JPH01139611U - - Google Patents
Info
- Publication number
- JPH01139611U JPH01139611U JP3517588U JP3517588U JPH01139611U JP H01139611 U JPH01139611 U JP H01139611U JP 3517588 U JP3517588 U JP 3517588U JP 3517588 U JP3517588 U JP 3517588U JP H01139611 U JPH01139611 U JP H01139611U
- Authority
- JP
- Japan
- Prior art keywords
- mute signal
- power supply
- voltage
- output
- supply voltage
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Amplifiers (AREA)
Description
第１図はこの考案の一実施例の回路図。第２図
はこの考案の一実施例の作用の説明に供するタイ
ミング図。第３図は従来例の回路図。
１…車載蓄電池、２…定電圧回路、３…マイク
ロコンピユータ、Ｄ２…ツナーダイオード、Ｄ３
，Ｄ４およびＤ５…ダイオード、Ｑ２〜Ｑ４…ト
ランジスタ、Ｃ１…コンデンサ。
FIG. 1 is a circuit diagram of an embodiment of this invention. FIG. 2 is a timing diagram for explaining the operation of one embodiment of this invention. FIG. 3 is a circuit diagram of a conventional example. 1... Vehicle storage battery, 2... Constant voltage circuit, 3... Microcomputer, D 2 ... Tuner diode, D 3
, D4 and D5 ...diode, Q2 - Q4 ...transistor, C1 ...capacitor.
Claims (1)
圧が電源供給用スイツチを通して電源電圧として
車載音響機器に印加される車載音響機器のミユー
ト信号発生回路であつて、前記電源供給用スイツ
チを介した電源電圧が所定スレツシヨールドレベ
ルを超えたか否かを検出する第１の検出手段と、
定電圧化された前記車載蓄電池の電圧が常時電源
電圧として供給され、かつ前記第１の検出手段に
よる検出出力に伴つて第１のミユート信号を出力
する第１のミユート信号発生手段と、前記定電圧
化された前記車載蓄電池の電圧と前記スレツシヨ
ールドレベルとの大小を検出する第２の検出手段
と、前記第２の検出手段の出力に伴つて少なくと
も前記第１のミユート信号発生手段から第１のミ
ユート信号が出力されるまでの期間第２のミユー
ト信号を出力する第２のミユート信号発生手段と
、第１のミユート信号と第２のミユート信号とを
入力とし、かつ出力を合成ミユート信号とするオ
ア回路を備えたことを特徴とするミユート信号発
生回路。 A mute signal generation circuit for in-vehicle audio equipment in which the voltage of an in-vehicle storage battery via an engine key switch is applied to the in-vehicle audio equipment as a power supply voltage through a power supply switch, wherein the power supply voltage via the power supply switch is applied to the in-vehicle audio equipment as a power supply voltage. a first detection means for detecting whether the threshold level has been exceeded;
a first mute signal generating means to which the regulated voltage of the on-vehicle storage battery is always supplied as a power supply voltage and output a first mute signal in accordance with a detection output by the first detecting means; a second detecting means for detecting the magnitude of the voltage of the in-vehicle storage battery which has been converted into a voltage and the threshold level; and at least from the first mute signal generating means in accordance with the output of the second detecting means. a second mute signal generating means that outputs a second mute signal for a period until the first mute signal is output; A mute signal generation circuit characterized by comprising an OR circuit for generating a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3517588U JPH0540573Y2 (en) | 1988-03-18 | 1988-03-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3517588U JPH0540573Y2 (en) | 1988-03-18 | 1988-03-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01139611U true JPH01139611U (en) | 1989-09-25 |
| JPH0540573Y2 JPH0540573Y2 (en) | 1993-10-14 |
Family
ID=31261828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3517588U Expired - Lifetime JPH0540573Y2 (en) | 1988-03-18 | 1988-03-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0540573Y2 (en) |
-
1988
- 1988-03-18 JP JP3517588U patent/JPH0540573Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0540573Y2 (en) | 1993-10-14 |
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