JPH044440U - - Google Patents
Info
- Publication number
- JPH044440U JPH044440U JP1990045283U JP4528390U JPH044440U JP H044440 U JPH044440 U JP H044440U JP 1990045283 U JP1990045283 U JP 1990045283U JP 4528390 U JP4528390 U JP 4528390U JP H044440 U JPH044440 U JP H044440U
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- output
- electric field
- detection means
- audio
- 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 6
- 230000005684 electric field Effects 0.000 claims 3
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Circuits Of Receivers In General (AREA)
Description
第１図はこの考案に係る車載用テレビジヨン受
信装置の一実施例を示す構成図、第２図はこの考
案によつて切替えられるデイエンフアシス回路の
周波数特性の一例を示す特性図、第３図はダイバ
ーシテイ・ノイズを説明するタイミングチヤート
、第４図は従来のデイエンフアシス回路の周波数
特性を示す特性図である。
１１〜１３……アンテナ、２……アンテナ切替
回路、３……チユーナ、４……ＩＦ増幅回路、５
……映像検波回路、６……音声検波回路、７……
コンパレータ、８……デイエンフアシス回路、９
……ダイバーシテイ回路。
FIG. 1 is a block diagram showing an embodiment of the in-vehicle television receiver according to this invention, FIG. 2 is a characteristic diagram showing an example of the frequency characteristics of the de-emphasis circuit switched by this invention, and FIG. FIG. 4 is a timing chart illustrating diversity noise and is a characteristic diagram showing frequency characteristics of a conventional de-emphasis circuit. 1 1 to 1 3 ... antenna, 2 ... antenna switching circuit, 3 ... tuner, 4 ... IF amplifier circuit, 5
...Video detection circuit, 6...Audio detection circuit, 7...
Comparator, 8... De-emphasis circuit, 9
...Diversity circuit.
Claims (1)
テナ切替回路と、 前記選択されたアンテナからの信号を受信する
テレビジヨンチユーナと、 前記テレビジヨンチユーナの出力を映像検波及
び音声検波する映像検波手段及び音声検波手段と
、 前記選択されたアンテナから前記チユーナに入
力される高周波信号のレベルを表す信号と基準信
号とを比較し、その比較出力に基づいて受信電界
の強度を判定するコンパレータ手段と、 前記コンパレータ手段の判定出力に基づく強電
界時に前記アンテナ切替回路の動作を停止し、弱
・中電界時にアンテナ切替を行わしめるダイバー
シテイ手段と、 前記コンパレータ手段の判定出力に基づいて前
記音声検波手段からの音声信号の周波数特性を切
替える周波数特性切替手段と、 を具備することを特徴とする車載用テレビジヨン
受信装置。[Claims for Utility Model Registration] A plurality of antennas for diversity, an antenna switching circuit that selects one of the plurality of antennas, and a television channel that receives signals from the selected antenna; video detection means and audio detection means for video and audio detection of the output of the television tuner; comparing a signal representing the level of a high frequency signal input to the tuner from the selected antenna with a reference signal; comparator means for determining the strength of the received electric field based on the comparison output; and a diversity system for stopping the operation of the antenna switching circuit when the electric field is strong and switching the antenna when the electric field is weak or medium based on the judgment output of the comparator means. An in-vehicle television receiver comprising: means for switching the frequency characteristics of the audio signal from the audio detection means based on the determination output of the comparator means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990045283U JPH044440U (en) | 1990-04-27 | 1990-04-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990045283U JPH044440U (en) | 1990-04-27 | 1990-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH044440U true JPH044440U (en) | 1992-01-16 |
Family
ID=31559320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990045283U Pending JPH044440U (en) | 1990-04-27 | 1990-04-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH044440U (en) |
-
1990
- 1990-04-27 JP JP1990045283U patent/JPH044440U/ja active Pending
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