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CN1046827A - Television systems employing multiple transmission channels - Google Patents

Television systems employing multiple transmission channels Download PDF

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CN1046827A
CN1046827A CN 90102435 CN90102435A CN1046827A CN 1046827 A CN1046827 A CN 1046827A CN 90102435 CN90102435 CN 90102435 CN 90102435 A CN90102435 A CN 90102435A CN 1046827 A CN1046827 A CN 1046827A
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information
television
signals
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吴筱波
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General Electric Co
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Abstract

自宽频带宽屏幕高清晰度电视(HDTV)源输出之电视信号,经两个传统式NTSC通道传送。主通道信号(115)包括可与现有NTSC电视机兼容之编码宽屏幕和扩充清晰度信息。辅助通道信号(130)增添主通道信号,且包括代表主通道传送信息与来自HDTV源信息间信号差异(△S)信息。两个通道信号(132,134)被HDTV接收机接收后产生HDTV图像(136)。

The television signal output from a wide-bandwidth screen high-definition television (HDTV) source is transmitted over two conventional NTSC channels. The main channel signal (115) includes encoded widescreen and extended definition information compatible with existing NTSC televisions. The auxiliary channel signal (130) augments the main channel signal and includes information representing the signal difference (ΔS) between the main channel transmission and information from the HDTV source. The two channel signals (132, 134) are received by the HDTV receiver to produce an HDTV image (136).

Description

本发明涉及一种利用一个以上传输通道传送图像信息之电视信号处理系统。具体地说,本发明涉及对用以增强主信道信息之辅助信道信息进行编码与解码处理之装置。The invention relates to a television signal processing system for transmitting image information using more than one transmission channel. Specifically, the present invention relates to an apparatus for encoding and decoding auxiliary channel information used to enhance main channel information.

传统式的电视接收机(例如,依美国及其他各地采用之NTSC广播标准所制造之电视接收机)所显示之图像,其宽高比为4∶3(系所显示图像之宽度与高度比率)。最近,对于宽屏幕电视接收系统使用较高的宽高比(例如:2∶1或16∶9或5∶3)发生兴趣者日益增多,因为,利用较高的宽高比与传统式电视接收机所显示之4∶3宽高比相较,前者更接近或等于人眼视界之宽高比。不过,如果宽屏幕电视系统仅能发射比传统式系统更高之宽高比信号,则此种信号并不能与采用传统宽高比的接收机兼容。Images displayed on conventional television receivers, such as those made to the NTSC broadcasting standard used in the United States and elsewhere, have an aspect ratio of 4:3 (the ratio of the width to the height of the displayed image) . Recently, there has been increasing interest in using higher aspect ratios (for example, 2:1 or 16:9 or 5:3) for wide-screen television reception systems because, using higher aspect ratios in conjunction with traditional television reception Compared with the 4:3 aspect ratio displayed by the computer, the former is closer to or equal to the aspect ratio of the human eye field of view. However, if a widescreen television system can only transmit a signal with a higher aspect ratio than a conventional system, such a signal will not be compatible with a receiver using a conventional aspect ratio.

所以,必须要有一种能与传统式电视接收机兼容之宽屏幕电视系统。更重要的是,必须使该等宽屏幕系统具备加强或扩充所显示图像之清晰度的功能,从而可提供更多的图像细节信息。这种宽屏幕EDTV(扩充清晰度电视)系统,已由M.A.Isnardi等人于一九八七年十二月出版之第BC-33卷“电子电机工程师协会广播事业报导”“IEEE    Transactions    on    Broadcasting”)中发表之“促进ACTV系统中兼容性与图像重现性之编码方法”“Encoding    for    Compatibility    and    recoverability    in    the    ACTV    System”)一文中,以及在一九八八年二月份出版之第34卷“IEEE消费性电子工业报导”(“IEEE    Transaction    on    consumer    electronics”)中发表之“ACTV系统之解码处理问题”(“Decoding    issues    in    the    ACTV    System”)一文中详加说明。Therefore, it is necessary to have a wide screen television system compatible with conventional television receivers. More importantly, such wide-screen systems must have the function of enhancing or expanding the clarity of the displayed image, thereby providing more image detail information. This wide-screen EDTV (Extended Definition Television) system has been published by M.A. Isnardi et al. in December 1987, Volume BC-33 "Institute of Electronics and Electrical Engineers Broadcasting Report" "IEEE Transactions on Broadcasting" "Encoding for Compatibility and recoverability in the ACTV System" published in "Encoding for Compatibility and Recoverability in the ACTV System", and in Volume 34 published in February 1988 " This is explained in detail in the article "Decoding issues in the ACTV System" published in "IEEE Transaction on consumer electronics".

高清晰度电视(HDTV)宽屏幕系统,通常均使用两个通道。利用两个通道传送宽屏幕HDTV信息,其优点之一已由M.A.Iisnardi等人于第252,340号美国专利申请(申请专利名称为“使用整个信号传输通道之扩充清晰度宽屏幕电视系统”)中述及。该专利申请说明书中说明一种两个通道之高清晰度宽屏幕系统,其中之NTSC兼容主通道系以宽屏幕信息和上述Isnardi等人论文中所述及之额外图像细节信息来进行编码;而其中之辅助通道则含有可用以扩充主通道所含信息之信息。有关主通道信号编码技术,在J.S.Fuhrer所提出的题为“具有辅助信号编码信息压缩扩张功能之兼容性电视系统”之第139,339号美国专利申请中,以及M.A.Isnardi所提出的题为“扩充清晰度宽屏幕电视信号处理系统”之第139,340号美国专利申请中,均有详细的说明。High-definition television (HDTV) widescreen systems, usually using two channels. One of the advantages of using two channels to transmit wide-screen HDTV information has been filed by M.A.Iisnardi et al. in U.S. Patent No. 252,340 (the title of the application is "Extended Definition Wide-screen Television System Using the Entire Signal Transmission Channel") mentioned in. This patent application specification describes a two-channel high-definition widescreen system in which the NTSC compatible main channel is encoded with widescreen information and additional image detail information as described in the aforementioned Isnardi et al. paper; and The auxiliary channel contains information that can be used to augment the information contained in the main channel. Main channel signal coding techniques are described in U.S. Patent Application No. 139,339 by J.S. Fuhrer entitled "Compatible Television System with Companding and Expansion of Auxiliary Signal Coding Information" and by M.A. Isnardi entitled " In the U.S. Patent Application No. 139,340 of "Extended Definition Wide-Screen Television Signal Processing System", there are detailed descriptions.

本说明书认为,应该提供一种两个通道宽屏幕HDTV系统,使其具备一数字辅助信道,且该通道所含信号信息系经过这样地数字压缩处理之信息,使得可减少可能因数据压缩处理所发生之观赏者可目视之外来噪音信号。因此,依本发明原理,在进行数字数据压缩处理前,先将辅助数字信号编码,使其分离为多个以含有图像边缘信息为主之副频带信号成份。This specification thinks, should provide a kind of two-channel wide-screen HDTV system, make it have a digital auxiliary channel, and the signal information contained in this channel is the information of such digital compression processing, so that it can reduce possible loss due to data compression processing. The viewer can visually observe the extraneous noise signal that occurs. Therefore, according to the principle of the present invention, before performing digital data compression processing, the auxiliary digital signal is encoded to separate it into a plurality of sub-band signal components mainly containing image edge information.

本发明系实现于一宽屏幕高清晰度系统中,该系统经由一NTSC兼容性主通道和一辅助扩充通道发射信号。主通道系依上述Isnardi等人公开之方法,利用宽屏幕及额外细节加强信息编码。而辅助通道则传送一种代表原来高清晰度视频信号源信息和主通道所传送信息间差异之差异信号。The present invention is implemented in a widescreen high definition system that transmits signals via an NTSC compatible main channel and an auxiliary expansion channel. The main channel was encoded using wide screen and extra detail enhancement information following the method disclosed by Isnardi et al. above. The auxiliary channel transmits a difference signal representing the difference between the original high-definition video source information and the information transmitted by the main channel.

图1系一两个通道电视信号传输系统之方框图,包括依本发明设计之编码器装置。Fig. 1 is a block diagram of a two-channel television signal transmission system including an encoder device according to the invention.

图2系一与图1系统有关之两个通道接收机解码器配置方框图。FIG. 2 is a block diagram of a two channel receiver decoder configuration associated with the system of FIG. 1. FIG.

图3和图4所示为辅助通道内所使用之编码器装置方框图。Figures 3 and 4 show block diagrams of encoder arrangements used in the auxiliary channel.

图5和图6所示为接收机中与辅助通道有关之解码器装置方框图。Figures 5 and 6 show block diagrams of the decoder arrangement associated with the auxiliary channel in the receiver.

图7和图8所示为与图4和图6装置有关之各滤波器频率响应曲线图。Figures 7 and 8 are graphs showing the frequency response of the filters associated with the arrangement of Figures 4 and 6 .

图1中,来自一信号源110(例如一视频摄影机)之宽屏幕(例如:16∶9宽度比)高清晰度电视(HDTV)信号Y、I和Q,施加至一发射机112。信号Y含有亮度图像信息,其水平频带范围为0赫兹至20兆赫,而信号I和Q系含有色度图像信息,其水平频带范围为0赫兹至10兆赫。In FIG. 1, widescreen (eg, 16:9 aspect ratio) high definition television (HDTV) signals Y, I and Q from a source 110 (eg, a video camera) are applied to a transmitter 112 . Signal Y contains luminance image information and has a horizontal frequency band ranging from 0 Hz to 20 MHz, while signals I and Q contain chrominance image information and has a horizontal frequency band ranging from 0 Hz to 10 MHz.

信号Y、I和Q由一单通道编码器114予以编码处理,该编码器与上述各专利申请以及Isnardi等人论文中所说明之编码器类型相同。信号编码后,由一天线115发射。所发射之信号由一传统式NTSC接收机122之天线120接收,同时,由一宽屏幕扩充清晰度电视(EDTV)接收机(包括一宽屏幕显示器128)之天线124所接收。宽屏幕EDTV接收机包括一单通道解码器125(与上述各专利申请书及说明Isnardi等人论文中所说之解码器类型相同),用以将所接收之信号解码为构成扩充清晰度亮度及色度图像成份之信号Y、I和Q,并在宽屏幕EDTV显示器128上显示该等信号。Signals Y, I and Q are encoded by a single pass encoder 114 of the type described in the aforementioned patent applications and the Isnardi et al. paper. After encoding, the signal is transmitted by an antenna 115 . The transmitted signal is received by antenna 120 of a conventional NTSC receiver 122 and, simultaneously, by antenna 124 of a widescreen Extended Definition Television (EDTV) receiver (including a widescreen display 128). The widescreen EDTV receiver includes a single channel decoder 125 (of the same type as described in the aforementioned patent applications and the accompanying Isnardi et al. paper) for decoding the received signal into components comprising extended definition luminance and The signals Y, I and Q of the chrominance image components are displayed on the wide screen EDTV display 128.

图1之系统另亦包括一辅助通道编码器142,其中包括本发明所揭示之副频带编码器和数字数据压缩器。代表宽屏幕接收机128所显示之宽屏幕EDTA信号信息和来自信号源110之原始宽屏幕HDTV信号信息二者间差异之信号,由编码器142予以编码处理。该差异信号系从信号源110所提供之信号Y、I和Q中减除单通道解码器140输出之信号Y′、I′和Q′之方法得来。单波道解码器140可与解码器125类型相同。编码器142输出之辅助电视信号△S,系由天线130发射。The system of FIG. 1 also includes an auxiliary channel encoder 142, which includes the subband encoder and digital data compressor disclosed in the present invention. A signal representing the difference between the widescreen EDTA signal information displayed by widescreen receiver 128 and the original widescreen HDTV signal information from source 110 is encoded by encoder 142 . The difference signal is obtained by subtracting the signals Y', I' and Q' output from the single channel decoder 140 from the signals Y, I and Q provided by the signal source 110. Single channel decoder 140 may be of the same type as decoder 125 . The auxiliary television signal ΔS output by the encoder 142 is transmitted by the antenna 130 .

由天线130发射之辅助差异信号,和由天线115发射之主信号,被宽屏幕HDTV电视接收系统之天线132所接收。该电视系统包括一双通道解码器134,用以将主信号和辅助信号解码,并将解码后之亮度及色度构成信号相加,以产生适合宽屏幕HDTV显示器134显示之宽屏幕HDTV成份信号Y′、I′和Q′。依本发明设计之编码器142和解码器134之对应元件,将于下文中讨论之。The auxiliary difference signal transmitted by the antenna 130 and the main signal transmitted by the antenna 115 are received by the antenna 132 of the wide-screen HDTV television receiving system. The television system includes a two-channel decoder 134 for decoding the main signal and the auxiliary signal, and adding the decoded luminance and chrominance signals to generate a wide-screen HDTV component signal Y suitable for display by a wide-screen HDTV display 134 ', I' and Q'. The corresponding elements of encoder 142 and decoder 134 designed in accordance with the present invention are discussed below.

图2系图1所示双通道解码器134之一种范例配置方框图。天线220耦合至调谐器202和222,此二个调谐器分别调谐传送主信号之射频通道和传送辅助信号△S之射频通道。单通道解码器204将调谐器202产生之主信号解码后产生Y′、I′和Q′信号成份。解码器204可采用前述各专利申请和Isnardi等人论文中所说明之相同单通道解码器。辅助信号解码器206包括量化网络,将来自调谐器222之辅助信号△S解码后产生量化后之增强亮度差异信号△Y′和量化后之增强色度差异信号△I′和△Q′。稍后,于下文中将详细讨论辅助信号解码器。信号△Y′、△I′和△Q′分别经由加法器208、210和212与每帧525行之连续扫瞄信号Y′、I′和Q′(由单波道解码器204输出)混合后,产生每帧1050行之隔行扫瞄信号Y″、I″和Q″,然后送至图1之宽屏幕HDTV显示器136。显示器136可采用传统式525行连续扫瞄显示器,受一场频信号控制,将525条显示行每场移位隔行扫描空间之二分之一,以达到1050行隔行扫瞄之效果。FIG. 2 is a block diagram of an exemplary configuration of the two-channel decoder 134 shown in FIG. 1 . Antenna 220 is coupled to tuners 202 and 222, which tune the RF channel carrying the main signal and the RF channel carrying the auxiliary signal ΔS, respectively. Single channel decoder 204 decodes the main signal generated by tuner 202 to generate Y', I' and Q' signal components. Decoder 204 may employ the same single-pass decoder as described in the aforementioned patent applications and the Isnardi et al. paper. Auxiliary signal decoder 206 includes a quantization network for decoding auxiliary signal ΔS from tuner 222 to generate quantized enhanced luminance difference signal ΔY' and quantized enhanced chrominance difference signals ΔI' and ΔQ'. Later, the auxiliary signal decoder will be discussed in detail below. Signals △Y', △I' and △Q' are mixed with continuous scanning signals Y', I' and Q' (output by single-channel decoder 204) of 525 lines per frame through adders 208, 210 and 212, respectively Afterwards, produce the interlaced scanning signal Y " of every frame 1050 lines, I " and Q ", send to the wide-screen HDTV display 136 of Fig. 1 then. Display 136 can adopt traditional 525 line continuous scanning display, is subjected to one field frequency Signal control, shifting 525 display lines by half of the interlaced scanning space per field to achieve the effect of 1050 interlaced scanning.

如前述各专利申请及Isnardi等人文章中之详细说明,主通道传送之编码后NTSC兼容性信号,包括三种信号成份。简言之,三个信号成份中之第一个成份信号乃系一每帧525行之2∶1隔行基频带信号,并具有标准之4∶3宽高比。此一信号成份包括来自原始宽屏幕信号源之中心屏面信息,经时间扩展处理后,几乎占据起作用的扫描行整个时段。该第一信号成份另亦包括侧屏水平低频信息,该信息已经过时间压缩入标准NTSC接收器显示器122左右两侧之水平图像过扫瞄区内。低频侧屏信息因标准NTSC制接收机并不显示该信号,故观赏者亦无法看到。该第一信号成份与第二和第三信号成份混合前,先受帧内平均处理,使其频率大约在1.5兆赫以上。As detailed in the aforementioned patent applications and the Isnardi et al. article, the encoded NTSC compatible signal transmitted by the main channel includes three signal components. Briefly, the first of the three signal components is a 2:1 interlaced baseband signal with 525 lines per frame and has a standard 4:3 aspect ratio. This signal component includes the center screen information from the original widescreen source and, after time expansion processing, occupies almost the entire period of the active scan line. The first signal component also includes side-screen horizontal low frequency information that has been time-compressed into the horizontal image overscan regions on the left and right sides of the standard NTSC receiver display 122 . The low-frequency side-screen information cannot be seen by viewers because standard NTSC receivers do not display this signal. The first signal component is subjected to intraframe averaging before being mixed with the second and third signal components so that its frequency is above approximately 1.5 MHz.

第二信号成份是一种由原始源信号中导出之2∶1隔行基频带辅助信号,其中除低频信息外之屏面左右两侧高频信息,系经过时间扩展处理后,占据起作用的扫瞄行时段之一半。因此,经时间扩展后之侧屏高频信息,实际上占据第二信号成份起作用的扫描行之全部时段。The second signal component is a 2:1 interlaced baseband auxiliary signal derived from the original source signal, in which the high-frequency information on the left and right sides of the screen except the low-frequency information occupies the active scanning area after time-expanding processing. Half of the aiming time period. Therefore, the time-expanded high-frequency information of the side screen actually occupies the entire period of the scanning line where the second signal component is active.

第三信号成份是由原始源信号中导出之辅助用2∶1隔行基频带信号,并包含在大约5.0兆赫与6.0兆赫范围内之额外高频水平亮度细节信息。此信息之频率被降低至0至1兆赫频带以内。The third signal component is an auxiliary 2:1 interlaced baseband signal derived from the original source signal and contains additional high frequency level luminance detail information in the range of approximately 5.0 MHz and 6.0 MHz. The frequency of this information is reduced to within the 0 to 1 MHz band.

第二和第三信号成份各经帧内平均处理及幅度压缩后,再分别调制正交相位相关的各抑制后辅助副载波信号。各辅助副载波信号之频率(例如为3.108兆赫),为水平行扫瞄频率二分之一之奇数倍,并在NTSC基带信号频谱之色度频带范围以内。此外,各辅助副载波信号相邻两场之相位差为180°,而每一场系由262条水平扫瞄行之周期限定之。因此,辅助副载波信号之相位交变方式与NTSC色度副载波信号之相位交变不同。正交调制后之辅助副载波信号与经过帧内平均处理之第一信号成份混合,其混合后之合成信号,用以调制由图1中主波道天线115播送之射频图像载波。The second and third signal components are subjected to intra-frame average processing and amplitude compression, and then respectively modulate the quadrature-phase correlated suppressed auxiliary sub-carrier signals. The frequency of each auxiliary subcarrier signal (for example, 3.108 MHz) is an odd multiple of 1/2 of the horizontal horizontal scanning frequency, and is within the chrominance frequency range of the NTSC baseband signal spectrum. In addition, the phase difference between two adjacent fields of each auxiliary subcarrier signal is 180°, and each field is defined by a period of 262 horizontal scanning lines. Therefore, the phase alternation of the auxiliary subcarrier signal is different from that of the NTSC chrominance subcarrier signal. The auxiliary subcarrier signal after quadrature modulation is mixed with the first signal component processed by intra-frame averaging, and the mixed composite signal is used to modulate the radio frequency image carrier broadcast by the main channel antenna 115 in FIG. 1 .

辅助差异信号△Y、△I和△Q,由单元142用一种数字副频带编码和数据压缩处理(下文将讨论之)予以编码和压缩。差异信号△Y、△I和△Q于经过事先之模拟/数字转换处理后,应为数字(二进制)形式,并包含相当低能量之高频信息。在本例中,主通道信号系由天线115以模拟形式播送。The auxiliary difference signals ΔY, ΔI and ΔQ are encoded and compressed by unit 142 using a digital subband encoding and data compression process (discussed below). The difference signals △Y, △I and △Q should be in digital (binary) form after analog/digital conversion processing in advance, and contain relatively low-energy high-frequency information. In this example, the main channel signal is broadcast by antenna 115 in analog form.

图3所示之装置适合于图1中之辅助通道编码器142。亮度差异信号△Y施加至一正交镜象滤波器(QMF)312,将信号△Y分离为四个隔开之空间频率副频带。此四个频带区别为LL频带(低水平与低垂直频带),LH频带(低水平及高垂直频带),HL频带(高水平及低垂直频带),与HH频带(高水平及高垂直频带)。每一频带分别代表该特定空间频率带差异信号△Y中出现之能量。The arrangement shown in Figure 3 is suitable for the auxiliary channel encoder 142 in Figure 1 . The luminance difference signal ΔY is applied to a quadrature mirror filter (QMF) 312 which separates the signal ΔY into four spaced subbands of spatial frequency. These four frequency bands are divided into LL frequency band (low horizontal and low vertical frequency band), LH frequency band (low horizontal and high vertical frequency band), HL frequency band (high horizontal and low vertical frequency band), and HH frequency band (high horizontal and high vertical frequency band) . Each frequency band represents the energy present in the difference signal ΔY for that particular spatial frequency band, respectively.

以一包含水平,垂直和斜线边缘信息之图像物体而言,与LL副频带有关之信息代表该物体之模糊影像,而与LH、HL和HH副频带有关之信息,则分别代表水平、垂直和斜线边缘信息。LH、HL和HH频带,各包括平场信息以外之图像边缘信息。每一频带于被施加至一时间多路复用器313之前先依预定算法之数据,分别由量化器314a至314b予以量化。For an image object containing horizontal, vertical and oblique line edge information, the information related to the LL sub-band represents the blurred image of the object, while the information related to the LH, HL and HH sub-bands represent the horizontal, vertical and slashed edge information. The LH, HL and HH frequency bands each include image edge information in addition to flat field information. The data of each frequency band is quantized by quantizers 314a to 314b respectively according to a predetermined algorithm before being applied to a time multiplexer 313.

△I和△Q差异信号于被施加至多路复用器313之前,以上述处理信号△Y之相同方式,由一QMF编码器322(与QMF编码器312相同)与各量化器324a至324d(与量化器312a至314d相同)予以处理。如以前所述,信号I和Q之频带宽度为10兆赫,或为亮度信号Y20兆赫频带宽度之一半。因此,差异信号△I和△Q是信号△Y水平频带宽度之一半。为使水平、垂直和时间空间内保持相同之亮度对色度频带宽比率2∶1,并获得较大之色度压缩,于副频带编码处理前,先将信号△I和△Q按垂直与时间2∶1之比例关系而降至十分之一。此系利用一输入电路完成之,该电路包括一场开关325和一2∶1垂直减至十分之一(下降采样)电路327。当开关325在图中所示位置时,于偶数图像场期间,该开关即将差异信号△I传送至垂直下降采样器327,而当开关325于在另一位置时,该开关即将差异信号△Q传送至垂直下降采样器327。The ΔI and ΔQ difference signals are passed by a QMF encoder 322 (identical to QMF encoder 312) with respective quantizers 324a to 324d ( The same as the quantizers 312a to 314d) are processed. As previously stated, the I and Q signals have a frequency bandwidth of 10 MHz, or half the 20 MHz bandwidth of the luminance signal Y. Therefore, the difference signals ΔI and ΔQ are half the horizontal bandwidth of the signal ΔY. In order to maintain the same luminance to chrominance frequency bandwidth ratio of 2:1 in horizontal, vertical and time spaces, and to obtain greater chrominance compression, before the sub-band coding process, the signals △I and △Q are firstly divided into vertical and chromatic The time ratio of 2:1 is reduced to one-tenth. This is accomplished using an input circuit comprising a field switch 325 and a 2:1 vertical tenth (downsampling) circuit 327. When the switch 325 is in the position shown in the figure, the switch transmits the difference signal ΔI to the vertical downsampler 327 during the even image field, and when the switch 325 is in the other position, the switch transmits the difference signal ΔQ sent to the vertical downsampler 327.

由各量化器314a至314d于亮度信号路径中所产生之数据量化作用,系包括编码器315在内之数字数据压缩处理程序构成部份之一。数据压缩处理除去冗余数据,因此,较少的资料位可以较低的速度传送,而不致对信息之分辨率造成显著影响。在本具体实例中,数据速度约为500兆位/秒之输入数据被压缩为20兆位/秒之数据速率,此与传统式NTSC电视系统之6兆赫频带宽度可以兼容。The quantization of data by each quantizer 314a to 314d in the luminance signal path is an integral part of the digital data compression process including encoder 315 . Data compression removes redundant data so that fewer data bits can be transmitted at a lower speed without significantly affecting the resolution of the information. In this embodiment, incoming data at a data rate of approximately 500 Mbit/s is compressed to a data rate of 20 Mbit/s, which is compatible with the 6 MHz bandwidth of conventional NTSC television systems.

与模拟式数据压缩处理相较,数字数据压缩之优点为可在解码器处提供更佳之无噪音信息恢复功效,并可为低噪音信号获得一显著改善之信噪比。就此点而言,也发现在数据压缩处理前,先将输入信号分段为四个副频带LL、LH、HL和HH,可使数据压缩处理所产生之噪音于再生后所显示之图像中显著减少。以数据压缩方式处理未分段原始信号之系统,不能区分“平整”图像区与边缘区。因而,接收机将数据扩展后,压缩处理时所产生之噪音就会出现在整个图像区之内。作为相比,本发明公开之数据压缩系统之优点乃系由于如上所述将输入信号分离为数个副频带,而可区分平整图像区和边缘图像区。本发明公开之数据压缩系统,其设计主要系对于与LH、HL和HH各频带有关之边缘信息进行操作,因此,由压缩处理产生之噪音系与图像边缘有关,且当图像信息于解码器处再生时,其影响较低。与水平边缘信息(频带LH)和垂直边缘信息(HL)有关之副频带信号,被视为比其他信号更重要。与LL频带有关之信号,为可选用信号。例如,可用以载运信息以减少与主通道信号相关之外来信号,或用以协助由隔行扫瞄转换为连续扫瞄。Advantages of digital data compression compared to analog data compression processes are better noise-free information recovery at the decoder and a significantly improved signal-to-noise ratio for low-noise signals. In this regard, it was also found that before the data compression process, the input signal is segmented into four sub-bands LL, LH, HL, and HH, so that the noise generated by the data compression process can be conspicuous in the displayed image after reproduction. reduce. Systems that process unsegmented raw signals in a data-compressed manner cannot distinguish between "flat" image regions and edge regions. Therefore, after the receiver expands the data, the noise generated during the compression process will appear in the entire image area. In contrast, the advantage of the data compression system disclosed in the present invention is that it can distinguish between flat image areas and edge image areas due to the separation of the input signal into several sub-bands as described above. The data compression system disclosed in the present invention is mainly designed to operate on the edge information related to the frequency bands of LH, HL and HH. Therefore, the noise generated by the compression process is related to the edge of the image, and when the image information is at the decoder When regenerating, its impact is low. Subband signals related to horizontal edge information (band LH) and vertical edge information (HL) are considered more important than other signals. Signals related to the LL band are optional signals. For example, it can be used to carry information to reduce extraneous signals related to the main channel signal, or to assist in the conversion from interlaced to continuous scanning.

量化处理减少输入信号数据位中之变异内容,以使随后之哈夫曼(Huffman)编码器可利用较少数据位以更有效的方式将数据编码。所采用之量化处理方式将根据某一系统之信号特性而选定之。在本具体实例中,四个副频带信号,均系接受相同方式之量化处理,因为各该频带信号之特性和能量分布状况大致相同。但是,如采用分离之副频带信号成份,就需要依照该特定系统之需要,以不同的方式分别处理每一副频带信号成份。由于量化处理主要与边缘信息有关,因此,量化处理期间可能丧失之信息,并不会显著损害观赏者所看到的再生图像。The quantization process reduces the variation content in the data bits of the input signal so that a subsequent Huffman encoder can encode the data in a more efficient manner using fewer data bits. The quantization processing method adopted will be selected according to the signal characteristics of a certain system. In this embodiment, the four sub-band signals are all quantized in the same way, because the characteristics and energy distribution of the signals in each of the sub-bands are roughly the same. However, if separate sub-band signal components are used, each sub-band signal component needs to be processed separately in a different manner according to the needs of the particular system. Since the quantization process is mainly concerned with edge information, information that may be lost during the quantization process does not significantly impair the reconstructed image seen by the viewer.

量化处理为众所周知,且涉及输入的数据的阈值比较。简言之,由QMF编码器输出之每一副频带信号中之象素元素数量为原始输入信号中象素元素数量之四分之一。每一元素为一八位字,其中有一符号位和确定该元素大小之多个位。每一八位字相当于经QMF处理,缩减为十分之一后之一个图像元素。亦即,在此点上,原始信号象素元素数量和各八位字象素元素之间并无直接1∶1之相对应关系。每一元素之大小,须和一阈值相互比较。如其大小超过该阀值,则代表该元素大小之数值即由一代表该元素大小值超过该阀值之差值所取代。符号位则保持不变。通过将该替代值除以一个定值并将其商数取整的方式,使该替代值接受均匀量化处理。此一程序可利用一检查表完成之。The quantization process is well known and involves threshold comparisons of incoming data. In short, the number of pixel elements in each subband signal output by the QMF encoder is one quarter of the number of pixel elements in the original input signal. Each element is an octet with a sign bit and bits that determine the size of the element. Each octet is equivalent to being processed by QMF and reduced to one tenth of an image element. That is, at this point, there is no direct 1:1 correspondence between the number of pixel elements of the original signal and the pixel elements of each octet. The size of each element must be compared with a threshold. If its size exceeds the threshold value, the value representing the size of the element is replaced by a difference value representing the size value of the element exceeding the threshold value. The sign bit remains unchanged. The substitute value is subjected to uniform quantization by dividing the substitute value by a fixed value and rounding its quotient. This procedure can be accomplished using a checklist.

多路复用器313提供一八位数据流至编码器段315。由314a至314d各单元送来之量化后亮度副频带差异信号,和来自324a至324d各单元之量化后之场序副频带色差异信号△I、△Q,由一前置网络(图中未显示)将各该信号互相延迟一预定量,如此,以其他方式同时发展出来之亮度和色度信号,于多路复用处理期间不致重叠。自314a至314b各单元输出之量化后信号,经过时间多路复用处理为一系列八位字,其后随以经过时间多路复用处理后之场序量化后信息△I和△Q。Multiplexer 313 provides an eight-bit data stream to encoder section 315 . The quantized luminance sub-band difference signals sent from units 314a to 314d, and the quantized field-sequential sub-band color difference signals △I and △Q from units 324a to 324d are sent by a pre-network (not shown in the figure) display) delay each of the signals from each other by a predetermined amount so that otherwise simultaneously developed luminance and chrominance signals do not overlap during the multiplexing process. The quantized signals output by each unit from 314a to 314b are time-multiplexed into a series of octets, followed by time-multiplexed field-sequential quantized information ΔI and ΔQ.

编码器方框315包括-哈夫曼编码器,此系一可变长度熵编码器,具有熟知之结构与特性,其前有一普通之零运转长度(zero-run    length)编码器。预期经常发生之数据数值,系利用短码字予以编码;而预期发生次数较少之数据数值,则系利用较长码字予以编码。编码处理程序包括利用一预先产生的编程的检查表,随输入数据字之变化而产生编码后之输出数据,包括量化后之非零值和连续之零值。量化后数据输入至哈夫曼编码后,经过扫瞄,以检查其中之量化后非零值和零值。由于量化量314中之阈值处理和量化处理操作,上述各数值中通常大部份为零值。凡出现一非零值量化数据,随即产生一相应的编程的输出代码字。第一次检测到一零量化值时,不论系在一图像行开始时或紧随一非零值之后,即使计数器复位。其后,每有一零值,该计数器即增加一个1。此乃各零值之“运转”(run),而此一运转于发生一非零值或一已知行终了时就终止。当一次运转终止时,即产生一相当于运转值(长度)之一个输出代码字。Encoder block 315 includes - Huffman encoder, which is a variable length entropy encoder with well known structure and properties, preceded by a conventional zero-run length encoder. Data values that are expected to occur frequently are encoded using short codewords; data values that are expected to occur less frequently are encoded using longer codewords. The encoding process includes utilizing a pre-generated programmed look-up table to generate encoded output data, including quantized non-zero values and consecutive zero values, as input data words vary. After the quantized data is input into the Huffman encoding, it is scanned to check the quantized non-zero and zero values. Due to the thresholding and quantization processing operations in the quantization quantity 314, most of the above values are usually zero values. Whenever a non-zero valued quantized data is present, a corresponding programmed output code word is generated. The counter is reset the first time a quantized value of zero is detected, either at the beginning of a picture line or immediately after a non-zero value. Thereafter, the counter is incremented by one for each zero value. This is a "run" of zero values, and the run terminates when a non-zero value occurs or a known row ends. When a run is terminated, an output code word corresponding to the run value (length) is generated.

缓冲器316之用途为一接口,使该哈夫曼编码器315之可变输出数据速率能与传送多路复用压缩后差异信号△S之输出通道之固定数据速率(例如,20兆位/秒)相容。缓冲器316之输出信号经由一内含一数/模转换器之调制解调器318而传送至该输出通道。输出信号△S调制在一适当之射频载波上,经由辅助通道广播播送。亦可利用其他传输工具播送,例如微波或光纤链路。The purpose of the buffer 316 is to interface the variable output data rate of the Huffman encoder 315 with the fixed data rate (e.g., 20 Mbit/s) of the output channel carrying the multiplexed compressed difference signal ΔS. seconds) compatible. The output signal of buffer 316 is sent to the output channel via a modem 318 including a digital-to-analog converter. The output signal ΔS is modulated on an appropriate radio frequency carrier and broadcast via the auxiliary channel. It can also be broadcast using other transmission means, such as microwave or fiber optic links.

图4为图3中正交镜象滤波器式编码器312之详图。QMF编码器包括两个数字FIR(有限脉冲响应)滤波器。其中之一包括一水平低通滤波器410,另一则包括一水平高通滤波器420。此两个滤波器彼此互补,亦即二者之频率响应系以一半奈奎斯特(Nyquist)频率为中心,形成彼此之镜象图像。该两个滤波器之归一化频率响应曲线分别如图7和8所示。在图7和8中,0.5f点相当于模拟图像信息转换为数字信息时之奈奎斯特采样频率。滤波器410和420在一半奈奎斯特频率(0.25f)左右形成镜象图像响应。低通滤波器410在一半奈奎斯特频率处显示一截止频率,而高通滤波器420则以一半奈奎斯特频率处为其通带频率之开始点。FIG. 4 is a detailed diagram of the quadrature mirror filter encoder 312 of FIG. 3 . The QMF encoder includes two digital FIR (finite impulse response) filters. One of them includes a horizontal low-pass filter 410 and the other includes a horizontal high-pass filter 420 . The two filters are complementary, that is, their frequency responses are centered at half the Nyquist frequency, forming mirror images of each other. The normalized frequency response curves of the two filters are shown in Figures 7 and 8, respectively. In FIGS. 7 and 8, the 0.5f point corresponds to the Nyquist sampling frequency when analog image information is converted into digital information. Filters 410 and 420 form a mirrored image response around half the Nyquist frequency (0.25f). The low-pass filter 410 exhibits a cutoff frequency at half the Nyquist frequency, while the high-pass filter 420 starts its passband frequency at half the Nyquist frequency.

输入差异信号△Y为二度空间象素元素阵列,内含垂直场扫瞄之水平象素元素,在第一和第二信号路径(包括滤波器410和420)中先被水平滤波。图中上半部通道中,来自滤波器410之低通滤波之信号,在单元412中按因数2受到水平10∶1的减缩处理(亦即:循水平方向下降采样)。在图中下半部之滤波器420输出信号于单元422中也受到相同处理。单元412的10∶1减缩处理后之信号,分别经由滤波器413和414之垂直低通与高通滤波处理;而单元422输出的10∶1减缩处理后之信号,则分别经由滤波器423和424之垂直低通与高通滤波处理。垂直低通滤波器413和423功能相同,并显示如图7所示之特性,而垂直高通滤波器414和424也相同,并显示如图8所示之特性。滤波器413、414、423和424之各输出信号分别由单元415、418、425和428按因数2予以垂直10∶1的缩减处理,以产生LL副频带亮度差异信号YLL′、LH副频带亮度差异信号YLH′,HL副频带亮度差异信号YHL、HH副频带亮度差异信号YHH。各副频带LL、LH、HL和HH之性质均已于前文中叙明。各正交镜象滤波器之详细说明,可参阅1983年Prentice-Hall出版,R.E.Crochiere和L.R.Rabiuer合编之“多重速率数字信号处理”(“Multirate    digital    signal    processing”)一书。The input difference signal ΔY is an array of two-dimensional spatial pixel elements containing horizontal pixel elements for vertical field scanning, which are first horizontally filtered in the first and second signal paths (including filters 410 and 420). In the upper channel of the figure, the low-pass filtered signal from filter 410 is downscaled (i.e., downsampled horizontally) by a factor of 2 in unit 412 by a factor of 10:1. The output signal of the filter 420 in the lower half of the figure is also processed in the unit 422 in the same way. The signal after the 10:1 reduction processing of the unit 412 is processed by the vertical low-pass and high-pass filtering of the filters 413 and 414 respectively; while the signal after the 10:1 reduction processing output by the unit 422 is respectively passed through the filters 423 and 424 Vertical low-pass and high-pass filtering. Vertical low-pass filters 413 and 423 have the same function and exhibit characteristics as shown in FIG. 7, and vertical high-pass filters 414 and 424 are also identical and exhibit characteristics as shown in FIG. The respective output signals of the filters 413, 414, 423 and 424 are respectively vertically reduced by a factor of 10:1 by the units 415, 418, 425 and 428 to generate the LL subband luminance difference signal YLL', the LH subband luminance Difference signal YLH', HL sub-band luminance difference signal YHL, HH sub-band luminance difference signal YHH. The properties of the subbands LL, LH, HL and HH have been described above. For a detailed description of each quadrature mirror filter, please refer to the book "Multirate digital signal processing" published by Prentice-Hall in 1983, co-edited by R.E.Crochiere and L.R.Rabiuer.

接收机内之辅助通道解码器操作与发射机之编码器操作方法相同,但操作次序则相反。图5为图2之辅助通道解码器方框图。The operation of the auxiliary channel decoder in the receiver is the same as that of the encoder in the transmitter, but the order of operation is reversed. FIG. 5 is a block diagram of the auxiliary channel decoder of FIG. 2 .

在图5中,输入信号△S系图2中辅助通道调谐器222输出之模拟信号。信号△S由输入调制解调器512(内含一模/数转换器)传送至一哈夫曼解码器513。当哈夫曼解码器513识别每一序列代码字时,即由一相关之编程的存储单元(例如一检查表)产生一相对应之解码后输出字,该存储单元与发射机中哈夫曼编码网络中相对应单元相同。解码后之诸字,或为非零数值,或为一零值运转。In FIG. 5, the input signal ΔS is an analog signal output from the auxiliary channel tuner 222 in FIG. The signal ΔS is sent to a Huffman decoder 513 by an input modem 512 (containing an analog-to-digital converter). As the Huffman decoder 513 recognizes each sequence of codewords, a corresponding decoded output word is generated from an associated programmed memory location (e.g., a look-up table) that is compatible with the Huffman codeword in the transmitter. The corresponding units in the encoding network are the same. The decoded words are either non-zero values or run with a zero value.

由哈夫曼解码器解码后之输出信号,由单元515予以多路分解处理,产生分离之量化后各副频带亮度信号,并送往各相关之逆向量化单元516,诸信号单独接受逆向量化处理,亦即与编码器量化处理程序相反程序之量化处理。与四个副频带中每一副频带信号有关之各非零数值,首先乘以和发射机中量化级所用常数相同之常数。然后,各非零值之数值,按发射机编码器内所用之量化阈值予以增加。而对各零值不作任何处理。The output signal decoded by the Huffman decoder is demultiplexed by the unit 515 to generate separated quantized sub-band luminance signals, and sent to each related inverse quantization unit 516, and the signals are individually subjected to inverse quantization processing , that is, the quantization process of the reverse procedure of the encoder quantization process. Each non-zero value associated with each of the four subband signals is first multiplied by the same constant used for the quantization level in the transmitter. The value of each non-zero value is then incremented by the quantization threshold used in the transmitter encoder. No processing is done for each zero value.

逆向量化网络516输出之四个分离之副频带信号,被各别写入一场存储单元518之各分离的分段中。每一分段之大小为全场存储器大小之四分之一,因为,在编码器中以因数2进行水平及垂直10∶1的缩减处理后,使影像之大小按因数4关系缩小。当每一场存储器分段被填充数据时,输出之各副频带信号Y′LL′、Y′LH′、Y′HL和Y′HH即施加至一正交镜象滤波器(QMF)解码器网络519,以产生差异信号△Y′输出。The four separate subband signals output by the inverse quantization network 516 are respectively written into separate segments of a field memory unit 518 . The size of each segment is a quarter of the size of the full-field memory, because the image size is reduced by a factor of 4 after horizontal and vertical 10:1 downscaling by a factor of 2 in the encoder. When each field memory segment is filled with data, the output subband signals Y'LL', Y'LH', Y'HL and Y'HH are applied to a quadrature mirror filter (QMF) decoder Network 519 to generate difference signal ΔY' output.

多路分解量化辅助色度各副通道信号,系由单元515提供至-I、Q处理器网络520,其线路配置与包括516、518和519各单元之亮度信号处理相同。处理器520之输出信号包括各场序信号△I′、△Q′,利用单元522将各该信号按因数2关系加以垂直伸展处理。伸展器522输出之信号△I′和△Q′之原始时间关系,利用一网络予以重新建立,该网络包括场同步之各开关524、530和532,以及场延迟网络525和526,如图所示。The demultiplexed and quantized auxiliary chrominance sub-channel signals are provided by the unit 515 to the -I, Q processor network 520, and its circuit configuration is the same as that of the luminance signal processing including the units 516, 518 and 519. The output signal of the processor 520 includes the field sequence signals ΔI′, ΔQ′, and the unit 522 performs vertical stretch processing on each of the signals according to the factor 2 relationship. The original time relationship of the signals ΔI' and ΔQ' output by the stretcher 522 is re-established by a network comprising the respective switches 524, 530 and 532 of the field synchronization, and the field delay networks 525 and 526, as shown in the figure Show.

亮度QMF解码器519之详细方框图如图6所示。QMF解码器519将四个亮度副频带信号重组合为一单场之亮度差异信号图像信息。每一副频带之信号分别由单元610、611、612和613予以垂直伸展(向上采样)。此项处理系在每一频带之每两行之间插入一条零值行之方式完成之。垂直伸展后之各频带信号再经图中之各低通与高通垂直滤波器614~617之滤波。此等滤波器之操作参数与发射机编码器中之各相对垂直滤波器之参数相同。滤波器614和615之输出信号于一混合器618中以减法方式混合,再于单元620中被乘以因数2。同样地,滤波器616和617输出之信号,则于一混合器619中以减法方式混合,再于单元621中被乘以因数2。A detailed block diagram of the luma QMF decoder 519 is shown in FIG. 6 . The QMF decoder 519 reassembles the four luminance subband signals into a single field of luminance difference signal image information. The signals of each sub-band are vertically stretched (up-sampled) by units 610, 611, 612 and 613, respectively. This is done by inserting a row of zeros between every two rows for each frequency band. The vertically extended signals of each frequency band are then filtered by the low-pass and high-pass vertical filters 614-617 in the figure. The operating parameters of these filters are the same as those of the respective vertical filters in the transmitter encoder. The output signals of filters 614 and 615 are subtractively mixed in a mixer 618 and multiplied by a factor of two in unit 620 . Likewise, the signals output by filters 616 and 617 are subtractively mixed in a mixer 619 and multiplied by a factor of two in unit 621 .

混合器620之输出信号于接受单元623水平低通滤波处理前,先于单元622中按因数2之关系接受水平伸展处理。水平向上采样处理系在相邻水平采样信号之间插入一零值采样信号。同样地,混合器621输出之信号,则先由单元624以因数2加以水平伸展处理后,再接受单元625之水平高通滤波处理。经单元623和625滤波后之各信号,于混合器630中以减法方式混合,然后,于单元632中被乘以因数2,以产生输出信号△Y′。乘法器620、621和632是起信号定标元件的功能,以确保该输出信号△Y′含有大致与原始信号△Y亦即未经向上采样和向下采样前之信号所含有之相同能量。The output signal of the mixer 620 is horizontally stretched by a factor of 2 in the unit 622 before being processed by the horizontal low-pass filter in the unit 623 . The horizontal upsampling process inserts a zero-valued sample signal between adjacent horizontal sampled signals. Similarly, the signal output by the mixer 621 is first horizontally stretched by the unit 624 by a factor of 2, and then subjected to the horizontal high-pass filter processing by the unit 625 . The signals filtered by units 623 and 625 are subtractively mixed in mixer 630 and then multiplied by a factor of 2 in unit 632 to generate an output signal ΔY'. Multipliers 620, 621 and 632 function as signal scaling elements to ensure that the output signal ΔY' contains approximately the same energy as the original signal ΔY, ie, the signal before upsampling and downsampling.

Claims (10)

1、一种用以产生代表一高清晰度电视(HDTV)图象主信号和辅助信号之系统,其特征在于包括;1. A system for generating main and auxiliary signals representing a high-definition television (HDTV) image, characterized in that it comprises; 一电视视频信号源(110),其信号代表HDTV图像信息,其细节度实质上高于一传统电视影像之细节度;A television video signal source (110), the signal representing HDTV image information, the detail of which is substantially higher than that of a traditional television image; 第一信号处理装置(114),耦合至上述信号源,用以产生一主视频信号,代表一加强图像,其细节度较高于传统式视频图象,但低于一HDTV视频图像;a first signal processing means (114), coupled to said signal source, for generating a main video signal representing an enhanced image with a degree of detail higher than that of a conventional video image but lower than that of an HDTV video image; 用以产生一辅助数字差异信号之装置(140),该信号代表上述来自信号源之电视信号和上述主视频信号间之差异;means (140) for generating an auxiliary digital difference signal representing the difference between said television signal from said source and said main video signal; 第二信号处理装置(142),响应于上述差异信号,用以产生一转变后之辅助差异信号,该信号处理装置包括:The second signal processing device (142), in response to the above-mentioned difference signal, is used to generate a converted auxiliary difference signal, and the signal processing device includes: (a)用以将上述差异信号分离为多个数字式副频带信号的装置,该信号包括主要含有图像边缘资料之多个副频带信号;及(a) means for separating said difference signal into a plurality of digital subband signals comprising a plurality of subband signals mainly containing image edge data; and (b)数字数据压缩装置,利用数字压缩方法处理上述各副频带信号。(b) A digital data compressing device for processing each sub-band signal described above by a digital compressing method. 2、根据权利要求1的系统,其特征在于其中之分离装置包括一正交镜象波波器。2. The system of claim 1 wherein the separating means comprises a quadrature mirror wave filter. 3、根据权利要求1的系统,其特征在于其中之数字数据压缩装置包括:3. The system according to claim 1, wherein said digital data compression means comprises: 量化处理上述各副频带信号之装置;及A device for quantizing and processing the above-mentioned sub-band signals; and 哈夫曼编码装置,响应于上述量化装置输出之量化后各副频带信号。The Huffman coding means responds to the quantized sub-band signals output by the quantization means. 4、根据权利要求1的系统,其特征在于其中来自信号源之电视信号代表宽屏HDTV图象信息。4. The system of claim 1 wherein the television signal from the source represents widescreen HDTV image information. 5、一种接收电视信号之系统,该电视信号包括一主视频信号成份,代表扩充清晰度之电视图象,其细节度高于一传统式视频图像;另有一辅助信号成份,包括用以增强上述扩充清晰度电视图像,该辅助信号成份内含多个副频带信号,其中包括主要含有图像边缘信息之多个副频带信号;该系统包括下列装置:5. A system for receiving a television signal, the television signal comprising a main video signal component representing an expanded definition television image with higher detail than a conventional video image; and an auxiliary signal component comprising an enhanced For the above-mentioned extended definition television image, the auxiliary signal component contains a plurality of sub-band signals, including a plurality of sub-band signals mainly containing image edge information; the system includes the following devices: 第一装置(202,204),将上述主信号成份处理后产生一代表扩充清晰度图像之主要图像信号信息;First means (202, 204), for generating a main image signal information representing an enhanced definition image after processing the main signal components; 第二装置(222、206),将上述辅助信号处理后产生代表上述扩充清晰度图像增强信息之辅助信息;及The second device (222, 206) generates auxiliary information representing the above-mentioned enhanced definition image enhancement information after processing the above-mentioned auxiliary signal; and 用于将上述主要图象信号信息和上述增强信息混合后产生一代表增强扩充清晰度图像之输出信号的装置(208、210、212)。Means (208, 210, 212) for combining said primary image signal information with said enhancement information to produce an output signal representative of an enhanced extended definition image. 6、根据权利要求5的系统,其特征在于其中之第二信号处理装置包括;6. The system according to claim 5, wherein said second signal processing means comprises; 以数字方式扩充上述各副频带信号中所含数据之装置;及Means for digitally expanding the data contained in the above-mentioned sub-band signals; and 将上述各扩充的副频带信号混合之装置。A device for mixing the above-mentioned extended sub-band signals. 7、根据权利要求6的系统,其特征在于其中之混合装置包括一正交镜象滤波器。7. A system according to claim 6, wherein the mixing means comprises a quadrature mirror filter. 8、根据权利要求1或5的系统,其特征在于其中上述多个副频带信号包括一主要含有水平边缘信息之第一成份,和一主要含有主要垂直边缘信息之第二成份。8. A system according to claim 1 or 5, wherein said plurality of subband signals comprise a first component mainly containing horizontal edge information, and a second component mainly containing mainly vertical edge information. 9、根据权利要求2或8的系统,其特征在于其中上述多个副频带信号包括一第三成份,内含限定对角边缘信息的大量之水平与垂直信息。9. A system according to claim 2 or 8, wherein said plurality of subband signals includes a third component containing a substantial amount of horizontal and vertical information defining diagonal edge information. 10、根据权利要求3或9的系统,其特征在于其中上述多个频带信号包括内含水平低频信息和垂直低频信息的另一成份。10. A system according to claim 3 or 9, wherein said plurality of frequency band signals comprise another component comprising horizontal low frequency information and vertical low frequency information.
CN 90102435 1989-04-24 1990-04-23 Television systems employing multiple transmission channels Pending CN1046827A (en)

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