JPH0446506B2 - - Google Patents
Info
- Publication number
- JPH0446506B2 JPH0446506B2 JP58211320A JP21132083A JPH0446506B2 JP H0446506 B2 JPH0446506 B2 JP H0446506B2 JP 58211320 A JP58211320 A JP 58211320A JP 21132083 A JP21132083 A JP 21132083A JP H0446506 B2 JPH0446506 B2 JP H0446506B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- color difference
- color
- difference signal
- frequency
- 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.)
- Expired - Lifetime
Links
- 238000005070 sampling Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000003111 delayed effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電子スチルカメラあるいはテレビジヨ
ンのPAL方式などのように色信号として２種類
の色差信号を線順次化している方式での受信ある
いは再生装置での色差信号の識別装置に関するも
のである。[Detailed Description of the Invention] Industrial Application Field The present invention is applicable to a receiving or reproducing device using a system in which two types of color difference signals are line-sequentially used as color signals, such as the PAL system of electronic still cameras or televisions. The present invention relates to a color difference signal identification device.
従来例の構成とその問題点
電子スチルカメラの構成の１例を第１図に示
す。被写体１の像がレンズ２を通し撮像素子３上
に結像する。撮像素子３は水平、垂直偏向を始め
所定のパルス発生と駆動回路をもつ駆動部８で駆
動され、電気信号となる。電気信号は信号処理部
４で輝度信号Ｙ５、第１の色差信号（Ｒ−Ｙ）
６、第２の色差信号（Ｂ−Ｙ）７に分離される。
色差信号６，７はカメラの水平同期信号９と同期
して１水平走査期間ごとにスイツチングする順次
化回路１０によつて、水平走査毎に交互に時分割
多重している。この色差信号をFM変調部１１で
FM変調するが、再生側で色差信号の種類が識別
しうるために色差信号の種類によりFMの搬送波
周波数を違えてある。第２図にFM波のスペクト
ルを示すが、たとえば第１の色差信号Ｒ−Ｙの搬
送波周波数は1.2MHz、第２の色差信号Ｂ−Ｙの
それは1.3MHzである。一方輝度信号Ｙを、FM変
調部１２でFM変調する。記録増幅器１３で輝度
信号と色信号のFM波を混合し、増幅し、ヘツド
１４に電流を流し、磁気デイスク１５に記録す
る。ちなみに記録電流のスペクトルは第２図で、
輝度信号５が広く高域側に、色信号は低域側に配
置してある。横軸は周波数、縦軸は振幅を示す。Conventional configuration and its problems An example of the configuration of an electronic still camera is shown in FIG. An image of a subject 1 is formed on an image sensor 3 through a lens 2. The image sensor 3 is driven by a drive section 8 having a drive circuit for generating and driving prescribed pulses, including horizontal and vertical deflection, and generates an electric signal. The electrical signals are processed by the signal processing unit 4 into a luminance signal Y5 and a first color difference signal (R-Y).
6 and a second color difference signal (B-Y) 7.
The color difference signals 6 and 7 are time-division multiplexed alternately for each horizontal scan by a sequential circuit 10 that switches each horizontal scan period in synchronization with a horizontal synchronization signal 9 of the camera. This color difference signal is sent to the FM modulator 11.
Although it is FM modulated, the FM carrier frequency is different depending on the type of color difference signal so that the type of color difference signal can be identified on the playback side. FIG. 2 shows the spectrum of the FM wave. For example, the carrier frequency of the first color difference signal RY is 1.2 MHz, and that of the second color difference signal B-Y is 1.3 MHz. On the other hand, the luminance signal Y is subjected to FM modulation by the FM modulation section 12. The recording amplifier 13 mixes and amplifies the FM waves of the luminance signal and the color signal, causes a current to flow through the head 14, and records on the magnetic disk 15. By the way, the spectrum of the recording current is shown in Figure 2.
The luminance signal 5 is widely placed on the high frequency side, and the color signal is placed on the low frequency side. The horizontal axis shows frequency and the vertical axis shows amplitude.
次に第３図で再生側の説明をする。ヘツド１６
でピツクアツプした磁気デイスク１５の信号をヘ
ツドアツプ１７で増幅し、輝度信号成分はハイパ
スフイルタHPF１８で、色信号成分はローパス
フイルタLPF２３で分離し、それぞれをリミツ
タ１９，２４とFM復調器２０，２５にてFM復
調し、ベースバンド信号を得る。この色差信号と
これを１水平走査期間遅延する1H遅延装置２８
で1H遅延した色差信号を、Ｒ−Ｙ信号はスイツ
チ２９で、Ｂ−Ｙ信号はスイツチ３０でａ端子、
ｂ端子を1H毎に交互に切りかえることにより２
つの色差信号を同時化することができる。すなわ
ち第４図で再生した色差信号をｄとすると、これ
を1H遅延した色差信号がｅとなる。そしてＲ−
Ｙ信号としてイ，ホ，ハ……、Ｂ−Ｙ信号として
ニ，ロ，ヘ……という具合に再生信号ｄと遅延信
号ｅを第３図のスイツチ２９，３０で選択するこ
とにより連続した２種類の色差信号Ｒ−ＹとＢ−
Ｙとが得られる。スイツチ２９，３０は制御信号
発生器３５の制御信号でコントロールする。制御
信号発生器３５からは、色信号用の増幅器２６の
出力がＲ−Ｙの時は、スイツチ２９はａ端子に、
スイツチ３０はｂ端子に、出力がＢ−Ｙの時はス
イツチ２９はｂ端子に、スイツチ３０はａ端子と
なるべく制御信号が出力される。増幅器２６から
の出力が、Ｒ−ＹであるかＢ−Ｙであるかの識別
は、色信号用のリミツタ２４の出力のブランキン
グ部のみをゲート３２で取り出し、これをＲ−Ｙ
のFM搬送周波数である1.2MHzの同調回路３３を
通し、その出力を検波し、波形整形することによ
り、Ｒ−Ｙのブランキング部の位置にＲ−Ｙの検
出信号が、検波整形回路３４から得られる。輝度
信号から同期分離部２７で得られる水平同期信号
を制御信号発生器３５のフリツプフロツプのクロ
ツクとすることにより１水平走査期間毎に反転す
る出力が得られるが、これを前述のＲ−Ｙ検出信
号でイニシアライズすることにより前述のスイツ
チ２９，３０の制御信号が得られる。以上のよう
にして得られたＲ−ＹとＢ−Ｙをカラーエンコー
ダ３１でカラーサブキヤリア周波数を直角２相変
調することによりNTSC方式の色信号が得られ、
これと輝度信号を混合器２２で加え合せ増幅し、
ビデオ信号として出力端子３６から出力する。 Next, the reproduction side will be explained with reference to FIG. Head 16
The signal from the magnetic disk 15 picked up is amplified by the head up 17, the luminance signal component is separated by a high-pass filter HPF 18, and the chrominance signal component is separated by a low-pass filter LPF 23, and each is sent to limiters 19, 24 and FM demodulators 20, 25. Demodulate FM and obtain baseband signal. This color difference signal and a 1H delay device 28 that delays this by one horizontal scanning period
The color difference signal delayed by 1H is sent to the switch 29 for the R-Y signal, and the switch 30 for the B-Y signal to the a terminal.
2 by switching the b terminal alternately every 1H.
It is possible to simultaneously synchronize two color difference signals. That is, if the color difference signal reproduced in FIG. 4 is d, the color difference signal delayed by 1H is e. And R-
By selecting the reproduced signal d and the delayed signal e with the switches 29 and 30 in FIG. 3, two consecutive Types of color difference signals RY and B-
Y is obtained. Switches 29 and 30 are controlled by control signals from a control signal generator 35. From the control signal generator 35, when the output of the color signal amplifier 26 is R-Y, the switch 29 is connected to the a terminal.
A control signal is outputted to the switch 30 to the b terminal, and when the output is BY, the switch 29 to the b terminal, and the switch 30 to the a terminal. To identify whether the output from the amplifier 26 is R-Y or B-Y, only the blanking part of the output of the color signal limiter 24 is taken out by the gate 32, and this is converted into R-Y.
By detecting the output through the tuning circuit 33 of 1.2MHz, which is the FM carrier frequency of can get. By using the horizontal synchronization signal obtained from the luminance signal by the synchronization separator 27 as the flip-flop clock of the control signal generator 35, an output that is inverted every horizontal scanning period can be obtained. By initializing with , the control signals for the switches 29 and 30 described above are obtained. By performing quadrature two-phase modulation on the color subcarrier frequency of R-Y and B-Y obtained in the above manner using the color encoder 31, an NTSC color signal is obtained.
This and the luminance signal are added together and amplified by the mixer 22,
It is output from the output terminal 36 as a video signal.
ここで色識別のために1.2MHzの同調回路３３
でＲ−ＹのFM搬送波を抽出するが、このために
は記録側におけるFM搬送波の発振周波数の安定
性および再生側における同調回路の同調周波数の
安定性が重要となる。 Here, a 1.2MHz tuning circuit 33 is used for color discrimination.
The R-Y FM carrier wave is extracted, but for this purpose, the stability of the oscillation frequency of the FM carrier wave on the recording side and the stability of the tuning frequency of the tuning circuit on the reproduction side are important.
発明の目的
本発明は、FMの搬送波周波数が若干ずれても
安定に色差信号の識別が出来るよう構成したもの
である。OBJECTS OF THE INVENTION The present invention is configured so that color difference signals can be stably identified even if the FM carrier frequency is slightly shifted.
発明の構成
本発明は、記録側における発振周波数の精度を
向上させることは難かしいが、Ｒ−ＹとＢ−Ｙの
搬送周波数の差を所定の範囲におさえることは比
較的容易であり、再生側の方式次第で、この範囲
を広くすることも可能であり、この点から２種類
の色差信号のFM搬送波周波数の差に着目し、色
差信号の識別をした方が、識別の精度をあげかつ
FM搬送波の周波数ズレ量の許容値を大きくせん
とするものである。Structure of the Invention According to the present invention, although it is difficult to improve the accuracy of the oscillation frequency on the recording side, it is relatively easy to suppress the difference between the carrier frequencies of R-Y and B-Y within a predetermined range. It is possible to widen this range depending on the side system, and from this point of view, it is better to focus on the difference in FM carrier frequency between the two types of color difference signals and identify the color difference signals, which will improve the accuracy of identification and increase the accuracy of the discrimination.
This is intended to increase the allowable value of the amount of frequency deviation of FM carrier waves.
すなわち、本発明はFM復調では搬送波周波数
とFM検波出力が比例することから、FM復調し
た再生色差信号のブランキング部の電圧レベルに
より色差信号を識別するものである。この点から
２種類の色差信号のFM搬送波周波数の差に着目
し、色差信号の識別をした方が、識別の精度をあ
げかつFM搬送波の周波数ズレ量の許容値を大き
くすることができる。本発明はFM復調では搬送
波周波数とFM検波出力が比例することから、
FM検波出力が比例することから、FM復調した
再生色差信号のブランキング部の電圧レベルによ
り色差信号を識別するものである。 That is, in the present invention, since the carrier frequency and the FM detection output are proportional in FM demodulation, the color difference signal is identified by the voltage level of the blanking part of the FM demodulated reproduced color difference signal. From this point of view, by focusing on the difference in FM carrier frequency between two types of color difference signals and identifying the color difference signals, it is possible to improve the accuracy of identification and increase the allowable value of the amount of frequency deviation of the FM carrier. In the present invention, since carrier frequency and FM detection output are proportional in FM demodulation,
Since the FM detection output is proportional, the color difference signal is identified by the voltage level of the blanking part of the FM demodulated reproduced color difference signal.
実施例の説明
実施例を第５図、第６図で説明する。FM復調
し増幅器２６で増幅した線順次化された色信号は
第６図ｂのように１水平走査期間毎にＲ−ＹとＢ
−Ｙが多重化され、そのブランキング部は電圧値
が、V2ボルト、V1ボルトとV1−V2＝ΔVの違い
がある。これは前述のとうりFMの搬送波周波数
の違いによるものである。この色信号のブランキ
ング部分をサンプルホールド部３７でサンプルホ
ールドする。実施例ではサンプリングパルスは、
第６図ａの輝度信号Ｙから同期分離部２７で抽出
した水平同期信号（第６図Ｃ）である。このサン
プリングパルスは、ブランキング内のパルスであ
れば何でも良い。サンプルホールドした出力は第
６図ｄとなり、１水平走査ごとの電圧差ΔV1はほ
ぼV1−V2となる。これを波形整形部３８で増幅
し、制御信号発生部３９でスイツチ２９，３０を
制御すべく電圧レベル、位相が合わされる。DESCRIPTION OF THE EMBODIMENTS The embodiment will be explained with reference to FIGS. 5 and 6. The line-sequential color signal demodulated by FM and amplified by the amplifier 26 is converted into R-Y and B for each horizontal scanning period as shown in FIG. 6b.
-Y is multiplexed, and the voltage value of the blanking part is different from V 2 volts and V 1 volt by V 1 -V 2 =ΔV. As mentioned above, this is due to the difference in FM carrier frequency. The blanking portion of this color signal is sampled and held in a sample and hold section 37. In the example, the sampling pulse is
This is a horizontal synchronization signal (FIG. 6C) extracted by the synchronization separation unit 27 from the luminance signal Y of FIG. 6A. This sampling pulse may be any pulse within blanking. The sampled and held output is as shown in FIG. 6d, and the voltage difference ΔV 1 for each horizontal scan is approximately V 1 −V 2 . This is amplified by the waveform shaping section 38, and the voltage level and phase are matched by the control signal generating section 39 in order to control the switches 29 and 30.
発明の効果
本発明によれば、FMの搬送波周波数がずれて
も、Ｂ−ＹとＲ−Ｙの搬送波周波数の相対値が、
検波したブランキング部分の電圧値の差V1−V2
になり、ほぼΔV1になり、Ｒ−ＹとＢ−Ｙの識別
のためには上記ΔV1を基準値と比較してパルス化
できれば良いことから、搬送波周波数のズレに対
する許容値を大きくすることができる。Effects of the Invention According to the present invention, even if the FM carrier wave frequency deviates, the relative values of the carrier wave frequencies of B-Y and R-Y are
Difference in voltage value of detected blanking part V 1 −V 2
, approximately ΔV 1 , and in order to distinguish R-Y and B-Y, it is sufficient to compare the above ΔV 1 with the reference value and convert it into a pulse. Therefore, the tolerance value for carrier frequency deviation should be increased. I can do it.
また、サンプリングパルス（第６図Ｃ）の立下
りエツジの状態をホールドする回路構成の場合、
サンプリングパルスの幅が、ブランキング期間と
した場合、２種類の色差信号の切りかわり点が、
ブランキング内の任意の点で良く、記録側での切
りかわり点設定の自由度がふえる。 In addition, in the case of a circuit configuration that holds the state of the falling edge of the sampling pulse (Fig. 6C),
If the width of the sampling pulse is the blanking period, the switching point between the two types of color difference signals is
Any point within the blanking can be used, increasing the degree of freedom in setting the switching point on the recording side.
第１図は従来の電子スチルカメラ記録部のブロ
ツク図、第２図は記録信号のスペクトル図、第３
図は従来の電子スチルカメラ再生部のブロツク
図、第４図は電子スチルカメラの色差信号同時化
の動作説明図、第５図は本発明の色差信号識別装
置の一実施例のブロツク図、第６図はその信号波
形図である。
１６……ヘツド、１７……ヘツドアツプ、１８
……ハイパスフイルタ、１９，２４……リミツ
タ、２０，２５……FM復調器、２１，２６……
増幅器、２２……混合器、２３……ロウパスフイ
ルタ、２７……同期分離部、２８……1H遅延装
置、３１……カラーエンコーダ、３７……サンプ
リングホールド、３８……波形整形部、３９……
制御信号発生部。
Figure 1 is a block diagram of a conventional electronic still camera recording section, Figure 2 is a spectrum diagram of the recorded signal, and Figure 3 is a diagram of the recording section of a conventional electronic still camera.
FIG. 4 is a block diagram of a conventional electronic still camera playback section, FIG. 4 is an explanatory diagram of the operation of color difference signal synchronization in an electronic still camera, and FIG. 5 is a block diagram of an embodiment of the color difference signal identification device of the present invention. FIG. 6 is a diagram of the signal waveform. 16...Head, 17...Head up, 18
...High pass filter, 19,24...Limiter, 20,25...FM demodulator, 21,26...
Amplifier, 22...Mixer, 23...Low pass filter, 27...Synchronization separation unit, 28...1H delay device, 31...Color encoder, 37...Sampling hold, 38...Waveform shaping unit, 39... …
Control signal generator.
Claims (1)
この色信号を２種類の色差信号に分けて１水平走
査期間毎に交互に、かつそれぞれの少くともブラ
ンキング部分の直流電圧を異なえて多重する色差
信号の線順次方式で伝送あるいは記録した信号を
受信あるいは再生する時に、線順次化した色信号
のブランキング部の一部あるいは全部をサンプリ
ングする手段と、その値をホールドする手段と、
このホールド値を基準値と比較する手段と、その
比較の結果を論理的に表わす波形整形手段をそな
えることにより、受信あるいは再生した１水平走
査期間毎の色差信号の種類を識別することを特徴
とする色差信号識別装置。1. Dividing a video signal into a luminance signal and a color signal, and further dividing this color signal into two types of color difference signals and multiplexing them alternately every horizontal scanning period and with different DC voltages at least in the blanking portion of each. When receiving or reproducing a signal transmitted or recorded in a line-sequential color difference signal, means for sampling part or all of a blanking portion of a line-sequential color signal, and means for holding the value;
The feature is that the type of color difference signal received or reproduced for each horizontal scanning period is identified by providing means for comparing this hold value with a reference value and a waveform shaping means for logically representing the result of the comparison. color difference signal identification device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58211320A JPS60103792A (en) | 1983-11-10 | 1983-11-10 | Color-difference signal identifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58211320A JPS60103792A (en) | 1983-11-10 | 1983-11-10 | Color-difference signal identifying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60103792A JPS60103792A (en) | 1985-06-08 |
| JPH0446506B2 true JPH0446506B2 (en) | 1992-07-30 |
Family
ID=16603992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58211320A Granted JPS60103792A (en) | 1983-11-10 | 1983-11-10 | Color-difference signal identifying device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60103792A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60134590A (en) * | 1983-12-22 | 1985-07-17 | Fuji Photo Film Co Ltd | Line sequential discriminating circuit |
| JPH0636611B2 (en) * | 1985-11-01 | 1994-05-11 | 旭光学工業株式会社 | A line-sequential signal identifying circuit in a reproducing circuit for signals recorded by the color difference line-sequential method |
-
1983
- 1983-11-10 JP JP58211320A patent/JPS60103792A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60103792A (en) | 1985-06-08 |
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