JPS5966230A - Noise eliminating device - Google Patents
Noise eliminating deviceInfo
- Publication number
- JPS5966230A JPS5966230A JP17720282A JP17720282A JPS5966230A JP S5966230 A JPS5966230 A JP S5966230A JP 17720282 A JP17720282 A JP 17720282A JP 17720282 A JP17720282 A JP 17720282A JP S5966230 A JPS5966230 A JP S5966230A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- output
- scrn
- analog switch
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 230000005236 sound signal Effects 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
- H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
Landscapes
- Noise Elimination (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明はアナログ信号の記録されたレコードやディジタ
ル信号の記録されたディスクの再生におる雑音除去装置
に関するもの”Ｃ’ｈる。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a noise removal device for reproducing records on which analog signals are recorded or discs on which digital signals are recorded.
従来例の構成とその問題点□
一般に！レコードのノイズリダクションと尼キはレーー
ドの再生時に□生する耳ざわｉなサフー□−スノイズを
除去するＣＸと呼赫れる雑音除去装置が知られている。Conventional configuration and its problems □ In general! Regarding noise reduction of records, a noise removal device called CX is known which removes the harsh noise generated when playing records.
この雑音除去装置は入力信号を低域逆撫フロ・・夕に通
し′キ得た低門晟分を整流検波し、徊号伝送銘内に設け
た鼻Ｉｌ會制−回路を変化して入力信号し逃ルに応じて
周波数無性を制御するものであり、入力信号め小さい時
に再生帯域幅を制限してサフｘ”７ノイズ雰除去するこ
とができる。しかしながら、上述した雑音除去装置では
時定数回路を含んでいる一葆＋インパルス的なスクラッ
チノイズに対する応答性がなく、その除去発明の目的
″ □
本発明の目的は、スクラッチノイズとリアルタイλで防
止することカーでき茗雑響除去装置牟提供することにあ
る。″ □
発明の構成
本発明の雑音除去装置は、入力信号の一部を高次微分回
路を介してモノマルチ回路に加えると共にそのモノマル
チ回路の出力によって信号伝送系路内に設けたアナログ
スイッチを制御し、そのアナログスイッチの出力を演算
増幅器に加えるように構成し７だノイズ除去手段を付加
したものである。This noise removal device passes the input signal through a low-frequency reverse wave filter, rectifies and detects the obtained low frequency component, and inputs it by changing the nose Il control circuit installed in the signal transmission sign. This is to control the frequency neutrality according to signal leakage, and when the input signal is small, it is possible to limit the reproduction bandwidth and remove the noise atmosphere. The object of the invention is to remove the noise that contains a constant circuit and has no responsiveness to impulse scratch noise.
'' □ An object of the present invention is to provide a noise canceling device that can prevent scratch noise and real time λ. is applied to the monomulti circuit via a high-order differentiating circuit, and an analog switch provided in the signal transmission line is controlled by the output of the monomulti circuit, and the output of the analog switch is applied to the operational amplifier. This is an additional noise removal means.
実施例の説明
第１図は本発明の一実施例を示しており、第１図におい
て、１は信号源としてのレコード再生機からの再４ｒオ
ーディオ信号が加えられる入力端子、２は上記再生オー
ディオ信号の一部が供給される高次微分回路、３は上記
高次微分回路２の出力をトリガ信号として動作されるモ
ノマルチ回路、４は上記再生オーディオ信号の伝送系路
内に設けられて上記モノマルチ回路３の出力で制御され
るアナログスイッチ、５は上記アナログスイッチ４のは
上記演算増幅器５の出力信号の伝送系路内に設け／こ利
得制御回路、８は上記利得制御回路７への入力信号の一
部が加えられる低域通過フィルタを前段にもった整流回
路、９は上記整流回路８の出力が印加される時定数回路
であり、上記利得制御回路７に接続されている。１０は
出力端子である。DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows an embodiment of the present invention. In FIG. 1, 1 is an input terminal to which a re-4R audio signal from a record player as a signal source is applied, and 2 is an input terminal to which the reproduced audio signal is applied. A high-order differentiating circuit to which a part of the signal is supplied; 3 a mono multi-circuit operated using the output of the high-order differentiating circuit 2 as a trigger signal; 4 a mono multi-circuit provided in the transmission path of the reproduced audio signal; An analog switch 5 is controlled by the output of the mono multi-circuit 3; 5 is a gain control circuit provided in the transmission line for the output signal of the operational amplifier 5; 8 is a gain control circuit connected to the gain control circuit 7; A rectifier circuit having a low-pass filter at its front stage to which a part of the input signal is applied, 9 is a time constant circuit to which the output of the rectifier circuit 8 is applied, and is connected to the gain control circuit 7. 10 is an output terminal.
このような構成において、入力端子１よりの第２図ａに
示す再生オーディオ信号は高次微分回路２に印加され、
第２図すに示す微分信号を出力する。In such a configuration, the reproduced audio signal shown in FIG. 2a from the input terminal 1 is applied to the higher-order differentiator circuit 2,
The differential signal shown in FIG. 2 is output.
この場合、上記再生オーディオ信号は高次微分回路２に
て微分されるが、立ち上り時間と振幅が設定値より大き
なスクラッチノイズがあるとき、そのスクラッチノイズ
相嶋成分が次段のモノマルチ回路３のトリガ信号として
モノマルチ回路３に印加される。上記モノマルチ回路３
は上記トリガ信号が印加された場合に第２図Ｃに示すよ
うにスクラッチノイズ相当部分に所定の・ぐルスが出力
され、このパルスが次段のアナログスイッチ４に印加さ
れる。そのため、上記アナログスイッチ４は上記パルス
によってオフの状態となり、このアナログスイッチ４と
演算増幅器６との間のインビーダンの場合、コンデンサ
６はそのような信号レベルを保持するために設けられて
いる。この結果、上記演算増幅器５の出力には第２図ｄ
に示すようにスクラッチノイズが出力されなくなる。つ
まり、スクラッチノイズは除去されたことになる。−力
、上記演算増幅器５の一部は前段に低域通過フィルタを
もった整流回路８で整流し、時定数回路９に印加するこ
とにより利得制御回路７が制御される。In this case, the reproduced audio signal is differentiated by the high-order differentiating circuit 2, but if there is a scratch noise whose rise time and amplitude are larger than the set values, the scratch noise Aishima component triggers the next-stage monomulti circuit 3. It is applied to the mono multi circuit 3 as a signal. Mono multi circuit 3 above
When the above-described trigger signal is applied, a predetermined pulse is output to the portion corresponding to the scratch noise as shown in FIG. 2C, and this pulse is applied to the analog switch 4 at the next stage. Therefore, the analog switch 4 is turned off by the pulse, and in the case of interference between the analog switch 4 and the operational amplifier 6, the capacitor 6 is provided to maintain such a signal level. As a result, the output of the operational amplifier 5 shown in FIG.
Scratch noise is no longer output as shown in . In other words, scratch noise has been removed. A part of the operational amplifier 5 is rectified by a rectifier circuit 8 having a low-pass filter at the front stage, and the gain control circuit 7 is controlled by applying the rectifier to a time constant circuit 9.
その結果、出力端子１０には第３図に示すように入力信
号のレベルに応じて周波数特性が制御された信号が出力
される。つまり入力信号のレベルが小さい時に再生帯域
幅を制限するように周波数特性を制御する。As a result, a signal whose frequency characteristics are controlled according to the level of the input signal is outputted to the output terminal 10 as shown in FIG. In other words, the frequency characteristics are controlled so as to limit the reproduction bandwidth when the level of the input signal is small.
発明の効果
以上、詳述したように本発明によれば、入力信号の一部
を高次微分回路を介してモノマルチ回路に加えると共に
このモノマルチ回路の出力によって上記入力信号の伝送
系路内に挿入し、たアナログスイッチを制御し、そのア
ナログスイッチの出力を演算増幅器に加えるように構成
した第１のノイズ文除去手段を備えるので、インパルス
的なスクラッチノイズをリアルタイムで除去することが
できる。また、入力信号のレベルに応じて再生帯域幅を
制限する第２のノイズ除去手段を備えるので、ザフェー
スノイズを除去することができる利点を有する。Effects of the Invention As described above in detail, according to the present invention, a part of the input signal is added to the mono multi-circuit through the high-order differentiator circuit, and the output of the mono multi-circuit is used to convert the input signal into the transmission path of the input signal. Since the first noise sentence removal means is configured to be inserted into the circuit, control an analog switch, and apply the output of the analog switch to the operational amplifier, it is possible to remove impulsive scratch noise in real time. Furthermore, since the second noise removing means is provided to limit the reproduction bandwidth according to the level of the input signal, there is an advantage that the face noise can be removed.
第１図は本発明の雑音除去装置の一実施例を示すブロッ
ク図、第２図は同装置の各部の信号波形図、第３図は同
装置の周波数特性図である。
２・・・・・・高次微分回路、３・・・・・・モノマル
チ回路、４・・・・・・アナログスイッチ、５・・・・
・・演算増幅器、６・・・・・・コンデンサ、了・・・
・・・利得制御回路、８・・・・・・整流回路、９・・
・・・・時定数回路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第２
図
第３図
（ＬＢ
／ＮＰＩＪｊ
数（Ｈｚ。
１４７−
”＝２１Ｍ＋５
）FIG. 1 is a block diagram showing an embodiment of the noise removal device of the present invention, FIG. 2 is a signal waveform diagram of each part of the device, and FIG. 3 is a frequency characteristic diagram of the device. 2... High order differential circuit, 3... Mono multi circuit, 4... Analog switch, 5...
...Operation amplifier, 6...Capacitor, End...
... Gain control circuit, 8 ... Rectifier circuit, 9 ...
...Time constant circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 (LB/NPIJj number (Hz. 147-”=21M+5)
Claims (1)
に加えると共にとのモノマルチ回路の出・ ・
ｈ 力によって上記入力信号の祖送系路内に挿入サテナログ
スイッチを制御し、そのアナログスイッチの出力を演算
増幅器に加えるように一部した第１のノイズ除去手段と
、この第、必ノイズ除去手段の前段又は後段にｉけられ
ておち、入力信号の低域成分を整流して入力信号の伝蓬
系路に挿入した利樽制御回路に結合されている時定数回
路に加えることによシ周波数特性を入力橋号のレベルに
応じて制御するように構晟してｔ第２のノイズ除去手段
を備えてなる≠；−≠→雑音除去装置。[Claims] A part of the input signal is added to the mono multi-circuit via a high-order differentiating circuit, and the output of the mono multi-circuit is...
(h) a first noise removing means for controlling a satin analog switch inserted into the forwarding path of the input signal by a power, and applying the output of the analog switch to the operational amplifier; The signal is generated by rectifying the low-frequency component of the input signal and adding it to a time constant circuit connected to a control circuit inserted in the transmission path of the input signal. A ≠;-≠→noise removing device configured to control frequency characteristics according to the level of an input bridge signal and comprising a t-th noise removing means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17720282A JPS5966230A (en) | 1982-10-07 | 1982-10-07 | Noise eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17720282A JPS5966230A (en) | 1982-10-07 | 1982-10-07 | Noise eliminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5966230A true JPS5966230A (en) | 1984-04-14 |
Family
ID=16026956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17720282A Pending JPS5966230A (en) | 1982-10-07 | 1982-10-07 | Noise eliminating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5966230A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH074904U (en) * | 1993-05-31 | 1995-01-24 | カヤバ工業株式会社 | Stroke sensor for hydraulic / pneumatic cylinder |
| JPH08321001A (en) * | 1995-05-24 | 1996-12-03 | Nec Ic Microcomput Syst Ltd | Noise reduction circuit |
-
1982
- 1982-10-07 JP JP17720282A patent/JPS5966230A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH074904U (en) * | 1993-05-31 | 1995-01-24 | カヤバ工業株式会社 | Stroke sensor for hydraulic / pneumatic cylinder |
| JPH08321001A (en) * | 1995-05-24 | 1996-12-03 | Nec Ic Microcomput Syst Ltd | Noise reduction circuit |
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