CN101170634A - Video playing chip, system and related method for share digital simulation converter - Google Patents
Video playing chip, system and related method for share digital simulation converter Download PDFInfo
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- CN101170634A CN101170634A CNA2006101424162A CN200610142416A CN101170634A CN 101170634 A CN101170634 A CN 101170634A CN A2006101424162 A CNA2006101424162 A CN A2006101424162A CN 200610142416 A CN200610142416 A CN 200610142416A CN 101170634 A CN101170634 A CN 101170634A
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Abstract
A video play chip is provided, which comprises a video coder, a time-schedule controller, a multiplexor and a group of digital-analog converters. The video coder generates television video signals. The time-schedule controller generates output signals. The multiplexor has a first group of input terminals for coupling with the video coder, a second group of input terminals for coupling with the time-schedule controller, a control terminal, and a group of output terminals. The multiplexor outputs the television video signal or output signal from the group of output terminals based on the control signal of the control terminal. The group of digital-analog converters is coupled with the group of output terminals of the multiplexor to convert the television video signal to a first play signal in analog format and convert the output signal to a second play signal.
Description
Technical field
The present invention provides a kind of video playing chip and audio-video system of sharing digital analog converter, refers to a kind of video playing chip and audio-video system that utilizes multiplexer to select the output signal form especially.
Background technology
Along with information develops progress with Play Technique for Multimedia apace, various audio-visual devices are used to the information that image and sound are provided and propagate and pleasure of the senses, yet along with making rapid progress of audio-visual technology, the image of multiple unlike signal specification and transmission of sound signals are also arisen at the historic moment.A Digital Television is supported multiple simulation display interface usually, for example picture signal just has the videoblankingsync of being divided into (CVBS, compositesignal), S-video (S-video) picture signal, high-resolution video (YPbPr) signal etc., Thin Film Transistor-LCD (TFT-LCD) is then supported the picture signal of rgb format.In order to satisfy external tv simultaneously or directly to watch image by built-in Thin Film Transistor-LCD (TFT-LCD), usually have two groups of digital analog converters in the video playing chip, one group in order to the picture signal of output Composite Video and SVideo form (or the YPbPr form) AV terminal to external tv, and another group is then carried out image in order to picture signal to the built-in Thin Film Transistor-LCD of output R, G and B form and play.
Because the evolution of multimedia technology and digital storage technology, the function that media product provided is more and more now.In recent years, the electronic multimedia device is inseparable with daily life, reach its maturity because specialize in mobile phone, Portable media player, Digital Television and the employed multimedia of other wireless device, in order to allow these devices can possess the function of more diversification, then the video playing chip in the device has been played the part of conclusive role.Digital analog converter is usually used in the electronic multimedia devices such as DVD drive, VCD CD-ROM drive, portable digital-video player, Digital Television, home audio-visual product, and the user can convert the picture signal of importing to analog format with playing image by digital analog converter.
Please refer to Fig. 1.Fig. 1 is the schematic diagram of the video playing chip 10 of prior art.Video playing chip 10 comprises memory 11, image decoder 12, scale controller 16, television encoder 14, time schedule controller 18, first group of analog-digital converter 15 and second group of analog-digital converter 17.First group of analog-digital converter 15 comprises three analog-digital converter DAC1, and second group of analog-digital converter 17 comprises three analog-digital converter DAC2.Memory 11 is used for the store images data, can be static RAM (SRAM).Image decoder 12 is coupled to the output of memory 11, is used for this view data is decoded to produce first picture signal.Scale controller 16 is coupled between image decoder 12 and the time schedule controller 18, is used for adjusting this first picture signal to produce second picture signal.Television encoder 14 has input 142, is coupled to the output 122 of image decoder 12, is used for receiving this first picture signal.Television encoder 14 has three analog-digital converter DAC1 that three outputs 144,146,148 are respectively coupled to first group of analog-digital converter 15.Television encoder 14 is used for converting this first picture signal to one group of television video frequency signal.Three analog-digital converter DAC1 of first group of analog-digital converter 15 are used for converting this group television video frequency signal of television encoder 14 outputs to analog format, export CVBS, Y and C signal respectively.Time schedule controller 18 has input 182, is coupled to the output 162 of scale controller 16, is used for receiving this second picture signal.Time schedule controller 18 has three analog-digital converter DAC2 that three outputs 184,186,188 are respectively coupled to second group of analog-digital converter 17.Time schedule controller 18 is used for producing corresponding one group of output signal according to this second picture signal that is received.Three analog-digital converter DAC2 of second group of analog-digital converter 17 are used for converting this group output signal of time schedule controller 18 outputs to analog format, export R, G and B signal respectively.Wherein, image decoder 12 can be the dynamic image expert group second type decoder (MPEG2 Decoder).
Because in the prior art, in order to satisfy external tv simultaneously or directly to watch image by built-in Thin Film Transistor-LCD (TFT-LCD), usually have two groups of digital analog converters in the video playing chip, one group in order to the picture signal of output Composite Video and the S Video form AV terminal to TV, utilize TV to carry out image and play, another group is then play-overed image in order to picture signal to the built-in Thin Film Transistor-LCD of output R, G and B form.Above-mentionedly utilize two groups of digital analog converters to come the mode of switching signal quite uneconomical, and digital analog converter itself occupies sizable area with cost, just can significantly promote chip size and manufacturing cost thus.
Summary of the invention
The present invention provides a kind of video playing chip of sharing digital analog converter, and it comprises television encoder, time schedule controller, multiplexer and set of number analog converter.This television encoder is used for converting first picture signal to television video frequency signal.This time schedule controller is used for producing corresponding output signal according to second picture signal that is received.This multiplexer has first group of input, second group of input, control end, and one group of output, this first group of input is coupled to this television encoder, be used for receiving this television video frequency signal, this second group of input is coupled to this time schedule controller, be used for receiving this output signal, this multiplexer is the control signal that receives according to this control end and export this television video frequency signal or this output signal in this group output.This group digital analog converter is coupled to this group output of this multiplexer, is used for this television video frequency signal with the output of this multiplexer to convert first play signal of analog format to and this output signal of this multiplexer output is converted to second play signal of analog format.
The present invention provides a kind of audio-video system of sharing digital analog converter, and it comprises audio-visual control device, video playing chip and display unit.This audio-visual control device is used to provide view data.This video playing chip is coupled to this audio-visual control device.This video playing chip comprises television encoder, time schedule controller, multiplexer and set of number analog converter.Wherein, this television encoder is used for converting first picture signal to television video frequency signal.This time schedule controller is used for producing corresponding output signal according to second picture signal that is received.This multiplexer has first group of input, second group of input, control end, and one group of output, this first group of input is coupled to this television encoder, be used for receiving this television video frequency signal, this second group of input is coupled to this time schedule controller, be used for receiving this output signal, this multiplexer is the control signal that receives according to this control end and export this television video frequency signal or this output signal in this group output.This group digital analog converter is coupled to this group output of this multiplexer, is used for this television video frequency signal with the output of this multiplexer to convert first play signal of analog format to and this output signal of this multiplexer output is converted to second play signal of analog format.This display unit is coupled to this group digital analog converter, is used for showing this first play signal and this second play signal of this analog format.
The present invention provides a kind of audio-visual player method of sharing the digital analog converter of video playing chip, includes and utilizes television encoder to convert first picture signal to television video frequency signal; Utilize time schedule controller to produce corresponding output signal according to second picture signal that is received; Select this television video frequency signal of output or this output signal; And this television video frequency signal that will select output converts first play signal of analog format to and this output signal that will select to export converts second play signal of analog format to.Wherein.This audio-visual player method also comprises this first play signal that shows this analog format and this second play signal that shows this analog format.
Description of drawings
Fig. 1 is the schematic diagram of the video playing chip of prior art.
Fig. 2 is the schematic diagram of video playing chip of the present invention.
Fig. 3 is the schematic diagram of video-audio playing system of the present invention.
Fig. 4 is the schematic diagram of the flow process of the audio-visual player method of the digital analog converter of sharing video playing chip of the present invention.
[main element label declaration]
10,20 video playing chips
11,21 memories, 12,22 image decoders
16,26 scale controllers, 14,24 television encoders
18,28 time schedule controllers, 25 multiplexers
15 first groups of analog-digital converters
17 second groups of analog-digital converters
19 the 3rd groups of analog-digital converters
DAC1, DAC2, DAC3 analog-digital converter
CVBS, Y, C, R, G, B picture signal
251-256、142、182、242、282、362、
364,366,382,384,386 inputs
122、162、144、146、148、184、186、188、257-259、
222,262,244,246,248,284,286,288 outputs
250 control ends
30 video-audio playing systems
32 audio-visual control device
36 video screens, 38 LCD
40 flow processs
The 402-420 step
Embodiment
Please refer to Fig. 2.Fig. 2 is the schematic diagram of video playing chip 20 of the present invention.Video playing chip 20 comprises memory 21, image decoder 22, scale controller 26, television encoder 24, time schedule controller 28, multiplexer 25 and the 3rd group of analog-digital converter 19.The 3rd group of analog-digital converter 19 comprises three analog-digital converter DAC3.Memory 21 is used for the store images data, can be static RAM.Image decoder 22 is coupled to the output of memory 21, is used for this view data is decoded to produce first picture signal.Scale controller 26 is coupled between image decoder 22 and the time schedule controller 28, is used for adjusting this first picture signal to produce second picture signal.Multiplexer 25 comprises six input 251-256, three output 257-259 and control end 250.Television encoder 24 has input 242, is coupled to the output 222 of image decoder 22, is used for receiving this first picture signal.Television encoder 24 has three inputs 251,252,253 that three outputs 244,246,248 are respectively coupled to multiplexer 25.Television encoder 24 is used for converting this first picture signal to one group of television video frequency signal.Time schedule controller 28 has input 282, is coupled to the output 262 of scale controller 26, is used for receiving this second picture signal.Time schedule controller 28 has three inputs 254,255,256 that three outputs 284,286,288 are respectively coupled to multiplexer 25.Time schedule controller 28 is used for producing corresponding one group of output signal according to this second picture signal that is received.If this group television video frequency signal that multiplexer 25 selects output television encoder 14 to be exported by the control signal of control end 250, then three analog-digital converter DAC3 of the 3rd group of analog-digital converter 19 are used for converting this group television video frequency signal to analog format, export first play signal of CVBS, Y and C form respectively.If this group output signal that multiplexer 25 selects output timing controller 18 to be exported by the control signal of control end 250, then three analog-digital converter DAC3 of the 3rd group of analog-digital converter 19 are used for converting this group output signal to analog format, export second play signal of R, G and B form respectively.Wherein, image decoder 12 can be the dynamic image expert group second type decoder.
Please refer to Fig. 3.Fig. 3 is the schematic diagram of video-audio playing system 30 of the present invention.Video-audio playing system 30 comprises audio-visual control device 32, video playing chip 20, video screen 36 and LCD 38.In an embodiment, audio-visual control device 32 can be Digital Television, the multi-functional CD-ROM drive of portable digital or digital versatile disc videocorder, and audio-visual control device 32 is used to provide the source of view data.Video playing chip 20 is coupled to audio-visual control device 32, is used for receiving this view data.Video playing chip 20 comprises memory 21, image decoder 22, scale controller 26, television encoder 24, time schedule controller 28, multiplexer 25 and the 3rd group of analog-digital converter 19.Its coupling mode and shown in Figure 2 identical is narrated no longer in detail in this.Video screen 36 has three inputs 362,364,366, be respectively coupled to three analog-digital converter DAC3 of the 3rd group of analog-digital converter 19, if this group television video frequency signal that multiplexer 25 selects output television encoder 14 to be exported by the control signal of control end 250, then three analog-digital converter DAC 3 of the 3rd group of analog-digital converter 19 are used for converting this group television video frequency signal to analog format, export CVBS respectively, first play signal of Y and C form is to three inputs 362 of video screen 36,364,366, utilize video screen 36 to play first play signal, wherein three inputs 362,364,366 are general common AV terminal.LCD 38 has three inputs 382,384,386, be respectively coupled to three analog-digital converter DAC3 of the 3rd group of analog-digital converter 19, if this group output signal that multiplexer 25 selects output timing controller 18 to be exported by the control signal of control end 250, then three analog-digital converter DAC3 of the 3rd group of analog-digital converter 19 are used for converting this group output signal to analog format, export R respectively, second play signal of G and B form is to three inputs 382 of LCD 38,384,386, so can utilize LCD 38 to play second play signal.Wherein, LCD 38 can be the built-in Thin Film Transistor-LCD (TFT-LCD) of audio-visual control device 32.
Please refer to Fig. 4.Fig. 4 is the schematic diagram of the flow process 40 of the audio-visual player method of the digital analog converter of sharing video playing chip of the present invention.Flow process 40 comprises following step:
Step 402: utilize digital multi CD-ROM drive or Digital Television to play view data.
Step 404: store this view data.
Step 406: this view data is decoded to produce first picture signal.
Step 408: adjust this first picture signal to produce second picture signal.
Step 410: utilize television encoder to convert this first picture signal to television video frequency signal.
Step 412: utilize time schedule controller to produce corresponding output signal according to this second picture signal that is received.
Step 414: select this television video frequency signal of output or this output signal.
Step 416:, convert thereof into first play signal of the CompositeVideo and the S Video form of simulation if select this television video frequency signal of output.
Step 418:, convert thereof into second play signal of R, G and the B form of simulation if select this output signal of output.
Step 420: first play signal or second play signal that show this analog format.
In step 406, be to utilize image decoder that this view data is decoded to produce this first picture signal.In step 408, then adjust this first picture signal to produce this second picture signal by scale controller.In step 410, utilize television encoder to convert this first picture signal to this television video frequency signal, wherein this television video frequency signal can be videoblankingsync (CVBS, compositesignal), signal such as S-video picture signal, high-resolution video (YPbPr) signal.In this output signal that step 412 produced then is the picture signal of R, G and B form.Select this television video frequency signal of output or this output signal by step 414, then step 416 and step 418 can be utilized the selection that same group of digital analog converter done according to step 414, and accordingly television video frequency signal is converted to first play signal of the Composite Video of simulation and S Video form and output signal is converted to the R of simulation, second play signal of G and B form, and respectively with first play signal and second play signal, play by different paths, promptly be, utilize the AV terminal of TV to be sent to TV first play signal and play, perhaps, second play signal is sent to built-in Thin Film Transistor-LCD to play.
Above-described embodiment only is used for illustrating the present invention, does not limit to category of the present invention.The image decoder of being mentioned in the literary composition 22 is not limited to the dynamic image expert group second type decoder (MPEG-2Decoder), also can be other image decoder.When multiplexer 25 selects to export this group television video frequency signal that television encoder 24 is exported by the control signal of control end 250, the 3rd group of three digital analog converter DAC3 that digital analog converter 19 is comprised then, except the AV terminal that first play signal power supply that can be used to export Composite Video and S Video form is looked is used, also can be used to export first play signal of Y, Pb, Pr form or other form, be not limited thereto.In addition, display unit can be the display of circumscribed or built-in display, as video screen, Thin Film Transistor-LCD or other display unit.
As from the foregoing, the invention provides a kind of video playing chip and audio-video system of sharing digital analog converter.In video playing chip 20, increase multiplexer 25, selection by multiplexer 25, make external tv and built-in screen two paths use same group of digital analog converter, both can export the AV terminal of first play signal of Composite Video and S Video form (or YPbPr form) to TV, second play signal that can export R, G and B form again to built-in Thin Film Transistor-LCD with playing image.Thus, can omit the set of number analog converter, save chip area and cost, also can reduce the power that the set of number analog converter is consumed, quite important in the Portable media player.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (32)
1. the video playing chip that can share digital analog converter includes:
Television encoder is used for converting first picture signal to television video frequency signal;
Time schedule controller is used for producing corresponding output signal according to second picture signal that is received;
Multiplexer, it has first group of input, second group of input, control end, and one group of output, this first group of input is coupled to this television encoder, be used for receiving this television video frequency signal, this second group of input is coupled to this time schedule controller, be used for receiving this output signal, this multiplexer is according to control signal that this control end received and export this television video frequency signal or this output signal in this group output; And
The set of number analog converter, be coupled to this group output of this multiplexer, be used for converting this television video frequency signal of this multiplexer output to first play signal of analog format and second play signal that this output signal of this multiplexer output is converted to analog format.
2. video playing chip according to claim 1, it also comprises image decoder, is coupled to this television encoder, is used for view data is decoded to produce this first picture signal.
3. video playing chip according to claim 2, wherein this image decoder is the dynamic image expert group second type decoder.
4. video playing chip according to claim 2, it also comprises scale controller, is coupled between this image decoder and this time schedule controller, is used for adjusting this first picture signal to produce this second picture signal.
5. video playing chip according to claim 2, it also comprises memory, is coupled to this image decoder, is used for storing this view data that this image decoder is desired to decode.
6. video playing chip according to claim 5, wherein this memory is a static RAM.
7. video playing chip according to claim 1, wherein this group digital analog converter comprises three digital analog converters, is respectively coupled to R, G, B connectivity port, is used for exporting this second play signal of R, G and B form.
8. video playing chip according to claim 1, wherein this group digital analog converter comprises three digital analog converters, be respectively coupled to composite video terminal connectivity port and two S-video terminal connectivity ports, be used for exporting this first play signal of composite video and S-video format.
9. video playing chip according to claim 1, wherein this group digital analog converter comprises three digital analog converters, is respectively coupled to Y, Pb, Pr connectivity port, is used for exporting this first play signal of Y, Pb, Pr form.
10. the audio-video system that can share digital analog converter includes:
Audio-visual control device is used to provide view data;
Video playing chip is coupled to this audio-visual control device, and this video playing chip comprises:
Television encoder is used for converting first picture signal to television video frequency signal;
Time schedule controller is used for producing corresponding output signal according to second picture signal that is received;
Multiplexer, it has first group of input, second group of input, control end, and one group of output, this first group of input is coupled to this television encoder, be used for receiving this television video frequency signal, this second group of input is coupled to this time schedule controller, be used for receiving this output signal, this multiplexer is the control signal that receives according to this control end and export this television video frequency signal or this output signal in this group output; And
The set of number analog converter, be coupled to this group output of this multiplexer, be used for converting this television video frequency signal of this multiplexer output to first play signal of analog format and second play signal that this output signal of this multiplexer output is converted to analog format; And
Display unit is coupled to one group of output of this group digital analog converter, is used for showing this first play signal and this second play signal of this analog format.
11. audio-video system according to claim 10, wherein this video playing chip also comprises image decoder, is coupled to this television encoder, is used for view data is decoded to produce this first picture signal.
12. audio-video system according to claim 11, wherein this image decoder is the dynamic image expert group second type decoder.
13. audio-video system according to claim 11, wherein this video playing chip also comprises scale controller, is coupled between this image decoder and this time schedule controller, is used for adjusting this first picture signal to produce this second picture signal.
14. audio-video system according to claim 11, wherein this video playing chip also comprises memory, is coupled to this image decoder, is used for storing this view data that this image decoder is desired to decode.
15. audio-video system according to claim 14, wherein this memory is a static RAM.
16. audio-video system according to claim 10, wherein this group digital analog converter comprises three digital analog converters, is respectively coupled to R, G, B connectivity port, is used for exporting this second play signal of R, G and B form.
17. audio-video system according to claim 10, wherein this group digital analog converter comprises three digital analog converters, be respectively coupled to composite video terminal connectivity port and two S-video terminal connectivity ports, be used for exporting this first play signal of composite video and S-video format.
18. audio-video system according to claim 10, wherein this group digital analog converter comprises three digital analog converters, is respectively coupled to Y, Pb, Pr connectivity port, is used for exporting this first play signal of Y, Pb, Pr form.
19. audio-video system according to claim 10, wherein this audio-visual control device is the digital multi CD-ROM drive.
20. audio-video system according to claim 10, wherein this audio-visual control device is the digital versatile disc videocorder.
21. audio-video system according to claim 10, wherein this audio-visual control device is a Digital Television.
22. audio-video system according to claim 10, wherein this display unit is a video screen.
23. audio-video system according to claim 10, wherein this display unit is a Thin Film Transistor-LCD.
24. the audio-visual player method that can share the digital analog converter of video playing chip includes:
(a) utilize television encoder to convert first picture signal to television video frequency signal;
(b) utilize time schedule controller to produce corresponding output signal according to second picture signal that is received;
(c) select this television video frequency signal of output or this output signal; And
(d) will select this television video frequency signal of output to convert first play signal of analog format to and this output signal that will select to export converts second play signal of analog format to.
25. audio-visual player method according to claim 24, wherein step (d) converts this first play signal of composite video and S-video format to for this television video frequency signal that will select output.
26. audio-visual player method according to claim 24, wherein step (d) converts this first play signal of Y, Pb, Pr form to for this television video frequency signal that will select output.
27. audio-visual player method according to claim 24, wherein step (d) is to select output
This output signal convert this second play signal of R, G and B form to.
28. audio-visual player method according to claim 24, it also comprises this first play signal that shows this analog format.
29. audio-visual player method according to claim 24, it also comprises this second play signal that shows this analog format.
30. audio-visual player method according to claim 24, it also comprises decodes view data to produce this first picture signal.
31. audio-visual player method according to claim 30, it also comprises this view data that storage is desired to decode.
32. audio-visual player method according to claim 24, it also comprises adjusts this first picture signal to produce this second picture signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101424162A CN101170634A (en) | 2006-10-23 | 2006-10-23 | Video playing chip, system and related method for share digital simulation converter |
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|---|---|---|---|
| CNA2006101424162A CN101170634A (en) | 2006-10-23 | 2006-10-23 | Video playing chip, system and related method for share digital simulation converter |
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| CN101170634A true CN101170634A (en) | 2008-04-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002325A (en) * | 2012-12-20 | 2013-03-27 | 湖南纽曼数码科技有限公司 | Vehicle-mounted device for transmitting digital video/audio signals by using twisted pair |
| CN107027034A (en) * | 2016-01-29 | 2017-08-08 | 意法半导体 (Alps) 有限公司 | Analog video signal provides circuit |
-
2006
- 2006-10-23 CN CNA2006101424162A patent/CN101170634A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002325A (en) * | 2012-12-20 | 2013-03-27 | 湖南纽曼数码科技有限公司 | Vehicle-mounted device for transmitting digital video/audio signals by using twisted pair |
| CN103002325B (en) * | 2012-12-20 | 2015-11-11 | 湖南纽曼数码科技有限公司 | A kind of mobile unit utilizing Double-strand transmission digital audio-video signal |
| CN107027034A (en) * | 2016-01-29 | 2017-08-08 | 意法半导体 (Alps) 有限公司 | Analog video signal provides circuit |
| CN107027034B (en) * | 2016-01-29 | 2020-06-23 | 意法半导体 (Alps) 有限公司 | Analog video signal providing circuit |
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