JPH0497689A - Signal transmission system for cable television receiver - Google Patents
Signal transmission system for cable television receiverInfo
- Publication number
- JPH0497689A JPH0497689A JP21538590A JP21538590A JPH0497689A JP H0497689 A JPH0497689 A JP H0497689A JP 21538590 A JP21538590 A JP 21538590A JP 21538590 A JP21538590 A JP 21538590A JP H0497689 A JPH0497689 A JP H0497689A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- cable
- television receiver
- cable television
- transmission system
- 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
Links
- 230000008054 signal transmission Effects 0.000 title claims description 6
- 239000002131 composite material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Color Television Systems (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明はケーブルテレビに適用される信号伝送方式に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal transmission system applied to cable television.
[発明の概要コ
本発明は3チヤンネルを用してR信号、G信号及びB信
号を独立に伝送することにより、安価に高色解像度の信
号を受信でき、安価に大画面向きの放送を受信できるも
のである。[Summary of the Invention] The present invention independently transmits R, G, and B signals using three channels, thereby making it possible to receive signals with high color resolution at low cost, and to receive broadcasts suitable for large screens at low cost. It is possible.
[従来の技術]
近年、テレビジョン放送を大画面のワイドスクリーン(
例えば横2.4m)で映して観賞することが行われてい
るが、通常の放送形式では色解像度が50本程度となり
非常に低い。そのため、衛星放送にて輝度信号とクロマ
信号を別のチャンネル局を用い独立して伝送することに
より色解像度を高める技術が提案されている。[Conventional technology] In recent years, television broadcasting has been changed to a large wide screen (
For example, it is commonly viewed by displaying the screen at a width of 2.4 meters (2.4 meters wide), but the color resolution of the normal broadcasting format is approximately 50 lines, which is extremely low. Therefore, a technique has been proposed in which the color resolution is increased by independently transmitting the luminance signal and chroma signal using separate channel stations in satellite broadcasting.
[発明が解決しようとする課題]
しかしながら、上記のように衛星放送で複数チャンネル
を用いると送信側はもちろんのこと受信側では衛星放送
用の高価なチューナを二台準備しなければならないため
受信側にとって非常に高価な伝送方式になってしまうと
いう欠点があった。[Problem to be solved by the invention] However, when multiple channels are used in satellite broadcasting as described above, not only the transmitting side but also the receiving side must prepare two expensive tuners for satellite broadcasting. The drawback was that it became a very expensive transmission method.
そこで、本発明は大画面向きの放送を安価に受信できる
伝送方式を提供することを課題とする。Therefore, an object of the present invention is to provide a transmission system that can receive broadcasts suitable for large screens at low cost.
[課題を解決するための手段
上記課題を達成するための本発明に係るケーブルテレビ
の信号伝送方式は、テレビ信号を構成するR信号、G信
号及びB信号をそれぞれ異なるチャンネル局を用いて独
立にケーブルで伝送したものである。[Means for Solving the Problems To achieve the above problems, the cable television signal transmission system according to the present invention transmits the R signal, G signal and B signal constituting the television signal independently using different channel stations. It was transmitted by cable.
[作用]
3チヤンネルを用いるため受信側は三台のチューナを設
置する必要があるが、ケーブルで信号伝送されるため低
周波で、且つ、外乱も受けず非常に安価なチューナを王
台用意すればよい。[Function] Since three channels are used, it is necessary to install three tuners on the receiving side, but since the signal is transmitted by cable, it is necessary to prepare a very inexpensive tuner that uses low frequencies and is not affected by external disturbances. Bye.
[実施例] 以下、本発明の実施例を図面を用いて説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.
