CN102238384A - Multi-channel video decoder - Google Patents
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- CN102238384A CN102238384A CN2011101160930A CN201110116093A CN102238384A CN 102238384 A CN102238384 A CN 102238384A CN 2011101160930 A CN2011101160930 A CN 2011101160930A CN 201110116093 A CN201110116093 A CN 201110116093A CN 102238384 A CN102238384 A CN 102238384A
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Abstract
The invention relates to a multi-channel video processing technology and provides a multi-channel video decoder, which is connected to a plurality of movable video sources and one or a plurality of movable video displays. The video decoder comprises a multiplexer receiving the signal of the plurality of movable video channels, an analog-digital converter which converts the signal received from the multiplexer from an analog format to a digital format, an acquiring circuit detecting the signal characteristics of each movable video channel, and a rapid-switching controller which stores the rapid-switching parameter list of the signal characteristics of each movable video channel and controls the multiplexer and the acquiring circuit and uses the signal characteristics of each movable video channel. Accordingly, the plurality of movable video displays can display the video signals from the plurality of movable video sources simultaneously.
Description
[technical field]
The present invention relates to electronic applications, particularly relate to multi-channel video processing method and system and multi-channel video decoder.
[background technology]
In traditional multi-channel video system, a kind of application scheme is that a plurality of video source are connected on the Video Decoder jointly.Yet, in this application scheme, because the switch speed of described Video Decoder shows therefore have only one can be shown usually in a plurality of video source when being not enough to support a plurality of video source.For instance, for a traditional tv, spectators can only select in the input channel to go to watch, such as select one from digital video recorder, DVD player, CATV set-top-box or other input sources.A scheme that addresses this problem is for each input video passage a special Video Decoder to be set.The shortcoming of this scheme is to remove to hold extra Video Decoder by bigger circuit board, and this will increase the size and the cost of traditional multi-channel video system.
Therefore, be necessary to propose improved multi-channel video scheme and overcome the problems referred to above.
[summary of the invention]
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit avoiding the making purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used to limit the scope of the invention.
One of purpose of the present invention is to provide a kind of Video Decoder, and it can support a plurality of motion videos source and a plurality of motion video display.
Two of purpose of the present invention is to provide a kind of multi-channel video processing method, and it can support a plurality of motion videos source and a plurality of motion video display.
Three of purpose of the present invention is to provide a kind of multi-channel video treatment system, and it can realize that a plurality of motion video displays show the vision signal from a plurality of motion videos source simultaneously.
For achieving the above object, according to an aspect of the present invention, the invention provides a kind of Video Decoder, it comprises: multiplexer is used for receiving the signal of plural motion video passage; Analog to digital converter, the signal from analog format conversion that is used for receiving from described multiplexer is a number format; Acquisition cuicuit is used for detecting the signal characteristic of each motion video passage; Quick handoff parameter table is used for storing the signal characteristic of each motion video passage; With quick switch controller, be used for controlling described multiplexer and described acquisition cuicuit and use the signal characteristic that is stored in each the motion video passage in the described fast quick change parameter list.
In a further embodiment, described acquisition cuicuit comprises capable testing circuit, pattern detection circuit, clock recovery circuitry and automatic gain control circuit.
In a further embodiment, the signal characteristic of each motion video passage comprises: the gain-adjusted of horizontal synchronization data, vertical synchronization data, composite sync data, NTSC/PAL mode data, clock rate, clock skew and each motion video passage.
In a further embodiment, described quick switch controller comprises: the logic of the logic of control CCIR656 circuit and the read-write of the described quick handoff parameter table of control.The logic of wherein controlling the CCIR656 circuit comprises: produce the logic of the motion video opening code of outputting video signal and motion video end code and number revise the logic of the check digit of motion video opening code and motion video end code according to the respective channel of motion video passage.
In a further embodiment, described quick switch controller comprises: follow the tracks of the logic of each motion video passage and the logic of following the tracks of each motion video passage in the pre-programmed mode in a looping fashion.The logic of wherein following the tracks of each motion video passage comprises: detect switching of handling for the first time into the logic of motion video passage; Detection with reprocessing switch into the logic of motion video passage; With the logic that when in described motion video passage, not detecting signal, produces timeout signal.Further, the logic of following the tracks of each motion video passage further comprises: according to the logic of the frame of predetermined quantity being handled the signal of described motion video passage.
In a further embodiment, described Video Decoder further comprises: subcarrier regenerator, y/c separation circuit, UV demodulator circuit, color space converting circuit and CCIR656 circuit.
According to another aspect of the present invention, the invention provides a kind of multi-channel video processing method, it comprises: utilize multiplexer to receive the signal of plural motion video passage; Utilize analog to digital converter to be number format from the signal from analog format conversion that described multiplexer receives; Utilize acquisition cuicuit to detect the signal characteristic of each motion video passage; The signal characteristic of each motion video passage of storage in quick handoff parameter table; Make the signal characteristic that is stored in each the motion video passage in the described fast quick change parameter list with described multiplexer of control and described acquisition cuicuit profit.
In a further embodiment, detect the signal characteristic of each motion video passage: the row bound that detects described signal; Detect the pattern of described signal; Detect the clock rate and the deviation of described signal; Detect the gain-adjusted of described signal.
In a further embodiment, the signal characteristic of each motion video passage comprises: the gain-adjusted of horizontal synchronization data, vertical synchronization data, composite sync data, NTSC/PAL mode data, clock rate, clock skew and each motion video passage.
In a further embodiment, described control also comprises: control CCIR656 circuit produces outputting video signal; Read-write with the described quick handoff parameter table of control.Wherein, controlling described CCIR656 circuit comprises: produce the motion video opening code of outputting video signal and motion video end code and number revise the check digit of motion video opening code and motion video end code according to the respective channel of motion video passage.
In a further embodiment, described control also comprises: follow the tracks of each motion video passage in a looping fashion and follow the tracks of each motion video passage in the pre-programmed mode.Wherein following the tracks of each motion video passage comprises: detect switching of handling for the first time into the motion video passage; Detection with reprocessing switch into the motion video passage; With generation timeout signal when in described motion video passage, not detecting signal.Further, the logic of following the tracks of each motion video passage further comprises: according to the signal of the frame of predetermined quantity being handled described motion video passage.
According to a further aspect of the invention, the invention provides a kind of multi-channel video treatment system, it comprises: plural motion video source; The Video Decoder that is connected with described plural motion video source, it comprises: the multiplexer that receives the signal of described plural motion video passage, the signal from analog format conversion that will receive from described multiplexer is the analog to digital converter of number format, detect the acquisition cuicuit of the signal characteristic of each motion video passage, store each motion video passage signal characteristic quick handoff parameter table and control described multiplexer and described acquisition cuicuit utilization is stored in the quick switch controller of the signal characteristic of each the motion video passage in the described fast quick change parameter list; With the one or more motion video displays that are connected with described Video Decoder, wherein one or more motion video displays show the vision signal from described plural motion video source simultaneously.
In a further embodiment, described Video Decoder further comprises: subcarrier regenerator, y/c separation circuit, UV demodulator circuit, color space converting circuit and CCIR656 circuit.Wherein said CCIR656 circuit comprises: produce the motion video opening code of outputting video signal and the logic of motion video end code; Number revise the logic of the check digit of motion video opening code and motion video end code according to the respective channel of motion video passage; The logic that transfers to one or more motion video displays with motion video opening code and motion video end code with described modification.
Compared with prior art, can carry out hand-off process to incoming video signal in the Video Decoder among the present invention from a plurality of motion videos source, and the processed video signal can be switched the motion video display that exports correspondence to, thereby can realize supporting that a plurality of motion video displays show the function from the vision signal in a plurality of motion videos source simultaneously.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below.Wherein:
Fig. 1 is the system architecture diagram of the Video Decoder of a plurality of motion videos source of the support in the embodiment of the invention and a plurality of motion video displays;
Fig. 2 is the Video Decoder block diagram in one embodiment among Fig. 1;
Fig. 3 is the flow chart of the method for the tracking multi video channel in the embodiment of the invention;
Fig. 4 is the flow chart of the method for the video channel of tracking in the embodiment of the invention; With
Fig. 5 a to Fig. 5 b is the schematic diagram of the method for switching between two video channels in the embodiment of the invention.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical solution of the present invention by program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the present invention then may still can realize.Affiliated those of skill in the art use these descriptions herein and state that the others skilled in the art in affiliated field effectively introduce their work essence.In other words, be the purpose of the present invention of avoiding confusion, because the understanding easily of method of knowing and program, so they are not described in detail.
Alleged herein " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment." a plurality of " described in the present invention are meant two or more, and " plural number " is meant two or more.
Fig. 1 is the system architecture diagram of the Video Decoder of a plurality of motion videos of the support in embodiment of the invention source (active video sources) and a plurality of motion video display (active video displays).As shown in Figure 1, independent Video Decoder 108 is used for receiving the active video signal (activevideo signal) from a plurality of motion videos source, described a plurality of motion videos source also can be described as a plurality of video input channels (video inputchannel), such as motion video source 0, motion video source 1 and motion video source N-1, they are labeled as 102,104 and 106 respectively.Described Video Decoder 108 is to after handling from the incoming video signal of motion video source 102,104 and 106, export described vision signal to corresponding motion video display, such as motion video display 0, motion video display 1 and motion video display N-1, they are labeled as 110,112 and 114 respectively, and described a plurality of motion video displays also can be described as a plurality of video output channels (video output channel).
It should be noted that, described a plurality of video input channel and described a plurality of video output channel all are movable (active), that is to say, each motion video source (such as 102) is all to described Video Decoder 108 defeated input video frame, and each motion video display (such as 110) is all from described Video Decoder 108 receiver, video frames.In order to support a plurality of video channels, described Video Decoder 108 need switch (switching) fast with the obtaining of effective realization vision signal between the different video input channel, and these will be further described hereinafter.
In example as shown in Figure 1, the vision signal of CVBS form can be exported in described motion video source, wherein the full name of CVBS is: Composite Video Broadcast Signal or Composite VideoBlanking and Sync, it is a kind of standard that is widely used.Described Video Decoder can provide the vision signal of CCIR standard for each motion video display, and wherein CCIR is the standard that radio communication department (ITU-R) of International Telecommunications Union (International Telecommunication Union) formulates.
Fig. 2 is the Video Decoder block diagram in one embodiment among Fig. 1.In the present embodiment, described Video Decoder 108 comprises quick switch controller 202 and quick handoff parameter table 204.Described Video Decoder 108 comprises that further multiplexer 206, analog to digital converter 208, automatic gain control module (automatic gain control block is called for short AGC) 211, row detection module (line detect block) 212, mode detection module 214, clock recovery module 216, subcarrier recover module 218, Y/C separation module (or claiming comb filter) 220, UV demodulation module 222, color space conversion module 224 and CCIR656 module 226.Described multiplexer (MUX) 206 is used for receiving the input signal from a plurality of motion videos source.The vision signal that described CCIR656 module 226 is used for receiving outputs to a plurality of motion video displays.Described automatic gain control module 211, row detection module 212, mode detection module 214 and clock recovery module 216 also can be collectively referred to as acquisition module 210.Described quick handoff parameter table 204 can be realized by the computer storage of register, random-access memory (ram), read-only memory (ROM), electricallyerasable ROM (EEROM) (EEPROM) or other types.
Described multiplexer 206 is selected one from several analog or digital input signals, and selected input signal is carried out single line to front transfer handle.Described multiplexer can have n optionally input channel, and therefrom selects one as output.Described multiplexer 206 makes a plurality of input signals share a device or resource (such as an analog to digital converter 208) becomes possibility, and does not need for each input signal this device or resource to be set.
Described analog to digital converter (ADC) 208 is used for.Described digital output can be adopted different encoding schemes.Typically, described numeral is output as and imports proportional complement of two's two's complement (two ' s complement binarynumber).But other possibilities also can be arranged, such as exporting Gray code.
The resolution of described analog to digital converter 208 is illustrated in the quantity that can produce centrifugal pump in the whole analog-value range.With binary form storage, therefore can with position represent usually by described resolution for described centrifugal pump.Like this, the quantity or the exponent number (level) of described centrifugal pump are generally 2 exponential.For example, the analog to digital converter of 8 bit resolutions can be encoded to 2 with an analog input
8=256 numerical value of same order not.In different application, 8 centrifugal pump can be described from 0 to 255 scope (such as signless integer), also can describe from-128 to 127 scope (such as signed integer).Resolution also can be represented with volt (volt).Guarantee that the minimum change voltage that output code changes can be called least significant bit (least significant bit is called for short LSB).The resolution of described analog to digital converter can equal least significant bit voltage.The voltage resolution of described analog to digital converter equals the overall measurement voltage range divided by discrete voltage quantity at interval.
