JPH01190192A - Color reproducing circuit for color signal high frequency part sequential transmission color tv signal - Google Patents
Color reproducing circuit for color signal high frequency part sequential transmission color tv signalInfo
- Publication number
- JPH01190192A JPH01190192A JP63015098A JP1509888A JPH01190192A JP H01190192 A JPH01190192 A JP H01190192A JP 63015098 A JP63015098 A JP 63015098A JP 1509888 A JP1509888 A JP 1509888A JP H01190192 A JPH01190192 A JP H01190192A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- color
- output
- lpf
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005540 biological transmission Effects 0.000 title description 2
- 238000000034 method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
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- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
り粟上皇剋且分旦
本発明は第１色信号と第２色信号の低域部は両側波帯で
常時送られそれらの信号の高域部は片側波帯で一定期間
ごとに交互に送られる方式のカラーテレビジジン信号を
再生する回路に関する。[Detailed Description of the Invention] According to the present invention, the low frequency parts of the first color signal and the second color signal are always sent in the double-sided band, and the high frequency parts of these signals are sent in the single-sided band. The present invention relates to a circuit for reproducing color television signals that are sent alternately at regular intervals.
従来の技術
現在、このようなカラーテレビジョン信号はＥＤＴＶ
（ｅｘｔｅｎｄｅｄ ｄｅｆｉｎｉｔｉｏｎ ｔｅｌｅ
ｖｉｓｉｏｎ） システムにおける１つの色信号方式
として提案されている。この色信号方式では第５図に示
すように１信号の低域部（０〜０．５ＭＨｚ ） （Ｉ
Ｌ）と、Ｑ信号の低域部（０〜０．５ＭＨｚ ）（ＱＬ
）は両側波帯で全フィールドにわたって伝送されるが、
それらの高域部（ＩＨ） （Ｑｌ（）は１フイールドご
とに交互に送られる。Prior ArtCurrently, such color television signals are called EDTV
(extended definition tele
vision) system has been proposed as one color signal method. In this color signal system, as shown in Figure 5, the low frequency part (0 to 0.5MHz) (I
L) and the low frequency part (0 to 0.5 MHz) of the Q signal (QL
) is transmitted over the entire field in both sidebands, but
These high frequency parts (IH) (Ql() are sent alternately for each field.
即ち、■信号の高域部（ＩＩ）は奇数フィールドに伝送
され、Ｑ信号の高域部（ＱＨ）は偶数フィールドに伝送
される如くフィールド順次式となっているのである。し
かも、その高域部（ＩＨ） （ＱＨ）は両側波帯でなく
、片側波帯である。That is, the high frequency part (II) of the ■ signal is transmitted in the odd field, and the high frequency part (QH) of the Q signal is transmitted in the even field, so that the field sequential system is adopted. Furthermore, the high frequency section (IH) (QH) is not a double-side band but a single-side band.
次に、このような方式のカラーテレビジョン信号を再生
処理する従来の色信号再生回路を第３図及び第４図を参
照して説明する。第３図において、端子（１）に与えら
れた上述の色信号高域部順次伝送方式カラーテレビジョ
ン信号の色信号（Ｃ）は■信号復調器（２）とＱ信号復
調器（３）に入力され、これらの復調器（２） （３）
によってそれぞれＩ軸復調。Next, a conventional color signal reproducing circuit for reproducing color television signals of this type will be explained with reference to FIGS. 3 and 4. In Fig. 3, the color signal (C) of the above-mentioned color signal high-frequency sequential transmission method color television signal applied to the terminal (1) is sent to the signal demodulator (2) and the Q signal demodulator (3). These demodulators (2) (3)
I-axis demodulation by respectively.
Ｑ軸復調を受ける。各復調器（２） （３）の出力側に
は互いに連動する第１．第２の切換えスイッチ（ＳＷ、
）（ｓｈｚ）が配設されている。これらのスイッチ（Ｓ
Ｗ 、 ）（Ｓ６）は奇数フィールド時には（ａ）側に
、偶数フィールド時には（ｂ）側に切り換わる。尚、そ
の切換え制御信号はフィールド判別回路（図示せず）か
ら端子（４）を通して各スイッチ（ｓｗ、） （ＳＷｚ
）に与えられるフィールド判別信号である。第３．第４
切換えスイッチ（Ｓｌ’１３） （ＳＷ４）が出力端子
（５） （６）の前段に設けられているが、これらのス
イッチ（ＳＷ３） （ＳＷ４）も前記切換え信号によっ
て制御され、第１．第２スイツチ（ＳＷｌ） （ＳＷｔ
）と連動して切換わる。Receives Q-axis demodulation. On the output side of each demodulator (2) (3), there are first and second demodulators connected to each other. Second changeover switch (SW,
) (shz) is provided. These switches (S
W, ) (S6) is switched to the (a) side in an odd field and to the (b) side in an even field. The switching control signal is transmitted from the field discrimination circuit (not shown) to each switch (sw, ) (SWz
) is a field discrimination signal given to Third. Fourth
Changeover switches (Sl'13) (SW4) are provided before the output terminals (5) and (6), and these switches (SW3) and (SW4) are also controlled by the changeover signal, and the first . Second switch (SWl) (SWt
).
色信号再生に関し、■信号とＱ信号は同一であるので、
以下■信号についてのみ説明する。第３図のように奇数
フィールド時にはスイッチ（ＳＷｌ）〜（ＳＷ４）はい
ずれも（ａ）側に切換わっている。このときＩ信号復調
器（２）で復調された■信号の帯域は０〜１．５ＭＨｚ
であるが、上述の通り高域部（ＩＩ）は片側波帯で送ら
れているため両側波帯で伝送されている低域部（ＩＬ）
に比し半分の振幅しかない。そこで、高域部（ＩＨ）の
利得を第４図（ａ）の如く２倍にする残留側波帯補正フ
ィルタ（７）を通してＩ信号を出力端子（５）に出力さ
せる。また、Ｉ信号の高域部（ＩＨ）は偶数フィールド
で抜けているため、それを偶数フィールドに補間してや
るための補間回路が設けられるが、その補間回路は第４
図ら）に示す如り０．５〜１．５ＭＨｚの通過帯域をも
つバンドパスフィルタ（８）と、１フイールド遅延回路
（９）と、１ライン遅延回路（１０）と、ストレート線
路（１１）と、加算器（１２）及び（１３）とから成っ
ていて、バンドパスフィルタ（８）で取り出されたＩ信
号の高域部（ＩＨ）を１フイールド遅延回路（９）で１
フイールド遅延して偶数フィールドに生じるようになし
、この遅延信号を１ライン遅延回路（１０）で１ライン
遅延したものとストレート線路（１１）を通ってきたも
のとを加算器（１２）で加算して第４図（Ｃ）の如く振
幅２倍の高域信号を形成する。この補間用の高域信号は
スイッチ（ｓｈ ｌ）〜（ＳＷ４）が（ｂ）側に切り換
わった偶数フィールド時にＩ軸復調器（２）から第４図
（ｄ）に示すような通過特性を有するローパスフィルタ
（１４）を通して与えられるＩ信号の低域部（ＩＬ）と
加算器（１３）において加算され第４図（ｅ）に示す如
き特性の信号が１倍号出力端子（５）に出力される。Regarding color signal reproduction, ■signal and Q signal are the same, so
Below, only the ■signal will be explained. As shown in FIG. 3, when the field is an odd number, the switches (SW1) to (SW4) are all switched to the (a) side. At this time, the band of the ■ signal demodulated by the I signal demodulator (2) is 0 to 1.5 MHz.
However, as mentioned above, since the high frequency part (II) is transmitted in one side band, the low frequency part (IL) is transmitted in both side bands.
It has only half the amplitude compared to . Therefore, the I signal is outputted to the output terminal (5) through a residual sideband correction filter (7) that doubles the gain of the high frequency section (IH) as shown in FIG. 4(a). Also, since the high frequency part (IH) of the I signal is missing in the even field, an interpolation circuit is provided to interpolate it to the even field.
As shown in the figure, a bandpass filter (8) with a passband of 0.5 to 1.5MHz, a 1-field delay circuit (9), a 1-line delay circuit (10), and a straight line (11) are used. , adders (12) and (13), and the high frequency part (IH) of the I signal extracted by the bandpass filter (8) is processed by a one-field delay circuit (9).
This delayed signal is delayed by one line so that it occurs in an even field, and the one line delayed by the one line delay circuit (10) and the one that has passed through the straight line (11) are added together by an adder (12). As shown in FIG. 4(C), a high frequency signal with twice the amplitude is formed. This interpolation high-frequency signal is transmitted from the I-axis demodulator (2) to the I-axis demodulator (2) in the even field when the switches (sh l) to (SW4) are switched to the (b) side, and has a pass characteristic as shown in Figure 4 (d). The low frequency part (IL) of the I signal given through the low-pass filter (14) is added in the adder (13), and a signal with characteristics as shown in FIG. 4(e) is output to the 1x output terminal (5). be done.
Ｑ信号については、現信号のフィールドと補間信号のフ
ィールドが上述の場合と異なるだけで、Ｊ信号と同様に
再生処理されＱ信号出力端子（６）に得られる。Regarding the Q signal, the only difference is that the field of the current signal and the field of the interpolated signal are different from the above case, and it is reproduced in the same manner as the J signal and is obtained at the Q signal output terminal (6).
日が”′ しよ゛と る量
しかしながら、上記従来の色信号再生回路では第４図（
ａ）の如き特性を持つ残留側波帯補正フィルタ（７）自
体のハードウェア規模が大きくなり全体としてコスト高
になってしまう、また、この残留側波帯補正フィルタ（
７）の出力特性〔第４図（ａ）〕と補関されたフィール
ドにおける出力特性、即ちバンドパスフィルタ（８）と
ローパスフィルタ（１４）の出力を演算した出力特性〔
第４図（ｅ）〕を全く同じにすることは実際には困難で
あり、特性が異なるとフリッカの原因となり画質を悪く
する。However, in the conventional color signal reproducing circuit described above,
The hardware scale of the vestigial sideband correction filter (7) itself having characteristics such as a) becomes large and the overall cost increases.
The output characteristic in the field interpolated with the output characteristic of 7) [Figure 4 (a)], that is, the output characteristic calculated from the outputs of the band pass filter (8) and the low pass filter (14) [
It is actually difficult to make the characteristics exactly the same as shown in FIG. 4(e), and if the characteristics differ, it will cause flicker and deteriorate the image quality.
本発明はこのような点に鑑みなされたものであって、フ
ィルタの構成が簡単であると共に、フィールド間での特
性が揃った色信号出力を得るようにした色再生回路を提
供することを目的とする。The present invention has been made in view of the above points, and it is an object of the present invention to provide a color reproduction circuit which has a simple filter configuration and which can obtain color signal outputs with uniform characteristics between fields. shall be.
１ を”するための
上記の目的を達成するため本発明では、第１色信号と第
２色信号の低域部は両側波帯で常時送られ該第１色信号
の高域部と第２色信号の高域部は片側波帯で一定期間ご
とに交互に送られる方式のカラーテレビジョン信号を再
生する回路において、前記第１色信号を復調する第１復
調器の出力と第２色信号を復調する第２復調器の出力を
一定期間ごとに交互に受けると共に前記復調器の出力を
高域部まで通過させる第１ローパスフィルタと、前記復
調器の出力を低域部のみ通過させる第２０−パスフイル
タと、前記第１．第２０−パスフィル夕の出力を演算し
て残留側波帯補正を施す第１演算手段と、前記１．第２
０−パスフイルタの出力を演算して補間用の高域部を取
り出す第２演算手段とを設けている。In order to achieve the above-mentioned object of "1", in the present invention, the low frequency parts of the first color signal and the second color signal are always sent in both sidebands, and the high frequency part of the first color signal and the second color signal are constantly transmitted. In a circuit for reproducing a color television signal in which the high frequency part of the color signal is sent alternately at fixed intervals in a single side band, the output of a first demodulator that demodulates the first color signal and the second color signal are combined. a first low-pass filter that alternately receives the output of the second demodulator at regular intervals and passes the output of the demodulator up to the high-frequency range; and a second low-pass filter that passes only the low-frequency range of the output of the demodulator. - a pass filter; a first calculation means for calculating the output of the first and twentieth pass filters to perform residual sideband correction;
A second calculation means is provided for calculating the output of the 0-pass filter and extracting a high frequency part for interpolation.
止−■
このような構成によると、フィルタは単純なローパスフ
ィルタ特性をもったものでよいので、構成が簡単で安価
になる。また、特性の揃った出力を得ることが容易とな
る。-■ According to such a configuration, the filter may have simple low-pass filter characteristics, so the configuration is simple and inexpensive. Moreover, it becomes easy to obtain output with uniform characteristics.
１１１班
本発明を実施した第１図において第３図の従来例と同一
部分には同一の符号を付して重複説明を省略する。本実
施例では残留側波帯補正フィルタと、補間信号取り出し
用バンドパスフィルタを単純なフィルタ特性をもつ１．
５ＭＨｚの第１０−パスフイルタ（１５）及び０．５Ｍ
Ｈ２の第２０−パスフイルタ（１６）と、これらのロー
パスフィルタ（１５） （１６）の出力を演算する演算
手段によって構成している。Group 111 In FIG. 1, in which the present invention is implemented, the same parts as those in the conventional example of FIG. In this embodiment, a vestigial sideband correction filter and a bandpass filter for extracting interpolated signals are used as a filter with simple filter characteristics.
5MHz 10th-pass filter (15) and 0.5M
It is constituted by a 20th-pass filter (16) of H2 and calculation means for calculating the outputs of these low-pass filters (15) and (16).
即ち、第２図（イ）に示すような通過特性を有する第１
０−パスフイルタ（１５）の出力のゲインを第２図（ハ
）の如く２倍回路（１７）で２倍にしてから、該２倍回
路と共に第１演算手段を構成する減算器（１８）に加え
、ここで別途第２図（ロ）に示す通過特性の第２０−パ
スフイルタ（１６）の出力を減算すると、第２図（ニ）
に示す如き特性が減算器（１８）の出力に得られる。こ
のように簡単な構成で第３図の残留側波帯補正フィルタ
（７）の通過帯域特性と同一の出力特性が得られる。In other words, the first
The gain of the output of the 0-pass filter (15) is doubled by the doubling circuit (17) as shown in FIG. In addition, if we subtract the output of the 20th pass filter (16) with the pass characteristic shown in Figure 2 (B), we get Figure 2 (D).
A characteristic as shown in is obtained at the output of the subtractor (18). With this simple configuration, the same output characteristics as the passband characteristics of the vestigial sideband correction filter (7) shown in FIG. 3 can be obtained.
また、第２演算手段を構成する減算器（１９）で前記第
１０−パスフイルタ（１５）の出力から第２０−パスフ
イルタ（１６）の出力を減算するという簡単な構成によ
り第２図（ホ）に示す如き出力特性が得られる。この出
力特性は第３図のバンドパスフィルタ（８）の特性と等
価である。上記第１．第２０−パスフイルタ（１５）
（１６）の特性は単純な通過特性のものでよいので、そ
の構成は極めて簡素なものとなる。また、補間高域部と
ローパスフィルタ（１４）の出力低域部を加算して生成
される加算器（１３）の出力と、減算器（１８）の出力
との各特性を容易に揃えることができ、フィールド間で
の信号ゲインのアンバランスが生じない。Furthermore, by using a simple configuration in which the output of the 20th-pass filter (16) is subtracted from the output of the 10th-pass filter (15) by the subtracter (19) constituting the second calculation means, the result shown in FIG. Output characteristics as shown are obtained. This output characteristic is equivalent to the characteristic of the bandpass filter (8) in FIG. 3. Above 1st. 20th-pass filter (15)
Since the characteristic (16) may be a simple pass characteristic, its configuration is extremely simple. Further, it is possible to easily match the characteristics of the output of the adder (13), which is generated by adding the interpolated high-frequency part and the output low-pass part of the low-pass filter (14), and the output of the subtracter (18). There is no imbalance in signal gain between fields.
尚、本実施例はアナログ信号を扱うように構成すること
もできるし、ディジタル信号を扱うように構成すること
もできる。また、扱う色信号はＩ信号とＱ信号でな（、
Ｒ−Ｙ信号とＢ−Ｙ信号であってもよい。Note that this embodiment can be configured to handle analog signals or can be configured to handle digital signals. Also, the color signals handled are I signal and Q signal (,
It may be the RY signal and the BY signal.
発明の効果
本発明によれば、単純な通過特性をもつ２個のローパス
フィルタを用いると共に、それらの出力を演算すること
によって残留側波帯補正を実現すると共に、補間用の信
号を取り出すことができるので、全体としての構成が簡
単になり、コストも安（つくという効果がある。また、
フィールド間の出力特性を容易に揃えることができ、そ
れによってフリッカを無くすことができる。Effects of the Invention According to the present invention, it is possible to realize residual sideband correction by using two low-pass filters with simple pass characteristics and calculating their outputs, and to extract a signal for interpolation. This has the effect of simplifying the overall configuration and reducing costs.
Output characteristics between fields can be easily made uniform, thereby eliminating flicker.
第１図は本発明を実施した色再生回路のブロック図であ
り、第２図はその各部の特性を示す特性図である。第３
図は従来例のブロック図であり、第４図はそれに関する
特性図である。第５図は扱う色信号を説明するための図
である。
（ＩＬ）・−・Ｉ信号の低域部。
（ＩＨ） −４倍号の高域部。
（ＱＬ）・−・Ｑ信号の低域部。
（ＱＨ） −−・Ｑ信号の高域部。
（２）・・・■信号復調器、（３）−・−Ｑ信号復調器
。
（１５）−・−第１０−パスフイルタ。
（１６）・・・第２０−パスフイルタ。
（１７）・−２倍回路、 （１Ｂ）（１９） −
減算器。FIG. 1 is a block diagram of a color reproduction circuit embodying the present invention, and FIG. 2 is a characteristic diagram showing the characteristics of each part thereof. Third
The figure is a block diagram of a conventional example, and FIG. 4 is a characteristic diagram related thereto. FIG. 5 is a diagram for explaining the color signals handled. (IL) - Low frequency part of I signal. (IH) -4 times higher region. (QL) - Low frequency part of Q signal. (QH) ---High frequency part of Q signal. (2)... ■signal demodulator, (3) ---Q signal demodulator. (15) --- 10th-pass filter. (16)...20th pass filter. (17) -2x circuit, (1B) (19) -
Subtractor.
Claims (1)
時送られ該第１色信号の高域部と第２色信号の高域部は
片側波帯で一定期間ごとに交互に送られる方式のカラー
テレビジョン信号を再生する回路において、前記第１色
信号を復調する第１復調器の出力と第２色信号を復調す
る第２復調器の出力を一定期間ごとに交互に受けると共
に前記復調器の出力を高域部まで通過させる第１ローパ
スフィルタと、前記復調器の出力を低域部のみ通過させ
る第２ローパスフィルタと、前記第１、第２ローパスフ
ィルタの出力を演算して残留側波帯補正を施す第１演算
手段と、前記１、第２ローパスフィルタの出力を演算し
て補間用の高域部を取り出す第２演算手段とを備える色
再生回路。(1) The low-frequency parts of the first color signal and the second color signal are constantly transmitted in both sidebands, and the high-frequency parts of the first color signal and the high-frequency parts of the second color signal are sent in single-sideband at regular intervals. In a circuit for reproducing a color television signal of a method in which the first color signal is demodulated and the output of a second demodulator that demodulates the second color signal are output at regular intervals, a first low-pass filter that alternately receives the output of the demodulator and passes the output of the demodulator up to the high-frequency range; a second low-pass filter that passes only the low-frequency range of the output of the demodulator; and the outputs of the first and second low-pass filters. A color reproducing circuit comprising: a first calculating means for calculating residual sideband correction by calculating the residual sideband correction; and a second calculating means for calculating the outputs of the first and second low-pass filters to extract a high frequency part for interpolation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63015098A JPH01190192A (en) | 1988-01-26 | 1988-01-26 | Color reproducing circuit for color signal high frequency part sequential transmission color tv signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63015098A JPH01190192A (en) | 1988-01-26 | 1988-01-26 | Color reproducing circuit for color signal high frequency part sequential transmission color tv signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01190192A true JPH01190192A (en) | 1989-07-31 |
Family
ID=11879367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63015098A Pending JPH01190192A (en) | 1988-01-26 | 1988-01-26 | Color reproducing circuit for color signal high frequency part sequential transmission color tv signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01190192A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0354282A (en) * | 1989-07-21 | 1991-03-08 | Toyo Ink Mfg Co Ltd | Method of forming pressure-sensitive adhesive sheet and pressure-sensitive adhesive |
| US8241495B2 (en) | 2009-08-28 | 2012-08-14 | Dow Global Technologies Llc | Filtration module including membrane sheet with capillary channels |
| US8641946B2 (en) | 2003-12-12 | 2014-02-04 | Cambridge Enterprise Limited | Extrudate having capillary channels |
-
1988
- 1988-01-26 JP JP63015098A patent/JPH01190192A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0354282A (en) * | 1989-07-21 | 1991-03-08 | Toyo Ink Mfg Co Ltd | Method of forming pressure-sensitive adhesive sheet and pressure-sensitive adhesive |
| US8641946B2 (en) | 2003-12-12 | 2014-02-04 | Cambridge Enterprise Limited | Extrudate having capillary channels |
| US8241495B2 (en) | 2009-08-28 | 2012-08-14 | Dow Global Technologies Llc | Filtration module including membrane sheet with capillary channels |
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