JPH0153524B2 - - Google Patents
Info
- Publication number
- JPH0153524B2 JPH0153524B2 JP545882A JP545882A JPH0153524B2 JP H0153524 B2 JPH0153524 B2 JP H0153524B2 JP 545882 A JP545882 A JP 545882A JP 545882 A JP545882 A JP 545882A JP H0153524 B2 JPH0153524 B2 JP H0153524B2
- Authority
- JP
- Japan
- Prior art keywords
- sliding ring
- resistor
- intermediate tap
- sliding
- voltage
- 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
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
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
【発明の詳細な説明】
本発明は、テレビ受像機等の受信機における同
調電圧発生回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning voltage generation circuit in a receiver such as a television receiver.
テレビ受像機の電子チユーナは、同調用可変素
子としてバラクタ・ダイオードが使用されるが、
１個のバラクタ・ダイオードでチヤンネル１〜６
２全てをカバーすることはできないので、VHF
ローチヤンネルVL１〜３，VHFハイチヤンネル
VH４〜１２，UHF全チヤンネル１３〜６２の３
バンドに分けて、各バンド毎に同調回路のコイ
ル、VHF，UHFチユーナのＢ電圧その他を切換
えている。 Electronic tuners in television receivers use varactor diodes as variable tuning elements.
Channels 1 to 6 with one varactor diode
2. Since it is not possible to cover everything, VHF
Roach Channel V L 1~3, VHF Haitian Channel
V H 4-12, UHF all channels 13-62 3
It is divided into bands, and the tuning circuit coil, VHF/UHF tuner B voltage, etc. are switched for each band.
そして、プリセツト時には、可変抵抗器により
プリセツト電圧を発生させ、そのプリセツト電圧
に応じて他の回路により各バンドの同調電圧を発
生させて、プリセツトが行なわれるようになつて
いる。すなわち、第１図ａに示すように、選局チ
ヤンネルに対して可変抵抗で変化するプリセツト
電圧を設定して、そのプリセツト電圧に応じてバ
ンドを割当てて、第１図ｂに示すように各バンド
毎に同様な範囲で変化する同調電圧が得られるよ
うにし、１個の同調回路に２個以上のバラクタ・
ダイオードが必要ないようになつている。 At the time of presetting, a variable resistor generates a preset voltage, and another circuit generates a tuning voltage for each band in accordance with the preset voltage, thereby performing the presetting. That is, as shown in Fig. 1a, a preset voltage that changes with a variable resistor is set for the selected channel, and bands are assigned according to the preset voltage, and each band is set as shown in Fig. 1b. In order to obtain a tuning voltage that changes in the same range for each tuning circuit, two or more varactors are used in one tuning circuit.
Diodes are no longer needed.
しかしながら、従来では、可変抵抗で一担得た
プリセツト電圧を更に処理して各バンドの同調電
圧を発生させる方式であるため、回路が複雑化す
ると共にコスト高になるという問題があつた。 However, in the conventional method, the preset voltage, which is once handled by a variable resistor, is further processed to generate tuning voltages for each band, which has resulted in problems of complicated circuits and high costs.
本発明は斯る点に鑑みて成されたものであり、
その目的は、可変抵抗によつて直接複数のバンド
の同調電圧が得られるようにして、極めて簡単で
コスト的にも有利となる同調電圧発生回路を提供
することである。 The present invention has been made in view of these points,
The purpose is to provide a tuning voltage generation circuit which is extremely simple and cost-effective by directly obtaining tuning voltages of a plurality of bands using a variable resistor.
以下、本発明を実施例によつて説明する。第２
図はその原理を示す図であり、摺動接点１aを有
する可変抵抗器１の一端１bに電圧V0を与え、他
端１cを電圧Ｅ（＜V0）（例えば零ボルト）とし、
中間タツプ１dを設けて、この中間タツプ１dと一
端１bとの間にスイツチ２を、また他端１cとの間
にスイツチ３を接続したものである。 Hereinafter, the present invention will be explained with reference to Examples. Second
The figure is a diagram showing the principle. A voltage V 0 is applied to one end 1 b of a variable resistor 1 having a sliding contact 1 a , and a voltage E (<V 0 ) (for example, zero volts) is applied to the other end 1 c . ,
An intermediate tap 1d is provided, a switch 2 is connected between the intermediate tap 1d and one end 1b , and a switch 3 is connected between the intermediate tap 1d and the other end 1c .
この回路においては、スイツチ２，３共にオフ
となつている場合には、可変抵抗器１の摺動接点
１aを摺動させるとそこから得られる電圧Vaは、
第３図ａに示すようにＥとV0の間を変化するよ
うになる。一方、スイツチ２のみをオンすれば中
間タツプ１dの電圧がV0となるので、その中間タ
ツプ１dと他端１cの間Ａを摺動接点１aを摺動さ
せれば第３図ｂのＡに示すようにやはりＥとV0
の間を変化する電圧が得られ、またスイツチ３の
みをオンにすれば中間タツプ１dの電圧がＥとな
るので、その中間タツプ１dと一端１bの間Ｂを摺
動接点１aを摺動させれば第３図ｂのＢに示すよ
うにやはりＥとV0の間を変化する電圧が得られ
る。すなわち、摺動接点１aが中間タツプ１dから
一端１b側にあるか、他端１c側になるかによつて
スイツチ２，３をオン・オフすれば、第３図ｂに
示す特性の電圧が得られる。 In this circuit, when both switches 2 and 3 are off, the voltage V a obtained by sliding the sliding contact 1 a of the variable resistor 1 is
As shown in FIG. 3a, it changes between E and V 0 . On the other hand, if only the switch 2 is turned on, the voltage at the intermediate tap 1d becomes V0 , so if the sliding contact 1a is slid between the intermediate tap 1d and the other end 1c , as shown in Fig. 3. As shown in A of b, E and V 0
If only the switch 3 is turned on, the voltage at the intermediate tap 1d becomes E, so the sliding contact 1a is connected between the intermediate tap 1d and one end 1b . By sliding, a voltage varying between E and V 0 is also obtained, as shown in FIG. 3b (B). That is, if the switches 2 and 3 are turned on and off depending on whether the sliding contact 1a is on the one end 1b side or the other end 1c side from the intermediate tap 1d , the characteristics shown in Fig. 3b will be obtained. voltage can be obtained.
従つて、スイツチ２，３が共にオフの場合を
UHF、スイツチ２のみがオンの場合をVL、スイ
ツチ３のみがオンの場合をVHのバンドとした同
調電圧Vaを摺動接点１aから得ることができ、第
３図ｃに示すようにこの同調電圧Vaはいずれも
ＥとV0の間を変化する。 Therefore, if both switches 2 and 3 are off,
UHF, the tuning voltage V a with the band V L when only switch 2 is on and V H when only switch 3 is on can be obtained from the sliding contact 1 a , as shown in Figure 3 c. Both tuning voltages V a vary between E and V 0 .
第４図は具体的な実施例の可変抵抗器４を示す
ものであり、両端分離のほぼリング状の抵抗体４
ａの内側にエンドレスの第１摺動リング４bを設け
て、第１摺動接点４cがその第１摺動リング４bと
抵抗体４aを摺動可能となし、最外側にエンドレ
スの第２摺動リング４dを設けて抵抗体４aの中間
タツプ４a1を接続し、第２摺動リング４dと抵抗
体４aの間に、抵抗体４aの中間タツプ４a1および
両端近くで分割した円弧状の第３摺動リング４e
と第４摺動リング４fを設けて、上記第１摺動接
点４cと180度の角度間隔で設けられて連動する第
２摺動接点４gが、第２摺動リング４dと第３摺動
リング４e又は第４摺動リング４fに摺接するよう
にし、第１摺動リング４bを端子４hに、抵抗体４
ａの一端と第３摺動リング４eを端子４iに、更に、
抵抗体４aの他端と第４摺動リング４fを端子４jに
各々接続したものである。 FIG. 4 shows a specific example of a variable resistor 4, in which a substantially ring-shaped resistor 4 with both ends separated is shown.
An endless first sliding ring 4b is provided inside a , the first sliding contact 4c can slide between the first sliding ring 4b and the resistor 4a , and an endless first sliding ring 4b is provided on the outermost side. A second sliding ring 4d is provided to connect the intermediate tap 4a1 of the resistor 4a , and between the second sliding ring 4d and the resistor 4a , the intermediate tap 4a1 of the resistor 4a and both ends are connected. Arc-shaped third sliding ring 4 e divided nearby
and a fourth sliding ring 4f are provided, and a second sliding contact 4g that is provided at an angular interval of 180 degrees and interlocks with the first sliding contact 4c is interlocked with the second sliding ring 4d . 3 sliding ring 4 e or fourth sliding ring 4 f , first sliding ring 4 b to terminal 4 h , resistor 4
one end of a and the third sliding ring 4 e to the terminal 4 i , and
The other end of the resistor 4a and the fourth sliding ring 4f are connected to a terminal 4j , respectively.
この実施例においては、端子４jに電圧V0を加
え、端子４iに電圧Ｅを加えれば、端子４hから同
調電圧VTが得られる。すなわち、第１摺動接点
４cが抵抗体４aの中間タツプ４a1と端子４iとの間
Ａにある場合には、第２摺動接点４gが第２摺動
リング４dと第４摺動リング４fを短絡するので、
中間タツプ４a1の電圧がV0となり、第１摺動接点
４cをＡの範囲で変化させれば、端子４hにはＥと
V0の間で変化する同調電圧VTが得られる。 In this embodiment, if a voltage V 0 is applied to the terminal 4 j and a voltage E is applied to the terminal 4 i , a tuning voltage V T is obtained from the terminal 4 h . That is, when the first sliding contact 4c is located at A between the intermediate tap 4a1 of the resistor 4a and the terminal 4i , the second sliding contact 4g is located between the second sliding ring 4d and the terminal 4i . 4 Sliding ring 4 f is shorted, so
If the voltage at intermediate tap 4 a1 becomes V 0 and the first sliding contact 4 c is varied within the range of A, terminal 4 h will have E and E.
A tuning voltage V T varying between V 0 is obtained.
一方、第１摺動接点４cが中間タツプ４a1と端
子４jとの間Ｂにある場合には、第２摺動接点４g
が第２摺動リング４dと第３摺動リング４eを短絡
するので、中間タツプ４a1の電圧がＥとなり、第
１摺動接点４cをＢの範囲で変化させれば、端子
４hにはやはりＥとV0の間で変化する同調電圧VT
が得られる。 On the other hand, when the first sliding contact 4 c is located at B between the intermediate tap 4 a1 and the terminal 4 j , the second sliding contact 4 g
short-circuits the second sliding ring 4d and the third sliding ring 4e , the voltage at the intermediate tap 4a1 becomes E, and if the voltage at the first sliding contact 4c is varied within the range B, the voltage at the terminal 4 h also has a tuning voltage V T that varies between E and V 0
is obtained.
以上のように、第４図に示した回路では、第１
摺動接点４cが抵抗体４aの中間タツプ４a1からい
ずれの側にあるかによつて、その中間タツプ４a1
の電圧が自動的に、V0又はＥに変るので、２個
のバンド（VH，VL）の同調電圧をその第１摺動
接点４cから得ることができる。 As described above, in the circuit shown in FIG.
Depending on which side of the intermediate tap 4 a1 the sliding contact 4 c is on the resistor 4 a , the intermediate tap 4 a1
automatically changes to V 0 or E, so that the tuning voltage of the two bands (V H , V L ) can be obtained from its first sliding contact 4 c .
なお、３バンド（VL，VH，UHF）の同調電圧
を得ることができるようにするためには、抵抗体
４aの中間タツプ４a1と第２摺動リング４dとの間
にスイツチを介在させ、UHFバンド選択時にそ
のスイツチをオフするようにすれば良い。 In addition, in order to obtain the tuning voltage of three bands (V L , V H , UHF), a switch is connected between the intermediate tap 4 a1 of the resistor 4 a and the second sliding ring 4 d . It would be better to intervene and turn off the switch when selecting the UHF band.
以上のように本発明によれば、可変抵抗器によ
つて直接複数バンドの同調電圧を得ることができ
るようになり、従来のようにプリセツト電圧を複
数バンドの同調電圧に変換する必要がないので、
回路が簡単となり、コスト的に極めて有利となる
という特徴がある。 As described above, according to the present invention, it is possible to directly obtain tuning voltages of multiple bands using a variable resistor, and there is no need to convert preset voltages into tuning voltages of multiple bands as in the past. ,
It has the characteristics that the circuit is simple and extremely cost-effective.
第１図ａは従来のテレビ受像機のチユーナの選
局チヤンネルとプリセツト電圧の特性図、ｂはプ
リセツト電圧と同調電圧の特性図、第２図は本発
明の原理説明用の回路図、第３図ａは第２図のス
イツチ２，３オフの時の摺動接点電圧の特性図、
ｂはスイツチ２，３をオン・オフさせた場合の同
特性図、ｃは同調電圧特性図、第４図は本発明の
一実施例の可変抵抗器の説明図である。
Fig. 1a is a characteristic diagram of the tuning channel and preset voltage of a tuner of a conventional television receiver, b is a characteristic diagram of the preset voltage and tuning voltage, Fig. 2 is a circuit diagram for explaining the principle of the present invention, and Fig. 3 Figure a is a characteristic diagram of the sliding contact voltage when switches 2 and 3 in Figure 2 are off,
b is the same characteristic diagram when switches 2 and 3 are turned on and off, c is a tuning voltage characteristic diagram, and FIG. 4 is an explanatory diagram of a variable resistor according to an embodiment of the present invention.
Claims (1)
調電圧を発生する回路において、 エンドレスの第１摺動リングと、中間タツプに
よつて第１範囲と第２範囲に分割され且つ上記第
１摺動リングに第１摺動接点によつて接続される
両端分離のほぼリング状の抵抗体と、該抵抗体の
中間タツプが接続されるエンドレスの第２摺動リ
ングと、上記抵抗体の中間タツプから一端部にま
で対応して伸びると共に該一端部に接続される円
弧状の第３摺動リングと、上記中間タツプから他
端部にまで対応して伸びると共に該他端部に接続
される円弧状の第４摺動リングと、上記第２摺動
リングと上記第３又は第４摺動リングに接する第
２摺動接点を具備し、 上記第１乃至第４摺動リング及び上記抵抗体を
同軸的に配置すると共に、上記第１摺動接点が上
記抵抗体の第１範囲又は第２範囲の一方に摺動す
る際に上記第２摺動接点を上記抵抗体の第１範囲
又は第２範囲の他方に対応する第３摺動リング又
は第４摺動リングに接するようにしたことを特徴
とする同調電圧発生回路。 ２ 上記第２摺動リングをスイツチを介して上記
抵抗体の中間タツプに接続して成ることを特徴と
する特許請求の範囲第１項記載の同調電圧発生回
路。[Scope of Claims] 1. A circuit for generating a tuning voltage to be applied to a varactor diode of a tuning circuit, comprising an endless first sliding ring and an intermediate tap, which is divided into a first range and a second range, and which is divided into a first range and a second range by an intermediate tap; a substantially ring-shaped resistor with both ends separated and connected to a first sliding ring by a first sliding contact; an endless second sliding ring to which an intermediate tap of the resistor is connected; and a second endless sliding ring of the resistor. a third arc-shaped sliding ring that extends from the intermediate tap to one end and is connected to the one end; and a third sliding ring that extends from the intermediate tap to the other end and is connected to the other end. a fourth arc-shaped sliding ring; a second sliding contact that contacts the second sliding ring and the third or fourth sliding ring; and when the first sliding contact slides into one of the first range or the second range of the resistor, the second sliding contact is placed in the first range or the second range of the resistor. A tuned voltage generating circuit characterized in that the circuit is in contact with a third sliding ring or a fourth sliding ring corresponding to the other side of the second range. 2. The tuning voltage generating circuit according to claim 1, wherein the second sliding ring is connected to an intermediate tap of the resistor through a switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP545882A JPS58123221A (en) | 1982-01-19 | 1982-01-19 | Tuning voltage generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP545882A JPS58123221A (en) | 1982-01-19 | 1982-01-19 | Tuning voltage generating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58123221A JPS58123221A (en) | 1983-07-22 |
| JPH0153524B2 true JPH0153524B2 (en) | 1989-11-14 |
Family
ID=11611774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP545882A Granted JPS58123221A (en) | 1982-01-19 | 1982-01-19 | Tuning voltage generating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58123221A (en) |
-
1982
- 1982-01-19 JP JP545882A patent/JPS58123221A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58123221A (en) | 1983-07-22 |
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