CN216904883U - UHF frequency channel receiver of guide explanation machine and guide explanation machine - Google Patents
UHF frequency channel receiver of guide explanation machine and guide explanation machine Download PDFInfo
- Publication number
- CN216904883U CN216904883U CN202220579070.7U CN202220579070U CN216904883U CN 216904883 U CN216904883 U CN 216904883U CN 202220579070 U CN202220579070 U CN 202220579070U CN 216904883 U CN216904883 U CN 216904883U
- Authority
- CN
- China
- Prior art keywords
- uhf
- frequency band
- uhf frequency
- receiver
- receiving chip
- 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.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
The utility model discloses a UHF frequency band receiver of a guide explaining machine and the guide explaining machine, wherein the receiver comprises a UHF frequency band receiving chip, an antenna, a low-noise signal amplifier, a singlechip, an audio power amplifier, an earphone jack and a power supply circuit; the antenna, the low-noise signal amplifier and the UHF frequency band receiving chip are sequentially and electrically connected, and the low-noise signal amplifier amplifies the power of a wireless signal received by the antenna, and sends the wireless signal to the UHF frequency band receiving chip for processing and converting the wireless signal into an audio signal; the audio power amplifier is electrically connected with the UHF frequency band receiving chip and the earphone jack; the single chip microcomputer is electrically connected with the UHF frequency band receiving chip and the audio power amplifier; the power circuit is electrically connected with the single chip microcomputer, the UHF frequency band receiving chip, the low-noise signal amplifier and the audio power amplifier. The utility model makes the UHF frequency band receiver of the guide explaining machine have long working distance, reduces interference and lowers cost.
Description
Technical Field
The utility model relates to the technical field of tour guide interpreters, in particular to a UHF frequency band receiver of a tour guide interpreter and the tour guide interpreter.
Background
The tour guide explaining machine is used for explaining tourists to listen in a tour guide of scenic spots and comprises a transmitter and a receiver. The transmitter is worn by the tourist, the voice explained by the tourist is collected by the transmitter and transmitted outwards, the receiver is worn by the tourist, and the receiver receives the voice signal sent by the transmitter and decodes and plays the voice signal for the tourist to listen to.
The receiver products on the market mainly comprise a 2.4G digital frequency hopping scheme, a UHF frequency band single-chip scheme and a UHF frequency band ultra-inner difference split type receiving scheme.
The receiver of the UHF frequency band single-chip scheme has good sound effect, but the receiver of the scheme has the following problems:
the first is the problem of short working distance;
secondly, the number of channels is small, and the problem of interference is easy to occur;
thirdly, the circuit is complex and costly.
Therefore, the prior art has yet to be improved.
SUMMERY OF THE UTILITY MODEL
In view of the above disadvantages of the prior art, the present invention is directed to a UHF-band receiver of a tour guide interpreter, which is designed to make the UHF-band receiver of the tour guide interpreter have a long working distance, reduce interference, and reduce cost.
In order to realize the purpose, the utility model adopts the following technical scheme:
a UHF frequency band receiver of a guide explaining machine comprises:
the system comprises a UHF frequency band receiving chip, an antenna, a low-noise signal amplifier, a singlechip, an audio power amplifier, an earphone jack and a power circuit;
the antenna, the low-noise signal amplifier and the UHF frequency band receiving chip are sequentially and electrically connected, and the low-noise signal amplifier amplifies the power of a wireless signal received by the antenna, and sends the wireless signal to the UHF frequency band receiving chip for processing and converting the wireless signal into an audio signal;
the audio power amplifier is electrically connected with the UHF frequency band receiving chip and the earphone jack, and is used for amplifying the power of the audio signal output by the UHF frequency band receiving chip and then transmitting the amplified audio signal to the earphone jack;
the single chip microcomputer is electrically connected with the UHF frequency band receiving chip and the audio power amplifier, and controls the working states of the UHF frequency band receiving chip and the audio power amplifier;
the power circuit is electrically connected with the single chip microcomputer, the UHF frequency band receiving chip, the low-noise signal amplifier and the audio power amplifier.
And a matching network is also connected between the low-noise signal amplifier and the UHF frequency band receiving chip, and the matching network is formed by connecting a plurality of capacitors and inductors in series and/or in parallel.
The model of the UHF frequency band receiving chip is KT 0656M.
The low-noise signal amplifier is a field effect transistor, and the type of the field effect transistor is BF1212 WR.
The chip model of the audio power amplifier is SGM4809 or BK 09.
The chip model of the single chip microcomputer is SC5108F16 or GB51F 2832.
The power supply circuit comprises a battery charging management chip, a lithium battery, a power supply switch and a voltage stabilizer;
the battery charging management chip is electrically connected with a USB charging interface, a 5V power supply input port and the lithium battery, the power supply switch is connected with the lithium battery, the voltage stabilizer and the audio power amplifier, and the voltage stabilizer outputs stable voltage to the single chip microcomputer, the UHF frequency band receiving chip and the low-noise signal amplifier.
The model of the battery charging management chip is XT 2052;
the regulator is A3V regulator, and is LM1134A302 MR.
A battery low-voltage detection circuit is connected between the single chip microcomputer and the lithium battery;
and an isolation magnetic bead is also connected between the voltage stabilizer and the UHF frequency band receiving chip.
The utility model also provides a tour guide interpreter, which comprises the receiver and a transmitter for transmitting wireless signals to the receiver.
It is understood that within the scope of the present invention, the above-mentioned technical features of the present invention and those specifically described below (in the embodiments) can be combined with each other to constitute a new or preferred technical solution, to be limited to space, and not to be described in any more detail herein.
According to the UHF frequency band receiver of the tour guide interpreter, the low-noise signal amplifier is additionally arranged at the antenna receiving end, the amplification gain is improved, the receiving distance is improved, meanwhile, the UHF frequency band receiving chip is adopted, the number of channels is large, interference can be effectively avoided, meanwhile, the UHF frequency band receiving chip is also internally provided with an audio processing function, a received wireless information number can be directly decoded and converted into audio, a circuit is simplified, and the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a first embodiment of a UHF band receiver of the tourist guide interpreter according to the present invention;
FIG. 2 is a schematic diagram of the circuit connections of a single chip in the receiver circuit;
FIG. 3 is a schematic diagram of the circuit connections of the display screen in the receiver circuit;
FIG. 4 is a schematic diagram of the circuit connection between the UHF band receiving chip and the matching network in the receiver circuit;
FIG. 5 is a schematic diagram of the electrical connections of the antenna and low noise signal amplifier in the receiver circuit;
FIG. 6 is a schematic diagram of the electrical connections of the audio power amplifier and the headphone jack;
FIG. 7 is a schematic diagram of the circuit connections of the battery charge management chip, the lithium battery, and the power switch;
FIG. 8 is a circuit diagram of the voltage regulator.
Description of reference numerals:
the system comprises a 100-receiver, a 1-UHF frequency band receiving chip, a 2-antenna, a 3-low noise signal amplifier, a 4-single chip microcomputer, a 5-audio power amplifier, a 6-earphone jack, a 7-power circuit, a 71-battery charging management chip, a 72-lithium battery, a 73-power switch, a 74-voltage stabilizer, an 8-matching network, a 91-USB charging interface, a 92-5V power input port, a 10-battery low-voltage detection circuit, 11-isolation magnetic beads, 12-keys, 13-LED backlight lamps and a 14-display screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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 at least one such feature.
Referring to fig. 1, the present invention provides a UHF-band receiver 100 for a tour guide interpreter, which includes: the device comprises a UHF frequency band receiving chip 1, an antenna 2, a low-noise signal amplifier 3, a singlechip 4, an audio power amplifier 5, an earphone jack 6 and a power circuit 7. The antenna 2 of the present invention employs a spring antenna. The earphone jack 6 is used for plugging an external earphone.
The antenna 2, the low-noise signal amplifier 3 and the UHF frequency band receiving chip 1 are electrically connected in sequence, the low-noise signal amplifier 3 amplifies the power of the wireless signal received by the antenna 2, and sends the wireless signal to the UHF frequency band receiving chip 1 for processing and converting the wireless signal into an audio signal.
The antenna 2 receives an audio signal sent by a transmitter of the guide explaining machine, then the audio signal is amplified by the low-noise signal amplifier 3 and sent to the UHF frequency band receiving chip 1, and the UHF frequency band wireless signal is processed, such as signal demodulation, meanwhile, the UHF frequency band receiving chip 1 can directly convert the demodulated signal into the audio signal without a special independent audio processor. Namely, the UHF-band receiving chip 1 of the present invention has an audio processor built therein, which can receive wireless signals and directly convert and output audio signals.
The audio power amplifier 5 of the receiver 100 of the present invention is electrically connected to the UHF band receiving chip 1 and the earphone jack 6, and amplifies the power of the audio signal output from the UHF band receiving chip 1 and transmits the amplified audio signal to the earphone jack 6. The audio power amplifier 5 can drive an external earphone connected to the earphone jack 6 to play audio.
The single chip microcomputer 4 of the receiver 100 of the present invention is electrically connected to the UHF band receiving chip 1 and the audio power amplifier 5, and the single chip microcomputer 4 controls the operating states of the UHF band receiving chip 1 and the audio power amplifier 5. If the singlechip 4 sets the working state of the UHF frequency band receiving chip 1, the working frequency, the pilot frequency parameter and the like of the UHF frequency band receiving chip are controlled; controlling the audio power amplifier 5 to switch, enable, etc.
The power circuit 7 is electrically connected with the singlechip 4, the UHF frequency band receiving chip 1, the low-noise signal amplifier 3 and the audio power amplifier 5. And the power circuit 7 supplies power to the singlechip 4, the UHF frequency band receiving chip 1, the low-noise signal amplifier 3 and the audio power amplifier 5.
The receiver 100 of the present invention can increase the receiving capability of the antenna due to the low noise signal amplifier 3 adopted at the antenna end, so that the long-distance signal can be received, and thus, the working distance of the receiver 100 of the present invention is increased compared with the receiver of the prior art, and the receiver is suitable for long-distance work, so as to ensure that each visitor at different positions far and near can clearly receive the signal.
Meanwhile, because the receiver 100 of the present invention employs the UHF-band receiving chip 1, compared with the prior art, the receiver of the present invention has an audio processor integrated therein, and can directly decode the demodulated signal, convert the demodulated signal into audio, and output the audio, thereby optimizing the circuit structure of the entire receiver 100 and reducing the cost. Thirdly, the UHF-band receiving chip 1 of the present invention has a plurality of channels, which can solve the problem of interference generated by the adjacent channels.
Preferably, the single chip 4 of the present invention is further connected with a key 12, a display screen 14 and an LED backlight 13 of the display screen. The keys 12 can perform volume adjustment, receive channel selection, and the like. The display 14 can display the working status, channel, battery level, etc., and preferably, as shown in fig. 3, the display 14 of the present invention is an LCD display. The LED backlight 13 provides backlight for the display screen 14.
Specifically, as shown in fig. 2, the chip model of the single chip microcomputer 4 of the present invention is SC5108F16 or GB51F 2832.
The single chip 4 of the utility model is mainly responsible for the following functions:
1. and the volume adjusting keys S1 and S2 and the channel selecting keys S3 and S4 of the product are responsible for operating and driving the LCD to display.
2. And the UHF frequency band receiving chip 1 is in data communication, the working state of the UHF frequency band receiving chip 1 is set, and the working frequency, the pilot frequency parameter, the volume and the like of the UHF frequency band receiving chip are controlled.
3. And is responsible for low voltage detection of the battery and control of the LED backlight 13 of the LCD display screen.
Preferably, as shown in fig. 1, a matching network 8 is further connected between the low-noise signal amplifier 3 and the UHF-band receiving chip 1, the matching network 8 performs matching selection on a UHF-band radio frequency signal, and the matching network 8 is formed by connecting a plurality of capacitors and inductors in series and/or in parallel, specifically, as shown in fig. 4, the matching network 8 of this embodiment is formed by C62, C10, C9, L5, C16, and the like.
Specifically, as shown in fig. 4, the model of the UHF-band receiving chip 1 of the present invention is KT 0656M.
KT0656M chip has built-in radio frequency generator, RF low noise amplifier, FM demodulator, high fidelity audio frequency treater. The chip works in 470-960MHz frequency band, and in the broadband design, a plurality of frequency channels can be set, thereby solving the problem that a plurality of transmitters work simultaneously to generate same frequency or adjacent frequency interference. Meanwhile, a plurality of functional modules of the chip set directly convert received wireless signals into audio signals for output after amplification and demodulation inside the chip, thereby greatly optimizing circuit design, simplifying production procedures and reducing production cost.
As shown in fig. 5, the low noise amplifier 3 of the present invention is a field effect transistor, and the type of the field effect transistor is BF1212 WR. The BF1212WR FET amplifies the signal received by the antenna 2, and can provide 3-5dB amplification gain for the whole receiver, so as to improve the receiving distance, and the working distance of the receiver 100 of the utility model can be more than or equal to 100 meters.
As shown in fig. 6, the chip type of the audio power amplifier 5 of the receiver 100 of the present invention is SGM4809 or BK 09.
The utility model adopts SGM4809 or BK09 chips to form the audio power amplifier of the earphone, which can ensure enough power to drive the external earphone inserted in the earphone insertion port 6 and ensure the playing quality.
Further, as shown in fig. 1, 7 and 8, the power supply circuit 7 of the receiver 100 of the present invention includes a battery charging management chip 71, a lithium battery 72, a power switch 73 and a voltage regulator 74. The battery charge management chip 71 manages the charging and discharging of the lithium battery 72, the power switch 73 controls the on and off of the entire receiver 100, and the voltage stabilizer 74 converts the output voltage of the lithium battery 72 into a stable operating voltage.
The battery charging management chip 71 is electrically connected with a USB charging interface 91, a 5V power input port 92 and the lithium battery 72, the power switch 73 is connected with the lithium battery 72, the voltage stabilizer 74 and the audio power amplifier 5, and the voltage stabilizer 74 outputs a stable voltage to the single chip microcomputer 4, the UHF band receiving chip 1 and the low noise signal amplifier 3. The USB charging interface 91 may be directly connected to an external power source through a USB cable, and the 5V power input port 92 is connected to an external 5V power source, for example, a dedicated 5V charging box with multiple output ports, the 5V power input port 92 on the receiver 100 may be a contact, and the output port of the dedicated 5V charging box may be a thimble, and the thimble abuts against the contact to charge the receiver 100. Thus, the receiver 100 of the present invention can charge the internal lithium battery in two ways. The audio power amplifier 5 is directly powered by the voltage output by the lithium battery 72, and the single chip microcomputer 4, the UHF band receiving chip 1 and the low-noise signal amplifier 3 are powered by the stable working voltage output by the voltage of the lithium battery 72 after being converted by the voltage stabilizer 74.
As shown in fig. 7, the battery charging management chip 71 of the present invention is model XT 2052. The XT2052 chip can charge the lithium battery 72 and protect the lithium battery 72. An LED2 is also connected between the battery charge management chip 71 and the lithium battery 72, and an LED2 indicates the state of charge.
Preferably, the voltage regulator 74 is A3V voltage regulator, model LM1134A302 MR.
The LM1134A302MR chip provides 3V direct current voltage for the singlechip 4, the UHF frequency band receiving chip 1 and the low noise signal amplifier 3.
Further, as shown in fig. 1 and fig. 2, a battery low voltage detection circuit 10 is connected between the single chip microcomputer 4 and the lithium battery 72, and the battery low voltage detection circuit 10 detects the voltage of the lithium battery 72 and displays the voltage through an LCD.
Preferably, as shown in fig. 1 and fig. 8, an isolation magnetic bead 11 is further connected between the voltage stabilizer 74 and the UHF-band receiving chip 1. The isolation magnetic beads 11 can prevent the input power source from interfering with the operation of the UHF-band receiving chip 1.
The utility model also provides a tour guide interpreter, which comprises the receiver 100 and a transmitter for transmitting wireless signals to the receiver 100. Because the guide explaining machine adopts the receiver 100, the guide explaining machine of the utility model has long working distance and low circuit cost.
According to the UHF frequency band receiver 100 of the guide explaining machine and the guide explaining machine, the low-noise signal amplifier 3 is additionally arranged at the antenna receiving end, amplification gain is improved, the receiving distance is improved, meanwhile, the UHF frequency band receiving chip 1 is adopted, the number of channels is large, interference can be effectively avoided, meanwhile, the UHF frequency band receiving chip 1 is also internally provided with an audio processing function, received wireless information numbers can be directly decoded and converted into audio, the circuit of the receiver 100 is simplified, and the production cost is reduced.
The above description is only for clearly illustrating the utility model and is not therefore to be considered as limiting the scope of the utility model, and all embodiments are not intended to be exhaustive, and all equivalent structural changes made by using the technical solutions of the present invention or other related technical fields directly/indirectly applied under the concept of the present invention are included in the scope of the present invention.
Claims (10)
1. A UHF frequency band receiver of a tour guide explanation machine is characterized by comprising:
the system comprises a UHF frequency band receiving chip, an antenna, a low-noise signal amplifier, a singlechip, an audio power amplifier, an earphone jack and a power circuit;
the antenna, the low-noise signal amplifier and the UHF frequency band receiving chip are sequentially and electrically connected, and the low-noise signal amplifier amplifies the power of a wireless signal received by the antenna, and sends the wireless signal to the UHF frequency band receiving chip for processing and converting the wireless signal into an audio signal;
the audio power amplifier is electrically connected with the UHF frequency band receiving chip and the earphone jack, and is used for amplifying the power of the audio signal output by the UHF frequency band receiving chip and then transmitting the amplified audio signal to the earphone jack;
the single chip microcomputer is electrically connected with the UHF frequency band receiving chip and the audio power amplifier, and controls the working states of the UHF frequency band receiving chip and the audio power amplifier;
the power circuit is electrically connected with the single chip microcomputer, the UHF frequency band receiving chip, the low-noise signal amplifier and the audio power amplifier.
2. The UHF-band receiver of the guide interpretation machine of claim 1, wherein a matching network is further connected between the low noise signal amplifier and the UHF-band receiving chip, and the matching network is formed by connecting a plurality of capacitors and inductors in series and/or in parallel.
3. The UHF band receiver of the tour guide interpreter of claim 1, wherein the model of the UHF band receiving chip is KT 0656M.
4. The UHF-band receiver of the guide explaining machine of claim 1, wherein the low noise signal amplifier is a field effect transistor, and the model of the field effect transistor is BF1212 WR.
5. The UHF-band receiver of a guide vane lecturer according to claim 1, wherein the chip model of the audio power amplifier is SGM4809 or BK 09.
6. The UHF receiver of the tour guide explanation machine of claim 1, characterized in that the chip model of the single chip microcomputer is SC5108F16 or GB51F 2832.
7. The UHF-band receiver of the tour guide interpreter of claim 1, wherein the power circuit includes a battery charge management chip, a lithium battery, a power switch and a voltage stabilizer;
the battery charging management chip is electrically connected with a USB charging interface, a 5V power supply input port and the lithium battery, the power supply switch is connected with the lithium battery, the voltage stabilizer and the audio power amplifier, and the voltage stabilizer outputs stable voltage to the single chip microcomputer, the UHF frequency band receiving chip and the low-noise signal amplifier.
8. The UHF band receiver of the tour guide interpreter of claim 7, wherein the model of the battery charging management chip is XT 2052;
the regulator is A3V regulator, and is LM1134A302 MR.
9. The UHF band receiver of the tour guide explanation machine of claim 7, characterized in that a battery low voltage detection circuit is connected between the single chip microcomputer and the lithium battery;
and an isolation magnetic bead is also connected between the voltage stabilizer and the UHF frequency band receiving chip.
10. A tour guide interpreter comprising a receiver according to any of claims 1-9 and further comprising a transmitter for transmitting a wireless signal to the receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220579070.7U CN216904883U (en) | 2022-03-16 | 2022-03-16 | UHF frequency channel receiver of guide explanation machine and guide explanation machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220579070.7U CN216904883U (en) | 2022-03-16 | 2022-03-16 | UHF frequency channel receiver of guide explanation machine and guide explanation machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216904883U true CN216904883U (en) | 2022-07-05 |
Family
ID=82190759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220579070.7U Active CN216904883U (en) | 2022-03-16 | 2022-03-16 | UHF frequency channel receiver of guide explanation machine and guide explanation machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216904883U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114916092A (en) * | 2022-07-15 | 2022-08-16 | 深圳市盛天龙视听科技有限公司 | Method and system for realizing multi-earphone connection of sound equipment |
-
2022
- 2022-03-16 CN CN202220579070.7U patent/CN216904883U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114916092A (en) * | 2022-07-15 | 2022-08-16 | 深圳市盛天龙视听科技有限公司 | Method and system for realizing multi-earphone connection of sound equipment |
| CN114916092B (en) * | 2022-07-15 | 2022-10-14 | 深圳市盛天龙视听科技有限公司 | Method and system for realizing multi-earphone connection of sound equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20170257692A1 (en) | Low-loss wireless stereo Bluetooth earphones | |
| US20140119555A1 (en) | Earphone device having integrated antenna | |
| CN202998086U (en) | A multi-band double-reception band-crossing duplex relay vehicle station | |
| CN216904883U (en) | UHF frequency channel receiver of guide explanation machine and guide explanation machine | |
| CN102497609B (en) | Wireless network sound system | |
| CN203574831U (en) | In-ear earphone | |
| CN201853806U (en) | Integrated antenna assembly and radio system including same | |
| CN210274425U (en) | UHF wireless transmitter takes bluetooth to receive and monitors musical instrument microphone with earphone | |
| CN201608898U (en) | Microphone wireless sound transmission system | |
| CN217770058U (en) | UHF frequency range transmitter and guide's explanation machine of guide's explanation machine | |
| CN201466210U (en) | Metal object used as antenna plug and electronic device | |
| CN101277158A (en) | Musical instrument wireless transmission system based on 2.4G wireless digital audio technique | |
| CN103682618A (en) | FM (frequency modulation) antenna and terminal equipment | |
| CN1156997C (en) | Radio communication equipment | |
| CN203233410U (en) | Clip-type wireless receiver | |
| CN106817137B (en) | Medium-power VHF/UHF four-band wireless simulation vehicle-mounted station | |
| CN201674486U (en) | Circuit structure for portable radios | |
| CN215420692U (en) | True wireless earphone with high-performance audio output | |
| CN207075067U (en) | Bluetooth microphone based on Aptx LL codings | |
| CN211830763U (en) | Radio frequency front-end circuit and electronic equipment | |
| CN104935352A (en) | Reception device for wireless teaching | |
| CN219642377U (en) | Double Bluetooth wireless control device | |
| CN219087319U (en) | Wireless monitoring system | |
| CN218450478U (en) | Strip-shaped sound box with audio transmitting and receiving functions | |
| CN216901797U (en) | ISM frequency band wireless receiving and dispatching explanation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |