JPH0427680U - - Google Patents
Info
- Publication number
- JPH0427680U JPH0427680U JP1990068493U JP6849390U JPH0427680U JP H0427680 U JPH0427680 U JP H0427680U JP 1990068493 U JP1990068493 U JP 1990068493U JP 6849390 U JP6849390 U JP 6849390U JP H0427680 U JPH0427680 U JP H0427680U
- Authority
- JP
- Japan
- Prior art keywords
- signals
- branch
- switch means
- intermediate frequency
- tuner
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 101100165533 Arabidopsis thaliana BLH2 gene Proteins 0.000 description 1
- 101100165535 Arabidopsis thaliana BLH4 gene Proteins 0.000 description 1
- 101100476710 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SAW1 gene Proteins 0.000 description 1
- 101000959126 Xenopus laevis Peptidyl-alpha-hydroxyglycine alpha-amidating lyase B Proteins 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Color Television Systems (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Description
第１図はこの考案に係る映像中間周波処理回路
の一実施例を示す構成図、第２図は第１図の具体
的回路の一例を示す構成図、第３図はテレビジヨ
ンＩＦ出力のスペクトル図、第４図はＮＴＳＣ−
Ｍ方式の信号を受信したときに必要なＩＦ選択特
性を示す特性図、第５図は従来の映像中間周波処
理回路を示す構成図、第６図はＰＡＬ−Ｂ／Ｇ方
式の信号を受信したときに必要なＩＦ選択特性を
示す特性図である。
１……アンテナ、２……チユーナ、５……映像
検波用集積回路、Ｌ１〜Ｌ３……コイル、Ｄ１〜
Ｄ４……ダイオード、Ｒ１〜Ｒ８……抵抗、Ｃ１
〜Ｃ５……コンデンサ、ＳＡＷ１，ＳＡＷ２……
表面波フイルタ、Ｑ１〜Ｑ５……トランジスタ、
１１……スイツチコントロール回路。
Fig. 1 is a block diagram showing an example of the video intermediate frequency processing circuit according to this invention, Fig. 2 is a block diagram showing an example of the specific circuit of Fig. 1, and Fig. 3 is the spectrum of the television IF output. Figure 4 is NTSC-
A characteristic diagram showing the IF selection characteristics required when receiving an M system signal, Figure 5 is a configuration diagram showing a conventional video intermediate frequency processing circuit, and Figure 6 is a characteristic diagram showing the IF selection characteristics required when receiving a PAL-B/G system signal. FIG. 3 is a characteristic diagram showing sometimes necessary IF selection characteristics. DESCRIPTION OF SYMBOLS 1...Antenna, 2...Tuner, 5...Video detection integrated circuit, L1 - L3 ...Coil, D1-
D4 ...Diode, R1 to R8 ...Resistance, C1
~ C5 ...Capacitor, SAW1 , SAW2 ...
Surface wave filter, Q1 to Q5 ...transistor,
11...Switch control circuit.
Claims (1)
ン受像機の映像中間周波処理回路において、 チユーナと、 このチユーナからのＩＦ信号を複数の経路に分
岐する分岐手段と、 この分岐手段の各分岐経路に設けられ、それぞ
れのＩＦ信号を断続するＲＦスイツチ手段と、 前記ＲＦスイツチ手段の断続状態を、受信され
た信号の方式に応じてコントロールするコントロ
ール手段と、 前記ＲＦスイツチ手段を経た各分岐経路にそれ
ぞれ設けられ各放送方式の信号に対応っしたＩＦ
選択特性が決定された複数の表面波フイルタと、 前記表面波フイルタからのＩＦ出力を処理する
映像検波手段と、 を具備したことを特徴とする映像中間周波処理回
路。[Claim for Utility Model Registration] A video intermediate frequency processing circuit for a television receiver capable of receiving signals of different broadcasting systems, comprising: a tuner; branching means for branching an IF signal from the tuner into a plurality of paths; RF switch means provided on each branch path of the branch means and for intermittent IF signals; control means for controlling the on/off state of the RF switch means according to the format of the received signal; and the RF switch means. IFs are installed on each branch route after passing through and correspond to signals of each broadcasting system.
A video intermediate frequency processing circuit comprising: a plurality of surface wave filters having determined selection characteristics; and video detection means for processing IF output from the surface wave filters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990068493U JPH0427680U (en) | 1990-06-29 | 1990-06-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990068493U JPH0427680U (en) | 1990-06-29 | 1990-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0427680U true JPH0427680U (en) | 1992-03-05 |
Family
ID=31602980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990068493U Pending JPH0427680U (en) | 1990-06-29 | 1990-06-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0427680U (en) |
-
1990
- 1990-06-29 JP JP1990068493U patent/JPH0427680U/ja active Pending
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