JP2527313B2 - Optical disc playback device - Google Patents
Optical disc playback deviceInfo
- Publication number
- JP2527313B2 JP2527313B2 JP61259350A JP25935086A JP2527313B2 JP 2527313 B2 JP2527313 B2 JP 2527313B2 JP 61259350 A JP61259350 A JP 61259350A JP 25935086 A JP25935086 A JP 25935086A JP 2527313 B2 JP2527313 B2 JP 2527313B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- section
- reading
- unit
- reading unit
- 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.)
- Expired - Lifetime
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、振動によって発生する一時的な音飛びを回
避できる光学ディスク再生装置に関する。Description: TECHNICAL FIELD The present invention relates to an optical disc reproducing apparatus capable of avoiding a temporary sound skip caused by vibration.
コンパクトディスク（CD）プレーヤは代表的な光学デ
ィスク再生装置の１つであるが、これを車載用に使用す
る場合には振動によって発生する音飛びが問題となる。
周知のようにCDプレーヤにはトラッキングエラーを最小
にするサーボ回路が内蔵されているので、通常は光学的
な読取部とトラックとの位置関係は精度良く保たれる。
しかし、振動が加わるとトラッキングザーボ回路のロッ
クレンジを越えたトラッキングエラーが生じてトラック
飛びを起こす。トラック飛びを起こしても制御情報をサ
ーチすることで元のトラックへ戻ることができるが、そ
れまでの間が一時的な音飛びとなる。この点を改善する
ために振動防止材等を使用しても、完全に振動の影響を
除去できるものではない。A compact disc (CD) player is one of the typical optical disc reproducing devices, but when it is used in a vehicle, skipping of sound caused by vibration becomes a problem.
As is well known, since a CD player has a built-in servo circuit that minimizes a tracking error, the positional relationship between the optical reading section and the track is normally maintained with high accuracy.
However, when vibration is applied, a tracking error exceeding the lock range of the tracking servo circuit occurs and a track jump occurs. Even if a track skip occurs, it is possible to return to the original track by searching the control information, but until then, there is a temporary skip. Even if an anti-vibration material is used to improve this point, the effect of vibration cannot be completely eliminated.
本発明は、上述した振動に起因する音飛びを、２つの
読取部を用いることで回避しようとするものである。The present invention is intended to avoid the sound skipping due to the vibration described above by using two reading units.
本発明は、光学ディスクの情報をトラックに沿って読
取る常用読取部と、該常用読取部の出力から音飛びを検
知する音飛び検知部と、該常用読取部より所定時間先の
情報を読取る補助読取部と、該補助読取部で読取った情
報を該所定時間だけ遅延させる遅延回路と、常時は該常
用読取部の出力を再生させ、前記音飛び検出部が音飛び
を検知したときに該遅延回路の出力を再生させる出力切
換部とその制御部とを備えてなることを特徴とするもの
である。The present invention provides a regular reading section for reading information on an optical disc along a track, a skipping detection section for detecting skipping from the output of the regular reading section, and an auxiliary for reading information a predetermined time ahead of the regular reading section. A reading unit, a delay circuit that delays the information read by the auxiliary reading unit by the predetermined time, an output of the regular reading unit is always reproduced, and the delay is generated when the sound skip detecting unit detects a sound skip. It is characterized by comprising an output switching section for reproducing the output of the circuit and a control section thereof.
２個の読取部が時間差を持って同じ情報を読取り、先
に読取った補助読取部の出力を該時間差だけ遅延させる
と、通常は該遅延出力と後に読取った常用読取部の出力
は等しい。これに対し、振動によって常用読取部の出力
に音飛びが生じたとき、補助読取部の遅延出力は振動の
発生していない時に読取った同じ情報の音飛びのない出
力である。従って、常時は常用読取部の出力を再生し、
該出力に音飛びが発生したら直ちに補助読取部の遅延出
力に切換えれば、振動による一時的な音飛びを回避する
ことできる。When the two reading units read the same information with a time difference and delay the output of the auxiliary reading unit read first by the time difference, the delayed output is usually equal to the output of the normal reading unit read later. On the other hand, when the output of the regular reading unit is skipped due to the vibration, the delayed output of the auxiliary reading unit is the output of the same information that is read when the vibration is not generated. Therefore, the output of the regular reading section is always reproduced,
Immediately after a sound skip occurs in the output, the delay output of the auxiliary reading unit is switched to, so that a temporary sound skip due to vibration can be avoided.
第１図は本発明の一実施例を示すブロック図で、１は
常用読取部、２は補助読取部、３はその出力をｔ秒遅延
させる遅延回路、４は常用読取部１の出力から音飛びを
検知する音飛び検知部、５は出力切換部、６はその制御
部、７は復調部、８は出力部である。FIG. 1 is a block diagram showing an embodiment of the present invention. 1 is a regular reading section, 2 is an auxiliary reading section, 3 is a delay circuit for delaying its output by t seconds, and 4 is a sound output from the regular reading section 1. A sound skip detection unit for detecting skipping, 5 is an output switching unit, 6 is a control unit thereof, 7 is a demodulation unit, and 8 is an output unit.
読取部1,2は同一構成で、いずれも同じ光学ディスク
を光学的に読取るように配置される。但し、補助読取部
２は常に常用読取部１よりｔ秒分先の情報を読取る。従
って、補助読取部２の出力を遅延回路３でｔ秒遅延させ
れば、その遅延出力は常用読取部１の出力と等しくな
る。但し、これは振動によるトラック飛びのない場合で
あり、このトラック飛びが発生すると音飛び検知部４は
検知出力を生じる。そこで、制御部６は該検知出力を受
けると出力切換部５に切替信号を送り、復調部７に与え
る信号を読取部１の出力から遅延回路３の出力に切換え
る。このことで常用読取部１の出力の続きは、音飛びが
発生するｔ秒前に既に読取ってある補助読取部２の同一
位置についての出力に引継がれるので、復調部７の入力
段以後には音飛びの影響は残らない。The reading units 1 and 2 have the same configuration and are arranged so as to optically read the same optical disk. However, the auxiliary reading unit 2 always reads information t seconds ahead of the regular reading unit 1. Therefore, if the output of the auxiliary reading unit 2 is delayed by the delay circuit 3 for t seconds, the delayed output becomes equal to the output of the regular reading unit 1. However, this is a case where there is no track jump due to vibration, and when this track jump occurs, the sound skip detection unit 4 produces a detection output. Therefore, when the control section 6 receives the detection output, it sends a switching signal to the output switching section 5 to switch the signal to be given to the demodulation section 7 from the output of the reading section 1 to the output of the delay circuit 3. As a result, the continuation of the output of the regular reading unit 1 is taken over by the output of the auxiliary reading unit 2 which has already been read at the same position t seconds before the sound skip occurs, so that after the input stage of the demodulation unit 7. The effect of skipping does not remain.
上述した動作で音飛び検知部４が検知出力を生じなく
なったら、制御部６は出力切換部５へ復帰信号を送り、
復調部７への信号を遅延回路３の出力から常用読取部１
の出力に切換える。When the sound skip detection unit 4 does not generate a detection output by the above operation, the control unit 6 sends a return signal to the output switching unit 5,
From the output of the delay circuit 3 to the signal to the demodulation unit 7, the regular reading unit 1
Switch to the output of.
尚、振動による音飛びは読取部1,2に同時に発生する
と考えるのが自然であるから、これがｔ秒以上続くもの
であれば、上述した切換は意味がない。そこで、補助読
取部２の出力を音飛び検知部９で監視し、更にその検知
出力を遅延回路10でｔ秒遅延させる。このようにすれ
ば、音飛び検知回路４が検知出力を生じたとき同時に遅
延回路10が検知出力を生じていれば、その音飛びはｔ秒
以上続いていると判断できるので、この場合制御部６は
ミュート信号を送って出力切換部５の出力をミュートす
る。Note that it is natural to assume that sound skipping due to vibrations occurs simultaneously in the reading units 1 and 2, so that the above switching is meaningless if this continues for t seconds or more. Therefore, the output of the auxiliary reading unit 2 is monitored by the sound skip detecting unit 9, and the detected output is delayed by the delay circuit 10 for t seconds. In this case, if the delay circuit 10 produces a detection output at the same time that the sound skip detection circuit 4 produces a detection output, it can be determined that the sound skip has continued for t seconds or more. 6 sends a mute signal to mute the output of the output switching section 5.
第２図は音飛び検知部4,9に共通の構成図で、20は読
取部出力を増幅するバッファアンプ、21,22は該アンプ
出力のエンベロープを検出するピークホールド回路、23
はコンパレータである。ピークホールド回路21は時定数
τが小さいので読取部出力の輪郭を持つ出力を生ずる。
これに対しピークホールド回路22のτは大きいので読取
部出力の最大値を長時間保つ。そこで、後者の出力を抵
抗R1,R2で適当に分割してコンパレータ23の基準値にす
ると、音飛びによって読取部出力が急激にレベル低下し
たとき、コンパレータ23の出力にパルス状の音飛び検知
出力が得られる。FIG. 2 is a block diagram common to the sound skip detectors 4 and 9, 20 is a buffer amplifier for amplifying the output of the reading unit, 21 and 22 are peak hold circuits for detecting the envelope of the amplifier output, 23
Is a comparator. Since the time constant τ is small, the peak hold circuit 21 produces an output having the contour of the reading section output.
On the other hand, since τ of the peak hold circuit 22 is large, the maximum value of the reading section output is maintained for a long time. Therefore, if the latter output is appropriately divided by the resistors R 1 and R 2 and used as the reference value of the comparator 23, when the output of the reading unit suddenly drops in level due to sound skipping, pulse-like sound skipping occurs in the output of the comparator 23. The detection output is obtained.
以上述べたように本発明によれば、CDプレーヤ等にお
いて振動防止材等を用いることなく、振動による音飛び
を回避できる利点がある。As described above, according to the present invention, there is an advantage that skipping due to vibration can be avoided without using a vibration prevention material or the like in a CD player or the like.
第１図は本発明の一実施例を示す構成図、第２図は音飛
び検知部の構成図である。 図中、１は常用読取部、２は補助読取部、３は遅延回
路、４は音飛び検知部、５は出力切換部、６は制御部、
７は復調部、８は出力部である。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a sound skip detector. In the figure, 1 is a regular reading unit, 2 is an auxiliary reading unit, 3 is a delay circuit, 4 is a skipping detection unit, 5 is an output switching unit, 6 is a control unit,
Reference numeral 7 is a demodulation unit, and 8 is an output unit.
Claims (1)
取る常用読取部と、 該常用読取部の出力から音飛びを検知する音飛び検知部
と、 該常用読取部より所定時間先の情報を読取る補助読取部
と、 該補助読取部で読取った情報を該所定時間だけ遅延させ
る遅延回路と、 常時は該常用読取部の出力を再生させ、前記音飛び検出
部が音飛びを検知したときに該遅延回路の出力を再生さ
せる出力切換部とその制御部とを備えてなることを特徴
とする光学ディスク再生装置。1. A regular reading section for reading information on an optical disc along a track, a sound skip detecting section for detecting skipping from an output of the regular reading section, and information for a predetermined time ahead of the normal reading section. An auxiliary reading unit, a delay circuit that delays the information read by the auxiliary reading unit by the predetermined time, and normally reproduces the output of the regular reading unit, and when the sound skip detecting unit detects a sound skip, An optical disk reproducing apparatus comprising an output switching section for reproducing the output of a delay circuit and a control section thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61259350A JP2527313B2 (en) | 1986-10-30 | 1986-10-30 | Optical disc playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61259350A JP2527313B2 (en) | 1986-10-30 | 1986-10-30 | Optical disc playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63113825A JPS63113825A (en) | 1988-05-18 |
| JP2527313B2 true JP2527313B2 (en) | 1996-08-21 |
Family
ID=17332889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61259350A Expired - Lifetime JP2527313B2 (en) | 1986-10-30 | 1986-10-30 | Optical disc playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2527313B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS592966B2 (en) * | 1976-06-24 | 1984-01-21 | 三菱電機株式会社 | optical information reproducing device |
| JPS58166422U (en) * | 1982-04-30 | 1983-11-05 | 東京シ−ト株式会社 | Automotive interior sheets |
-
1986
- 1986-10-30 JP JP61259350A patent/JP2527313B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63113825A (en) | 1988-05-18 |
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