JPS6041330A - Television receiver - Google Patents
Television receiverInfo
- Publication number
- JPS6041330A JPS6041330A JP14276584A JP14276584A JPS6041330A JP S6041330 A JPS6041330 A JP S6041330A JP 14276584 A JP14276584 A JP 14276584A JP 14276584 A JP14276584 A JP 14276584A JP S6041330 A JPS6041330 A JP S6041330A
- Authority
- JP
- Japan
- Prior art keywords
- tuner
- circuits
- channels
- diodes
- channel
- 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
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
- H03J5/244—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 using electronic means
Landscapes
- Noise Elimination (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、テレビジョン受像機における特にアンテナ入
力部分の構成に関し、隣接チャンネル妨害や相互変調あ
るいは混変調等によるビート妨害やワイパー現象等の悪
影響を受けることのないものを提供することを目的とす
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of the antenna input part of a television receiver, in particular, to a television receiver that is free from adverse effects such as beat interference and wiper phenomena due to adjacent channel interference, intermodulation, and cross-modulation. The purpose is to provide
以下、本発明につき、その一実施例を示す図面を参照し
て詳細に説明する。EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment thereof.
図において、１はアンテナで受信された信号が入力され
るアンテナ入力端子、２はチューナの信号入力端子、３
ａ〜３にはチューナにおけるチャンネル選局用のスイッ
チ、４ａ〜４にはチューナにおいて各チャンネルに同調
させるために可変容量ダイオードに印加すべき選局用電
圧を設定する可変抵抗器で、これらは公知のものである
。In the figure, 1 is an antenna input terminal into which a signal received by the antenna is input, 2 is a tuner signal input terminal, and 3 is a tuner signal input terminal.
A to 3 are switches for channel selection in the tuner, and 4a to 4 are variable resistors for setting the tuning voltage to be applied to the variable capacitance diode in order to tune to each channel in the tuner, and these are known. belongs to.
一方、５ａ、５ｂ、・・・・・・６１はそれぞれａチャ
しネル、ｂチャンネル、・・・・・ｉチャンネルのそれ
ぞれの１チャンネル分の信号のみを通過させ、特に下側
隣接チャンネルの音声搬送周波数および上側隣接チャン
ネルの映像搬送波周波数を有効に阻止するように設定し
たトラップ回路で、それぞれのトラップ回路６ａ〜５主
には入力側と出力側とにそれぞれ電子的スイッチング素
子として電極間容量の小さいスイッチングダイオード６
ａ〜６１と７ａ〜７１とを２個づつ直列にして接続し、
それらの直列回路を並列にしてアンテナ入力端子１とチ
ューナの入力端子２との間に接続している。On the other hand, 5a, 5b, . . . 61 respectively pass only one channel's worth of signals of the a channel, b channel, . . . i channel, and especially the audio of the lower adjacent channel. This trap circuit is set to effectively block the carrier frequency and the video carrier frequency of the upper adjacent channel, and each of the trap circuits 6a to 5 mainly has an interelectrode capacitance as an electronic switching element on the input side and the output side, respectively. small switching diode 6
Connect two of a~61 and 7a~71 in series,
These series circuits are connected in parallel between the antenna input terminal 1 and the input terminal 2 of the tuner.
これらトラップ回路５ａ〜５１は上述のような妨害を受
けるおそれのある３ａ〜１チヤンネルについて設け、そ
れ以外のＪ、にチャンネル用には単に結合用コンデンサ
８とスイッチングダイオード９，１ｏとの直列回路を接
続している。１１〜１４は結合用のコンデンサである。These trap circuits 5a to 51 are provided for channels 3a to 1 that are likely to receive interference as described above, and for the other channels, a series circuit consisting of a coupling capacitor 8 and switching diodes 9 and 1o is simply provided. Connected. 11 to 14 are coupling capacitors.
