CN204991129U - Audio player based on wireless control - Google Patents
Audio player based on wireless control Download PDFInfo
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- CN204991129U CN204991129U CN201520589463.6U CN201520589463U CN204991129U CN 204991129 U CN204991129 U CN 204991129U CN 201520589463 U CN201520589463 U CN 201520589463U CN 204991129 U CN204991129 U CN 204991129U
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Abstract
The utility model discloses an audio player based on wireless control comprises a power module, customer end, the 2nd power module and service end, the customer end includes customer end main control unit, button module and wireless transmitting module, customer end main control unit monitors the control information of button module input, sends control command for wireless transmitting module, and wireless transmitting module sends out the received signal to the service end, the service end includes service end main control unit, wireless receiving module, MP3 decoder module, SD card module and TFT display module, the signal that wireless transmitting module sent is received to the wireless receiving module to give service end main control unit with this signal transmission, service end main control unit received signal is analytic, and the content of the receipt file in with the SD card module buffers that read in draw main information and send the TFT module to and show to in time play the file transfer to MP3 decoder module. This system power dissipation is low, with low costs, portable, stable, visual strong.
Description
Technical field
The utility model relates to a kind of music playing system, belongs to music control technology field, particularly relates to controlled in wireless music Play Control technical field.
Background technology
Music player is as human lives and the indispensable part of amusement, and its intelligent development is trend of the times, the important component part of its intelligentized control method Smart Home especially.Home intelligence is suggested as concept first, is the U.S. in eighties of last century, then achieves in other developed countries and is in progress fast, comprising the state such as European, Japanese.In China, caused by present status in China, home intelligence system is just introduced into domestic very late, is approximately in latter stage in last century, but due to its speed of development very fast, even to this day, there is considerable intelligent dwelling and intelligent residential district.
Household electronic, house automation and home intelligence are three main developing stages of Smart Home.Music player based on controlled in wireless is just in the home intelligence stage, and STM32 Series MCU is widely used in this field because of its superior cost performance and flexile functional configuration, and based on the design of 2.4G controlled in wireless, music player is made to break away from wired constraint, more simple and convenient, more intelligent.
Utility model content
The utility model in order to the real-time display problem of the controlled in wireless and multimedia messages that solve music player, will provide a kind of music player based on controlled in wireless.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: based on the music player of controlled in wireless, and this music player is made up of the first power module, client, second source module and service end; Described client comprises client master controller, key-press module and wireless transmitter module; Described key-press module is used for input control information; The control information of key-press module input monitored by described client master controller, and generate corresponding control command according to key information and be sent to wireless transmitter module, digital signal is converted to radio frequency signal and is sent to service end by wireless transmitter module;
Described service end comprises service end master controller, wireless receiving module, MP3 decoding module, SD card module and TFT display module; Described wireless receiving module receives the signal that wireless transmitter module sends, and by this Signal transmissions to service end master controller; Service end master controller Received signal strength is also resolved, and the file in SD card module is read in buffer zone by the content according to receiving, and extracts main information and delivers to TFT module and show, and transfers the file to MP3 decoding module in time and play.
Further, the first described power module and second source module are used for+5V voltage transitions to become+3.3V voltage, comprise connection terminal, LM1117-3.3 linear power supply, LC filtering circuit, a pin of connection terminal connects the input end of LM1117-3.3 linear power supply, the output terminal of LM1117-3.3 linear power supply connects LC filtering circuit, and LC filtering circuit comprises electrochemical capacitor C1, electrodeless electric capacity C2, electrochemical capacitor C3, electrodeless electric capacity C4 and inductor L1; The positive pole of electrochemical capacitor C1 is connected with the output terminal of LM1117-3.3 linear power supply and one end of inductor L1 with one end of electrodeless electric capacity C2, the negative pole of electrochemical capacitor C1 and the other end ground connection of electrodeless electric capacity C2; The positive pole of electrochemical capacitor C3 is connected with the other end of inductor L1 with one end of electrodeless electric capacity C4, the negative pole of electrochemical capacitor C3 and the other end ground connection of electrodeless electric capacity C4.
Further, described client master controller and described service end master controller adopt STM32F103 main control chip; Described STM32F103 main control chip connects JTAG chip, the first crystal oscillating circuit, the second crystal oscillating circuit and reset circuit;
72 pin of STM32F103 main control chip, 76 pin, 77 pin and 91 pin are connected with 14 pin of JTAG chip, 12 pin, 16 pin and 17 pin respectively; 19 pin of described JTAG chip are connected power supply with 20 pin, ground connection after 8 pin, 4 pin and 2 pin difference contact resistance R2, resistance R3 and resistance R4, all the other pin ground connection of JTAG chip;
Described first crystal oscillating circuit is made up of crystal oscillator X2, electric capacity C5 and electric capacity C6; 12 pin of STM32F103 main control chip connect one end of crystal oscillator X2 and electric capacity C5, the other end ground connection of electric capacity C5; 13 pin of STM32F103 main control chip connect the other end of crystal oscillator X2 and one end of electric capacity C6, the other end ground connection of electric capacity C6;
Described second crystal oscillating circuit is made up of crystal oscillator X3, electric capacity C7 and electric capacity C8; 9 pin of STM32F103 main control chip connect one end of crystal oscillator X3 and electric capacity C7, the other end ground connection of electric capacity C7; 8 pin of STM32F103 main control chip connect the other end of crystal oscillator X3 and one end of electric capacity C8, the other end ground connection of electric capacity C8;
Described reset circuit comprises reset switch S1 and electric capacity C9, and reset switch S1 is connected with 14 pin of STM32F103 main control chip with electric capacity C9 parallel connection;
37 pin connecting valve S2 of described STM32F103 main control chip, connect high level or ground connection by S2 switch control rule; 94 pin connecting valve S3 of described STM32F103 main control chip, connect high level or ground connection by S3 switch control rule.
Further, described wireless transmitter module and described wireless receiving module adopt NRF24L01 chip; Described NRF24L01 chip is connected with filtering circuit, resonant circuit and crystal oscillating circuit, and described filtering circuit comprises electric capacity C10 and electric capacity C11; Described resonant circuit comprises electric capacity C12 and resistance R1; Described crystal oscillating circuit comprises electric capacity C13, electric capacity C14 and crystal oscillator X; 7 pin of NRF24L01 chip, 15 pin, 18 pin connect one end and the power supply of electric capacity C10 and electric capacity C11, the other end ground connection of electric capacity C10 and electric capacity C11; 8 pin of NRF24L01 chip, 11 pin, 12 pin, 13 pin, 14 pin ground connection; 9 pin of NRF24L01 chip connect one end of crystal oscillator X1 and one end of electric capacity C13, the other end ground connection of electric capacity C13; 10 pin of NRF24L01 chip connect the other end of crystal oscillator X1 and one end of electric capacity C14, the other end ground connection of electric capacity C14; One end of 16 pin connecting resistance R1 of NRF24L01 chip, the other end of resistance R1 connects one end of electric capacity C12, and the other end of electric capacity C12 connects 19 pin; 17 pin of NRF24L01 chip and 20 pin ground connection.
Further, described service end master controller adopts SPI interface and SD card module to carry out data communication.
Further, described MP3 decoding module adopts VS1003B as the decoding chip of audio file, MP3 decoding module is communicated by spi bus with service end master controller, service end master controller imports the audio data stream of compressed format into VS1003B decoding chip, after VS1003B decoding chip carries out hard decoder, digital signal is converted to simulated audio signal and export EARPHONE interface to, carry out the broadcasting of music for earphone or audio amplifier.
Further, described TFT display module adopts the very color LCDs of the TFT of 16 color depths, and real-time exhibition is just in the relevant information of played songs, and described TFT display module separates with service end master controller powers.
The beneficial effects of the utility model: system of the present utility model is by master controller, wireless communication module, and SD card module, MP3 decoding module, TFT display module and key-press module are formed.System is using STM32F103 single-chip microcomputer as control center, client sends corresponding control information to wireless transmitter module by detecting keys interrupt, service end is by wireless receiving module receiving control information, complete music, volume adjusting, the operations such as song switching, and by TFT display screen, multimedia messages and control information are shown.Native system, except having the advantage of low-power consumption, low cost, also has the characteristics such as portable, stable, visuality is strong concurrently.
Accompanying drawing explanation
Fig. 1 is the hardware circuit block diagram of system of the present utility model.
The circuit diagram of Fig. 2 power module.
Fig. 3 STM32F103 main control chip circuit diagram.
Fig. 4 wireless communication module circuit diagram.
Fig. 5 system flowchart.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is elaborated.
If Fig. 1 is the music player based on controlled in wireless of the present utility model, this music player is made up of the first power module, client, second source module and service end; Described client comprises client master controller, key-press module and wireless transmitter module; Described key-press module is used for input control information; The control information of key-press module input monitored by described client master controller, and generate corresponding control command according to key information and be sent to wireless transmitter module, digital signal is converted to radio frequency signal and is sent to service end by wireless transmitter module;
Service end comprises service end master controller, wireless receiving module, MP3 decoding module, SD card module and TFT display module; Described wireless receiving module receives the signal that wireless transmitter module sends, and by this Signal transmissions to service end master controller; Service end master controller Received signal strength is also resolved, and the file in SD card module is read in buffer zone by the content according to receiving, and extracts main information and delivers to TFT module and show, and transfers the file to MP3 decoding module in time and play.
System of the present utility model adopts low power dissipation design, and the standard supply voltage of main control chip is+3.3V DC voltage, so need a power module that+5V voltage transitions is become+3.3V voltage when connecing electricity on core board, easy to use.The circuit diagram of power module as shown in Figure 2, comprise connection terminal, LM1117-3.3 linear power supply, LC filtering circuit, a pin of connection terminal connects the input end of LM1117-3.3 linear power supply, the output terminal of LM1117-3.3 linear power supply connects LC filtering circuit, and LC filtering circuit comprises electrochemical capacitor C1, electrodeless electric capacity C2, electrochemical capacitor C3, electrodeless electric capacity C4 and inductor L1; The positive pole of electrochemical capacitor C1 is connected with the output terminal of LM1117-3.3 linear power supply and one end of inductor L1 with one end of electrodeless electric capacity C2, the negative pole of electrochemical capacitor C1 and the other end ground connection of electrodeless electric capacity C2; The positive pole of electrochemical capacitor C3 is connected with the other end of inductor L1 with one end of electrodeless electric capacity C4, the negative pole of electrochemical capacitor C3 and the other end ground connection of electrodeless electric capacity C4.
Client master controller and service end master controller adopt STM32F103 main control chip; The clock frequency of this chip high speed, abundant peripheral hardware, with interface and to the multistage nested support of interruption, makes it produce high efficiency of code execution and data processing responding ability, limited storage space represents the splendid performance that ARM kernel brings.And its FSMC multiplex interface carried and SDIO interface, the design that is highly advantageous to efficiently refreshes TFT display frequently fast, reads audio file, saves system time, reduces system power dissipation.For needing the system of carrying out a large amount of floating-point operation or real-time Data Transmission, this kind of chip is the high selection of a cost performance.
The circuit diagram of STM32F103 main control chip enters shown in Fig. 3, STM32F103 main control chip connects JTAG chip, the first crystal oscillating circuit, the second crystal oscillating circuit and reset circuit;
72 pin of STM32F103 main control chip, 76 pin, 77 pin and 91 pin are connected with 14 pin of JTAG chip, 12 pin, 16 pin and 17 pin respectively; 19 pin of described JTAG chip are connected power supply with 20 pin, ground connection after 8 pin, 4 pin and 2 pin difference contact resistance R2, resistance R3 and resistance R4, all the other pin ground connection of JTAG chip;
Described first crystal oscillating circuit is made up of crystal oscillator X2, electric capacity C5 and electric capacity C6; 12 pin of STM32F103 main control chip connect one end of crystal oscillator X2 and electric capacity C5, the other end ground connection of electric capacity C5; 13 pin of STM32F103 main control chip connect the other end of crystal oscillator X2 and one end of electric capacity C6, the other end ground connection of electric capacity C6;
Described second crystal oscillating circuit is made up of crystal oscillator X3, electric capacity C7 and electric capacity C8; 9 pin of STM32F103 main control chip connect one end of crystal oscillator X3 and electric capacity C7, the other end ground connection of electric capacity C7; 8 pin of STM32F103 main control chip connect the other end of crystal oscillator X3 and one end of electric capacity C8, the other end ground connection of electric capacity C8;
Described reset circuit comprises reset switch S1 and electric capacity C9, and reset switch S1 is connected with 14 pin of STM32F103 main control chip with electric capacity C9 parallel connection;
37 pin connecting valve S2 of described STM32F103 main control chip, connect high level or ground connection by S2 switch control rule; 94 pin connecting valve S3 of described STM32F103 main control chip, connect high level or ground connection by S3 switch control rule.
Wireless transmitter module and described wireless receiving module adopt NRF24L01 chip; NRF24L01 chip operation is in free ISM band, and frequency of operation is about 2.4GHz.This kind of radio receiving transmitting module dynamically arranges its output power and channel selection by SPI interface, and be highly advantageous to reduction system power dissipation.The frequency generator of chip internal is the core of wireless transmit, is the source of signal, and in addition, chip internal also comprises various power amplifier, and modulator and detuner realize the transmission to signal and reception.NRF24L01 has 20 pins, and inside comprises abundant control register, and external terminal leaves SPI communication interface, and MCU carries out initial configuration chronologically by all kinds of registers of SPI interface to chip internal.The circuit diagram of NRF24L01 chip as shown in Figure 4, NRF24L01 chip is connected with filtering circuit, resonant circuit and crystal oscillating circuit, and described filtering circuit comprises electric capacity C10 and electric capacity C11; Described resonant circuit comprises electric capacity C12 and resistance R1; Described crystal oscillating circuit comprises electric capacity C13, electric capacity C14 and crystal oscillator X1; 7 pin of NRF24L01 chip, 15 pin, 18 pin connect one end and the power supply of electric capacity C10 and electric capacity C11, the other end ground connection of electric capacity C10 and electric capacity C11; 8 pin of NRF24L01 chip, 11 pin, 12 pin, 13 pin, 14 pin ground connection; 9 pin of NRF24L01 chip connect one end of crystal oscillator X1 and one end of electric capacity C13, the other end ground connection of electric capacity C13; 10 pin of NRF24L01 chip connect the other end of crystal oscillator X1 and one end of electric capacity C14, the other end ground connection of electric capacity C14; One end of 16 pin connecting resistance R1 of NRF24L01 chip, the other end of resistance R1 connects one end of electric capacity C12, and the other end of electric capacity C12 connects 19 pin; 17 pin of NRF24L01 chip and 20 pin ground connection.
SD card module is for providing the hardware interface of SD and MicroSD card, and be master controller operation music, the multimedia resources such as picture provide control and data transmission interface simultaneously.The read-write of SD card file refers to that service end master controller is by the data in data communication interface read-write SD card/TF card.SD card, as a kind of flash storage medium of low-voltage, provides SDIO/SPI two kinds of communication interfaces.For SDIO bus, its distinguishing feature is exactly that read or write speed is fast, and data line is many, but operation is comparatively complicated, and for spi bus agreement, its data rate is relatively slow, and the pin taken is less, operates easier.In embedded systems, in order to integrated, the collection of data and store and adopt SD card and USB flash disk more, and due to the volume of SD card and draw-in groove less compared with USB flash disk, apply widely so SD card obtains in embedded systems.In the utility model, master controller adopts SPI interface and SD card module to carry out data communication.
MP3 decoding module adopts VS1003B as the decoding chip of audio file, MP3 decoding module is communicated by spi bus with service end master controller, service end master controller imports the audio data stream of compressed format into VS1003B decoding chip, after VS1003B decoding chip carries out hard decoder, digital signal is converted to simulated audio signal and export EARPHONE interface to, carry out the broadcasting of music for earphone or audio amplifier.
TFT display module adopts the very color LCDs of the TFT of 16 color depths, and real-time exhibition is just in the relevant information of played songs.TFT LCD MODULE has following characteristic: high-contrast, strong stereovision, in riotous profusion colorful color, abundant displaying contents, splendid man-machine interaction effect.
TFT liquid-crystal display section is most important Man Machine Interface in the design, its Major Function be responsible real-time exhibition just in the relevant information of played songs, comprise song title, song T.T., song current schedules, title of volume and the design etc.Because the current drain of TFT module is comparatively large, in order to avoid supply voltage deficiency causes screen flicker, this module needs to separate with MCU module to power, to ensure system stability.
The design of the software of system of the present utility model: the music player system based on controlled in wireless have employed STM32F103 single-chip microcomputer as control center, realizes by programming.Main program flow as shown in Figure 5, when program starts, first carries out sequence initializes to the inner each module of client master controller, then carries out the interruption registration of key-press module and the initialization operation of wireless transmitter module.Controlling pressing of button by monitoring, triggering wireless transmitter module and sending corresponding control information to service end.
