JPS62272794A - Sequential scanning converter for color television signal - Google Patents
Sequential scanning converter for color television signalInfo
- Publication number
- JPS62272794A JPS62272794A JP11672686A JP11672686A JPS62272794A JP S62272794 A JPS62272794 A JP S62272794A JP 11672686 A JP11672686 A JP 11672686A JP 11672686 A JP11672686 A JP 11672686A JP S62272794 A JPS62272794 A JP S62272794A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- analog
- circuit
- converted
- signals
- 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.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
- 230000000750 progressive effect Effects 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 abstract description 8
- 239000003086 colorant Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
3、発明の詳細な説明
発明の目的
産業上の利用分野
この発明は、カラーテレビジョン受像機内に設置される
順次走査変換装置に関するものであり、特にディジタル
処理系の簡易化による低廉化を図った順次走査変換装置
に関するものである。Detailed Description of the Invention 3. Detailed Description of the Invention Purpose of the Invention Industrial Field of Application This invention relates to a progressive scan conversion device installed in a color television receiver, and in particular to a simple digital processing system. This invention relates to a progressive scan conversion device that is designed to be inexpensive by increasing the cost.
従来の技術
最近、テレビジョン受像機内で復調されたアナログ映像
信号を一旦ディジタル映像信号に変換したのち、高機能
化と低価格化の目覚ましいディジタル処理回路を利用し
て順次走査変換による高密度化表示、雑音除去、輪郭補
正など各種の画質改善処理を施し、これを再度アナログ
映像信号に戻して表示することよって表示画面の画質改
善を図ることが試みられるようになってきた。Conventional technology Recently, the analog video signal demodulated in a television receiver is first converted into a digital video signal, and then high-density display is achieved through sequential scan conversion using digital processing circuits that have become highly functional and inexpensive. Attempts have been made to improve the image quality of display screens by performing various image quality improvement processes such as noise removal, contour correction, etc., and then converting the signals back to analog video signals for display.
このような画質改善装置の一つである順次走査変換語N
(スキャン・コンバータ)は、NTSCなど標準テレ
ビジョン方式の飛越走査方式の映像信号の隣接ライン間
にこれらから作成した補間ラインを挿入することにより
フィールド内ライン密度を2倍(ライン周波数31.K
Hz)に高め、画質の改善を図っている。One such image quality improvement device is the progressive scan conversion word N.
(scan converter) doubles the line density in the field (line frequency 31.K
Hz) to improve image quality.
上述の順次走査変換装置は、第2図に示すように構成さ
れている。The above-mentioned progressive scan conversion device is constructed as shown in FIG.
すなわち、入力端子21に供給されるアナログ三原色信
号について回路22において水平AFC,Y/C分翻及
び色復調の各処理が施され、ここから三原色の色差信号
(R−Y)、 (G−Y)。That is, the analog three primary color signals supplied to the input terminal 21 are subjected to horizontal AFC, Y/C conversion, and color demodulation processing in the circuit 22, and from there, the three primary color color difference signals (R-Y), (G-Y ).
(B−Y)と輝度信号Yが出力される。各色差信号と輝
度信号は、加算回路群23a、23b及び23cのそれ
ぞれにおいて加算され、アナログ三原色信号R,G、B
となる。これらアナログ三原色信号のそれぞれは、低域
通過濾波回路24a〜24 cを経てA/D変換回路2
5a〜25cで一旦対応のディジタル三原色信号に変換
され、順次走査変換回路26a〜26cで順次走査変換
処理が行われたのち、D/A変換回路2La〜27cで
順次走査変換処理済みアナログ三原色信号に変換され、
低域通過濾波回路28a〜28Cを経て出力端子29a
〜29Cのそれぞれから後段の表示系に供給される。(B-Y) and a luminance signal Y are output. Each color difference signal and luminance signal are added in addition circuit groups 23a, 23b, and 23c, respectively, and the analog three primary color signals R, G, and B are added.
becomes. Each of these analog three primary color signals is passed through low-pass filter circuits 24a to 24c to the A/D conversion circuit 2.
5a to 25c, the signals are first converted into corresponding digital three primary color signals, sequentially scanned and converted in progressive scan conversion circuits 26a to 26c, and then converted into analog primary color signals that have undergone sequential scan conversion in D/A conversion circuits 2La to 27c. converted,
Output terminal 29a via low-pass filter circuits 28a to 28C
~29C are supplied to the subsequent display system.
発明が解決しようとする問題点
第2図の順次走査変換装置では、三原色信号R1G、
HのそれぞれについてA/D変換回路、順次走査変換
回路及びD/A変換回路から成るディジタル処理系統が
設置されているので、この部分の回路規模が太き(なり
、装置が高価になるという問題がある。Problems to be Solved by the Invention In the progressive scan conversion device shown in FIG. 2, the three primary color signals R1G,
Since a digital processing system consisting of an A/D conversion circuit, a sequential scanning conversion circuit, and a D/A conversion circuit is installed for each of the There is.
発明の構成
問題点を解決するための手段
上記従来技術の問題点を解決する本発明の順次走査変換
装置は、水平AFC回路を通したアナログ・カラーテレ
ビジョン信号を輝度信号と搬送色信号とにY/C分離し
、それぞれをディジタル信号に変換して順次走査変換処
理を施したのち対応のアナログ信号に戻し、この順次走
査変換処理済みのアナログ搬送色信号から3種の色差信
号を復調し、これら色差信号のそれぞれと順次走査変換
処理済みの輝度信号から対応のアナログ三原色信号を作
成することにより、従来装置のディジタル処理系統を1
系統削減し、装置の低廉化を実現するように構成されて
いる。Structure of the Invention Means for Solving the Problems The progressive scan conversion device of the present invention which solves the problems of the prior art described above converts an analog color television signal passed through a horizontal AFC circuit into a luminance signal and a carrier color signal. After separating Y/C and converting each into a digital signal and performing sequential scan conversion processing, it is returned to the corresponding analog signal, and three types of color difference signals are demodulated from this analog carrier color signal that has undergone sequential scan conversion processing, By creating corresponding analog three primary color signals from each of these color difference signals and a luminance signal that has undergone sequential scan conversion processing, the digital processing system of the conventional device can be reduced to one.
It is configured to reduce the number of power systems and reduce the cost of equipment.
以下、本発明の作用を実施例と共に詳細に説明する。Hereinafter, the operation of the present invention will be explained in detail together with examples.
実施例
第1図は、本発明の一実施例に係わるカラーテレビジョ
ン信号の順次走査変換装置の構成を示すブロック図であ
る。Embodiment FIG. 1 is a block diagram showing the configuration of a color television signal progressive scan conversion apparatus according to an embodiment of the present invention.
図中、1は順次走査変換処理対象のカラーテレビジョン
映像信号の入力端子、2は水平AFC回路、3はY/C
分離回路、5a、5bはA/D変換回路、6a、6bは
順次走査変換回路、7a。In the figure, 1 is an input terminal for a color television video signal to be subjected to progressive scan conversion processing, 2 is a horizontal AFC circuit, and 3 is a Y/C circuit.
Separation circuits, 5a and 5b are A/D conversion circuits, 6a and 6b are sequential scan conversion circuits, and 7a.
7bはD/A変換回路、8は低域通過濾波回路、9ば帯
域通過濾波回路、10は色復調回路、11a、Ilb、
llcは加算回路、12a、12b。7b is a D/A conversion circuit, 8 is a low-pass filter circuit, 9 is a band-pass filter circuit, 10 is a color demodulation circuit, 11a, Ilb,
llc is an adder circuit, 12a, 12b.
12 c I=才順次走査変換処理済み三原色信号の出
力端子である。12 c I=output terminal for three primary color signals subjected to sequential scan conversion processing.
入力端子1にはNTSC方式など標準テレビジョン方式
の飛越し走査方式のアナログ映像信号が供給される。こ
のアナログ映像信号がビデオ・テープレコーダなどの記
録媒体から再生されたものであれば、磁気テープの走行
系の機構的揺らぎなどによってラインごとのシックが生
じている。このアナログ映像色差信号は、各ラインの水
平同期信号を基準にして位相ロックを行い上記ジッタの
軽減を図る水平AFC回路2を通してY/C分離回路3
に供給される。An input terminal 1 is supplied with an analog video signal of an interlaced scanning system of a standard television system such as the NTSC system. If this analog video signal is reproduced from a recording medium such as a video tape recorder, line-by-line sick may occur due to mechanical fluctuations in the magnetic tape running system. This analog video color difference signal is passed through a Y/C separation circuit 3 through a horizontal AFC circuit 2 that performs phase locking based on the horizontal synchronization signal of each line to reduce the jitter.
supplied to
Y/C分離回路3において、低域通過濾波回路3aから
輝度信号Yが抽出されると共に、色副搬送波周波数に等
しい中心周波数を有する帯域通過濾波回路3bから、搬
送色信号Cが抽出される。In the Y/C separation circuit 3, a luminance signal Y is extracted from a low-pass filter circuit 3a, and a carrier color signal C is extracted from a band-pass filter circuit 3b having a center frequency equal to the color subcarrier frequency.
Y/C分離回路3で抽出・分離されたアナログ輝度信号
Yは、A/D変換回路5aでディジタル輝度信号に変換
されたのち順次走査変換回路6aに供給される。順次走
査変換回路6aは、飛越走査方式のディジタル輝度信号
の隣接ライン間にこれらから作成した輝度信号の補間ラ
インを挿入することにより輝度信号のフィールド内ライ
ン密度を2倍に高める順次走査変換処理を行う。順次走
査変換処理済みのディジタル輝度信号は、D/A変換回
路7aにおいて対応のアナログ輝度信号に変換されたの
ち低域通過濾波回路8を経て加算回路群11a〜Ilc
の輝度信号入力端子に供給される。The analog luminance signal Y extracted and separated by the Y/C separation circuit 3 is converted into a digital luminance signal by the A/D conversion circuit 5a, and then supplied to the sequential scan conversion circuit 6a. The progressive scan conversion circuit 6a performs a progressive scan conversion process that doubles the in-field line density of the luminance signal by inserting an interpolation line of the luminance signal created from the adjacent lines of the digital luminance signal of the interlaced scanning method. conduct. The digital luminance signal that has undergone the progressive scanning conversion process is converted into a corresponding analog luminance signal in the D/A conversion circuit 7a, and then passes through the low-pass filter circuit 8 to the adder circuit groups 11a to Ilc.
is supplied to the luminance signal input terminal of.
一方、Y/C分離回路3で抽出・分離されたアナログ搬
送色信号Cは、A/D変換回路5bでディジタル搬送色
信号に変換されたのち順次走査変換回路6aに供給され
る。順次走査変換回路6bは、飛越走査方式のディジタ
ル搬送色信号の隣接ライン間にこれらから作成した搬送
色信号の補間ラインを挿入することにより搬送色信号の
フィールド内ライン密度を2倍(ライン周波数31.5
K11z)に高める順次走査変換処理を行う。On the other hand, the analog carrier color signal C extracted and separated by the Y/C separation circuit 3 is converted into a digital carrier color signal by the A/D conversion circuit 5b, and then supplied to the sequential scan conversion circuit 6a. The progressive scan conversion circuit 6b doubles the in-field line density of the carrier color signal (line frequency 31 .5
K11z) is performed.
順次走査変換処理済みのディジタル搬送色信号は、D/
A変換回路7bにおいて対応のアナログ搬送色信号に変
換され、色副搬送波周波数に等しい中心周波数を持つ帯
域通過濾波回路9を経て色復調回路10に供給される。The digitally transported color signal, which has undergone progressive scan conversion, is
It is converted into a corresponding analog carrier chrominance signal in the A conversion circuit 7b, and is supplied to the chrominance demodulation circuit 10 via a bandpass filter circuit 9 having a center frequency equal to the chrominance subcarrier frequency.
色復調回路10は、順次走査変換処理済みのアナログ搬
送色信号から三原色の色差信号(R−Y)、 (G−
Y)、 (B−y)に復調し、それぞれを加算回路群
11a〜11cの色差信号入力端子に供給する。The color demodulation circuit 10 generates color difference signals of three primary colors (R-Y), (G-
Y) and (B-y), and supply each to the color difference signal input terminals of the adder circuit groups 11a to 11c.
加算回路11aで代表して示す構成の加算回路群112
〜IICは、色復調回路10から出力さく7)
れた順次走査変換処理済み色差信号と、低域通過濾波回
路8から出力される順次走査変換処理済み輝度信号とを
加算することにより順次走査変換処理済みの三原色信号
R,G、Bを作成し、それぞれを出力端子12a〜12
cに出力する。Adder circuit group 112 whose configuration is represented by adder circuit 11a
~IIC performs progressive scan conversion by adding the progressive scan converted color difference signal output from the color demodulation circuit 10 (7) and the progressive scan converted luminance signal output from the low-pass filter circuit 8. Create processed three primary color signals R, G, and B, and send them to output terminals 12a to 12.
Output to c.
発明の効果
以上詳細に説明したように、本発明の順次走査変換装置
は、アナログ映像信号を輝度信号と搬送色信号とにY/
C分離し、それぞれをディジタル信号に変換して順次走
査変換処理を施したのち対応のアナログ信号に戻し、こ
の順次走査変換処理済みのアナログ搬送色信号から3種
の色差信号を復調し、これら色差信号のそれぞれと順次
走査変換処理済みの輝度信号から対応のアナログ三原色
信号を作成する構成であるから、従来装置に比べてディ
ジタル処理系統を1系統削減でき、装置の低廉化が可能
となる。Effects of the Invention As explained in detail above, the progressive scan conversion device of the present invention converts an analog video signal into a luminance signal and a carrier color signal in Y/
After converting each into a digital signal and performing sequential scan conversion processing, it is returned to the corresponding analog signal, and three types of color difference signals are demodulated from this analog carrier color signal that has undergone sequential scan conversion processing, and these color difference signals are Since the configuration is such that the corresponding analog three primary color signals are created from each signal and the luminance signal that has undergone sequential scan conversion processing, the number of digital processing systems can be reduced by one compared to conventional devices, making it possible to reduce the cost of the device.
第1図は本発明の一実施例の順次走査変換装置の構、成
を示すブロック図、第2図は従来の順次走査変換装置の
構成を示すブロック図である。
1・・入力端子、2・・水平AFC回路、3・・Y/C
分離回路、5a、5b・・A/D変換回路、5a、5b
・・順次走査変換回路、7a、7b・・D/A変換回路
、10・・色復調回路、11a〜IIC・・加算回路。
特許出願人 日本電気ホームエレクトロニクス株式会社FIG. 1 is a block diagram showing the structure of a progressive scan converter according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the structure of a conventional progressive scan converter. 1...Input terminal, 2...Horizontal AFC circuit, 3...Y/C
Separation circuit, 5a, 5b...A/D conversion circuit, 5a, 5b
. . . Progressive scanning conversion circuit, 7a, 7b . . . D/A conversion circuit, 10 . . . Color demodulation circuit, 11a to IIC . . . Addition circuit. Patent applicant: NEC Home Electronics Co., Ltd.
Claims (1)
信号を輝度信号と搬送色信号とにY/C分離し、それぞ
れをディジタル信号に変換して順次走査変換処理を施し
たのち対応のアナログ信号に戻し、この順次走査変換処
理済みのアナログ搬送色信号から3種の色差信号を復調
し、これら色差信号のそれぞれと順次走査変換処理済み
のアナログ輝度信号から対応のアナログ三原色信号を作
成することを特徴とするカラーテレビジョン信号の順次
走査変換装置。The analog color television signal passed through the horizontal AFC circuit is Y/C separated into a luminance signal and a carrier color signal, each is converted into a digital signal, sequentially subjected to scan conversion processing, and then returned to the corresponding analog signal. The present invention is characterized in that three types of color difference signals are demodulated from the analog carrier color signal that has been subjected to the progressive scan conversion process, and corresponding analog three primary color signals are created from each of these color difference signals and the analog luminance signal that has been subjected to the progressive scan conversion process. A progressive scan conversion device for color television signals.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11672686A JPS62272794A (en) | 1986-05-21 | 1986-05-21 | Sequential scanning converter for color television signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11672686A JPS62272794A (en) | 1986-05-21 | 1986-05-21 | Sequential scanning converter for color television signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62272794A true JPS62272794A (en) | 1987-11-26 |
Family
ID=14694277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11672686A Pending JPS62272794A (en) | 1986-05-21 | 1986-05-21 | Sequential scanning converter for color television signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62272794A (en) |
-
1986
- 1986-05-21 JP JP11672686A patent/JPS62272794A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR100388579B1 (en) | Luma/chroma separation filter with common delay element | |
JPH0262079B2 (en) | ||
EP1355501A1 (en) | Y/c separating and y/c separating method | |
US4949166A (en) | Apparatus for combining and separating constituent components of a video signal | |
US4786963A (en) | Adaptive Y/C separation apparatus for TV signals | |
US3871019A (en) | Line sequential color television recording system | |
US7515211B2 (en) | Video signal processing circuit, video signal display apparatus, and video signal recording apparatus | |
US4333104A (en) | Color demodulating apparatus with cross-color cancellation | |
EP0218241A2 (en) | Bi-dimensional comb filter | |
JPS62272794A (en) | Sequential scanning converter for color television signal | |
US3946431A (en) | Synchronized demodulation of the chrominance signal with switched carrier phase angles | |
EP0364967A2 (en) | Luminance/chrominance signal separation circuit for pal color television signal | |
US3889288A (en) | Symmetrically encoded line sequential color signals | |
KR0158665B1 (en) | Extended composite tv system | |
JP2566026B2 (en) | Television signal transmission system | |
JP2569735B2 (en) | Standard method conversion method | |
JP2531644B2 (en) | Scan line number converter | |
JPS62272793A (en) | Sequential scanning converter for color television signal | |
JP2607537B2 (en) | Television signal processing circuit | |
JP3075040B2 (en) | Color signal processing device | |
JPS6264188A (en) | Television signal generating device | |
JPH03135293A (en) | Video signal processor | |
JPS6057794A (en) | Scanning converter | |
JPS60246195A (en) | Recording and reproducing system of line sequential video signal | |
EP0418569A2 (en) | Image signal reproducing apparatus |