JPH02128478U - - Google Patents
Info
- Publication number
- JPH02128478U JPH02128478U JP3561489U JP3561489U JPH02128478U JP H02128478 U JPH02128478 U JP H02128478U JP 3561489 U JP3561489 U JP 3561489U JP 3561489 U JP3561489 U JP 3561489U JP H02128478 U JPH02128478 U JP H02128478U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- intermediate frequency
- audio intermediate
- video
- outputs
- 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 7
- 238000000034 method Methods 0.000 claims 5
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Television Systems (AREA)
Description
第１図は本考案に係るマルチシステムテレビジ
ョン受像機の一実施例を示すブロツク図、第２図
は従来のマルチシステムテレビジョン受像機を示
すブロツク図、第３図は周波数判別回路５の特性
を示すグラフ、第４図は総合周波数特性を示す説
明図である。
１……チユーナ、２……ＢＰＦ、３……ＰＩＦ
検波回路、４……ＳＩＦコンバータ、５……周波
数判別回路、６，８，１３……スイツチ、９……
ＳＩＦ検波回路、１０……映像搬送波トラツプ、
１１……音声搬送波トラツプ、１２……フイール
ド周波数判別回路。
FIG. 1 is a block diagram showing an embodiment of a multi-system television receiver according to the present invention, FIG. 2 is a block diagram showing a conventional multi-system television receiver, and FIG. 3 is a characteristic of the frequency discrimination circuit 5. FIG. 4 is an explanatory diagram showing the overall frequency characteristics. 1...Chiyuna, 2...BPF, 3...PIF
Detection circuit, 4... SIF converter, 5... Frequency discrimination circuit, 6, 8, 13... Switch, 9...
SIF detection circuit, 10...video carrier trap,
11...Audio carrier wave trap, 12...Field frequency discrimination circuit.
Claims (1)
から得られる映像中間周波信号を検波可能な映像
検波回路と、 この映像検波回路が前記第１の方式群のＲＦ信
号を検波して出力する第１の音声中間周波信号の
周波数を所定の周波数に変換する音声中間周波コ
ンバータと、 前記映像検波回路が前記第２の方式群のＲＦ信
号を検波して出力する第２の音声中間周波信号と
前記音声中間周波コンバータの出力とを入力して
これらの入力信号の周波数に基づいた判別信号を
出力する周波数判別回路と、 前記第２の音声中間周波信号又は前記音声中間
周波コンバータの出力を入力し前記判別信号に基
づいて検波周波数を変化させて前記第１の音声中
間周波信号及び前記第２の音声中間周波信号を復
調可能とした音声検波回路とを具備したマルチシ
ステムテレビジョン受像機において、 前記映像検波回路が出力する映像信号のフイー
ルド周波数により入力ＲＦ信号が第１の方式群の
信号であるか第２の方式群の信号であるかを判別
してオン、オフ信号を出力するフイールド周波数
判別回路と、 前記オン、オフ信号により導通又は遮断して入
力ＲＦ信号の下側隣接チヤンネル映像搬送波をト
ラツプするか否かを制御するスイツチとを具備し
たことを特徴とするマルチシステムテレビジョン
受像機。[Claims for Utility Model Registration] A video detection circuit capable of detecting a video intermediate frequency signal obtained from input RF signals of a first method group and a second method group; an audio intermediate frequency converter that detects and outputs the RF signal of the first audio intermediate frequency signal to a predetermined frequency; and the video detection circuit detects and outputs the RF signal of the second method group. a frequency discrimination circuit that inputs a second audio intermediate frequency signal and the output of the audio intermediate frequency converter and outputs a discrimination signal based on the frequencies of these input signals; an audio detection circuit inputting the output of the audio intermediate frequency converter and changing the detection frequency based on the discrimination signal to be able to demodulate the first audio intermediate frequency signal and the second audio intermediate frequency signal. In a multi-system television receiver, it is determined whether the input RF signal is a signal of the first method group or a signal of the second method group based on the field frequency of the video signal outputted by the video detection circuit, and the signal is turned on. , a field frequency discrimination circuit that outputs an off signal, and a switch that controls whether or not to conduct or cut off in response to the on and off signals to trap the video carrier wave of the lower adjacent channel of the input RF signal. A multi-system television receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3561489U JPH02128478U (en) | 1989-03-30 | 1989-03-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3561489U JPH02128478U (en) | 1989-03-30 | 1989-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02128478U true JPH02128478U (en) | 1990-10-23 |
Family
ID=31541122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3561489U Pending JPH02128478U (en) | 1989-03-30 | 1989-03-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02128478U (en) |
-
1989
- 1989-03-30 JP JP3561489U patent/JPH02128478U/ja active Pending
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