CN1045674A - High definition b-mac television signal transmission system - Google Patents
High definition b-mac television signal transmission system Download PDFInfo
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- CN1045674A CN1045674A CN89109266A CN89109266A CN1045674A CN 1045674 A CN1045674 A CN 1045674A CN 89109266 A CN89109266 A CN 89109266A CN 89109266 A CN89109266 A CN 89109266A CN 1045674 A CN1045674 A CN 1045674A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/015—High-definition television systems
- H04N7/0152—High-definition television systems using spatial or temporal subsampling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
- H04N11/08—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using sequential signals only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N11/00—Colour television systems
- H04N11/24—High-definition television systems
- H04N11/28—High-definition television systems involving bandwidth reduction, e.g. subsampling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
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- Engineering & Computer Science (AREA)
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- Television Systems (AREA)
- Color Television Systems (AREA)
- Compression Or Coding Systems Of Tv Signals (AREA)
Abstract
A kind ofly high definition MAC colour television system TV signal is encoded for the device of transmission by means of removing predetermined sample, comprise the path (Figure 17,18) that brightness and chrominance signal component are handled respectively, mix the composite signal that the luminance and chrominance information component of handling respectively becomes transmission by two shared skew symmetry filter segments (1710) of treatment channel.The skew symmetry filter segment (1901) of the filtering part complementation of a pair of code device is relevant with the decoder that a high-definition TV receiver links.Predetermined sampling is carried out diagonal angle filtering, and horizontal resolution information is folded into signal, improves vertical resolution by the scan conversion in the receiver.
Description
The present invention relates to television signal transmission system, particularly about a kind of like this television signal transmission system, it is used to transmit a kind of signal, compares with the transmission signals by the standard resolution of National Television System Committee (NTSC) or European standard, and this signal can provide higher picture resolution.
The TV signal that can both increase the transmission of image definition in the horizontal and vertical directions comes into one's own day by day.In vertical direction, sort signal can double than the line number of current standard, and simultaneously, the pixel of every row also increases in the horizontal direction.Owing to use the general level and the result of vertical resolution, the transmission signals wide screen shown to have opposite effect.If watch from a relative very near distance, spectators see that normal signal can complain that image quality is fuzzy or unclear.These disadvantageous effects can be overcome by the image of a high-resolution, but existing transmission system is not suitable for transmitting high-resolution picture.
In U.S. Patent Application Serial is 092305, has described a kind of solution that the signal transmission bandwidth provides high-resolution picture that do not need to increase in the patent application of the applying date on September 2nd, 1987.A high-resolution signal diagonal angle filtering, and in interlacing, alternately lose sample according to the digital sampling technology, stay next 5 shapes or quincunx pattern.The odd-numbered line sampling is added in the even number line sampling, forms a capable cumulative signal.Utilize the skew symmetry filtering technique, the high-resolution horizontal information is folded into carry usually in the signal area of boundary value to angle information.Loss to angle information in the transmission signals can not cause perceptible difference to high-resolution input initial on the transmitter.The letter store video is capable in transmitter, does not need a storage.In addition, compare with the insertion technology of prior art, the required digital filtering of receiver is also relatively cheap.
The another kind of solution of transmission high-resolution picture problem is to transmit a standard television signal, and makes and send a so-called enhancing passage.According to above-mentioned first kind of scheme, need a kind of new receiver, be used for handling the standard bandwidth signal that receives.According to second kind of scheme, the receiver circuit that is used to receive with the display standard resolution image needn't change, yet need an independent adjunct circuit, be used to receive the enhancing passage that comprises high-resolution data, and high-resolution data reassembled into the standard resolution image, so that a high-resolution picture is provided.
The series number that proposes on August 4th, 1988 is to have described a kind of the use in 228274 the U.S. Patent application to strengthen the method and apparatus that passage increases the definition of ntsc video signal.According to the method for using in this application, from a high definition television signals, produce a row and signal and a capable difference signal.By at the middle of bandwidth of video signal row and signal upset alternate sampling, can convert the high-resolution horizontal information to base band, and it is added on the high-resolution vertical information of row difference signal, enhancing passage on request transmits together.
But, these schemes all can not solve such problem, promptly provide a method to the problem that sends high definition MAC colour television system (MAC) TV signal, compare level and vertical resolution with the standard resolution TV signal, but do not need to change the existing MAC reception/decoding device that is used for acceptance criteria resolution MAC composite signal with increase.
During the seventies, the colleague of the inventor and Britain Independent Broadcast Authority is applied to digital TV field to inferior Nyquist sampling techniques.Be published in by the K.H Barratt and the inventor on the I.B.A.Technical Review on the 3-15 page or leaf, be entitled as in the article of " the Nyquist sampling is introduced ", describing and be used to eliminate the digital technology of obscuring.On the 21-26 page or leaf by in the one piece of companion's article that is entitled as " digital inferior nyquist filter " that J.H.Jaylor write, described a kind of comb filter that is used for video data down-conversion and up-conversion, it can be used under the occasion of PAL TV signal optimizes signal sampling.These antialiasing digital sampling technology provide experimental basis for improving horizontal resolution; Yet, still need technically a kind ofly can improve the level of the MAC colour television system TV signal that is transmitted and the method and apparatus of vertical resolution simultaneously.
