JPH0358079U - - Google Patents
Info
- Publication number
- JPH0358079U JPH0358079U JP11925989U JP11925989U JPH0358079U JP H0358079 U JPH0358079 U JP H0358079U JP 11925989 U JP11925989 U JP 11925989U JP 11925989 U JP11925989 U JP 11925989U JP H0358079 U JPH0358079 U JP H0358079U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- band
- channel signal
- signal
- trap
- 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
- 239000002131 composite material Substances 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Stereo-Broadcasting Methods (AREA)
Description
第１図は本考案の実施例を示すブロツク線図、
第２図はその２．７ｆＨバンドパス／４．５ｆＨ
トラツプ複合フイルタの具体構成を示す回路図、
第３図、第４図及び第５図は夫々実施例の各部の
周波数特性を示す曲線図、第６図はテレビ音声多
重信号の周波数スペクトラムを示す図、第７図は
従来例を示すブロツク線図、第８図、第９図及び
第１０図は夫々従来例の各部の周波数特性を示す
曲線図である。
１……テレビ音声多重信号復調用デコーダＩＣ
、２……デエンフアシス回路、３……バンドパス
／トラツプ複合フイルタ、４……ステレオ／二か
国語放送切換回路、５……トラツプフイルタ、６
……バンドパスフイルタ、７……リミツタ増幅器
、８……ＦＭ復調回路、９……デエンフアシス回
路、１０……バンドパスフイルタ、１１……検波
回路、１２……リードフイルタ、１３……自動切
換え信号発生回路である。
FIG. 1 is a block diagram showing an embodiment of the present invention;
Figure 2 shows the 2.7fH bandpass/4.5fH
A circuit diagram showing the specific configuration of a trap composite filter,
3, 4, and 5 are curve diagrams showing the frequency characteristics of each part of the embodiment, FIG. 6 is a diagram showing the frequency spectrum of a television audio multiplex signal, and FIG. 7 is a block diagram showing the conventional example. 8, 9, and 10 are curve diagrams showing the frequency characteristics of each part of the conventional example. 1...Decoder IC for demodulating TV audio multiplexed signals
, 2... De-emphasis circuit, 3... Band pass/trap composite filter, 4... Stereo/bilingual broadcast switching circuit, 5... Trap filter, 6
... Band pass filter, 7 ... Limiter amplifier, 8 ... FM demodulation circuit, 9 ... De-emphasis circuit, 10 ... Band pass filter, 11 ... Detection circuit, 12 ... Lead filter, 13 ... Automatic switching signal This is a generation circuit.
Claims (1)
より高域側の副チヤンネル信号、該副チヤンネル
信号の帯域より高域側の制御信号及び該制御信号
の帯域より高域側の情報チヤンネル信号から成る
テレビ音声多重信号復調用デコーダＩＣにおいて
、 上記副チヤンネル信号の周波数帯域内で、その
副搬送波周波数に対し高域側の第１の周波数を通
過帯域中心周波数とするバンドパス特性及び上記
情報チヤンネル信号の副搬送波周波数をトラツプ
周波数とするトラツプ特性を有する複合フイルタ
と、上記制御信号の副搬送波周波数をトラツプ周
波数とするトラツプフイルタと、上記副チヤンネ
ル信号の周波数帯域内で、その副搬送波周波数に
対し低域側の第２の周波数を帯域通過中心周波数
とするバンドパスフイルタとの縦続接続から成る
副チヤンネル信号抽出用フイルタを設けて成るテ
レビ音声多重信号復調用デコーダＩＣ。[Claims for Utility Model Registration] Main channel signal, sub-channel signal in a band higher than the band of the main channel signal, control signal in a band higher than the band of the sub-channel signal, and band higher than the band of the control signal A decoder IC for demodulating a TV audio multiplexed signal consisting of an information channel signal has a bandpass characteristic in which a first frequency higher than the subcarrier frequency within the frequency band of the subchannel signal is the center frequency of the passband. and a composite filter having a trap characteristic whose trap frequency is the subcarrier frequency of the information channel signal; a trap filter whose trap frequency is the subcarrier frequency of the control signal; A decoder IC for demodulating television audio multiplexed signals, comprising a sub-channel signal extraction filter which is connected in cascade with a bandpass filter whose bandpass center frequency is a second frequency on the lower side of the frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11925989U JPH0358079U (en) | 1989-10-12 | 1989-10-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11925989U JPH0358079U (en) | 1989-10-12 | 1989-10-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0358079U true JPH0358079U (en) | 1991-06-05 |
Family
ID=31667388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11925989U Pending JPH0358079U (en) | 1989-10-12 | 1989-10-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0358079U (en) |
-
1989
- 1989-10-12 JP JP11925989U patent/JPH0358079U/ja active Pending
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