CN202222044U - Multimedia broadcast automobile sound system - Google Patents
Multimedia broadcast automobile sound system Download PDFInfo
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- CN202222044U CN202222044U CN2011203588657U CN201120358865U CN202222044U CN 202222044 U CN202222044 U CN 202222044U CN 2011203588657 U CN2011203588657 U CN 2011203588657U CN 201120358865 U CN201120358865 U CN 201120358865U CN 202222044 U CN202222044 U CN 202222044U
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Abstract
The utility model discloses a multimedia broadcast automobile sound system comprising an audio circuit, a power supply module, a reception module having a data broadcast reception function, a control unit used for controlling the each circuit and demodulating the data broadcast, and a display module used for displaying play information and displaying data broadcast information; wherein the audio circuit, the reception module and the display module are connected with the control unit; and the power supply module is connected with the each circuit through the control unit. The multimedia broadcast automobile sound system of the utility model can receive data transmitted by a data broadcast system, and not only can display related information of a broadcast program, such as a radio station name, program contents, and so on, but also can timely receive information such as emergency information, road traffic information and so on, thereby greatly enhancing the function of the present FM (Frequency Modulation), enhancing entertainment and practicality of the automobile sound system, and playing an active role in pushing forward construction of the data broadcast system in our country.
Description
Technical field
The utility model relates to the automobile audio of a kind of automobile audio, particularly a kind of multimedia broadcasting.
Background technology
At present; Along with the function of automobile audio in continuous increase; Product is in innovation constantly; Its amusement performance is in continuous enhancing, but FM broadcasting is occupying very consequence always in automobile entertainment, no matter is to have embedded FM radio reception part mostly at automobile audio or in such as MP3, smart mobile phone, PDA product; Particularly in driving procedure; FM FM broadcasting function of radio receiver is used by the driver and conductor especially continually; FM broadcasting radio reception equipment is not only easy to use, wide coverage, and travelling performance is high; And real-time broadcast listening and possess well recreationally, be indispensable part in the automobile equipment all the time.
Made up the automobile audio of FM function of radio receiver; Can not only play the music that carries through playback equipment, and can let the user use automobile audio to play the FM station broadcast easily, enrich the amusement performance of automobile audio; But the FM broadcast capability is too simple; Often can only can only guess the in progress program in radio station from the content of being heard in use, thereby select to have spent the very big time on the channel that oneself needs according to the channel selection radio station of being transferred.
Radio Data System is a new and high technology that appeared at the radio broadcasting field in recent years.It utilizes existing frequency modulation equipment to be loaded into the excessive data of some non-voice datas on the additional channel of FM multiplex channel after with ovennodulation, is embodied in the traffic information broadcasting, so especially; On the basis of these data that increase more; Radio Data System has just had the ability of deal with data, literal, symbol and information, can be used for traffic information broadcasting, RP Radio Paging, background music, but the large tracts of land networking; Distinguishing features such as reliability height; Scheme based on Radio Data System will demonstrate increasing technological merit, because Radio Data System is simple, data broadcasting will progressively be applied.
Because Radio Data System is to utilize the subcarrier in the FM multiplex that the data message service is provided in transmitting audio signal; And existing FM radio reception equipment does not receive the ability of data broadcasting; Therefore when using FM radio reception equipment, receive data broadcasting signal simultaneously if will use; Must upgrade to existing radio reception equipment; And can not accept the hoot device that data broadcasting signal also utilizes at present on the market, and causing the slower development of Radio Data System, social level of application is not high.
The utility model content
For addressing the above problem, promote the continuous development of Radio Data System, the purpose of the utility model is to provide a kind of can receive data broadcasting signal and to its a kind of multimedia broadcasting automobile audio of using.
The utility model solves the technical scheme that its problem adopted:
A kind of multimedia broadcasting automobile audio; Comprise the voicefrequency circuit that is used for output audio, give the power module of each circuit supply, also comprise radio reception module, be used to control each circuit and demodulation is carried out in broadcasting to data control unit, be used to the display module of information of displaying the play and video data broadcast message with data broadcasting receiving function; Said voicefrequency circuit, radio reception module, display module link to each other with control unit, and power module links to each other with each circuit through control unit.
Further, said radio reception module adopts the TDA7703R radio reception chip with radio reception and data broadcasting receiving function.The advanced digital Low Medium Frequency framework of TDA7703R radio reception built-in chip type DSP; Need not artificial adjustment; Just can realize that all AM/FM that are input to audio frequency output from antenna accept function, this chip not only volume is little, light weight; And support multiple Serial Control mode, so be specially adapted in the utility model vehicle audio and other the small-sized portable equipments; TDA7703R radio reception chip can be realized AM, FM, mute function, calibrate frequency-shift keying, the stereo processing of FM automatically; The output of confession analog and digital voice.TDA7703R radio reception chip can receive data broadcasting signal, makes the utility model multimedia broadcasting automobile audio can report various message and news automatically; It possesses advanced automatic channel search algorithm, and fully integrated global tuned frequency also possesses the fast data broadcast system and the efficient phase-locked loop circuit established.
Further, described control unit adopts the RF8806 control chip with control and data broadcasting demodulation function.The data broadcasting signal that the RF8806 control chip can receive the radio reception module well carries out demodulation and processing, makes the multimedia broadcasting automobile audio of the utility model handle and to use this signal.
Preferably, No. 30 RSTN pins of TDA7703R chip link to each other through No. 28 pin PLL_CE of TU_RST interface and RF8806, the operation that control unit possibly resetted to the radio reception module through this pin; No. 29 RDSINT pins of TDA7703R link to each other through No. 28 pin PLL_CE of TU_INT interface and RF8806; No. 27 SCL pins of TDA7703R link to each other through No. 26 pin PLL_CLK/STIN of TU_SCL interface and RF8806; No. 26 SDA pins of TDA7703R link to each other through No. 27 pin PLL_DATA of TU_SDA interface and RF8806; This connected mode can communicate control unit and radio reception module through the mode of universal serial bus; The digital broadcast data that the radio reception module is received is connected through this with control information delivers to control centre; Factor comprises 16 group codings according to broadcast message; Comprise whether station name information, program of radio station type information, traffic radio indication information, radio station are playing the indication information of traffic message, the tranmitting frequency table in radio station, SIC station identification code, RTA Radio Text display message, time adjustment information, control centre carries out decoding and reconstituting to its data and extracts corresponding data broadcasting information and this information is shown or controls.
Preferably, the VCC-DAC pin of said TDA7703R chip, VDD-1V2 pin, GND-1V2 pin all are connected with the 78M05 voltage stabilizing circuit, think that its pin provides suitable stable voltage.
Preferably, the DACOUTR pin of said TDA7703R chip is in series with the electric capacity of 224u and the resistance of 3.3k is connected to radio reception module audio output interface TUN-R; The DACOUTL pin of TDA7703 chip is in series with the electric capacity of 224u and the resistance of 3.3k is connected to radio reception module audio output interface TUN-L, and TUN-R and TUN-L are connected to the audio input end of voicefrequency circuit.
Further, also comprise the audio decoder module, the audio decoder module comprises audio decoding unit, memory cell interface; Said audio decoding unit links to each other with control unit, and control unit reads the data of external memory device the inside through audio decoding unit and memory cell interface.The audio decoder module can be decoded to audio file, and control unit reads the data of memory device the inside through control audio decoding unit reading cells interface and decodes, and decoded transfer of data is exported to voicefrequency circuit.
Preferably, said audio decoding unit adopts the MP3/WMA decoding chip of the TMD55D of NEC Corporation.This chip has good decoding function; Can decode and further process audio files such as MP3/WMA; The better adaptability of this chip in the utility model; Can not only reduce the number of peripheral circuit element, reduce production cost, and can improve the performance of this practical new product aspect audio entertain mem.
Further, said memory cell interface comprises SD card that is complementary with the SD card and/or the USB interface that is complementary with circumscribed USB storage equipment.Adopt the SD card of the external SD card of ability and/or the USB interface of circumscribed USB storage equipment, can make things convenient for the user to change memory device, strengthen the ability of multimedia broadcasting automobile audio displaying audio file.
Further, said voicefrequency circuit comprises audio frequency processing circuit, power amplifier that is used to amplify that is used for audio signal and the loud speaker that is used for output sound; Control unit is through audio frequency processing circuit, power amplifier, loud speaker output sound.Control unit is delivered to audio frequency processing circuit with voice data and it is carried out audio frequency simulation is delivered to power amplifier after the processing such as digital-to-analogue conversion, noise reduction, volume adjustment and amplify, and outputs to loud speaker at last.
Further, said power module comprises the voltage stabilizing circuit that links to each other with automobile power source, the electric power management circuit that is used for managing electrical power, and said electric power management circuit links to each other with control unit with voltage stabilizing circuit.Electric power management circuit and voltage stabilizing circuit can play the effect of stablizing vehicle power supply voltage, guarantee that each circuit of multimedia broadcasting automobile audio is in after the stable operating voltage, have guaranteed the normal operation of the utility model.
Further, said display module comprises display screen and the display driver circuit that is used to drive display screen, and said display driver circuit links to each other with control unit through the releasable connection interface.The display module of the utility model can not only the display the play fileinfo of audio frequency and/or the channel of radio reception, and information that can the video data broadcast singal further improve the application of the utility model to the data broadcast singal; The releasable connection interface can make things convenient for the user to change different devices, has made things convenient for maintenance and expanded application.
Further, control unit is connected with LED light control module and/or key-press module through the releasable connection mouth.LED light control module and key-press module can make things convenient for the operation of user to the multimedia broadcasting automobile audio, strengthen the practicality of the utility model.
The beneficial effect of the utility model is: a kind of multimedia broadcasting automobile audio that the utility model adopts; Comprise the voicefrequency circuit that is used for output audio, give the power module of each circuit supply, also comprise radio reception module, be used to control each circuit and demodulation is carried out in broadcasting to data control unit, be used to the display module of information of displaying the play and video data broadcast message with data broadcasting receiving function; Said voicefrequency circuit, radio reception module, display module link to each other with control unit, and power module links to each other with each circuit through control unit.The multimedia broadcasting automobile audio of the utility model receives the data that the data broadcast system sends through the radio reception module that it has the data broadcasting receiving function, and the data after the reception are delivered to control unit and handled and realize following function:
When the user is driving in the way displaying audio file or is listening to certain radio station; If local Radio Data System is inserted relevant for the important hints information of local transit, the data broadcasting radio station can be sent a traffic message and inserted signal, after the radio reception module receives signal; This signal is reached the control power supply; Control unit can suspend plays the current audio file or the broadcast in radio station, thereby plays important traffic message, makes the user when driving, can in time receive transport information; Let the user change route according to traffic message early, convenient trip.
All there is a program category attribute in each data broadcasting radio station; When the user when receiving the data broadcasting radio station; Control centre's control display driver circuit shows current program category on display screen; The user can be according to the type of selecting to let main control unit control radio reception block search wherein like liked of oneself, thereby improves the efficient of user search institute favorite channel.
The data broadcasting radio station generally can corresponding a plurality of tranmitting frequencies realize that the zone covers; For realizing the switching of radio reception module in these frequencies; Radio Data System can be sent an AF table to the radio reception module, and when automobile was gone to another area from an area, control unit can receive AF table conversion different frequency channels according to the radio reception module; Thereby keep radio reception clear, guarantee the radio reception quality.
The data broadcasting that send in the data broadcasting radio station comprises inventory and/or its related content of its broadcast program; When the user when listening to this program of radio station, control unit is delivered to display module with the data after handling and is shown through handling the data of radio reception module transmission; The content that lets the user needn't carefully listen to the radio station could be judged the program of being listened to; As long as just can know the program of listening to through display module, improve the efficient of user search program widely, strengthened the function of FM radio reception.
A kind of multimedia broadcasting automobile audio of the utility model has increased the recreational and practicality of FM radio reception widely, and the utility model is that Radio Data System provides a kind of good received vector, promotes the development of Radio Data System and technology thereof.
Description of drawings
Below in conjunction with accompanying drawing and instance the utility model is described further.
Fig. 1 is the system principle diagram of the utility model multimedia broadcasting automobile audio.
Fig. 2 is the radio reception module circuit diagram of the utility model multimedia broadcasting automobile audio.
Fig. 3 is the control unit circuit figure of the utility model multimedia broadcasting automobile audio.
Embodiment
With reference to Fig. 1-Fig. 3; A kind of multimedia broadcasting automobile audio of the utility model; Comprise the voicefrequency circuit 1 that is used for output audio, give the power module 2 of each circuit supply, also comprise radio reception module 3, be used to control each circuit and demodulation is carried out in broadcasting to data control unit 4, be used to the display module 5 of information of displaying the play and video data broadcast message with data broadcasting receiving function; Said voicefrequency circuit 1, radio reception module 3, display module 5 link to each other with control unit 4, and power module 2 links to each other with each circuit through control unit 4.The multimedia broadcasting automobile audio of the utility model receives through the data that its 3 pairs of data broadcast systems of radio reception module with data broadcasting receiving function send; Data after the reception are delivered to control unit 4 and are handled and realize following function: when the user is driving in the way displaying audio file or listening to certain radio station; If local Radio Data System is inserted relevant for the important hints information of local transit, the data broadcasting radio station can be sent a traffic message and inserted signal, after radio reception module 3 receives signal; This signal is reached the control power supply; Control unit 4 can suspend plays the current audio file or the broadcast in radio station, thereby plays important traffic message, makes the user when driving, can in time receive transport information; Let the user change route according to traffic message early, convenient trip; All there is a program category attribute in each data broadcasting radio station; When the user when receiving the data broadcasting radio station; Control centre control display driver circuit 52 shows current program category on display screen 51, the user can select to let main control unit control radio reception module 3 according to own liking and search for the type of wherein liking; Thereby improve the efficient of user search institute favorite channel; The data broadcasting radio station generally can corresponding a plurality of tranmitting frequencies realize that the zone covers; For realizing the switching of radio reception module 3 in these frequencies; Radio Data System can be sent an AF table to radio reception module 3, and when automobile was gone to another area from an area, control unit 4 can receive AF table conversion different frequency channels according to radio reception module 3; Thereby keep radio reception clear, guarantee the radio reception quality; The data broadcasting that send in the data broadcasting radio station comprises inventory and/or its related content of its broadcast program; When the user when listening to this program of radio station; Control unit 4 is through handling the data of radio reception module 3 transmission; Data after handling are delivered to display module 5 show that the content that lets the user needn't carefully listen to the radio station could be judged the program of being listened to, as long as just can know the program of listening to through display module 5; Improve the efficient of user search program widely, strengthened the function of FM radio reception.
Further, said radio reception module 3 adopts the TDA7703R radio reception chip with radio reception and data broadcasting receiving function.The advanced digital Low Medium Frequency framework of TDA7703R radio reception built-in chip type DSP; Need not artificial adjustment; Just can realize that all AM/FM that are input to audio frequency output from antenna accept function, this chip not only volume is little, light weight; And support multiple Serial Control mode, so be specially adapted in the utility model vehicle audio and other the small-sized portable equipments; TDA7703R radio reception chip can be realized AM, FM, mute function, calibrate frequency-shift keying, the stereo processing of FM automatically; The output of confession analog and digital voice.TDA7703R radio reception chip can receive data broadcasting signal, makes the utility model multimedia broadcasting automobile audio can report various message and news automatically; It possesses advanced automatic channel search algorithm, and fully integrated global tuned frequency also possesses the fast data broadcast system and the efficient phase-locked loop circuit established.
Further, described control unit 4 adopts the RF8806 control chip with control and data broadcasting demodulation function.The data broadcasting signal that the RF8806 control chip can receive radio reception module 3 well carries out demodulation and processing, makes the multimedia automobile audio of the utility model handle and to use this signal.
Preferably, No. 30 RSTN pins of TDA7703R chip link to each other through No. 28 pin PLL_CE of TU_RST interface and RF8806, the operation that control unit 4 possibly resetted to radio reception module 3 through this pin; No. 29 RDSINT pins of TDA7703R link to each other through No. 28 pin PLL_CE of TU_INT interface and RF8806; No. 27 SCL pins of TDA7703R link to each other through No. 26 pin PLL_CLK/STIN of TU_SCL interface and RF8806; No. 26 SDA pins of TDA7703R link to each other through No. 27 pin PLL_DATA of TU_SDA interface and RF8806; This connected mode can communicate control unit 4 and radio reception module 3 through the mode of universal serial bus; The digital broadcast data that radio reception module 3 is received is connected through this with control information delivers to control centre; Factor comprises 16 group codings according to broadcast message; Comprise whether station name information, program of radio station type information, traffic radio indication information, radio station are playing the indication information of traffic message, the tranmitting frequency table in radio station, SIC station identification code, RTA Radio Text display message, time adjustment information, control centre carries out decoding and reconstituting to its data and extracts corresponding data broadcasting information and this information is shown or controls.
Preferably, the VCC-DAC pin of said TDA7703R chip, VDD-1V2 pin, GND-1V2 pin all are connected with 78M05 voltage stabilizing circuit 21, think that its pin provides suitable stable voltage.
Preferably, the DACOUTR pin of said TDA7703R chip is in series with the electric capacity of 224u and the resistance of 3.3k is connected to radio reception module 3 audio output interface TUN-R; The DACOUTL pin of TDA7703R chip is in series with the electric capacity of 224u and the resistance of 3.3k is connected to radio reception module 3 audio output interface TUN-L, and TUN-R and TUN-L are connected to the audio input end of voicefrequency circuit 1.
Further, also comprise audio decoder module 6, audio decoder module 6 comprises audio decoding unit 61, memory cell interface 62; Said audio decoding unit 61 links to each other with control unit 4, and control unit 4 reads the data of external memory device the inside through audio decoding unit 61 and memory cell interface 62.Audio decoder module 6 can be decoded to audio file, and control unit 4 reads the data of memory device the inside through control audio decoding unit 61 reading cells interfaces 62 and decodes, and exports to voicefrequency circuit 1 decoded transfer of data.
Preferably, said audio decoding unit 61 adopts the MP3/WMA decoding chip of the TMD55D of NEC Corporation.This chip has good decoding function; Can decode and further process audio files such as MP3/WMA; The better adaptability of this chip in the utility model; Can not only reduce the number of peripheral circuit element, reduce production cost, and can improve the performance of this practical new product aspect audio entertain mem.
Further, said memory cell interface 62 comprises SD card 621 that is complementary with the SD card and/or the USB interface 622 that is complementary with circumscribed USB storage equipment.Adopt the SD card 621 of the external SD card of ability and/or the USB interface 622 of circumscribed USB storage equipment, can make things convenient for the user to change memory device, strengthen the ability of multimedia broadcasting automobile audio displaying audio file.
Further, said voicefrequency circuit 1 comprises the audio frequency processing circuit 11 that is used for audio signal, the power amplifier 12 that is used to amplify and the loud speaker 13 that is used for output sound; Control unit 4 is through audio frequency processing circuit 11, power amplifier 12, loud speaker 13 output sounds.Control unit 4 is delivered to audio frequency processing circuit 11 with voice data and it is carried out audio frequency simulation is delivered to power amplifier 12 after the processing such as digital-to-analogue conversion, noise reduction, volume adjustment and amplify, and outputs to loud speaker 13 at last.
Further, said power module 2 comprises the voltage stabilizing circuit 21 that links to each other with automobile power source, the electric power management circuit 22 that is used for managing electrical power, and said electric power management circuit 22 links to each other with control unit 4 with voltage stabilizing circuit 21.Electric power management circuit 22 can play the effect of stablizing vehicle power supply voltage with voltage stabilizing circuit 21, guarantees that each circuit of multimedia broadcasting automobile audio is in after the stable operating voltage, has guaranteed the normal operation of the utility model.
Further, said display module 5 comprises display screen 51 and the display driver circuit 52 that is used to drive display screen 51, and said display driver circuit 52 links to each other with control unit 4 through releasable connection interface 53.The display module 5 of the utility model can not only the display the play fileinfo of audio frequency and/or the channel of radio reception, and information that can the video data broadcast singal further improve the application of the utility model to the data broadcast singal; Releasable connection interface 53 can make things convenient for the user to change different devices, has made things convenient for maintenance and expanded application.
Further, control unit 4 is connected with LED light control module 7 and/or key-press module 8 through releasable connection interface 53.LED light control module 7 can make things convenient for the operation of user to the multimedia broadcasting automobile audio with key-press module 8, strengthens the practicality of the utility model.
The above, the just preferred embodiment of the utility model, the utility model is not limited to above-mentioned execution mode, as long as it reaches the technique effect of the utility model with identical means, all should belong to the protection range of the utility model.
