CN101212587A - Digital TV receiver and method adaptive to display parameters of display terminal - Google Patents
Digital TV receiver and method adaptive to display parameters of display terminal Download PDFInfo
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Abstract
The invention discloses a digital television receiving device which automatically adapts to a display parameter of a display terminal. The invention is used for receiving a transmission flow of the digital television signal and is connected with a display terminal. The invention comprises a video display format obtaining module used for obtaining video display format information from the digital television signal transmission flow; a processing module respectively connected with the video display format obtaining module and a display parameter reading module and used for arranging video display format information which matches with the display parameter according to the display parameter as well as outputting the digital television signal of the matched video display format information to the display terminal. The invention can cause a well matching between an outputting signal of the digital television receiving device and the display terminal.
Description
Technical field
The reception that the present invention relates to the digital television signal in the digital TV set-top box is handled and the output Display Technique, particularly relates to a kind of and automatic adaptive digital television receiving apparatus and the method for display parameters of display terminal.
Background technology
Be illustrated in figure 1 as digital television receiving apparatus and digital television receiver connection diagram.Digital television receiving apparatus, promptly set-top box 101 is connected with digital television receiver (display terminal) 102 by digital interface or analog interface.This digital interface comprises (HDMI/DVI, VGA port), and this analog interface comprises (VGA/YPbPr).Set-top box receives, after demodulation, decoding, demonstration handle, exports display terminal to by numeral or analog interface digital television signal.
And comprise different video display format (Video formats) information in the digital television signal, main relevant display parameters have:
Image resolution ratio: for example 1980 * 1080,1280 * 720,720 * 576,720 * 480 etc.;
Scanning field frequency: 50Hz for example, 60Hz etc.;
Show the ratio of width to height (also claiming aspect ration): for example 4: 3,16: 9 etc.;
Scan mode is divided into lines by line scan (P) and interlacing scan (I).
This display terminal can be for example for selecting flat-panel monitor or panel TV such as LCD/PDP for use, perhaps other have the device that display and television reception show two kinds of functions.They have following display format characteristics usually: the physical resolution form has:
Full?HDTV 1980×1080
WXGA 1366×720
XGA 1280×720
SVGA 800×600
VGA 640×480；
Field frequency can be supported 50Hz or 60Hz;
Show that the ratio of width to height is 4: 3 or 16: 9;
Normally continuous sweep mode of scan mode (P).
But when display terminal 102 shows input signal from digital television receiving apparatus 101, unmatched phenomenon might appear, as the incompatible aspect of display parameters mistakes such as field synchronization mistake and display resolution or definition, demonstration the ratio of width to height, scan modes.Generation for fear of this mistake phenomenon, digital television receiving apparatus need obtain the display properties parameter of display terminal earlier, according to this parameter the video display format information of image in the digital television signal is carried out necessary processing, with the signal of output coupling to display terminal.Digital television receiving apparatus has some video signal output interfaces, as CVBS (S-Video), VGA (RGB), YPbPr, DVI/HDMI etc., can realize interoperability with display terminal by the DDC2B/EDID data channel protocol in the interfaces such as VGA (RGB) or DVI/HDMI, finish it and show adaption function automatically with same interface.
DDC2B/EDID is the VESA standard, is used for automatic coupling and compatible identification between the coupled display display parameters of computer (PC) host computer system.EDID (Extended DisplayIdentification Data) is the english abbreviation of expanded display recognition data, and these data contain the video attribute parameter, as supplier information, maximum image resolution, scanning frequency (OK /) scope etc.; Can be implemented in the exchanges data between main frame (PC) and display by DDC (Display Data Channel) data channel, what DDC2B represented is the data channel that is used for two-way exchange.
Under the incompatible situation of digital television receiving apparatus output signal and display parameters of display terminal, blank screen or other abnormal demonstration phenomenon generation may occur, the present invention mainly is that making between device output and the display terminal of designing at the solution of this problem can obtain good coupling.
Summary of the invention
Problem to be solved by this invention is, provides a kind of and automatic adaptive digital television receiving apparatus and the method for display parameters of display terminal, occurs to avoid the incompatible situation of digital television receiving apparatus output signal and display parameters of display terminal.
For achieving the above object, the invention discloses a kind of and the automatic adaptive digital television receiving apparatus of display parameters of display terminal, be used for the receiving digital television signal transport stream, and be connected, comprising with display terminal:
One video display format acquisition module is used for extracting video display format information from described digital television signal transport stream;
One display parameters read module is used for from described display terminal reading displayed parameter;
One processing module, be connected with described video display format acquisition module and described display parameters read module respectively, be used for according to described display parameters, set the video display format information of mating with described display parameters, the digital television signal that will possess the video display format information of described coupling exports display terminal to.
Described video display format information comprises resolution, field frequency, the ratio of width to height, scan type.
Described display parameters comprise resolution, field frequency, the ratio of width to height.
Described processing module further comprises a resolution processes module, can the ultimate resolution that be used for judging described display parameters support the resolution in the described video display format information, if do not support, and the resolution in the described video display format information of down conversion, if support, do not do conversion.
Comprise also in the described processing unit that a screen shows module, is used to point out described video display format information of user and described display parameters not to match.
Described processing module comprises a field frequency processing module, can the field frequency that be used for judging described display parameters support the field frequency in the described video display format information, if do not support, adjust the field frequency in the described video display format information, if support, do not adjust,, call a screen and show module if still do not support after adjusting.
Described processing module further comprises the ratio of width to height processing module, can the ratio of width to height that be used for judging described display parameters support the ratio of width to height in the described video display format information, if do not support, adjust the ratio of width to height in the described video display format information, if support, do not adjust,, call a screen and show module if still do not support after adjusting.
Described processing module comprises that also one shows the processing mode module, is used to show described display parameters and described video display format information, and manually described video display format information is adjusted.
Described device comprises output interface, is used for being connected with described display terminal.
The invention also discloses a kind of and the automatic adaptive digital television receiving method of display parameters of display terminal, be used for receiving and handling the digital television signal transport stream, described method comprises:
Video display format information read step reads video display format information from the digital television signal transport stream;
The display parameters read step is from described display terminal reading displayed parameter;
Selected step, according to described display parameters, the selected described video display format information that is complementary with described display parameters;
The output step exports described display terminal to and shows.
The present invention can make between digital television receiving apparatus output signal and the display terminal can obtain good coupling.
Description of drawings
Figure 1 shows that digital television receiving apparatus and digital television receiver connection diagram;
Figure 2 shows that the structural representation of device of the present invention;
Figure 3 shows that the structural representation of the present invention's one specific embodiment;
Figure 4 shows that the graphical display interface schematic diagram that shows in the display terminal under the manual mode;
Figure 5 shows that comparison process flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the specific implementation process that digital television receiving apparatus output signal of the present invention and display parameters of display terminal are mated is elaborated.
The present invention mainly is a kind of method or the device that mates at digital television receiving apparatus output signal and display parameters of display terminal.This device obtains relevant image/video display format information in advance from the digital television signal transport stream, contrast with the display parameters that read from display terminal, automatically discern the similarities and differences, select the display parameters (resolution/scan mode of coupling, field frequency and the ratio of width to height etc.), after video format (Videoformats) is handled conversion, the digital television signal of output can be mated automatically with display parameters of display terminal.This device also provides a kind of manual manipulation mode, that is, the image/video display format information that will obtain from the digital television signal transport stream together shows together with display parameters of display terminal, allows the user manually select as required.If image/video display format information and display parameters of display terminal can't compatible contexts, apparent to shield (OSD) mode of installing is notified the user.
See also Fig. 2 and be a kind of and the display parameters of display terminal of the present invention structural representation of adaptive digital television receiving apparatus automatically.
As shown in the figure, digital television receiving apparatus 200 is connected with display terminal 210.Wherein, comprise video display format acquisition module 201, processing module 202, display parameters read module 203 in the digital television receiving apparatus 200.Further comprise in the processing module 202: video format compares with processing module 2021, shows processing mode module 2022.Video display format acquisition module 201 receiving digital television signal transport stream, and therefrom obtain the image/video display format information, send processing module 202 to.Display parameters read module 203 is connected with display terminal 210, and reading displayed parameter from display terminal sends processing module 202 to.Processing module 202 is handled the data TV signal with reference to display parameters of display terminal, and the data after the processing directly transfer to display terminal 210.
Video display format acquisition module 201 can for example be a Video Decoder (Video Decoder).This Video Decoder is used for obtaining video display format information the service information list (SI) of video sequence head (Sequence Header) from the digital television signal transport stream or digital television signal transport stream (TS stream).This video display format information comprises: parameters such as resolution, demonstration the ratio of width to height, field frequency, scan mode.And the major parameter that display parameters read module 203 obtains from display terminal 210 also comprises physical resolution, line frequency/field frequency scope, shows the ratio of width to height etc.That is, video display format acquisition module 201 is corresponding with the parameter type that display parameters read module 203 is read.
This processing module 202 is responsible for comparing the difference between video display format information and the display parameters of display terminal and digital television signal is carried out the format conversion of the best.
