JPS6447125U - - Google Patents
Info
- Publication number
- JPS6447125U JPS6447125U JP14234187U JP14234187U JPS6447125U JP S6447125 U JPS6447125 U JP S6447125U JP 14234187 U JP14234187 U JP 14234187U JP 14234187 U JP14234187 U JP 14234187U JP S6447125 U JPS6447125 U JP S6447125U
- Authority
- JP
- Japan
- Prior art keywords
- controller
- signal
- aft
- detection circuit
- changeover switch
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Television Receiver Circuits (AREA)
- Circuits Of Receivers In General (AREA)
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は、ＴＶ信号の同調動作、ＡＦＴ動作にお
ける各要素での信号波形を示すグラフ、第３図は
従来例のブロツク図である。
１……ＴＶフロントエンド、２……中間周波数
増幅回路、３……ＡＦＴ検波回路、４……ＰＬＬ
回路、５……コントローラ、６……切換スイツチ
。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a graph showing signal waveforms at each element in the TV signal tuning operation and AFT operation, and FIG. 3 is a block diagram of a conventional example. 1...TV front end, 2...Intermediate frequency amplifier circuit, 3...AFT detection circuit, 4...PLL
Circuit, 5... controller, 6... changeover switch.
Claims (1)
いて判別し、ＴＶフロントエンドのローカル周波
数を自動的に制御するＡ／Ｄコンバータ入力切換
装置において、上記コントローラへのＡ／Ｄ入力
端への上記信号を切換える切換スイツチを具備し
、上記切換スイツチを、上記コントローラの制御
信号で少なくともＡＦＴ動作中において一時的に
切換え、上記ＡＦＴ検波回路から上記コントロー
ラへの信号伝達を遮断しかつ他の制御信号を上記
コントローラのＡ／Ｄ入力端に供給するように構
成したことを特徴とするＡ／Ｄコンバータ入力切
換装置。 In an A/D converter input switching device that discriminates the signal from the AFT detection circuit using a controller and automatically controls the local frequency of the TV front end, the above-mentioned signal to the A/D input terminal of the above-mentioned controller is switched. A changeover switch is provided, and the changeover switch is temporarily switched at least during AFT operation using a control signal from the controller to cut off signal transmission from the AFT detection circuit to the controller and to transmit other control signals to the controller. An A/D converter input switching device, characterized in that it is configured to supply data to an A/D input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14234187U JPH0528836Y2 (en) | 1987-09-18 | 1987-09-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14234187U JPH0528836Y2 (en) | 1987-09-18 | 1987-09-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6447125U true JPS6447125U (en) | 1989-03-23 |
| JPH0528836Y2 JPH0528836Y2 (en) | 1993-07-23 |
Family
ID=31408201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14234187U Expired - Lifetime JPH0528836Y2 (en) | 1987-09-18 | 1987-09-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528836Y2 (en) |
-
1987
- 1987-09-18 JP JP14234187U patent/JPH0528836Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528836Y2 (en) | 1993-07-23 |
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