JPH0292239U - - Google Patents
Info
- Publication number
- JPH0292239U JPH0292239U JP66989U JP66989U JPH0292239U JP H0292239 U JPH0292239 U JP H0292239U JP 66989 U JP66989 U JP 66989U JP 66989 U JP66989 U JP 66989U JP H0292239 U JPH0292239 U JP H0292239U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- detector
- noise
- voltage
- rotation speed
- 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
- 230000005236 sound signal Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Description
第１図は本考案のラジオ受信機に搭載されるノ
イズキヤンセラー回路のブロツクダイヤ図、第２
図はエンジン回転数と発生するノイズ量の関係を
示す図、第３図はオーデイオ信号に重畳されたイ
グニシヨンノイズの波形図である。第４図乃至第
７図は従来技術を説明する図で、それぞれ第４図
はノイズキヤンセラー回路のブロツクダイヤ図、
第５図と第７図はノイズが重畳したオーデイオ信
号波形図、第６図はエンジン回転数とノイズ量の
関係を示す図である。
３…ローパスフイルタ、４…ハイパスフイルタ
、７…ノイズ検出器、１１…単安定マルチ回路、
１４…ゲート回路、２０…回転数検出器、２２…
周波数―電圧変換回路。
Figure 1 is a block diagram of the noise canceller circuit installed in the radio receiver of the present invention.
The figure shows the relationship between the engine speed and the amount of noise generated, and FIG. 3 is a waveform diagram of ignition noise superimposed on the audio signal. FIGS. 4 to 7 are diagrams explaining the prior art, and FIG. 4 is a block diagram of a noise canceller circuit, and FIG.
5 and 7 are audio signal waveform diagrams on which noise is superimposed, and FIG. 6 is a diagram showing the relationship between the engine rotation speed and the amount of noise. 3...Low pass filter, 4...High pass filter, 7...Noise detector, 11...Monostable multi-circuit,
14... Gate circuit, 20... Rotation speed detector, 22...
Frequency-voltage conversion circuit.
Claims (1)
ーデイオ信号に重畳されたイグニシヨンノイズを
除去するイグニシヨンノイズキヤンセラー回路と
、車両のエンジン回転数を検出する回転数検出器
と、該検出器出力信号を直流電圧に変換する周波
数―電圧変換回路とを備え、上記直流電圧の制御
により上記ノイズ検出器の検出感度と上記単安定
マルチ回路の出力パルス幅を自動的に調整するこ
とを特徴とするラジオ受信機。 An ignition noise canceller circuit that includes a noise detector and a monostable multi-circuit and removes ignition noise superimposed on an audio signal, a rotation speed detector that detects the engine rotation speed of a vehicle, and the detector It is characterized by comprising a frequency-voltage conversion circuit that converts an output signal into a DC voltage, and automatically adjusts the detection sensitivity of the noise detector and the output pulse width of the monostable multi-circuit by controlling the DC voltage. radio receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP66989U JPH0644188Y2 (en) | 1989-01-07 | 1989-01-07 | Radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP66989U JPH0644188Y2 (en) | 1989-01-07 | 1989-01-07 | Radio receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0292239U true JPH0292239U (en) | 1990-07-23 |
| JPH0644188Y2 JPH0644188Y2 (en) | 1994-11-14 |
Family
ID=31199903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP66989U Expired - Fee Related JPH0644188Y2 (en) | 1989-01-07 | 1989-01-07 | Radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0644188Y2 (en) |
-
1989
- 1989-01-07 JP JP66989U patent/JPH0644188Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0644188Y2 (en) | 1994-11-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |