CN101778196B - Multimedia device - Google Patents
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- CN101778196B CN101778196B CN201010106621XA CN201010106621A CN101778196B CN 101778196 B CN101778196 B CN 101778196B CN 201010106621X A CN201010106621X A CN 201010106621XA CN 201010106621 A CN201010106621 A CN 201010106621A CN 101778196 B CN101778196 B CN 101778196B
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Abstract
The invention provides a multimedia device which relates to the field of communication. The multimedia device is provided with a plurality of video output ends. A user can selectively connect one video output end to a television. A detector can detect an analog video signal on the video output end. When the user plugs the first video output end out and connects the video output end, the detector can control a first digital-analog converter to stop generating a first analog video signal from the first video output end, and then control a second digital-analog converter to stop generating a second analog video signal from the second video output end.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of multimedia device.
Background technology
Multimedia device now (multi-media apparatus), for example electronic game machine (Game player) or DVD player (Media player) are to utilize holding wire that video-audio signal is passed to display unit, for example television set.Because television set now is main to receive the simulation video-audio signal still, therefore, multimedia device must provide the corresponding simulating video-audio signal to export television set to.
In general, multimedia device can be exported the vision signal (videosignal) of multiple different size simultaneously.And the vision signal that multimedia device provided of standard specification comprises: composite video broadcast singal (Composite Video Broadcast Signal; Abbreviation CVBS signal), light tone separation signal (Separate Video signal, S-Video signal), light tone composition signal (abbreviation YUV signal), RGB composition signal (abbreviation rgb signal).Wherein, the S-Video signal is made up of luminance signal (luminancesignal is called for short Y-signal) and color signal (color signal is called for short the C signal); YUV signal is made up of luminance signal (luminance signal is called for short Y-signal) and two carrier chrominance signals (chrominance signal is called for short U signal and V signal); Rgb signal comprises danger signal (red signal; Abbreviation R signal), green (green signal; Be called for short the G signal) and blue signal (blue signal is called for short the B signal), RGB has two interfaces; One is used for and the rgb signal that itself has synchronizing signal (for example G has synchronizing signal), and another is used for arranging in pairs or groups each other with the CVBS signal and forms the SCART interface.
Because the inner control circuit of multimedia device is a digital circuit, therefore, must supply a pattern in the multimedia device/digital quantizer (being called for short DAC), after being converted into mode video signal, digital video signal just can be passed to television set.
Suppose that multimedia device supports the vision signal of multiple different-format simultaneously, because multimedia device itself also can't learn that the user utilizes the vision signal of any form to be connected to television set.Therefore, in case after the electric power starting, the output of all vision signals must normal output analog video signal.Yet the generation analog video signal that such way of output will cause DAC to continue causes the multimedia device unnecessary energy waste.
Like U.S. Patent Publication sign indicating number US2009/0158066, disclose a kind of " using automatically, detection DAC has non-loaded power management ".Wherein, this patent only can detect untapped analog video signal, and closes corresponding DAC.Yet when the electric power starting of multimedia device, the user probably changes the annexation of analog video signal again, and at this moment, buttoned-up DAC can't be unlocked once more.
For example, the vision signal of the exportable three kinds of different sizes of multimedia device, and first VT links to each other with television set through holding wire.After this multimedia device was opened, the detector in the multimedia device was confirmed the annexation of first vision signal and television set, and closes the pairing DAC of other vision signals.Yet, in case after the multimedia device power supply was unlocked, the user can't change the annexation between first vision signal and the television set again.That is to say, behind television boot-strap,, and holding wire is connected between second VT and the television set if the user pulls out the holding wire between first VT and the television set.At this moment, television set can't normally receive second vision signal.
Summary of the invention
The present invention provides a kind of multimedia device, can detect the user at any time and whether change the annexation between video signal and the television set, and open and close corresponding DAC.
The present invention proposes a kind of multimedia device, comprising:
Video output terminals is used to connect display unit;
Resistance is connected between said video output terminals and the earth terminal; And
Control circuit comprises:
The digital video signal generator is used for index signal between output digital video signal and clear area;
Digital-analog convertor; Be used to receive said digital video signal; And control end reception control signal through disposing; Adopt said control signal to enable said digital-analog convertor, convert said digital video signal into analog video signal, and said analog video signal is transferred to said video output terminals; And
Detector; Be used to receive said analog video signal, when index signal is moved between sense cycle and said clear area, export said control signal; And, enable said digital-analog convertor through said control signal according to the transmission state of said analog video signal and this display unit; When said analog video signal can't transfer to said display unit; Said detector utilizes said control signal to forbid said digital-analog convertor; And; When said analog video signal transfers to said display unit, utilize said control signal to keep and enable said digital-analog convertor;
Wherein, the transmission state of said analog video signal and said display unit is to confirm according to said analog video signal and the relatively back consequential signal that generates of critical voltage.
The present invention more proposes a kind of multimedia device, comprising:
First video output terminals is used to connect display unit;
Second video output terminals is used to connect said display unit;
First resistance is connected between said first video output terminals and the earth terminal;
Second resistance is connected between said second video output terminals and the earth terminal; And
Control circuit comprises:
The digital video signal generator is used to export index signal between first digital video signal, second digital video signal and clear area;
First digital-analog convertor; Be used to receive said first digital video signal; And first control end reception control signal through disposing; And enable said first digital-analog convertor through said control signal, convert said first digital video signal into first analog video signal, and transmit said first analog video signal to said first video output terminals; Perhaps, forbid said first digital-analog convertor, stop to convert said first digital video signal into said first analog video signal through said control signal;
Second digital-analog convertor; Be used to receive said second digital video signal; And through the configuration second control end receive said control signal; And enable said second digital-analog convertor through said control signal, convert said second digital video signal into second analog video signal, and transmit said second mode video signal to said second video output terminals; Perhaps forbid said second digital-analog convertor, stop said second digital video signal is stopped to convert into said second analog video signal through said control signal; And
Detector; Be used to receive said first analog video signal and said second analog video signal; When index signal is moved between sense cycle and said clear area; Export said control signal; And enable said first digital-analog convertor or said second digital-analog convertor with said control signal, will said first analog video signal or said second digital-analog convertor and critical voltage compare and obtain consequential signal, and judge the perhaps transmission state of said second analog video signal and said display unit of said first analog video signal through said consequential signal;
Wherein, When said first analog video signal or said second analog video signal can't transfer to said display unit; Said detector utilizes said control signal to forbid said first digital-analog convertor or said second digital-analog convertor; And, when said first analog video signal transfers to said display unit, utilize said control signal to keep and enable said first digital-analog convertor or said second digital-analog convertor.
The present invention proposes the connection detector and the detection method thereof of vision signal in a kind of multimedia device; Utilize video DAC to be current source; And the voltage when not having the TV load is the characteristic of the twice when the TV load is arranged, and most voltage is fixing in the vertical blank interval simultaneously, through interior change in voltage between the detection of vertical clear area; Both can judge whether the connection load; Also can the detection at any time user whether change the annexation between vision signal and the television set, thereby open and close corresponding DAC, reach the multimedia device purpose of power saving.
Description of drawings
Fig. 1 is the structural representation of multimedia device among the present invention.
Fig. 2 is the sketch map of vision signal among the present invention.
Fig. 3 is for concerning sketch map between picture frame and the sense cycle in the vision signal among the present invention.
Fig. 4 is the joint detection method flow diagram of vision signal in the multimedia device among the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme provided by the invention is done further to introduce.
As shown in Figure 1, multimedia device 100 of the present invention comprises video output terminals 102,104,106,108, control circuit 150, with a plurality of resistance R cvbs, Rv, Ru, Ry.Said multimedia device 100 can export the CVBS signal simultaneously and YUV signal supplies the user to utilize holding wire to be connected to television set 200.As shown in Figure 1, said television set 200 comprises Video Decoder (video decoder) 210 and receives resistance R r that this reception resistance connects Video Decoder 210 inputs and earth terminal respectively.The user utilizes holding wire to be connected in video output terminals 102 in order to receiving the CVBS signal, and the Video Decoder 210 CVBS signal that can receive and decode.The reception resistance R r of the resistance R cvbs in the multimedia device 100, Rv, Ru, Ry and television set 200 is 75 ohm (ohm) in the present invention.
Further; Control circuit 150 exportable CVBS signal and YUV signals in the multimedia device 100; And video output terminals 102,104,106,108 outputs; And resistance R cvbs, Rv, Ru, Ry one end ground connection, the other end is connected in corresponding video output terminals 102,104,106,108 successively.Said control circuit 150 comprises: digital video signal generator 170, detector 160, first pattern/digital quantizer (DAC_1) 151, second pattern/digital quantizer (DAC_2) 152, the three-mode/digital quantizer (DAC_3) 153, the four-mode/digital quantizer (DAC_4) 154.
Wherein said digital video signal generator 170 comprises CVBS engine 172 and YUV engine 174.Said CVBS engine 172 respectively has a control end C5, C6 with said YUV engine 174.When the control end C5 of CVBS engine 172 opened, the CVBS signal (CVBS_D) that CVBS engine 172 can be exported numeral was to first digital-analog convertor (DAC_1) 151.In like manner, when the control end C6 of YUV engine 174 opened, the Y-signal (Y_D) that YUV engine 174 can be exported numeral was to the 4th digital-analog convertor (DAC_4) 154; The U signal (U_D) of numeral is to the 3rd digital-analog convertor (DAC_3) 153; And the V signal (V_D) of numeral is to second digital-analog convertor (DAC_2) 152.When CVBS engine 172 or YUV engine 174 are closed, will can not export the Y-signal (Y_D) of digital CVBS signal (CVBS_D), numeral, the U signal (U_D) of numeral, the V signal (V_D) of numeral respectively.
Wherein first digital-analog convertor (DAC_1) 151, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, the 4th digital-analog convertor (DAC_4) 154 all have control end (C1～C4), controlled by control signal E respectively.For instance, when control signal E opened first digital-analog convertor (DAC_1) 151, first digital-analog convertor (DAC_1) 151 was with the CVBS conversion of signals of the numeral CVBS signal for simulation; Otherwise when control signal E closed first digital-analog convertor (DAC_1) 151,151 of first digital-analog convertors (DAC_1) can't be with the CVBS conversion of signals of the numeral CVBS signal for simulation.
In the embodiments of the invention, the detector 160 in the control circuit 150 comprises: switch control unit 162, multiplex's multiplexer 166, comparator 164.Switch control unit 162 selects signal S to be transferred to multiplex's multiplexer 166 from index signal B between digital signal generator reception clear area and generation; Multiplex's multiplexer 166 inputs receive CVBS signal and Y-signal, and according to selecting signal S to produce CVBS signal or Y-signal by multiplex's multiplexer 166 outputs; Comparator 164 inputs connect a multiplex's multiplexer output terminal and a critical voltage (Vth) respectively, and 162 generation control signal E are transferred to first digital-analog convertor (DAC_1) 151, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, the 4th digital-analog convertor (DAC_4) 154, CVBS engine 172 and YUV engine 174 thereby the signal that bears results is transferred to switch control unit.Annexation with multimedia device 100 and television set 200 is an example; The control signal E of detector 160 can open first digital-analog convertor (DAC_1) 151 with CVBS engine 172 and close YUV engine 174, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, and the 4th digital-analog convertor (DAC_4) 154.
As shown in Figure 2, in CVBS signal and the Y-signal each picture frame (frame) comprise between the viewing area (displaying interval) and vertical blank interval (vertical blacking interval, VBI).In the vertical blank interval, occur successively blank and cycle such as gradeizations (blanking & equalization period), zigzag cycle (serration period), blank and etc. the change cycle (blanking & equalization period).And index signal B when action between the clear area, the expression vision signal in the vertical blank interval, between the viewing area outside the vertical blank interval then expression be failure to actuate.
According to embodiments of the invention, detector 160 can periodically be enabled, and for example in 2 seconds, is enabled 0.1 second, and can be considered a sense cycle in 0.1 second.In the sense cycle of detector 160, switch control unit 162 utilizes control signal E to open CVBS engine 172, YUV engine 174, first digital-analog convertor (DAC_1) 151, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, the 4th digital-analog convertor (DAC_4) 154.
In sense cycle, if detector 160 receives index signal B between the clear area, switch control unit 162 can utilize selects signal S with CVBS signal or Y-signal input comparator 164.And comparator 164 compares vision signal of importing (CVBS signal or Y-signal) and critical voltage (Vth); The signal that bears results is transferred to switch control unit 162, makes switch control unit 162 according to this consequential signal control signal E is transferred to first digital-analog convertor (DAC_1) 151, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, the 4th digital-analog convertor (DAC_4) 154.Certainly, critical voltage (Vth) can be set between 300mV and the 600mV, for example 450mV.
Annexation with multimedia device 100 and television set 200 is that example describes.
Detector learns that in sense cycle CVBS voltage of signals amplitude is 300mV; The voltage amplitude of Y-signal is 600mV; Make switch control unit 162 confirm that television set 200 is receiving the CVBS signal; Then control signal E can open first digital-analog convertor (DAC_1) 151 with CVBS engine 172 and close YUV engine 174, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, and the 4th digital-analog convertor (DAC_4) 154.At this moment, control circuit 150 stops to export YUV signal, and output CVBS signal.
When the user pulls out the line between video output terminals 102 and the television set 200; And when changing by video output terminals 104,106,108 connection YUV signal to television sets 200; Detector 160 learns that in sense cycle CVBS voltage of signals amplitude is 600mV and the voltage amplitude of Y-signal is 300mV; Switch control unit 162 confirms that television set 200 is receiving YUV signal; Therefore control signal E can close CVBS engine 172 and first digital-analog convertor (DAC_1) 151, and opens YUV engine 174, second digital-analog convertor (DAC_2) 152, the 3rd digital-analog convertor (DAC_3) 153, the 4th digital-analog convertor (DAC_4) 154.At this moment, control circuit 150 promptly stops to export the CVBS signal, and the output YUV signal.
Above-mentioned multimedia device 100 is an example with CVBS signal and YUV signal only, and the present invention is not limited thereto scope certainly.Multimedia device more can be exported CVBS signal, S-Video signal, YUV signal and rgb signal simultaneously.And after the detector 160 increase multiplexer input quantity in the multimedia device; Just can receive in Y-signal in CVBS signal, the S-Video signal, the Y-signal in the YUV signal, the rgb signal and have the CVBS signal in synchronous signal (for example G signal) and the SCART interface; And when vertical blank is interval, carry out voltage amplitude relatively; And then the corresponding DAC of control get final product, so repeats no more.
Certainly, the present invention more can be applicable to the situation that multimedia device only has a video output terminals and exports single analog video signal.When multimedia device only had a video output terminals, the detector circuit of first figure can omit selected signal S and multiplex's multiplexer 166, and the direct input comparator 164 of analog video signal is got final product.
Introduce the relation between the picture frame and sense cycle in the vision signal below, as shown in Figure 3:
Each triangle is represented the picture frame (frame) in the vision signal, and the leading portion of each picture frame is vertical blank interval (VBI).In the vision signal output procedure; Digital video signal generator 170 can be exported index signal B between the clear area constantly; And switch control unit 162 just carries out the detection of vision signal only when sense cycle, and then opens or close corresponding DAC and video engine.
The method of carrying out joint detection in the face of vision signal in the multimedia device of the present invention is down introduced, and wherein switch control unit 162 only detects one of them vision signal in this multimedia device 100 in single sense cycle, and detailed process is as shown in Figure 4:
After sense cycle began (step S400), the selection signal S that signal " 0 " is provided opened first digital-analog convertor (DAC_1) 151 and CVBS engine 172 (step S410) to multiplex's multiplexer 166 and control signal E.Then, confirm whether to occur vertical blank interval (step S420) according to index signal B between the clear area of digital video signal generator 170 outputs.If the vertical blank interval do not occur, maintain step S420; If vertical blank is interval, obtain consequential signal (step S430).
Because multiplex's multiplexer 166 output CVBS signals, and CVBS voltage of signals amplitude subcritical voltage (Vth), so the consequential signal of comparator 164 output signals " 0 ".This consequential signal indication CVBS signal is passed to television set (step S440), therefore continues to open first digital-analog convertor (DAC_1) 151 and CVBS engine 172 (step S460).Afterwards, will select signal S to change into signal " 1 " (step S470), and end (step S480).
When next sense cycle began (step S400), the selection signal S that signal " 1 " is provided opened second digital-analog convertor (DAC_2) 152 and YUV engine 174 (step S410) to multiplex's multiplexer 166 and control signal E.Then, confirm whether to occur vertical blank interval (step S420) according to index signal B between the clear area of digital video signal generator 170 outputs.If do not go out a vertical blank interval, maintain step S420; If vertical blank is interval, obtain consequential signal (step S430).
Because multiplex's multiplexer 166 output Y-signals, and the voltage amplitude of Y-signal is higher than critical voltage (Vth), so the consequential signal of comparator 164 output signals " 1 ".This consequential signal indication Y-signal is not passed to television set (step S440), therefore closes second digital-analog convertor (DAC_2) 152 and YUV engine 174 once again, will select signal S to change into signal " 0 " (step S470) again, and end (step S480).
Otherwise; If comparator 164 output signals " 0 " consequential signal indication Y-signal be passed to television set, then control signal E keeps and opens second digital-analog convertor (DAC_2) 152 with YUV engine 174 and open the 3rd digital-analog convertor (DAC_3) 153, the 4th digital-analog convertor (DAC_4) 154 (step S460) again.
When the user pulls out the line between video output terminals 102 and the television set 200; And when changing by video output terminals 104,106,108 connection YUV signal to television sets 200; Detector 160 can learn that CVBS voltage of signals amplitude is 600mV at least two sense cycle; And the voltage amplitude of Y-signal is 300mV, and then judges whether to open or close corresponding DAC and video engine.
Moreover; In order to prevent that multimedia device from producing erroneous judgement; Before step S450 closed corresponding DAC, the YUV signal that the user shows on television set according to vision signal was not passed to the information of television set, utilizes the button of remote controller or multimedia device to confirm.
The present invention proposes the connection detector and the detection method thereof of vision signal in a kind of multimedia device; Utilize video DAC to be current source; And the voltage when not having the TV load is the characteristic of the twice when the TV load is arranged, and most voltage is fixing in the vertical blank interval simultaneously, through interior change in voltage between the detection of vertical clear area; Both can judge whether the connection load; Also can the detection at any time user whether change the annexation between vision signal and the television set, thereby open and close corresponding DAC, reach the multimedia device purpose of power saving.
One of ordinary skill in the art will appreciate that all or part of step that realizes the foregoing description is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; This program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If said integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the described protection range of claim.
Claims (12)
1. a multimedia device is characterized in that, comprising:
Video output terminals is used to connect display unit;
Resistance is connected between said video output terminals and the earth terminal; And
Control circuit comprises:
The digital video signal generator is used for index signal between output digital video signal and clear area;
Digital-analog convertor; Be used to receive said digital video signal; And control end reception control signal through disposing; Adopt said control signal to enable said digital-analog convertor, convert said digital video signal into analog video signal, and said analog video signal is transferred to said video output terminals; And
Detector; Be used to receive said analog video signal, when index signal is moved between sense cycle and said clear area, export said control signal; And, enable said digital-analog convertor through said control signal according to the transmission state of said analog video signal and this display unit; When said analog video signal can't transfer to said display unit; Said detector utilizes said control signal to forbid said digital-analog convertor; And; When said analog video signal transfers to said display unit, utilize said control signal to keep and enable said digital-analog convertor;
Wherein, the transmission state of said analog video signal and said display unit is to confirm according to said analog video signal and the relatively back consequential signal that generates of critical voltage.
2. multimedia device according to claim 1 is characterized in that, said detector is enabled when this sense cycle, comprising:
Switch control unit is used to receive index signal between said clear area, and exports said control signal;
Comparator is used to receive said analog video signal and said critical voltage, and compares this consequential signal of generation;
Wherein, when said analog video signal during greater than said critical voltage, said analog video signal can't transfer to said display unit; When said analog video signal during less than this critical voltage, said analog video signal transfers to said display unit.
3. multimedia device according to claim 1; It is characterized in that said analog video signal is the luminance signal, the luminance signal in the light tone composition signal, the synchronous composition signal in the RGB composition signal in composite video broadcast singal, the light tone separation signal.
4. multimedia device according to claim 1 is characterized in that, said multimedia device is electronic game machine or DVD player, and said display unit is a television set.
5. multimedia device according to claim 1 is characterized in that, said digital video signal generator is exported said blank index signal when the vertical blank of said analog video signal is interval.
6. multimedia device according to claim 1 is characterized in that, said digital video signal generator also comprises:
Video engine is used for receiving said control signal through the control end of configuration, and enables said video engine through said control signal, makes said video engine export said digital video signal; Perhaps, forbid said video engine, make said video engine stop to export said digital video signal.
7. a multimedia device is characterized in that, comprising:
First video output terminals is used to connect display unit;
Second video output terminals is used to connect said display unit;
First resistance is connected between said first video output terminals and the earth terminal;
Second resistance is connected between said second video output terminals and the earth terminal; And
Control circuit comprises:
The digital video signal generator is used to export index signal between first digital video signal, second digital video signal and clear area;
First digital-analog convertor; Be used to receive said first digital video signal; And first control end reception control signal through disposing; And enable said first digital-analog convertor through said control signal, convert said first digital video signal into first analog video signal, and transmit said first analog video signal to said first video output terminals; Perhaps, forbid said first digital-analog convertor, stop to convert said first digital video signal into said first analog video signal through said control signal;
Second digital-analog convertor; Be used to receive said second digital video signal; And through the configuration second control end receive said control signal; And enable said second digital-analog convertor through said control signal, convert said second digital video signal into second analog video signal, and transmit said second mode video signal to said second video output terminals; Perhaps forbid said second digital-analog convertor, stop said second digital video signal is stopped to convert into said second analog video signal through said control signal; And
Detector; Be used to receive said first analog video signal and said second analog video signal; When index signal is moved between sense cycle and said clear area; Export said control signal; And enable said first digital-analog convertor or said second digital-analog convertor with said control signal, will said first analog video signal or said second digital-analog convertor and critical voltage compare and obtain consequential signal, and judge the perhaps transmission state of said second analog video signal and said display unit of said first analog video signal through said consequential signal;
Wherein, When said first analog video signal or said second analog video signal can't transfer to said display unit; Said detector utilizes said control signal to forbid said first digital-analog convertor or said second digital-analog convertor; And, when said first analog video signal transfers to said display unit, utilize said control signal to keep and enable said first digital-analog convertor or said second digital-analog convertor.
8. multimedia device according to claim 7 wherein, when said detection is enabled when said sense cycle, comprising:
Switch control unit is used for when receiving between said clear area index signal, and signal and said control signal are selected in output;
Multiplex's multiplexer; Be used for receiving said first analog video signal and said second analog video signal respectively through at least two inputs of configuration; Selecting side through configuration receives said selection signal; According to said selection signal, export said first analog video signal or said second analog video signal; And
Comparator is used to receive the analog video signal of said multiplex's multiplexer output, and the voltage and the said critical voltage of the analog video signal of said multiplex's multiplexer output compared, and produces said consequential signal according to comparative result;
Wherein, when the voltage of the analog video signal of said multiplex's multiplexer output during greater than said critical voltage, the analog video signal of said multiplex's multiplexer output can't transfer to said display unit; When the voltage of the analog video signal of said multiplex's multiplexer output during less than said critical voltage, the analog video signal of said multiplex's multiplexer output transfers to said display unit.
9. multimedia device according to claim 7; It is characterized in that the analog video signal of said multiplex's multiplexer output is luminance signal, the luminance signal in the light tone composition signal or the synchronous composition signal in the RGB composition signal in composite video broadcast singal, the light tone separation signal.
10. multimedia device according to claim 7 is characterized in that, said multimedia device is electronic game machine or DVD player, and said display unit is a television set.
11. multimedia device according to claim 7 is characterized in that, said digital video signal generator is exported said blank index signal when the vertical blank of said first analog video signal or said second analog video signal is interval.
12. multimedia device according to claim 7 is characterized in that, said digital video signal generator also comprises:
First video engine is used for receiving said control signal through the 3rd control end of configuration, and enables said first video engine through said control signal, makes said first video engine export said first digital video signal; Perhaps, forbid said first video engine, make said first video engine stop to export said first digital video signal through said control signal; And
Second video engine; Be used for receiving said control signal through the 4th control end of configuration; And enable said second video engine through said control signal, make said second video engine export said second digital video signal, perhaps; Forbid said second video engine through said control signal, make said second video engine stop to export said second digital video signal.
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| CN201010106621XA CN101778196B (en) | 2010-01-28 | 2010-01-28 | Multimedia device |
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| CN104284112A (en) * | 2013-07-05 | 2015-01-14 | 智原科技股份有限公司 | Video output system with load detecting device and detecting method thereof |
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