For service end, will carry out initialization operation to modules equally, the module related to is more, comprises wireless receiving module, SD card module, MP3 decoding module, TFT display module etc.Service end master controller arranges wireless receiving module with interrupt mode receiving control information, save system overhead, when control information arrives, file in SD card module is read in buffer zone, extract main information to deliver to TFT module and show, and transfer the file to MP3 decoding module in time and play.When there being new control information to arrive, repeat above process, whole system design is higher to requirement of real-time, should reduce system consumption as far as possible, carry out code optimization.
This system achieves the controlled in wireless of music player and multidate information shows, and music whole structure is good.Done experimental verification by following experiment to this system, specific experiment content is as follows:
(1) environmental testing: this system is positioned in complicated wireless communications environment, this environment comprises other 2.4G wireless signal (channel different), parametric controller is positioned over hundred meters of distant places, still can perform all radio control operations accurately (to comprise song to switch, volume adjusting etc.), whole system work is good, and playback of songs is smooth and easy, shows errorless.
(2) burn-in test: work 3 days that the design is started shooting continuously, 72 hours.Experimental result is desirable, and design can normally work more than 72 hours continuously.
(3) Low-power test: design is powered by GWinstek DCPS digitally controlled power source, size of current during observation duty.Experimental result is below 100mA, and this electric current is mainly TFT liquid crystal and consumes.
The experimental result of carrying out from controlled in wireless distance, broadcasting fluency, reception several aspect such as error rate and response time this system is as shown in table 1.
Table 1 experimental result
| Controlled in wireless distance (m) | Play fluency (%) | Receive error rate (%) | Response time (ms) |
| 10 | 100 | 0 | 0.5 |
| 50 | 99.8 | 0.2 | 0.8 |
| 100 | 98.3 | 1.8 | 1.7 |
| 200 | 97.9 | 4.7 | 3.9 |
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (7)
1. based on the music player of controlled in wireless, it is characterized in that: this music player is made up of the first power module, client, second source module and service end; Described client comprises client master controller, key-press module and wireless transmitter module; Described key-press module is used for input control information; The control information of key-press module input monitored by described client master controller, and generate corresponding control command according to key information and be sent to wireless transmitter module, digital signal is converted to radio frequency signal and is sent to service end by wireless transmitter module;
Described service end comprises service end master controller, wireless receiving module, MP3 decoding module, SD card module and TFT display module; Described wireless receiving module receives the signal that wireless transmitter module sends, and by this Signal transmissions to service end master controller; Service end master controller Received signal strength is also resolved, and the file in SD card module is read in buffer zone by the content according to receiving, and extracts main information and delivers to TFT module and show, and transfers the file to MP3 decoding module in time and play.
2. the music player based on controlled in wireless according to claim 1, it is characterized in that: the first described power module and second source module are used for+5V voltage transitions to become+3.3V voltage, comprise connection terminal, LM1117-3.3 linear power supply, LC filtering circuit, a pin of connection terminal connects the input end of LM1117-3.3 linear power supply, the output terminal of LM1117-3.3 linear power supply connects LC filtering circuit, and LC filtering circuit comprises electrochemical capacitor C1, electrodeless electric capacity C2, electrochemical capacitor C3, electrodeless electric capacity C4 and inductor L1; The positive pole of electrochemical capacitor C1 is connected with the output terminal of LM1117-3.3 linear power supply and one end of inductor L1 with one end of electrodeless electric capacity C2, the negative pole of electrochemical capacitor C1 and the other end ground connection of electrodeless electric capacity C2; The positive pole of electrochemical capacitor C3 is connected with the other end of inductor L1 with one end of electrodeless electric capacity C4, the negative pole of electrochemical capacitor C3 and the other end ground connection of electrodeless electric capacity C4.
3. the music player based on controlled in wireless according to claim 1, is characterized in that: described client master controller and described service end master controller adopt STM32F103 main control chip; Described STM32F103 main control chip connects JTAG chip, the first crystal oscillating circuit, the second crystal oscillating circuit and reset circuit;
72 pin of STM32F103 main control chip, 76 pin, 77 pin and 91 pin are connected with 14 pin of JTAG chip, 12 pin, 16 pin and 17 pin respectively; 19 pin of described JTAG chip are connected power supply with 20 pin, ground connection after 8 pin, 4 pin and 2 pin difference contact resistance R2, resistance R3 and resistance R4, all the other pin ground connection of JTAG chip;
Described first crystal oscillating circuit is made up of crystal oscillator X2, electric capacity C5 and electric capacity C6; 12 pin of STM32F103 main control chip connect one end of crystal oscillator X2 and electric capacity C5, the other end ground connection of electric capacity C5; 13 pin of STM32F103 main control chip connect the other end of crystal oscillator X2 and one end of electric capacity C6, the other end ground connection of electric capacity C6;
Described second crystal oscillating circuit is made up of crystal oscillator X3, electric capacity C7 and electric capacity C8; 9 pin of STM32F103 main control chip connect one end of crystal oscillator X3 and electric capacity C7, the other end ground connection of electric capacity C7; 8 pin of STM32F103 main control chip connect the other end of crystal oscillator X3 and one end of electric capacity C8, the other end ground connection of electric capacity C8;
Described reset circuit comprises reset switch S1 and electric capacity C9, and reset switch S1 is connected with 14 pin of STM32F103 main control chip with electric capacity C9 parallel connection;
37 pin connecting valve S2 of described STM32F103 main control chip, connect high level or ground connection by S2 switch control rule; 94 pin connecting valve S3 of described STM32F103 main control chip, connect high level or ground connection by S3 switch control rule.
4. the music player based on controlled in wireless according to claim 1, is characterized in that: described wireless transmitter module and described wireless receiving module adopt NRF24L01 chip; Described NRF24L01 chip is connected with filtering circuit, resonant circuit and crystal oscillating circuit, and described filtering circuit comprises electric capacity C10 and electric capacity C11; Described resonant circuit comprises electric capacity C12 and resistance R1; Described crystal oscillating circuit comprises electric capacity C13, electric capacity C14 and crystal oscillator X; 7 pin of NRF24L01 chip, 15 pin, 18 pin connect one end and the power supply of electric capacity C10 and electric capacity C11, the other end ground connection of electric capacity C10 and electric capacity C11; 8 pin of NRF24L01 chip, 11 pin, 12 pin, 13 pin, 14 pin ground connection; 9 pin of NRF24L01 chip connect one end of crystal oscillator X1 and one end of electric capacity C13, the other end ground connection of electric capacity C13; 10 pin of NRF24L01 chip connect the other end of crystal oscillator X1 and one end of electric capacity C14, the other end ground connection of electric capacity C14; One end of 16 pin connecting resistance R1 of NRF24L01 chip, the other end of resistance R1 connects one end of electric capacity C12, and the other end of electric capacity C12 connects 19 pin; 17 pin of NRF24L01 chip and 20 pin ground connection.
5. the music player based on controlled in wireless according to claim 1, is characterized in that: described service end master controller adopts SPI interface and SD card module to carry out data communication.
6. the music player based on controlled in wireless according to claim 1, it is characterized in that: described MP3 decoding module adopts VS1003B as the decoding chip of audio file, MP3 decoding module is communicated by spi bus with service end master controller, service end master controller imports the audio data stream of compressed format into VS1003B decoding chip, after VS1003B decoding chip carries out hard decoder, digital signal is converted to simulated audio signal and export EARPHONE interface to, carry out the broadcasting of music for earphone or audio amplifier.
7. the music player based on controlled in wireless according to claim 1, it is characterized in that: described TFT display module adopts the very color LCDs of the TFT of 16 color depths, real-time exhibition is just in the relevant information of played songs, and described TFT display module separates with service end master controller powers.
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| CN201520589463.6U CN204991129U (en) | 2015-08-07 | 2015-08-07 | Audio player based on wireless control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109966154A (en) * | 2019-04-30 | 2019-07-05 | 临沂大学 | Old man's alarm for medicine taking |
| CN110060718A (en) * | 2019-05-05 | 2019-07-26 | 绍兴文理学院元培学院 | A kind of MP3 player |
| CN109194654B (en) * | 2018-09-06 | 2024-02-02 | 山西特信环宇信息技术有限公司 | Electronic official seal management and control system and method based on certificate chain technology |
-
2015
- 2015-08-07 CN CN201520589463.6U patent/CN204991129U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194654B (en) * | 2018-09-06 | 2024-02-02 | 山西特信环宇信息技术有限公司 | Electronic official seal management and control system and method based on certificate chain technology |
| CN109966154A (en) * | 2019-04-30 | 2019-07-05 | 临沂大学 | Old man's alarm for medicine taking |
| CN110060718A (en) * | 2019-05-05 | 2019-07-26 | 绍兴文理学院元培学院 | A kind of MP3 player |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20170807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |