JPH0257678U - - Google Patents
Info
- Publication number
- JPH0257678U JPH0257678U JP8874088U JP8874088U JPH0257678U JP H0257678 U JPH0257678 U JP H0257678U JP 8874088 U JP8874088 U JP 8874088U JP 8874088 U JP8874088 U JP 8874088U JP H0257678 U JPH0257678 U JP H0257678U
- Authority
- JP
- Japan
- Prior art keywords
- signal level
- signal
- detection circuit
- level detection
- aft
- 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 3
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Television Receiver Circuits (AREA)
- Circuits Of Receivers In General (AREA)
Description
第１図はこの考案の一実施例になるＡＦＴ回路
を示すブロツク構成図、第２図は従来のＡＦＴ回
路を示すブロツク構成図、第３図はＢＰＦの通過
帯域特性を示す曲線図、第４図はＡＦＴ回路の出
力特性を示す曲線図である。
図において、３はＶＩＦ増幅回路、４はＡＦＴ
回路、７は信号レベル検出回路、９はスイツチン
グ・トランジスタ、１０はスイツチング・ダイオ
ードである。なお、図中同一符号は同一または相
当部分を示す。
FIG. 1 is a block configuration diagram showing an AFT circuit as an embodiment of this invention, FIG. 2 is a block configuration diagram showing a conventional AFT circuit, FIG. 3 is a curve diagram showing the pass band characteristics of BPF, and FIG. The figure is a curve diagram showing the output characteristics of the AFT circuit. In the figure, 3 is a VIF amplifier circuit, 4 is an AFT
7 is a signal level detection circuit, 9 is a switching transistor, and 10 is a switching diode. Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
波数を制御する局部発振周波数制御（以下「ＡＦ
Ｔ」という）回路を有するものにおいて、 信号レベルを検出する信号レベル検出回路と、 この信号レベル検出回路の出力に応じて動作す
るスイツチング素子とを備え、上記信号レベルが
弱信号または無信号のときに上記ＡＦＴ電圧を基
準電圧よりも小さくなるようにしたことを特徴と
するテレビジヨン受像機。[Claims for Utility Model Registration] Local oscillation frequency control (hereinafter referred to as “AF
A signal level detection circuit that detects a signal level, and a switching element that operates according to the output of this signal level detection circuit, when the signal level is a weak signal or no signal. A television receiver characterized in that the AFT voltage is smaller than a reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8874088U JPH0257678U (en) | 1988-07-04 | 1988-07-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8874088U JPH0257678U (en) | 1988-07-04 | 1988-07-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0257678U true JPH0257678U (en) | 1990-04-25 |
Family
ID=31313300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8874088U Pending JPH0257678U (en) | 1988-07-04 | 1988-07-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0257678U (en) |
-
1988
- 1988-07-04 JP JP8874088U patent/JPH0257678U/ja active Pending
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