CN101594495A - On-board multimedia device and portable multimedia device - Google Patents
On-board multimedia device and portable multimedia device Download PDFInfo
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- CN101594495A CN101594495A CNA2009100507053A CN200910050705A CN101594495A CN 101594495 A CN101594495 A CN 101594495A CN A2009100507053 A CNA2009100507053 A CN A2009100507053A CN 200910050705 A CN200910050705 A CN 200910050705A CN 101594495 A CN101594495 A CN 101594495A
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Abstract
A kind of on-board multimedia device and portable multimedia device.Described on-board multimedia device comprises: receiving element, link to each other with car antenna, and the Digital Television radiofrequency signal that the demodulation car antenna obtains is exported the sound, the video data stream that comprise in the described Digital Television radiofrequency signal; Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal; Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.Described on-board multimedia device and portable multimedia device can obtain digital television program in real time, have strengthened the audiovisual experience function.
Description
Technical field
The present invention relates to the multimedia application field, particularly on-board multimedia device and portable multimedia device.
Background technology
At present, most on-board multimedia device only limits to the audio/video file of storage in the play multimedia media (as CD or tapes such as CD, VCD, DVD), because the audio/video file of storing in the multimedia media generally can not upgrade, even can upgrade, this renewal process is also too loaded down with trivial details, therefore, and when needs obtain more seeing and hearing enjoyment by on-board multimedia device, need to buy more multimedia media, increased cost greatly.
More existing on-board multimedia devices can be play the audio/video file of storing in the USB device by USB interface, because between on-board multimedia device and the USB device is the physics wired connection, thereby use the audio/video file of USB device storage to carry out audio-visual broadcast also to have inconvenience.
And, though existing most of vehicle all has vehicle-mounted radio, can listen to the station broadcast program, also fail to realize the function of obtaining video information in real time and playing.
Therefore, how can obtain sound, video information in real time and play,, become a developing direction of present on-board multimedia device so that complete audiovisual experience to be provided.
Summary of the invention
The present invention solve prior art can not be more convenient the ground problem obtaining sound, video information in real time and play.
For addressing the above problem, the invention provides a kind of on-board multimedia device, comprising:
Receiving element links to each other with car antenna, the Digital Television radiofrequency signal that the demodulation car antenna obtains,
Export the sound, the video data stream that comprise in the described Digital Television radiofrequency signal;
Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal;
Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.
The present invention also provides a kind of portable multimedia device, comprising:
Antenna;
Receiving element links to each other with antenna, and the Digital Television radiofrequency signal that the demodulation antenna obtains is exported the sound, the video data stream that comprise in the described Digital Television radiofrequency signal;
Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal;
Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.
Compared with prior art, above-mentioned on-board multimedia device and portable multimedia device have the following advantages: by car antenna or self antenna, and radiofrequency signal that can receiving digital television, and play on broadcast unit by processing unit decoding back.This on-board multimedia device and portable multimedia device thereby can obtain digital television program have in real time strengthened the audiovisual experience function.
Description of drawings
Fig. 1 is a kind of execution mode schematic diagram of on-board multimedia device of the present invention;
Fig. 2 is a kind of embodiment schematic diagram of on-board multimedia device of the present invention;
Fig. 3 to Fig. 6 is the various embodiment schematic diagrames of Power Management Unit in the on-board multimedia device shown in Figure 2.
Embodiment
With reference to shown in Figure 1, a kind of execution mode of on-board multimedia device 1 of the present invention comprises:
Receiving element 20 links to each other with car antenna 10, and the Digital Television radiofrequency signal that demodulation car antenna 10 obtains is exported the sound, the video data stream that comprise in the described Digital Television radiofrequency signal;
By car antenna 10, the radiofrequency signal that above-mentioned on-board multimedia device 1 can receiving digital television, and play on broadcast unit 40 by processing unit 30 decoding backs.This on-board multimedia device thereby can obtain digital television program has in real time strengthened the audiovisual experience function.
Below by instantiation and in conjunction with the corresponding work process above-mentioned on-board multimedia device 1 is further specified.
With reference to shown in Figure 2, among a kind of embodiment of on-board multimedia device 1 of the present invention, described receiving element 20 can comprise:
Tuned cell 201 carries out frequency-conversion processing to the Digital Television radiofrequency signal that car antenna obtains;
Wherein, described tuned cell 201 can be the silicon tuner.Described demodulating unit 202 carries out is demodulated into DMB-TH (Digital Multimedia Broadcast-Terrestrial/Handheld, i.e. DMB-ground/portable) demodulation.Described sound, video data stream are parallel transmission stream (TS).
Described processing unit 30 can comprise:
Audio frequency D/A conversion unit 302 links to each other with audio decoding unit 301, and audio decoding unit 301 decoded digital audio and video signals are converted to simulated audio signal;
Video D/A conversion unit 304 links to each other with video decoding unit 303, and the decoded digital video signal of video decoding unit is converted to analog video signal.
Wherein, described audio decoding unit 301 can be assisted processing unit for many standard audio decodings.Described video decoding unit 303 can comprise the decoding unit of various video standards, for example AVS video decoding unit and MPEG-2 video decoding unit.
Wherein, described analog video signal is a rgb signal.
In one embodiment, described broadcast unit 40 can comprise:
Loudspeaker 402 are exported the corresponding Digital Television sound of simulated audio signal with 302 outputs of audio frequency D/A conversion unit.
In another kind of embodiment, described broadcast unit 40 can comprise:
Audio frequency frequency modulation transmitter unit 403, the simulated audio signal frequency modulation that audio frequency D/A conversion unit 302 is exported is emitted to vehicle-mounted radio, plays the Digital Television sound corresponding with described simulated audio signal by the car audio system that links to each other with vehicle-mounted radio.
Alternatively, described broadcast unit 40 can also comprise:
Alternatively, described display screen 401 can be LCDs.
Alternatively, described display screen 401 can also be for having the LCDs of touch screen function.Correspondingly, can also comprise in the described processing unit 30: touch-responsive unit 305 and control unit 306, touch-responsive unit 305 are used to receive the touch order that described LCDs 401 with touch screen function obtains, and convert corresponding control command to; Control unit 306 is carried out corresponding sound, video controlled function.Described sound, video controlled function can comprise: the sound adjusting of digital TV channel selection, Digital Television, the picture adjusting of Digital Television etc.Above-mentioned sound, video controlled function can be operated via special software, also can directly operate corresponding hardware.
For example, according to the touch order of adjusting display screen contrast, described touch-responsive unit 305 converts described touch order to corresponding video control command earlier, and this video control command is sent to control unit 306, control unit 306 can send this video control command to regulon 404, described regulon 404 just can be adjusted the contrast of display screen according to described video control command, for example increases or reduce the contrast of display screen.
Again for example, according to the touch order of regulating volume output, described touch-responsive unit 305 converts described touch order to corresponding audio frequency control command earlier, and this audio frequency control command is sent to control unit 306, control unit 306 can send this audio frequency control command to audio frequency D/A conversion unit 302, thereby can change the volume output of loudspeaker by the simulated audio signal of change audio frequency D/A conversion unit 302 outputs.For example, by described change simulated audio signal, can increase or reduce the volume output of loudspeaker.
In addition, described on-board multimedia device 1 can also comprise: SDRAM, as the required internal memory of processing unit 30 operating softwares; Visit (CA, the Conditional Access) system that has ready conditions mainly is a decipher function of finishing audio frequency and video; FLASH is as the memory device of systems soft ware and various parameters.
In addition, described on-board multimedia device 1 can also comprise Power Management Unit 50, is used to finish the function such as management of charging and discharging, battery electric quantity management of conversion, the battery of various voltages.The 1.25V/2.5V power supply for example is provided; 1.8V core power supply is provided; The I/O power supply of 3.3V is provided; 5.0V is provided power supply.
Described Power Management Unit can have the embodiment of following several ways of realization:
Described Power Management Unit is the battery case that is used to place battery.Described battery can be rechargeable battery.Described battery case provides power supply to receiving element 20, processing unit 30 and broadcast unit 40, to start receiving element 20, processing unit 30 and broadcast unit 40.The voltage that described battery case provides is 3.7V.
Embodiment 2
The Power Management Unit of present embodiment is a voltage conversion unit, described voltage conversion unit links to each other with vehicle power, and link to each other with described receiving element 20, processing unit 30 and broadcast unit 40 respectively, be used for the voltage transitions that vehicle power provides is become the operating voltage of described on-board multimedia device 1, for example 3.7V.
Embodiment 3
With reference to shown in Figure 3, the Power Management Unit of present embodiment comprises:
The Power Management Unit of present embodiment provides operating voltage by battery to described receiving element 20, processing unit 30 and broadcast unit 40.And become the charging voltage of battery by the voltage transitions that voltage conversion unit 52 provides vehicle power, battery is charged, to replenish battery power consumption.
The operating voltage that described battery provides is 3.7V.
Embodiment 4
With reference to shown in Figure 4, the Power Management Unit of present embodiment comprises:
Electric weight monitoring unit 53, when the battery electric quantity in the battery case 51 was not enough, starting resistor converting unit 52 to the battery charge in the battery case 51, and when battery electric quantity is sufficient, was closed voltage conversion unit 52, with complete charge.
Electric weight monitoring unit 53 in the Power Management Unit of present embodiment has been realized function that battery is charged as required.Have only when battery electric quantity is not enough; just starting resistor converting unit 52 is changed the voltage that vehicle powers provide; come the battery charge in the battery case 51; and when battery electric quantity is sufficient; close voltage conversion unit 52; preventing over-charging of battery, thereby the protection battery can prevent also that battery is overheated and catches fire.In addition, described electric weight monitoring unit 53 when cell voltage is lower than overcurrent protection voltage, can be closed battery case 51.Because when cell voltage is lower than overcurrent protection voltage; if still make battery case 51 continue to receiving element 20, processing unit 30 and broadcast unit 40 power supplies; battery in the battery case 51 is to keep identical power output, will increase discharging current, also will damage battery and discharging current is excessive.
With respect to embodiment 3, the Power Management Unit of present embodiment more can be saved the consumption of vehicle power.
The operating voltage that described battery provides is 3.7V.
Embodiment 5
With reference to shown in Figure 5, the Power Management Unit of present embodiment comprises:
Power supply switch unit 55, when vehicle power provided voltage, starting resistor converting unit 54 provided described on-board multimedia device operation required operating voltage; When no vehicle power provided voltage, starting battery case 51 provided described on-board multimedia device operation required operating voltage.
Power supply switch unit 55 in the Power Management Unit of present embodiment has realized providing flexibly the function of operating voltage.When vehicle power provided voltage, the voltage transitions that vehicle power is provided with regard to starting resistor converting unit 54 became the operating voltage of on-board multimedia device, for example 3.7V.And when no vehicle power provided voltage, just starting battery case 51 provided described on-board multimedia device operation required operating voltage, and the voltage that described battery provides is 3.7V.
Embodiment 6
With reference to shown in Figure 6, the Power Management Unit of present embodiment comprises:
First voltage conversion unit 56 links to each other with vehicle power, is used for the voltage transitions that vehicle power provides is become the operating voltage of described on-board multimedia device;
Second voltage conversion unit 57 links to each other with battery case 51 with vehicle power, is used for the voltage transitions that vehicle power provides is become the charging voltage of battery;
Electric weight monitoring unit 58 when the battery electric quantity in the battery case 51 is not enough, starts second voltage conversion unit 57, to the battery charge in the battery case 51, and when battery electric quantity is sufficient, closes second voltage conversion unit 57, with complete charge;
Power supply switch unit 59, when vehicle power provided voltage, starting first voltage conversion unit 56 provided described on-board multimedia device operation required operating voltage; When no vehicle power provided voltage, starting battery case 51 provided described on-board multimedia device operation required operating voltage.
Power supply switch unit 59 in the Power Management Unit of present embodiment has been realized the function that operating voltage is provided flexibly and battery is charged as required.When vehicle power provides voltage, become the operating voltage of on-board multimedia device, for example 3.7V with regard to the voltage transitions that starts first voltage conversion unit 56 vehicle power is provided.And when no vehicle power provided voltage, just starting battery case 51 provided described on-board multimedia device operation required operating voltage, and the voltage that described battery provides is 3.7V.
And; electric weight monitoring unit 58 has only when battery electric quantity is not enough; just start the voltage that second voltage conversion unit, 57 conversion vehicle powers provide; come the battery charge in the battery case 51; and when battery electric quantity is sufficient, close second voltage conversion unit 57, to prevent over-charging of battery; thereby the protection battery can prevent also that battery is overheated and catches fire.In addition, described electric weight monitoring unit 58 when cell voltage is lower than overcurrent protection voltage, can be closed battery case 51.Because when cell voltage is lower than overcurrent protection voltage; if still make battery case 51 continue to receiving element 20, processing unit 30 and broadcast unit 40 power supplies; battery in the battery case 51 is to keep identical power output, will increase discharging current, also will damage battery and discharging current is excessive.
The Power Management Unit of present embodiment can be saved the consumption of vehicle power.
According to the above description, the course of work that can learn described on-board multimedia device 1 is as follows: Power Management Unit provides described on-board multimedia device 1 operation required operating voltage, after described on-board multimedia device 1 starts, after it obtains the radiofrequency signal of Digital Television by car antenna, at first carry out frequency-conversion processing, obtain sound, video data stream by demodulating unit 202 demodulation then by tuned cell 201.Described demodulating unit 202 transfers to audio decoding unit 301 and video decoding unit 302 respectively with sound, video data stream.Described audio decoding unit 301 and video decoding unit 302 obtain digital audio and video signals and digital video signal respectively obtaining just to carry out corresponding decoding after the corresponding data flow separately.And transfer to audio frequency D/A conversion unit 302 respectively and video D/A conversion unit 304 carries out digital-to-analogue conversion, to obtain simulated audio signal and analog video signal.Described simulated audio signal can be transferred to loudspeaker 402 or audio frequency frequency modulation transmitter unit 403 sound with the output Digital Television, described analog video signal then can be transferred to display screen 401, also can be via transferring to display screen 401 after the adjusting of regulon 404 again, to play the picture of Digital Television.
The present invention also provides a kind of portable multimedia device, and its a kind of execution mode comprises:
Antenna;
Receiving element links to each other with antenna, and the Digital Television radiofrequency signal that the demodulation antenna obtains is exported the sound, the video data stream that comprise in the described Digital Television radiofrequency signal;
Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal;
Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.
The structural similarity of described portable multimedia device and above-mentioned on-board multimedia device, difference only is that described portable multimedia device self has antenna.
Alternatively, described portable multimedia device also has composite video broadcast singal (CVBS, the Composite Video Broadcast Signal) output interface that links to each other with processing unit.This interface is provided and described sound, the corresponding composite video broadcast singal of vision signal by described processing unit.Thereby other display equipment can link to each other with described portable multimedia device via this output interface, to play Digital Television.At this moment, described portable multimedia device also is equivalent to realize the function of set-top box.
Though the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art without departing from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be as the criterion with claim institute restricted portion.
Claims (19)
1. an on-board multimedia device is characterized in that, comprising:
Receiving element links to each other with car antenna, and the Digital Television radiofrequency signal that the demodulation car antenna obtains is exported the sound, the video data stream that comprise in the described Digital Television radiofrequency signal;
Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal;
Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.
2. on-board multimedia device as claimed in claim 1 is characterized in that, described receiving element comprises:
Tuned cell carries out frequency-conversion processing to the Digital Television radiofrequency signal that car antenna obtains;
Demodulating unit carries out demodulation to the Digital Television radiofrequency signal after the frequency-conversion processing, to export corresponding sound, video data stream.
3. on-board multimedia device as claimed in claim 2 is characterized in that,
Described tuned cell is the silicon tuner;
Described demodulating unit carries out is demodulated into the DMB-TH demodulation.
4. on-board multimedia device as claimed in claim 1 is characterized in that, described processing unit comprises:
Audio decoding unit is to the audio data stream of the receiving element output acquisition digital audio and video signals of decoding;
The audio frequency D/A conversion unit links to each other with audio decoding unit, and the decoded digital audio and video signals of audio decoding unit is converted to simulated audio signal;
Video decoding unit is to the video data stream of the receiving element output acquisition digital video signal of decoding;
The video D/A conversion unit links to each other with video decoding unit, and the decoded digital video signal of video decoding unit is converted to analog video signal.
5. on-board multimedia device as claimed in claim 4 is characterized in that, described video decoding unit comprises: AVS video decoding unit and MPEG-2 video decoding unit.
6. on-board multimedia device as claimed in claim 4 is characterized in that, described audio decoding unit is that processing unit is assisted in many standard audio decodings.
7. on-board multimedia device as claimed in claim 4 is characterized in that, described broadcast unit comprises:
Display screen is play the corresponding digital TV picture of analog video signal with processing unit output;
Loudspeaker are exported the corresponding Digital Television sound of simulated audio signal with processing unit output.
8. on-board multimedia device as claimed in claim 4 is characterized in that, described broadcast unit comprises:
Display screen is play the corresponding digital TV picture of analog video signal with processing unit output;
Audio frequency frequency modulation transmitter unit, the simulated audio signal frequency modulation that processing unit is exported is emitted to vehicle-mounted radio, plays the Digital Television sound corresponding with described simulated audio signal by the car audio system that links to each other with vehicle-mounted radio.
9. as claim 7 or 8 described on-board multimedia devices, it is characterized in that, described broadcast unit also comprises regulon, any one that is used for that combine digital television image convergent-divergent, display backlight adjustment, brightness of display screen adjustment, display screen contrast adjustment, display screen colourity adjust or multiple operation.
10. as claim 7 or 8 described on-board multimedia devices, it is characterized in that described display screen is a LCDs.
11. as claim 7 or 8 described on-board multimedia devices, it is characterized in that,
Described display screen is the LCDs with touch screen function;
Described processing unit also comprises:
The touch-responsive unit receives the touch order that described LCDs with touch screen function obtains, and converts corresponding control command to;
And control unit, carry out corresponding sound, video controlled function.
12. on-board multimedia device as claimed in claim 9 is characterized in that,
Described display screen is the LCDs with touch screen function;
Described processing unit also comprises:
The touch-responsive unit receives the touch order that described LCDs with touch screen function obtains, and converts corresponding control command to;
And control unit, carry out corresponding sound, video controlled function.
13. a portable multimedia device is characterized in that, comprising:
Antenna;
Receiving element links to each other with antenna, and the Digital Television radiofrequency signal that the demodulation antenna obtains is exported the sound, the video data stream that comprise in the described Digital Television radiofrequency signal;
Processing unit is decoded to sound, video data stream that receiving element is exported, and exports corresponding sound, vision signal;
Broadcast unit receives sound, vision signal that processing unit is exported, output respective digital sound of television and picture.
14. portable multimedia device as claimed in claim 13 is characterized in that, also comprises: the CVBS output interface that links to each other with processing unit.
15. portable multimedia device as claimed in claim 13 is characterized in that, described receiving element comprises:
Tuned cell carries out frequency-conversion processing to the Digital Television radiofrequency signal that car antenna obtains;
Demodulating unit carries out demodulation to the Digital Television radiofrequency signal after the frequency-conversion processing, to export corresponding sound, video data stream.
16. portable multimedia device as claimed in claim 13 is characterized in that, described processing unit comprises:
Audio decoding unit is to the audio data stream of the receiving element output acquisition digital audio and video signals of decoding;
The audio frequency D/A conversion unit links to each other with audio decoding unit, and the decoded digital audio and video signals of audio decoding unit is converted to simulated audio signal;
Video decoding unit is to the video data stream of the receiving element output acquisition digital video signal of decoding;
The video D/A conversion unit links to each other with video decoding unit, and the decoded digital video signal of video decoding unit is converted to analog video signal.
17. portable media device as claimed in claim 16 is characterized in that, described broadcast unit comprises:
Display screen is play the corresponding digital TV picture of analog video signal with processing unit output;
Loudspeaker are exported the corresponding Digital Television sound of simulated audio signal with processing unit output.
18. portable multimedia device as claimed in claim 17 is characterized in that, described display screen is a LCDs.
19. portable multimedia device as claimed in claim 17 is characterized in that,
Described display screen is the LCDs with touch screen function;
Described processing unit also comprises:
The touch-responsive unit receives the touch order that described LCDs with touch screen function obtains, and converts corresponding control command to;
And control unit, carry out corresponding sound, video controlled function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100507053A CN101594495A (en) | 2009-05-07 | 2009-05-07 | On-board multimedia device and portable multimedia device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100507053A CN101594495A (en) | 2009-05-07 | 2009-05-07 | On-board multimedia device and portable multimedia device |
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| Publication Number | Publication Date |
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| CN101594495A true CN101594495A (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009100507053A Pending CN101594495A (en) | 2009-05-07 | 2009-05-07 | On-board multimedia device and portable multimedia device |
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| CN (1) | CN101594495A (en) |
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- 2009-05-07 CN CNA2009100507053A patent/CN101594495A/en active Pending
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Open date: 20091202 |