JPH01107223U - - Google Patents
Info
- Publication number
- JPH01107223U JPH01107223U JP1988001689U JP168988U JPH01107223U JP H01107223 U JPH01107223 U JP H01107223U JP 1988001689 U JP1988001689 U JP 1988001689U JP 168988 U JP168988 U JP 168988U JP H01107223 U JPH01107223 U JP H01107223U
- Authority
- JP
- Japan
- Prior art keywords
- filter
- signal
- intermediate frequency
- tuner
- 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
- 238000010586 diagram Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図はこの考案に係る自動探局選局回路の一
実施例を示すブロツク図、第２図は従来の選局回
路を示すブロツク図、第３図及び第４図は第２図
の構成の動作を説明するスペクトル図である。
１２……電子同調チユーナ、１３……映像中間
周波回路、１４……中央演算処理回路、１５……
ＰＬＬ回路、１６……選局キーボード、１７……
ＩＦ帯域フイルター（第２のフイルター）、１８
……スイツチ付きフイルター回路（第１のフイル
ター）。
FIG. 1 is a block diagram showing an embodiment of the automatic tuning circuit according to this invention, FIG. 2 is a block diagram showing a conventional tuning circuit, and FIGS. 3 and 4 are the configurations of FIG. 2. FIG. 2 is a spectrum diagram explaining the operation of FIG. 12...Electronic tuning tuner, 13...Video intermediate frequency circuit, 14...Central processing circuit, 15...
PLL circuit, 16... Tuning keyboard, 17...
IF band filter (second filter), 18
...Filter circuit with switch (first filter).
Claims (1)
リア周波数のずれに応じた周波数弁別電圧と前記
中間周波信号又は検波出力中の同期信号とを出力
する中間周波回路と、 前記電子同調チユーナと中間周波回路との間に
設けられ中間周波信号を所定通過域範囲の信号に
制限する第１のフイルター、これより広い帯域の
信号を通過する第２のフイルター及び可制御スイ
ツチとから成る中間周波帯域フイルター回路と、 前記可制御スイツチを制御するコントロール信
号を発生する手段と前記同期信号及び周波数弁別
電圧の検出にて有信号を識別する手段とを有し、
電子同調チユーナに自動探局用のチユーニング電
圧を供給して自動探局を行う場合は中間周波信号
が少なくとも前記第１のフイルターを通るように
可制御スイツチを切換え接続し、有信号の識別で
第２のフイルターのみを通過するように切換え制
御する選局コントロール手段と具備したことを特
徴とする自動探局選局回路。[Claims for Utility Model Registration] An electronically tuned tuner, and an intermediate frequency that outputs a frequency discrimination voltage according to a shift in carrier frequency of an intermediate frequency signal output from the tuner and a synchronization signal in the intermediate frequency signal or the detected output. a first filter provided between the electronic tuning tuner and the intermediate frequency circuit to limit the intermediate frequency signal to a signal in a predetermined passband range, a second filter that passes signals in a wider band than the first filter, and a second filter that passes signals in a wider band; an intermediate frequency band filter circuit comprising a control switch; means for generating a control signal for controlling the controllable switch; and means for identifying a signal by detecting the synchronization signal and frequency discrimination voltage;
When performing automatic station searching by supplying a tuning voltage for automatic station searching to an electronically tuned tuner, a controllable switch is connected so that the intermediate frequency signal passes through at least the first filter, and the first filter is detected by identifying the presence of a signal. An automatic channel selection circuit characterized by comprising a channel selection control means for controlling switching so that only the second filter is passed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988001689U JPH01107223U (en) | 1988-01-12 | 1988-01-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988001689U JPH01107223U (en) | 1988-01-12 | 1988-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01107223U true JPH01107223U (en) | 1989-07-19 |
Family
ID=31201793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988001689U Pending JPH01107223U (en) | 1988-01-12 | 1988-01-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01107223U (en) |
-
1988
- 1988-01-12 JP JP1988001689U patent/JPH01107223U/ja active Pending
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