JPH0237141B2 - SHINGOKIRIKAESOCHI - Google Patents
SHINGOKIRIKAESOCHIInfo
- Publication number
- JPH0237141B2 JPH0237141B2 JP12596684A JP12596684A JPH0237141B2 JP H0237141 B2 JPH0237141 B2 JP H0237141B2 JP 12596684 A JP12596684 A JP 12596684A JP 12596684 A JP12596684 A JP 12596684A JP H0237141 B2 JPH0237141 B2 JP H0237141B2
- Authority
- JP
- Japan
- Prior art keywords
- shf
- signal
- input
- output
- potential
- 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
- 239000002131 composite material Substances 0.000 description 4
- 230000005236 sound signal Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
産業上の利用分野
本発明は、衛星(SHF)放送が受信能な如く
SHFチユーナを内蔵したテレビジヨン受像機に
於ける信号切換装置に関するものである。
従来例の構成とその問題点
現在、衛星放送が実用化され、それに伴つてこ
れを受信可能なテレビジヨン受像機が提案されて
いる。現在は、衛星放送(以下SHF放送と略称
する)を受信するための、いわゆるSHFチユー
ナをテレビジヨン受像機と別個に設け、この
SHFチユーナで、受信したSHF信号をベースバ
ンドの複合映像信号と音声信号とに復調すると共
に、チヤンネル選局が行える様にしており、上記
複合映像信号と音声信号をテレビジヨン受像機の
映像入力端子と音声入力端子に入力するように
し、映像処理回路と音声処理回路を介して、その
映像および音声を陰極線管画面に映出およびスピ
ーカより放声する様にしている。
ところで、いま上記SHFチユーナをテレビジ
ヨン受像機内に一体的に組み込み、信号切換等の
操作が容易に行える様にした、いわゆるSHFチ
ユーナ内蔵型のテレビジヨン受像機が提案されて
いる。
まず、この様なSHFチユーナ内蔵型のテレビ
ジヨン受像機の構成について説明する。第1図に
於いては、1はVHF・UHFチユーナ、2は上記
チユーナ1の出力を検波処理する回路、3は
SHF放送を受信するためのSHFチユーナ、4は
上記回路2からの複合映像信号・音声信号と
SHFチユーナ3からの複合映像信号・音声信号
を切換える切換回路、5はこの切換回路4を制御
する制御回路、6,7おのおのは外部映像および
音声入力端子、8は上記切換回路4の出力と外部
映像および音声入力端子6,7へ加わる映像およ
び音声信号を切換えて出力する切換回路、9はこ
の切換回路8を制御する制御回路、10は文字多
重アダプタ11を接続するための21ピン端子、1
2はこの21ピン端子10から供給される複合映像
信号と切換回路8の出力を切換えて出力する切換
回路、13はこの切換回路12を制御する制御回
路、14は映像処理回路、15はクロマ出力回
路、16は偏向回路、17はカラー陰極線管、1
8は音声処理回路、19は音声出力回路、20は
スピーカである。
従つて、上記構成において、各制御回路5,
9,13にて、切換回路4よりSHFチユーナ3
からの出力信号を、切換回路8より切換回路4か
らの出力信号を、切換回路12より切換回路8の
出力信号を選択して出力する様に各切換回路4,
8,12を制御することにより、SHFチユーナ
3で受信し選局したSHF放送の希望チヤンネル
の番組を視聴することが可能となる。
ここで、上記した様に受像機と別個にSHFチ
ユーナを備えたSHF受信システムに於いて、
SHF放送を受信し視聴するには、テレビジヨン
受像機をまずビデオモードにし、SHFチユーナ
の選局操作をしなければならず、操作が面倒であ
る。
そこで、上記SHFチユーナを内蔵したテレビ
ジヨン受像機に於いては、テレビジヨン受像機本
体の前面にVHF放送、UHF放送、SHF放送の各
選局スイツチ(選局釦)を配置しておき、これら
選局釦を押圧するだけの操作でVHFまたはUHF
放送のチヤンネル、あるいはSHF放送のチヤン
ネル選局が行えるとともに選局されたチヤンネル
の放送波が映像・音声の処理回路に供給される様
に動作することが望まれる。
一方、国内に於いては、VHF・UHF放送は受
信することが出来ず、SHF放送のみしか受信出
来ない地域が存在し、また地域によつてはSHF
放送を優先して、すなわち電源投入時に、まず
SHF放送を受信して視聴したいという地域もあ
る。従つて、これらの要望を満たす装置の開発が
望まれる。
発明の目的
本発明は上記要望点に鑑み、VHF・UHF放送
とSHF放送のいずれかを優先して受信する様に
設定することが出来、かつ選局釦を操作すれば希
望の放送の希望のチヤンネルを選局するととも
に、その信号を処理回路へ選択供給することの出
来る信号切換装置を提供することを目的とする。
発明の構成
本発明による選局制御装置は、VHF・UHF放
送とSHF放送のいずれかを優先して受信するよ
うに設定することが出来る優先選択スイツチと、
選局釦を操作すれば希望のチヤンネルを選択する
とともに、その信号を処理回路へ選択供給するこ
との出来る信号切換回路とを備えているもので、
上記優先選択スイツチによつて電源投入時まず
SHF放送を視聴することが可能となり、また選
局釦を操作すれば、そのチヤンネル(放送波)の
テレビジヨン信号を信号処理回路に供給する様に
切換回路を制御することが出来て操作が容易とな
り、実用上極めて便利となる。
実施例の説明
以下、本発明の一実施例について第2図を用い
て説明する。第2図は、第1図の制御回路5の要
部の構成を示すものである。
図中、21はリセツト端子R1,R2を持つ2つ
のJ−Kフリツプフロツプより構成される制御回
路、22は電源投入時の切換回路4の状態を決定
する優先選択スイツチで、第1の固定端子aを上
記制御回路21の出力Q1(9ピン端子)に接続し
ており、第2の固定端子bを出力2(13ピン端
子)に接続しており、可動端子を切換回路4に接
続している。23,24はおのおのNANDゲー
トで、NANDゲート23の一方の入力にはSHF
放送の選局を行つたときに発生するSHFデイフ
イートパルスを供給する様にしており、他方の入
力にはビデオモード時(端子6,7に加わる外部
映像信号を選択している状態)は、ローレベル
“L”となり、それ以外のモードではハイレベル
“H”となる信号を加えている。またNANDゲー
ト24の一方の入力にはVHF・UHF放送の選局
を行なつた時に発生するVHF・UHFデイフイー
トパルスを供給する様にしており、また他方の入
力には上記ビデオモード時のみローレベル“L”
となる信号を供給している。そしてNANDゲー
ト23の出力は制御入力C1に接続し、NANDゲ
ート24の出力は制御入力C2に接続している。
また制御回路21のリセツト端子R1,R2はおの
おの抵抗25,26を介して12V端子に接続する
とともにダイオード27,28を介して電源リセ
ツト回路(図示せず)に接続し、さらにリセツト
端子R1はダイオード29を介して制御入力C2に、
リセツト端子R2はダイオード30を介して制御
入力C1におのおの接続している。
上記構成に於いて、次にその動作を説明する。
まず図示する様に優先選択スイツチ22を固定端
子aに接続しているとする。ここで、電源を投入
すると、電源リセツト回路は一瞬ローレベルとな
り、その後ハイレベルとなるが、このローレベル
の時リセツト入力端子R1,R2はローレベルとな
り制御回路21にリセツトがかかり、出力Q1,
Q2はローレベル、出力1,2はハイレベルに変
化する。従つて優先選択スイツチ22が上記状態
にあることにより、その出力はローレベルとな
る。ここで切換回路4が制御回路5の出力がロー
レベルの時はVHF・UHF放送のテレビジヨン信
号を、上記出力がハイレベルの時はSHF放送の
テレビジヨン信号を選択出力する様に構成されて
いるとすると、この時、上記切換回路4は
VHF・UHF放送のテレビジヨン信号を切換回路
8に供給する。従つて、この時はVHF・UHF放
送の番組が優先してまず映出されることとなる。
そして、その後VHFまたはUHF放送の選局操作
を行つた時は、VHF・UHFデイフイートパルス
が発生し、NANDゲート24の両入力がハイレ
ベルとなり、出力がローレベルとなり、制御入力
C2がローレベルとなるとともにダイオード29
により一方のリセツト端子R1にリセツトがかか
り、出力状態は、出力Q1はローレベルの状態を
保ち、出力2が反転しローレベルとなる。従つ
て優先選択スイツチ22の出力状態は変わらず、
切換回路4は継続してVHF・UHF放送のテレビ
ジヨン信号を出力する。
VHFもしくはUHF放送のチヤンネルを選局受
信していてSHF放送の選局操作を行なうと、
NANDゲート23の両入力がハイレベル、従つ
て、その出力がローレベルとなり、制御入力C1
がローレベルになるとともにダイオード30によ
りリセツト端子R2にリセツトがかかり、出力2
はハイレベルを維持するが出力Q1は反転しハイ
レベルとなる。従つて切換回路4はSHF放送の
テレビジヨン信号を選択出力する様に切換わる。
一方、優先選択スイツチ22を、あらかじめ固
定端子b側に倒しておいた状態では、電源を投入
すると制御回路21にリセツトがかかり、出力
2がハイレベルとなり、従つて切換回路4はSHF
放送のテレビジヨン信号を選択出力する。ここで
SHF放送の選局操作を行なうとNANDゲート2
3の出力がローレベルとなり、出力2はハイレ
ベルを維持するため切換回路4は継続してSHF
放送の信号を出力する。
SHF放送を受信している状態で、VHFまたは
UHF放送の選局操作を行なうと、NANDゲート
24の出力がローレベルとなるため出力2が反
転してローレベルとなり、切換回路4はSHF放
送に代わつてVHFまたはUHF放送のテレビジヨ
ン信号を出力する。
次表に各状態の時の出力Q1(9番ピン)と出力
Q2(13番ピン)のレベル状態を整理して示す。
Industrial Application Field The present invention is suitable for receiving satellite (SHF) broadcasting.
This invention relates to a signal switching device in a television receiver with a built-in SHF tuner. Conventional Structure and Problems Satellite broadcasting has now been put into practical use, and television receivers capable of receiving it have been proposed. Currently, a so-called SHF tuner for receiving satellite broadcasts (hereinafter referred to as SHF broadcasts) is installed separately from the television receiver.
The SHF tuner demodulates the received SHF signal into a baseband composite video signal and audio signal, and allows channel selection. and is input to the audio input terminal, and the video and audio are projected on a cathode ray tube screen and emitted from a speaker via a video processing circuit and an audio processing circuit. Incidentally, a so-called SHF tuner built-in television receiver has been proposed in which the above-mentioned SHF tuner is integrated into the television receiver so that operations such as signal switching can be performed easily. First, the configuration of such a television receiver with a built-in SHF tuner will be explained. In Figure 1, 1 is a VHF/UHF tuner, 2 is a circuit that detects and processes the output of tuner 1, and 3 is a circuit that detects and processes the output of tuner 1.
SHF tuner 4 receives the composite video signal and audio signal from circuit 2 above.
A switching circuit that switches the composite video signal and audio signal from the SHF tuner 3, 5 a control circuit that controls this switching circuit 4, 6 and 7 each an external video and audio input terminal, 8 the output of the switching circuit 4 and the external A switching circuit that switches and outputs the video and audio signals applied to the video and audio input terminals 6 and 7, 9 a control circuit that controls this switching circuit 8, 10 a 21-pin terminal for connecting a character multiplexing adapter 11, 1
2 is a switching circuit that switches and outputs the composite video signal supplied from this 21-pin terminal 10 and the output of switching circuit 8, 13 is a control circuit that controls this switching circuit 12, 14 is a video processing circuit, and 15 is a chroma output circuit, 16 is a deflection circuit, 17 is a color cathode ray tube, 1
8 is an audio processing circuit, 19 is an audio output circuit, and 20 is a speaker. Therefore, in the above configuration, each control circuit 5,
At 9 and 13, SHF tuner 3 is connected to switching circuit 4.
Each switching circuit 4,
By controlling the channels 8 and 12, it becomes possible to view the program of the desired channel of the SHF broadcast received and selected by the SHF tuner 3. Here, in the SHF receiving system equipped with the SHF tuner separately from the receiver as described above,
In order to receive and view SHF broadcasts, the television receiver must first be set to video mode and the SHF tuner must be operated to select a channel, which is cumbersome to operate. Therefore, in a television receiver equipped with the above-mentioned SHF tuner, each channel selection switch (tuning button) for VHF broadcasting, UHF broadcasting, and SHF broadcasting is placed on the front of the television receiver body. VHF or UHF by simply pressing the channel selection button
It is desirable to be able to select a broadcasting channel or SHF broadcasting channel, and to operate so that the broadcast waves of the selected channel are supplied to the video/audio processing circuit. On the other hand, in Japan, there are areas where it is not possible to receive VHF/UHF broadcasts, and where only SHF broadcasts can be received;
Priority is given to broadcasting, that is, when the power is turned on,
There are some areas where people want to receive and watch SHF broadcasts. Therefore, it is desired to develop a device that satisfies these demands. Purpose of the Invention In view of the above-mentioned requirements, the present invention enables settings to be made so that either VHF/UHF broadcasting or SHF broadcasting is received with priority, and by operating the channel selection button, the desired broadcasting can be selected. It is an object of the present invention to provide a signal switching device capable of selecting a channel and selectively supplying the signal to a processing circuit. Composition of the Invention A channel selection control device according to the present invention includes a priority selection switch that can be set to preferentially receive either VHF/UHF broadcasting or SHF broadcasting;
It is equipped with a signal switching circuit that allows you to select a desired channel by operating a selection button and selectively supply that signal to a processing circuit.
When the power is turned on, the priority selection switch above selects the
It is now possible to watch SHF broadcasts, and by operating the channel selection button, the switching circuit can be controlled to supply the television signal of that channel (broadcast wave) to the signal processing circuit, making it easy to operate. This is extremely convenient in practice. DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 2 shows the configuration of main parts of the control circuit 5 shown in FIG. 1. In the figure, 21 is a control circuit composed of two J-K flip-flops having reset terminals R 1 and R 2 , and 22 is a priority selection switch that determines the state of the switching circuit 4 when the power is turned on. The terminal a is connected to the output Q 1 (9 pin terminal) of the control circuit 21, the second fixed terminal b is connected to the output 2 (13 pin terminal), and the movable terminal is connected to the switching circuit 4. are doing. 23 and 24 are NAND gates, and one input of NAND gate 23 is SHF.
The SHF daily pulse generated when selecting a broadcast station is supplied, and the other input is in video mode (when external video signals applied to terminals 6 and 7 are selected). A signal is added that becomes a low level "L" and becomes a high level "H" in other modes. In addition, one input of the NAND gate 24 is supplied with the VHF/UHF daytime pulse generated when selecting a VHF/UHF broadcast, and the other input is supplied with a low pulse only in the above video mode. Level “L”
It supplies the signal. The output of the NAND gate 23 is connected to the control input C1 , and the output of the NAND gate 24 is connected to the control input C2 .
Further, reset terminals R 1 and R 2 of the control circuit 21 are connected to a 12V terminal via resistors 25 and 26, respectively, and to a power supply reset circuit (not shown) via diodes 27 and 28, and are further connected to a reset terminal R. 1 to control input C 2 via diode 29,
The reset terminals R 2 are each connected via a diode 30 to the control input C 1 . Next, the operation of the above configuration will be explained.
First, assume that the priority selection switch 22 is connected to the fixed terminal a as shown in the figure. Here, when the power is turned on, the power supply reset circuit momentarily goes to low level and then goes to high level, but at this low level, the reset input terminals R 1 and R 2 go to low level and the control circuit 21 is reset, and the output Q1 ,
Q2 changes to low level, and outputs 1 and 2 change to high level. Therefore, since the priority selection switch 22 is in the above state, its output becomes a low level. Here, the switching circuit 4 is configured to selectively output a television signal of VHF/UHF broadcasting when the output of the control circuit 5 is at a low level, and to selectively output a television signal of SHF broadcasting when the output is at a high level. At this time, the switching circuit 4 is
VHF/UHF broadcast television signals are supplied to the switching circuit 8. Therefore, at this time, VHF/UHF broadcast programs will be displayed first with priority.
Then, when a VHF or UHF broadcast channel selection operation is performed, a VHF/UHF day-to-day pulse is generated, both inputs of the NAND gate 24 become high level, the output becomes low level, and the control input
As C 2 becomes low level, diode 29
As a result, one reset terminal R1 is reset, and the output state is that the output Q1 remains at a low level, and the output 2 is inverted and becomes a low level. Therefore, the output state of the priority selection switch 22 remains unchanged.
The switching circuit 4 continuously outputs the television signal of VHF/UHF broadcast. If you tune in to a VHF or UHF broadcasting channel and then tune in to an SHF broadcast,
Both inputs of the NAND gate 23 are at high level, so its output is at low level, and the control input C 1
goes low level and the reset terminal R2 is reset by the diode 30, and the output 2
maintains a high level, but the output Q1 is inverted and becomes a high level. Therefore, the switching circuit 4 is switched to selectively output the SHF broadcast television signal. On the other hand, if the priority selection switch 22 is set in advance to the fixed terminal b side, when the power is turned on, the control circuit 21 is reset and the output is
2 becomes high level, so the switching circuit 4 becomes SHF.
Selectively outputs broadcast television signals. here
When you perform SHF broadcast tuning operation, NAND gate 2
Output 3 becomes low level, and output 2 maintains high level, so switching circuit 4 continues to switch to SHF.
Outputs broadcast signals. While receiving SHF broadcasts,
When a UHF broadcast is selected, the output of the NAND gate 24 becomes low level, so the output 2 is inverted and becomes low level, and the switching circuit 4 outputs a VHF or UHF broadcast television signal instead of the SHF broadcast. do. The following table summarizes the level states of output Q 1 (pin 9) and output Q 2 (pin 13) in each state.
【表】
本装置によれば、優先選択スイツチ22により
電源投入時、いずれの放送波のテレビジヨン信号
を優先して信号処理回路に供給するかを決定する
ことが出来、たとえばSHF放送のみしか受信出
来ない地域においても、このスイツチ22をあら
かじめ固定端子b側に倒しておけば、電源スイツ
チを操作するだけでSHF放送のチヤンネルを映
出することが出来る。そして、チヤンネル選局を
行なつた時は、選局操作にともなつて発生するデ
イフイートパルスに基いて切換回路4を、そのチ
ヤンネルが属する放送波を選択する様に自動的に
切換えて以降の信号処理回路に供給することが出
来、選局操作を行なうだけでテレビジヨン信号の
切換えも可能となり操作が容易となつて、実用上
極めて便利となる。なお第2図において、コンデ
ンサ31,32は誤動作防止用のコンデンサであ
る。
発明の効果
以上の様に、本発明によれば、VHF・UHF放
送とSHF放送のテレビジヨン信号の切換回路を
優先選択スイツチにて制御することにより、電源
投入時に信号処理回路へ供給するテレビジヨン信
号をあらかじめ選択しておくことが出来、たとえ
ばこのスイツチをSHF放送側に倒しておけば、
電源投入動作を行なうだけでSHF放送のテレビ
ジヨン信号を選択して以降の処理回路へ供給する
ことが出来、たとえばSHFしか受信出来ない地
域でも簡単な操作でまずその放送を視聴すること
が可能となるとともに、それ以降は選局操作に伴
つて発生する信号に基いて上記切換回路を自動的
に切換制御することが出来、選局操作によつて信
号切換えも行なえ実用上極めて便利である。[Table] According to this device, when the power is turned on using the priority selection switch 22, it is possible to determine which broadcast wave television signal should be given priority and supplied to the signal processing circuit. For example, only SHF broadcasts can be received. Even in areas where this is not possible, if this switch 22 is set to the fixed terminal B side in advance, the SHF broadcasting channel can be displayed simply by operating the power switch. When a channel is selected, the switching circuit 4 is automatically switched to select the broadcast wave to which the channel belongs based on the daily pulse generated by the channel selection operation. It can be supplied to a signal processing circuit, and it is possible to switch television signals simply by performing a channel selection operation, making the operation easy and extremely convenient in practice. Note that in FIG. 2, capacitors 31 and 32 are capacitors for preventing malfunction. Effects of the Invention As described above, according to the present invention, by controlling the switching circuit for television signals of VHF/UHF broadcasting and SHF broadcasting with a priority selection switch, the television signal that is supplied to the signal processing circuit when the power is turned on is You can select the signal in advance, for example, if you flip this switch to the SHF broadcast side,
Just by turning on the power, you can select the SHF broadcast television signal and supply it to the subsequent processing circuit.For example, even in areas where only SHF can be received, it is possible to watch the broadcast with a simple operation. Furthermore, from then on, the switching circuit can be automatically switched based on the signal generated in response to the channel selection operation, and the signal switching can also be performed by the channel selection operation, which is extremely convenient in practice.
第1図は本発明の信号切換装置が適用される
SHFチユーナを内蔵したテレビジヨン受像機の
ブロツク図、第2図は本発明の一実施例における
信号切換装置の回路図である。
1……VHF・UHFチユーナ、3……SHFチユ
ーナ、4……VHF・UHF/SHF切換回路、21
……制御回路、22……優先選択スイツチ、2
3,24……NANDゲート、27,28,29,
30……ダイオード。
FIG. 1 shows the signal switching device of the present invention applied.
FIG. 2 is a block diagram of a television receiver with a built-in SHF tuner. FIG. 2 is a circuit diagram of a signal switching device according to an embodiment of the present invention. 1...VHF/UHF tuner, 3...SHF tuner, 4...VHF/UHF/SHF switching circuit, 21
...Control circuit, 22...Priority selection switch, 2
3, 24...NAND gate, 27, 28, 29,
30...Diode.
Claims (1)
放送のテレビジヨン信号を入力とし、切換制御信
号が第1の電位の時は上記信号のうちいずれか一
方のテレビジヨン信号を、上記第1の電位とは異
なる第2の電位の時は他方のテレビジヨン信号
を、それぞれ出力する切換回路と、電源投入時に
第1の電位を示す第1の端子に第1の固定端子
を、電源投入時に第2の電位を示す第2の端子に
第2の固定端子を各々接続し、可動端子を上記切
換制御信号の出力端とする優先選択スイツチと、
VHF・UHF放送のチヤンネルを選局した際に発
生する第1の信号と、SHF放送のチヤンネルを
選局した際に発生する第2の信号を入力とし、第
1の信号が入力されると、上記第1、第2の端子
ともに第1の電位を示させ、上記第2の信号が入
力されると、上記第1、第2の端子ともに第2の
電位を示させる制御手段とを備えた信号切換装
置。1 VHF/UHF broadcast television signals and SHF
A broadcast television signal is input, and when the switching control signal is at the first potential, one of the television signals is input, and when the switching control signal is at a second potential different from the first potential, the other one is input. A switching circuit outputs television signals, a first fixed terminal is connected to a first terminal that shows a first potential when the power is turned on, and a second fixed terminal is connected to a second terminal that shows a second potential when the power is turned on. a priority selection switch having fixed terminals connected to each other and a movable terminal serving as an output terminal for the switching control signal;
The first signal generated when selecting a VHF/UHF broadcasting channel and the second signal generated when selecting an SHF broadcasting channel are input, and when the first signal is input, control means for causing both the first and second terminals to exhibit a first potential, and for causing both the first and second terminals to exhibit the second potential when the second signal is input; Signal switching device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12596684A JPH0237141B2 (en) | 1984-06-19 | 1984-06-19 | SHINGOKIRIKAESOCHI |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12596684A JPH0237141B2 (en) | 1984-06-19 | 1984-06-19 | SHINGOKIRIKAESOCHI |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS614329A JPS614329A (en) | 1986-01-10 |
JPH0237141B2 true JPH0237141B2 (en) | 1990-08-22 |
Family
ID=14923381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12596684A Expired - Lifetime JPH0237141B2 (en) | 1984-06-19 | 1984-06-19 | SHINGOKIRIKAESOCHI |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0237141B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63299590A (en) * | 1987-05-29 | 1988-12-07 | Fujitsu General Ltd | Television receiver with built-in satellite broadcasting receiver |
JP2656632B2 (en) * | 1989-10-11 | 1997-09-24 | 株式会社日立製作所 | TV broadcast receiver with automatic RF input switching function |
JPH05161083A (en) * | 1991-12-06 | 1993-06-25 | Sony Corp | Television receiver |
-
1984
- 1984-06-19 JP JP12596684A patent/JPH0237141B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS614329A (en) | 1986-01-10 |
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Legal Events
Date | Code | Title | Description |
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EXPY | Cancellation because of completion of term |