TWI240258B - Method for detecting a wobble signal - Google Patents

Method for detecting a wobble signal Download PDF

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Publication number
TWI240258B
TWI240258B TW092120932A TW92120932A TWI240258B TW I240258 B TWI240258 B TW I240258B TW 092120932 A TW092120932 A TW 092120932A TW 92120932 A TW92120932 A TW 92120932A TW I240258 B TWI240258 B TW I240258B
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Taiwan
Prior art keywords
signal
patent application
wobble
phase
wobble frequency
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TW092120932A
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English (en)
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TW200402701A (en
Inventor
Christof Ballweg
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Thomson Licensing Sa
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005Reproducing
    • G11B7/0053Reproducing non-user data, e.g. wobbled address, prepits, BCA
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/21Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215Recordable discs
    • G11B2220/216Rewritable discs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537Optical discs
    • G11B2220/2562DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
    • G11B2220/25Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537Optical discs
    • G11B2220/2562DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
    • G11B2220/2575DVD-RAMs
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/24Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24073Tracks
    • G11B7/24082Meandering

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Description

1240258 五、發明説明(3) · 免任何混淆。此法較之先前技術之解決方案,可輸送較大 波幅和較少雜訊。所以,此解決方案之可靠性,對輸入信 號的信號對雜訊比依賴較低。 另外,進一步處理包括相位靈敏性整流。其優點是相 位靈敏性整流對於特殊目的,是充分確立的技術。 按照本發明,比較步驟又包括下列步驟,產生該處理 過合量信號和該處理過差異信號之進一步差異信號。產生 此進/步差異信號是將處理過合量信號和處理過差異信號 加以比較之最容易方式。進一步差異信號直接因輸入信號 内所含擺頻信號與參致信號間的相對相位而定。 比較步驟宜進一步包括將該進一步差異信號,或該處 理過合量信號和該處理過差異信號,經單一擺頻期間之積 合梦驟。藉經單一擺頻周期的積合,積合值與輪入信號的 波幅裏比例。如此亦可容易獲得擺頻信號之信號波幅。輸 出信號的符號表示輸入信號的相位。由於輸出信號對輸入 信號波幅之比例,輸出信號亦可用來控制輸入信號的波 幅。 、 本發明方法宜再包括參玫信號計算步驟。使用擺頻週 期内的相位作為輸入參變數,即可容易計算參 資訊由鎖入擺頻佗號内的PLL (相位鎖定迴路)可撂。盔 算正弦或餘弦參玫信號,可用c〇RDIC演算。 " 另外,本發明方法又包括參玫信號在查 驟。 樣0
如果PLL以數位實現,已知可在信號内-何處表内儲羊 相對應參致值可儲存於查索表内。 處對^號 右擺頻信5
1240258 五、發明說明(4) ‘ 擺頻週期内取樣3 2次,則查索表即含有3 2次鍵入。 按照本發明又一要旨,擺頻信號之檢測方法包括對具 有不同擺頻頻率的複數參玫信號,並行進行本發明方法。 以高密度光碟而言,資訊最好使用複數不同擺頻頻率,尤 其是三種不同擺頻頻率,編碼入擺頻信號内。以此等頻率 各平行進行本發明方法,得以可靠檢測所編碼資訊。 記錄媒體讀/寫裝置宜包括進行本發明方法用之機構 。此種裝置在檢測擺頻信號方面非常可靠。即使在光學記 錄媒體的記錄面積内,可安全恢復位址資訊。 實施方式 為更佳瞭解本發明起見,在如下參見附圖說明有益造 型中特定具體例。須知本發明不限於此等具體例,而特定 之特點可權宜組合和/或修飾,不違本發明之範圍。 DVD + RW碟片之軌道擺頻,基本上為單調正弦波。只有 少部份執道擺頻是相調,並含有位址位元、輔助資料位元 和同位位元。此部份在預溝(ADIP)内稱為位址。第1圖表 示此ADIP部份跨越三個擺頻週期P1,P2,P3之擺頻信號WS。 由圖可見,在第二擺頻週期P2内的擺頻信號WS被反相,並 構成負擺頻。正、負擺頻的順序用來把資訊編碼於ADIP内 。為將此資訊解碼,必須確實檢測正、負擺頻。 第2圖表示本發明方法之方塊圖。輸入信號IS與參玫 信號RS比較,後者是由參玫信號發生器8所產生,其相位 和頻率相當於所需擺頻信號。為此目的,加器1把輸入信 號IS和參玫信號RS相加,以產生合量信號S1。加器2把輸 i^aii hi 第8頁 1240258 五、發明說明(5) * 入信號IS和負參玫信號RS相加,得相差信號S2。視輸入信 號I S和參玫信號RS間之相對相位,二信號s 1,S2之一有較 大值,而另一信號S2,S1有較小值。若輸入信號! s的相位 與參玫信號RS —致,或信號I S,RS間之相位為π的整數倍 ,則此效果最明顯。鎖定於擺頻信號W S的二絕對值計算器 3,4 ’分別計算合量信號S1的絕對值信號a 1,以及相差信 號S 2的絕對值信號A 2。又一加器5把合量信號s 1的絕對值 #號A1和相差彳§號S 2的負絕對值信號a 2相加,產生進一步 相差信號DS。此進一步相差信號DS利用積合器6在擺頻週 期内積合,得輸出信號0S。積合後,輸出信號值視輸入信 號I S内所含擺頻信號WS的波幅和相位而定。 第3圖表示本發明又一具體例之方塊圖。代替進一步 相差信號DS之積合,二積合器6, 7分別用來積合合量信號 S1的絕對值信號A1以及相差信號s 2的絕對值信號A 2。以此 方式,可得二積合信號II和12,形成輸出信號0S之基礎。 輸出信號0S是利用加器5把第一積合信號II和負第二積合 信號I 2相加而產生。 第4圖表示光學記錄媒體14讀/寫裝置。此裝置包括 進行本發明方法用之機構18b,以獲得輸出信號0S,可將 光學記錄媒體14的擺頻軌道16内所含資訊解碼。從光源1〇 射出的掃描光束2 0利用準直儀11準直,並利用光束分裂器 12轉向。物鏡13把掃描光束20聚焦在帶有資訊的光學記錄 媒體14之一層15的擺頻軌道16上。從帶有資訊之層15反射 的掃描光束20,利用物鏡13準直,利用造象單位17在光檢
第9頁 1240258 五、發明說明(6) ^ 波器9上造象。來自光檢波器9的信號以評鑑單位1 8評鑑。 評鑑單位包括追蹤誤差信號TE發生機構18a,該信號供至 追蹤調整器19,確保掃描光束20盡量接近擺頻執道16的執 道中心運動。評鑑單位又包括機構1 8b,供檢測擺頻信號 WS並產生輸出信號OS,為擺頻信號WS内所含資訊解碼所 需0 第10頁

Claims (1)

1240258 六、申巧專利範圍 1 · 一種擺頻信號之檢測方法,其 驟: 特徵為, 包括 (RS,;包括擺頻信號(^)的輸入信號(1 加以比較,參玫信號(RS)的相位 與參玟信 擺頻信號;以;5 頻率相當於所 下步 位者 把輸出信號(0S)輸出,以指示擺頻信號 f虎 所需 之波幅和相 •如申喷專利範圍第1項之方法,其中比較步驟包括·· 產生輪入信號(IS)和參玫信號(RS)之合量信號(S1) 和差異信號(S2)者。 3·如申請專利範圍第2項之方法,其中比較步驟又包 括: 進一步處理該合量信號(S1)和該相差信號(S2)者。 4·如申請專利範圍第3項之方法,其中進一步處理包 括絕對值計算和相位靈敏性整流之一者。 5 ·如申請專利範圍第3項之方法,其中比較步驟又包 括產生該處理過合量信號(S1)和該處理過差異信號(S2)之 進一步差異信號(DS)者。
6·如申請專利範圍第3項之方法,其中比較步驟又包 括把該進一步不同信號(DS),或該進一步處理過合量信號 (A1)及該進一步處理過差異信號(A2),在擺頻週期加以積 合者。 7 ·如申請專利範圍第1項之方法,又包括步驟為: 計算參致信號(R S )者。
第12頁 1240258 六、申請專利範圍 8. 如申請專利範圍第1項之方法,又包括步驟為: 把參玫信號(RS)儲存於表内者。 9. 一種擺頻信號之檢測方法,其特徵為,包括對具有 不同擺頻頻率之複數參政信號(RS ),並行進行申請專利範 圍第1項之方法者。 1 0. —種記錄媒體之讀/寫裝置,其特徵為,包括機 構以進行申請專利範圍第1項之方法者。
第13頁
TW092120932A 2002-08-06 2003-07-31 Method for detecting a wobble signal TWI240258B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02017521A EP1388850A1 (en) 2002-08-06 2002-08-06 Method for detecting a wobble signal

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TW200402701A TW200402701A (en) 2004-02-16
TWI240258B true TWI240258B (en) 2005-09-21

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US (1) US20040027956A1 (zh)
EP (1) EP1388850A1 (zh)
JP (1) JP2004134054A (zh)
KR (1) KR20040014203A (zh)
CN (1) CN100346398C (zh)
DE (1) DE60302949T2 (zh)
TW (1) TWI240258B (zh)

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KR100685397B1 (ko) * 2004-08-09 2007-02-22 삼성에스디아이 주식회사 평판 표시 소자 및 그 제조방법
EP1742221A1 (en) * 2005-06-28 2007-01-10 Deutsche Thomson-Brandt Gmbh Method and circuit for evaluating a wobble signal

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Also Published As

Publication number Publication date
JP2004134054A (ja) 2004-04-30
DE60302949D1 (de) 2006-02-02
EP1388850A1 (en) 2004-02-11
US20040027956A1 (en) 2004-02-12
KR20040014203A (ko) 2004-02-14
CN1487508A (zh) 2004-04-07
TW200402701A (en) 2004-02-16
DE60302949T2 (de) 2006-07-27
CN100346398C (zh) 2007-10-31

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