JPH0159792B2 - - Google Patents
Info
- Publication number
- JPH0159792B2 JPH0159792B2 JP57217236A JP21723682A JPH0159792B2 JP H0159792 B2 JPH0159792 B2 JP H0159792B2 JP 57217236 A JP57217236 A JP 57217236A JP 21723682 A JP21723682 A JP 21723682A JP H0159792 B2 JPH0159792 B2 JP H0159792B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- electric field
- output
- mode
- audio
- 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
- 230000005684 electric field Effects 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/607—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for more than one sound signal, e.g. stereo, multilanguages
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は音声多重放送を受信可能で、かつ音声
多重放送の内容を文字あるいは記号等で陰極線管
画面上に表示するようにしたテレビジヨン受像機
に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a television receiver capable of receiving audio multiplex broadcasts and displaying the contents of the audio multiplex broadcasts in characters or symbols on a cathode ray tube screen. .
従来例の構成とその問題点
現在、音声多重放送を受信可能で、かつこの音
声多重放送の内容を文字あるいは記号で陰極線管
画面上に表示するようにしたテレビジヨン受像機
にさらにビデオテープレコーダ、パーソナルコン
ピユータからのおのおのの出力信号を入力する入
力端子を備えるとともに、アンテナから得て復調
処理した映像信号、音声信号をビデオテープレコ
ーダに録画するためにその出力端子を備えたもの
が開発されてきている。したがつて、この種のテ
レビジヨン受像機にあつては、あるチヤンネルの
テレビ番組を視聴しながらそのテレビ番組のビデ
オテープレコーダへの録画もできるという機能を
もつものである。そして、なおかつこの種テレビ
ジヨン受像機において、外部入力端子にビデオテ
ープレコーダあるいはパーソナルコンピユータを
接続しその再生映像信号あるいは文字・図形情報
を映出している場合にも、上記出力端子よりのテ
レビジヨン信号の録画動作も考慮して、テレビジ
ヨン受像機の各回路は全て動作するようにしてい
るが、このため、また音声多重放送の内容を表示
せしめるための回路群（以下オンスクリーン回路
という）の出力端が陰極線管の直前に接続されて
いるため、送られてくる音声多重の内容が、たと
えばモノラルからステレオ放送あるいは二重放送
に変わると前記オンスクリーン回路が働いて、ビ
デオテープレコーダの再生中あるいは文字・図形
情報の映出中にもかかわらず、その内容が陰極線
管画面上に現われてしまう。この結果、視聴者は
あたかも入力信号が変つたかのごとき感じを受け
る。したがつて、ビデオテープレコーダを再生中
であるビデオモード、あるいはパーソナルコンピ
ユータを使用中のRGBモードにおいては、音声
多重放送の内容が変わつてもその旨の表示が出な
いようにすることが望ましい。Conventional configuration and its problems At present, in addition to a television receiver capable of receiving audio multiplex broadcasts and displaying the content of the audio multiplex broadcasts in characters or symbols on a cathode ray tube screen, there is also a video tape recorder. A device has been developed that is equipped with an input terminal for inputting each output signal from a personal computer, and an output terminal for recording the demodulated video and audio signals obtained from the antenna on a video tape recorder. There is. Therefore, this type of television receiver has the function of being able to record a television program on a video tape recorder while viewing a television program on a certain channel. Furthermore, in this type of television receiver, even when a video tape recorder or personal computer is connected to the external input terminal and the reproduced video signal or text/graphic information is displayed, the television signal from the output terminal is Considering the recording operation of the TV receiver, all circuits of the television receiver are operated, but for this reason, the output of the circuit group (hereinafter referred to as on-screen circuit) for displaying the contents of the audio multiplex broadcast is Since the end is connected just before the cathode ray tube, when the content of the multiplexed audio that is being sent changes from monaural to stereo broadcast or double broadcast, the on-screen circuit is activated, and the on-screen circuit is activated during playback on the video tape recorder or Even though text/graphic information is being displayed, the content appears on the cathode ray tube screen. As a result, the viewer feels as if the input signal has changed. Therefore, in the video mode when a video tape recorder is being played back, or in the RGB mode when a personal computer is being used, it is desirable to not display a message to that effect even if the content of the audio multiplex broadcast changes.
発明の目的
本発明はテレビモード時以外においては音声多
重放送の表示を強制的にモノラルモード表示に固
定することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to forcibly fix the display of audio multiplex broadcasting to monaural mode display except in television mode.
発明の構成
本発明は、弱電界時に音声多重放送の内容表示
をモノラルモードに設定する回路を利用して、入
力切換回路をテレビモード時以外に設定したと
き、前記回路を動作せしめて音声多重放送の内容
表示を強制的にモノラルモードにして音声多重放
送の内容が変わろうと音声多重放送の内容表示が
出ないようにしたものである。Structure of the Invention The present invention utilizes a circuit that sets the content display of audio multiplex broadcasting to monaural mode in a weak electric field, and when the input switching circuit is set to a mode other than television mode, the circuit is activated to broadcast audio multiplex broadcasting. The content display of the audio multiplex broadcast is forcibly set to monaural mode so that the content display of the audio multiplex broadcast does not appear even if the content of the audio multiplex broadcast changes.
実施例の説明
以下本発明の一実施例を添付図面を用いて説明
する。図においてアンテナから入つた高周波テレ
ビジヨン信号は選局・映像中間周波増幅回路１で
処理され、さらに映像検波回路２で検波され映像
信号と音声中間周波信号に分離される。映像信号
は次の入力切換回路３を介して映像・色信号処理
回路４に入り、RGB−テレビ切換スイツチ５、
さらに陰極線管駆動回路６を通して陰極線管７に
印加される。一方、音声中間周波信号は音声検波
回路８で検波され音声信号に変換される。この音
声信号は音声多重復調・判別回路９で多重復調、
さらに多重判別される。多重復調された音声信号
は入力切換回路３を通して音量制御回路１０、音
声増幅回路１１で所定のレベルまで増幅され左右
のスピーカ１２，１３に加わる。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In the figure, a high frequency television signal input from an antenna is processed by a channel selection/video intermediate frequency amplification circuit 1, further detected by a video detection circuit 2, and separated into a video signal and an audio intermediate frequency signal. The video signal enters the video/color signal processing circuit 4 via the next input switching circuit 3, and then goes to the RGB-TV selection switch 5,
Further, the voltage is applied to the cathode ray tube 7 through the cathode ray tube drive circuit 6. On the other hand, the audio intermediate frequency signal is detected by the audio detection circuit 8 and converted into an audio signal. This audio signal is multiplex demodulated and demodulated by the audio multiplex demodulation/discrimination circuit 9.
Furthermore, multiple discrimination is performed. The multiplex demodulated audio signal passes through the input switching circuit 3, is amplified to a predetermined level by a volume control circuit 10, and an audio amplification circuit 11, and is applied to left and right speakers 12 and 13.
一方、音声多重復調・判別回路９は、たとえば
モノラル放送のときは5V、ステレオ放送のとき
は2V（Lowレベル）、二重放送のときは8V（High
レベル）と三値状態の出力電圧を他の出力端子に
出力し、さらにもう一つの出力端子に電界に応じ
た直流電圧を出力する。たとえば、この出力直流
電圧は強電界時は1Vで電界強度が弱くなるにつ
れてその値が高くなり、たとえば7Vまで上昇す
る。弱電界判別回路１４は前記音声多重復調・判
別回路９の電界強度に応じた出力直流電圧を入力
とし、たとえばこの直流電圧が5Vになると動作
して、出力端子に5Vの直流電圧を発生する。 On the other hand, the audio multiplex demodulation/discrimination circuit 9 outputs 5V (low level) for monaural broadcasting, 2V (low level) for stereo broadcasting, and 8V (high level) for double broadcasting.
level) and three-value state output voltage are output to another output terminal, and a DC voltage corresponding to the electric field is output to another output terminal. For example, this output DC voltage is 1V when the electric field is strong, and increases as the electric field strength becomes weaker, for example, to 7V. The weak electric field discrimination circuit 14 inputs the output DC voltage corresponding to the electric field strength of the audio multiplex demodulation/discrimination circuit 9, and operates when the DC voltage reaches 5V, for example, to generate a 5V DC voltage at the output terminal.
１５はモード切換制御回路で、音声多重復調・
判別回路９の出力と弱電界判別回路１４の出力を
入力としており、弱電界判別回路１４の出力を優
先的に出力するようにしている。すなわち、本回
路１５はまず弱電界判別回路１４の出力の有無を
判定し出力があればこの出力を電圧比較器１５に
供給し、出力がなければ音声多重復調・判別回路
９の出力を電圧比較器１６に供給するように構成
されている。上記電圧比較器１６は、モード切換
制御回路１５の出力電圧を入力とし、弱電界時以
外は音声多重復調・判別回路９の出力電圧に応じ
た信号を発生する。１７は表示コントロール回路
で、電圧比較器１６の出力信号に応じてモノラ
ル、ステレオ放送、二重放送を示す信号を出力す
る。オンスクリーン制御回路１８はキヤラクタゼ
ネレータを含み、表示コントロール回路１７から
の出力に応じた文字信号を出力し、これを陰極線
管駆動回路６を通して陰極線管７にテレビジヨン
放送による画像と重畳して表示する。前記弱電界
判別回路１４は、弱電界になると雑音成分が大き
く目立つようになり、したがつてステレオ放送受
信時にあると左右のスピーカ１２，１３より雑音
が大きく聞こえるようになつて聞きずらくなるこ
とより設置したものであり、この弱電界判別回路
１４によりモード切換制御回路１５を通して電圧
比較器１６に加わる直流電圧を弱電界時に5Vに
設定することによりテレビジヨン受像機をモノラ
ルモードにして雑音の放音される程度を小さくす
るものである。また、弱電界時では、ステレオ放
送、二重放送を示す制御信号でAM変調した切替
信号の振幅が不安定となり、その結果、切替信号
のないモノラル放送と、切替信号のあるステレオ
放送・二重放送の判別回路９が誤判別をしてしま
い、ステレオ放送あるいは二重放送であるにもか
かわわらず、モノラル放送であるとの判別出力を
出してしまつたり、電界の強弱の変動により、音
声多重放送のオンスクリーン表示が頻繁に変化し
て見苦しくなるという問題がある。弱電界判別回
路１４はこの問題をも解決するものであり、弱電
界になると、5Vの電圧を出力し、以降のオンス
クリーン回路による音声多重放送の内容表示をモ
ノラルモードに固定するものである。したがつ
て、音声多重復調・判別回路９が誤判別をして
も、内容表示は変化することがなく（陰極線管画
面に表われることはなく）、画面の見苦しさはな
くなるものである。また１９はビデオテープレコ
ーダからの再生映像信号が加わる入力端子（以下
ビデオ入力端子と呼ぶ）、２０はパーソナルコン
ピユータからの文字・図形情報が印加される入力
端子（以下RGB入力端子と呼ぶ）である。 15 is a mode switching control circuit, which performs audio multiplex demodulation and
The output of the discrimination circuit 9 and the output of the weak electric field discrimination circuit 14 are input, and the output of the weak electric field discrimination circuit 14 is output preferentially. That is, this circuit 15 first determines whether there is an output from the weak electric field discrimination circuit 14, and if there is an output, it supplies this output to the voltage comparator 15, and if there is no output, it compares the output of the audio multiplex demodulation/discrimination circuit 9 with voltage. 16. The voltage comparator 16 receives the output voltage of the mode switching control circuit 15 as an input, and generates a signal corresponding to the output voltage of the audio multiplex demodulation/discrimination circuit 9 except when the electric field is weak. Reference numeral 17 denotes a display control circuit which outputs a signal indicating monaural, stereo broadcast, or dual broadcast according to the output signal of the voltage comparator 16. The on-screen control circuit 18 includes a character generator, outputs a character signal according to the output from the display control circuit 17, and displays this on the cathode ray tube 7 through the cathode ray tube drive circuit 6 by superimposing it on a television broadcast image. do. The weak electric field discrimination circuit 14 has a problem in that when the electric field becomes weak, noise components become more noticeable, and therefore, when receiving a stereo broadcast, the noise becomes louder than the left and right speakers 12 and 13, making it difficult to hear. This weak electric field discrimination circuit 14 sets the DC voltage applied to the voltage comparator 16 through the mode switching control circuit 15 to 5V in the case of a weak electric field, thereby setting the television receiver to monaural mode and eliminating noise. This reduces the amount of sound that is heard. In addition, in a weak electric field, the amplitude of the switching signal modulated by AM with the control signal indicating stereo broadcasting or duplex broadcasting becomes unstable, resulting in monaural broadcasting without a switching signal and stereo broadcasting/duplex broadcasting with a switching signal. The broadcast discrimination circuit 9 may make a misjudgment and output a monaural broadcast even though it is a stereo broadcast or a double broadcast, or due to fluctuations in the strength of the electric field, the audio There is a problem in that the on-screen display of multiplex broadcasts changes frequently and becomes unsightly. The weak electric field discrimination circuit 14 also solves this problem, and when the electric field becomes weak, it outputs a voltage of 5V and fixes the content display of the audio multiplex broadcast by the subsequent on-screen circuit to monaural mode. Therefore, even if the audio multiplex demodulation/discrimination circuit 9 makes a misjudgment, the content display will not change (it will not appear on the cathode ray tube screen), and the screen will no longer be unsightly. Further, 19 is an input terminal to which a reproduced video signal from a video tape recorder is applied (hereinafter referred to as a video input terminal), and 20 is an input terminal to which text/graphic information from a personal computer is applied (hereinafter referred to as an RGB input terminal). .
上記構成において入力切換回路３をテレビモー
ドにしておくとスイツチ５は映像・色信号処理回
路４と接続され、陰極線管７にはテレビジヨン放
送による画像が表示される。一方、強電界である
と音声多重復調・判別回路９からモード切換制御
回路１５電圧比較器１６、表示コントロール回路
１７、オンスクリーン制御回路１８よりなるオン
スクリーン回路の働らきにより陰極線管７に音声
多重放送の内容が正しく、一定時間、文字あるい
は記号で表示される。 In the above configuration, when the input switching circuit 3 is set to the television mode, the switch 5 is connected to the video/color signal processing circuit 4, and the cathode ray tube 7 displays images from television broadcasting. On the other hand, in the case of a strong electric field, the sound is multiplexed from the sound multiplexing demodulation/discrimination circuit 9 to the cathode ray tube 7 by the function of the on-screen circuit consisting of the mode switching control circuit 15, the voltage comparator 16, the display control circuit 17, and the on-screen control circuit 18. The content of the broadcast is correct and displayed in text or symbols for a certain period of time.
一方、入力切換回路３によりビデオモード、あ
るいはRGBモード（このときスイツチ５はRGB
端子２０側に切換わる）に設定したとき、図に示
す各回路はすべて働いているため、このとき送ら
れてくる音声多重放送の内容が変わるとオンスク
リーン回路が働いて画面にその旨の表示がなされ
る。そこで本発明においては図に示すようにテレ
ビモード時はオープン状態、それ以外のモード
（ビデオモード、RGBモード）時は、たとえば
12Vの直流電圧が加わる入力切換回路３の端子と
弱電界判別回路１４の入力端子との間に逆流防止
用ダイオード２１と電圧調整用の抵抗２２との直
列回路を挿入し、ビデオモード時およびRGBモ
ード時、12Vの電圧を前記直列回路を通してたと
えば7Vに降圧して弱電界判別回路１４の入力端
子に加え、弱電界時と同様に回路を設定するもの
である。すなわち、モード切換制御回路１５によ
り弱電界モードが優先されることより、モード切
換制御回路１５からは5Vが出力され電圧比較器
１６に印加される。したがつてオンスクリーン回
路はモノラルモードに固定され、以降音声多重放
送の内容が変つてもその旨の表示が陰極線管７に
表示されることはない。なお、ダイオード２１は
音声多重復調・判別回路９の出力端側をカソード
としているため、弱電界時以外の出力電圧が入力
切換回路３に悪影響を与えることはない。 On the other hand, input switching circuit 3 selects video mode or RGB mode (at this time, switch 5
When set to terminal 20), all the circuits shown in the figure are working, so if the content of the audio multiplex broadcast that is being sent at this time changes, the on-screen circuit will work and a message to that effect will be displayed on the screen. will be done. Therefore, in the present invention, as shown in the figure, it is in an open state in TV mode, and in other modes (video mode, RGB mode), for example.
A series circuit consisting of a backflow prevention diode 21 and a voltage adjustment resistor 22 is inserted between the terminal of the input switching circuit 3 to which 12V DC voltage is applied and the input terminal of the weak electric field discrimination circuit 14. In the mode, a voltage of 12V is stepped down to, for example, 7V through the series circuit and applied to the input terminal of the weak electric field discriminating circuit 14, and the circuit is set in the same manner as in the case of a weak electric field. That is, since the mode switching control circuit 15 gives priority to the weak electric field mode, 5V is output from the mode switching control circuit 15 and applied to the voltage comparator 16. Therefore, the on-screen circuit is fixed to the monaural mode, and even if the content of the audio multiplex broadcast changes thereafter, no indication to that effect will be displayed on the cathode ray tube 7. Note that since the diode 21 has the output end side of the audio multiplexing demodulation/discrimination circuit 9 as its cathode, the output voltage other than when the electric field is weak does not adversely affect the input switching circuit 3.
発明の効果
以上のように本発明によれば、テレビモード以
外は音声多重放送の内容表示を強制的にモノラル
に設定することにより、たとえ音声多重放送の内
容が変つてもその旨の表示が陰極線管になされる
ことはなく、視聴者が誤認することはない。Effects of the Invention As described above, according to the present invention, by forcibly setting the content display of the audio multiplex broadcast to monaural in modes other than TV mode, even if the content of the audio multiplex broadcast changes, the display to that effect will be displayed on the cathode ray. It will not be used as a tube, and the viewer will not be misled.
図は本発明の一実施例におけるテレビジヨン受
像機のブロツク図である。
１……選局・VIF回路、２……映像検波回路、
３……入力切換回路、４……映像・色信号処理回
路、５……スイツチ、６……陰極線駆動回路、７
……陰極線管、８……音声検波回路、９……音声
多重復調・判別回路、１４……弱電界判別回路、
１５……モード切換制御回路、１６……電圧比較
器、１７……表示コントロール回路、１８……オ
ンスクリーン制御回路、１９……ビデオ端子、２
０……RGB端子、２１……ダイオード、２２…
…抵抗。
The figure is a block diagram of a television receiver in one embodiment of the present invention. 1...Tuition selection/VIF circuit, 2...Video detection circuit,
3...Input switching circuit, 4...Video/color signal processing circuit, 5...Switch, 6...Cathode ray drive circuit, 7
...Cathode ray tube, 8...Audio detection circuit, 9...Audio multiplex demodulation/discrimination circuit, 14...Weak electric field discrimination circuit,
15...Mode switching control circuit, 16...Voltage comparator, 17...Display control circuit, 18...On-screen control circuit, 19...Video terminal, 2
0...RGB terminal, 21...diode, 22...
…resistance.
Claims (1)
字あるいは記号等で陰極線管画面に表示するオン
スクリーン表示手段と、外部信号源からの映像情
報とテレビジヨン信号を切換えて陰極線管に供給
する切換手段と、弱電界時、前記オンスクリーン
表示手段をモノラルモードに固定するように制御
する弱電界判別手段と、前記切換手段によつて外
部信号源が選択されるとその検出出力によつて前
記弱電界判別手段を駆動し、前記オンスクリーン
表示手段をモノラルモードに固定するように制御
する手段とを備えるテレビジヨン受像機。1 On-screen display means for determining the content of audio multiplex broadcasting and displaying the content in characters or symbols on the cathode ray tube screen, and a switch for switching video information and television signals from an external signal source and supplying the same to the cathode ray tube. a weak electric field determining means for controlling the on-screen display means to be fixed in monaural mode when the electric field is weak; and when an external signal source is selected by the switching means, the detection output determines the A television receiver comprising means for driving an electric field determining means and controlling the on-screen display means to fix it in a monaural mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57217236A JPS59126381A (en) | 1982-12-10 | 1982-12-10 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57217236A JPS59126381A (en) | 1982-12-10 | 1982-12-10 | Television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59126381A JPS59126381A (en) | 1984-07-20 |
| JPH0159792B2 true JPH0159792B2 (en) | 1989-12-19 |
Family
ID=16700979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57217236A Granted JPS59126381A (en) | 1982-12-10 | 1982-12-10 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59126381A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61292483A (en) * | 1985-06-20 | 1986-12-23 | Pioneer Electronic Corp | Sound multiplex demodulating circuit |
| JP2981046B2 (en) * | 1992-01-24 | 1999-11-22 | 株式会社日立製作所 | Audio multiplex broadcasting receiver |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57188184A (en) * | 1981-05-14 | 1982-11-19 | Sharp Corp | Television receiver |
-
1982
- 1982-12-10 JP JP57217236A patent/JPS59126381A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59126381A (en) | 1984-07-20 |
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