第1図は本発明の一実施例を示す信号伝送方式の回路ブ
ロック図である。第1図において、放送側である送信装
置Aとユーザ側である各受信装置B、、B、とはケーブ
ルCを介して接続されてケーブルテレビのシステムが構
成されている。ケーブルテレビは1チヤンネルからnチ
ャンネルまで有している。送信装置Aは1チヤンネルか
らnチャンネルに対応してn個の変調器M1〜M7を宵
し、各変調器M1〜M、はそれぞれ異なる周波数f、〜
fアにテレビジョン信号を変調する。一方、カメラ1が
出力するR信号、G信号及びB信号はワイド画サイズ(
縦横比が916)のテレビジョン信号であり、これらの
各色信号は三つの変調器M1〜M3にそれぞれ入力され
ている。この各色信号はそれぞれ1〜3チヤンネルのテ
レビジョン信号として送信される。又、前記カメラ1の
R信号。FIG. 1 is a circuit block diagram of a signal transmission system showing one embodiment of the present invention. In FIG. 1, a transmitting device A on the broadcasting side and each receiving device B on the user side are connected via a cable C to form a cable television system. Cable TV has channels from 1 channel to N channel. The transmitter A has n modulators M1 to M7 corresponding to channels 1 to n, and each modulator M1 to M has a different frequency f, ~.
modulates the television signal into a f. On the other hand, the R signal, G signal, and B signal output by camera 1 are wide image size (
This is a television signal with an aspect ratio of 916), and each of these color signals is input to three modulators M1 to M3, respectively. Each color signal is transmitted as a television signal of 1 to 3 channels. Also, the R signal of the camera 1.
G信号及びB信号は画サイズ変換器2にも導かれ、ここ
で画サイズがノーマル(縦横比が3.4)のコンポジッ
ト信号に変換される。変換の結果、画面上でテレビジョ
ン信号のない上下には黒色の映像信号を挿入し、このコ
ンポジット信号は変調器M4に導かれ、4チヤンネルの
テレビジョン信号として送信される。他の変調器M5〜
M5にも図示しないがテレビジョン信号が導かれ、この
全ての変調器M1〜M、の出力は加算器3で重畳されて
伝送される。The G signal and B signal are also led to the picture size converter 2, where they are converted into a composite signal with a normal picture size (an aspect ratio of 3.4). As a result of the conversion, a black video signal is inserted above and below the screen where there is no television signal, and this composite signal is guided to the modulator M4 and transmitted as a 4-channel television signal. Other modulators M5~
A television signal (not shown) is also guided to M5, and the outputs of all the modulators M1 to M are superimposed by an adder 3 and transmitted.
−の受信装置B1は三台のチューナ01〜C3を有し、
各チューナC1〜C3にケーブルCからのテレビジョン
信号が入力されている。チューナC1は周波数f1に、
チューナC2は周波数f2に、チューナC8は周波数f
3にそれぞれチューニングされている。そして、この各
チューナCI” Csの出力は例えば大画面のワイドス
クリーン(幅2.4m)に映像を映すプロジェクタ(図
示せず)に導かれている。- the receiving device B1 has three tuners 01 to C3,
A television signal from cable C is input to each tuner C1 to C3. tuner C1 to frequency f1,
Tuner C2 is tuned to frequency f2, and tuner C8 is tuned to frequency f.
Each is tuned to 3. The output of each tuner CI"Cs is led to a projector (not shown) that projects an image on a large wide screen (width 2.4 m), for example.
他の受信装置B2は1台のチューナC4のみを有し、こ
のチューナC4には前記と同様にケーブルCからのテレ
ビジョン信号が入力され周波数f4にチューニングされ
ている。そして、このチューナC4の出力は例えば小画
面のモニタ(図示せず)に導かれている。The other receiving device B2 has only one tuner C4, and the television signal from the cable C is input to this tuner C4 and tuned to the frequency f4 in the same manner as described above. The output of this tuner C4 is led to, for example, a small screen monitor (not shown).
上記構成において、1チヤンネルから4チヤンネルまで
の放送が開始されると、カメラ1のテレビジョン信号の
内R信号は1チヤンネルのテレビジョン信号として、G
信号は2チヤンネルのテレビジョン信号として、B信号
は3チヤンネルのテレビジョン信号としてケーブルCを
介して送信されると共に上記のノーマルサイズのコンポ
ジット信号が4チヤンネルのテレビジョン信号としても
送信される。−の受信装置B1は1チヤンネルから3チ
ヤンネルまでの放送を受信し、チューナCIはR信号を
、チューナC2はG信号を、チューナC3はB信号をそ
れぞれ受信して、これらの信号がプロジェクタ(図示せ
ず)に送られてワイドスクリーンに映像が映し出される
。この映像は各色信号を独立のチャンネルで伝送してい
るため高色解像度となる。そして、三台のチューナC1
〜C3が必要であるがケーブルCで伝送される信号を受
信するものであるため非常に安価である。他の受信装置
B2は4チヤンネルの放送を受信し、このコンポジット
のテレビジョン信号がモニタ(図示せず)に映し出され
る。従って、三台のチューナC1〜C3を持っているユ
ーザは大画面に適した放送を受信でき、又、−台のチュ
ーナC4しか持っていないユーザは大画面用の放送を受
信できないが同じ放送を受信できる。In the above configuration, when broadcasting from channel 1 to channel 4 is started, the R signal of the television signal of camera 1 is converted to G as the television signal of channel 1.
The signal is transmitted as a 2-channel television signal, the B signal is transmitted as a 3-channel television signal via cable C, and the above-mentioned normal size composite signal is also transmitted as a 4-channel television signal. Receiving device B1 receives broadcasts from channel 1 to channel 3, tuner CI receives R signal, tuner C2 receives G signal, and tuner C3 receives B signal, and these signals are transmitted to the projector (Fig. (not shown) and the image is displayed on a wide screen. This video has high color resolution because each color signal is transmitted on an independent channel. And three tuners C1
~C3 is required, but since it receives the signal transmitted by cable C, it is very inexpensive. Another receiving device B2 receives the 4-channel broadcast, and this composite television signal is displayed on a monitor (not shown). Therefore, a user who has three tuners C1 to C3 can receive broadcasts suitable for large screens, and a user who has only - tuner C4 cannot receive broadcasts for large screens, but can receive the same broadcasts. Can receive.
尚、送信装置A側でテレビジョン信号として例えばY信
号(4,5MHz) 、R−Y信号(1,5MHz)、
B−Y信号(1、5M Hz )を扱うときにはRGB
信号に変換してから伝送することか好ましい。Incidentally, on the transmitter A side, television signals such as Y signal (4.5 MHz), RY signal (1.5 MHz),
When handling B-Y signals (1.5MHz), RGB
It is preferable to convert it into a signal and then transmit it.
[発明の効果]
以上述べたように本発明によれば、ケーブルテレビの3
チヤンネルを用いてR信号、G信号及びB信号を独立に
伝送したので、ケーブルテレビ用の安価なチューナを王
台用いれば高色解像度の信号を受信でき、安価に大画面
向きの放送を受信できるという効果を奏する。[Effects of the Invention] As described above, according to the present invention, the three
Since the R signal, G signal, and B signal were transmitted independently using a channel, by using an inexpensive tuner for cable TV, signals with high color resolution can be received, and broadcasts suitable for large screens can be received at low cost. This effect is achieved.
また、衛星放送のように無線で複数チャンネルを用いて
伝送するときには外乱によって時間すれ等の不具合か生
じるが、本発明はケーブルで伝送したのでかかる不具合
が生じないという利点がある。Furthermore, when transmitting by radio using multiple channels like satellite broadcasting, problems such as time lag may occur due to disturbances, but the present invention has the advantage that such problems do not occur because the transmission is carried out by cable.
第1図は本発明の一実施例を示す信号伝送方式の回路ブ
ロック図である。
C・・・ケーブル。FIG. 1 is a circuit block diagram of a signal transmission system showing one embodiment of the present invention. C...Cable.
Claims (1)
をそれぞれ異なるチャンネル局を用いて独立にケーブル
で伝送したことを特徴とするケーブルテレビの信号伝送
方式。(1) A cable television signal transmission system characterized in that the R signal, G signal, and B signal constituting the television signal are independently transmitted by cable using different channel stations.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2215385A JP2985259B2 (en) | 1990-08-15 | 1990-08-15 | Cable TV signal transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2215385A JP2985259B2 (en) | 1990-08-15 | 1990-08-15 | Cable TV signal transmission system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0497689A true JPH0497689A (en) | 1992-03-30 |
JP2985259B2 JP2985259B2 (en) | 1999-11-29 |
Family
ID=16671428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2215385A Expired - Fee Related JP2985259B2 (en) | 1990-08-15 | 1990-08-15 | Cable TV signal transmission system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2985259B2 (en) |
-
1990
- 1990-08-15 JP JP2215385A patent/JP2985259B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2985259B2 (en) | 1999-11-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |