JPS6358515B2 - - Google Patents
Info
- Publication number
- JPS6358515B2 JPS6358515B2 JP56215272A JP21527281A JPS6358515B2 JP S6358515 B2 JPS6358515 B2 JP S6358515B2 JP 56215272 A JP56215272 A JP 56215272A JP 21527281 A JP21527281 A JP 21527281A JP S6358515 B2 JPS6358515 B2 JP S6358515B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video
- present
- field
- 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.)
- Expired
Links
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000015654 memory Effects 0.000 description 5
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
- H04N7/169—Systems operating in the time domain of the television signal
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Description
【発明の詳細な説明】
本発明は、映像２チヤンネル伝送装置に関し、
特に新規な盗視聴防止用の映像２チヤンネル伝送
におけるフイールド切替暗号化方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-channel video transmission device,
In particular, the present invention relates to a new field switching encryption method for two-channel video transmission to prevent eavesdropping.
従来、水平時間軸圧縮形の映像２チヤンネル伝
送は、第１図の様に２つの映像信号を、それぞれ
水平時間軸方向に1/2に圧縮して、１つの映像信
号として合成し、通常の伝送線路１本を用いて２
つの映像信号を伝送することを可能にしたもの
で、放送局のENGシステムの増強に対応する接
置として威力を発揮している。 Conventionally, two-channel video transmission using horizontal time axis compression compresses two video signals by half in the horizontal time axis direction and combines them into a single video signal, as shown in Figure 1. 2 using one transmission line
This enables the transmission of two video signals, making it an effective stationary device for enhancing the ENG system of broadcasting stations.
前述の様に伝送される信号自体は、一般家庭で
受信される対象でない場合には従来通りで支障は
ないが、これをCATV等と接続することを考え
た場合従来通りで伝送すると、映像２チヤンネル
伝送装置の受信部なしで、受信したとしても、映
像信号は、水平方向に圧縮された信号ではある
が、一応鑑賞に堪える映像であるので、無断受信
ができ得るという問題点があつた。 As mentioned above, if the transmitted signal itself is not to be received in a general home, there will be no problem as usual, but when considering connecting it to CATV etc., if it is transmitted in the conventional manner, the video 2 Even if the video signal is received without the receiving section of the channel transmission device, the video signal is a horizontally compressed signal, but the video is still watchable, so there is a problem that it can be received without permission.
したがつて、本発明の目的は、水平方向に画像
を圧縮して２チヤンネル分の画像を伝送する２チ
ヤンネル伝送において、一般の受信機で受信した
場合は正常な画像が得られないようにする映像２
チヤンネル伝送におけるフイールド切替暗号化方
式を提供することである。 Therefore, an object of the present invention is to prevent normal images from being obtained when received by a general receiver in two-channel transmission in which images are compressed in the horizontal direction and images for two channels are transmitted. Video 2
An object of the present invention is to provide a field switching encryption method for channel transmission.
本発明によれば、フイールド切り替え方式を応
用することにより、送信部で２つの映像信号Ａ及
びＢを合成するときに、フイールドごとに映像信
号ＡとＢとの位置を入れかえて合成して伝送する
ことにより暗号化する映像２チヤンネル伝送にお
けるフイールド切替暗号化方式が得られる。 According to the present invention, by applying a field switching method, when two video signals A and B are combined in the transmitter, the positions of the video signals A and B are switched for each field, and the combined signals are transmitted. As a result, a field switching encryption method in two-channel video transmission to be encrypted can be obtained.
本発明においては、第２図に示す様に、２チヤ
ンネル伝送時には映像信号Ａ及びＢは、フイール
ドごとに入れかわつているので通常の受信機で受
信した信号をモニターテレビで見ると、信号Ａ，
ＢはそれぞれがＡとＢが２重写しになつて見え
る。 In the present invention, as shown in FIG. 2, during two-channel transmission, video signals A and B are switched for each field, so when the signal received by a normal receiver is viewed on a monitor TV, the signal A,
Each B appears to be a double copy of A and B.
次に本発明を、図面を参照ながら詳細に説明し
てゆく。第２図を参照すると、本発明は、帯域圧
縮型映像２チヤンネル伝送装置において、送信部
で２つの映像信号Ａ及びＢをそれぞれ水平方向に
１／２に圧縮して１つの映像信号として合成すると
き、通常は、Ａの信号を左側に、Ｂの信号を右側
にして合成しているのに対して、フイールドごと
に、Ａ及びＢの左右を逆にして合成することによ
り、合成された信号は、そのままモニタレビで見
ると、左右ともＡとＢが２重写しになつた映像と
なる。これにより、伝送時に無断受信することに
対応できる。合成して伝送された信号は、受信部
で、ＡとＢを分離して、水平方向に２倍に拡大さ
れるが、このとき、送信部と逆の操作を行つて、
元の信号に戻すわけである。 Next, the present invention will be explained in detail with reference to the drawings. Referring to FIG. 2, the present invention provides a band compression type video 2-channel transmission device in which a transmitter compresses two video signals A and B by half in the horizontal direction and combines them into one video signal. Normally, the A signal is placed on the left side and the B signal is placed on the right side. When viewed directly on a TV monitor, the image becomes a double copy of A and B on both the left and right sides. This makes it possible to cope with unauthorized reception during transmission. The combined and transmitted signal is separated into A and B in the receiving section and expanded twice in the horizontal direction.
This will restore the original signal.
第３図は本発明の一実施例を示す図で、入力信
号Ａ，Ｂを端子１，２からそれぞれＡ／Ｄ変換器
３，４に送り、7.2MHz周期のクロツクCL1で標本
化しデイジタル信号に変換する。このデイジタル
信号を、やはり、クロツクCL1でメモリ５，６
に、それぞれ書き込む。そして、メモリ５，６に
書き込まれたデイジタル信号を読み出す時に、ク
ロツクCL1の２倍の周波数をもつ14.3Mzのクロツ
クCL2で読み出す。この時、メモリのアドレス制
御は、書き込みも読み出しもクロツクCL2で行う
ので、メモリの出力信号は、水平時軸方向に圧縮
された信号となる。従つて、アドレスを制御する
ことによつて、Ａの信号を、画面を縦に２分割し
た左側に、Ｂの信号を右側に出力する様な形式
と、その逆の形式の２つの出力形成が可能にな
る。 FIG. 3 is a diagram showing an embodiment of the present invention, in which input signals A and B are sent from terminals 1 and 2 to A/D converters 3 and 4, respectively, and are sampled by a clock CL 1 with a 7.2 MHz cycle and converted into digital signals. Convert to This digital signal is also sent to memories 5 and 6 by clock CL1.
Write each. When reading out the digital signals written in the memories 5 and 6, the clock CL2 of 14.3Mz, which has twice the frequency of the clock CL1 , is used. At this time, address control of the memory is performed by the clock CL2 for both writing and reading, so the output signal of the memory becomes a signal compressed in the horizontal time axis direction. Therefore, by controlling the address, it is possible to form two outputs: one in which the A signal is output to the left side of the screen vertically divided into two, and the B signal to the right side, and the other way around. It becomes possible.
実施例では、メモリ５，６から読み出された信
号を切替えるスイツチを２個（切替スイツチ７，
８）設け、この２つの形式をそれぞれ独立に設定
し、映像V1，V2の様に２種類の出力信号が得ら
れるようにしている。これを切り替え器９で、垂
直同期信号Ｖにより切り替えて、それをＤ／Ａ変
換器１０で14MHz周期のクロツクCL2で、アナロ
グ信号に変換して、暗号化された水平時間軸圧縮
の映像２チヤンネル合成信号を得ている。 In the embodiment, there are two switches (changeover switches 7,
8), and these two formats are set independently, so that two types of output signals such as video V 1 and V 2 can be obtained. This is switched by the switch 9 using the vertical synchronization signal V, and converted to an analog signal by the D/A converter 10 using the clock CL 2 with a 14 MHz cycle, and the encrypted horizontal time axis compressed video 2 A channel composite signal is obtained.
尚、第３図ではデータ系で処理した形で示した
が、コントロール系で処理しても同様な結果が得
られる。 Although FIG. 3 shows the data processed by the data system, similar results can be obtained by processing by the control system.
本発明は以上説明したように水平時間軸圧縮形
映像２チヤンネル伝送において、フイールドごと
に右の映像と左の映像を入れかえることにより、
伝送される信号を暗号化する効果があり、２つの
信号のレベル差が大きくても、方式的に垂直時間
軸方向には、その差は現われないという特長を有
する。 As explained above, the present invention swaps the right and left images for each field in horizontal time axis compressed video two-channel transmission.
It has the effect of encrypting the transmitted signal, and has the advantage that even if the level difference between two signals is large, the difference does not appear in the vertical time axis direction.
第１図は本発明を適用した場合の信号の流れを
示す図で、P1,2は入力信号をモニターテレビで見
た図で、P3はP1,2をそれぞれ水平時間軸に圧縮し
て合成した信号をモニターしたもので、P4,5はP3
の左右を分離して、それぞれを水平時間軸方向に
２倍に拡大して、元の信号に戻したものである。
第２図は、本発明の実施例の信号の流れを示した
図で、Q1は、水平時間軸に1/2に圧縮された２つ
の映像信号Ａ，Ｂを１つの映像信号として合成し
た信号、Q2は、本発明により暗号化された信号
の第１フイールドにおける形態、Q3は第２フイ
ールド、Q4はSigの第３フイールド、Q5はSigの
第４フイールドにおける信号形態であり、以後同
様に、左右がフイールド単位で入れかわつている
ことを示している、Q6は暗号化された信号をモ
ニタテレビで見た図である。
第３図は本発明の一実施例を示す図で、３，４
……Ａ／Ｄコンバータ、５，６……メモリ、７，
８，９……スイツチ、１０……Ｄ／Ａコンバー
タ、１１……制御回路。
Figure 1 is a diagram showing the signal flow when the present invention is applied, where P 1 and 2 are input signals viewed on a monitor TV, and P 3 is a diagram showing how P 1 and 2 are compressed on the horizontal time axis. P 4,5 is P 3
The left and right sides of the image are separated, each is expanded twice in the horizontal time axis direction, and the original signal is restored.
Figure 2 is a diagram showing the signal flow of the embodiment of the present invention. The signal Q 2 is the form of the signal encrypted according to the invention in the first field, Q 3 is the second field, Q 4 is the third field of Sig, and Q 5 is the signal form in the fourth field of Sig. , and thereafter similarly show that left and right are swapped in field units.Q 6 is a diagram of the encrypted signal viewed on a monitor TV. FIG. 3 is a diagram showing an embodiment of the present invention.
...A/D converter, 5, 6...Memory, 7,
8, 9...Switch, 10...D/A converter, 11...Control circuit.
Claims (1)
圧縮して左右に配置することにより伝送すると
き、フイールド単位で２つの映像信号の配置を変
えることを特徴とする映像２チヤンネル伝送にお
けるフイールド切替暗号化方式。1. Field switching encryption in video two-channel transmission characterized by changing the arrangement of the two video signals in field units when transmitting the two video signals by compressing them in the horizontal time axis direction and arranging them on the left and right. method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56215272A JPS58111594A (en) | 1981-12-25 | 1981-12-25 | Field switching encrypting system in two-channel transmission of picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56215272A JPS58111594A (en) | 1981-12-25 | 1981-12-25 | Field switching encrypting system in two-channel transmission of picture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58111594A JPS58111594A (en) | 1983-07-02 |
| JPS6358515B2 true JPS6358515B2 (en) | 1988-11-16 |
Family
ID=16669556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56215272A Granted JPS58111594A (en) | 1981-12-25 | 1981-12-25 | Field switching encrypting system in two-channel transmission of picture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58111594A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843685A (en) * | 1981-09-10 | 1983-03-14 | Sony Corp | Television signal sending-out system |
-
1981
- 1981-12-25 JP JP56215272A patent/JPS58111594A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5843685A (en) * | 1981-09-10 | 1983-03-14 | Sony Corp | Television signal sending-out system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58111594A (en) | 1983-07-02 |
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