CN1048138C - Multimode interpolation filter as for a TV receiver - Google Patents
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- CN1048138C CN1048138C CN94195033A CN94195033A CN1048138C CN 1048138 C CN1048138 C CN 1048138C CN 94195033 A CN94195033 A CN 94195033A CN 94195033 A CN94195033 A CN 94195033A CN 1048138 C CN1048138 C CN 1048138C
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Abstract
The present invention relates to a multimode scan converter which comprises a delay unit (33) which is used for causing a video signal to delay one horizontal row and selectively redisplay the row. To selectively provide a luminance signal or a chrominance signal to the delay unit, a multiplexer (30) is arranged. An output signal of the delay unit and an output signal of the multiplexer are coupled to a ratio circuit (34) and added in the complementary proportion by the ratio circuit (for example, K and 1-K). To selectively pass through the luminance signal and a signal which comes from the ratio circuit, a second multiplexer (35) of the output luminance signal which is used for providing the conversion is arranged. To selectively pass through the chrominance signal and the signal which comes from the ratio circuit, a third multiplexer (36) of output chrominance signal which is used for providing the conversion is arranged.
Description
The present invention relates to be used for scan conversion comes across the interpolater of the decompressed video signal in the plurality of optional form.
Background of the present invention
Along with the appearance of compressed video signal transmission, can expect: competitive in order to make receiving equipment, no matter which kind of form the video data that is transmitted is, it can both come display image with standardized form.For example, according to the vision signal of MPEG2 form (Motion Picture Experts Group of International Standards Organization) compression, can represent the image of 4: 2: 2 forms, 4: 2: 0 forms and other various forms.No matter which kind of form what transmitted is, receiver should show all images with for example 4: 2: 2 forms.
There are a lot of known systems to can be used to carry out scan conversion from a kind of form to another kind of form.In general, such system is optimized for being transformed into second kind of particular signal formats from a kind of particular signal formats.Yet, in the environment of television receiver, comprise a plurality of optimized scan converters, make the signal transformat of each expection that a converter all be arranged, that is unpractiaca.Scan conversion must be adopted compromise method, that is, with single, have and can accept but be not that the conversion equipment of optimum performance comes the multiple signal format of conversion.
Please refer to the MPEG2 standard of supporting different compression processing and different resolution form.Different compressions is handled and is comprised processing in interior processing of frame and the field.
The initial data of handling from mpeg decode is a video signal frame.Full resolution frames (4: 2: 0) comprises 480 row luminance signal and 240 circumstances in which people get things ready for a trip degree signals.Half-resolution frame (4: 2: 0) comprises 240 row luminance signal and 120 circumstances in which people get things ready for a trip degree signals.In the full resolution mode, can be numbered decoded row:
Y1，Y2，Y3，Y4，Y5，Y6，………Y480
C1，C2，C3，C4，…………………C240；
In the half-resolution mode, can be numbered decoded row:
Y1，Y2，Y3，Y4，Y5，Y6，………Y240
C1，C2，C3，C4，…………………C120。
The brightness line number of mpeg decoder output is the twice of colourity line number always.Yet, can be expressed as 4: 2: 2 display formats of required output:
OY1，OY2，OY3，OY4，………OY480
DC1，DC2，DC3，DC4，……DC480。
Do not consider original resolution, the colourity line number is carried out up conversion.In the half-resolution mode, brightness line number also up conversion.Depend on the preliminary treatment of being carried out when producing compressed signal before compression is handled, the up conversion mode is variable.Some up conversion mode more helps pretreated signal up conversion in the frame; Other up conversion modes more help pretreated signal up conversion between the field.The present invention is used for carrying out the interpolater of so vertical up conversion of multimode vision signal just.
Brief summary of the invention
This interpolater comprises and being used for a delay time horizontal line and show the delay unit of that delegation selectively again of vision signal.In order selectively decoded luminance signal or decoded carrier chrominance signal to be provided on the delay unit, multiplexer has been installed.The output signal of the output signal of delay unit and multiplexer is coupled on the ratio circuit, and ratio circuit is with ratio (for example, K and the 1-K) addition of this binary signal with complementation.For selectively by decoded luminance signal or from the signal of ratio circuit, having installed provides second multiplexer of the output luminance signal of up conversion.For selectively by decoded carrier chrominance signal or from the signal of ratio circuit, having installed provides the 3rd multiplexer of the output carrier chrominance signal of up conversion.
Below, will describe the present invention in detail by means of accompanying drawing.
Fig. 1 comprises the exemplary receiver block diagram of implementing interpolater of the present invention;
Fig. 2 is the block diagram of interpolater one exemplary embodiment;
Fig. 3 and Fig. 4 are the schematic diagram of exemplary ratio and adder circuit;
Fig. 5～Figure 10 for for the vision signal of unlike signal form former begin and between the vision signal of up conversion the visualization of correlation represent;
Figure 11～Figure 17 is for comprising Fig. 2 apparatus operating parameters table.
Describe in detail
The present invention will describe by the mpeg signal processing environment, yet, should understand easily: work in the signal processing environment of multimode signal at other, also can implement the present invention.
Referring to Fig. 1, the vision signal of being transmitted of having compressed is added to from antenna on tuning/demodulator 10, and is tuning/10 pairs of signal demodulators that transmitted of demodulator, and it is transformed on the base band.In order to provide noise immunity, baseband signal is under subpackage and the alternative form to transmission.Baseband signal is added on the transport processor 12, and transport processor 12 is the video data deinterleave that compressed and unpacking.May also comprise error correction to a certain degree.The video data that compressed is coupled on the decompressor 14 from transport processor, and decompressor 14 and working storage 16 are for example carried out the back-pressure of the MPEG function that contracts jointly, are that the basis produces vision signal with the frame.That is, decompressor produces the data that decompress, and produces a frame at every turn.The vision signal that has decompressed is added on the display-memory 18, from display-memory 18 can the interlacing scan form the raster format sense data.Display-memory is believed to comprise address circuit, it when writing video data to should be in decompressor, when reading video data then in response to interpolater 20.
The video data that is under brightness and the chromatic component form is coupled on matrix and the display unit 22 by interpolater 20.Matrix and display unit 22 combine brightness and chrominance component signal, form red R, green G, the blue B signal of conventionally form, with excitation display device spare.Unit 10～20 is handled signal with digital form.In unit 22 (before matrix is handled) or after unit 22, will provide digital-to-analog converter.
As previously mentioned, the video data of the compression of transmission may be encoded with the processing mode and the various spatial resolution of field or frame.For the various forms of vision signals that decompressed up conversion on the vertical space direction is become 4: 2: 2 forms, comprised interpolater 20.
Fig. 2 illustrates the example of a multimode interpolater with the block diagram form.This interpolater is accepted 4: 2: 0 brightness Y of component, chrominance C signal on corresponding input link; And export component Y, the C signal of 4: 2: 2 forms.Interpolater comprises first multiplexer 35, and multiplexer 35 has the output link that is used to provide luminance output signal.Multiplexer 35 response full resolution/half-resolution control signal F/H make selectively directly and pass through from luminance input or from the luminance signal of ratio unit 34.Interpolater also comprises second multiplexer 36, and multiplexer 36 has the output link that is used to provide chrominance output signal.Multiplexer 36 responsive control signal F/H make selectively directly and pass through from the colourity input or from the carrier chrominance signal of ratio unit 34.
The 3rd multiplexer 30 has first and second inputs that are coupled to respectively on brightness and the colourity input, and multiplexer 30 is controlled by control signal F/H, so that make some the passing through in brightness and the chromatic component input signal.The output of the 3rd multiplexer is coupled on the input of the 4th multiplexer 32, also is coupled on the input of ratio unit 34.
The output link of the 4th multiplexer is coupled on a horizontal line (1H) delay unit 33, and the output of a horizontal line delay unit is then returned on second input that is coupled to multiple-path coupler 32.In order to be added to new component signal on the delay line 33 or the data in order to have comprised in the recirculation delay line 33, multiplexer 32 is controlled by a horizontal line multiplexer (1-H MUX) control signal.
The mpeg data that has compressed that is received by antenna comprises and the relevant control information of frame of compression that this control information points out whether present frame had carried out preliminary treatment by field or frame technique before the MPEG compression, and the resolution of condensed frame.Decompressor 14 extracts this control information, so that configuration is used for decompressor 14 that the present frame of packed data is decompressed.Decompressor 14 comprises enough hardware and softwares, so that whole inverse operations that the compression that the execution mpeg standard is supported is handled.
Control information is delivered on the controller 37 from decompressor 14.Controller 37 produces COEFFICIENT K according to frame control information, utilizes this coefficient that corresponding signal is proportioned or weighting.For example, utilize decompressor to extract suitable control information, utilize this control information to come read-only memory (ROM) the table (not shown) of addressing inside, can provide suitable k-factor from this table.Controller 37 also provides the proper signal that is used for controlling corresponding multiplexer, so that suitable component signal is passed through.
When control signal F/H was in its first state (F), multiplexer 30,35 and 36 passed through the signal that is added on its corresponding " 0 " input link; When signal F/H was in opposite second state (H), multiplexer 30,35 and 36 passed through the signal that is added on its " 1 " input link.Therefore, when multiplexer 35 luminance signal from the memory transfer to the unit on 38 and multiplexer 30 carrier chrominance signal from the memory transfer to the multiplexer on 32 the time, multiplexer 36 will make the signal from unit 34 pass through.On the other hand, when multiplexer 36 carrier chrominance signal from the memory transfer to the unit on 39 and multiplexer 30 luminance signal from the memory transfer to the multiplexer on 32 the time, multiplexer 35 will make the signal from unit 34 pass through.
Note, can utilize such random access memory: its memory capacity is enough to keep delegation's signal and its type for reading but do not destroy data, thereby can read repeatedly data from memory, to replace multiplexer 32 and delay line 33.At this moment, the function of multiplexer 32 will be carried out by selectively written allowance signal being added on this random access memory.
Fig. 3 and Fig. 4 illustrate ratio and 34 two kinds of optional circuit arrangement of assembled unit with the schematic diagram form.In general, the circuit of Fig. 3 is fairly simple, because it only needs a multiplexer and a control signal K; And the layout of Fig. 4 comprises two multiplexers, and needs two control signal K and (1-K).To the work of these circuit, will not add description, because these two kinds of circuit are all known.Need only illustrate that for K value pointed among the Table I-VII that lists below, with coefficient 1-K weighting, the signal that provides from multiplexer 30 is then with the COEFFICIENT K weighting from the signal of line storage 33.
In general, in corresponding data sequence (for example, image sets GOP etc.), it is constant that the control signal F/H of multiplexer keeps.That is, setting signal F/H is high level or low level when a frame begins, then at least in the lasting cycle of a whole frame signal F/H can remain under this state.When transmission half-resolution data, it is that control signal F/H can change between high and low in each pixel cycle or each line period that a kind of mode is arranged.
Interpolater 20 carries out up conversion to data in vertical direction by one of following manner:
1, repeated rows, this is exactly that the same delegation from display-memory 18 is repeated twice in succession simply;
2, repeat fields, Here it is repeating twice from the suitable alternately consecutive line (on the spot) of display-memory;
3, according to horizontal line signal adjacent in the display-memory, row in the middle of the interpolation;
4, repeated rows and field.
In the full resolution mode, luminance component does not need up conversion, and therefore, luminance signal does not just add through multiplexer 35 from display-memory with changing to be passed through.Carrier chrominance signal requires 1: 2 vertical up conversion.The equipment of Fig. 2 has considered to produce in two ways the carrier chrominance signal of up conversion: repeated rows and/or field; Perhaps, according to actual row and interpolation line.A kind of processing in back is comparatively superior, because the signal that is produced has higher apparent resolution.
Referring to Fig. 5～Figure 10.The little frame of each of left column is used to represent each row of interlaced scanned frames after the decompression of vision signal, and interpolater 20 can obtain this frame from display 18.The even field and the odd field of each line display interlaced scanned frames alternately.The little frame of each of middle column is used to represent the odd field that the up conversion of the interlacing scan output signal that provided by interpolater 20 is crossed; The little frame of each of right column is used to represent the even field that the up conversion of interlacing scan output signal is crossed.The arrow pointed out of the little frame of those row is represented the video line that decompresses from the left side, and the output video that produces middle column or right column according to this row is capable.The ratio that the numeral of following arrow is provided at this signal when utilizing original decompressed video to form one of odd number or even field.Numeral 1 means that the ratio that is provided is 100%, repeats at once.
At first consider the signal received be full resolution and, be to handle and compressed signal by the field.In the processing on the scene, each row of respective fields compresses independently in the corresponding condensed frame, and the result is that the respective fields of condensed frame is relatively independently.Like this, the up conversion for carrying out respective fields independently conforms with desirable.Fig. 5 illustrates, and goes the process of repetition up conversion for the carrier chrominance signal of compression.Repeat the alternate row of decompressed frame, so that produce the odd number output field of 1: 2 up conversion; Repeat the insertion row of decompressed frame, so that produce the even number output field of 1: 2 up conversion.
Table I among Figure 17 illustrates the visiting demand of memory, and impliedly shows the multipath conversion configuration of interpolater.Table I (and Table II～VII) showing: Programmable Logic Controller 37 provides k-factor, disposes corresponding multiplexer and adjusts display-memory so that the present frame of processed vision signal is provided the mode of the row of component video signal.Controller 37 can be the restructural state machine, and this state machine can dispose by subprograms corresponding or the ROM data that the control signal that decompressor 14 provides is started.
When the delegation's control signal in the Table I for " new " (NEW) state to adjust multicircuit switch 32 data are passed on the horizontal line delay line (line storage) from multiplexer 30.Control signal F/H is in the F state passes through the signal that is added on its corresponding " 0 " input link to adjust multiplexer 35,36 and 30.Like this, for odd field, multiplexer 35 leads to row order Y1 with normal enforcement from the brightness row (from the Y of memory) of display-memory, Y3, and Y5 is on the Y7 etc.; For even field, make it lead to Y2, Y4, Y6 is on the Y8 etc.Adjust multiplexer 30, make carrier chrominance signal lead on the circuit of multiplexer 32 and delay line 33 and unit 34 from display-memory 18 (from the C of memory); Adjust multiplexer 36, the signal from unit 34 is passed through.Because control signal K is zero, so, combine from the signal of unit 33 and 30 ratio with 1: 0, promptly multiplexer 36 is effectively by from display-memory and the carrier chrominance signal of the between-line spacing of having delayed time.In order to keep brightness and colourity that suitable vertical space relation is arranged, in odd field and even field, all be that first row of carrier chrominance signal is read from display-memory than the leading line time of first row of respective fields luminance signal.Other carrier chrominance signal from display-memory 18 is read twice from this display-memory in every line.Notice that the chromatic value that prints off with boldface letter in the Table I is the value of 20 outputs of interpolater in corresponding odd field and even field.
Suppose, display-memory is the storing one row signal in each vertical storage address, row is read and is performed such for twice, the vertical address that makes the used vertical storage address of chrominance section in the display-memory be used for the brightness part in the display-memory address of advancing when whenever advancing two vertical addresses.
Fig. 6 illustrate to full resolution, through interlude handle, the another kind of interpolation of 1: 2 up conversion of colourity.When handling according to Fig. 5, the odd field of up conversion and even field are respectively according to the odd-numbered line and the even number line of decompressed frame produce.Yet the odd and even number output field produces by different way.The row of odd field in the frame that the row of odd number output field in every line equals to have decompressed.Insertion row in the odd number output field is that the mean value according to front and back two odd-numbered lines at this insertion row place produces.For example, the capable O of output odd field
n=1/2C
N-1+ 1/2C
N+1, C herein
N-1And C
N+1Corresponding to the colourity row O in the frame that has decompressed
nOn and under the corresponding carrier chrominance signal value of odd-numbered line.The colourity output row O of odd number
N-1And O
N+1Equal C respectively
N-1And C
N+1
Odd field part referring to Table II among Figure 11.As can be seen, except the K value, identical with Table I.In having the display line of odd field that K is a null value, carrier chrominance signal is exported without change from line storage 33.For example, the carrier chrominance signal of odd field display line 1 (first row) is signal C1.In having the odd field display line that K is a nonzero value, carrier chrominance signal equals from the K of line storage signal (C1) extraordinarily from (1-K) of memory (that is, from multiplexer 30) signal doubly.For odd field display line 3, because K equals 1/2, so carrier chrominance signal equals 1/2 1/2 times of C3 extraordinarily of C1.
Each output provisional capital of corresponding even field is to go according to two of the even field that decompresses to produce with different ratios.For example in Fig. 6, even number output row En is according to the colourity row C that has decompressed
nAnd C
N+2Respectively with ratio 3/4 and 1/4 and produce.The output colourity row E of next even number
N+1Capable C according to the even frame that decompresses
nAnd C
N+2, respectively with ratio 3/4 and 1/4 and produce.
Even field part referring to Table II among Figure 11.From horizontal line control row as can be seen, adjust multiplexer 32, make data recirculation in the line storage with in every line cycle.A pair of row: C appears in can causing when working by this way during two display lines
nAnd C
N+2Please note a pair of signal in being designated as " from the C of memory " and " from the C of line storage " this two row consecutive line.After initial row output, the K value replaces between 1/4 and 3/4.4th, 6 and 8 row signals are:
C
4＝3/4C
2+1/4C
4
C
6＝1/4C
2+3/4C
C
8＝3/4C
4+1/4C
6
Deng
Fig. 7 illustrates the mode of the full resolution carrier chrominance signal of handling by frame rather than the field processing produces being carried out 1: 2 up conversion.Shown in the method display field repeat.That is, during odd field, whole colourity row of half vertical resolution in the decompressed frame are directly exported as the row of odd field; During even field, the line output of these same row as even field.
Table III among Figure 12 illustrates the state of a control of multiplexer.Utilize the F/H signal to adjust multiplexer 35,36 and 30, make brightness respectively, from the signal of unit 34 with from the chrominance passband mistake of memory from memory.Because during odd field, signal K equals 1, so, from the C signal of line storage with combine with 0: 1 ratio respectively from the C signal of memory.Like this, multiplexer 36 mainly is by the output signal from multiplexer 30.On the other hand, during the null even field of K in, multiplexer 36 is by from multiplexer 30 but the signal of the line period of having delayed time.In Table III, the colourity row that the colourity behavior of printing off with boldface letter is exported in the odd and even number field interval.
Fig. 8 illustrates with the form of visualization and is used for producing according to the signal that frame compressed the interpolation algorithm of odd and even number up conversion colourity field.The output row of odd field is according to the even number and the odd-numbered line of decompressed frame produce; The output row of even field is according to the even number and the odd-numbered line of decompressed frame produce.Each row of odd field produces the ratio of row with 1/4: 3/4 according to pursuing of frame.Each row of corresponding interlacing scan even field is according to similarly each produces the ratio of row with 3/4: 1/4 in the frame that has decompressed.
Table IV among Figure 13 illustrates the configuration of related corresponding signal of interpolation algorithm and control signal.Notice that one after the other read the whole colourities of dual numbers field and odd field provisional capital, rather than the dual numbers field is read even number line, odd field is read odd-numbered line from display-memory.Except the sequential value of K, dispose identical with Table III.Whole K values of odd field part are 3/4, therefore, and each row CO of odd number output field
nProduce according to following formula:
COn＝1/4C
n-2+3/4C
n-1
Whole each row CE of even number output field
nProduce according to following formula
CE
n＝3/4C
n-2+1/4C
n-1
Consider the compress mode of half-resolution.In order to produce 4: 2: 2 signals, need carry out 1: 4 vertical chrominance up conversion and 1: 2 vertical luminance up conversion.Because human eye is not so good as to the brightness sensitivity, so brightness is carried out interpolation and colourity is only repeated is desirable colour.1: 4 colourity up conversion is shown to Fig. 9 visualization.Represented is exactly in order to produce each row of output odd field, whole (odd and even number) colourity row of the half-resolution signal that has decompressed to be repeated twice; In order to produce each row of output even field, it is repeated twice again.
With the field repetitive mode colourity is carried out 1: 2 identical mode of up conversion, luminance component is carried out 1: 2 vertical up conversion.
The Table V of Figure 14 illustrates the interpolation configuration that this half-resolution is handled.The brightness of Table V partly is similar to the chrominance section of Table III.Yet be noted that multiplexer 36 is to adjust to the colourity row that can directly pass through from display-memory 18; Multiplexer 35 is then adjusted to can be by the luminance signal from unit 34; 30 of multiplexers are adjusted to luminance signal is led on the circuit of multiplexer 32 and line storage 33 from display-memory.
The Table VI of Figure 15 illustrates the working method of half-resolution, wherein, in odd field and even field, repeats whole colourity row; Interpolation is adopted in brightness, and does not adopt a repetition.
The Table VII of Figure 10 and Figure 16 illustrates the colourity filtering of half-resolution and the mode that luminance field repeats.
It is by the time division multiplexing of interpolater based on pixel realized, if carried out vertical up conversion before horizontal up conversion that colourity and luminance component all can be taked the half-resolution mode of interpolation.In the half-resolution mode, include only every row sampling number in each horizontal line partly.Delay unit 33 has the half-resolution row that enough memory spaces are stored colourity and luminance component simultaneously.Like this, can pixel ground interlock brightness and chroma sampling one by one, and interpolation colourity and luminance signal independently.Utilize multiplexer 35 and 36 to carry out the deinterleave of interpolation component.This operation is carried out as the clock of signal F/H by the clock (speed of input pixel) with pixel speed.To unit 34, the K value that required interpolation functions (can be aforementioned any interpolation functions) requires is also carried out time division multiplexing.
On the other hand, can be with behavior base, luminance and chrominance information is interlocked or multiplexing.In the case, the part out of the ordinary between first departure date makes delegation's luminance component and corresponding delegation chromatic component time division multiplexing.This time division multiplexing can be by realizing as the clock of signal F/H with the scanning frequency rate.Separating of interpolation brightness and chromatic component will realize by the multiplexer 35 and 36 that is controlled by line frequency control signal F/H.The desired K value of required interpolation functions (can be aforementioned any interpolation functions) is also carried out time division multiplexing to unit 34.
In a kind of optional mode in back, the output interpolation line of colourity and luminance component for example will be compressed in the half-line period.For these signal extension are arrived whole line period, corresponding time extension circuit 38 and 39 on the output link of corresponding multiplexer 35 and 36, have been comprised.Time extension circuit or grating converter are known, and it operates in this will not add description.
Claims (4)
1, is being used for to compressing through multiple mode and have in the video signal decompression system that the vision signal of multiple spatial resolution decompresses, a kind of multimode converter that is used for the vision signal that has decompressed is carried out up conversion, described decompression systems provides with brightness and chromatic component form and is stored in the video signal frame that has decompressed in the display-memory, and provide and indicate resolution and the control signal of the mode that adopts when decompressed video was originally handled, it is characterized in that, comprising:
First and second multiplexers (35,36), these multiplexers have separately first the input link so that accept described brightness respectively and described chromatic component, also have the output that is used to provide the output component vision signal separately, also have separately second the input link;
Interpolater (30～34), this interpolater have the output link on the second input link that is coupled to first and second multiplexers; And
Control device (37), this control device responds described control signal, is used for adjusting described interpolater and described multiplexer, so that provide one of the described brightness of up conversion and chrominance component signal in vertical direction at least to predetermined vertical resolution.
2, according to the system described in the claim 1, it is characterized in that, wherein said control device (37) provides signal in described multiple mode and the spatial resolution each according to different row orders, so that adjust described display-memory (18), thereby selectively the luminance and chrominance information row is provided on described first, second multiplexer (35,36) and the described interpolater (30～34).
According to the system described in the claim 1, it is characterized in that 3, wherein said interpolater comprises:
Line storage (33), this line storage be used for packing into the selectively capable signal of described brightness or chromatic component and the described signal of output time-delay delegation or the described signal of twice time-delay delegation selectively;
Ratio circuit (34), this ratio circuit is used for producing from the component signal of described display-memory and weighted sum from each row of the component signal of delaying time of described line storage, wherein, with COEFFICIENT K and 1-K to from each row of the component signal of described display-memory with from each row weighting of the component signal of delaying time of described line storage, herein, COEFFICIENT K for provide by described control device less than 1 value.
4, a kind of multimode converter that is used on the spatial vertical direction vision signal being carried out up conversion is characterized in that it comprises:
The source of brightness and chrominance video signal, wherein at least a signal will carry out up conversion;
First and second multiplexers, these multiplexers have the corresponding bright that is coupled to described source and the first input end on the colourity output respectively, also have second input separately and be used to provide the output separately of exporting luminance and chrominance information respectively;
Storage device, this storage device are used for store video horizontal line signal, and, thereby being used for responsive control signal provides the signal of being stored selectively during a plurality of horizontal line;
The 3rd multiplexer, this multiplexer have described corresponding bright and first and second inputs on the colourity output that are coupled to described source and are coupled to output on the described storage device input;
Ratio and combinational circuit, this which couple is used for combining selectively with predetermined ratio from the signal of described the 3rd multiplexer and signal from described storage device to the output of the output of described storage device and described the 3rd multiplexer;
Control circuit, this circuit is used for: (one) sets up by described ratio and combinational circuit selectively in order to a signal and the ratio of getting up from the signal combination of described storage device from described the 3rd multiplexer; (2) thus the control store device makes from the luminance signal and the carrier chrominance signal in described source and passes through respectively so that repeat the capable signal stored selectively and adjust the described first and the 3rd multiplexer; And (three) thus adjusting described second multiplexer passes through the signal from described ratio and combinational circuit, perhaps, adjust the described second and the 3rd multiplexer in case make from the carrier chrominance signal in described source and luminance signal respectively by and adjust described first multiplexer so that the signal from described ratio and combinational circuit is passed through.
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| WO1992020191A1 (en) * | 1991-04-29 | 1992-11-12 | Rca Licensing Corporation | Video signal decompression apparatus for independently compressed even and odd field data________________________________________ |
| US5194937A (en) * | 1991-09-30 | 1993-03-16 | Samsung Electronics Co., Ltd. | Television signal converting apparatus and method |
| CN1080453A (en) * | 1992-05-26 | 1994-01-05 | 通用电气公司 | Digital video signal processor apparatus |
| CN1081050A (en) * | 1992-06-22 | 1994-01-19 | 汤姆森电子消费品公司 | The adaptive interpolation method and apparatus |
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| CN1142879A (en) | 1997-02-12 |
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