JPH0351585U

JPH0351585U -

Info

Publication number: JPH0351585U
Application number: JP1989111007U
Authority: JP
Priority date: 1989-09-22
Filing date: 1989-09-22
Publication date: 1991-05-20

Description

[Brief explanation of drawings]

第１図は本考案のブロツクダイアグラム、第２
図は同期判別回路の接続図、第３図ａはＨＤＴＶ
用ＢＰＦフイルタの特性図、第４図ｂはＥＤＴＶ
用ＢＰＦフイルタの特性図である。１……ベースバンド変換回路、２……同期信号
検出回路、３……ＨＤＴＶ信号処理回路、４……
ＥＤＴＶ信号処理回路、５……同期判別回路、６
……アスペクト比変換回路、７……ＨＤＴＶ用Ｂ
ＰＦフイルタ、８……ＥＤＴＶ用ＢＰＦフイルタ
、９，１０……コンパレータ回路、１１……周波
数弁別回路、ＳＷ１，ＳＷ２……スイツチである
。 Figure 1 is a block diagram of the invention, Figure 2 is a block diagram of the invention.
The figure is a connection diagram of the synchronization discrimination circuit, and Figure 3a is the HDTV.
Characteristic diagram of BPF filter for EDTV, Figure 4b is
FIG. 3 is a characteristic diagram of a BPF filter for 1...Baseband conversion circuit, 2...Synchronization signal detection circuit, 3...HDTV signal processing circuit, 4...
EDTV signal processing circuit, 5...Synchronization determination circuit, 6
...Aspect ratio conversion circuit, 7...B for HDTV
PF filter, 8... BPF filter for EDTV, 9, 10... Comparator circuit, 11... Frequency discrimination circuit, SW1, SW2... Switch.

補正平１．２．３０図面の簡単な説明を次のように補正する。Correction: Heisei 1.2.30 The brief description of the drawing has been amended as follows.

【図面の簡単な説明】第１図は本考案のブロツクダイアグラム、第２
図は同期判別回路の接続図、第３図ａ，ｂはＢＰ
Ｆフイルタの特性図、第４図は従来のブロツクダ
イアグラムである。１……ベースバンド変換回路、２……同期信号
検出回路、３……ＨＤＴＶ信号処理回路、４……
ＥＤＴＶ信号処理回路、５……同期判別回路、６
……アスペクト比変換回路、７……ＨＤＴＶ用Ｂ
ＰＦフイルタ、８……ＥＤＴＶ用ＢＰＦフイルタ
、９，１０……コンパレータ回路、１１……周波
数弁別回路、ＳＷ１，ＳＷ２……スイツチ回路で
ある。[Brief explanation of the drawings] Figure 1 is a block diagram of the present invention; Figure 2 is a block diagram of the invention;
The figure is a connection diagram of the synchronization discrimination circuit, and Figure 3 a and b are BP
The characteristic diagram of the F filter, FIG. 4, is a conventional block diagram. 1...Baseband conversion circuit, 2...Synchronization signal detection circuit, 3...HDTV signal processing circuit, 4...
EDTV signal processing circuit, 5...Synchronization determination circuit, 6
...Aspect ratio conversion circuit, 7...B for HDTV
PF filter, 8... BPF filter for EDTV, 9, 10... Comparator circuit, 11... Frequency discrimination circuit, SW1, SW2... Switch circuit.

Claims

[Claims for Utility Model Registration] (1) In a receiving device that receives either HDTV or EDTV broadcast signals, the signal converted by the baseband conversion circuit is
A means for using a pulse extracted by band-limiting with a band-pass filter having a center frequency of 5 KHz as a first horizontal synchronizing pulse, and a means for using a pulse extracted by band-limiting a band-pass filter having a center frequency of 31.5 KHz as a first horizontal synchronizing pulse. means for generating a second horizontal synchronizing pulse; and a frequency discrimination circuit which receives as input signals a pulse obtained by shaping the first horizontal synchronizing pulse in a comparator circuit and a pulse shaping the second horizontal synchronizing pulse in a comparator circuit. HDTV or EDT
An automatic switching device for HDTV or EDTV signals, characterized in that it determines whether the signal is a V signal or not. (2) The HDT according to claim (1), wherein the frequency discrimination circuit comprises a flip-flop circuit.
Automatic switching device for V or EDTV signals.