JPH0236269U - - Google Patents
Info
- Publication number
- JPH0236269U JPH0236269U JP11441788U JP11441788U JPH0236269U JP H0236269 U JPH0236269 U JP H0236269U JP 11441788 U JP11441788 U JP 11441788U JP 11441788 U JP11441788 U JP 11441788U JP H0236269 U JPH0236269 U JP H0236269U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- switching
- response
- television receiver
- filter
- 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
- 238000010897 surface acoustic wave method Methods 0.000 claims description 2
- 108091006146 Channels Proteins 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Description
第１図は本考案の一実施例を示す放送方式自動
切換回路の回路図、第２図は従来例を示す回路図
である。
図中、１……アンテナ、２……チユーナ、３…
…表面弾性波フイルタ、４……映像中間周波増幅
・検波回路、５……音声周波判別回路、６……ス
イツチング回路、７……共振回路、８……クロマ
回路、Ａ……複合映像信号入力端、Ｄ……スイツ
チングダイオード、Ｂ……Ｂ電源、Ｆ……制御電
圧出力端、Ｇ……Ｂ電圧出力端、Ｌ……コイル、
Ｑ１，Ｑ２……スイツチングトランジスタ、Ｒ１
〜Ｒ５……抵抗、Ｃ１〜Ｃ４……コンデンサ。
FIG. 1 is a circuit diagram of an automatic broadcast system switching circuit showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional example. In the figure, 1... Antenna, 2... Tuner, 3...
...Surface acoustic wave filter, 4...Video intermediate frequency amplification/detection circuit, 5...Audio frequency discrimination circuit, 6...Switching circuit, 7...Resonance circuit, 8...Chroma circuit, A...Composite video signal input Terminal, D...Switching diode, B...B power supply, F...Control voltage output terminal, G...B voltage output terminal, L...Coil,
Q1, Q2...Switching transistor, R1
~R5...Resistor, C1-C4...Capacitor.
Claims (1)
択的に受信する多方式テレビジヨン受像機におい
て、チヤンネル切り換えと対応して入力された音
声中間周波数を放送方式別に区分して制御電圧に
変換・出力する音声周波判別回路と、この制御電
圧を受けて作動するスイツチング回路とを設け、
スイツチング回路によりＢ電源をオン・オフして
共振回路と表面弾性波フイルタとからなるフイル
タ回路の共振回路定数を切り換えることにより、
同フイルタ回路の周波数選択度特性を自動的に切
り換えるテレビジヨン受像機。 In a multi-scheme television receiver that selectively receives multiple television broadcasts using different broadcasting systems, an audio system that converts and outputs the input audio intermediate frequency into control voltages according to the broadcasting system in response to channel switching. A frequency discrimination circuit and a switching circuit that operates in response to this control voltage are provided,
By turning the B power supply on and off using a switching circuit and switching the resonant circuit constant of the filter circuit consisting of a resonant circuit and a surface acoustic wave filter,
A television receiver that automatically switches the frequency selectivity characteristics of the filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11441788U JPH0236269U (en) | 1988-08-31 | 1988-08-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11441788U JPH0236269U (en) | 1988-08-31 | 1988-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0236269U true JPH0236269U (en) | 1990-03-08 |
Family
ID=31355146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11441788U Pending JPH0236269U (en) | 1988-08-31 | 1988-08-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0236269U (en) |
-
1988
- 1988-08-31 JP JP11441788U patent/JPH0236269U/ja active Pending
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