The present invention relates to a kind of method and apparatus that is used for transmission and receiving high definition MAC colour television system (MAC) TV signal.Type B MAC transmission standard according to the composite signal transmission, transmit vision signal between an effective departure date, and comprised other all signals at a line blanking period or long field blanking interval, these signals comprise audio frequency at least, control data, application data and teletext.Luminance and chrominance information separately is digitized sampling during each in a video line signal, compression and transmission.According to known B-MAC standard, in order to transmit, the brightness sampling is compressed by 3: 2 ratio, and colourity was by 3: 1 ratio compression.Chrominance information converts U and V component to, transmits one-component in every line.
For general, or realize the transmission of high-definition video information down according to the restriction of the MAC colour television system standard of the inventive method, a high-level sharpness information is amounted to into the diagonal components of sampling vision signal.Be lower than 5MH
z(by pattern, the time axial compression to be condensed at 3: 2 o'clock be 7MH
z) base band frequency under, do not change the frequency spectrum of signal.Therefore, because the B-MAC decoder of standard generally all is equipped with 6.3MH at its input
zThe passband low pass filter, folding high definition information can not influence reception.Additional transmission information on high frequency is by total blockage and ignore.
Especially, according to transmission method of the present invention, at first with 28MH
z(color subcarrier 3.85MH
z8 times of speed or 8F
SC) to a high-definition analog tv signal orthogonal sampling.Its result obtains a two-dimensional sampling frequency spectrum, and it is by a diagonal angle digital filter then, and filter has reduced the diagonal frequencies response, but this reduction almost is inconspicuous to the televiewer.
Then, utilize interlacing to abandon alternate sampling, remove most of diagonal angle filtering data, its result stays next 5 shapes or the sampling of plum blossom figure.Because alternately remove the result of sampling, baseband frequency spectrum remains unchanged, but exist the high frequency resolution that comprises level and vertical resolution component to repeat frequency spectrum in half sampling frequency and sampling frequency place, this repetition frequency spectrum is used for additional resolution is folded into baseband signal.
After this can convert the sampling of folded signal to analog form, and by a low pass skew symmetry filter, the center is at 7 megahertzes or similar digital filter.So the high resolution information relevant with horizontal direction is folded into 5 to 7 megahertz or high fdrequency components of the baseband signal of passing through around a diagonal angle axis that is positioned at 7 megahertz places.In fact, be to have replaced angle information with high resoluting information.
According to transmitting device of the present invention, the digital diagonal angle filter of encoder can comprise independent level and vertical filter.If the horizontal filter complexity is to the decay that is enough to obtain a 40dB in stopband, the vertical filter in the transmitter can be done very simply.For example, the horizontal filter of transmitter (allows 0-5MH
zPassband) on complexity, can have 16 coefficients.Allow to see a kind of like this result the very simple vertical filter that except in transmitter, being used for diagonal angle filtering that is exactly, owing to adopted the horizontal filter of a complexity in transmitter.In receiving mutually, can adopt one to be dirt cheap and simple diagonal angle filter.Particularly, a 5MH in the receiver
zLow pass filter only needs to comprise 8 coefficients.Though the present invention describes by improving the luminance level definition, this technology and device also can be used for improving the horizontal definition of colourity.
A kind of embodiment that improves the colourity horizontal definition has used the principle similar with improving the luminance level definition.But, for the B-MAC signal, have been found that with better simply technology implementation colourity transmission the horizontal chrominance resolution of increase consciously is unwanted because allow.
A vertical filter inserter receives a kind of 525 row at its input, 1: 1 non-interlaced signal, a kind of 1050 row, 2: 1 interlace signal or a kind of 1125 row, 2: 1 interlace signal.This signal is in vertical direction by suitably filtering, and provides one to output to a row of 4: 1 and remove circuit.Output about centre frequency on horizontal direction that row is removed circuit is 2.5MH
zThe filtering of filter, and the high-frequency signal output sampling offered a blender.This blender is with colourity, and brightness and all data/audio signal are mixed for transmission.But, before transmission, the high definition B-MAC signal of mixing can be 10.7MH by a center frequently
zThe skew symmetry filter segment, the skew symmetry filter is partly eliminated obscuring in the decoded signal in conjunction with the complementary filter in the decoder.Thereby the same skew symmetry filter segment in the encoder can be brightness and colourity is handled shared.
Fig. 1 is the diagram that is used for a vertical horizontal definition of high-definition TV signal.
Fig. 2 represents an orthogonal sampling grid, is used at 28.6 megahertzes (with the 8F after the 9 megahertz pre-filterings
SO) to the signal sampling among Fig. 1.
Fig. 3 is the curve chart of level one vertical definition, is the result who has adopted the orthogonal sampling grid among Fig. 2, forms a repetition frequency spectrum identical with baseband frequency spectrum in the sampling frequency center.
Fig. 4 is a vertical horizontal definition curve chart that comprises angle information, from the orthogonal sampling frequency spectrum of Fig. 3 filtering one group of data between 5 to 9 megahertzes for example.
Fig. 5 represents by abandon the 14MH that sampling alternately forms in interlacing
zThe sampling grid, and obtain 5 shapes or cinquefoil sampling figure.
Fig. 6 is result's the figure that expression abandons alternate sampling, except at 28MH
zOutside the repetition frequency spectrum at place, at half initial sample speed 14MH
zThe place has caused that two are repeated frequency spectrum.
Fig. 7 a is an illustrated vertical horizontal resolution figure, is used for being illustrated in an approximate 7MH
zCentre frequency near filtering, this filter has a skew symmetry lowpass response, Fig. 7 b is the amplitude-frequency response curve.
Fig. 8 is the diagram of the first step of receiver complete process.By at 14MH
zThe place uses 5 point ﹠ figure charts shown in Figure 5 to sample again, and folding high-resolution level directional information is reverted to high frequency.Fig. 8 a represents vertically-first diagram of horizontal definition, and Fig. 8 b represents second diagram of amplitude-frequency, it demonstrates to obscure and how to be eliminated, and near 7MH
zInformation be how by the skew symmetry characteristic regeneration of filter.
Fig. 9 is the diagram of vertical-horizontal definition, demonstrates from the result of 14 megahertz to 28 megahertz up-conversions.When diagonal angle filtering, one zero district appears in the high diagonal frequencies in the 5-9 megahertz range, and stay a signal with horizontal resolution, but be inconspicuous the loss of angle information.
Figure 10 is the schematic diagram that is used for the transmitter installation of high definition B-MAC television signal coding.
Figure 11 is the schematic diagram that is used for the receiving system of high definition B-MAC television signal decoding.
Figure 12 comprises coefficient data.Shown in Figure 10, the diagram of one the 16 horizontal low-pass filter characteristic response of coefficient.
Figure 13 is shown in Figure 11, comprises the diagram of horizontal low-pass filter characteristic response of one 8 coefficient of coefficient data.
Figure 14 be with the corresponding to vertical resolution of each image height with respect to the diagram of the corresponding to horizontal resolution of each image width, it demonstrates with conventional method and combines, but in B-MAC, use distinctive scan conversion row doubling techniques, with polynary the expensive characteristic of using in one the 1125 capable MUSE signal transmission system that memory technology is compared.
Figure 15 is in present technique, adopts three filters; Diagonal angle filtering, the amplitude-frequency of pre-filtering and skew symmetry filtering and the diagram of level-vertical resolution, Figure 15 a is an amplitude-frequency, Figure 15 b is vertical-horizontal resolution.
Figure 16 is and the diagram of the two-dimensional silhouette response of Figure 14 transmission signals relatively that in a system, horizontal resolution is converted into angular resolution according to the present invention.
Figure 17 is according to the block diagram of the present invention at the brightness processed circuit at high-resolution B-MAC encoder place.
Figure 18 is according to the block diagram of the present invention at the chroma processing circuitry at high-resolution B-MAC encoder place.
Figure 19 is according to the processing block diagram of the present invention at high-resolution B-MAC decoder place.
Figure 20 is a block diagram of handling the high definition television receiver of Figure 19 middle high-resolution B-MAC decoder output.
Figure 21 is the block diagram that the high-definition television receiver of multiple application is arranged in high-resolution or standard resolution television environment.
Referring to Fig. 1, illustrate according to vertical-high-definition TV signal that horizontal resolution is drawn.
This method that adopts according to Fig. 1 is applicable to 16: the 9 the ratio of width to height images of high definition that use 525 row to line by line scan, and the horizontal resolution at 9 megahertz places has 945 row at least.Such progressive-scan signal provides 480 row vertical resolutions.
As input, is example introduction with reference to a kind of novel B-MAC signal with sort signal, and it can be loaded with the resolution that has improved in the very little scope of diagonal angle resolution loss.Yet it can be used for other MAC colour television system video signal transmission system too.The resolution that increases is folded into the video high frequency.Be lower than 5MH
z(when axial compression is contracted in MAC the time is 7MH at the base band frequency place
z) can not change frequency spectrum.Because the B-MAC decoder of knowing has a logical 6.3MH that is limited to of band
zThe low pass input filter, the influence of the transmission information that decode operation can not be added.On the other hand, folding level detail information is recovered decoding, and produce the high-resolution picture that shows by receiver according to B-MAC decoder of the present invention.
The TV signal of standard resolution 525 row interlacing in 2: 1 respectively comprises 240 fields of effectively going by two and constitutes.Row every one (odd number) field has the skew in space with respect to the row of even field, so that all 480 effective row fitly are configured on the display screen.
Say that in principle this capable structure can provide the resolution of one 480 row for still image, yet the interlacing of standard demonstration can not obtain this value.In fact reason just is that every only shows 240 row, and the eye/brain of wishing the people gets up two occasions and feels all 480 capable, and this can not ideally accomplish.When arriving for second (late 1/60 second), first the density of being felt by eye/brain has been reduced to 50% of its initial value.Two consequences are so just arranged:
(ⅰ) in demonstration, can see capable structure.
(ⅱ) surpassing 240 frame frequencies of going partly has been confused in demonstration.
Final result is, is the interlacing demonstration of 525 row for a standard resolution, and the vertical resolution that the people felt is between 480 row and 240 row.The following vertical resolution of 480 row adopts a notion that is called " Kell coefficient " to describe usually:
The resolution of feeling=480 * 0.66(Kell coefficient)=320 go
For still image, the cancellation fully of Kell coefficient, and by in each 1/60 second field duration, show all 480 row (from the odd and even number field both) make resolution return to 480 row.This technology is called as scan conversion.This The Application of Technology comprises the field storage storage that uses all 240 of storages effectively to go.Be used on the scene and between mobile message, and show by the twice of normal line frequency.Yet owing to can take place between on the scene and the field significantly to move, this method only can be used for visual stationary part.Therefore, also need a moving detector, can be used for stationary object, and the row insertion is used for mobile object so that make interpolation field go into method.The scan conversion technology adopts adaptive field storage row doubling techniques, thereby makes still image obtain 480 row vertical resolutions, and the dynamic area of moving in image obtains approximate 320 row vertical resolutions.
Field storage row doubles to have obtained affirming of television manufacturer as a kind of standard method that increases vertical resolution.Its major advantage is can eliminate the row structure and improve image quality significantly, and need not any additional transmitted information.Some television set and projector manufacturer use the capable doubling techniques of monopolizing, and comprise Philips, Hitachi, and Sony, IRegami etc., its tangible advantage has:
1, this technology similarly is applicable to from any signal source, comprises component signal (brightness, colourity) or NTSC signal that S-VHS VCRS receives.
2, this technology is used in the television receiver, therefore, and allow retention 525 interlacing television sets (NTSC or broadband Y/C).
3, the field storage in the TV image emitter can be used for other user function, and for example imaging in the image, and noise reduces.
4, this technology does not need additional transmitted information, and makes any high definition TV (HDTV) standard can concentrate the problem of being devoted to increase horizontal definition.
The exercise question that proposes together simultaneously at Christopher Birch and this paper is " improving the method and apparatus of TV signal vertical definition with scan conversion ", application on October 11st, 1988, in the u.s. patent application serial number 255328, a kind of technology of improving the vertical resolution of TV signal has been described, the a plurality of insertion values that replace that are used to show have been used, and according to the light and shade to TV signal, the test of motion and vertical boundary transition determines a particular value selectively.
In order to solve the problem that increases horizontal resolution, existing high definition MAC system adopts inferior Nyquist (Sub-Nyguist) sampling (spectrum folding) to change angular resolution, is used to increase horizontal resolution.This process will be described in conjunction with Fig. 2 to 9, and the equipment in transmitter or the receiver will be described in conjunction with Figure 10 to 11.Whole frequencies of being quoted (bandwidth and sampling frequency) are the unpressed luminance signal of a B-MAC signal of reference all.The time axial compression equivalent bandwidth and the sampling frequency that contract in (MAC) zone must increase a 1.5(3: coefficient 2).
At first use a low-pass analog filter that the luminance signal limit of 525 row interlacing in 2: 1 is brought to 9MH
zWith reference to Figure 10, this filter is called as 8.7MH
zPrefilter.This bandwidth (BW) is enough wide to obtain the 945 row horizontal resolutions of each image width (PW), is calculated as follows:
OK/PW=BW * (effectively row)/(total line number) * 2/ (line frequency)=945 row/PW
The initial utilization of this signal orthogonal sampling grid as shown in Figure 2 is at 28.6MH
z(8F
SO) go up and sample.The orthogonal sampling result, according to Fig. 3, baseband frequency spectrum and repetition frequency spectrum are centered close to sampling frequency place as a result.Baseband frequency spectrum is reaching 9MH
zOr 945 row place comprise the horizontal resolution composition.As above-mentioned calculating.
Then, reduce diagonal frequencies response (step 2) with a diagonal angle digital filter.For for simplicity,, adopt level and vertical filter separately as describing below in conjunction with Figure 10 and 11.Referring to Fig. 4, can see that diagonal angle (level-vertical) block of information at the line frequency place between 5 to 9 megahertzes in baseband frequency spectrum and the repetition frequency spectrum has been eliminated.
Now, remove sampling at interval, at approximate 14MH
z(4F
SO) on stay the next one " 5 shapes " (quincunx) sampling figure, do not obscure and do not produce.According to Fig. 5, the interval sampling in the interlacing has been removed.
The result of step 3 is digital sampled sequences, now has intensive 2-d spectrum shown in Figure 6, has the repetition frequency spectrum at the 14 megahertz sampling frequency places that abandoning of alternate sampling used in the step among the figure.
Before transmission, horizontal resolution rectification information is folded into transmission signals.For example, sampling can be converted into analog form, and by a transmission filter with property.This analogue transmission filter is at 7MH
zTime has-the skew symmetry low-pass filter response of 6dB.Its result is shown in Fig. 7 a, and the high resolution information that moves 7 to 9 megahertzes goes to fill up the vacancy that is formed by diagonal angle filtering.Then, can adopt a digital onrecurrent (non-recursive) filter to alleviate the requirement of D/A switch, or upconvert to the sampling of 28 megahertzes, as mentioned below.
In fact, 7MH
zTo 9MH
zBetween horizontal resolution at 7MH
zNear be folded, and replaced 5MH
zTo 7MH
zBetween to angular resolution.Shown in Fig. 7 b, at 7MH
zThe filtering characteristic response attenuation 6dB at place.We see with in MAC colour television system (MAC) transmission since the time axial compression the contract reason of coefficient (3: 2), transmission filter is at 115 * 7MH
zNear be antisymmetric.Signal is prepared transmission now.This can think step 5.
When receiving this signal, sample figure with 14MH with interlacing plum blossom (5 font)
zTo this signal (step 6) of sampling again.According to Fig. 8 a, rely on the sampling again of 14 megahertzes, high-frequency information is transferred to 7-9MH
zThe place.
Again sampling process has been recovered 7MH like this
zWith 9MH
zBetween horizontal energy.Referring to Fig. 8 b, if the transmission filter that provides in conjunction with the decoder operation has skew symmetry response A+(A-1)=1,7MH
zNear decay in transmission filter also can compensate exactly with obscuring an A.In other words, at close 7MH
zNo matter the place is to measure amplitude A in solid coverage area or in the dotted line overlay area, and obscuring of introducing need disappear.
The frequency spectrum of Fig. 8 is used for representing the 14MH of cinquefoil sampling
zThe frequency preface, remaining work is exactly to upconvert to 28MH
z, adopt a two dimensional filter to remove remaining diagonal angle energy, and the signal limit brought to 9MH
z
At 14MH
zCan not realize diagonal angle filtering under the sampling rate, (it is at 5-9MH
zVertical frequency high in the scope produces a vacancy).Therefore, sampling rate is upconverted to 28MH
zIt is the part of digital filtering process.According to Fig. 9, up-conversion and diagonal angle filtering cause a vacancy at the diagonal frequencies place, and have improved horizontal resolution.
On the other hand, above-mentioned sampling can directly be added to one known but distinctive, be used for the field storage scan converter that row doubles, so that increase vertical definition.As proposing simultaneously by Chrislopher Birch and the application, be entitled as in No. 255328, the U.S. Patent application of " utilizing scan conversion to improve the method and apparatus of TV signal vertical definition " and described a kind of like this device, can draw herein and do reference.The result of scan conversion be one at 56MH
z(2 * 28MH
z) 525 row continuous sweep signals of sampling, and have up to 18MH
zHorizontal luminance resolution.(this row doubles work to be reduced effective line period half and sampling frequency and video bandwidth is all doubled).
Said method will be distinguished encoder in linking frame Figure 10 and 11 apparatus of the present invention of narrating as following, for the MAC colour television system signal transmission system provides a kind of very effective means.
The transmitter installation of Figure 10 carry out remove in the said process the transmission in steps:
And
Though can see that diagonal angle filtering must be with 28MH
zSampling rate is finished, but the work that in fact will abandon sampling in step 3 can be simplified.Figure 10 represents a structure chart, and wherein the key link of digital filtering can be at 14MH
zFinish under the sampling rate.
Diagonal angle filtering is finished by two (level is with vertical) filters that separate.Learn that now vertical filter can be very simple, just, offer the row memory 101 of horizontal filter 103 and adder 102 can be finished about 40dB in the band resistance decay.In order to reach such decay, horizontal filter 103(5MH
zLow pass) at 28MH
z16 coefficients of Shi Caiyong.Horizontal filter is designed to the symmetrical nonrecursive filter that a usefulness 9 potential coefficient values are optimized.Figure 12 shows the response and the coefficient of this filter.
According to Figure 10. switch 100 is the 28MH after the pre-filtering
zThe sample of alternately believing of sampled signal inserts two 14MH
zPath.According to last path, this sampling is by vertical and horizontal filtering.Adder 102 places from deduct underpass the path, simultaneously adder 104 places on path be added on the underpass.Input at filter 103 presents a low pass pectination characteristic, and its energy at the zero frequency place is zero; Simultaneously presenting one at the output of adder 104 has energy at the zero-frequency place, and extends to 9MH always
zLow frequency pectination characteristic (solid line), and one from 5MH
zUpwardly extending high frequency aliasing characteristics (dotted line).Result at adder 105 outputs is that a horizontal resolution is folded to 5-7MH
zThe signal that can be used for transmitting in the scope.For each a
4, b
4It is right to sample, and uses 14MH as shown in the figure
zSeparately, stay next signal sampling the cinquefoil sampling from interlacing, next, owing to abandoning of alternate sampling, at 14MH
zThe place has finished 28MH
zWork of treatment.
Figure 11 represents decoder, also can be implemented in 14MH in it
zOn digital filtering.In this case, 5MH
zLow pass filter 111 only contain 8 coefficients, its characteristic response and coefficient data are as shown in Figure 13.
According to Figure 11, according at 14MH
z5 shape sampling figures shown in going up are to 14MH
zInput signal sampling.The last path of this decoding signals also comprises adder 112 and row memory 113.Underpass also comprises and inserts circuit 114, and it comprises signal component and postpones D and equilibrium (than two divided-frequency) circuit, the data of losing in the figure that is used for recovering sampling.At 28MH
zOn, upper and lower path is become up-conversion by switch transition, and in adder 115 places addition.
Figure 14 represents the idealized two-dimentional frequency response that obtained by this system, with the comparison of the high definition 1125 row muse systems of Japanese Broadc asting company (NHK) exploitation.Muse system uses a plurality of memories.Therefore, than the costliness of the present invention that contains the scan conversion apparatus that uses a field memory many.However, concerning dynamic or still image, horizontal resolution of the present invention is equal to or is better than muse system significantly, and the scan conversion of use almost can be compared with muse system aspect vertical resolution.
Figure 15 represents to use the real response of above-mentioned filter acquisition, and according to Figure 15 a, the position of folding energy (shadow region) is illustrated in the scope.In Figure 15 a and 15b, A is relevant with the filtering of encoder diagonal angle, and B is relevant with pre-filtering, and the corresponding skew symmetry filtering of C.According to said method, skew symmetry transmission filtering can be finished with analog form.According to said apparatus,, just needn't upconvert to 28MH if can use a symmetrical nonrecursive filter to produce the skew symmetry response with a digital filter in turn to produce ideal linearity phase umbrella characteristic
zSampled.Required digital filter is in that all replace coefficient and all should have zero point except that central point, and therefore causes a 14MH
zImplementation.If (sampling that replaces just needn't be used 28MH along with the zero coefficient that replaces is automatically removed
zExecution handle, can handle individually central term).Figure 15 has supposed to use the nonrecursive filter of one 16 coefficient.
Figure 16 represents the two dimension response with the reality of native system acquisition.Compare as seen with Figure 14 from Figure 16, being that the horizontal resolution that cost is improved reaches 945(950 to angle information) OK.According to the foregoing description and method, improved the horizontal resolution of brightness, and improved vertical resolution too with the method for scan conversion.Consider compressions in 3: 1 of the U/V chroma data in the interlacing transmission row, the present invention also can be used to improve the horizontal resolution of colourity.In order to obtain the improvement of colourity vertical resolution, adopted the scan conversion technology.But, to B-MAC, it may be unnecessary deliberately improving chroma resolution.
Though the detail drawing of high-resolution B-MAC transmitter and receiver is with reference to Figure 10, Figure 11 has carried out describing respectively, incites somebody to action the processing of lightness furtherly and colourity with reference to Figure 17-19.
Referring to Figure 17, show the circuit block diagram that is used for brightness processed at encoder position, this circuit is worked with the circuit that is used for the colourity processing at same encoder position.According to Figure 17 and Figure 18, each handles path sharing one skew symmetry filter segment 1710.
According to the present invention, provide 525 row 1: 1 discontinuous scanning to vertical filter/insertion circuit 1701,2: 1 interlaced video luminance signal of 2: 1 interlacing scan of 1050 row or 1125 row.Thereby produce the static vertical resolution of 480 row.Resemble and be illustrated, remove alternate row at remover 1702 places, forms 2: 1 525 capable interlace signals and supply with diagonal angle filter 1703.Then the 28MH of diagonal angle filter
zSampling output supply with the just removal alternate sampling of removing circuit 1704, remaining 14MH
zThe plum blossom shape sampling structure of sampling rate.The sampling that forms is stored in the memory and with different speed reads, thus the time axial compression contract and realize that the sampling in 3: 2 on the time domain compress in the circuit 1705.Then, axial compression is contracted to sample and is mixed for transmission with colourity and any data/audio signal in blender 1706 time.The shared skew symmetry filter segment 1710 of the luminance and chrominance information of handling.
Referring to Figure 18, remove recognize that the U/V component signal is transmitted in every line outside, colourity is handled and to be similar to brightness processed, and makes according to the B-MAC transmission, colourity is compressed with 3: 1 ratio usually.Thereby in standard interlacing or not interlacing, the colourity input that number number is identical as luminance signal, is fed into vertical filter/inserter 1 801.To be implemented in action attitude of 120 on the image height or the static chroma resolution of 180 row.In the horizontal direction, the chroma resolution that has reached can be up to the row of 300 on the picture width.Because processed in every line, the row that is used for U, V component is removed circuit with 4: 1 ratio work.It is 2.5MH that the output of row removal circuit is sent to centre frequency
zHorizontal filter 1803.Then, the colored sampled signal output of the high frequency of horizontal filter, the time axial compression axial compression of contracting in the circuit 1804 when carrying out with 3: 1 according to the B-MAC transmission standard contract, afterwards, colour signal is mixed for transmission, be that U and component mix with luminance signal in blender 1706, and carry out the interlacing transmission with the audio frequency of sending into blender 1706 or data channel by the B-MAC standard.But, need point out once more that in Figure 18, same skew symmetry filter segment 1710 can use on the composite signal before transmission.
See Figure 19 now, show an embodiment of this definition B-MAC signal processing that comprises brightness and chrominance information.According to the present invention, complementary symmetrical filter segment 1901 is with 10.7MH
zReceive the HMB-MAC signal.Thereby, eliminated obscuring of composite signal.The output of complementary skew symmetry filter 1901 is with 21MH
zSpeed sampled, and be sent to brightness processed path and colourity and handle path.The result has formed the quincunx structure of five-point type.Brightness sampling the time carry out 3: 2 time axle expansion in the axle expanded circuit 1902.Then output is delivered to diagonal angle filter/inserter level 1903, the latter provides one to have the numeral output of losing alternate sampling replaced in alternate row.
According to the colourity path, the time axle expanded circuit 1904 in colourity sampling axle expansion when carrying out with 3: 1, with 7MH
zTime axle expansion sampling deliver to vertical filter/inserter 1905, thereby provide available R-Y to export with B-Y colourity.These are can be in modulator 1906 modulated and be added to a shared digital analog converter 1907, so that brightness and colourity output Y and C are provided or respectively output are offered the high-definition TV receiver device.
A kind of block diagram of high-definition TV receiver is shown in Figure 20.Output from the brightness of Figure 19 decoder sampling 4 is input to high-definition receiver along independent R-Y and B-Y input.Shown in block diagram, a kind of scan conversion apparatus 2001 is provided, with field storing apparatus 201, comprise motion detector 2003 and insertion algorithm processor 2004.Being intended that as far as possible promptly provides row to double in vertical direction.It is disclose in 255238 the application the sort of that scan conversion apparatus can use the series number of submitting on October 11st, 1988, is listed in herein as a reference.Store the result who handles with the insertion of relevant time delay owing to need the field, another luminance signal road contains 2005.2: 1 compressor circuit of lagging circuit 2006, and they mix for demonstration with scan converter output in blender 2008 by compressor circuit 2007.
Chrominance information is inserted in vertical inserter 2010 in vertical direction, is compressed in the compressor circuit 2011 at 4: 1, and mixes for demonstration with chrominance input signal in blender 2012.
Referring to Figure 21, express the user side overall picture with the picture form.The high definition B-MAC signal can be received and replace demonstration with the output 2102 or the deposited ground cable TV output 2103 of video video cassette recorder.There is shown a kind of high-definition TV receiver, the user that response enters by selector 2104 selects input, its application had been described, for go the adaptive scanning conversion method that doubles at scan converter 2105, thereby, show that on receiver the ratio of width to height is 16: 9 a high-resolution picture.Air broadcast TV signal 2108 also can receive at tuner 2109 tuning antennas.If desired, decode, and provide demonstration by same scan conversion apparatus 2105 at ntsc decoder 2110.If broadcast singal 2108 is high definition, then need land high-definition decoder 2111.Thereby the user with high-definition TV receiver can improve the resolution of displayed image, no matter the signal that is received is high-resolution, is standard N TSC low resolution, or encode with high or low resolution MAC colour television system standard.
Claims (10)
1, a kind of to high-resolution MAC colour television system TV signal encode for the transmission device, it is characterized in that:
By means of removing predetermined sample, handle the brightness processed device of TV brightness component signal for transmission,
Handle the chrominance processing arrangement of TV chrominance component signal by removing predetermined sample for transmission,
Brightness that mixed processing is crossed and chrominance component signal for the transmission synthesizer, and
The response synthesizer and with the skew symmetry filter segment that a complementary filter partly links to each other, be used for synthesizing signal filtering for transmission.
2, encode for the device of transmission by claim 1 pair high-definition TV signal, wherein the brightness processed device comprises:
One vertical filter is inserted circuit, is used for the vision signal that enters is carried out filtering,
Row in response to vertical filter insertion circuit is removed circuit, with the row that removes separately.
A responsive trip is removed circuit, is used to provide the diagonal angle filter of quincunx video sampling structure, and
Response diagonal angle filter is used for the time compression circuit of compressed video signal sampling for transmission,
3, encode for the device of transmission by claim 1 pair high-definition TV signal, wherein chrominance processing arrangement comprises:
A vertical filter is inserted circuit, is used for the vision signal that enters is carried out filtering,
The row removal circuit of circuit is inserted in a response vertical filtering, and be used for interlacing and remove a U and V component,
A responsive trip is removed the horizontal filter of circuit, is used for carrying out on the frequency of color center filtering, and
The axial compression circuit that contracts in the time of one, its level of response filter is used for 3: 1 the colored sampling of ratio compression high frequency for transmission.
4, a kind of to high definition MAC colour television system TV signal encode for the transmission device, it is characterized in that:
By means of removing predetermined sample the tv brightness signal component is handled for the brightness processed device that transmits,
By means of removing the chrominance processing arrangement that predetermined sample is handled the TV chrominance component signal for transmission, and
A skew symmetry filter segment, its responds brightness processed device and chrominance processing arrangement, and links to each other with complementary skew symmetry filter segment, is used for the multiplexing analog signal component of high definition is carried out filtering, for transmission.
5, a kind of high definition MAC colour television system TV signal that is used for receiving promptly before transmission, has been removed the device that the sampling of scheduled television signal is decoded, and it is characterized in that:
A skew symmetry filtering part, it partly links to each other with a complementary skew symmetry filtering, is used for the TV signal that receives is carried out filtering,
Response skew symmetry filtering part is used for sampling apparatus that the signal of transmissive wave is sampled.
Be used for by inserting the brightness processed device that removed brightness sampling is handled sampled signal, and
The chrominance processing arrangement that the colourity sampling of losing by insertion is handled sampled signal.
6, device as claimed in claim 5, wherein the brightness processed device comprises:
Axle expanded circuit in the time of one, and
Diagonal angle filter and one are used for the inserter of the brightness sampling that recovers to remove.
7, device as claimed in claim 5, wherein chrominance processing arrangement comprises:
Axle expanded circuit in the time of one, and
Vertical filter and inserter are used for the colourity sampling that recovers to remove.
8, a kind ofly link to each other, be used for handling the luminance and chrominance information component so that device shown is characterized in that with high definition MAC colour television system television signal decoder:
A kind of brightness processed road that is used between first and second, inserting owing to mobile detection of moving the brightness sampling that determines and insertion circuit that comprises, and
One comprises a vertical circuit that inserts, and is used for inserting the colourity processing path of colourity sampled signal.
9, device as claimed in claim 8, wherein mobile detection and insertion circuit comprise:
Be used for the pick first video field the field memory, and
The inserter of response moving detector is used for inserting the sampling from the storage video field and the second video field.
10, processing unit as claimed in claim 8 also comprises first, second compressor circuit, is respectively applied for luminance input signal and the mobile output signal that detects and insert circuit that compression lags behind, and
One is used for the synthesizer that the output separately of first and second compressor circuits is synthetic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US27206488A | 1988-11-16 | 1988-11-16 | |
| US272,064 | 1988-11-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1045674A true CN1045674A (en) | 1990-09-26 |
Family
ID=23038248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89109266A Pending CN1045674A (en) | 1988-11-16 | 1989-11-16 | High definition b-mac television signal transmission system |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0571362A1 (en) |
| CN (1) | CN1045674A (en) |
| AU (1) | AU4742090A (en) |
| BR (1) | BR8907776A (en) |
| CA (1) | CA2003136A1 (en) |
| MX (1) | MX171759B (en) |
| WO (1) | WO1990006038A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105407311A (en) * | 2015-11-03 | 2016-03-16 | 青岛海信电器股份有限公司 | Television receiving signal processing method and device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5274464A (en) * | 1991-02-20 | 1993-12-28 | Samsung Electronics Co. Ltd. | Spatial filter for improved VHS system |
| TW208106B (en) * | 1991-02-20 | 1993-06-21 | Samsung Electronics Co Ltd | |
| EP0551979A3 (en) * | 1992-01-14 | 1994-09-14 | Matsushita Electric Ind Co Ltd | High efficiency coding apparatus |
| JPH05260451A (en) * | 1992-02-28 | 1993-10-08 | Nec Corp | Lsi for picture coding processing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5765068A (en) * | 1980-10-08 | 1982-04-20 | Hitachi Ltd | Television receiver |
| JPS58117788A (en) * | 1982-01-06 | 1983-07-13 | Hitachi Ltd | Color television signal processing circuit |
| JPS6048690A (en) * | 1983-08-27 | 1985-03-16 | Nec Home Electronics Ltd | Sequentially scanning converting device |
| US4621287A (en) * | 1984-05-29 | 1986-11-04 | Rca Corporation | Time-multiplexing of an interleaved spectrum of a television signal |
| US4831463A (en) * | 1987-01-30 | 1989-05-16 | Faroudja Y C | Video processing in which high frequency luminance components are folded into a mid-band spectrum |
-
1989
- 1989-11-16 BR BR898907776A patent/BR8907776A/en unknown
- 1989-11-16 AU AU47420/90A patent/AU4742090A/en not_active Abandoned
- 1989-11-16 WO PCT/US1989/005044 patent/WO1990006038A1/en not_active Application Discontinuation
- 1989-11-16 CA CA002003136A patent/CA2003136A1/en not_active Abandoned
- 1989-11-16 EP EP90901153A patent/EP0571362A1/en not_active Withdrawn
- 1989-11-16 CN CN89109266A patent/CN1045674A/en active Pending
- 1989-11-29 MX MX018521A patent/MX171759B/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105407311A (en) * | 2015-11-03 | 2016-03-16 | 青岛海信电器股份有限公司 | Television receiving signal processing method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| MX171759B (en) | 1993-11-12 |
| EP0571362A4 (en) | 1992-03-19 |
| WO1990006038A1 (en) | 1990-05-31 |
| EP0571362A1 (en) | 1993-12-01 |
| CA2003136A1 (en) | 1990-05-16 |
| AU4742090A (en) | 1990-06-12 |
| BR8907776A (en) | 1991-08-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |