JPH0348926U - - Google Patents
Info
- Publication number
- JPH0348926U JPH0348926U JP11024289U JP11024289U JPH0348926U JP H0348926 U JPH0348926 U JP H0348926U JP 11024289 U JP11024289 U JP 11024289U JP 11024289 U JP11024289 U JP 11024289U JP H0348926 U JPH0348926 U JP H0348926U
- Authority
- JP
- Japan
- Prior art keywords
- audio signal
- digital audio
- circuit
- switching
- input
- 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
- 230000005236 sound signal Effects 0.000 claims description 14
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Landscapes
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
- Electronic Switches (AREA)
Description
第１図は本考案の一実施例を示すブロツク図、
第２図は第１図の要部を示す図、第３図は従来例
を示すブロツク図である。
１……アナログ・オーデイオ信号入力端子、２
……デイジタル・オーデイオ信号入力端子、４…
…Ｄ／Ａ変換器、５′……切換スイツチ、６……
増幅器、８……切換制御回路、９……積分回路、
１０……制御信号発生回路部。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing the main part of FIG. 1, and FIG. 3 is a block diagram showing a conventional example. 1...Analog audio signal input terminal, 2
...Digital audio signal input terminal, 4...
...D/A converter, 5'... Selector switch, 6...
amplifier, 8... switching control circuit, 9... integrating circuit,
10...Control signal generation circuit section.
Claims (1)
子と、デイジタル・オーデイオ信号の入力端子と
、該デイジタル・オーデイオ信号入力端子に加え
られたデイジタル・オーデイオ信号を第２のアナ
ログ・オーデイオ信号に変換するＤ／Ａ変換器と
、前記第１のアナログ・オーデイオ信号と前記第
２のアナログ・オーデイオ信号とを選択的に増幅
器に印加するための切換スイツチとを備えた入力
切換回路に於いて、前記デイジタル・オーデイオ
信号入力端子からのデイジタル・オーデイオ信号
の有無に応じて前記切換スイツチを切換制御する
切換制御回路を設けたことを特徴とする入力切換
回路。 (2) デイジタル・オーデイオ信号はバイフエー
ズマーク変調されたデイジタル・オーデイオ信号
であることを特徴とする実用新案登録請求の範囲
第１項記載の入力切換回路。 (3) 切換スイツチは、集積回路にて構成された
スイツチであることを特徴とする実用新案登録請
求の範囲第１項又は第２項記載の入力切換回路。 (4) 切換制御回路は、デイジタル・オーデイオ
信号の直流成分を取出す積分回路と、該積分回路
の出力に応じて所定レベルの制御出力を発生する
制御信号発生回路部とで構成されていることを特
徴とする実用新案登録請求の範囲第１項乃至第３
項のいずれかに記載の入力切換回路。[Claims for Utility Model Registration] (1) A first analog audio signal input terminal, a digital audio signal input terminal, and a second digital audio signal input terminal. an input comprising: a D/A converter for converting the first analog audio signal into an analog audio signal; and a changeover switch for selectively applying the first analog audio signal and the second analog audio signal to an amplifier. An input switching circuit characterized in that the switching circuit includes a switching control circuit that controls switching of the switching switch depending on the presence or absence of a digital audio signal from the digital audio signal input terminal. (2) The input switching circuit according to claim 1, wherein the digital audio signal is a biphase mark modulated digital audio signal. (3) The input switching circuit according to claim 1 or 2 of the utility model registration, characterized in that the changeover switch is a switch constructed of an integrated circuit. (4) The switching control circuit is composed of an integrating circuit that extracts the DC component of the digital audio signal, and a control signal generating circuit that generates a control output at a predetermined level according to the output of the integrating circuit. Featured utility model registration claims Paragraphs 1 to 3
The input switching circuit described in any of paragraphs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11024289U JPH0348926U (en) | 1989-09-19 | 1989-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11024289U JPH0348926U (en) | 1989-09-19 | 1989-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0348926U true JPH0348926U (en) | 1991-05-13 |
Family
ID=31658790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11024289U Pending JPH0348926U (en) | 1989-09-19 | 1989-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0348926U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6386916A (en) * | 1986-09-30 | 1988-04-18 | Yamaha Corp | Signal selecting circuit |
-
1989
- 1989-09-19 JP JP11024289U patent/JPH0348926U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6386916A (en) * | 1986-09-30 | 1988-04-18 | Yamaha Corp | Signal selecting circuit |
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