JPH0158173U - - Google Patents
Info
- Publication number
- JPH0158173U JPH0158173U JP15314287U JP15314287U JPH0158173U JP H0158173 U JPH0158173 U JP H0158173U JP 15314287 U JP15314287 U JP 15314287U JP 15314287 U JP15314287 U JP 15314287U JP H0158173 U JPH0158173 U JP H0158173U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- envelope
- detection means
- forming
- input signal
- 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 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案のエンベロープ形成回路の回路
図、第２図は本考案回路を使用したトラツキング
サーボ回路のブロツク図、第３図１、第３図２は
本考案動作の説明に供する図、第４図ａ、第４図
ｂ、第４図ｃは本考案が解決しようとする問題点
の説明に供する図である。
１…記録媒体、１１…グルーブ、３…光源、４
…コリメートレンズ、５…プリズム、６…ハーフ
ミラー、７…対物レンズ、８…アクチユエータ、
９１，９２…光電変換素子、１２，１３…エンベ
ロープ形成回路、１５…差動増幅器、１６…アク
チユエータ駆動回路、ＳＷ１，ＳＷ２…切替スイ
ツチ、１０１…ローパスフイルタ、１０２…差動
アンプ、１０３…エンベロープ検波回路、１０５
…差動アンプ。
Figure 1 is a circuit diagram of the envelope forming circuit of the present invention, Figure 2 is a block diagram of a tracking servo circuit using the circuit of the present invention, and Figures 3 1 and 3 are diagrams for explaining the operation of the present invention. , FIG. 4a, FIG. 4b, and FIG. 4c are diagrams for explaining the problems to be solved by the present invention. 1...Recording medium, 1 1 ...Groove, 3...Light source, 4
...Collimating lens, 5... Prism, 6... Half mirror, 7... Objective lens, 8... Actuator,
9 1 , 9 2 ... photoelectric conversion element, 12, 13 ... envelope forming circuit, 15 ... differential amplifier, 16 ... actuator drive circuit, SW 1 , SW 2 ... changeover switch, 101 ... low pass filter, 102 ... differential amplifier, 103...Envelope detection circuit, 105
...Differential amplifier.
Claims (1)
検出手段と、 該信号検出手段により検出された前記直流成分
信号と、前記入力信号との差信号を形成する減算
手段と、 該減算手段により形成された前記差信号の第１
のエンベロープ信号を検出するエンベロープ検出
手段と、 該エンベロープ検出手段により検出された前記
第１のエンベロープ信号と、前記信号検出手段に
より検出された前記直流成分信号とから、前記入
力信号の第２のエンベロープ信号を形成する加算
または減算手段を具備したことを特徴とするエン
ベロープ形成回路。[Claims for Utility Model Registration] Signal detection means for detecting a DC component signal from an input signal; and subtraction means for forming a difference signal between the DC component signal detected by the signal detection means and the input signal. , the first of said difference signals formed by said subtracting means.
envelope detection means for detecting an envelope signal of the input signal; and a second envelope of the input signal from the first envelope signal detected by the envelope detection means and the DC component signal detected by the signal detection means. An envelope forming circuit comprising an addition or subtraction means for forming a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15314287U JPH074591Y2 (en) | 1987-10-06 | 1987-10-06 | Envelope forming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15314287U JPH074591Y2 (en) | 1987-10-06 | 1987-10-06 | Envelope forming circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0158173U true JPH0158173U (en) | 1989-04-11 |
| JPH074591Y2 JPH074591Y2 (en) | 1995-02-01 |
Family
ID=31428712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15314287U Expired - Lifetime JPH074591Y2 (en) | 1987-10-06 | 1987-10-06 | Envelope forming circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH074591Y2 (en) |
-
1987
- 1987-10-06 JP JP15314287U patent/JPH074591Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH074591Y2 (en) | 1995-02-01 |
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