Claims (9)
1. multimedia broadcasting automobile audio; Comprise the voicefrequency circuit (1) that is used for output audio, give the power module (2) of each circuit supply, it is characterized in that: also comprise radio reception module (3), be used to control each circuit and demodulation is carried out in broadcasting to data control unit (4), be used to the display module (5) of information of displaying the play and video data broadcast message with data broadcasting receiving function; Said voicefrequency circuit (1), radio reception module (3), display module (5) link to each other with control unit (4), and power module (2) links to each other with each circuit through control unit (4).
2. a kind of multimedia broadcasting automobile audio according to claim 1 is characterized in that: said radio reception module (3) adopts the TDA7703R radio reception chip with radio reception and data broadcasting receiving function.
3. a kind of multimedia broadcasting automobile audio according to claim 1 and 2 is characterized in that: described control unit (4) adopts the RF8806 control chip with control and data broadcasting demodulation function.
4. a kind of multimedia broadcasting automobile audio according to claim 1 is characterized in that: also comprise audio decoder module (6), audio decoder module (6) comprises audio decoding unit (61), memory cell interface (62); Said audio decoding unit (61) links to each other with control unit (4), and control unit (4) reads the data of external memory device the inside through audio decoding unit (61) and memory cell interface (62).
5. a kind of multimedia broadcasting automobile audio according to claim 4 is characterized in that: said memory cell interface (62) comprises SD card (621) that is complementary with the SD card and/or the USB interface (622) that is complementary with circumscribed USB storage equipment.
6. a kind of multimedia broadcasting automobile audio according to claim 1 is characterized in that: said voicefrequency circuit (1) comprises the audio frequency processing circuit (11) that is used for audio signal, the power amplifier (12) that is used to amplify and the loud speaker (13) that is used for output sound; Control unit (4) is through audio frequency processing circuit (11), power amplifier (12), loud speaker (13) output sound.
7. a kind of multimedia broadcasting automobile audio according to claim 1; It is characterized in that: said power module (2) comprises the voltage stabilizing circuit (21) that links to each other with automobile power source, the electric power management circuit (22) that is used for managing electrical power, and said electric power management circuit (22) links to each other with control unit (4) with voltage stabilizing circuit (21).
8. a kind of multimedia broadcasting automobile audio according to claim 1; It is characterized in that: said display module (5) comprises display screen (51) and is used to drive the display driver circuit (52) of display screen (51) that said display driver circuit (52) links to each other with control unit (4) through releasable connection interface (53).
9. a kind of multimedia broadcasting automobile audio according to claim 1 is characterized in that: control unit (4) is connected with LED light control module (7) and/or key-press module (8) through releasable connection interface (53).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203588657U CN202222044U (en) | 2011-09-23 | 2011-09-23 | Multimedia broadcast automobile sound system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203588657U CN202222044U (en) | 2011-09-23 | 2011-09-23 | Multimedia broadcast automobile sound system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202222044U true CN202222044U (en) | 2012-05-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203588657U Expired - Fee Related CN202222044U (en) | 2011-09-23 | 2011-09-23 | Multimedia broadcast automobile sound system |
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| Country | Link |
|---|---|
| CN (1) | CN202222044U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355613A (en) * | 2011-09-23 | 2012-02-15 | 江门市奥威斯电子有限公司 | Multimedia broadcast car audio |
| CN102779538A (en) * | 2012-07-04 | 2012-11-14 | 唐山轨道客车有限责任公司 | Multimedia playing system in train and train |
| CN105282657A (en) * | 2015-09-29 | 2016-01-27 | 奇瑞汽车股份有限公司 | Car audio equipment integration system |
-
2011
- 2011-09-23 CN CN2011203588657U patent/CN202222044U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355613A (en) * | 2011-09-23 | 2012-02-15 | 江门市奥威斯电子有限公司 | Multimedia broadcast car audio |
| CN102779538A (en) * | 2012-07-04 | 2012-11-14 | 唐山轨道客车有限责任公司 | Multimedia playing system in train and train |
| CN102779538B (en) * | 2012-07-04 | 2015-04-22 | 唐山轨道客车有限责任公司 | Multimedia playing system in train and train |
| CN105282657A (en) * | 2015-09-29 | 2016-01-27 | 奇瑞汽车股份有限公司 | Car audio equipment integration system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20120516 Termination date: 20140923 |
|
| EXPY | Termination of patent right or utility model |