JPS6440913U - - Google Patents
Info
- Publication number
- JPS6440913U JPS6440913U JP13656287U JP13656287U JPS6440913U JP S6440913 U JPS6440913 U JP S6440913U JP 13656287 U JP13656287 U JP 13656287U JP 13656287 U JP13656287 U JP 13656287U JP S6440913 U JPS6440913 U JP S6440913U
- Authority
- JP
- Japan
- Prior art keywords
- audio signal
- detector
- pass filter
- voltage value
- low
- 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 3
- 230000001934 delay Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Filters And Equalizers (AREA)
Description
第１図は本考案にかかるノイズリダクシヨン回
路のブロツク図、第２図は第１図の各部波形図、
第３図は従来のノイズリダクシヨン回路のブロツ
ク、第４図は第３図の動作説明図である。
１……フイルタ、２……３デテクタ、３……周
波数帯域幅可変のローパスフイルタ、４……遅延
回路。
Figure 1 is a block diagram of the noise reduction circuit according to the present invention, Figure 2 is a waveform diagram of each part of Figure 1,
FIG. 3 is a block diagram of a conventional noise reduction circuit, and FIG. 4 is an explanatory diagram of the operation of FIG. 3. 1... Filter, 2... 3 detector, 3... Low pass filter with variable frequency bandwidth, 4... Delay circuit.
Claims (1)
ロール信号を発生するデテクタと、 音声信号が入力され、該音声信号を遅延させる
遅延回路と、 遅延回路に接続され、前記コントロール信号の
電圧値により周波数帯域幅を変化させるローパス
フイルタとを有し、 該ローパスフイルタ出力をスピーカに入力する
ことを特徴とするノイズリダクシヨン回路。[Claims for Utility Model Registration] A detector that generates a control signal having a voltage value corresponding to an audio signal level; a delay circuit that receives an audio signal and delays the audio signal; and a detector that is connected to the delay circuit and that controls the control signal. 1. A noise reduction circuit comprising: a low-pass filter that changes the frequency bandwidth depending on the voltage value of a signal; and the output of the low-pass filter is input to a speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13656287U JPS6440913U (en) | 1987-09-07 | 1987-09-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13656287U JPS6440913U (en) | 1987-09-07 | 1987-09-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6440913U true JPS6440913U (en) | 1989-03-10 |
Family
ID=31397188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13656287U Pending JPS6440913U (en) | 1987-09-07 | 1987-09-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6440913U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7382551B2 (en) | 2005-11-30 | 2008-06-03 | Canon Kabushiki Kaisha | Zoom lens system and image-pickup apparatus including same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52117012A (en) * | 1976-03-29 | 1977-10-01 | Hitachi Denshi Ltd | S/n improvement |
| JPS616571A (en) * | 1984-06-19 | 1986-01-13 | 三洋電機株式会社 | Storage warehouse |
-
1987
- 1987-09-07 JP JP13656287U patent/JPS6440913U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52117012A (en) * | 1976-03-29 | 1977-10-01 | Hitachi Denshi Ltd | S/n improvement |
| JPS616571A (en) * | 1984-06-19 | 1986-01-13 | 三洋電機株式会社 | Storage warehouse |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7382551B2 (en) | 2005-11-30 | 2008-06-03 | Canon Kabushiki Kaisha | Zoom lens system and image-pickup apparatus including same |