JPH01141494A - Digital transmitting method for color video signal - Google Patents
Digital transmitting method for color video signalInfo
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- JPH01141494A JPH01141494A JP62301011A JP30101187A JPH01141494A JP H01141494 A JPH01141494 A JP H01141494A JP 62301011 A JP62301011 A JP 62301011A JP 30101187 A JP30101187 A JP 30101187A JP H01141494 A JPH01141494 A JP H01141494A
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- 238000000034 method Methods 0.000 title claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000013144 data compression Methods 0.000 abstract description 14
- 238000000926 separation method Methods 0.000 abstract description 6
- 230000002542 deteriorative effect Effects 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 description 29
- 238000001228 spectrum Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 238000009826 distribution Methods 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明はカラービデオ信号のデジタル伝送方法、特に輝
度信号と搬送色信号とを多重した、所ｍ＋ｆコンポジッ
トカラービデオ信号をデジタル伝送するカラービデオ信
号デジタル伝送方法に関するものである。Detailed Description of the Invention <Industrial Application Field> The present invention relates to a method for digitally transmitting a color video signal, and particularly to a color video signal for digitally transmitting an m+f composite color video signal in which a luminance signal and a carrier color signal are multiplexed. It relates to a digital transmission method.
〈従来の技術〉
一般に、搬送色信号を輝度信号の高域に多重した、所謂
コンポジットビデオ信号をデジタル伝送する場合、デジ
タル化されたコンポジットビデオ信号として伝送する方
法と、夫々デジタル化された輝度信号及び２種の色差信
号として伝送する等複数のベースバンドデジタル信号と
して伝送する方法とか考えられる。<Prior Art> In general, when digitally transmitting a so-called composite video signal in which a carrier color signal is multiplexed on the high frequency band of a luminance signal, there are two methods: one is to transmit a digitized composite video signal, and the other is to transmit a digitized luminance signal. Alternatively, a method of transmitting as a plurality of baseband digital signals, such as transmitting as two types of color difference signals, may be considered.
第３図は前者の手法、所謂コンポジットデジタルビデオ
信号を伝送する手法を用いた従来の伝送装置の一例を示
す図で、入力端子Ｖ ｉ ｎにはコンポジットビデオ信
号が入力されている。FIG. 3 is a diagram showing an example of a conventional transmission device using the former method, a method for transmitting a so-called composite digital video signal, in which a composite video signal is input to the input terminal V i n.
１８はクロック発生器てあり、入力されたコンポジット
ビデオ信号中のカラーバースト信号を抽出し、該カラー
バースト信号に同期した色副搬送波周波数の３倍もしく
は４倍の周波数を有するサンプリングクロックを出力す
る。１７はアナログ−デジタル（Ａ／Ｄ）変換器であり
入力されたコンポジットビデオ信号を上記サンプリンク
クロックでＡ／Ｄ変換する。デジタル化されたコンポジ
ットビデオ信号は画像データ圧縮回路１９に入力され画
像の相関、冗長性を利用してデータ量を減らした後伝送
する。A clock generator 18 extracts a color burst signal from the input composite video signal and outputs a sampling clock having a frequency three or four times the color subcarrier frequency synchronized with the color burst signal. Reference numeral 17 denotes an analog-to-digital (A/D) converter which A/D converts the input composite video signal using the sample link clock. The digitized composite video signal is input to an image data compression circuit 19, and the amount of data is reduced using image correlation and redundancy before being transmitted.
第４図は後者の手法、所謂コンポーネントデジタルビデ
オ信号を伝送する手法を用いた従来の伝送装置の一例を
示す図である０図中入力端子Ｖｉｎには第３図と同様コ
ンポジットビデオ信号か入力されている。２０．２１は
第３図と同様のＡ／Ｄ変換器、クロック発生器であり、
Ａ／Ｄ変換器２０からは色副搬送波の３倍もしくは４倍
の周波数でサンプリングされたコンポジットデジタルビ
デオ信号が出力される。Ｙ／Ｃ分敲分路回路２２輝度信
号成分と搬送色信号成分とを抽出する回路で１周知の如
くデジタルの空間フィルタ（くシ形フィルタ）や時空間
フィルタにより構成されている。該Ｙ／Ｃ分離回路２２
で抽出された搬送色信号成分は同期検波回路２３に於て
、クロック発生器２１の出力するクロックに基づいて同
期検波され、■軸、Ｑ軸上の２つの色差信号（１，Ｑ）
に分離される。画像データ圧縮回路２４はＹ／Ｃ分離回
路２２から得られる輝度信号Ｙ及び同期検波回路２３か
ら得られる２種の色差信号１．Ｑを入力し、必要な情報
量に従って各信号を画像の相関を用いてデータ圧縮し、
更にこれらを時分割多重、所ＢＨＩ Ｔ ＣＩ化して伝
送路へ出力する。FIG. 4 is a diagram showing an example of a conventional transmission device using the latter method, a method for transmitting so-called component digital video signals. In FIG. 4, a composite video signal is input to the input terminal Vin as in FIG. ing. 20.21 is an A/D converter and a clock generator similar to those in FIG.
The A/D converter 20 outputs a composite digital video signal sampled at a frequency three or four times that of the color subcarrier. Y/C branch circuit 22 This is a circuit for extracting the luminance signal component and the carrier color signal component, and is constituted by a digital spatial filter (comb-shaped filter) and a spatio-temporal filter, as is well known. The Y/C separation circuit 22
The carrier color signal component extracted is synchronously detected in the synchronous detection circuit 23 based on the clock output from the clock generator 21, and two color difference signals (1, Q) on the ■ axis and the Q axis are generated.
separated into The image data compression circuit 24 receives a luminance signal Y obtained from the Y/C separation circuit 22 and two types of color difference signals 1. Input Q, data compress each signal using image correlation according to the required amount of information,
Furthermore, these are time-division multiplexed, BHI TCI, and output to the transmission path.
〈発明が解決しようとする問題点〉
しかしながら第３図に示す如き装置によりコンポジット
デジタルビデオ信号を伝送する場合、コンポジットデジ
タルビデオ信号の高域には色副搬送波を中心に搬送色信
号成分が多重されているため１画像の冗長性を利用して
データ量を減らす際に用いられる、隣接画素間の相関か
減少ｔノてしまう。そこで色副搬送波の位相を考慮する
と、相関の強い画素が３もしくは４画素離れた位首に存
在するためこれらの間の相関を利用することも考えられ
るが１画素間の距離か長くなり、データ圧縮率を上げよ
うとすると画質の劣化か大きくなる欠点があった。<Problems to be Solved by the Invention> However, when a composite digital video signal is transmitted by a device such as that shown in FIG. Therefore, the correlation between adjacent pixels, which is used to reduce the amount of data by utilizing the redundancy of one image, is reduced. Therefore, when considering the phase of the color subcarrier, pixels with strong correlation exist at positions 3 or 4 pixels apart, so it is possible to use the correlation between them, but the distance between each pixel becomes long, and the data There was a drawback that increasing the compression rate resulted in the image quality deteriorating or becoming larger.
また第４図に示す如き装置によりコンポーネントデジタ
ルビデオ信号を伝送する場合１画像の冗長性を利用して
データ量を減らした際の画質の劣化は少なくなるが、コ
ンポジット信号をコンポーネント化する場合、多重され
ている搬送色信号と輝度信号を分離するＹ／Ｃ分離回路
か必要である。完全なＹ／Ｃ分離にはフレーム間くし形
フィルタやフィールド間くし形フィルタ、フィールド内
くし形フィルタなどにより得られるデータを、画像の動
きに応じて適応的に加重和する処理か必要となり、複数
のフレームメモリや処理回路など、ハート規模か大きく
なる欠点がある。Furthermore, when transmitting a component digital video signal using the device shown in Fig. 4, there is less deterioration in image quality when the amount of data is reduced by utilizing the redundancy of one image, but when converting a composite signal into components, multiple A Y/C separation circuit is required to separate the carrier color signal and luminance signal. Complete Y/C separation requires processing that adaptively weights and sums data obtained by interframe comb filters, interfield comb filters, intrafield comb filters, etc. according to the movement of the image. There are drawbacks to the frame memory and processing circuits, which are larger than the heart size.
