second amplifying circuit 23, and the speaker 30.
In addition, the signal receiving direction of any one of the wireless receiving modules 21 is different from the signal receiving directions of the remaining wireless receiving modules 21.
Any wireless receiving component 21 is used for wirelessly receiving the target radio frequency signal when being gated.
Specifically, at most one wireless receiving component 21 receives the target rf signal at any time point and wirelessly receives the target rf signal along its own receiving direction, and the other wireless transmitting components 12 do not receive the target rf signal.
The second gating circuit 22 is configured to feed back the signal receiving strength in the signal receiving direction of each wireless receiving component 21, and gate one wireless receiving component 21 to operate according to the selection signal, where the signal receiving strength of the wireless receiving component 21 is greater than the signal receiving strengths of the other wireless transmitting components 21 — in other words, the signal receiving strength in the signal receiving direction of the wireless receiving component 21 is the greatest.
Specifically, since the signal receiving directions of the wireless receiving units 21 are different, the respective signal receiving strengths are different. Especially for the wireless receiving module 21 receiving the target radio frequency signal in the frequency band of 2.4GHz to 2.4835GHz, the directivity of the wireless receiving module 21 is strong, and the influence of different signal receiving directions on the receiving sensitivity is large.
Optionally, the radio frequency receiving apparatus has two wireless transmitting assemblies with signal receiving directions perpendicular to each other.
Optionally, the second gating circuit 22 is implemented by a single-pole double-throw switch or a single-pole multi-throw switch.
Specifically, when the radio frequency receiving device 20 has two wireless receiving components 21, the second gating circuit 22 is implemented by a single-pole double-throw switch, and when the radio frequency receiving device 20 has three or more wireless receiving components 21, the second gating circuit 22 is implemented by a single-pole double-throw switch. The single-pole double-throw switch/single-pole multi-throw switch used in the present embodiment has a low insertion loss characteristic.
The active end of the single-pole double-throw switch/single-pole multi-throw switch is connected with the second amplifying circuit 23, the active end is the end with the pole, each gating end of the single-pole double-throw switch/single-pole multi-throw switch is respectively connected with each wireless receiving component 21, and when the active end is connected with one gating end through the pole, the wireless receiving component 21 correspondingly connected with the gating end can wirelessly receive a target radio frequency signal.
The second amplifying circuit 23 is configured to receive the target radio frequency signal, amplify the target radio frequency signal, and output the amplified target radio frequency signal to the second control circuit 24.
Optionally, the second amplifying circuit 23 is implemented by an rf pa or an LNA. Specifically, the input terminal of the RFPA/LNA is connected to the second control circuit 24, and the output terminal of the RFPA/LNA is connected to the second gating circuit 22. .
Optionally, the first amplifying circuit 11 may also be implemented by a Low Noise Amplifier (LNA). The input terminal of the LNA is connected to the first control circuit 14, and the output terminal of the LNA is connected to the first gating circuit 13. The power for the LNA operation is provided by an audio device external to the first control circuit 14.
The second control circuit 24 is configured to output a selection signal according to the signal receiving strength in the signal receiving direction of each wireless receiving component 21 fed back by the second gating circuit 22, and output the amplified target radio frequency signal to the speaker 30, and play the target radio frequency signal by the speaker 30.
Specifically, the second control circuit 24 is implemented by an integrated circuit.
The second gating circuit 22 implemented by a single-pole double-throw switch/single-pole multi-throw switch is connected to the second control circuit 24, and feeds back the signal receiving strength in the respective receiving direction of each wireless receiving component 21 to the second control circuit 24. Specifically, the feedback mode of the second gating circuit 22 includes the following two modes:
first, after the rf receiving device 20 is powered on, the active end of the single-pole double-throw switch/single-pole multiple-throw switch is connected to one of the gating ends by default, and the single-pole double-throw switch/single-pole multiple-throw switch feeds back the signal receiving strength in the receiving direction of the wireless receiving component 21 connected to the gating end in this state, the second control circuit 24 compares the received signal receiving strength value with a second preset strength value, when the signal receiving strength is lower than the second preset strength value, the second control circuit 24 outputs a selection signal to the single-pole double-throw switch/single-pole multiple-throw switch, controls the active end of the single-pole double-throw switch/single-pole multiple-throw switch to connect to the other gating end, until one of the gating ends is connected, the signal receiving strength value in the receiving direction of the wireless receiving component 21 correspondingly connected thereto reaches or exceeds the second preset strength value, the second control circuit 24 stops outputting the selection signal. The second predetermined strength value is calculated in advance, and at most one of the signal reception strength values in the reception direction of all the wireless reception elements 21 can reach the second predetermined strength value at any time.
