CN1046827A - Adopt the television system of a plurality of transmission channels - Google Patents

Abstract

From the TV signal of wide frequency band screen high definition TV (HDTV) source output, through two traditional type NTSC channel transfers.Main channel signal (115) comprises and can and expand sharpness information with the coding wide screen of existing ntsc television machine compatibility.Auxiliary channel signal (130) increases main channel signal, and comprises and represent the main channel to transmit information and from signal difference between HDTV source information (△ S) information.Two channel signals (132,134) are received the back by the HDTV receiver and produce HDTV image (136).

Description

Adopt the television system of a plurality of transmission channels

The present invention relates to a kind of TV signal processing system utilizing which of utilizing an above transmission channel transmitted image information.Specifically, the present invention relates to the device that carries out the encoding and decoding processing in order to the auxiliary channel information that strengthens main channel information.

The shown image of the television receiver of traditional type (for example) according to the television receiver of the NTSC broadcast standard manufacturing of the U.S. and other various places employings, its ratio of width to height is 4: 3(is the width and the height ratio of shown image).Recently, use higher the ratio of width to height (for example: 2: 1 or 16: 9 or 5: 3) person of taking up increasing for the panavision receiving system, because, utilize 4: 3 shown the ratio of width to height of higher the ratio of width to height and traditional type television receiver to compare, the former is more approaching or equal the ratio of width to height of human eye visual field.But, if wide-screen television system only can be launched the ratio of width to height signal higher than traditional type system, then this kind signal can not with the receiver compatibility that adopts traditional the ratio of width to height.

So, must have a kind of can with the wide-screen television system of traditional type television receiver compatibility.The more important thing is, must make these wide screen systems possess the function of strengthening or expanding the definition of shown image, thereby the more images detailed information this width-screen EDTV of can be provided. (expansion definition television) system; By the BC-33 of the people Yu Yijiu such as M.A.Isnardi publication in December, 807 volume " Institute of Electrical and Electronics Engineers broadcasting industry report " " IEEE Transactions on Broadcasting ") in deliver it and " promote the coding method of compatible and image repetition in the ACTV system " " Encoding for Compatibility and recoverability in the ACTV System ") in the literary composition, and in the 34th volume " the IEEE consumer electronics is industrial to be reported " (" IEEE Transaction on consumer electronics ") of in February, 1988 publications, deliver in detail explanation in it " decoding processing problem of ACTV system " (" De coding issues in the ACTV System ") literary composition.

High definition TV (HDTV) wide screen system all uses two passages usually.Utilize two channel transfer wide screen HDTV information, one of its advantage is addressed in the 252nd, No. 340 U.S. Patent application (apply for a patent name and be called " the expansion definition widescreen television system that uses whole signal transmission passage ") by people such as M.A.Iisnardi.The high definition wide screen system of a kind of two passages of explanation in this patent application specification, the compatible main channel of NTSC wherein system encodes with the additional images detailed information that reaches described in people's papers such as wide screen information and above-mentioned Isnardi; Accessory channel wherein then contains can be in order to expand the information of the contained information in main channel.Relevant main channel signal coding techniques, J.S.Fuhrer proposed be entitled as " compatible television system " with auxiliary signal coded message compand function the 139th, in No. 339 U.S. Patent applications, and M.A.Isnardi proposed be entitled as " expansion definition widescreen television signal processing system " the 139th, in No. 340 U.S. Patent applications, detailed explanation is arranged all.

This specification is thought, a kind of two channel width screen HDTV systems should be provided, make it possess a digital auxiliary channel, and the contained signal message of this passage system is through the information of digital compression processings in this wise, and feasible can the minimizing may come noise signal outside can be visual because of audience that data compression process took place.Therefore, according to the principle of the invention, before carrying out the digital data compression processing, with the auxiliary digital signal coding, it is a plurality of to contain the subband signal composition of image edge information that it is separated into earlier.

The present invention system is implemented in the wide screen high resolution system, and this system is via a compatible main channel of a NTSC and an auxiliary channel transmit signal that expands.Main channel system utilizes wide screen and additional detail reinforcement information coding according to the open method of people such as above-mentioned Isnardi.Accessory channel then transmits the difference signal that the information differences is transmitted in the original high definition video signal source information of a kind of representative and main channel.

Fig. 1 is the block diagram of one or two passage television signal transmission system, comprises the encoder apparatus according to the present invention's design.

Fig. 2 is two passage receiver decoder configuration block diagrams relevant with Fig. 1 system.

Fig. 3 and Figure 4 shows that the encoder apparatus block diagram that is used in the accessory channel.

Fig. 5 with Figure 6 shows that receiver in the decoder device block diagram relevant with accessory channel.

Fig. 7 with Figure 8 shows that each filter freguency response curve chart relevant with Fig. 6 device with Fig. 4.

Among Fig. 1, from a signal source 110(video cameras for example) wide screen (for example: 16: 9 width than) high definition TV (HDTV) signal Y, I and Q, be applied to a transmitter 112.Signal Y contains luminance picture information, its horizontal frequency band range be 0 hertz to 20 megahertzes, and the colourity image information is contained in signal I and Q system, its horizontal frequency band range be 0 hertz to 10 megahertzes.

Signal Y, I and Q give encoding process by a single channel encoder 114, and encoder type illustrated in this encoder and the people's papers such as above-mentioned each patent application and Isnardi is identical.After the signal encoding, by an antenna 115 emissions.The signal of being launched is received by the antenna 120 of a traditional type NTSC receiver 122, and simultaneously, the antenna 124 that is expanded definition television (EDTV) receiver (comprising a wide screen displays 128) by a wide screen is received.The width-screen EDTV receiver comprises that decoder type said in people's papers such as a single channel decoder 125(and above-mentioned each application for patent and explanation Isnardi is identical), in order to the signal decoding of institute's reception is expanded definition brightness and chromatic diagram signal Y, I and the Q as composition for constituting, and on width-screen EDTV display 128, show these signals.

The system of Fig. 1 also comprises an accessory channel encoder 142 in addition, comprising disclosed subband encoder and digital data compression device.Represent the shown wide screen EDTA signal message of wide-screen receiver 128 and, give encoding process by encoder 142 from the signal of original the two differences of wide screen HDTV signal message of signal source 110.Signal Y ', the I ' of 140 outputs of subduction single channel decoder and the method for Q ' get signal Y, I that this difference signal system is provided from signal source 110 and the Q.Single channel decoder 140 can be identical with decoder 125 types.The auxiliary television signal △ S of encoder 142 outputs is by antenna 130 emissions.

By the auxiliary difference signal of antenna 130 emissions with by the main signal of antenna 115 emissions, received by the antenna 132 of wide screen HDTV TV receiving system.This television system comprises a pair of channel decoder 134, in order to main signal and auxiliary signal are decoded, and the brightness of the back of will decoding and colourity formation signal plus, to produce wide screen HDTV composition signal Y ', I ' and the Q ' that is fit to 134 demonstrations of wide screen HDTV display.According to the counter element of the encoder 142 and the decoder 134 of the present invention's design, will be in it hereinafter is discussed.

Fig. 2 is a kind of example configuration block diagram of binary channels decoder 134 shown in Figure 1.Antenna 220 is coupled to tuner 202 and 222, and these two tuners are the radio-frequency channel and the radio-frequency channel of transmitting auxiliary signal △ S of tuning transmission main signal respectively.Single channel decoder 204 produces Y ', I ' and Q ' signal composition with the main signal decoding back of tuner 202 generations.Decoder 204 can adopt illustrated same mono channel decoder in people's papers such as aforementioned each patent application and Isnardi.Auxiliary signal decoder 206 comprises the quantification network, produces the enhancing colour difference xor signal △ I ' and the △ Q ' of highlight difference signal △ Y ' and the quantification back that quantize the back after the auxiliary signal △ S of self-tuner 222 decodes in the future.After a while, in hereinafter going through the auxiliary signal decoder.Signal △ Y ', △ I ' and △ Q ' respectively via adder 208,210 and 212 with the scanning signal Y ', I ' and Q ' (by 204 outputs of single channel decoder) continuously and mix of every frame 525 row after, produce the alternate-line scanning signal Y ", I " and the Q of every frame 1050 row ", deliver to the wide screen HDTV display 136 of Fig. 1 then.Display 136 can adopt traditional type 525 row to scan display continuously, is subjected to a field frequency signal controlling, with 1/2nd of every displacement of 525 display lines interlacing scan space, to reach the effect of 1050 row alternate-line scannings.

Detailed description in people's articles such as each patent application and Isnardi as described above, the compatible signal of coding back NTSC of main channel transmission comprises three kinds of signal compositions.In brief, first composition signal in three signal compositions is to be 2: 1 interlacing baseband signals of every frame 525 row, and has 4: 3 the ratio of width to height of standard.This signal composition comprises from heart panel information among the original wide screen signaling source, after temporal extension is handled, almost occupies the whole period of the scan line that works.This first signal composition also comprises the horizontal low frequency information of side screen in addition, and the horizontal image that this information time of having passed through is compressed into standard NTSC receiver display 122 left and right sides is crossed and scanned in the district.Lower frequency side screen information does not show this signal because of standard TSC-system receiver, so the audience also can't see.This first signal composition is handled by frame inner average earlier with before the second and the 3rd signal composition mixes, make its frequency greatly more than 1.5 megahertzes.

The secondary signal composition is a kind of by 2: 1 interlacing Base Band auxiliary signals that derive in the original source signal, the panel left and right sides high-frequency information except that low frequency information wherein, be the elapsed time extension process after, occupy work scan half of capable period.Therefore, in fact side after temporal extension screen high-frequency information occupies whole periods of the scan line that the secondary signal composition works.

The 3rd signal composition is auxiliary with 2: 1 interlacing baseband signals by what derive in the original source signal, and is included in the horizontal luminance detail information of extra high frequency in about 5.0 megahertzes and 6.0 megahertz range.The frequency of this information is reduced in 0 to 1 mhz band.

The second and the 3rd signal composition each through frame inner average handle and amplitude compression after, relevant each of modulation orthogonal phase place suppresses back intermediate subcarrier signal respectively again.The frequency of each intermediate subcarrier signal (for example being 3.108 megahertzes), for horizontal line scans the odd-multiple of frequency 1/2nd, and in the chrominance band scope of NTSC base-band signal spectrum.In addition, the phase difference that each intermediate subcarrier signal is adjacent two is 180 °, and each system limits it by the cycle that 262 levels scan row.Therefore, the phase place alternation mode of intermediate subcarrier signal is different with the phase place alternation of NTSC chrominance subcarrier signal.Intermediate subcarrier signal after the quadrature modulation mixes with the first signal composition of process frame inner average processing, and it mixes the composite signal of back, in order to the radio frequency image carrier of modulation by main channel antenna 115 broadcastings among Fig. 1.

Auxiliary difference signal △ Y, △ I and △ Q are encoded and are compressed by a kind of digital subband coding of unit 142 usefulness and data compression process (hereinafter it will be discussed).Difference signal △ Y, △ I and △ Q should be numeral (binary system) form, and comprise quite low-yield high-frequency information after handling through prior analog/digital conversion.In this example, main channel signal system is broadcast with analog form by antenna 115.

Device shown in Figure 3 is suitable for the accessory channel encoder 142 among Fig. 1.Luminance difference signal △ Y is applied to a Quadrature Mirror Filter QMF (QMF) 312, and signal △ Y is separated into four spatial frequency subbands that separate.These four frequency band differences are LL frequency band (low-level and low vertical frequency band), LH frequency band (low-level and high vertical frequency band), and HL frequency band (high level and low vertical frequency band) is with HH frequency band (high level and high vertical frequency band).Each frequency band is represented the energy that occurs among this particular space frequency band difference signal △ Y respectively.

Comprise level with one, the image object of vertical and oblique line marginal information, the information relevant with the LL subband is represented the fuzzy image of this object, and the information relevant with the HH subband with LH, HL, then represents level, vertically and the oblique line marginal information respectively.LH, HL and HH frequency band respectively comprise flat field information image edge information in addition.Each frequency band earlier according to the data of pre-defined algorithm, was quantized by quantizer 314a to 314b respectively before being applied to a time multiplexer 313.

△ I and △ Q difference signal are before being applied to multiplexer 313, with the same way as of above-mentioned processing signals △ Y, identical with QMF encoder 312 by a QMF encoder 322() identical with quantizer 312a to 314d with each quantizer 324a to 324d() handled.As mentioned previously, the frequency bandwidth of signal I and Q is 10 megahertzes, or is brightness signal Y 20 mhz band width half.Therefore, difference signal △ I and △ Q are half of the horizontal frequency bandwidth of signal △ Y.For making level, vertically with in the time and space keep identical brightness, and obtain bigger colourity compression, before the subband encoding process, earlier signal △ I is reduced to 1/10th with △ Q by the proportionate relationship of vertical and 2: 1 time colourity bandwidth ratio 2: 1.This is to utilize an input circuit to finish it, and this circuit comprises vertical 1/10th (following down-sampled) circuit 327 that reduces to one 2: 1 of a field switch 325.When switch 325 positions shown in the figure, in the even image field interval, this switch is about to difference signal △ I and is sent to vertical decline sampler 327, and when switch 325 in the another location time, this switch is about to difference signal △ Q and is sent to vertical decline sampler 327.

By the data-measuring effect that each quantizer 314a to 314d is produced in the luminance signal path, be that the digital data compression handling procedure that comprises encoder 315 constitutes one of part.Data compression process is removed redundant data, and therefore, speed that less data bits can be lower transmits, and unlikely resolution to information causes appreciable impact.In this instantiation, the input data that data speed is about 500 megabit per seconds are compressed to the data rate of 20 megabit per seconds, and 6 mhz band width of this and traditional type NTSC television system can be compatible.

Compare with analog data compression process, the advantage of digital data compression is recovered effect for better noiselessness information can be provided at the decoder place, and can be the signal to noise ratio that the low noise signal obtains a remarkable improvement.Put at this point, also find before data compression process, earlier input signal is segmented into four subband LL, LH, HL and HH, the noise that data compression process is produced significantly reduces in the shown image in regeneration back.Handle the system of the not segmentation primary signal in the data compression mode, can not distinguish " smooth " image area and marginal zone.Thereby after receiver was expanded data, the noise that compression is produced when handling will appear within the entire image district.As comparing, the advantage of the data compression system that the present invention is open is to be owing to as mentioned above input signal is separated into several subbands, and can distinguish smooth image area and edge image district.The data compression system that the present invention is open, the main system of its design operates for the marginal information relevant with each frequency band of HH with LH, HL, and therefore, the noise system that is handled generation by compression is relevant with the image border, and when image information was regenerated in the decoder place, its influence was lower.The subband signal relevant with vertical edge information (HL) with horizontal edge information (frequency band LH) is regarded as more important than other signals.The signal relevant with the LL frequency band is for selecting signal for use.For example, can be in order to carrying information reducing the extraneous signal relevant with main channel signal, or be converted to continuously by alternate-line scanning in order to assistance and scan.

Quantification treatment reduces the variation content in the input signal data position so that Huffman subsequently (Huffman) encoder can utilize less data bit in more effective mode with digital coding.The quantification treatment mode that is adopted will be selected it according to the characteristics of signals of a certain system.In this instantiation, four subband signals all are the quantification treatment of accepting same way as, because respectively the characteristic of this band signal and energy distribution state are roughly the same.But,, just need handle each subband signal composition in a different manner respectively according to the needs of this particular system as adopting the subband signal composition of separation.Because quantification treatment is main relevant with marginal information, therefore, the information that may lose during the quantification treatment, the reproduced picture that can't significantly damage the audience and seen.

Quantification treatment is well-known, and relate to input data threshold ratio.In brief, by the pixel element quantity in each subband signal of QMF encoder output be in the original input signal pixel element quantity 1/4th.Each element is an eight bit word, a sign bit is wherein arranged and determine a position more than this element size.Each eight bit word is equivalent to handle through QMF, is reduced to one of 1/10th a backs pictorial element.That is, on this aspect, there is no direct 1: 1 corresponding relation between primary signal pixel element quantity and each the eight bit word pixel element.The size of each element, a palpus and a threshold value compare mutually.Surpass this threshold values as its size, then represent the numerical value of this element size promptly to be replaced by a difference of representing this element size value to surpass this threshold values.Sign bit then remains unchanged.By with this substitution value divided by a definite value and mode that its quotient is rounded, make this substitution value accept uniform quantization and handle.This program can utilize a check table to finish it.

Multiplexer 313 provides an eight bit data to flow to encoder section 315.The quantification back brightness subband difference signal of sending here by each unit of 314a to 314d, with field preface subband aberration xor signal △ I, △ Q from the quantification back of each unit of 324a to 324d, to respectively by a pre-network (not shown), this signal postpones a scheduled volume mutually, so, otherwise develop the luminance and chrominance information of coming out simultaneously, unlikely overlapping during multiplexed processing.From each unit output of 314a to 314b quantize the back signal, the elapsed time is multiplexed to be treated to a series of eight bit words, thereafter with information △ I and △ Q after the field preface quantification of elapsed time multiplexed processings back.

Encoder square frame 315 comprises-huffman encoder that this is a variable-length entropy coder, has structure and the characteristic known, and zero common running length (zero-run length) encoder is arranged before it.Expection is the value data of generation often, is to utilize the short code word to be encoded; And the less value data of expection frequency then is that utilization is encoded than long code word.The encoding process program comprises the check table that utilizes a programming that produces in advance, produces the dateout of coding back with the variation of Input Data word, comprises the nonzero value that quantizes the back and continuous null value.After data input to Huffman encoding after quantizing, through scanning, to check quantification back nonzero value and null value wherein.Because threshold process in the quantification amount 314 and quantification treatment operation, common major part is a null value in above-mentioned each numerical value.All appearance one nonzero value quantized datas produce the output code word of a corresponding programming immediately.When for the first time detecting one zero quantized values, no matter tie up to an image line when beginning or follow closely after the nonzero value, even counter reset.Thereafter, a null value is arranged whenever, this counter promptly increases by one 1.This be each null value it " running " (run), and a nonzero value takes place or a given row at the end stops once running in this.When once running stops, promptly produce one and be equivalent to one of running value (length) output code word.

The purposes of buffer 316 is an interface, make this huffman encoder 315 variable output data rate can afterwards the fixed data rate (for example, 20 megabit per seconds) of the output channel of difference signal △ S be compatible with transmitting multiplexed compression.The output signal of buffer 316 includes the modulator-demodulator 318 of a D/A via one and is sent to this output channel.Output signal △ S is modulated on the suitable radio-frequency carrier, broadcasts via accessory channel broadcasting.Also can utilize other delivery means to broadcast, for example microwave or optical fiber link.

Fig. 4 is the detail drawing of Quadrature Mirror Filter QMF formula encoder 312 among Fig. 3.The QMF encoder comprises two digital FIR(finite impulse response (FIR)s) filter.One of them comprises a horizontal low pass filter 410, and another then comprises a horizontal high pass filter 420.These two filters are complimentary to one another, that is the frequency response of the two system is the center with half Nyquist (Nyquist) frequency, form mirror image image each other.The normalized frequency response curve of these two filters is respectively shown in Fig. 7 and 8.In Fig. 7 and 8, the Nyquist sampling frequency when the 0.5f point is equivalent to the analog image information translation and is digital information.Filter 410 and 420 forms the mirror image image response about half nyquist frequency (0.25f).Low pass filter 410 shows a cut-off frequency at half nyquist frequency place, and high pass filter 420 is the starting point of its band connection frequency with half nyquist frequency place then.

Input difference signal △ Y is a dual space pixel element array, includes the horizontal pixel element that perpendicualr field scans, and elder generation is by horizontal filtering in first and second signal paths (comprising filter 410 and 420).Among the figure in the first half passage,, in unit 412, reduce processing (that is: follow under the horizontal direction down-sampled) by what factor 2 was subjected to level 10: 1 from the signal of the low-pass filtering of filter 410.Filter 420 output signals of Lower Half also are subjected to same treatment in unit 422 in the drawings.Reduced the signal of handling the back, and handled with 414 vertical low pass and high-pass filtering via filter 413 respectively in 10: 1 of unit 412; And the signal that reduces the processing back at 10: 1 of unit 422 outputs is then handled with 424 vertical low pass and high-pass filtering via filter 423 respectively.Vertical low pass filters 413 is identical with 423 functions, and shows characteristic as shown in Figure 7, and perpendicular high pass filter 414 is also identical with 424, and shows characteristic as shown in Figure 8.Filter 413,414,423 gives vertical 10: 1 reduction by unit 415,418,425 and 428 by factor 2 respectively with each output signal of 424 and handles, to produce LL subband luminance difference signal YLL ', LH subband luminance difference signal YLH ', HL subband luminance difference signal YHL, HH subband luminance difference signal YHH.The character of each subband LL, LH, HL and HH has all been chatted bright in preamble.The detailed description of each Quadrature Mirror Filter QMF, can consult nineteen eighty-three Prentice-Hall and publish, R.E.Crochiere and L.R.Rabiuer compile in collaboration with it " multiple rate digital signal processing " (" Multirate digital signal processing ") book.

Accessory channel decoder operation in the receiver is identical with the encoder operation method of transmitter, but order of operation is then opposite.Fig. 5 is the accessory channel decoder side block diagram of Fig. 2.

In Fig. 5, input signal △ S is the analog signal of accessory channel tuner 222 outputs among Fig. 2.Signal △ S includes an A/D converter by incoming modem 512() be sent to a Hafman decoding device 513.When each sequence code word of Hafman decoding device 513 identification, promptly produce corresponding decoding output word afterwards by the memory cell (a for example check table) of a relevant programming, in this memory cell and the transmitter in the Huffman coding network corresponding unit identical.All words of decoding back, or be non-zero values, or be null value running.

Output signal by Hafman decoding device decoding back, give the multichannel resolution process by unit 515, produce each subband luminance signal of quantification back of separation, and be sent to each relevant inverse quantization element 516, all signals are accepted inverse quantization separately and are handled, that is with the quantification treatment of the opposite program of encoder quantification treatment program.With each relevant non-zero values of each subband signal in four subbands, at first multiply by with transmitter in the identical constant of the used constant of quantized level.Then, the numerical value of each nonzero value is increased by quantization threshold used in the transmitter coding device.And each null value is not done any processing.

The subband signal of four separation of inverse quantization network 516 outputs is distinctly write in each segmentation that separates of a memory cell 518.The size of each segmentation is 1/4th of a whole audience memory size, because after carrying out level and vertical 10: 1 reduction and handle with factor 2 in encoder, the size of image is concerned by factor 4 dwindle.When each field memory segmentation was filled data, each subband signal Y ' LL ', Y ' LH ', Y ' HL and the Y ' HH of output promptly was applied to a Quadrature Mirror Filter QMF (QMF) decoder network 519, to produce difference signal △ Y ' output.

Multichannel decompose to quantize each subaisle signal of complementary colors degree, and being is provided to-I, Q processor network 520 by unit 515, and its line configuring is identical with the luminance signal processing that comprises 516,518 and 519 each unit.The output signal of processor 520 comprises each field sequential signal △ I ', △ Q ', utilize unit 522 respectively this signal concern that by factor 2 in addition vertical stretching is handled.The signal △ I ' of spreader 522 outputs and the original time of △ Q ' relation utilize a network to be rebulid, and this network comprises each switch 524,530 and 532 of field synchronization, and a delay network 525 and 526, as shown in the figure.

The more detailed block diagram of brightness QMF decoder 519 as shown in Figure 6.QMF decoder 519 is combined into four brightness subband signal reorganization the luminance difference signal pattern information of one single game.The signal of each subband gives vertical stretching (to up-sampling) by unit 610,611,612 and 613 respectively.This processing ties up to the mode of inserting a null value row between per two row of each frequency band and finishes it.Each band signal after the vertical stretching is the filtering of each low pass in figure and high pass vertical filter 614～617 again.The parameter of each the relative vertical filter in the operating parameter of these filters and the transmitter coding device is identical.Filter 614 and 615 output signal are mixed in the subtraction mode in a blender 618, are multiplied by factor 2 again in unit 620.Similarly, the signal of filter 616 and 617 outputs then mixes in the subtraction mode in a blender 619, is multiplied by factor 2 again in unit 621.

The output signal of blender 620 is handled prior to accepting horizontal stretching by the relation of factor 2 in the unit 622 before accepting unit 623 horizontal low-pass filtering treatment.The level sampling processing that makes progress ties up between the adjacent level sampled signal and to insert a zero values samples signal.Similarly, the signal of blender 621 outputs after then earlier in addition horizontal stretching is handled with factor 2 by unit 624, is accepted the horizontal high-pass filtering of unit 625 again and is handled.Each signal after unit 623 and 625 filtering mixes in the subtraction mode in blender 630, then, is multiplied by factor 2 in unit 632, to produce output signal △ Y '.Multiplier 620,621 and 632 has been functions of signal scale elements, contains roughly with primary signal △ Y that is without to up-sampling and the identical energy that signal was contained before down-sampling to guarantee this output signal △ Y '.

Claims (10)

1, a kind of in order to produce the system that represents visual main signal of a high definition TV (HDTV) and auxiliary signal, it is characterized in that comprising;

One television video frequency signal source (110), its signal is represented the HDTV image information, and its degrees of detail is higher than the degrees of detail of a traditional tv image in fact;

First signal processing apparatus (114) is coupled to above-mentioned signal source, in order to produce a main video signal, represents one to strengthen image, and its degrees of detail is higher than the traditional type video image, but is lower than a HDTV video image;

In order to the device (140) that produces an auxiliary figure difference signal, this signal representative is above-mentioned from the TV signal of signal source and the difference between above-mentioned main video signal;

Secondary signal processing unit (142) in response to above-mentioned difference signal, changes the auxiliary difference signal of back in order to produce one, and this signal processing apparatus comprises:

(a) in order to above-mentioned difference signal being separated into the device of a plurality of digital subband signals, this signal comprises and mainly contains a subband signal more than the data of image border; And

(b) digital data compression device utilizes digital compression techniques to handle above-mentioned each subband signal.

2,, it is characterized in that separator wherein comprises a quadrature mirror image wave-wave device according to the system of claim 1.

3,, it is characterized in that digital data compression device wherein comprises according to the system of claim 1:

The device of above-mentioned each the subband signal of quantification treatment; And

The Huffman encoding device is in response to each subband signal of quantification back of above-mentioned quantization device output.

4,, it is characterized in that wherein representing widescreen HDTV pictorial information from the TV signal of signal source according to the system of claim 1.

5, a kind of system of received television signal, this TV signal comprise a main video signal composition, and the TV image of definition is expanded in representative, and its degrees of detail is higher than a traditional type video image; Other has an auxiliary signal composition, comprises that this auxiliary signal composition includes a plurality of subband signals in order to strengthen above-mentioned expansion definition television image, comprising mainly containing a subband signal more than the image edge information; This system comprises array apparatus down:

First device (202,204) is handled the back with above-mentioned main signal composition and is produced the main image signal information that the resolution chart picture is expanded in a representative;

Second device (222,206) is handled the supplementary that the back produces the above-mentioned expansion definition image enhancement information of representative with above-mentioned auxiliary signal; And

Be used for above-mentioned main image signal information and above-mentioned enhancing information are mixed the device (208,210,212) that generation one representative in back strengthens the output signal that expands the resolution chart picture.

6,, it is characterized in that secondary signal processing unit wherein comprises according to the system of claim 5;

Expand the device of contained data in above-mentioned each subband signal with digital form; And

Device with above-mentioned each subband signal mixing of expanding.

7,, it is characterized in that mixing arrangement wherein comprises a Quadrature Mirror Filter QMF according to the system of claim 6.

8,, it is characterized in that wherein above-mentioned a plurality of subband signal comprises that first composition and that mainly contains horizontal edge information mainly contains second composition of main vertical edge information according to the system of claim 1 or 5.

9, according to the system of claim 2 or 8, it is characterized in that wherein above-mentioned a plurality of subband signal comprises one the 3rd composition, include a large amount of levels and the vertical information that limit the diagonal angle marginal information.

10,, it is characterized in that wherein above-mentioned a plurality of band signals comprise another composition that includes horizontal low frequency information and vertical low frequency information according to the system of claim 3 or 9.

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