そして、スイッチングダイオード６ａ〜６１７ａ〜７ｉ
、９．１０のそれぞれの一端は抵抗１５〜１８を介して
２０Ｖの電源端子１９に接続し、ａ、ｂ、・・・・１チ
ヤンネル用のスイッチングダイオード６ａ〜６１．７ａ
〜７１の他端はそれぞれ抵抗２０ ａ 〜２０ｉ、２１
ａ 〜２１ｉを介してそれぞれ’ Ｔ ｂ＋・・・・１
チヤンネル用の選局スイッチ３ａ〜３１に接続し、コ
、にチャンネル用のスイッチングダイオード９，１０の
他端は抵抗２２ 、２３とダイオード２４２Ｌ〜２４１
を介して選局スイッチ３ａ〜３１に接続するとともに抵
抗２５．２６を介して１２Ｖの電源端子２７に接続して
いる。And switching diodes 6a to 617a to 7i
, 9.10 are connected to a 20V power supply terminal 19 via resistors 15 to 18, and switching diodes 6a to 61.7a for channels a, b, . . .
The other ends of ~71 are resistors 20a ~20i, 21, respectively.
a to 21i respectively' T b+...1
Connect to the channel selection switches 3a to 31, and
, the other ends of the switching diodes 9 and 10 for channels are connected to resistors 22 and 23 and diodes 242L to 241.
It is connected to the channel selection switches 3a to 31 via resistors 25 and 26, and to a 12V power supply terminal 27 via resistors 25 and 26.
このような構成により、今、ａ〜１チャンネルのうちの
いずれかのチャンネル、たとえばｂチャンネル、を選局
すると、選局スイッチ３ｂのみが閉じられ、可変抵抗器
４ｂ’に電流が流され、ここで設定されている選局用電
圧がチューナに加えられてｂチャンネルが選択される。With such a configuration, when one of the channels a to 1, for example channel b, is selected, only the channel selection switch 3b is closed, current is passed through the variable resistor 4b', and the current is passed through the variable resistor 4b'. The channel selection voltage set in is applied to the tuner to select the b channel.
そして、このときにはスイッチングダイオード６ｂ、７
ｂのみが順方向にバイアスされて導通し、他のスイッチ
ングダイオードｅａ、６ｉ、７ａ、７ｉは全て逆バイア
スになって遮断状態になる。寸だ、スイッチングダイオ
ード２４ｂが導通して、スイッチングダイオード９，１
０，２４１Ｌ 、２４ｉも遮断状態になる。At this time, the switching diodes 6b and 7
Only switching diode b is forward biased and conductive, and the other switching diodes ea, 6i, 7a, and 7i are all reverse biased and cut off. The switching diode 24b becomes conductive, and the switching diodes 9 and 1
0,241L and 24i are also cut off.
その結果、ｂチャンネル用のトラップ回路５ｂのみが動
作可能になり、他のトラップ回路６２Ｌ。As a result, only the trap circuit 5b for the b channel becomes operational, and the other trap circuits 62L.
６１およびコンデンサ８等は開放されることとなって、
受信されたｂチャンネルの信号のみがアンテナ入力端子
１からスイッチングダイオード６ｂ。61 and capacitor 8 etc. are to be opened,
Only the received b-channel signal is transferred from the antenna input terminal 1 to the switching diode 6b.
ｌ・ラップ回路６ｂ、スイッチングダイオード７ｂを介
してチューナの入力端子２に供給される。これにより、
他の周波数による不要な信号がチューナに加えられるこ
とがなくなって、隣接チャンネル妨害によるビート妨害
やワイパー現象の生じるおそれがなくなり、甘だ相互変
調や混変調による悪影響も発生しなくなる。The signal is supplied to the input terminal 2 of the tuner via the l-wrap circuit 6b and the switching diode 7b. This results in
Unnecessary signals from other frequencies are no longer added to the tuner, so there is no possibility of beat interference or wiper phenomena due to adjacent channel interference, and no adverse effects due to loose intermodulation or cross modulation occur.
なお、かかる妨害や悪影響の生じるおそれのないｊ、に
チャンネルが選局スイッチ３ｊ、３ｋによって選択され
たときには、スイッチングダイオード２４ａ〜２４１が
全て遮断状態になって、スイッチングダイオード９，１
０が導通し、大刀信号はそのままチューナの入力端子２
に加えられる。Note that when the channel selection switch 3j, 3k selects channel j, which is unlikely to cause such interference or adverse effects, the switching diodes 24a to 241 are all cut off, and the switching diodes 9, 1
0 is conductive, and the long sword signal remains as it is at input terminal 2 of the tuner.
added to.
このように本発明によれば、アンテナから加えられる所
望の選局チャンネル以外の周波数の不要信号をチューナ
に加えないようにすることができて、各種の妨害や悪影
響を排除することのできる実用的効果の大きいテレビジ
ョン受像機を得ることができるものである。As described above, according to the present invention, unnecessary signals of frequencies other than the desired selected channel applied from the antenna can be prevented from being applied to the tuner, and various interferences and adverse effects can be eliminated. This makes it possible to obtain a television receiver with great effects.
図は本発明の一実施例におけるテレビジョン受像機の回
路図である。
１−・・・アンテナ入力端子、２・・・・・チューナの
入力端子、３ａ〜３ｋ・・−・・・選局スイッチ、６ａ
〜５１・・・ ・トラップ回路、６ａ〜６ｉ、７ａ〜７
１・・・・・・スイッチングダイオード、１５，１６，
２０２Ｌ〜２ｏｉ 、２１ ａ〜２１１・・・・・抵抗
。The figure is a circuit diagram of a television receiver according to an embodiment of the present invention. 1-... Antenna input terminal, 2... Tuner input terminal, 3a to 3k... Tuning switch, 6a
~51... ・Trap circuit, 6a~6i, 7a~7
1...Switching diode, 15, 16,
202L~2oi, 21a~211...Resistance.
Claims (1)
ぞれのチャンネルの信号のみを通過させるトラップ回路
と電子的スイッチング素子との直列回路を複数チャンネ
ル分並列にして設け、上記チューナにおける選局チャン
ネルの選択と連動してその選択されたチャンネル用のト
ラップ回路のみを動作させるように上記電子的スイッチ
ング素子をスイッチング制御するようにしてなるテレビ
ジョン受像機。Between the antenna input terminal and the input terminal of the tuner, a series circuit of a trap circuit and an electronic switching element for passing only the signal of each channel is provided in parallel for a plurality of channels, and the selection of the selected channel in the tuner is performed. The television receiver is configured to control the switching of the electronic switching element so as to operate only the trap circuit for the selected channel in conjunction with the television receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14276584A JPS6041330A (en) | 1984-07-10 | 1984-07-10 | Television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14276584A JPS6041330A (en) | 1984-07-10 | 1984-07-10 | Television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6041330A true JPS6041330A (en) | 1985-03-05 |
| JPS63971B2 JPS63971B2 (en) | 1988-01-09 |
Family
ID=15323061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14276584A Granted JPS6041330A (en) | 1984-07-10 | 1984-07-10 | Television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6041330A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62286768A (en) * | 1986-06-06 | 1987-12-12 | Futaba Corp | Light source for printer |
| WO2000014872A1 (en) * | 1998-09-02 | 2000-03-16 | Robert Bosch Gmbh | Radio receiver equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5279001U (en) * | 1975-12-11 | 1977-06-13 | ||
| JPS534738U (en) * | 1976-06-30 | 1978-01-17 |
-
1984
- 1984-07-10 JP JP14276584A patent/JPS6041330A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5279001U (en) * | 1975-12-11 | 1977-06-13 | ||
| JPS534738U (en) * | 1976-06-30 | 1978-01-17 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62286768A (en) * | 1986-06-06 | 1987-12-12 | Futaba Corp | Light source for printer |
| WO2000014872A1 (en) * | 1998-09-02 | 2000-03-16 | Robert Bosch Gmbh | Radio receiver equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63971B2 (en) | 1988-01-09 |
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