JPH03224321A - Television broadcast receiver - Google Patents
Television broadcast receiverInfo
- Publication number
- JPH03224321A JPH03224321A JP1962290A JP1962290A JPH03224321A JP H03224321 A JPH03224321 A JP H03224321A JP 1962290 A JP1962290 A JP 1962290A JP 1962290 A JP1962290 A JP 1962290A JP H03224321 A JPH03224321 A JP H03224321A
- Authority
- JP
- Japan
- Prior art keywords
- broadcast receiver
- television broadcast
- attenuation
- circuit
- attenuation circuit
- 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.)
- Pending
Links
- 230000005684 electric field Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 235000006481 Colocasia esculenta Nutrition 0.000 description 1
- 240000004270 Colocasia esculenta var. antiquorum Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、テレビ放送受信機に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a television broadcast receiver.
［従来の技術］
従来のテレビ放送受信機は、第３図に示す様な構成にな
っており、テレビ放送受信機のチューナー及び復調、利
得制御、ＡＦＯ機能を有するＰ工Ｆ部の性能により受信
電界の範囲が決ってしまうものであった。[Prior Art] A conventional television broadcasting receiver has a configuration as shown in Fig. 3, and the reception is controlled by the performance of the P/F section of the television broadcasting receiver, which has a tuner, demodulation, gain control, and AFO functions. The range of the electric field was determined.
［発明が解決しようとする課題］
しかし、従来の技術では、チューナー ＰＩＦの性能で
受信可能範囲が決ってしまうため、微弱な放送波でも選
局してしまったり、無局で選局してしまったりする。特
に移動体の中にある受信機は、電界強度が変動するため
、受信チャンネルの電界が弱（なり、不鮮明な画面まで
選局してしまう。そのため、電界強度が充分に強い希望
局を受信するのに時間と手数がかかってしまう。[Problem to be solved by the invention] However, with conventional technology, the receivable range is determined by the performance of the tuner PIF, so it is possible to tune in even with weak broadcast waves, or tune in without tuning. Relaxing. In particular, the electric field strength of a receiver inside a moving object fluctuates, so the electric field of the receiving channel is weak (and the screen may become unclear). It takes time and effort.
そこで、本発明はこのような問題を解決するもので、選
局時、自動チャンネル記憶機能時、一定電界強度以上だ
けを選択することを目的とする。SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and aims to select only those with an electric field strength above a certain level when selecting a channel or using an automatic channel storage function.
［課題を解決するための手段］
本発明のテレビ放送受信機は、
α） テレビ放送受信機において、
ｂ） 放送波を選局するチューナー部
Ｃ） 入力放送波を減衰させる減衰回路ｄ） 減衰回路
の減衰量の制御及びチューナー部の制御する制御部を持
つことを特徴とする。[Means for Solving the Problems] The television broadcast receiver of the present invention comprises: α) In the television broadcast receiver, b) A tuner unit that selects broadcast waves C) An attenuation circuit that attenuates input broadcast waves d) An attenuation circuit The present invention is characterized by having a control unit that controls the amount of attenuation of the tuner unit.
［実施例］ 以下に本発明について実施例に基づき詳細に説明する。[Example] The present invention will be described in detail below based on examples.
第１図は、不発明のテレビ放送受信機のブロック図であ
る。第２図は、減衰回路の実施例を示すアンテナより入
力された放送波は、チューナー１を通り、減衰回路２へ
入る。減衰回路２は、制御回路４により制御される。通
常動作時、減衰量がＯとなるような制御信号が制御回路
４より減衰回路２に入力される。局探し動作時及び局探
し自動チャンネル記憶動作時、制御回路４より入力信号
が減衰器を通るように制御信号が減衰回路２に入力され
る。局探し動作、局探し自動チャンネル記憶動作が終了
すると、通常動作に戻り、減衰回路２の減衰量は０とな
る。FIG. 1 is a block diagram of an inventive television broadcast receiver. FIG. 2 shows an embodiment of an attenuation circuit. Broadcast waves input from an antenna pass through a tuner 1 and enter an attenuation circuit 2. In FIG. Attenuation circuit 2 is controlled by control circuit 4 . During normal operation, a control signal such that the amount of attenuation becomes O is input from the control circuit 4 to the attenuation circuit 2. During a station search operation and a station search automatic channel storage operation, a control signal is input from the control circuit 4 to the attenuation circuit 2 so that the input signal passes through the attenuator. When the station search operation and station search automatic channel storage operation are completed, the normal operation returns and the attenuation amount of the attenuation circuit 2 becomes zero.
第２図は、減衰回路の一例を示す。通常の受信状態では
、制御回路４より制御端子２０１に“Ｈｉｇｈ”＝ Ｉ
ＩＪＩｌ］ｉ子２０２ Ｋ ” Ｌ ｏ Ｗ ” ヲ入
カスる。入力信号は、入力端子２０３からダイオード２
０５を介して出力端子２０４に減衰することなく出力さ
れる。局探し動作時は、制御端子２０１Ｋ”Ｌｏｗ
＋１ｌＪｌｌｌ端子２０２Ｋ”Ｈｌｇｈ”が印加され、
ダイオード２０５が非導通、ダイオード２０６が導通と
なり、信号は、アッテネータ２０７を介して出力端子２
０４へ出力される。FIG. 2 shows an example of an attenuation circuit. In a normal reception state, the control circuit 4 sends a signal to the control terminal 201 that is “High” = I
IJIl] i子202 K ” L o W ” wo enter Kasuru. The input signal is input from the input terminal 203 to the diode 2.
05 to the output terminal 204 without attenuation. During station search operation, control terminal 201K”Low
+1lJllll terminal 202K “Hlgh” is applied,
The diode 205 is non-conductive, the diode 206 is conductive, and the signal is passed through the attenuator 207 to the output terminal 2.
Output to 04.
局探し動作をして、有局と判断されると、局探し動作を
中止して通常動作状態へもどる。When the station searching operation is performed and it is determined that a station is available, the station searching operation is stopped and the operation returns to the normal operating state.
［発明の効果コ
以上、説明したように本発明によれば、局探し動作や局
探しして選局したチャンネルから順番に記憶していく場
合、電界強度の低いチャンネルを除くことができ、電界
強度が十分なチャンネルだけ簡曝にすばや（選局できる
。また微弱な放送波が多い場所や放送波の電界強度が変
動する場所では特に荷動となる。[Effects of the Invention] As explained above, according to the present invention, when performing a station search operation or searching for a station and storing the selected channels in order, channels with low electric field strength can be excluded, and the electric field You can quickly select only channels with sufficient strength.Also, in places where there are many weak broadcast waves or where the electric field strength of broadcast waves fluctuates, load movement may occur.
第１図は本発明のテレビ放送受信機の実施例をブロック
図で示したものである。
第２図は、不発明のテレビ放送受信機の実施例に示され
た減衰回路図である。
第３図は、従来のテレビ放送受信機のブロック図である
。
１・・・・・・・・チューナー
２・・・・・・・・・減衰回路
３ ・・・・・・・・・ ＰＩＦ Ｓ 工 Ｆ
４・・・・・・・−・制御回路
５・・・・・・・・・ビデオ、タロ１回路６・・・・・
・・・・画面表示部駆動回路７・・・・・・・・・画面
表示部
２０１・・・・・−・・制御端子
２０２・・・・・・・・・制御端子
２Ｃ１＋・・・・・・・・・入力端子
２０４・・・・・・・・・出力端子
５・・・・・・・・・ダイオード
６・・・・・・・・・ダイオード
７・・・・・・・・・アッテネータ
以
上
ｉ［人 セイコーエプソン株式会社FIG. 1 is a block diagram showing an embodiment of a television broadcast receiver according to the present invention. FIG. 2 is an attenuation circuit diagram of an embodiment of the inventive television broadcast receiver. FIG. 3 is a block diagram of a conventional television broadcast receiver. 1...Tuner 2...Attenuation circuit 3...PIF S Engineering F
4......Control circuit 5...Video, Taro 1 circuit 6...
...Screen display unit drive circuit 7...Screen display section 201...Control terminal 202...Control terminal 2C1+... ...Input terminal 204...Output terminal 5...Diode 6...Diode 7...・Attenuator or higher i [person Seiko Epson Corporation
Claims (1)
徴とするテレビ放送受信機。[Scope of Claims] A) a television broadcast receiver, b) a tuner section for selecting broadcast waves, c) an attenuation circuit for attenuating input broadcast waves, and d) a control section for controlling the amount of attenuation of the attenuation circuit. Features: TV broadcast receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1962290A JPH03224321A (en) | 1990-01-30 | 1990-01-30 | Television broadcast receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1962290A JPH03224321A (en) | 1990-01-30 | 1990-01-30 | Television broadcast receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03224321A true JPH03224321A (en) | 1991-10-03 |
Family
ID=12004291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1962290A Pending JPH03224321A (en) | 1990-01-30 | 1990-01-30 | Television broadcast receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03224321A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005006280A (en) * | 2003-03-28 | 2005-01-06 | Maspro Denkoh Corp | Amplifier for television receiver |
-
1990
- 1990-01-30 JP JP1962290A patent/JPH03224321A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005006280A (en) * | 2003-03-28 | 2005-01-06 | Maspro Denkoh Corp | Amplifier for television receiver |
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