Show that wherein processing mode module 2021 is used for by manual mode, without the automatic comparison of video format comparison and processing module 2021 and processing and directly the video display format information of the digital television signal of current input and the display parameters of display terminal are exported on the screen simultaneously, the user can select suitable video format according to actual conditions.That is, the user is according to the display parameters of display terminal, manually selects to export to the video display format information of the digital television signal of display terminal, the situation appearance that the display terminal that causes can't show because display parameters do not match to avoid.
If user and non-selected manual mode then can be by the video display format information of the suitable digital television signal of system's automatic setting, to guarantee the display effect of this digital television signal in display terminal.
Wherein, show that resolution processes module in the processing mode module 2022 judges whether the ultimate resolution of display terminal can support the image resolution ratio of the digital television signal that receives, if of course, digital television receiving apparatus is directly exported from interface by original (native) digital TV image resolution.When for example current digital TV image resolution is 720 * 576i, output 720 * 576i format signal; When being 1980 * 1080i, output 1920 * 1080i format signal.When the ultimate resolution of display terminal is not supported the image resolution ratio of current digital television signal, show that processing mode module 2022 is by its included video format conversion module, carry out form down conversion (down-convert), for example be transformed into 1980 * 1080i, or be transformed into 720 * 576i from original 1980 * 1080i from original 1980 * 1080P.
Because display terminal is supported 50Hz or 60Hz field frequency, but the video display format information in the digital television signal may comprise multiple field frequency, therefore show that the field frequency processing module in the processing mode module 2022 need judge whether the field frequency of display terminal supports 50Hz, if do not support, the digital television signal of 50Hz field frequency is converted to the digital television signal of 60Hz field frequency by the video format conversion module.When digital television signal and display terminal can't mate aspect field frequency, show mode with screen and notify the user.
Show the ratio of width to height processing module in the processing mode module 2022 under the display terminal screen width high ratio is 16: 9 conditions, digital television receiving apparatus keeps the ratio of width to height output of original image constant; Under the display terminal screen width high ratio was 4: 3 conditions, the ratio of width to height of image was 16: 9 o'clock in the current digital television signal, and digital television receiving apparatus is the image output of 4: 3 the ratio of width to height by the video format conversion module with the image transitions of 16: 9 the ratio of width to height; When there was other the ratio of width to height in image in digital television signal, device showed mode with screen and notifies this display terminal of user not support the ratio of width to height of current input image.
Following with reference to embodiment, describe implementation procedure of the present invention in detail.
See also the structural representation that Figure 3 shows that the present invention's one specific embodiment.Digital television signal is exported the digital television signal transport stream through digital television receiving apparatus 300 built-in telegon and demodulators 301, and system decoder 302 receives these digital television signal transport stream and it is filtered.System decoder 302 filters out PSI (program-related information table) and SI table information, and it is saved among the SDRAM.This moment, CPU resolved institute's preservation information, and according to the selection of user to digital television program, corresponding video was wrapped substantially (Video PES) and transferred to Video Decoder 303 and finish decoding work.
Subsequently, obtain video display format information, its process specifically comprises: CPU moves a video display format and obtains software, read the current video display format information of handling in the preferential video sequence header register from Video Decoder 303, this information comprises parameters such as resolution, scan mode, field frequency, the ratio of width to height; When containing more complete SI table information in the transport stream, also can obtain same video format information to the parsing of the current business video component descriptors (component descriptor) in this table by the video display format acquisition module.
Digital television receiving apparatus has the DDC2B/EDID agreement by VGA, DVI/HDMI etc. output interface 306 is connected with the corresponding input interface of display terminal, display parameter data passage (DDC2B/EDID) is realized by the I2C bus mode, display parameters are stored in the display terminal internal electrical erasable memory (EEPROM), and digital television receiving apparatus is realized data communication with display terminal by data channel processor 304.CPU operation display parameters reading software reads and stores the display parameters of display terminal by control interface 306 with control data channel processor 304.
By the way, digital television receiving apparatus has obtained the relevant display parameter information of digital television signal transport stream and display terminal.And which kind of mode specifically carrying out the contrast of above-mentioned two kinds of display parameter information by, the user can select voluntarily.In device menu (Menu), be provided with one and show the processing mode setting option, two kinds of selection modes, manual mode and automated manners are provided.Manual mode is promptly directly exported manual mode graphical display interface shown in Figure 4 400 to display terminal, the display parameters that wherein comprise input signal and display terminal respectively, the user can select the video format parameter of the digital television receiving apparatus of coupling by these information with the reference display parameters of display terminal.Automated manner does not need the user manually to select, but the comparative figures television transmission is flowed in the signal and the relevant display parameter information of display terminal voluntarily, mates automatically, and conversion accordingly or output.
The comparative approach that this is concrete sees also shown in Figure 5ly, is the comparison process flow chart.CPU at first judges resolution and sweep parameter, and can the ultimate resolution of promptly judging display terminal support the image resolution ratio (step 501) of the digital television signal that receives, if can, then keep original image resolution ratio constant (step 502); If cannot, promptly when the ultimate resolution of showing display terminal is not supported the image resolution ratio of the digital television signal that receives, by the video format converter 305 that is connected with Video Decoder 303, carry out form down conversion (down-convert) automatically to the display format (step 503) that is fit to.For example be transformed into 1980 * 1080i, or be transformed into 720 * 576i from original 1980 * 1080i from original 1980 * 1080P.
Subsequently, judge whether the display terminal field frequency supports 50Hz (step 504),, keep original image field frequency output constant (step 505) if support, if do not support, video format converter 305 is converted to the picture signal of 50Hz field frequency the picture signal (step 506) of 60Hz field frequency automatically.Further judge after the conversion field frequency whether with the field frequency coupling (step 507) of display terminal, if still do not match, notify the user (step 508) to shield the mode of showing, if coupling, further judge whether the ratio of width to height of display terminal screen is 16: 9 (step 509), if, the ratio of width to height of original image remain unchanged (step 510), if not, judge whether the ratio of width to height of display terminal screen is whether 4: 3 synchronous signal aspect ratios are 16: 9 (step 511).If, signal pattern is carried out 16: 9 to 4: 3 conversion (step 512), relatively flow process finishes.If not, judge further whether signal pattern exists other the ratio of width to height (step 513), if to shield the mode of showing user's (step 514) simultaneously, relatively flow process finishes, if not, directly finish.
Subsequently, output is above-mentioned through image information comparison process, that can mate with display terminal, on display terminal, show.
The present invention can obtain relevant image/video display format information in advance from digital TV transmission stream, contrast with the display properties parameter that reads from display terminal, automatically discern the similarities and differences, select suitable display parameters, after video format is handled conversion, output signal can be mated automatically with display parameters of display terminal.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
- One kind with the automatic adaptive digital television receiving apparatus of display parameters of display terminal, be used for the receiving digital television signal transport stream, and be connected with display terminal, it is characterized in that described device comprises:One video display format acquisition module is used for extracting video display format information from described digital television signal transport stream;One display parameters read module is used for from described display terminal reading displayed parameter;One processing module, be connected with described video display format acquisition module and described display parameters read module respectively, be used for according to described display parameters, set the video display format information of mating with described display parameters, the digital television signal that will possess the video display format information of described coupling exports described display terminal to.
- 2. device as claimed in claim 1 is characterized in that, described video display format information comprises resolution, field frequency, the ratio of width to height, scan type.
- 3. device as claimed in claim 1 or 2 is characterized in that described display parameters comprise resolution, field frequency, the ratio of width to height.
- 4. device as claimed in claim 3, it is characterized in that, described processing module further comprises a resolution processes module, can the ultimate resolution that be used for judging described display parameters support the resolution in the described video display format information, if do not support, resolution in the described video display format information of down conversion if support, is not done conversion.
- 5. as claim 1 or 4 described devices, it is characterized in that, comprise also in the described processing unit that a screen shows module, is used to point out described video display format information of user and described display parameters not to match.
- 6. device as claimed in claim 5, it is characterized in that, described processing module further comprises a field frequency processing module, can the field frequency that be used for judging described display parameters support the field frequency in the described video display format information, if do not support, adjusts the field frequency in the described video display format information, if support, do not adjust,, call a screen and show module if still do not support after adjusting.
- 7. device as claimed in claim 5, it is characterized in that, described processing module further comprises the ratio of width to height processing module, can the ratio of width to height that be used for judging described display parameters support the ratio of width to height in the described video display format information, if do not support, adjusts the ratio of width to height in the described video display format information, if support, do not adjust,, call a screen and show module if still do not support after adjusting.
- 8. device as claimed in claim 1 is characterized in that, described processing module comprises that also one shows the processing mode module, is used to show described display parameters and described video display format information, and manually described video display format information is adjusted.
- 9. device as claimed in claim 1 is characterized in that described device comprises output interface, is used for being connected with described display terminal.
- One kind with the automatic adaptive digital television receiving method of display parameters of display terminal, be used for receiving and handling the digital television signal transport stream, it is characterized in that described method comprises:Video display format information read step reads video display format information from the digital television signal transport stream;The display parameters read step is from described display terminal reading displayed parameter;Selected step, according to described display parameters, the selected described video display format information that is complementary with described display parameters;The output step exports described display terminal to and shows.
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