本発明は上述の如き問題に鑑み、コンポジットカラービ
デオ信号をデジタル伝送するに際して、ハード構成を簡
略化し、かつ画質劣化を伴なうことなくデータ圧縮を行
なうことのできるカラービデオ信号のデジタル伝送方法
を提供することを目的としてしする。In view of the above-mentioned problems, the present invention provides a method for digitally transmitting a color video signal that can simplify the hardware configuration and perform data compression without deteriorating image quality when digitally transmitting a composite color video signal. for the purpose of providing.
く問題点を解決するための手段〉
かかる目的下に於て本発明によれば輝度信号と搬送色信
号を含むカラービデオ信号を、前記輝度信号の低域成分
を含む低域信号と、前記輝度信号の高域成分及び前記搬
送色信号の少なくとも一部を含む高域信号とに帯域分離
し、該高域信号を前記搬送色信号の色副搬送波周波数に
基づき色復調して得た２種の信号と、前記低域信号とを
夫々デジタル信号として伝送するカラービデオデジタル
伝送方法か提示される。According to the present invention, a color video signal including a luminance signal and a carrier color signal is combined with a low-frequency signal containing a low-frequency component of the luminance signal, and a low-frequency signal containing a low-frequency component of the luminance signal. Two types of signals are obtained by band-separating the signal into a high-frequency component and a high-frequency signal containing at least a part of the carrier color signal, and color demodulating the high-frequency signal based on the color subcarrier frequency of the carrier color signal. A color video digital transmission method is presented in which the signal and the low-frequency signal are respectively transmitted as digital signals.
く作用〉
上述の如く構成することにより、上記帯域分離は空間フ
ィルタや時空間フィルタ等を用いず一次元のフィルムの
みで実現できるため回路構成は簡略化できる。また低域
信号は輝度信号成分の大部分、高域信号は搬送色信号成
分の大部分を占めているため、データ圧縮に必要な隣接
画素間の相関は大きく１画像を劣化させることなくデー
タ圧縮することが可能となった。Effect> By configuring as described above, the band separation can be realized using only a one-dimensional film without using a spatial filter or a spatio-temporal filter, so that the circuit configuration can be simplified. In addition, since the low-frequency signal occupies most of the luminance signal component and the high-frequency signal occupies most of the carrier color signal component, the correlation between adjacent pixels required for data compression is large, and data can be compressed without deteriorating one image. It became possible to do so.
〈実施例〉
以下、本発明の一実施例について第１図（Ａ）、（Ｂ）
、第２図（Ａ）〜（Ｅ）を用いて説明する。第１図（Ａ
）、（Ｂ）は本発明の一実施例としての送信装置、受信
装置を示す図、第２図（Ａ）〜（Ｅ）は第１図番部の信
号のスペクトラム分布を示す図である。<Example> Hereinafter, an example of the present invention will be shown in Figs. 1 (A) and (B).
, will be explained using FIGS. 2(A) to 2(E). Figure 1 (A
) and (B) are diagrams showing a transmitting device and a receiving device as an embodiment of the present invention, and FIGS. 2(A) to (E) are diagrams showing the spectrum distribution of the signal in the numbered part of the first diagram.
第１図に於て入力端子１に入力されたコンポジットビデ
オ信号はＡ／Ｄ変換器３に入力される。クロック発生器
２は前述の第３図、第４図の例と同様に入力されたアナ
ログコンポジットビデオ信号のカラーパースト信号に同
期した３ｆｓｃ （ｆｓｃは色副搬送波周波数）もしく
は４ｆｓｃのサンプリンタクロックを発生し。In FIG. 1, a composite video signal input to an input terminal 1 is input to an A/D converter 3. The clock generator 2 generates a 3fsc (fsc is the color subcarrier frequency) or 4fsc sampler clock synchronized with the color burst signal of the input analog composite video signal, as in the examples shown in FIGS. 3 and 4 above. death.
該サンプリングクロックによってＡ／Ｄ変換器３は入力
されたコンポジットビデオ信号をデジタル化する。The A/D converter 3 digitizes the input composite video signal using the sampling clock.
このＡ／Ｄ変換器３の出力するデジタル信号のスペクト
ラム分布を第２図（Ａ）に示す。ここでは入力されるコ
ンポジット信号としてＮＴＳＣテレビジョン信号を例に
とっている。The spectrum distribution of the digital signal output from this A/D converter 3 is shown in FIG. 2(A). Here, an NTSC television signal is taken as an example of the input composite signal.
図中１４は輝度信号のスペクトラム、１５゜１６は搬送
色信号のスペクトラムを夫々示し、１５はＩ ａｋの色
差信号のスペクトラム、１６はＱ軸の色差信号のスペク
トラムな夫々示す。In the figure, reference numeral 14 indicates the spectrum of the luminance signal, reference numerals 15 and 16 indicate the spectrum of the carrier color signal, 15 indicates the spectrum of the Iak color difference signal, and 16 indicates the spectrum of the Q-axis color difference signal.
Ａ／Ｄ変換器３の出力するデジタルコンポジ・シトビデ
オ信号は低域通過フィルタ（ＬＰＦ）４及び遅延回路５
に供給される。第２図（Ｂ）はこのＬＰＦ４の出力信号
のスペクトラム分布を示す。今、ＬＰＦ４のカットオフ
周波数を２．５ＭＨｚ程度に設定し、かり搬送色信号中
の色差信号か広帯域のものであると、■軸の色差信号成
分かＬＰＦ４の出力する低域信号に含まれることになる
。但し、このＬＰＦ４の出力する低域信号に含まれるＩ
軸の色差信号成分はエネルギー的には小さなものである
。このＬＰＦ４の出力する低域信号は疑似輝度信号（図
中Ｙ′に示す）として画像データ圧縮回路８及び減算器
６に供給される。The digital composite video signal output from the A/D converter 3 is passed through a low pass filter (LPF) 4 and a delay circuit 5.
is supplied to FIG. 2(B) shows the spectrum distribution of the output signal of this LPF 4. Now, if the cutoff frequency of LPF4 is set to about 2.5MHz, and the color difference signal in the carrier color signal is a broadband one, the color difference signal component of the ■ axis will be included in the low frequency signal output from LPF4. become. However, the I included in the low frequency signal output from this LPF4
The axial color difference signal component is small in energy. The low frequency signal output from the LPF 4 is supplied to the image data compression circuit 8 and the subtracter 6 as a pseudo luminance signal (indicated by Y' in the figure).
遅延回路５はＬＰＦ４によって生じる時間遅れ分の遅延
時間を有する遅延回路であり、減算器６は該遅延回路５
の出力信号から前出のＬＰＦ４の出力信号を減算して、
ＬＰＦ４で分離されなかった高域信号を抽出する。該減
算器６により得た高域信号のスペクトラム分布は第２図
（Ｃ）に示す通りであり、図中の如く２．５ＭＨｚ以上
の輝度信号成分１４及び搬送色信号中のＩ軸の色差信号
成分１５．Ｑ軸の色差信号成分を含んている。The delay circuit 5 is a delay circuit having a delay time equal to the time delay caused by the LPF 4, and the subtracter 6 is a delay circuit having a delay time corresponding to the time delay caused by the LPF 4.
Subtract the output signal of LPF4 mentioned above from the output signal of
Extract the high frequency signal that was not separated by LPF4. The spectrum distribution of the high frequency signal obtained by the subtracter 6 is as shown in FIG. Ingredient 15. Contains Q-axis color difference signal components.
同期検波回路７では２．５ＭＨｚ以上の輝度信号成分を
含んだ状態て同期検波を行ない。The synchronous detection circuit 7 performs synchronous detection in a state including luminance signal components of 2.5 MHz or higher.
■輛、ＱＩＲ１１で高域信号を色復調する。この色復調
された２つの信ｔ）は疑似■軸色差信号Ｉ′、疑似Ｑ他
色差信号Ｑ′としてデータ圧縮回路に供給される。これ
らの信号のスペクトラム分布は夫々第２図（Ｄ）、（Ｅ
）に示し、疑似Ｉ他色差信号■′のスペクトラム１５′
、疑似Ｑ他色差信号Ｑ゛のスペクトラムには高域輝度信
号のスペクトラムに係るスペクトラムか含まれている。■ Color demodulates the high frequency signal using QIR11. The two color-demodulated signals t) are supplied to the data compression circuit as a pseudo-black color difference signal I' and a pseudo-Q color difference signal Q'. The spectral distributions of these signals are shown in Figures 2 (D) and (E), respectively.
), the spectrum 15' of the pseudo I other color difference signal ■'
, the spectrum of the pseudo-Q color difference signal Q′ includes a spectrum related to the spectrum of the high-band luminance signal.
画像データ圧縮回路８では疑似輝度信号Ｙ′疑似色差信
号１′、Ｑ’をコンポーネント信号として第４図に於け
る輝度信号Ｙ１色差信号１、Ｑと同様に取扱い、画像の
相関性（冗長度）を利用してデータ圧縮し、更にＴＣＩ
化して出力する。この出力信号は伝送信号として、磁気
記録再生系や通信路等の伝送路へ出力されることになる
。In the image data compression circuit 8, the pseudo luminance signal Y' and the pseudo color difference signal 1' and Q' are treated as component signals in the same manner as the luminance signal Y1 and the color difference signal 1 and Q in FIG. 4, and the correlation (redundancy) of the image is calculated. data compression using TCI
Convert and output. This output signal is output as a transmission signal to a transmission path such as a magnetic recording/reproducing system or a communication path.
第１図（Ｂ）は第１図（Ａ）の送信装着により伝送路へ
送出された信号を受信する受信装置の構成例を示す図で
ある。伝送路から入力された信号は画像データ伸長回路
２５に入力され、時間軸多重されていた信号を３系統の
信号とし、更にこれらの信号の夫々に画像データ圧縮回
路８で行なった処理と逆の処理を施すことにより、疑似
輝度信号Ｙ′疑似色差信号■′。FIG. 1(B) is a diagram showing a configuration example of a receiving device that receives a signal sent to a transmission path by the transmitting device shown in FIG. 1(A). The signal input from the transmission path is input to the image data decompression circuit 25, which converts the time-axis multiplexed signal into three systems of signals, and further processes each of these signals in the opposite way to the process performed by the image data compression circuit 8. By performing the processing, a pseudo luminance signal Y' and a pseudo color difference signal ■' are obtained.
Ｑ′を復元する。疑似色差信号１’、Ｑ’は平衡変調回
路２７に供給され、周知の直角２相変調かデジタル信号
状態で行なわれる。この時の搬送波の周波数はｆｓｃで
あり、クロック発生器２６からの周波数ｆｓｃの基準ク
ロックが平衡変調回路２７に与えられる。この平衡変調
口 ゛路２７の出力信号は第２図（Ｃ）の如きスペクト
ラム分布を有するデジタル高域信号となる。Restore Q'. The pseudo color difference signals 1' and Q' are supplied to a balanced modulation circuit 27 and are subjected to well-known quadrature two-phase modulation or digital signal state. The frequency of the carrier wave at this time is fsc, and a reference clock of frequency fsc from the clock generator 26 is given to the balanced modulation circuit 27. The output signal of this balanced modulation port 27 becomes a digital high frequency signal having a spectrum distribution as shown in FIG. 2(C).
この高域信号が輝度信号の高域成分を含んでいるのは言
うまでもない。この高域信号は低域信号としての疑似輝
度信号と加算器２８で加算され、元のコンポジットデジ
タルビデオ信号を得る。It goes without saying that this high-frequency signal includes high-frequency components of the luminance signal. This high-frequency signal is added to the pseudo-luminance signal as a low-frequency signal in an adder 28 to obtain the original composite digital video signal.
コンポジットデジタルビデオ信号はクロック発生器２６
の出力するクロックにより
３ｆｓｃもしくは４ｆｓｃで動作するＤ／Ａ変換器２９
によってア→゛ロク化され、コンポジットビデオ信号と
して出力される。The composite digital video signal is clocked into the clock generator 26.
D/A converter 29 that operates at 3 fsc or 4 fsc depending on the clock output from
The video signal is converted into an analog signal and output as a composite video signal.
このようにコンポジットビデオ信号をデータ圧縮してデ
ジタル伝送する際に、上記実施例では、前記コンポジッ
トビデオ信号の高域に多重されたエネルギーの大きな色
副搬送波成分をベースバントに落すことにより画像のデ
ータ圧縮の際の画質の劣化を最小限に押えることができ
、またコンポジットビデオ信号を、完全なコンポーネン
トビデオ信号に変換するのに比べて、ハード量を格段に
少なくすることがてきる。When data compressing a composite video signal and transmitting it digitally, in the above embodiment, the image data is compressed by dropping the high-energy color subcarrier component multiplexed in the high frequency range of the composite video signal into the baseband. Deterioration in image quality during compression can be kept to a minimum, and the amount of hardware can be significantly reduced compared to converting a composite video signal into a complete component video signal.
尚、上記実施例に於てはコンポジットアナログビデオ信
号をＡ／Ｄ変換し、デジタルコンポジットビデオ信号を
デジタル低域信号とデジタル高域信号に分離し、更にデ
ジタル高域信号を色復調してデジタル疑似色差信号を得
ているが、Ａ／Ｄ変換回路はデータ圧縮回路８の前段て
あればどの信号状態てＡ／Ｄ変換しても同様の効果か得
られる。例えばアナログコンポジット信号の状態でアナ
ログ高域信号とアナログ低域信号に分離し、アナログ高
域信号を色復調して２種のアナログ疑似色差信号を得、
アナログ低域信号（疑似輝度信号）及び２Ｍのアナログ
疑似色差信号を夫々Ａ／Ｄ変換した後データ圧縮を行な
う構成とすることも可能である。In the above embodiment, the composite analog video signal is A/D converted, the digital composite video signal is separated into a digital low frequency signal and a digital high frequency signal, and the digital high frequency signal is color demodulated to generate a digital pseudo signal. Although a color difference signal is obtained, if the A/D conversion circuit is provided before the data compression circuit 8, the same effect can be obtained no matter what signal state is used for A/D conversion. For example, an analog composite signal is separated into an analog high frequency signal and an analog low frequency signal, and the analog high frequency signal is color demodulated to obtain two types of analog pseudo color difference signals.
It is also possible to adopt a configuration in which the analog low frequency signal (pseudo luminance signal) and the 2M analog pseudo color difference signal are respectively A/D converted and then data compressed.
また先の実施例てはコンポジットビデオ信号としてＮＴ
ＳＣテレビジョン信号を例として用いたか、他にも所３
ｉ７ Ｐ Ａ Ｌテレビジョン信号や、輝度信号の高精
細成分の垂直周波数を異ならしめ多重した高精細テレビ
ジョン信号の伝送に対して本発明を用いても同様の効果
が得られる。In addition, in the previous embodiment, NT is used as a composite video signal.
I used the SC television signal as an example, or there are 3 other places.
Similar effects can be obtained even when the present invention is applied to the transmission of an i7PAL television signal or a high-definition television signal in which high-definition components of a luminance signal are multiplexed with different vertical frequencies.
〈発明の効果〉
以上説明した様に本発明によれば輝度信号と搬送色信号
を多重したビデオ信号をデジタル伝送するに際し、回路
構成が簡略でかつ画質を損なうことなくデータ圧縮する
ことが可能になった。<Effects of the Invention> As explained above, according to the present invention, when digitally transmitting a video signal in which a luminance signal and a carrier color signal are multiplexed, data compression can be performed with a simple circuit configuration and without deteriorating image quality. became.
第１図（Ａ）、（Ｂ）は本発明の一実施例の構成を示ず
図て、第１図（Ａ）は送信装置、第１図（Ｂ）は受信装
置の構成を示す図、第２図（Ａ）〜（Ｅ）は第１ｌ６部
の信号の周波数スペクトラムを示す図、
第３図は従来の伝送装置の一例を示す図、第４図は従来
の伝送装置の他の例を示す図である。
図中、１はコンポジットビデオ信号の入力端子、３はＡ
／Ｄ変換器、４は低域通過フィルタ、６は減算器、７は
色復調を行なう同期検波回路、８は画像データ圧縮回路
である。1(A) and 1(B) do not show the configuration of an embodiment of the present invention, FIG. 1(A) is a diagram showing the configuration of a transmitting device, and FIG. 1(B) is a diagram showing the configuration of a receiving device. Figures 2 (A) to (E) are diagrams showing the frequency spectrum of the signal in the 1l6 section, Figure 3 is a diagram showing an example of a conventional transmission device, and Figure 4 is a diagram showing another example of the conventional transmission device. FIG. In the figure, 1 is the composite video signal input terminal, 3 is the A
4 is a low-pass filter, 6 is a subtracter, 7 is a synchronous detection circuit for performing color demodulation, and 8 is an image data compression circuit.
Claims (2)
、前記輝度信号の低域成分を含む 低域信号と、前記輝度信号の高域成分およ び前記搬送色信号の少なくとも一部を含む 高域信号とに帯域分離し、該高域信号を前 記搬送色信号の色副搬送波周波数に基づき 色復調して得た２種の信号と、前記低域信 号とを夫々デジタル信号として伝送するカ ラービデオ信号デジタル伝送方法。(1) A color video signal including a luminance signal and a carrier color signal is divided into a low frequency signal including a low frequency component of the luminance signal, and a high frequency signal including a high frequency component of the luminance signal and at least a part of the carrier color signal. A color video signal in which two types of signals obtained by band-separating the high-frequency signal and color demodulating the high-frequency signal based on the color subcarrier frequency of the carrier color signal and the low-frequency signal are transmitted as digital signals, respectively. Digital transmission method.
の輝度信号の低域成分を含む低域 信号と、前記カラービデオ信号中の搬送色 信号の少なくとも一部及び輝度信号の高域 が含まれる高域信号を前記搬送色信号の搬 送周波数に基づいて色復調した２種の信号 とを夫々デジタル信号として伝送されたカ ラービデオ信号を、前記低域信号と前記 ２種の信号に分離し、該２種の信号を直角 ２相変調して得た高域信号と前記低域信号 とを混合してカラービデオ信号を復元する カラービデオ信号デジタル伝送方法。(2) A low frequency signal including a low frequency component of a luminance signal in a color video signal including a luminance signal and a carrier color signal, and a low frequency signal including at least a portion of the carrier color signal and a high frequency component of the luminance signal in the color video signal. separating the color video signal transmitted as a digital signal into the low frequency signal and the two types of signals; A color video signal digital transmission method for restoring a color video signal by mixing a high frequency signal obtained by quadrature two-phase modulation of the two types of signals and the low frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62301011A JP2644510B2 (en) | 1987-11-28 | 1987-11-28 | Color video signal transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62301011A JP2644510B2 (en) | 1987-11-28 | 1987-11-28 | Color video signal transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01141494A true JPH01141494A (en) | 1989-06-02 |
| JP2644510B2 JP2644510B2 (en) | 1997-08-25 |
Family
ID=17891761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62301011A Expired - Fee Related JP2644510B2 (en) | 1987-11-28 | 1987-11-28 | Color video signal transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2644510B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5586279A (en) * | 1978-12-23 | 1980-06-28 | Japan Radio Co Ltd | Color still picture transmission-reception system |
| JPS6055790A (en) * | 1983-09-06 | 1985-04-01 | Mitsubishi Electric Corp | Inter-frame coding device of vector quantization type |
| JPS62230286A (en) * | 1986-03-31 | 1987-10-08 | Matsushita Electric Ind Co Ltd | Digital television receiver |
-
1987
- 1987-11-28 JP JP62301011A patent/JP2644510B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5586279A (en) * | 1978-12-23 | 1980-06-28 | Japan Radio Co Ltd | Color still picture transmission-reception system |
| JPS6055790A (en) * | 1983-09-06 | 1985-04-01 | Mitsubishi Electric Corp | Inter-frame coding device of vector quantization type |
| JPS62230286A (en) * | 1986-03-31 | 1987-10-08 | Matsushita Electric Ind Co Ltd | Digital television receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2644510B2 (en) | 1997-08-25 |
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