JPS62177108U - - Google Patents
Info
- Publication number
- JPS62177108U JPS62177108U JP6449286U JP6449286U JPS62177108U JP S62177108 U JPS62177108 U JP S62177108U JP 6449286 U JP6449286 U JP 6449286U JP 6449286 U JP6449286 U JP 6449286U JP S62177108 U JPS62177108 U JP S62177108U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- switch
- detection circuit
- potential difference
- time constant
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Amplifiers (AREA)
Description
第１図は本考案の車載用オーデイオ装置の要部
を示すブロツク図、第２，３図はそれぞれ本考案
の第１、第２実施例としての車載用オーデイオ装
置の要部を示すブロツク図である。
１……オーデイオ装置、２……ミユーテイング
制御回路、３……バツテリ、４……イグニツシヨ
ンキースイツチ、５……負荷、６……電位差設定
回路、７……時定数回路、８……スイツチオフ検
出回路、９……オア回路、１０……ミユーテイン
グトリガ回路、１１……電圧降下検出回路。
FIG. 1 is a block diagram showing the essential parts of the in-vehicle audio device of the present invention, and FIGS. 2 and 3 are block diagrams showing the essential parts of the in-vehicle audio device as the first and second embodiments of the present invention, respectively. be. DESCRIPTION OF SYMBOLS 1... Audio device, 2... Muting control circuit, 3... Battery, 4... Ignition key switch, 5... Load, 6... Potential difference setting circuit, 7... Time constant circuit, 8... Switch off Detection circuit, 9... OR circuit, 10... Muting trigger circuit, 11... Voltage drop detection circuit.
Claims (1)
フ用スイツチを介し電源からの電力の供給を受け
て作動する車載用オーデイオ装置において、 上記電源からの供給電圧に対し所要の電位差を
設定する電位差設定回路と、 コンデンサと抵抗とから成り上記電位差設定回
路からの出力を受ける時定数回路と、 該時定数回路からの出力および上記電源からの
供給電圧を受け上記スイツチのオフ時に生じる上
記供給電圧の所定値以上の急減を検出しその旨の
信号を出力するスイツチオフ検出回路と、 該スイツチオフ検出回路からの出力を受けミユ
ーテイング動作を行わせるミユーテイングトリガ
回路とを備えて構成されたことを特徴とする車載
用オーデイオ装置。 (2) 上記電源からの供給電圧を受け該供給電圧
が所要の設定値以下になると上記ミユーテイング
トリガ回路を動作させる電圧降下検出回路が設け
られた実用新案登録請求の範囲第１項記載の車載
用オーデイオ装置。[Scope of Claim for Utility Model Registration] (1) In a vehicle audio device that operates by receiving power from a power supply via a power on/off switch for the electrical system of a vehicle, a potential difference setting circuit for setting a required potential difference, a time constant circuit comprising a capacitor and a resistor and receiving an output from the potential difference setting circuit, and a time constant circuit receiving an output from the time constant circuit and a voltage supplied from the power supply to the switch. a switch-off detection circuit that detects a sudden decrease of more than a predetermined value in the supply voltage that occurs when the switch-off detection circuit is turned off and outputs a signal to that effect; and a muting trigger circuit that receives an output from the switch-off detection circuit and performs a muting operation. An in-vehicle audio device characterized in that: (2) A vehicle according to claim 1 of the utility model registration claim, which is provided with a voltage drop detection circuit that receives a supply voltage from the power supply and operates the mutating trigger circuit when the supply voltage falls below a required set value. audio equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6449286U JPS62177108U (en) | 1986-04-28 | 1986-04-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6449286U JPS62177108U (en) | 1986-04-28 | 1986-04-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62177108U true JPS62177108U (en) | 1987-11-10 |
Family
ID=30900696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6449286U Pending JPS62177108U (en) | 1986-04-28 | 1986-04-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62177108U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739113B2 (en) * | 1974-10-31 | 1982-08-19 | ||
| JPS594209A (en) * | 1982-06-29 | 1984-01-11 | Matsushita Electric Ind Co Ltd | Muting circuit preventing shock sound |
-
1986
- 1986-04-28 JP JP6449286U patent/JPS62177108U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739113B2 (en) * | 1974-10-31 | 1982-08-19 | ||
| JPS594209A (en) * | 1982-06-29 | 1984-01-11 | Matsushita Electric Ind Co Ltd | Muting circuit preventing shock sound |
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