Secondly, after the rf receiving device 20 is powered on, the second control circuit 24 outputs a switching circuit, the active end of the single-pole double-throw switch/single-pole multi-throw switch is sequentially connected with the plurality of gating ends one by one, and compares the signal receiving strength in the receiving direction of each of the plurality of wireless receiving components 21 fed back by the single-pole double-throw switch/single-pole multi-throw switch, and the second control circuit 24 selects one wireless receiving component 21 with the maximum signal receiving strength in the receiving direction and outputs the selection signal again, so as to connect the gating end corresponding to the wireless receiving component 21 with the maximum signal receiving strength in the receiving direction with the active end.
The single-pole double-throw switch/single-pole multi-throw switch is controlled by a selection signal to carry out gating, the gating speed is in millisecond level, the wireless receiving component 21 with the maximum signal receiving intensity in the receiving direction can be selected in a time range which cannot be detected by human ears, and the target radio frequency signal is wirelessly received.
In the above-mentioned radio frequency receiving apparatus 20, the signal transmission direction of each wireless receiving component 21 is different from the receiving direction of the other wireless receiving components 21, the target radio frequency signal is received only along the receiving direction with the maximum signal receiving intensity, and the target radio frequency signal is amplified and then output to the second control circuit 24; therefore, the effective communication distance is increased, the signal fidelity is high, the receiving sensitivity is high, and the user experience is high.
The present embodiment provides an earphone 100, which includes the above-mentioned radio frequency transmitting device 10, and further includes the above-mentioned radio frequency receiving device 20. In the radio frequency transmitting device 10, the signal transmission direction of each wireless transmitting component 12 is different from the signal transmission direction of the other wireless transmitting components 12, the target radio frequency signal is only transmitted outwards along the direction with the maximum signal receiving intensity, and the target radio frequency signal is obtained by amplifying the initial radio frequency signal; in the rf receiving device 20, the signal transmission direction of each wireless receiving component 21 is different from the receiving direction of the other wireless receiving components 21, the target rf signal is received only along the receiving direction with the maximum signal receiving intensity, and the target rf signal is amplified and then output to the second control circuit 24; therefore, through the cooperation of the rf transmitter 10 and the rf receiver 20, the effective communication distance is increased, the signal fidelity is high, the receiving sensitivity is high, and the user experience is high.
Please refer to fig. 5, which is a schematic diagram of a circuit board structure of the infinite receiving apparatus shown in fig. 4, for convenience of description, only the parts related to the present embodiment are shown, and the details are as follows:
in an alternative embodiment, the earphone 100 provided by the present application has a circular PCB board, on which the second control circuit 24, the second amplifying circuit 23, the second gating circuit 22 and some parts of each wireless receiving assembly 21 are soldered.
The hollow circular part in the middle of the circular PCB is used for arranging a loudspeaker 30.
Optionally, each of the wireless receiving components 21 described above is implemented by using an IPEX antenna. As shown in fig. 5, the IPEX antenna includes an antenna pedestal IPEX0, a coaxial cable COAX and a flexible circuit board FPC, two ends of the coaxial cable COAX are respectively connected to the antenna pedestal IPEX0 and the flexible circuit board FPC, an IPEX interface is formed on the PCB, the antenna pedestal IPEX0 is correspondingly buckled at the IPEX interface, and the IPEX antenna can be used. Through adopting the IPEX antenna as wireless receiving assembly 21, only need set up the IPEX interface on the PCB board can, all component structures that need not to use the IPEX antenna all set up on the PCB board to can reduce the area of PCB board, do benefit to earphone 100 and realize the miniaturization, and be convenient for set up big loudspeaker 30 at hollow circle part, improve user experience degree.
Optionally, the radio frequency receiving apparatus 20 includes at least two wireless receiving assemblies 21, each wireless receiving assembly 21 is formed by an IPEX antenna, and the flexible printed circuit FPC in each IPEX antenna is respectively and independently referenced to the ground, so as to improve the isolation between the IPEX antennas.
Please refer to fig. 6, which is a schematic diagram of an overall module structure of the earphone 100 shown in fig. 3, and for convenience of description, only the parts related to the present embodiment are shown, and detailed as follows:
the earphone 100 of the present embodiment includes a radio frequency transmitter 10, a radio frequency receiver 20, and a speaker 30.
The wireless transmitting assembly 12 in the radio frequency transmitting device 10 and the wireless receiving assembly 21 in the radio frequency receiving device 20 perform wireless communication, the radio frequency transmitting device 10 amplifies an initial radio frequency signal to obtain a target radio frequency signal, wirelessly transmits the target radio frequency signal through the wireless transmitting assembly 12 with the maximum signal transmission strength in the signal transmission direction, receives the target radio frequency signal through the wireless receiving assembly 21 with the maximum signal receiving strength in the receiving direction in the radio frequency receiving device 20, amplifies the target radio frequency signal again, and outputs the target radio frequency signal to the loudspeaker 30 for playing. Therefore, the earphone 100 provided by the embodiment has the advantages of high signal fidelity, effective communication over long distance, high receiving sensitivity, high user experience, and the like.
The effective communication distance of the earphone 100 provided by the embodiment can reach 10-20 m, the transmitting power of the radio frequency transmitting device 10 can reach 8 dB-10 dB, and the receiving sensitivity of the radio frequency receiving device 20 can reach 10 dB.
Fig. 7 is a schematic diagram of the overall external structure of the earphone 100 shown in fig. 6, and for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
the earphone 100 of the present embodiment includes a radio frequency transmitter 10, a radio frequency receiver 20, and a speaker 30.
The radio frequency transmitting device 10 is provided with a USB interface, and is connected with audio equipment through the USB interface; each circuit in the radio frequency receiving device 20 is welded on a circular PCB, only part of the structure of the wireless receiving component 21 is buckled on the PCB, and the loudspeaker 30 is arranged on the hollow circular part in the center of the circular PCB.
The wireless transmitting assembly 12 in the radio frequency transmitting device 10 and the wireless receiving assembly 21 in the radio frequency receiving device 20 perform wireless communication, the radio frequency transmitting device 10 amplifies an initial radio frequency signal to obtain a target radio frequency signal, wirelessly transmits the target radio frequency signal through the wireless transmitting assembly 12 with the maximum signal transmission strength in the signal transmission direction, receives the target radio frequency signal through the wireless receiving assembly 21 with the maximum signal receiving strength in the receiving direction in the radio frequency receiving device 20, amplifies the target radio frequency signal again, and outputs the target radio frequency signal to the loudspeaker 30 for playing. Therefore, the earphone 100 provided by the embodiment has the advantages of high signal fidelity, effective communication over long distance, high receiving sensitivity, high user experience, and the like.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A radio frequency transmission apparatus, comprising:
the first amplifying circuit is used for generating a target radio frequency signal after the received initial radio frequency signal is subjected to power amplification processing;
the wireless transmitting assemblies are used for wirelessly transmitting the target radio frequency signal when receiving the target radio frequency signal;
the first gating circuit is connected with the first amplifying circuit and the wireless transmitting assemblies and used for receiving the target radio frequency signals, feeding back the signal transmission strength of each wireless transmitting assembly and gating one wireless transmitting assembly to work according to a switching signal, wherein the signal transmission strength of the wireless transmitting assembly is greater than the signal transmission strengths of other wireless transmitting assemblies; and
and the first control circuit is connected with the first amplifying circuit and the first gating circuit and used for outputting the initial radio frequency signal to the first amplifying circuit and correspondingly outputting the switching signal according to the signal transmission intensity fed back by the first gating circuit.
2. The radio frequency transmission apparatus according to claim 1, wherein the first amplification circuit is implemented using a radio frequency power amplifier.
3. The radio frequency transmitting device of claim 1, wherein the first gating circuit is implemented using a single-pole double-throw switch or a single-pole multiple-throw switch.
4. The radio frequency transmission apparatus according to claim 1, wherein the wireless transmission component is implemented by using a ceramic antenna.
5. The radio frequency transmission apparatus according to claim 1, wherein two of the wireless transmission components are spaced apart by a predetermined distance.
6. The radio frequency transmission apparatus according to claim 1, wherein the radio frequency transmission apparatus has two wireless transmission components whose signal transmission directions are perpendicular to each other.
7. An earphone, comprising:
the radio frequency transmission arrangement of any one of claims 1 to 6;
the radio frequency receiving device is used for wirelessly receiving the target radio frequency signal transmitted by the radio frequency transmitting device, processing the target radio frequency signal and then outputting the processed target radio frequency signal; and
and the loudspeaker is connected with the radio frequency receiving device and used for receiving the processed target radio frequency signal and playing the target radio frequency signal.
8. The headset of claim 7, wherein the radio frequency receiving means comprises:
the wireless receiving components are used for wirelessly receiving the target radio frequency signal when being gated;
the second gating circuit is connected with the wireless receiving assemblies and used for feeding back the signal receiving strength of each wireless receiving assembly in the signal receiving direction and correspondingly gating one wireless receiving assembly to work according to the selection signal, wherein the signal receiving strength of the wireless receiving assembly is greater than the signal receiving strength of other wireless transmitting assemblies;
the second amplifying circuit is connected with the wireless receiving assembly and the second gating circuit and used for receiving the target radio frequency signal, amplifying the target radio frequency signal and outputting the amplified target radio frequency signal; and
and the second control circuit is connected with the second gating circuit, the second amplifying circuit and the loudspeaker and is used for correspondingly outputting the selection signal according to the signal receiving strength of each wireless receiving assembly in the signal receiving direction fed back by the second gating circuit and outputting the amplified target radio frequency signal to the loudspeaker.
9. The headset of claim 8, wherein the second amplification circuit is implemented with a low noise amplifier.
10. The headset of claim 8, wherein the wireless receiving component is implemented using an IPEX antenna.
CN202010477266.0A 2020-05-29 2020-05-29 Radio frequency transmitting device and earphone Pending CN111800147A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010477266.0A CN111800147A (en) 2020-05-29 2020-05-29 Radio frequency transmitting device and earphone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010477266.0A CN111800147A (en) 2020-05-29 2020-05-29 Radio frequency transmitting device and earphone

Publications (1)

Publication Number Publication Date
CN111800147A true CN111800147A (en) 2020-10-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010477266.0A Pending CN111800147A (en) 2020-05-29 2020-05-29 Radio frequency transmitting device and earphone

Country Status (1)

Country Link
CN (1) CN111800147A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205958733U (en) * 2016-08-26 2017-02-15 西门子(深圳)磁共振有限公司 Radio frequency emission device and magnetic resonance imaging system
CN107258058A (en) * 2015-02-27 2017-10-17 伯斯有限公司 The system and method for antenna diversity switching
CN107734586A (en) * 2017-09-28 2018-02-23 广东欧珀移动通信有限公司 The switching method and mobile terminal of antenna
CN207638833U (en) * 2017-12-06 2018-07-20 歌尔科技有限公司 A kind of neck hanging type wireless earphone
CN110830071A (en) * 2019-11-12 2020-02-21 天津津航计算技术研究所 Multi-antenna radio frequency front-end circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107258058A (en) * 2015-02-27 2017-10-17 伯斯有限公司 The system and method for antenna diversity switching
CN205958733U (en) * 2016-08-26 2017-02-15 西门子(深圳)磁共振有限公司 Radio frequency emission device and magnetic resonance imaging system
CN107734586A (en) * 2017-09-28 2018-02-23 广东欧珀移动通信有限公司 The switching method and mobile terminal of antenna
CN207638833U (en) * 2017-12-06 2018-07-20 歌尔科技有限公司 A kind of neck hanging type wireless earphone
CN110830071A (en) * 2019-11-12 2020-02-21 天津津航计算技术研究所 Multi-antenna radio frequency front-end circuit

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