JPH0224682U - - Google Patents
Info
- Publication number
- JPH0224682U JPH0224682U JP10333188U JP10333188U JPH0224682U JP H0224682 U JPH0224682 U JP H0224682U JP 10333188 U JP10333188 U JP 10333188U JP 10333188 U JP10333188 U JP 10333188U JP H0224682 U JPH0224682 U JP H0224682U
- Authority
- JP
- Japan
- Prior art keywords
- audio
- circuit
- output signal
- output
- intermediate frequency
- 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
- 230000003321 amplification Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 2
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案に係る第１実施例を示す音声信
号切換回路とその周辺部分のブロツク図、第２図
は第１図における検波出力信号の出力特性を示す
グラフ、第３図は第１図の一部の具体的構成を示
す図、第４図は本考案に係る第２実施例を示す音
声信号切換回路とその周辺部分のブロツク図、第
５図は従来の音声信号切換回路とその周辺部分の
ブロツク図である。
１……アンテナ、２……チユーナ、３ａ，３ｂ
，３ｃ……音声中間周波増幅回路、４ａ，４ｂ，
４ｃ……音声ＦＭ検波回路、５ａ，５ｂ，５ｃ…
…中間周波増幅回路、６，６ａ，６ｂ，６ｃ，６
ｄ……比較器、７ａ，７ｂ，７ｃ……ＡＭ検波回
路、８，１６，ＳＷ１，ＳＷ２，ＳＷ３……切換
スイツチ、９……音声増幅回路、１０……ＡＮＤ
回路、１２……反転回路、１３……フイルタ、ｅ
，ｅ１，ｅ２，ｅ３……制御信号、Ｖ３，Ｖｒ１
，Ｖｒ２，Ｖｒ３，Ｖｒ４……基準電圧、Ｖｏ１
，Ｖｏ２……直流電圧成分。
FIG. 1 is a block diagram of an audio signal switching circuit and its surrounding parts showing a first embodiment of the present invention, FIG. 2 is a graph showing the output characteristics of the detected output signal in FIG. 1, and FIG. 4 is a block diagram of an audio signal switching circuit and its peripheral parts showing a second embodiment of the present invention, and FIG. 5 is a diagram showing a conventional audio signal switching circuit and its surroundings. FIG. 3 is a block diagram of the peripheral portion. 1...Antenna, 2...Chyuna, 3a, 3b
, 3c...Audio intermediate frequency amplification circuit, 4a, 4b,
4c...Audio FM detection circuit, 5a, 5b, 5c...
...Intermediate frequency amplification circuit, 6, 6a, 6b, 6c, 6
d...Comparator, 7a, 7b, 7c...AM detection circuit, 8, 16, SW1 , SW2 , SW3 ...Selector switch, 9...Audio amplifier circuit, 10...AND
Circuit, 12... Inverting circuit, 13... Filter, e
, e 1 , e 2 , e 3 ...control signal, V 3 , Vr 1
, Vr 2 , Vr 3 , Vr 4 ...Reference voltage, Vo 1
, Vo 2 ... DC voltage component.
Claims (1)
異なる周波数の信号を増幅する複数の音声中間周
波増幅回路と、前記音声中間周波増幅回路の出力
信号から各々低周波の音声出力信号を取り出す複
数の音声ＦＭ検波回路と、前記音声ＦＭ検波回路
の音声出力信号のうちから１つを選択する選択手
段とを備え、各種方式のテレビ放送を受信できる
テレビジヨン受像機に用いる音声信号切換回路に
おいて、前記音声出力信号の少なくとも１つから
直流電圧成分を取り出す第１手段と、前記第１手
段の出力信号に応じて前記選択手段を制御する制
御信号を出力する第２手段とを設けたことを特徴
とする音声信号切換回路。 a plurality of audio intermediate frequency amplification circuits each responding to the output of the tuner and amplifying signals of different frequencies; and a plurality of audio FM detection circuits each extracting a low frequency audio output signal from the output signal of the audio intermediate frequency amplification circuit. An audio signal switching circuit for use in a television receiver capable of receiving various types of television broadcasting, comprising: a circuit and a selection means for selecting one of the audio output signals of the audio FM detection circuit; and a second means for outputting a control signal for controlling the selection means in accordance with the output signal of the first means. switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10333188U JPH0224682U (en) | 1988-08-04 | 1988-08-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10333188U JPH0224682U (en) | 1988-08-04 | 1988-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0224682U true JPH0224682U (en) | 1990-02-19 |
Family
ID=31334064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10333188U Pending JPH0224682U (en) | 1988-08-04 | 1988-08-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0224682U (en) |
-
1988
- 1988-08-04 JP JP10333188U patent/JPH0224682U/ja active Pending
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