CN105355223A - Novel wireless audio playback system and initialization method therefor - Google Patents
Novel wireless audio playback system and initialization method therefor Download PDFInfo
- Publication number
- CN105355223A CN105355223A CN201510704660.2A CN201510704660A CN105355223A CN 105355223 A CN105355223 A CN 105355223A CN 201510704660 A CN201510704660 A CN 201510704660A CN 105355223 A CN105355223 A CN 105355223A
- Authority
- CN
- China
- Prior art keywords
- module
- audio
- control chip
- main control
- audio frequency
- 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.)
- Withdrawn
Links
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
The invention relates to a novel wireless audio playback system and an initialization method therefor. The initialization method comprises steps of: initializing an SPI configuration parameter and an IO port configuration parameter of a master control chip; the master control chip sending a reset command to a storage interface module, and making an SD card connected to the storage interface module in an idle state; and the master control chip sending a CMD8 command to the storage interface module and detecting whether the SD card to support a 2.0 protocol. The novel wireless audio playback system disclosed by the invention provides a wireless audio transmission system which is convenient to install and use, lines are simple and beautiful due to less wire, and in addition, advantages of rapid initialization, fast startup and stable performance are ensured.
Description
Technical field
The present invention relates to sound system, especially, relate to a kind of novel radio audio frequency broadcast system and initial method thereof.
Background technology
The complicated line of tradition sound system cannot meet people to pursuit that is brief, fashion, and circuit has not only had influence on the specious of sound system, and limits the flexible movement of stereo set, and the problem such as aging of circuit has even shortened the serviceable life of sound equipment.Therefore, the Novel sound box system being necessary to provide a kind of line succinct and initial method thereof.
Summary of the invention
The object of the present invention is to provide a kind of the novel radio audio frequency broadcast system and the initial method thereof that connect up less, be convenient to movement.
A kind of novel radio audio frequency broadcast system, it comprises power module and the main control chip that is connected with power module and the store interface module, display module, load module and the audio-frequency module that are connected with main control chip with power module.Described novel radio audio frequency broadcast system also comprises audio frequency power amplifier module and the wireless sending module that is connected with the output terminal of described audio-frequency module and the wireless receiving module be connected with the audio input end of described audio frequency power amplifier module, described power module comprises the first separate power module and second source module, and the first power module is that described main control chip, store interface module, display module, load module, audio-frequency module and wireless sending module are powered.Described second source module is that described audio frequency power amplifier module and wireless receiving module are powered.Described main control chip is connected with store interface module and audio-frequency module by spi bus.Described store interface module is SD card interface.The initial method of described novel radio audio frequency broadcast system comprises step:
Step one, the SPI configuration parameter of initialization main control chip and I/O port configuration parameter;
Step 2, main control chip sends reset command to described store interface module, makes the SD card be connected with store interface module enter idle condition;
Step 3, main control chip sends CMD8 order to described store interface module, checks whether described SD card supports 2.0 agreements;
Step 4, main control chip sends at least 8 clock signals to described store interface module.
As a kind of embodiment, before execution step 2, described main control chip sends at least 64 clock signals to described store interface module.Preferably, described main control chip sends 10 for synchronous clock signal to store interface module again after described store interface module sends at least 64 clock signals.
As a kind of embodiment, the frequency of described clock signal is less than or equal to 400Khz.
A kind of novel radio audio frequency broadcast system, it comprises power module and the main control chip that is connected with power module and the store interface module, display module, load module and the audio-frequency module that are connected with main control chip with power module.Described novel radio audio frequency broadcast system also comprises audio frequency power amplifier module and the wireless sending module that is connected with the output terminal of described audio-frequency module and the wireless receiving module be connected with the audio input end of described audio frequency power amplifier module, described power module comprises the first separate power module and second source module, first power module is that described main control chip, store interface module, display module, load module, audio-frequency module and wireless sending module are powered, and described second source module is that described audio frequency power amplifier module and wireless receiving module are powered.Described main control chip is connected with store interface module and audio-frequency module by spi bus; Described store interface module is SD card interface.
As a kind of embodiment, the booster circuit that described second source module comprises lithium battery input interface and is connected between lithium battery input interface and audio playing module.
As a kind of embodiment, described booster circuit comprises switching regulator IC, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first electrochemical capacitor, the second electrochemical capacitor, inductance, diode and adjustable resistance; The cathode output end of lithium battery input interface is connected with one end of the input end of switching regulator IC, the first electric capacity, the positive pole of the first electrochemical capacitor; The cmp port of switching regulator IC passes through the series arm ground connection of a resistance and the second electric capacity composition, and its end of convert is connected with the anode of diode, and is connected with its input end by inductance; The negative pole of diode as the output terminal of described booster circuit, and is connected with one end of the 3rd electric capacity with one end of adjustable resistance, the positive pole of the second electrochemical capacitor; The other end of adjustable resistance is connected with one end of the feedback end of switching regulator IC and a divider resistance; The equal ground connection of the other end of the negative pole of the cathode output end of lithium battery input interface, the other end of the first electric capacity, the first electrochemical capacitor, the other end of divider resistance, the negative pole of the second electrochemical capacitor and the 3rd electric capacity.
As a kind of embodiment, described wireless sending module comprises CSRBlueCore5-MM chip, and described wireless receiving module comprises CSRBlueCore5-ROM chip.
As a kind of embodiment, described audio frequency power amplifier module comprises PAM8403 stereo audio power amplifier, and the output signal of described wireless receiving module is connected with the left and right acoustic channels input pin of PAM8403 stereo audio power amplifier.
Novel radio audio frequency broadcast system of the present invention provides a kind of wireless audio transmission system, conveniently installs and uses, and because electric wire is few, simple in circuits is attractive in appearance, in addition, also has initialization fast, starts shooting soon and the advantage of stable performance.
Accompanying drawing explanation
Fig. 1 is the circuit structure module map of the novel radio audio frequency broadcast system of one embodiment of the invention.
Fig. 2 is the circuit theory diagrams of the booster circuit of power module in Fig. 1.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing, novel radio audio frequency broadcast system of the present invention is described in further detail.
As shown in Figure 1, in one preferred embodiment, novel radio audio frequency broadcast system 100 of the present invention mainly comprises power module, the main control chip be connected with power module, and store interface module, display module, audio-frequency module, load module and the reminding module to be connected with main control chip with power module, also comprise the wireless sending module be connected with audio-frequency module with power module, the wireless receiving module also comprising audio frequency power amplifier module and be connected with the audio input end of audio frequency power amplifier module.Wherein, the voice data that audio-frequency module exports sends to audio frequency power amplifier module amplify process and/or play by wireless sending module and wireless receiving module, and conveniently install and use, because electric wire is few, simple in circuits is attractive in appearance.
Especially, power module comprises the first separate power module and second source module.First power module is that main control chip, store interface module, display module, load module, audio-frequency module and wireless sending module are powered.In the first power module, be provided with the power circuit that output voltage is 12V, 5V, 3.3V and 1.8V respectively, for each circuit module and chips such as main control chips.Wherein output voltage be 12V power circuit can with 12V voltage stabilizer substitute, 12V electricity is converted to 5V, 3.3V and 1.8V by the first power module again.The voltage stabilizing chip used in first power circuit can include but not limited to LM2940, LM1117-3.3, LM1117-1.8.
Second source module is that audio frequency power amplifier module and wireless receiving module are powered.Second source module employs lithium battery, therefore has a lithium battery input interface, and the output voltage of this lithium battery is 3.7V, therefore, also arranges the booster circuit that 3.7V to be boosted to 5V by between lithium battery input interface and audio playing module.As shown in Figure 2, booster circuit mainly comprises switching regulator IC U1, the first electric capacity C1, the second electric capacity C5, the 3rd electric capacity C4, the first electrochemical capacitor C2, the second electrochemical capacitor C3, inductance L 1, diode D1 and adjustable resistance VR1.The cathode output end of lithium battery input interface Li is connected with one end of the input end Vin of switching regulator IC U1, the first electric capacity C1, the positive pole of the first electrochemical capacitor C2.The comp port of switching regulator IC U1 passes through the series arm ground connection of a resistance R1 and the second electric capacity C5 composition, and its end of convert Switch is connected with the anode of diode D1, and is connected with its input end Vin by inductance L 1.The negative pole of diode D1 as the output terminal VCC5 of booster circuit, and is connected with one end of the 3rd electric capacity C4 with one end of adjustable resistance VR1, the positive pole of the second electrochemical capacitor C3.The other end of adjustable resistance VR1 is connected with one end of the feedback end feed of switching regulator IC U1 and a divider resistance R2.The equal ground connection of the other end of the negative pole of the cathode output end of lithium battery input interface Li, the other end of the first electric capacity C1, the first electrochemical capacitor C2, the other end of divider resistance R2, the negative pole of the second electrochemical capacitor C3 and the 3rd electric capacity C4.In the present embodiment, switching regulator IC U1 have employed LM2577 voltage stabilizing chip, and high-power, the high-level efficiency of switching mode LM2577 boost chip meet the requirement of the larger output power of power amplifier module.
Main control chip adopts STM32 family chip, and it transmits voice data by spi bus to audio-frequency module, obtains data from store interface module.In this enforcement, have employed STM32F103ZET6 chip, audio-frequency module have employed VS1053 audio decoder chip.
Display module in the present embodiment have employed colored TFTLCD, built-in TFT controller, and the chip of look drive TFT liquid crystal panel adopts ILI9320 chip.ILI9320 liquid-crystal controller carries video memory, and the total size of its video memory is 172820(240*320*18/8), the video memory amount namely under 18 bit patterns (260,000 look).User, when operating Liquid Crystal Module, is actually control register, the display data memory of being correlated with to ILI9320 and operates.With vegetarian refreshments number for 320 × 240, color depth is 16 is example, on 2.8 inches of TFT-LCD display panels, be dispersed with 320 × 240 pixels altogether, and the TFT-LCD drived control built-in chip type of inside modules there is the display data RAM(corresponding with these pixels to be called for short video memory).In module, each pixel needs the data of 16 (i.e. 2 byte lengths) to represent the RGB colouring information of this point, so the built-in video memory of module has the space of 320 × 240 × 16bit, we describe its size with byte (byte) usually.
The display operation of display module is very easy, when needing the color changing some pixels, only needs to operate the video memory of 2 bytes corresponding to this point.And for the ease of index operation, all video memory addresses are divided into X-axis address (XAddress) and Y-axis address (YAddress) by module, can the scope of addressing be XAddress=0 ~ 239 respectively, YAddress=0 ~ 319, XAddress and YAddress intersection correspond to a video memory unit (2byte); As long as when having indexed some X, Y-axis address like this, and operate the register of this address, just can pixel corresponding on TFT-LCD display be operated.16 position datawires of module are 565 modes with the corresponding relation of aobvious cun.Minimum 5 represent blueness, and middle 6 is green, and the highest 5 is red.Numerical value is larger, represents that this color is darker.RGB ratio to be 5:6:5 be a very general color standard, inserts the coding of this color in the corresponding address of video memory, can export the pixel of this color by control LCD.Be encoded to 0x0000 as black, white be encoded to 0xffff, redness is 0xf800.
There is a video memory address accumulator AC display module inside, and namely for adding up automatically to video memory address when reading and writing video memory, this is very useful when operating display data on the screen continuously, especially for figure display, video display.In addition, AC totalizer can be set to the accumulate mode in various direction, as being to XAddress accumulate mode under normal circumstances, is specially when being added to the end of a line, can be switched to next line start add up; Can also be to YAddress accumulate mode, be specially when being added to the end of row (vertical direction), the row that can be switched to corresponding to next XAddress start to add up.
The communication interface time sequence of ILI9320 can use common I/O interface to simulate by STM32, but efficiency is lower like this, and STM32 provides a kind of special control method---use FSMC interface.Use in the design FSMC NOR PSRAM Schema control LCD, control NORFLASH mainly uses signal wire as shown in table 1:
The signal wire of table 1FSMC control NORFLASH
| FSMC signal name | Sense | Function |
| CLK | Export | Clock (use of synchronization burst pattern) |
| A[25：0] | Export | Address bus |
| D[15：0] | I/O | BDB Bi-directional Data Bus |
| NE[X] | Export | Sheet selects, x=1...4 |
| NOE | Export | Output enable |
| NWE | Export | Write enable |
| NWAIT | Input | NOR flash memory requires the signal that FSMC waits for |
ANTENN AUDIO Play System adopts SD card as storer, and it has the characteristic that power failure data is not lost.Flash memory is a kind of novel EEPROM internal memory, has internal memory erasable and can write programmable advantage, the advantage that the data also with write can not be lost after a loss of power, and flash card is the storer utilizing flash memory technology to reach storage of electronic information.Size is just as the SD memory card of a stamp, and weight only has 2 grams, but has high memory capacity, rapid data transmission rate, great mobile dirigibility and well security.
Owing to employing SPI pattern, therefore system obtains after starting and first allows SD card enter SPI pattern, and concrete initial method comprises step:
Step one, the SPI configuration parameter of initialization main control chip and I/O port configuration parameter;
Step 2, main control chip sends reset command CMD0 to store interface module, makes the SD card be connected with store interface module enter idle condition (IDLE state);
Step 3, main control chip sends CMD8 order to store interface module, checks whether SD card supports 2.0 agreements; Afterwards, main control chip also according to different protocol testing SD cards, such as, may send the orders such as CMD55, CMD41, CMD58 and CMD1 to SD card;
Step 4, main control chip sends at least 8 clock signals (CLK) to described store interface module.Wherein, at least 8 clock signals of step 4 kind are to provide the extra clock of SD card, complete in SD agreement and specifically operate, be not described in detail in this.
So, the initialization to SD card is completed.Especially, when SD card receives reset command (CMD0), CS pin be significant level (low level) then SPI pattern be activated, but before transmission CMD0, sending and be greater than 74 clocks, this is because there is the individual supply voltage rise time SD card inside, is probably 64 clock signals, it is synchronous that 10 remaining CLK are used for SD card, could start the operation of CMD0 afterwards.
By SD card initialization, we can know the type (V1, V2, V2HC or MMC) of SD card, after completing initialization, just can start to have read and write data.
Audio-frequency module have employed VS1053 audio decoder chip.The audio data stream that VS1053 is inputted by SPI interface, it can be a system from machine, also can as independently main frame.Here only it is treated as and use from machine.By SPI mouth to VS1053 ceaselessly input audio data, it will automatic decoding, then exports music from audio frequency power amplifier module passage, at this moment connects earphone or loudspeaker or audio amplifier and just can hear play audio frequency.
The transmission of ANTENN AUDIO uses Bluetooth audio frequency module, comprise bluetooth sending module and Bluetooth receptions module two parts, after voice data is sent to the decoding of VS1053 audio decoder chip by STM32, the sound signal exported sends through Bluetooth audio frequency transmitter module, and sound signal is play to power amplifier module after receiving sound signal by Bluetooth receptions module.Wireless sending module adopts CSRBC5 chip, versions V2.1+EDR, the high frequency matter music transmission of sighting distance 10 meters (without hindrance every) can be realized, stereo audio is converted to Bluetooth transmission signal and is sent to receiving unit by radiating portion, and this programme is simple and easy to use, efficient and acoustical quality is pretty good.Periphery does not need circuit, module has button and the LED display of control, only needs power supply just can work.In addition, this module has been arranged filters bluetooth equipment type, is only connected with bluetooth equipments such as having the blue-tooth stereo earphone of A2DP agreement and audio amplifier.When module does not match Bluetooth stereo equipment, module powers on automatic search connect satisfactory equipment, after connecting, module can remember the bluetooth device address code connected, break or re-power and all can certainly be dynamically connected, as needs disconnect or search equipment again, please by the button in module.Wireless receiving module adopts CSRBlueCore5-ROM chip, is suitable for the product such as Bluetooth audio device receiving unit, Bluetooth stereo audio receiver.Periphery does not need circuit, module has button and the LED display of control, only needs power supply both can work.
What audio frequency power amplifier module was selected is PAM8403 stereo audio power amplifier.PAM8403 can to provide the power of 3W higher than the efficiency of 85%.PAM8403 stereo audio power amplifier feature is: reactive filter amplifier, low quiescent current; Under 4 Ω loads and 5V Power Supplies Condition, provide the output power up to 3W; Efficiency is up to 90%; Short-circuit current is protected; Low noise, Thermal protection; Few external component, saves space cost.In audio frequency power amplifier module, the sound signal that Bluetooth receptions module receives is sent to the left and right acoustic channels input pin of PAM8403, exports the stereo of two-way after PAM8403 carries out power amplification in inside.
Load module is mainly button, for carrying out switching on and shutting down, operating up and down, to realize switching on and shutting down, select song, to control the operations such as volume.Reminding module comprises multiple LED light emitting diode, for realizing system prompt function.
After system starts, first carry out system initialization, in system initialization, LED port initialization, LCD initialization, Key pad port initialization, VS1053 initialization etc. can be carried out, after initialization, main control chip can read audio file data from SD card, then be transferred to VS1053 audio decoder chip, then is sent by bluetooth module and play.Main control chip constantly scans key-press module in master routine, and whether detect button and be pressed, press if any button, system then makes corresponding response.In the process that whole system is run, lcd screen display system information, song information, adjustment information etc.
The design take STM32F103ZET6 as main control chip, in conjunction with audio decoder chip VS1053, STM32F103ZET6 completes SD card digital independent, by spi bus, voice data is sent to VS1053 decoding chip, and the sound signal that VS1053 exports is delivered to Bluetooth transmission module and sent.After the Bluetooth receptions module at audio amplifier place receives sound signal, be transferred to power amplifier module play.In addition, Bluetooth receptions module can also be connected with the bluetooth of other audio frequency apparatus, carries out ANTENN AUDIO broadcasting.ANTENN AUDIO Play System based on STM32 can make wireless penetration between audio frequency apparatus, eliminate the trouble of arranging cable, substantially increase the dirigibility of audio frequency apparatus and increase the serviceable life of equipment, and wireless sound box also meets the thought of Modern Family's Smart Home.
Native system hardware design adopts modularized design scheme, is made up of system microcontroller, power module, SD card module, LCD display module, audio decoder module, bluetooth sending module, Bluetooth receptions module, audio frequency power amplifier module etc.Software also uses corresponding modular design, makes whole software frame more succinctly clear.Owing to adopting wireless audio frequency transmission function mode, conveniently install and use, because electric wire is few, simple in circuits is attractive in appearance, in addition, also has initialization fast, starts shooting soon and the advantage of stable performance, has application and promotional value preferably.
Although the description of this invention carries out in conjunction with above specific embodiment, those skilled in the art can carry out many replacements, modifications and variations, be apparent according to above-mentioned content.Therefore, all like this substitute, improve and change be all included in the spirit and scope of attached claim.
Claims (9)
1. the initial method of a novel radio audio frequency broadcast system, described novel radio audio frequency broadcast system comprises power module and the main control chip that is connected with power module and the store interface module be connected with main control chip with power module, display module, load module and audio-frequency module, it is characterized in that, described novel radio audio frequency broadcast system also comprises audio frequency power amplifier module and the wireless sending module that is connected with the output terminal of described audio-frequency module and the wireless receiving module be connected with the audio input end of described audio frequency power amplifier module, described power module comprises the first separate power module and second source module, first power module is described main control chip, store interface module, display module, load module, audio-frequency module and wireless sending module are powered, described second source module is that described audio frequency power amplifier module and wireless receiving module are powered, described main control chip is connected with store interface module and audio-frequency module by spi bus, described store interface module is SD card interface, described initial method comprises:
Step one, the SPI configuration parameter of initialization main control chip and I/O port configuration parameter;
Step 2, main control chip sends reset command to described store interface module, makes the SD card be connected with store interface module enter idle condition;
Step 3, main control chip sends CMD8 order to described store interface module, checks whether described SD card supports 2.0 agreements;
Step 4, main control chip sends at least 8 clock signals to described store interface module.
2. the initial method of novel radio audio frequency broadcast system according to claim 1, is characterized in that, before execution step 2, described main control chip sends at least 64 clock signals to described store interface module.
3. the initial method of novel radio audio frequency broadcast system according to claim 2, it is characterized in that, described main control chip sends 10 for synchronous clock signal to store interface module again after described store interface module sends at least 64 clock signals.
4. the initial method of the novel radio audio frequency broadcast system according to any one of claims 1 to 3 item, is characterized in that, the frequency of described clock signal is less than or equal to 400Khz.
5. a novel radio audio frequency broadcast system, it comprises power module and the main control chip that is connected with power module and the store interface module be connected with main control chip with power module, display module, load module and audio-frequency module, it is characterized in that, described novel radio audio frequency broadcast system also comprises audio frequency power amplifier module and the wireless sending module that is connected with the output terminal of described audio-frequency module and the wireless receiving module be connected with the audio input end of described audio frequency power amplifier module, described power module comprises the first separate power module and second source module, first power module is described main control chip, store interface module, display module, load module, audio-frequency module and wireless sending module are powered, described second source module is that described audio frequency power amplifier module and wireless receiving module are powered, described main control chip is connected with store interface module and audio-frequency module by spi bus, described store interface module is SD card interface.
6. novel radio audio frequency broadcast system according to claim 5, is characterized in that, the booster circuit that described second source module comprises lithium battery input interface and is connected between lithium battery input interface and audio playing module.
7. novel radio audio frequency broadcast system according to claim 6, it is characterized in that, described booster circuit comprises switching regulator IC, the first electric capacity, the second electric capacity, the 3rd electric capacity, the first electrochemical capacitor, the second electrochemical capacitor, inductance, diode and adjustable resistance; The cathode output end of lithium battery input interface is connected with one end of the input end of switching regulator IC, the first electric capacity, the positive pole of the first electrochemical capacitor; The cmp port of switching regulator IC passes through the series arm ground connection of a resistance and the second electric capacity composition, and its end of convert is connected with the anode of diode, and is connected with its input end by inductance; The negative pole of diode as the output terminal of described booster circuit, and is connected with one end of the 3rd electric capacity with one end of adjustable resistance, the positive pole of the second electrochemical capacitor; The other end of adjustable resistance is connected with one end of the feedback end of switching regulator IC and a divider resistance; The equal ground connection of the other end of the negative pole of the cathode output end of lithium battery input interface, the other end of the first electric capacity, the first electrochemical capacitor, the other end of divider resistance, the negative pole of the second electrochemical capacitor and the 3rd electric capacity.
8. novel radio audio frequency broadcast system according to claim 6, is characterized in that, described wireless sending module comprises CSRBlueCore5-MM chip, and described wireless receiving module comprises CSRBlueCore5-ROM chip.
9. novel radio audio frequency broadcast system according to claim 8, it is characterized in that, described audio frequency power amplifier module comprises PAM8403 stereo audio power amplifier, and the output signal of described wireless receiving module is connected with the left and right acoustic channels input pin of PAM8403 stereo audio power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510704660.2A CN105355223A (en) | 2015-10-27 | 2015-10-27 | Novel wireless audio playback system and initialization method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510704660.2A CN105355223A (en) | 2015-10-27 | 2015-10-27 | Novel wireless audio playback system and initialization method therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105355223A true CN105355223A (en) | 2016-02-24 |
Family
ID=55331180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510704660.2A Withdrawn CN105355223A (en) | 2015-10-27 | 2015-10-27 | Novel wireless audio playback system and initialization method therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105355223A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686486A (en) * | 2017-01-09 | 2017-05-17 | 厦门神州鹰软件科技有限公司 | Wireless radio frequency Bluetooth speaker |
| CN107102818A (en) * | 2017-03-16 | 2017-08-29 | 山东大学 | A kind of high-speed data processing method based on SD card |
| CN110581647A (en) * | 2019-09-29 | 2019-12-17 | 北京机械设备研究所 | Signal source circuit based on charger and battery power supply and power supply method |
| CN111414125A (en) * | 2018-12-18 | 2020-07-14 | 华为技术有限公司 | Operation method of storage device and storage device |
-
2015
- 2015-10-27 CN CN201510704660.2A patent/CN105355223A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106686486A (en) * | 2017-01-09 | 2017-05-17 | 厦门神州鹰软件科技有限公司 | Wireless radio frequency Bluetooth speaker |
| CN107102818A (en) * | 2017-03-16 | 2017-08-29 | 山东大学 | A kind of high-speed data processing method based on SD card |
| CN111414125A (en) * | 2018-12-18 | 2020-07-14 | 华为技术有限公司 | Operation method of storage device and storage device |
| CN110581647A (en) * | 2019-09-29 | 2019-12-17 | 北京机械设备研究所 | Signal source circuit based on charger and battery power supply and power supply method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105243988A (en) | Embedded LED display controller | |
| CN105355223A (en) | Novel wireless audio playback system and initialization method therefor | |
| CN101119123A (en) | Electronic equipments with accessory identifying function and identifying method thereof | |
| CN102289257A (en) | Main board interface circuit of police identity recognizer | |
| CN102780866A (en) | Modularized television | |
| CN204392569U (en) | Based on the open wireless microphone of bluetooth earphone source of sound | |
| CN204287813U (en) | Multifunctional interface circuit and development board | |
| CN205140516U (en) | Novel wireless audio playback system | |
| CN211294586U (en) | Synchronous and asynchronous player | |
| CN107894883A (en) | Audio stream transmission method and sound card audio conversion circuit | |
| CN103697354A (en) | LED (light emitting diode) illumination device and stereophonic sound Bluetooth sound box system | |
| CN204101917U (en) | A kind of multiplex roles audio base and its internal circuit | |
| CN204009438U (en) | A kind of intelligent wireless touch control panel with phonetic function | |
| CN203243502U (en) | Mobile power supply portable sound equipment | |
| CN205881462U (en) | Intelligent vehicle-mounted audio player | |
| CN208126185U (en) | A kind of industrial intelligent controlling terminal | |
| CN207663436U (en) | Sound card audio conversion circuit and data transmission set | |
| CN207783117U (en) | A kind of air purifier voice cue module | |
| CN201610005U (en) | Wireless network television radio pen | |
| CN210629607U (en) | Smartphone function expansion equipment based on raspberry group | |
| CN104102152A (en) | Wireless intelligent touch control panel with speech function | |
| CN205247835U (en) | LED picture and text screen | |
| CN216486241U (en) | Raspberry pie expansion board | |
| CN211319323U (en) | Control device for self-lifting cabinet and self-lifting cabinet | |
| CN203773943U (en) | Portable multi-functional Bluetooth-enabled speaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20160224 |
|
| WW01 | Invention patent application withdrawn after publication |