JPS6390991A - Scanning line number converting device - Google Patents

Scanning line number converting device

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Publication number
JPS6390991A
JPS6390991A JP23617186A JP23617186A JPS6390991A JP S6390991 A JPS6390991 A JP S6390991A JP 23617186 A JP23617186 A JP 23617186A JP 23617186 A JP23617186 A JP 23617186A JP S6390991 A JPS6390991 A JP S6390991A
Authority
JP
Japan
Prior art keywords
signal
scanning line
line number
circuit
number conversion
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.)
Granted
Application number
JP23617186A
Other languages
Japanese (ja)
Other versions
JP2531644B2 (en
Inventor
Reiichi Kobayashi
玲一 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP61236171A priority Critical patent/JP2531644B2/en
Publication of JPS6390991A publication Critical patent/JPS6390991A/en
Application granted granted Critical
Publication of JP2531644B2 publication Critical patent/JP2531644B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To miniaturize a circuit as whole by making a clock in a digital signal processing into a 910 FH or 1820 FH clock. CONSTITUTION:A scanning line converting part 32 is composed of a scanning line interpolating circuit 321 and a scanning line number converting circuit 322 and the line signal is interpolated by the processing in a time base. An interplated line signal a2 is generated by adding the output of an 1H delay device 321a and a present line signal a1 with an adder 321b and outputted by multiply ing a coefficient 1/2. At a scanning line number converting circuit 322, signals a1 and a2 are successively changed over at every 1/2 H time, outputted by the clock of 1820 FH, the successive scanning to convert a scanning line number, and concerning the multiplexed C signal, a scanning line number conversion is also executed. A color separating circuit 35 inverts and outputs alternately a signal beta to add a signal delayed by two delay devices 351 and 352 and a present signal with an adder (outputted by 1/2 times) 353 and the output signal alphaof the delay, device 351 with a switching device 354. Thus, a C1' signal and a C2' signal are separated.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、NTSCコンポジット信号の走査線数変換に
関する。特にVTRの入力信号にも有効なシステムに関
する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to scanning line number conversion of an NTSC composite signal. In particular, the present invention relates to a system that is also effective for VTR input signals.

〔従来の技術〕[Conventional technology]

現行のインタレース走査では、インター ラインフリッ
カ、ラインクローリングなどのインクレース妨害があり
、画質劣化の原因になっているので、インブルーブトテ
レビ(IDTV)では信号処理として、走査線補間によ
り順次走査に変換して表示する。従来のVTRのように
NTSC信号に準拠していない信号での走査線数変換方
式では、コンポジット信号をアナログ手段でR,G、B
信号に変換し、水平周期に周波数ロックしたクロソクで
各信号をA/D変換し、倍のレートで1水平走査線のデ
ータを2回出力することで、走査線数を倍にして順次走
査となし、D/A変換するようにしている。
Current interlaced scanning has interlaced disturbances such as interline flicker and line crawling, which cause deterioration in image quality. Therefore, in-blue video television (IDTV) uses scanning line interpolation to perform sequential scanning as signal processing. Convert and display. In the scanning line number conversion method for signals that do not conform to NTSC signals, such as in conventional VTRs, composite signals are converted to R, G, and B using analog means.
By converting each signal into a signal, A/D converting each signal using a crosslock whose frequency is locked to the horizontal period, and outputting the data of one horizontal scanning line twice at twice the rate, the number of scanning lines can be doubled and sequential scanning can be performed. None, D/A conversion is performed.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上述の方式では、コンポジット信号をアナログ手段で、
R,G、B信号に変換するので、温度変化・経時変化な
どで特性が変化することが多かった。また、R,G、B
信号の各々についてA/D変換し、信号処理を行なうの
で、3系統の回路が必要であり、その分コスト高の方式
になる。
In the above-mentioned method, the composite signal is processed by analog means.
Since it converts into R, G, and B signals, its characteristics often change due to temperature changes, changes over time, etc. Also, R, G, B
Since each signal is A/D converted and signal processed, three systems of circuits are required, resulting in a correspondingly higher cost method.

さらに、コンポジットビデオ信号を4Fscでサンプリ
ングしY/C分離を行なうシステムでは、VTRからの
信号のように、カラーバーストと水平同期信号とが同期
していないコンポジット信号の場合には、lラインのサ
ンプル数が厳密に4×(445/2) =910になら
ず、正しい走査線補間ができない。
Furthermore, in a system that samples a composite video signal at 4Fsc and performs Y/C separation, in the case of a composite signal in which the color burst and horizontal synchronization signal are not synchronized, such as a signal from a VTR, the l-line sample is The number is not exactly 4×(445/2)=910, and correct scanning line interpolation cannot be performed.

〔問題点を解決するための手段〕[Means for solving problems]

上記問題点を解決するために、本発明は入力されたNT
SCコンポジフト信号の水平同期信号に同期して発生さ
せた9 10 F)l (FH:水平走査周波数)の周
波数のクロックにより、先ずコンポジット信号をA/D
変換し、Y信号および色信号を復調する。色信号として
は2系統のC1信号。
In order to solve the above problems, the present invention provides input NT
First, the composite signal is converted to A/D using a clock having a frequency of 9 10 F)l (FH: horizontal scanning frequency) generated in synchronization with the horizontal synchronization signal of the SC composite signal.
The Y signal and color signal are demodulated. There are two C1 signals as color signals.

C2信号である。ここでC1信号はR−Yまたは■信号
、C2信号はB−YまたはC信号とする。
This is the C2 signal. Here, the C1 signal is an R-Y or ■ signal, and the C2 signal is a B-Y or C signal.

このディジタル色復調装置は、本発明者が特願昭61−
1’+’J3(’13号において提示したものである。
This digital color demodulation device was developed by the inventor in Japanese Patent Application No.
1'+'J3 (presented in '13).

前記のY信号、C1信号、C2信号の走査線数変換は、
3系統として行なわず、Y信号とCI倍信号C2信号を
時間軸で多重したC信号との2系統として行なう。
The scanning line number conversion of the Y signal, C1 signal, and C2 signal is as follows:
Instead of three systems, two systems, the Y signal and the C signal obtained by multiplexing the CI multiplied signal C2 signal on the time axis, are used.

Y信号は遅延補償回路を経て、C1信号・C2信号は時
間軸多重回路で多重したC信号として、それぞれ各別に
、水平走査線間の補間値を演算し、水平走査線データと
補間値データとを倍のレートで交互に出力する走査線数
変換部に入力し、走査線数変換Y′信号と、G′信号と
を作成する。G′信号は再び色分離回路により分離しC
1′信号・C2’信号とに分離する。前記Y′信号およ
び01′信号・C2’信号をマトリクス回路で原色に復
し、D/A変換することで走査線数の変換されたR’、
C’、B’倍信号得る。
The Y signal passes through a delay compensation circuit, and the C1 signal and C2 signal are multiplexed in a time axis multiplexing circuit as a C signal. Interpolated values between horizontal scanning lines are calculated for each separately, and horizontal scanning line data and interpolated value data are calculated. is input to a scanning line number conversion section which alternately outputs the signal at double rate to create a scanning line number converted Y' signal and a G' signal. The G' signal is again separated by the color separation circuit and C
The signal is separated into a 1' signal and a C2' signal. The Y' signal, the 01' signal, and the C2' signal are restored to the primary colors by a matrix circuit, and R' with the number of scanning lines converted by D/A conversion.
Obtain C' and B' times signals.

上記ディジタル信号処理におけるクロックは、すべてデ
ィジタル色復調装置に用いた入力NTSCコンポジット
信号の水平同期信号に同期して発生させた910FHま
たは1820F□クロツクである。
The clocks used in the digital signal processing described above are all 910FH or 1820F□ clocks generated in synchronization with the horizontal synchronization signal of the input NTSC composite signal used in the digital color demodulator.

〔実施例〕〔Example〕

以下、図面を参照して、本発明の一実施例につき説明す
る。第1図は回路ブロック図である。入力のNTSC信
号は、ディジタル色復調装置30に入力し、Y信号およ
びCI、C2信号を復調する。Y信号は遅延補償回路3
1を経て、走査線数変換部32に入力し、走査線数変換
Y′信号はマトリクス回路36に入力する。C1,C2
信号は、時間軸多重回路33で多重化し、その多重化さ
れたC信号として走査線数変換部34に入力し、走査線
数変換G′信号が再び色分離回路35で、C1’、C2
’信号に分離され、マトリクス回路36に入力する。マ
トリクス回路36は入力されたY′信号、01′信号、
02′信号から原色に復原した後D/A変換器37,3
8.39でアナログ信号に変換し、R′信号、G′信号
、B′信号として出力される。
Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit block diagram. The input NTSC signal is input to a digital color demodulator 30, and the Y signal, CI, and C2 signals are demodulated. Y signal is delay compensation circuit 3
1, the Y' signal is input to the scanning line number converter 32, and the scanning line number converted Y' signal is input to the matrix circuit 36. C1, C2
The signals are multiplexed in a time axis multiplexing circuit 33 and inputted as the multiplexed C signal to a scanning line number converter 34, and the scanning line number converted G' signal is again sent to a color separation circuit 35, where it is converted into C1', C2.
'The signal is separated into signals and input to the matrix circuit 36. The matrix circuit 36 receives the input Y' signal, 01' signal,
After restoring the primary colors from the 02' signal, the D/A converters 37, 3
8.39, it is converted into an analog signal and output as an R' signal, a G' signal, and a B' signal.

次に各部について説明する。ディジタル色復調装置は、
第2図の回路ブロック図に示す。この装置の詳細は特願
昭61− rc/C1393号に記載されているので動
作の概略について述べる。PLL回路2は人力NTSC
コンポジット信号のカラーバーストに同期したアナログ
色副搬送波2aを発生する。一方タイミング発生回路4
はHD、VDの他各種信号を発生し、PLL回路3は、
信号103として水平同期信号に同期した信号を入力し
、910 FHのクロックを発生する。したがってこの
クロックは水平同期信号に同期し、図にみるように各部
のクロック104として用いられる。さてPLL回路2
の出力であるアナログ色副搬送波2aは、A/D変換器
6で前記クロック104でディジタル化されるので、デ
ィジタル色副搬送波6aは、常にライン上の確定した位
置にサンプル点をもつ。一方A/D変換器1のクロック
も同一のクロック104であるから、Y/C分離回路5
の出力C信号もディジタル色副搬送波6aと同期関係に
あり、直交復調部20によって、C1信号。
Next, each part will be explained. Digital color demodulator is
This is shown in the circuit block diagram of FIG. The details of this device are described in Japanese Patent Application No. 61-rc/C1393, so an outline of its operation will be described below. PLL circuit 2 is human powered NTSC
An analog color subcarrier 2a synchronized with the color burst of the composite signal is generated. On the other hand, timing generation circuit 4
generates HD, VD and other various signals, and the PLL circuit 3
A signal synchronized with the horizontal synchronization signal is input as the signal 103, and a clock of 910FH is generated. Therefore, this clock is synchronized with the horizontal synchronizing signal and is used as the clock 104 of each part as shown in the figure. Now, PLL circuit 2
Since the analog color subcarrier 2a, which is the output of the digital color subcarrier 2a, is digitized by the A/D converter 6 using the clock 104, the digital color subcarrier 6a always has a sample point at a fixed position on the line. On the other hand, since the clock of the A/D converter 1 is also the same clock 104, the Y/C separation circuit 5
The output C signal is also in a synchronous relationship with the digital color subcarrier 6a, and is converted into a C1 signal by the orthogonal demodulator 20.

C2信号を正しく復調できる。The C2 signal can be demodulated correctly.

次に、第1図において、復調されたY信号、C信号の走
査線数を変換する走査線数変換部32゜34について説
明する。両者は同一構成である。
Next, referring to FIG. 1, the scanning line number conversion units 32 and 34 that convert the number of scanning lines of the demodulated Y signal and C signal will be explained. Both have the same configuration.

走査線数変換部32は、走査線補間回路321゜走査線
数変換回路322からなり、時間軸内処理により補間す
る。ただし補間は他の方法、たとえばフィールド間処理
による補間でもよい。走査線補間回路321の出力のう
ち信号a1が現ライン信号、信号a2が補間されたライ
ン信号である。
The scanning line number conversion unit 32 includes a scanning line interpolation circuit 321 and a scanning line number conversion circuit 322, and performs interpolation by processing within the time axis. However, the interpolation may be performed using other methods, such as interpolation using inter-field processing. Among the outputs of the scanning line interpolation circuit 321, the signal a1 is the current line signal, and the signal a2 is the interpolated line signal.

信号a2はIH遅延器321aの出力と現ライン信号と
を加算器321bで加算して作成される。
Signal a2 is created by adding the output of IH delay device 321a and the current line signal by adder 321b.

加算器321bは係数2を乗じて出力する。上記信号a
、、a2が走査線数変換回路322に入力し、同回路が
%H待時間とに信号a、、azを順に切替えて1820
F、のクロックで出力することで走査線数を変換した順
次走査とする。多重化されたC信号についても同様に走
査線数変換がなされる。
The adder 321b multiplies the result by a coefficient of 2 and outputs the result. The above signal a
,,a2 are input to the scanning line number conversion circuit 322, and the circuit sequentially switches the signals a, , az according to the %H waiting time and converts the signals 1820 to 1820.
Sequential scanning is performed by converting the number of scanning lines by outputting with the clock F. The number of scanning lines is similarly converted for the multiplexed C signal.

次に走査線数変換C′倍信号ら、01′信号。Next, the scanning line number conversion C' multiplied signal and the 01' signal.

C2’信号に分離する色分離回路35について説明する
。この回路は2つの遅延器351,352で遅延した信
号と現信号とを加算器(IA倍にして出力する)353
で加算した信号βと遅延器351の出力信号αとを切替
器354で交互に反転して出力する。これによってC1
′信号とC2’信号とが分離される。この動作は第3図
に示すタイムチャートで理解できる。
The color separation circuit 35 that separates the C2' signal will be explained. This circuit converts the signal delayed by two delay devices 351 and 352 and the current signal to an adder 353 (which multiplies the signal by IA and outputs it).
The signal β added in step 1 and the output signal α of the delay device 351 are alternately inverted by a switch 354 and outputted. This allows C1
' signal and C2' signal are separated. This operation can be understood from the time chart shown in FIG.

〔発明の効果〕〔Effect of the invention〕

以上、詳しく説明したように、本発明は特願昭61−1
’1C13’i”3 号において提示したディジタル色
復調装置により、NTSCコンボジント信号をY信号お
よびC1信号・C2信号に復調した後、走査線数の変換
を行なってから、マトリクス回路によりR,G、B信号
として出力する変換装置である。C1,C2信号の走査
線数変換は、CI。
As explained in detail above, the present invention was filed in Japanese Patent Application No. 61-1
After demodulating the NTSC composite signal into a Y signal, C1 signal, and C2 signal using the digital color demodulation device presented in '1C13'i''3, the number of scanning lines is converted, and then R, G, This is a conversion device that outputs as a B signal.The conversion of the number of scanning lines of C1 and C2 signals is performed by CI.

C2信号を時間軸上で多重化したC信号について行ない
、その後でC1′信号、02′信号に分離する。このた
めに必要となる時間軸多重回路、色分離回路は、きわめ
て簡単なスイッチング回路。
The C2 signal is applied to the C signal multiplexed on the time axis, and then separated into the C1' signal and the 02' signal. The time axis multiplexing circuit and color separation circuit required for this purpose are extremely simple switching circuits.

遅延器、加算器で構成できる。したがって、大規模な回
路になる走査線補間回路、走査線数変換回路から構成さ
れる走査線数変換部が、Y信号とC1、C2信号とに対
して2個設けるだけでよいので全体として回路規模が小
さくできる。
It can be configured with a delay device and an adder. Therefore, the scanning line number converter, which is a large-scale circuit consisting of a scanning line interpolation circuit and a scanning line number converting circuit, only needs to be provided for two signals, one for the Y signal and one for the C1 and C2 signals. Can be made smaller.

また、ディジタル色復調装置により復調されたY信号、
C1信号、C2信号は、水平同期信号に同期して出力さ
れるので、VTRの信号の場合(カラーバーストと水平
同期信号とが同期していない)にも、後段のディジタル
信号処理、たとえば走査線数変換補間が有効に行ないう
る。
In addition, the Y signal demodulated by the digital color demodulator,
The C1 and C2 signals are output in synchronization with the horizontal synchronization signal, so even in the case of VTR signals (color burst and horizontal synchronization signal are not synchronized), digital signal processing in the subsequent stage, such as scanning line Number conversion interpolation can be performed effectively.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の回路ブロック図、第2図は
ディジタル色復調装置の回路ブロック図、第3図は色分
離回路の動作説明のためのタイムチャートである。 30・−ディジタル色復調装置、 31−遅延補償回路、 32.34−走査線数変換部、 321−走査線補間回路、 322−・走査線数変換回路、 33−・−時間軸多重回路、 35・−色分離回路、3
5−マトリクス回路、 37〜39−・・D/A変換器。
FIG. 1 is a circuit block diagram of an embodiment of the present invention, FIG. 2 is a circuit block diagram of a digital color demodulator, and FIG. 3 is a time chart for explaining the operation of the color separation circuit. 30--Digital color demodulation device, 31--Delay compensation circuit, 32. 34--Scanning line number converter, 321--Scanning line interpolation circuit, 322--Scanning line number converter circuit, 33--Time axis multiplexing circuit, 35・-Color separation circuit, 3
5-matrix circuit, 37-39-...D/A converter.

Claims (1)

【特許請求の範囲】 NTSCコンポジット信号を、ディジタル色復調装置に
入力し、Y信号・C1信号・C2信号として分離出力し
、 Y信号は遅延補償回路を経て、C1信号・C2信号は時
間軸多重回路で多重したC信号として、それぞれ各別に
、水平走査線間の補間値を演算し、水平走査線データと
補間値データとを倍のレートで交互に出力する走査線数
変換部に入力し、前記走査線数変換部の出力である走査
線数変換Y′信号と、走査線数変換C′信号を色分離回
路により分離したC1′信号・C2′信号とをマトリク
ス回路に入力し、 前記マトリクス回路の出力をそれぞれD/A変換して走
査線数変換R′、G′、B′信号として出力する走査線
数変換装置であって、 前記ディジタル色復調装置および各種ディジタル処理部
のクロックが入力されたNTSCコンポジット信号の水
平同期信号に同期して発生させた910F_Hまたは1
820F_H(F_H:水平走査周波数)の周波数の信
号であることを特徴とする走査線数変換装置。
[Claims] The NTSC composite signal is input to a digital color demodulation device and separated and output as a Y signal, C1 signal, and C2 signal. The Y signal passes through a delay compensation circuit, and the C1 signal and C2 signal are time-domain multiplexed. As a C signal multiplexed in a circuit, interpolated values between horizontal scanning lines are calculated for each separately, and inputted to a scanning line number converter that alternately outputs horizontal scanning line data and interpolated value data at double rate, Inputting the scanning line number conversion Y' signal, which is the output of the scanning line number conversion section, and the C1' signal and C2' signal, which are obtained by separating the scanning line number conversion C' signal by a color separation circuit, into a matrix circuit; A scanning line number conversion device that converts the outputs of the circuits into digital analog signals and outputs them as scanning line number conversion signals R', G', and B', the clocks of the digital color demodulation device and various digital processing units being inputted. 910F_H or 1 generated in synchronization with the horizontal synchronization signal of the NTSC composite signal
A scanning line number conversion device characterized in that the signal has a frequency of 820F_H (F_H: horizontal scanning frequency).
JP61236171A 1986-10-06 1986-10-06 Scan line number converter Expired - Lifetime JP2531644B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61236171A JP2531644B2 (en) 1986-10-06 1986-10-06 Scan line number converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61236171A JP2531644B2 (en) 1986-10-06 1986-10-06 Scan line number converter

Publications (2)

Publication Number Publication Date
JPS6390991A true JPS6390991A (en) 1988-04-21
JP2531644B2 JP2531644B2 (en) 1996-09-04

Family

ID=16996823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61236171A Expired - Lifetime JP2531644B2 (en) 1986-10-06 1986-10-06 Scan line number converter

Country Status (1)

Country Link
JP (1) JP2531644B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6057794A (en) * 1983-09-08 1985-04-03 Nec Corp Scanning converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6057794A (en) * 1983-09-08 1985-04-03 Nec Corp Scanning converter

Also Published As

Publication number Publication date
JP2531644B2 (en) 1996-09-04

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