JPH01126700U - - Google Patents
Info
- Publication number
- JPH01126700U JPH01126700U JP1770988U JP1770988U JPH01126700U JP H01126700 U JPH01126700 U JP H01126700U JP 1770988 U JP1770988 U JP 1770988U JP 1770988 U JP1770988 U JP 1770988U JP H01126700 U JPH01126700 U JP H01126700U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- path
- audio
- audio signal
- 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
- 239000011159 matrix material Substances 0.000 claims description 4
- 230000005236 sound signal Effects 0.000 claims 7
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案のサウンドシステム回路の一実
施例を示す概略ブロツク図、第２図は従来のサウ
ンドシステム回路を示す概略ブロツク図、第３図
はドルビーサラウンドデコーダ回路の詳細を示す
ブロツク図である。
２４……サラウンドマトリツクス回路、２５…
…デジタル音声処理回路、２９……エコー回路、
２６，２７……ローパスフイルター回路、２８…
…デジタルサウンドプロセツサＩＣ。
FIG. 1 is a schematic block diagram showing one embodiment of the sound system circuit of the present invention, FIG. 2 is a schematic block diagram showing a conventional sound system circuit, and FIG. 3 is a block diagram showing details of a Dolby surround decoder circuit. be. 24...Surround matrix circuit, 25...
...Digital audio processing circuit, 29...Echo circuit,
26, 27...Low pass filter circuit, 28...
...Digital sound processor IC.
Claims (1)
声入力切換回路と、前記切換回路から出力される
音声信号よりモノラル信号入力時には和信号また
ステレオ信号入力時には差信号を作成するサウン
ドマトリツクス回路と、前記切換回路から出力さ
れる音声信号をフロント側の音声出力回路へ送出
する第１の経路と、該経路から分岐して前記音声
信号を前記サラウンドマトリツクス回路へ送出す
る第２の経路と、前記マトリツクス回路から出力
される音声信号のデイレイタイム、ゲイン、極性
、周波数を可変するデジタルサウンドＩＣと該Ｉ
Ｃの前後に接続される２つのローパスフイルタか
らなるデジタル音声処理回路と、該処理回路によ
つて処理された音声信号を再びその処理回路へフ
イードバツクするエコー回路と、前記処理回路か
ら出力された音声信号をドルビーサラウンドモー
ド時には変形ドルビーＢ型ノイズリダクシヨン回
路によつて処理して出力し、ドルビーサウンドモ
ード時以外は前記ノイズリダクシヨン回路で処理
する前の前記音声信号を出力するように切換える
切換回路と、該切換回路からの音声信号を第１の
経路に供給する第３の経路と、該第３の経路を前
記第２の経路に接続または非接続とする切換回路
とを備えるサウンドシステム回路。 an audio input switching circuit that inputs a stereo signal or a monaural signal; a sound matrix circuit that creates a sum signal when a monaural signal is input and a difference signal when a stereo signal is input from the audio signal output from the switching circuit; a first path that sends the output audio signal to the front side audio output circuit; a second path that branches off from the path and sends the audio signal to the surround matrix circuit; and an output from the matrix circuit. A digital sound IC that changes the delay time, gain, polarity, and frequency of an audio signal and the corresponding I
A digital audio processing circuit consisting of two low-pass filters connected before and after C, an echo circuit that feeds back the audio signal processed by the processing circuit to the processing circuit, and the audio output from the processing circuit. a switching circuit that outputs the signal processed by the modified Dolby B type noise reduction circuit when in Dolby surround mode, and outputs the audio signal before being processed by the noise reduction circuit when in other than Dolby sound mode; A sound system circuit comprising: a third path for supplying an audio signal from the switching circuit to the first path; and a switching circuit for connecting or disconnecting the third path to the second path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1770988U JPH01126700U (en) | 1988-02-12 | 1988-02-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1770988U JPH01126700U (en) | 1988-02-12 | 1988-02-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01126700U true JPH01126700U (en) | 1989-08-30 |
Family
ID=31231733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1770988U Pending JPH01126700U (en) | 1988-02-12 | 1988-02-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01126700U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56159694A (en) * | 1980-05-15 | 1981-12-09 | Clarion Co Ltd | Semiconductor echo device |
| JPS59158200A (en) * | 1983-02-25 | 1984-09-07 | Sony Corp | Sound processing circuit |
| JPS62122500A (en) * | 1985-11-22 | 1987-06-03 | Sony Corp | Multi-channel stereo reproducing device |
-
1988
- 1988-02-12 JP JP1770988U patent/JPH01126700U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56159694A (en) * | 1980-05-15 | 1981-12-09 | Clarion Co Ltd | Semiconductor echo device |
| JPS59158200A (en) * | 1983-02-25 | 1984-09-07 | Sony Corp | Sound processing circuit |
| JPS62122500A (en) * | 1985-11-22 | 1987-06-03 | Sony Corp | Multi-channel stereo reproducing device |
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