Described automatic gain control module 211 is Adaptable Systems, and it is used for controlling the gain of described Video Decoder 108.According to the average output signal level of feedback with the gain of input signal to suitable level.For example, control the gain adjustment of described capable detection module 212 according to the output signal of described capable detection module 212 and described mode detection module 214.
Described capable detection module 212 detects the row bound of described signal, such as horizontal blanking district Horizontalblank and vertical blanking district Vertical Blank, it can also detect the synchronizing information of described signal, such as horizontal-drive signal Hsync, vertical synchronizing signal VSync, composite synchronizing signal.
It is to adopt the coding of which kind of signal mode that described mode detection module 214 detects described vision signal, such as NTSC (National Television System Committee), PAL (Phase Alternating Line), SECAM (Sequential Color with Memory) or other patterns.
Clock jitter (clock offset) between described clock recovery module 216 identification senders (motion video source) and the recipient's (Video Decoder), and adjust with the described vision signal of accurate seizure.It should be noted that some digital data streams, particularly highspeed serial data stream are that the accompanying clock signal does not transmit.Described recipient produces clock according to approximate reference frequency, carries out phase alignment by the phase-locked loop (PLL) and the conversion of described data flow then.This process is acknowledged as clock and data recovery (clock and data recovery is called for short CDR).For the normal operation of this scheme, described data flow needs any drift of frequent conversion (transition) with the oscillator that can proofread and correct described phase-locked loop.Clock recovery unit can move the restriction that how long and not to need to change and be considered to maximum consecutive identical specification numbers (maximum consecutive identicaldigits specification).
In another kind of scheme, delay lock loop (DLL) can be used for discerning the clock skew between sender and the recipient.Described delay lock loop be one to the similar data circuit of phase-locked loop (PLL), the main distinction is that described delay lock loop does not have internal voltage controlled oscillator.Described delay lock loop can be used for changing the phase place of clock signal (signal with periodic waveform), is commonly used to improve the rising edge clock of integrated circuit (such as DRAM) to data output characteristic effective time (clock rise-to-data output valid timingcharacteristics).Described delay lock loop also can be used as clock and data recovery (CDR).From the outside, described delay lock loop can be regarded as the negative delay gate on the clock path that is placed on digital circuit.
Described subcarrier recovers the sub-carrier information that module 218 is recovered in described vision signal.For example, when the transmission active video signal, black and white brightness part will be as main signal, and chrominance section will be as subcarrier.In order to reduce the bandwidth of chrominance carrier, by on a scan line, using half vertical resolution, the sample rate of chrominance information by from four be reduced to one (this be since human eye to the susceptibility of colourity not as good as susceptibility to brightness).In addition, only transmission is blue and red, determines green according to deduct the blue and red remainder that obtains from brightness.Except the mode difference of coding, a lot of radio data systems use different subcarrier frequencies.In other implementations, composite video is combined with each other subcarrier signal and main baseband signal, yet the S-video is placed on chrominance carrier and brightness subcarrier respectively on the different circuits, can weaken the cross-talk between the subcarrier like this, improves the bandwidth of signal and the acutance and the brightness of image.
A comb filter is used as Y/C separation module 220.In a kind of scheme, described comb filter makes a signal and the stack of its time delayed signal, thereby produces phase cancellation.The frequency response of comb filter is made up of the peak that a series of regular intervals distribute, and looks similar with comb.Described luminance signal (Y, GTG) and described chrominance information (C, color) are stated from signal separation, synchronous to last.In composite video, described luminance signal process low-pass filtering is to prevent the cross-talk between high-frequency brightness information and the chrominance carrier.In the S-video with colourity and brightness as the signal that separates, improved the bandwidth of monochrome information like this, also can prevent the colourity crosstalk problem.
Described UV demodulation module 222 will be a luminance component (Y) and two chromatic components (UV) from the conversion of signals of Y/C separation module 220.Described color space conversion module 224 is transformed into Y ' CbCr space with described signal from yuv space.Y ' CbCr is a kind of of color space, and the coloured image that is typically used in video or the numerical digit camera chain is handled continuously.Y ' is luminance component (luma), and Cb and Cr then are blue dyeing degree component and red dyeing degree component.Y ' CbCr is approximate for conforming a kind of reality of color treatments and perception, wherein the red, green and blue three primary colors is treated to significant information in the perception.Like this, successive image/Video processing, transmission and storage can be carried out, and introduce error with meaningful ways in the perception.With high-resolution storage or with the luminance signal among high bandwidth transmission Y ' CbCr (Y '), bandwidth, double sampling, compression or other processing fall in (Cb and Cr) to two chromatic components, can improve system effectiveness like this.
Described CCIR656 module 226 is a digital visual interface.In one implementation, before horizontal blanking district (horizontal blanking region) beginning, before first active samples of each row and after the last active samples, produce a sync packet.Described sync packet comprises 4 10 words, and first three word is always same, is 0x3FF, and the 0,0, four word comprises 3 flag bits and an error-correcting code.
Flag bit (being commonly called the XYZ word) in the 4th word can be called as H, F and V.The beginning of described H bit representation horizontal blanking (horizontal blank).H in the sync packet before the described horizontal blanking district is set to 1, and these bags are commonly referred to motion video and finish (End of Active Video is called for short EAV) packets of information.Same, the H in the packets of information that occurs before motion video begins is set to 0, and these bags are commonly referred to motion video and begin (Start of Active Video is called for short SAV) packets of information.For example, described V position is used for representing the beginning of vertical blanking district (vertical blanking region).The EAV packets of information of V=1 represents that ensuing row (row that begins from EAV) is the part of down suction (vertical interval) in it.EAV packets of information of V=0 represents that ensuing row is the part of live image in it.In interlacing scan with cut apart in the frame format, the described row of described F bit representation is from first still second.In progressive-scan format, described F position is set to 0.
Described CCIR656 module 226 produces the motion video opening code SAV code and the motion video end code EAV code of outputting video signal according to the control of described quick switch controller 202, according to the respective channel number modification motion video opening code SAV code of motion video passage and the check digit of motion video end code EAV code, motion video opening code and the motion video end code with described modification transfers to one or more motion video displays subsequently.
Fig. 3 is the flow chart of the method for the tracking multi video channel in the embodiment of the invention.This method can be carried out by the quick switch controller among Fig. 2 202.In one embodiment, described method starts from operating 302.After the order that receives a plurality of video channels of monitoring, described method enters operation 304, follows the tracks of a plurality of video source that described Video Decoder is received at quick switch controller 202 described in the operation 304.In an implementation, the tracking of described video channel can be carried out with the endless form shown in Fig. 3, and described circulation is from following the tracks of video source 0 (308), follow the tracks of video source 1 (310), follow the tracks of video source 2 (312) ..., to following the tracks of video source N-1 (314), get back to afterwards and follow the tracks of video source 0.In another kind of implementation, the tracking of video channel can be carried out based on the order of programming in advance that the designer selects.In this example, the processing sequence of video channel can be notified to other modules of described video encoder, like this can be so that the work that all modules of described video encoder can be coordinated.In another implementation, when detecting certain video channel, described quick switch controller 202 do not have signal, and it will keep the tracking of these information, and will skip these video channels in passage handover operation process subsequently.Similar, certain video channel does not have the such information of signal to be notified to other modules of described Video Decoder, the work that all modules of described like this video encoder can be coordinated equally.
Fig. 4 is the flow chart of the method for the video channel of tracking in the embodiment of the invention.This method also can be carried out by the quick switch controller among Fig. 2 202.As shown in Figure 4, described method starts from operating 402, enters operation 404 afterwards.In operation 404, carry out first judgement, judge that whether described Video Decoder is to monitor the current video passage for the first time, also can become and whether pass through for the first time.If described Video Decoder is for the first time to monitor the current video passage, promptly operate 404 to be judged as be that described method enters operation 406.If described Video Decoder is not for the first time to monitor the current video passage, promptly operate 404 be judged as not, described method enters operation 410.
In operation 406, described method is carried out the function of described Video Decoder as the starting stage.In the starting stage, if described Video Decoder does not detect vision signal in this video channel, then send a timeout signal, described method enters operation 408, carries out and the overtime relevant program of passage in operation 408.Opposite, if described Video Decoder detects vision signal in this video channel, described method enters operation 414.
In operation 410, described method is loaded the channel parameters (also can be referred to as the signal characteristic of video channel) that is stored in the described fast parameter table 204 according to the first pre-treatment of this video channel.The channel parameters that collects in the first pre-treatment of this video channel can be made the vision signal that enters that is used for handling this video channel by the module of described Video Decoder (ratio is module 202 to 226 as shown in Figure 2).Because the previous signal characteristic of this video channel also can be used for the subsequent treatment of this same video channel, carrying out the time that some functions spent like this will significantly be reduced, and the row of carrying out such as acquisition module 210 detects the time of (line detect), mode detection and clock recovery function will be reduced greatly.
As indicated above, described acquisition module 210 detects the signal characteristic of each motion video passage, and the signal characteristic of each motion video passage comprises: the gain-adjusted of horizontal synchronization data (such as the Hsync signal), vertical synchronization data (such as the VSync signal), composite sync data, NTSC/PAL mode data, clock rate (clock rate), clock skew (clock offset) and each motion video passage etc.
In operation 412, described method enters tracking phase, checks the vision signal that enters from the passage of monitoring.If described Video Decoder does not detect vision signal in this video channel, then send a timeout signal, described method enters operation 408, carries out and the overtime relevant program of passage in operation 408.Opposite, if described Video Decoder detects vision signal in this video channel, described method enters operation 414.
In operation 414, as Fig. 2 describe from module 206 to module 226, described vision signal is controlled and handled to described Video Decoder.In described frame of video processing procedure, described method continues the feature of the vision signal of this video channel of detection, and upgrades described parameter list based on gathering from the described extraneous information that enters vision signal in the decoded back of each frame of video.
Carry out secondary judgement in operation 416, whether judgement finishes dealing with from the frame of video of the predetermined quantity of this video channel.According to the quantity of video channel and the performance of described Video Decoder, the designer can set the predetermined quantity of frame of video for each video channel.In an example, if two video channels are arranged, can set eight frame data of described Video Decoder processing from a video channel, switch the eight frame frame of video of going to handle another video channel afterwards.In another example, if four video channels are arranged, can set four frame data of described Video Decoder processing from a video channel, switch afterwards and go frame of video of handling another video channel or the like.If the frame of video of predetermined quantity is untreated finish, promptly operating 416 is not, and described method then continues to get back to operation 410.If the frame of video of predetermined quantity is finished dealing with, promptly operate 416 for being, described method then finishes in operation 418.
Fig. 5 a to Fig. 5 b is the schematic diagram of the method for switching two video channels in the embodiment of the invention.Shown in Fig. 5 a, described multi-channel video decoder switches between two input video passages, is respectively passage 1 and passage 2.In this example, the described multi-channel video decoder of pre-programmed is only handled a frame video from a passage before switching to another passage.Behind the video of having handled passage 1, described multi-channel video decoder switches the incoming video signal that removes to handle passage 2, shown in arrow mark 502.The vertical synchronizing signal VSync of described multi-channel video decoder searches passage 2, the general offset half period of vertical synchronizing signal VSync of the vertical synchronizing signal VSync of described passage 2 and passage 1.Behind the vertical synchronizing signal VSync that detects passage 2, described multi-channel video decoder removes to handle the incoming video signal of passage 2, and produces video output channel 2.Similar, behind the video of having handled passage 2, described multi-channel video decoder switches to passage 1, shown in arrow mark 504, and the vertical synchronizing signal VSync of search passage 1.Behind the vertical synchronizing signal VSync that detects passage 1, the incoming video signal of described multi-channel video decoder processes passage 1, and produce video output channel 1.What described multi-channel video decoder constantly repeated switches to another passage from a passage, shown in arrow mark 506 and 508.
The processing frame per second that it should be noted that described multi-channel video decoder is with relevant in the vertical synchronization time (Vsyn timing) of handling the input video between the video channel.Shown in Fig. 5 a, the general offset half period of vertical synchronizing signal between two input video sources (CVBS_1 and CVBS_2) makes described multi-channel video decoder detect the vertical synchronizing signal of next passage like this in the half period of an about frame.Shown in Fig. 5 a, because being programmed to each passage, the decoding of described multi-channel video handles 1 frame, and overall frame per second is approximately 1/ (1+.5), and wherein .5 is the time of detecting the vertical synchronizing signal of next passage.In this scene, under the PAL pattern, overall frame per second is 25*1/ (1+.5), and near 16.66 frame per seconds, each passage (passage 1 and passage 2) occupies half overall frame per second, is approximately 8.33 frame per seconds.Under the NTSC pattern, overall frame per second is 30*1/ (1+.5), is 20 frame per seconds, and each passage (passage 1 and passage 2) occupies half overall frame per second, is approximately 10 frame per seconds.
Example broadly similar shown in example shown in Fig. 5 b and Fig. 5 a, difference are that passage 1 among Fig. 5 b and the incoming video signal in the passage 2 are homophases.In this example, before switching to another passage, described multi-channel video decoder is only handled a frame of a passage.Behind the video of having handled passage 1, described multi-channel video decoder switches the vision signal of removing to handle passage 2.Because incoming video signal is homophase, the time that described multi-channel video decoder need spend a whole frame is removed the vertical synchronizing signal VSync of sense channel 2, shown in arrow mark 510.
Behind the vertical synchronizing signal VSync that detects passage 2, described multi-channel video decoder removes to handle the incoming video signal of passage 2, and produces video output channel 2.Similar, after the vision signal of having handled passage 2, described multi-channel video decoder switches to passage 1, shown in arrow mark 512, and the vertical synchronizing signal VSync of search passage 1.Behind the vertical synchronizing signal VSync that detects passage 1, the incoming video signal of described multi-channel video decoder processes passage 1, and produce video output channel 1.What described multi-channel video decoder constantly repeated switches to another passage from a passage, shown in arrow mark 513.
With the example class shown in Fig. 5 a seemingly, the processing frame per second of described multi-channel video decoder is with relevant in the vertical synchronization time (VSync timing) of handling the input video between the video channel.Here, the vertical synchronizing signal between two input video sources (CVBS_1 and CVBS_2) probably is offset one-period, makes described multi-channel video decoder spend about one-period like this and goes to detect described vertical synchronizing signal.Because described multi-channel video decoding is programmed to each passage and handles 1 frame, overall frame per second is approximately 1/ (1+1), and wherein second 1 is the time of detecting the vertical synchronizing signal of next passage.In this scene, under the PAL pattern, overall frame per second is 25*1/ (1+1), and near 12.5 frame per seconds, each passage (passage 1 and passage 2) occupies half overall frame per second, is approximately 6.25 frame per seconds.Under the NTSC pattern, overall frame per second is 30*1/ (1+1), is 15 frame per seconds, and each passage (passage 1 and passage 2) occupies half overall frame per second, is approximately 7.5 frame per seconds.
Technical scheme of the present invention can be implemented as a kind of method, also can be implemented as a kind of system.Each module in the described multi-channel video decoder also can be described as so-and-so circuit, such as acquisition cuicuit, row testing circuit, pattern detection circuit, clock recovery circuitry, automatic gain control circuit, subcarrier regenerator, y/c separation circuit, UV demodulator circuit, color space converting circuit and CCIR656 circuit or the like.Described a plurality of motion video display does not also mean that independently a plurality of display screens, can be the different display positions of same display screen yet, and " device " word in the video display does not here have particular determination, just a noun suffix.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (20)
1. Video Decoder is characterized in that it comprises:
Multiplexer is used for receiving the signal of plural motion video passage;
Analog to digital converter, the signal from analog format conversion that is used for receiving from described multiplexer is a number format;
Acquisition cuicuit is used for detecting the signal characteristic of each motion video passage;
Quick handoff parameter table is used for storing the signal characteristic of each motion video passage; With
Quick switch controller is used for controlling described multiplexer and described acquisition cuicuit uses the signal characteristic that is stored in each the motion video passage in the described fast quick change parameter list.
2. Video Decoder according to claim 1 is characterized in that: described acquisition cuicuit comprises capable testing circuit, pattern detection circuit, clock recovery circuitry and automatic gain control circuit.
3. Video Decoder according to claim 1 is characterized in that: the signal characteristic of each motion video passage comprises: the gain-adjusted of horizontal synchronization data, vertical synchronization data, composite sync data, NTSC/PAL mode data, clock rate, clock skew and each motion video passage.
4. Video Decoder according to claim 1 is characterized in that: described quick switch controller comprises: the logic of the logic of control CCIR656 circuit and the read-write of the described quick handoff parameter table of control.
5. Video Decoder according to claim 4 is characterized in that: the logic of control CCIR656 circuit comprises: produce the logic of the motion video opening code of outputting video signal and motion video end code and number revise the logic of the check digit of motion video opening code and motion video end code according to the respective channel of motion video passage.
6. Video Decoder according to claim 1 is characterized in that: described quick switch controller comprises: follow the tracks of the logic of each motion video passage and the logic of following the tracks of each motion video passage in the pre-programmed mode in a looping fashion.
7. Video Decoder according to claim 6 is characterized in that: the logic of following the tracks of each motion video passage comprises:
Detect switching of handling for the first time into the logic of motion video passage;
Detection with reprocessing switch into the logic of motion video passage; With
When in described motion video passage, not detecting signal, produce the logic of timeout signal.
8. Video Decoder according to claim 7 is characterized in that: the logic of following the tracks of each motion video passage further comprises:
According to the logic of the frame of predetermined quantity being handled the signal of described motion video passage.
9. Video Decoder according to claim 1, it is characterized in that: it further comprises: subcarrier regenerator, y/c separation circuit, UV demodulator circuit, color space converting circuit and CCIR656 circuit.
10. multi-channel video processing method is characterized in that it comprises:
Utilize multiplexer to receive the signal of plural motion video passage;
Utilize analog to digital converter to be number format from the signal from analog format conversion that described multiplexer receives;
Utilize acquisition cuicuit to detect the signal characteristic of each motion video passage;
The signal characteristic of each motion video passage of storage in quick handoff parameter table; With
Control described multiplexer and described acquisition cuicuit profit and make the signal characteristic that is stored in each the motion video passage in the described fast quick change parameter list.
11. method according to claim 10 is characterized in that: the signal characteristic that detects each motion video passage:
Detect the row bound of described signal;
Detect the pattern of described signal;
Detect the clock rate and the deviation of described signal;
Detect the gain-adjusted of described signal.
12. method according to claim 10 is characterized in that: the signal characteristic of each motion video passage comprises: the gain-adjusted of horizontal synchronization data, vertical synchronization data, composite sync data, NTSC/PAL mode data, clock rate, clock skew and each motion video passage.
13. method according to claim 10 is characterized in that: described control also comprises:
Control CCIR656 circuit produces outputting video signal; With
Control the read-write of described quick handoff parameter table.
14. method according to claim 13 is characterized in that: control described CCIR656 circuit and comprise: produce the motion video opening code of outputting video signal and motion video end code and number revise the check digit of motion video opening code and motion video end code according to the respective channel of motion video passage.
15. method according to claim 10 is characterized in that: described control also comprises:
Follow the tracks of each motion video passage in a looping fashion and follow the tracks of each motion video passage in the pre-programmed mode.
16. method according to claim 15 is characterized in that: follow the tracks of each motion video passage and comprise:
Detect switching of handling for the first time into the motion video passage;
Detection with reprocessing switch into the motion video passage; With
When in described motion video passage, not detecting signal, produce timeout signal.
17. method according to claim 16 is characterized in that: the logic of following the tracks of each motion video passage further comprises:
According to the signal of the frame of predetermined quantity being handled described motion video passage.
18. a multi-channel video treatment system is characterized in that it comprises:
Plural number motion video source;
The Video Decoder that is connected with described plural motion video source, it comprises: the multiplexer that receives the signal of described plural motion video passage, the signal from analog format conversion that will receive from described multiplexer is the analog to digital converter of number format, detect the acquisition cuicuit of the signal characteristic of each motion video passage, store each motion video passage signal characteristic quick handoff parameter table and control described multiplexer and described acquisition cuicuit utilization is stored in the quick switch controller of the signal characteristic of each the motion video passage in the described fast quick change parameter list; With
The one or more motion video displays that are connected with described Video Decoder, wherein one or more motion video displays show the vision signal from described plural motion video source simultaneously.
19. system according to claim 18 is characterized in that: described Video Decoder further comprises: subcarrier regenerator, y/c separation circuit, UV demodulator circuit, color space converting circuit and CCIR656 circuit.
20. system according to claim 19 is characterized in that: described CCIR656 circuit comprises:
Produce the motion video opening code of outputting video signal and the logic of motion video end code;
Number revise the logic of the check digit of motion video opening code and motion video end code according to the respective channel of motion video passage; With
The logic that the motion video opening code and the motion video end code of described modification transferred to one or more motion video displays.
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| US201113083454A | 2011-04-08 | 2011-04-08 | |
| US13/083,454 | 2011-04-08 |
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Application publication date: 20111109 |