JPH03115423U - - Google Patents
Info
- Publication number
- JPH03115423U JPH03115423U JP2406190U JP2406190U JPH03115423U JP H03115423 U JPH03115423 U JP H03115423U JP 2406190 U JP2406190 U JP 2406190U JP 2406190 U JP2406190 U JP 2406190U JP H03115423 U JPH03115423 U JP H03115423U
- Authority
- JP
- Japan
- Prior art keywords
- band filter
- signal
- tuner
- passes
- output
- 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 1
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図はこの考案に係るＡＦＴ回路の一実施例
を示す構成図、第２図はこの考案の動作を説明す
る特性図、第３図は従来のＡＦＴ回路を示す構成
図、第４図は従来のＡＦＴ誤動作の原因を説明す
る特性図である。
１２……チユーナ、１３，１７……ＳＡＷフイ
ルタ、１４，１８……ＩＦアンプ、１５，１９…
…リミツタアンプ、１６……ＦＭ検波器、２０…
…ビデオ検波器。
Fig. 1 is a block diagram showing an embodiment of the AFT circuit according to this invention, Fig. 2 is a characteristic diagram explaining the operation of this invention, Fig. 3 is a block diagram showing a conventional AFT circuit, and Fig. 4 is a block diagram showing an example of the AFT circuit according to this invention. FIG. 3 is a characteristic diagram illustrating the cause of conventional AFT malfunction. 12...Tuner, 13,17...SAW filter, 14,18...IF amplifier, 15,19...
...limiter amplifier, 16...FM detector, 20...
...Video detector.
Claims (1)
わせた通過特性にて通過させる第１の帯域フイル
タと、 この帯域フイルタからのＩＦ信号をビデオ検波
する検波手段と、 前記チユーナからのＩＦ出力を搬送波を中心に
左右対称の通過特性にて通過させる第２の帯域フ
イルタと、 この第２の帯域フイルタからのＩＦ信号を周波
数弁別し、周波数ずれに応じた電圧を発生するＡ
ＦＴ検波手段とを具備することを特徴とするＡＦ
Ｔ回路。[Claims for Utility Model Registration] A tuner that receives a television signal; a first band filter that passes the IF output from the tuner with a pass characteristic matching the characteristics of the signal; and an IF signal from the band filter. a second band filter that passes the IF output from the tuner with a pass characteristic that is symmetrical about the carrier wave; and a second band filter that performs frequency discrimination on the IF signal from the second band filter; A that generates a voltage according to the frequency shift
AF characterized by comprising FT detection means.
T circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2406190U JPH03115423U (en) | 1990-03-09 | 1990-03-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2406190U JPH03115423U (en) | 1990-03-09 | 1990-03-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03115423U true JPH03115423U (en) | 1991-11-28 |
Family
ID=31527038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2406190U Pending JPH03115423U (en) | 1990-03-09 | 1990-03-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03115423U (en) |
-
1990
- 1990-03-09 JP JP2406190U patent/JPH03115423U/ja active Pending
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