JP3939615B2 - Information recording medium and reproducing apparatus - Google Patents

Description

【０２０１】
オーディオＤＶＤでは、非圧縮のＬＰＣＭ音声を必ず記録する必要があるので、標本化周波数が高い場合、もしくはチャンネル数が多い場合、必要とされるデータ転送レートが高い。従ってオーディオ情報を主体とし、主に非圧縮のＬＰＣＭ音声を複数記録しようとする場合には、このストリームの多重方式は、不適当といえる。
【０２０２】
また、オーディオフォーマットには、録音用としての機能や、現在使用されているスタジオ機器との整合性を重視し、特に記録時の処理が簡単なことが求められている。ＤＶＤビデオフォーマットのようにビデオストリームを始めとし、複数の可変レートのストリームを多重する構造を持つことになると、データ中に管理情報を置かなくてはならない。また、この管理情報には、前後数分のデータに関するアドレス情報を記述する構造となっており、録音装置として考えると、前後の数分のデータがそろわないとディスクに記録することができない。従って簡易な録音機を構成できないといった問題を生じる。また、現在のスタジオ機器以外に、新たなオーサリング装置が必要となる。といった問題もある。
【０２０３】
（5.2.2）複数のブロックＡＯＴＴ＿ＡＯＢＳ
オーディオ情報だけを記録する場合は、上記の問題点を解決することを、より重要な課題とし、オーディオフォーマットとして求められる構造を採ることとした。そこで、一つの実体情報（ＡＯＴＴ＿ＡＯＢ）には、１種類のオーディオストリームしか記録しないこととし、種類の異なる複数のオーディオ情報を記録する場合には、別の実体情報（ＡＯＴＴ＿ＡＯＢ）としてディスク上別のエリアに分離して記録することとした。このようにすることで、一つのオーディオ情報のデータ転送レートが、１０．０８Ｍｂｐｓ以下であれば、いくつでも記録できる構造となる。また１種類のオーディオストリームしか記録しないため、そのオーディオ情報が非圧縮のＬＰＣＭのように固定レートのデータで在れば、データ中に管理情報を置く必要もなく、記録時の処理も簡単なものとなる。
【０２０４】
また２ｃｈのオーディオ情報とマルチチャンネルのオーディオ情報とを同時に再生する必要はなく、また瞬時に切り換える必要性もあまりない。従って別の実体情報に分離して記録した場合には、再生時の切り換えに伴う処理が、複雑なものになるが、大きな問題ではないといえる。
【０２０５】
しかし、この場合、複数の実体情報を、同一のタイトルとして扱う仕組みが必要となる。また同じ仕組みで、ＡＯＴＴ＿ＶＯＢに複数のストリームとして記録されたオーディオ情報も統一的に扱う必要がある。
【０２０６】
（5.3）オーディオセレクション
以上のように、種類の異なる複数のオーディオ情報を記録する方法には、大きく分けて２つの方法があるが、夫々において問題がある。そこで、本発明は、再生制御情報に次のような論理構造を持たせることにより、夫々の方法における問題を解決し、適切なオーディオセレクションを可能にした。ここで、オーディオセレクションとは、同一タイトルとして扱う必要がある、ディスク上の異なるエリアに記録されている種類の異なる複数のオーディオ情報を切り換えるこという。
【０２０７】
まず、種類の異なる複数のオーディオ情報を、別の実体情報（ＡＯＴＴ＿ＡＯＢ）としてディスク上別のエリアに分離して記録する方法を採る場合には、図１０に示すように、オーディオ実体情報の記録方式（図１０の場合には、録音形態：２ｃｈとマルチｃｈ）の異なる複数の各オーディオ実体情報（この場合はオーディオタイトルであるので、ＡＯＴＴ＿ＡＯＢ２１０（ＡＯＢ＃１，ＡＯＢ＃２））の再生に対して、夫々のＡＯＢ２１０を構成するセル２２０を、第２区分単位としてのプラグラム３０１の単位に区分する。また、夫々のプログラム３０１を、第２区分情報としてのプログラム番号（＃１，＃２，＃３，…）により識別する。このプログラム３０１とは、トラック２６０に対応した再生単位であり、例えば１曲分に相当する。従って、夫々のオーディオ実体情報（ＡＯＴＴ＿ＡＯＢ２１０（ＡＯＢ＃１，ＡＯＢ＃２））は、記録方式が異なるものの、内容は同一であるから、夫々のオーディオ実体情報についてのプログラム３０１の数及び順序は等しくなる。図１０の場合は、夫々、プログラム＃１，＃２，＃３で構成されることになる。
【０２０８】
次に、夫々のプログラム３０１（プログラム＃１，＃２，＃３）を、管理情報としてのブロック化された夫々別のＰＧＣ３００（ＰＧＣ＃１，ＰＧＣ＃２）によりまとめる。そして、これらのＰＧＣ３００（ＰＧＣ＃１，ＰＧＣ＃２）を、同一のトラック２６１（図１０の場合はトラック＃１）に対応させることにより、同一のトラック２６０（＃１）に対して、夫々の記録方式の異なるオーディオ実体情報を含むプログラム３０１（プログラム＃１，＃２，＃３）を関係付けている。つまり、本発明は、第２区分情報としてのプログラム番号により識別されるプログラム単位のオーディオ実体情報であって、夫々記録方式の異なるオーディオ実体情報を、第１区分情報としてのトラック番号（＃１，＃２，＃３，…）により識別される第１区分単位としてのトラック２６１であって、同一のトラック番号を有する同一のトラック２６１に、管理情報としてのブロック化された別々のＰＧＣ３００を用いて関係付けている。
【０２０９】
このようにすることにより、種類の異なる複数のオーディオ情報を、別の実体情報（ＡＯＴＴ＿ＡＯＢ）としてディスク上別のエリアに分離して記録する方法を採る場合でも、ユーザからは、同一のタイトル、同一の曲と認識され、ユーザの指示又は再生装置の能力にあった記録方式のオーディオ実体情報を管理するＰＧＣ３００を選択することで、種類の異なる複数のオーディオ実体情報を統一的に扱うことができる。
【０２１０】
次に、ビデオフォーマットの記録領域に、ストリーム多重方式により記録方式の異なるオーディオ実体情報を記録する方法を採る場合には、図１１に示すように、 オーディオ実体情報ＡＯＴＴ＿ＶＯＢ１０（図１１の場合はＶＯＢ＃１）を、ブロック化され、かつ夫々の記録方式（図１１の場合には録音形態：２ｃｈとマルチｃｈ）ごとに設けられた別々のＰＧＣ３００（図１１の場合はＰＧＣ＃１，＃２）を用いて、同一のトラック２６１（図１１の場合はトラック＃１）に関係つける。なお、夫々のＰＧＣ３００が、プログラム３０１（図１１の場合はプログラム＃１，＃２，＃３）を管理する点は、図１０の場合と同様である。
【０２１１】
このような論理構造を採ることにより、夫々のＰＧＣ３００により、夫々のオーディオ実体情報の記録方式が管理されているので、オーディオストリーム内のナビゲーション情報を直接参照することなく、ＰＧＣ３００を記録方式に応じて選択するだけで、所望の記録方式のオーディオ情報を適切に再生することができる。つまり、本発明によれば、ビデオフォーマットで記録されたオーディオ情報を、オーディオフォーマットの制御情報で管理することができる。勿論、この場合でも、ユーザからは、同一のタイトル、同一の曲と認識される。従って、ユーザの指示又は再生装置の能力にあったＰＧＣを選択することで、種類の異なる複数のオーディオ情報を統一的に扱うことができる。
【０２１２】
以上のように、本発明によれば、オーディオ情報が、ＡＯＴＴ＿ＡＯＢに記録されている場合（オーディオタイトルを再生する場合）でも、ＡＯＴＴ＿ＶＯＢに記録されている場合（画像音声両用タイトルを再生する場合）でも、同じ仕組みでオーディオセレクションを行うことができ、本発明は、オーディオタイトル（ＡＯＴＴ）又は、画像音声両用タイトル（ＡＶＴＴ／ＡＯＴＴ）をオーディオプレーヤで再生する場合に有効である。
【０２１３】
さらに図１２，１３を用いて具体的な例で、このオーディオセレクションがどのように行われるかを説明する。
【０２１４】
（5.3.1）オーディオタイトルにおけるオーディオセレクション
最初に、オーディオタイトルをオーディオプレーヤ又はコンパチプレーヤで再生する場合を説明する。ここで、全てのタイトルグループは、１つのタイトルで構成されているものとする。再生装置が２ｃｈ専用であるか、ユーザが２ｃｈ再生を選択するように設定しているとする。また、ユーザがタイトルグループ２６２（＃ｊ）の再生を指示したとする。
【０２１５】
前述したように、タイトルグループ２６２に対応するタイトルのＡＴＳ番号とＡＴＳタイトル番号がＡＯＴＴ＿ＳＲＰ２４７を参照し取得する（図８参照）。その結果ＡＴＳ番号は＃２、ＡＴＳタイトル番号は＃３だったとする。ここまでの流れは（4.5.1.1）オーディオプレーヤの場合、及び（4.5.1.2）コンパチブルプレーヤの場合、で説明したとおりである。
【０２１６】
次にＡＴＳ＃２のＡＴＳＩ２１１を読み取り、ＡＴＳＩ＿ＭＡＴ２７０に書かれている属性情報を記憶する（図１２、「Ｐ１２（１）」で示すパスを参照）。この段階では、再生しようとしているタイトルの各トラックの属性を特定することはできない。とりあえず全ての属性情報を記憶しておく。
【０２１７】
続いてＡＴＳ＿ＰＧＣＩＴ２７１を読み、この中のＰＧＣＩサーチポインタ（ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ）２７３を読みにいく（図１２、「Ｐ１２（２）」で示すパスを参照）。このテーブルの中でＡＴＳタイトル番号（ＡＴＳ＿ＴＴＮ）が＃３のＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３を探す。この場合、第１区分情報としてのＡＴＳタイトル番号が＃３のＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３が二つあり（＃３と＃４）、ＰＧＣブロックを構成していることがわかる。そこで、どちらのＰＧＣ３００を選択するかを判断する。この場合、再生装置が２ｃｈ専用であるか、又はユーザが２ｃｈ再生を選択するように設定されているので、ブロックタイプの項目を見る。ここに、チャンネル数の違いによりＰＧＣブロックを組んでいると書かれているので、次にＡｕｄｉｏ ｃｈａｎｎｅｌｓの項目２８４（図９及び図１２参照）をみて２ｃｈ以下と書かれている方のＰＧＣ３００を選択する。そして選択したＰＧＣ３００の再生制御情報ＡＴＳ＿ＰＧＣＩ２７６の書かれているアドレス（この場合は１６３８４）を取得し、そこへジャンプし、再生制御情報を読み取り、記憶する（図１２、「Ｐ１２（３）」で示すパスを参照）。
【０２１８】
再生制御情報の中には、トラック２６０に対応する、プログラム３０１に関する情報テーブルと、セル２２０に関する情報テーブルとがある。タイトル先頭から再生を開始する場合には、プログラム＃１のＡＴＳ＿ＰＧＩを見て、プログラム＃１の属性を特定する情報と先に記憶した属性情報を使い、プログラム＃１の属性を特定する。この属性に従ってオーディオデコーダをセットする。次にＡＴＳ＿ＰＧＩから、プログラム＃１の先頭セル番号を読み（この場合、再生しようとしているのがプログラム＃１なので、当然その先頭セル番号も＃１である。）、その番号に対応するＡＴＳ＿Ｃ＿ＰＢＩからセル２２０の記録されているアドレスを読み取り、そこへジャンプし再生を開始する（図１２、「Ｐ１２（４）」で示すパスを参照）。
【０２１９】
通常再生の場合は、次のプログラムになるまで、再生中のメモリに記憶されているＡＴＳ＿Ｃ＿ＰＢＩを使ってセルの再生を続ける。プログラムの再生が終わったら、これもメモリ中のＡＴＳ＿ＰＧＩと属性情報を使って、次のプログラム再生のための一連の処理を行い再生を開始する。この動作をタイトル終了まで繰り返す。従って前述したように、管理情報内の全ての属性情報と再生制御情報ＡＴＳ＿ＰＧＣＩを記憶していなければならない。
【０２２０】
次に、再生装置がマルチチャンネル再生に対応していて、なおかつユーザがマルチチャンネル再生を選択するように設定しているとする。また、ユーザがタイトルグループ２６２（＃ｊ）の再生を指示したとする。
【０２２１】
タイトルグループ２６２に対応するタイトルのＡＴＳ番号＃２とＡＴＳタイトル番号＃３を取得し、ＡＴＳ＃２のＡＴＳＩ２１１を読みに行く。ここまでは２ｃｈ再生を選択した場合と同じである（図１２、「Ｐ１Ｍ（１）」で示すパスを参照）。また、ＡＴＳＩ２１１のＡＴＳＩ＿ＭＡＴ２７０に書かれている属性情報を記憶し、ＡＴＳ＿ＰＧＣＩＴ２７１を読み、この中のＡＴＳ＿ＰＧＣサーチポインタ２７３を読みにいく（図１２、「Ｐ１Ｍ（２）」で示すパスを参照）。ここまでの処理も２ｃｈ再生を選択した場合と変わりはない。
【０２２２】
このテーブルの中でＡＴＳタイトル番号（ＡＴＳ＿ＴＴＮ）が＃３のＡＴＳ＿ＰＧＣ＿ＳＲＰ２７３を探す。この場合ＡＴＳタイトル番号が＃３のＡＴＳ＿ＰＧＣＩ＿ＳＲＰが二つあり（＃３と＃４）ＰＧＣブロックを構成していることがわかる。そこで、どちらのＰＧＣ３００を選択するかを判断する。この場合、再生装置がマルチチャンネル再生に対応していて、なおかつユーザがマルチチャンネル再生を選択するように設定しているので、ブロックタイプの項目を見る。ここに、チャンネル数の違いによりＰＧＣブロックを組んでいると書かれているので、次にＡｕｄｉｏ ｃｈａｎｎｅｌｓの項目２８４をみて３ｃｈ以上と書かれている方のＰＧＣ３００を選択する。そして選択したＰＧＣ３００の再生制御情報ＡＴＳ＿ＰＧＣＩ２７６の書かれているアドレス（この場合は２４５７６）を取得し、そこへジャンプし、再生制御情報を読み取り、記憶する（図１２、「Ｐ１Ｍ（３）」で示すパスを参照）。
【０２２３】
以後の処理は、処理するＰＧＣ３００が異なり、再生する実体情報が異なる以外、２ｃｈ再生を選択した場合と基本的に同じである。再生制御情報の中の、プログラムに関する情報テーブルからプログラム＃１のＡＴＳ＿ＰＧＩを見て、プログラム＃１の属性を特定し、オーディオデコーダをセットする。次にＡＴＳ＿ＰＧＩから、プログラム＃１の先頭セル番号＃１のＡＴＳ＿Ｃ＿ＰＢＩを読み、セル＃１の記録されているアドレスを読み取り、そこへジャンプし再生を開始する（図１２、「Ｐ１Ｍ（４）」で示すパスを参照）。
【０２２４】
（5.3.2）画像音声両用タイトルにおけるオーディオセレクション
画像音声両用タイトルをオーディオプレーヤで再生する場合を説明する。ここで、全てのタイトルグループ２６２は、１つのタイトルで構成されているものとする。再生装置がＬＰＣＭ専用であるか、ユーザがＬＰＣＭの再生を選択するように設定しているとする。また、ユーザがタイトルグループ２６２（＃ｊ）の再生を指示したとする。
【０２２５】
前述したように、タイトルグループ２６２に対応するタイトル２６１のＡＴＳ番号とＡＴＳタイトル番号をＡＯＴＴ＿ＳＲＰ２４７を参照し、取得する。その結果ＡＴＳ番号は＃２、ＡＴＳタイトル番号は、＃４だったとする。ここまでの流れは（4.5.3.1）オーディオプレーヤの場合で説明したとおりである。
【０２２６】
次にＡＴＳ＃２のＡＴＳＩ２１２を読み取り、ＡＴＳＩ＿ＭＡＴ２７０に書かれている属性情報を記憶する（図１３、「Ｐ２Ｌ（１）」で示すパスを参照）。この段階では、再生しようとしているタイトルの各トラックの属性を特定することはできない。とりあえず全ての属性情報を記憶しておく。また、この場合、画像音声両用タイトルを再生しようとしているので、対応するＡＴＳ２０３は、実体情報の無い、ナビゲーション情報だけのＡＴＳとなっている。
【０２２７】
続いてＡＴＳ＿ＰＧＣＩＴ２７１を読み、この中のＰＧＣＩサーチポインタ２７３を読みにいく（図１３、「Ｐ２Ｌ（２）」で示すパスを参照）。このテーブルの中でＡＴＳタイトル番号（ＡＴＳ＿ＴＴＮ）が＃４のＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３を探す。この場合ＡＴＳタイトル番号が＃４のＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３が二つあり（＃４と＃５）ＰＧＣブロックを構成していることがわかる。そこで、どちらのＰＧＣ３００を選択するか判断する。
【０２２８】
この場合、再生装置がＬＰＣＭ専用であるか、ユーザがＬＰＣＭの再生を選択するように設定しているので、ブッロクタイプの項目を見る。ここに、チャンネル数及び符号化方式の違いによりＰＧＣブロックを組んでいると書かれているので、次にＡｕｄｉｏ ｃｏｄｉｎｇ ｍｏｄｅの項目２８５をみてＬＰＣＭと書かれている方のＰＧＣ３００を選択する。
【０２２９】
次に、選択したＰＧＣの再生制御情報ＡＴＳ＿ＰＧＣＩ２７６の書かれているアドレス（この場合は２４５７６）を取得し、そこへジャンプし、再生制御情報を読みとり、記憶する（図１３、「Ｐ２Ｌ（３）」で示すパスを参照）。
【０２３０】
再生制御情報の中には、トラック２６１に対応する、プログラム３０１に関する情報テーブルと、セル２２０に関する情報テーブルとがある。タイトル先頭から再生を開始する場合には、プログラム＃１のＡＴＳ＿ＰＧＩを見て、プログラム＃１の属性を特定する情報と先に記憶した属性情報を使って、プログラム＃１の属性を特定する。この属性に従ってオーディオデコーダをセットする。次にＡＴＳ＿ＰＧＩから、プログラム＃１の先頭セル番号を読み（この場合、再生しようとしているのがプログラム＃１なので、当然その先頭セル番号も＃１である。）、その番号に対応するＡＴＳ＿Ｃ＿ＰＢＩからセルの記録されているアドレスを読み取り、そこへジャンプし再生を開始する（図１３、「Ｐ２Ｌ（４）」で示すパスを参照）。
【０２３１】
通常再生の場合は、次のプログラムになるまで、再生中のメモリに記憶されているＡＴＳ＿Ｃ＿ＰＢＩを使ってセルの再生を続ける。プログラムの再生が終わったら、これもメモリ中のＡＴＳ＿ＰＧＩと属性情報を使って、次のプログラム再生のための一連の処理を行い再生を開始する。この動作をタイトル終了まで繰り返す。従って前述したように、管理情報内の全ての属性情報と再生制御情報ＡＴＳ＿ＰＧＣＩを記憶していなければならない。
【０２３２】
次に、再生装置が、マルチチャンネル再生及びＡＣ−３（符号化方式の一種：Ｄｏｌｂｙ Ｄｉｇｉｔａｌ）に対応していて、ユーザがＡＣ−３の再生を選択するように設定しているとする。また、ユーザがタイトルグループ２６２（＃ｊ）の再生を指示したとする。
【０２３３】
タイトルグループ２６２に対応するタイトル２６１のＡＴＳ番号＃２とＡＴＳタイトル番号＃４を取得し、ＡＴＳ＃２のＡＴＳＩ２１１を読みに行く。ここまではＬＰＣＭ再生を選択した場合と同じである（図１３、「Ｐ２Ａ（１）」で示すパスを参照）。また、ＡＴＳＩ２１１のＡＴＳ＿ＭＡＴ２７０に書かれている属性情報を記憶し、ＡＴＳ＿ＰＧＣＩＴ２７１を読み、この中のＡＴＳ＿ＰＧＣサーチポインタ２７３を読みにいく（図１３、「Ｐ２Ａ（２）」で示すパスを参照）。ここまでの処理もＬＰＣＭ再生を選択した場合と変わりはない。
【０２３４】
このテーブルの中でＡＴＳタイトル番号（ＡＴＳ＿ＴＴＮ）が＃４のＰＧＣ３００を探す。この場合ＡＴＳタイトル番号が＃４のＰＧＣが二つありＰＧＣブロックを構成していることがわかる。そこで、どちらのＰＧＣ３００を選択するか判断する。
【０２３５】
この場合、再生装置がマルチチャンネル再生及びＡＣ−３に対応していて、ユーザがＡＣ−３の再生を選択するように設定しているとするので、ブロックタイプの項目を見る。ここに、チャンネル数及び符号化方式の違いによりＰＧＣブロックを組んでいると書かれているので、次にＡｕｄｉｏ ｃｏｄｉｎｇ ｍｏｄｅの項目２８５をみてＡＣ−３と書かれている方のＰＧＣを選択する。そして選択したＰＧＣの再生制御情報ＡＴＳ＿ＰＧＣＩ２７６の書かれているアドレス（この場合は３２７６８）を取得し、そこへジャンプし、再生制御情報を読み取り、記憶する（図１３、「Ｐ２Ａ（３）」で示すパスを参照）。
【０２３６】
以後の処理は、処理するＰＧＣが異なり、再生するストリームが異なる以外、ＬＰＣＭ再生を選択した場合と基本的に同じである。再生制御情報の中の、プログラムに関する情報テーブルからプログラム＃１のＡＴＳ＿ＰＧＩを見て、ＰＧ＃１の属性を特定し、オーディオデコーダをセットする。次にＡＴＳ＿ＰＧＩから、プログラム＃１の先頭セル番号＃１のＡＴＳ＿Ｃ＿ＰＢＩを読み、セル＃１の記録されているアドレスを読み取り、そこへジャンプし再生を開始する（図１３、「Ｐ２Ａ（４）」で示すパスを参照）。但し、この場合再生する実体情報（ＡＯＴＴ ＶＯＢ）が同じなので、ジャンプ先のアドレスも、ＬＰＣＭの再生を選択した場合と同じとなる。
【０２３７】
（６）再生装置
（6.1）ビデオＤＶＤプレーヤ
図１４に示すように、実施の形態に係るビデオＤＶＤプレーヤは、ピックアップ８０と、復調訂正部８１と、ストリームスイッチ８２及び８４と、トラックバッファ８３と、システムバッファ８５と、デマルチプレクサ８６と、ＶＢＶ（Video Buffer Verifier ）バッファ８７と、ビデオデコーダ８８と、サブピクチャバッファ８９と、サブピクチャデコーダ９０と、混合器９１と、オーディオバッファ９２と、オーディオデコーダ９３と、入力部９８と、ディスプレイ９９と、システムコントローラ１００と、ドライブコントローラ１０１と、スピンドルモータ１０２と、スライダモータ１０３とにより構成されている。なお、図１４に示す構成は、ビデオＤＶＤプレーヤの構成のうち、映像及び音声の再生に関する部分のみを記載したものであり、ピックアップ８０及びスピンドルモータ１０２並びにスライダモータ１０３等をサーボ制御するためのサーボ回路等は従来技術と同様であるので、記載及び細部説明を省略する。
【０２３８】
次に、動作を説明する。
【０２３９】
ピックアップ８０は、図示しないレーザダイオード、ビームスプリッタ、対物レンズ、光検出器等を含み、ＤＶＤ１に対して再生光としての光ビームＢを照射すると共に、当該光ビームＢのＤＶＤ１からの反射光を受光し、ＤＶＤ１上に形成されている情報ピットに対応する検出信号Ｓpを出力する。このとき、光ビームＢがＤＶＤ１上の情報トラックに対して正確に照射されると共に、ＤＶＤ１上の情報記録面で正確に焦点を結ぶように、図示しない対物レンズに対して従来技術と同様の方法によりトラッキングサーボ制御及びフォーカスサーボ制御が施されている。
【０２４０】
ピックアップ８０から出力された検出信号Ｓpは、復調訂正部８１に入力され、復調処理及び誤り訂正処理が行われて復調信号Ｓdmが生成され、ストリームスイッチ８２及びシステムバッファ８５に出力される。
【０２４１】
復調信号Ｓdmが入力されたストリームスイッチ８２は、ドライブコントローラ１０１からのスイッチ信号Ｓsw1 によりその開閉が制御され、閉のときには、入力された復調信号Ｓdmをそのままスルーしてトラックバッファ８３に出力する。一方、ストリームスイッチ８２が開のときには、復調信号Ｓdmは出力されず、不要な情報（信号）がトラックバッファ８３に入力されることがない。
【０２４２】
復調信号Ｓdmが入力されるトラックバッファ８３は、ＦＩＦＯ（First In First Out）メモリ等により構成され、入力された復調信号Ｓdmを一時的に記憶すると共に、ストリームスイッチ８４が閉とされているときには、記憶した復調信号Ｓdmを連続的に出力する。
【０２４３】
連続的に復調信号Ｓdmが入力されるストリームスイッチ８４は、デマルチプレクサ８６における分離処理において、後段の各種バッファがオーバーフローしたり、逆に空になってデコード処理が中断することがないように、システムコントローラ１００からのスイッチ信号Ｓsw2 により開閉が制御される。
【０２４４】
一方、トラックバッファ８３と並行して復調信号Ｓdmが入力されるシステムバッファ８５は、ＤＶＤ１をローディングしたときに最初に検出され、ＤＶＤ１に記録されている情報全体に関する管理情報（ＶＭＧ２等）又はＶＴＳ３毎のＶＴＳ１１を蓄積して制御情報Ｓc としてシステムコントローラ１００に出力すると共に、再生中にナビパック４１毎のＤＳＩデータ５１を一時的に蓄積し、システムコントローラ１００に制御情報Ｓcとして出力する。
【０２４５】
ストリームスイッチ８４を介して復調信号Ｓdmが連続的に入力されたデマルチプレクサ８６においては、当該復調信号Ｓdmから各パック毎にビデオデータ、オーディオデータ、サブピクチャデータ及びナビパック毎のＰＣＩデータを抽出し、ビデオ信号Ｓv 、副映像信号Ｓsp、オーディオ信号Ｓad並びにＰＣＩ信号Ｓpcとして、夫々ＶＢＶバッファ８７、サブピクチャバッファ８９、及びオーディオバッファ９２に出力する。
【０２４６】
このとき、デマルチプレクサ８６は、各パック（オーディオパック４３を含む。）及びパケットからパックヘッダ及びパケットヘッダ等を抽出し、夫々に含まれる情報をヘッダ信号Ｓhdとしてシステムコントローラ１００に出力する。
【０２４７】
ビデオ信号Ｓv が入力されるＶＢＶバッファ８７は、ＦＩＦＯメモリ等により構成され、ビデオ信号Ｓv を一時的に蓄積し、ビデオデコーダ８８に出力する。ＶＢＶバッファ８７は、ＭＰＥＧ２方式により圧縮されているビデオ信号Ｓv における各ピクチャ（図２参照）毎のデータ量のばらつきを補償するためのものである。そして、データ量のばらつきが補償されたビデオ信号Ｓv がビデオデコーダ８８に入力され、ＭＰＥＧ２方式により復調が行われて復調ビデオ信号Ｓvdとして混合器９１に出力される。
【０２４８】
一方、副映像信号Ｓspが入力されるサブピクチャバッファ８９は、入力された副映像信号Ｓspを一時的に蓄積し、サブピクチャデコーダ９０に出力する。サブピクチャバッファ８９は、副映像信号Ｓspに含まれるサブピクチャデータ４４を、当該サブピクチャデータ４４に対応するビデオデータ４２と同期して出力するためのものである。そして、ビデオデータ４２との同期が取られた副映像信号Ｓspがサブピクチャデコーダ９０に入力され、復調が行われて復調副映像信号Ｓspd として混合器９１に出力される。
【０２４９】
ビデオデコーダ８８から出力された復調ビデオ信号Ｓvd及びサブピクチャデコーダ９０から出力された復調副映像信号Ｓspd （対応する復調ビデオ信号Ｓvdとの同期が取れている。）は、混合器９１により混合され、最終的な表示すべき映像信号Ｓvpとして図示しないＣＲＴ（Cathod Ray Tube ）等の表示部に出力される。
【０２５０】
オーディオ信号Ｓadが入力されるオーディオバッファ９２は、ＦＩＦＯメモリ等により構成され、入力されたオーディオ信号Ｓadを一時的に蓄積し、オーディオデコーダ９３に出力する。オーディオバッファ９２は、システムコントローラ１００から出力されるヘッダ制御信号Ｓhcに基づいて、オーディオ信号Ｓadを対応する映像情報を含むビデオ信号Ｓv 又は副映像信号Ｓspに同期して出力させるためのものであり、対応する映像情報の出力状況に応じてオーディオ信号Ｓadを遅延させる。そして、対応する映像情報と同期するように時間調整されたオーディオ信号Ｓadは、オーディオデコーダ９３に出力され、システムコントローラ１００から出力されるヘッダ制御信号Ｓhcに基づいて、リニアＰＣＭ方式における再生処理が施されて復調オーディオ信号Ｓaddとして図示しないスピーカ等に出力される。なお、音楽情報のみを含むオーディオＤＶＤにおいては、映像情報との同期処理は不要である。
【０２５１】
（6.2）オーディオＤＶＤプレーヤ
次に、上述のオーディオＤＶＤプレーヤについて図１５を参照して説明する。図１５に示すように、オーディオＤＶＤプレーヤは図１４に示すビデオＤＶＤプレーヤと比較して、デマルチプレクサ８６の後段の構成が異なるが、それ以外は同一の構成を有する。従って、デマルチプレクサ８６以降の構成部分について説明する。
【０２５２】
ストリームスイッチ８４を介して復調信号Ｓdmが連続的に入力されたデマルチプレクサ８６においては、当該復調信号Ｓdmから各パック毎にオーディオ情報を抽出し、オーディオ信号Ｓadとしてオーディオバッファ９２に出力する。
【０２５３】
オーディオ信号Ｓadが入力されるオーディオバッファ９２は、ＦＩＦＯメモリ等により構成され、入力されたオーディオ信号Ｓadを一時的に蓄積し、オーディオデコーダ９３に出力する。オーディオ信号Ｓadは、オーディオデコーダ９３に入力され、システムコントローラ１００から出力される制御信号Ｓhcに基づいて、リニアＰＣＭ方式における再生処理等が施されて復調オーディオ信号Ｓaddとして図示しないスピーカ等に出力される。
【０２５４】
例えば、リアルタイムテキスト等のリアルタイム情報は、デマルチプレクサからＲＴＩバッファに出力される。ＲＴＩバッファに一時的に蓄積されたデータは、システムコントローラ１００から出力される制御信号Ｓhcに基づいて、ＲＴＩデコーダへと出力され、図示しない表示装置に歌詞等の表示を行う。
【０２５５】
所望の情報へのアクセス直後の再生等において一時的に音声を中断する（ポーズする）必要があることが検出された場合には、システムコントローラ１００からポーズ信号Ｓcaがオーディオデコーダ９３に出力され、当該オーディオデコーダ９３は一時的に復調オーディオ信号Ｓaddの出力を停止する。
【０２５６】
図１６にオーディオデコーダ９３の構成を示す。図示のように、オーディオデコーダ９３は、デジタルフィルタなどを含む信号処理部１２０と、Ｄ／Ａコンバータ１２１と、アンプなどを含むアナログ出力回路１２２と、デジタル出力回路１２３と、ＲＡＭ１２４ａを含むシステムマイコン１２４と、クロック回路１２５と、を備える。
【０２５７】
システムマイコン１２４は、システムコントローラ１００との間で制御信号Ｓｃａを交換し、クロック回路１２５、信号処理部１２０、Ｄ／Ａコンバータ１２１、アナログ出力回路１２２の動作制御を行う。システムマイコン１２４は、内部にＲＡＭ１２４ａを有する。ＲＡＭ１２４ａは、システムコントローラ１００から制御信号Ｓｃａとして供給されるオーディオ属性情報を一時的に記憶する。システムマイコン１２４は、ＲＡＭ１２４ａ内に記憶されたオーディオ属性情報を参照し、その内容をクロック回路１２５及び信号処理部１２０へ供給する。具体的には、システムマイコン１２４は、オーディオ属性情報中のサンプリング周波数情報をクロック回路１２５へ供給する。クロック回路１２５は発振器を有し、指示されたサンプリング周波数に対応するクロック信号ｆｓを信号処理部１２０へ供給する。また、システムマイコン１２４は、オーディオ属性情報中のサンプリング周波数、量子化ビット数、チャンネル数、エンファシスの有無の情報を信号処理部１２０へ供給し、Ｄ／Ａコンバータ１２１へチャンネル数情報を提供する。さらに、システムマイコン１２４はアナログ出力回路１２２へ、各チャンネルの信号の増幅度などの情報を供給する。各チャンネル毎の増幅度の情報は、オーディオ属性情報に含めて、システムコントローラ１００から供給することができる。
【０２５８】
信号処理部１２０は、クロック回路１２５からのクロック信号ｆｓを使用し、システムマイコン１２４から得た符号化方式（リニアＰＣＭまたはドルビーＡＣ３など）、サンプリング周波数、量子化ビット数などの情報に従って、オーディオバッファ９２から供給されるオーディオ信号の復号か、帯域制限などの処理を行い、さらに、エンファシスの有無の情報に従ってディエンファシス処理を行い、Ｄ／Ａコンバータ１２１へ出力する。Ｄ／Ａコンバータ１２１は、システムマイコン１２４から得たチャンネル情報に従って、入力された信号をチャンネル毎に分割し、さらに各チャンネル毎のアナログ信号としてアナログ出力回路１２２へ出力する。また、信号処理部１２０は、デジタル出力回路１２３を介してデジタルオーディオ信号Ｓａｄｄを外部へ出力する。
【０２５９】
（6.3）コンパチブルＤＶＤプレーヤ
コンパチブルＤＶＤプレーヤは、図示しないが、図１５に示すオーディオＤＶ
Ｄプレーヤに、図１４に示すビデオＤＶＤプレーヤにおけるＶＢＶバッファ８７、ビデオデコーダ８８、サブピクチァバッファ８９、サブピクチァデコーダ９０、及び混合器９１を備えると共に、システムコントローラ１００を、ビデオフォーマットとオーディオフォーマットの両方の再生が可能なように構成したものである。
【０２６０】
（７）再生装置におけるオーディオセレクション
再生装置におけるオーディオセレクションとは、オーディオプレーヤがオーディオタイトル又は画像音声両用タイトルを再生する場合に、再生するオーディオ情報の種類を切り換えることをいう。
【０２６１】
オーディオ情報の種類としては、（5.2）オーディオ情報の記録方法で、説明したように主に以下の３種類に分類される。
【０２６２】
ａ．録音状況
ｂ．符号化方式
ｃ．再生形態
（7.1）録音状況（バイノーラル）によりブロックを組んだ場合
録音状況が異なる場合は、装置の能力に関係なくユーザの好みに応じて、常時切り換えればよく、初期設定等の必要はない。またバイノーラル録音のような場合には、以下に示すような切り換え方式を再生装置が実施することも可能である。
【０２６３】
ここで、バイノーラル再生を実現するためのバイノーラル録音について詳しく説明する。
【０２６４】
まず通常のステレオ信号をヘッドホンで再生した場合を考える。例えば、図 （Ａ）に示すように、二つのマイクロホンをコンサートホールの所定位置に配置し、これらのマイクロホンの出力をヘッドホンで再生する。この場合、再生音場は図１７（Ａ）に斜線で示すように聴取者の後頭部にできてしまう。これは、スピーカを用いた通常のステレオ再生信号音場では、音像が完全に一方のスピーカに定位されるために、左右のスピーカのレベル差は約２５ｄＢ必要となるのに対し、ヘッドホン聴取の場合には、約１０ｄＢのレベル差で完全に一方の耳に定位してしまうためである。このように、通常のステレオ録音された音楽をヘッドホンで聴くと、ステレオ感が強く出過ぎ、自然な臨場感が得られないという問題がある。
【０２６５】
これに対し、バイノーラル再生では、実際の人間とほぼ等しい音響インピーダンス及び等しい特性を持つダミーヘッドを用意し、このダミーヘッドの両耳の外耳道周辺にマイクロホンを仕込み、図１７（Ｂ）に示すように、例えばこのダミーヘッドをコンサートホールの客席に置き、ダミーヘッド内のマイクロホンの出力をヘッドホンで再生する。このようなバイノーラル再生を行うと、聴取者の頭の周囲に再生される音場は、図１７（Ａ）の斜線で示した範囲となる。従って、、ヘッドホンあるいはイヤホン等による受聴においてより自然な臨場感を得ることができる。
【０２６６】
このようなバイノーラル再生を実現するために、上述のようなダミーヘッドを用いて音楽の録音を行うのがバイノーラル録音であり、このようなバイノーラル録音された作品と、ステレオ録音された作品の両方を、例えば図１８に示すように、多重してＤＶＤディスクに記録しておくことにより、聴取形態に応じた適切な再生を行うことができる。なお、記録方法は多重方式に限られるものではなく、ステレオ録音されたオーディオ実体情報と、バイノーラル録音されたオーディオ実体情報を、夫々別のＡＯＢ２１０に記録するようにしても良い。
【０２６７】
バイノーラル再生を行うか否かの判定は、再生装置に例えば図１５に点線で示すようにヘッドホンジャック４００を設け、このヘッドホンジャック４００にヘッドホンのプラグが挿入されたか否かにより行うこととした。
【０２６８】
このヘッドホンジャック４００は、例えば図１９のような回路構成となっており、ヘッドホンのプラグとの当接により押し上げられるスイッチ部４０１が、プラグの上部と下部の両方に設けられている。そして、これらのスイッチ部４０１が押し上げられることによって、スイッチ部４０１が開状態となり、プラグが挿入されたことを検出することができる。
【０２６９】
このような構成により、ヘッドホンジャック４００にヘッドホンのプラグが挿入され、ある曲の指定がユーザにより行われると、上述したような手順により、バイノーラル録音されたオーディオ実体情報を管理するＰＧＣ３００が選択され、バイノーラル録音されたオーディオ実体情報が自動的に再生される。
【０２７０】
従って、ユーザは、単にヘッドホンジャック４００にヘッドホンのプラグを挿入するだけで、バイノーラル録音された所望の曲を聴くことができる。
【０２７１】
なお、ヘッドホンジャック４００にヘッドホンのプラグが挿入されたか否かの検出は、再生開始時、再生中等の適宜のタイミングで行うことができる。また、ヘッドホンジャック４００にヘッドホンのプラグが挿入された時に常に倍ノーラル録音されたオーディオ実体情報を選択するのではなく、図１５に示す入力部９８による設定操作により、ユーザが優先順位を設定するように構成しても良い。例えば、ステレオ録音の再生に高い優先順位を設定していた時には、ユーザはヘッドホンでステレオ録音されたオーディオ実体情報を聞くことができる。
【０２７２】
（7.2）符号化方式によりブロックを組んだ場合
符号化方式が異なる場合は、ディスクに記録されているオーディオ情報の符号化方式に、再生装置が対応していないと（対応するデコーダを持っていないと）、音を聞くことができない。このような状態ではユーザが混乱する。従って、全てのディスクでＬＰＣＭのオーディオ情報を記録することと、全ての再生装置がＬＰＣＭの再生ができること、とが決められている。従ってユーザは、どのようなオーディオＤＶＤディスクであっても、ＬＰＣＭ記録されたオーディオ情報だけは、再生することができる。
【０２７３】
一方、現在各種の符号化方式が実用化されている。これらの多くが圧縮符号化方式であり、特にマルチチャンネルを記録する場合に、データを有効に使うことができるといった特徴を持つ。このように目的に応じて各種符号化方式によって記録されたオーディオ情報がある場合、再生装置が対応するデコーダを持っている場合のみ、その中から選択、再生することができる。この場合、再生装置は、ユーザによる一時的な設定、ユーザによる初期設定、再生装置による設定に従って、先に説明したＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の中の Audio coding modeの項目２８５に書かれている符号化方式を示す情報から判断し、図１９に示すフローチャートに従って最適なオーディオ情報を選択し、再生を行う。
【０２７４】
なお、各設定処理は、図１４または図１５に示す入力部９８により行うように構成することができる。更に、設定した情報は、システムコントローラ１００内のメモリに記憶されるように構成することができる。
【０２７５】
また、ＤＶＤディスクを再生装置にセットした際、あるいは再生を開始しようとする際等に、上述したようにＤＶＤディスクに記録された制御情報を、システムコントローラ１００によって読み取り、そのＤＶＤディスクに記録されたオーディオ実体情報の録音形態、再生形態、又は符号化方式等を、ディスプレイ９９に表示するように構成することもできる。このような構成により、ユーザは、そしてＤＶＤディスクにおいて選択可能な設定を適切に知ることができ、適切な選択動作を行うことができる。
【０２７６】
以下、図１９に示すフローチャートに従って、符号化方式を示す情報からＰＧＣを選択する処理の一例を説明する。
【０２７７】
まず、選択処理が開始されると（ステップＳ１）、 ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の読み取りが行われ（ステップＳ２）、 ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の中に記述されている Audio coding modeの項目２８５に書かれている符号化方式を読み取る（ステップＳ３）。次に、再生装置が、読み取った符号化方式による再生を行う能力があるか否かについて判定する（ステップＳ４）。その結果、再生装置には、読み取った符号化方式による再生を行う能力がない場合には（ステップＳ４；Ｎｏ）、再びＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の読み取りからの処理を繰り返す（ステップＳ２〜）。一方、再生装置が、読み取った符号化方式による再生を行う能力がある場合には（ステップＳ４；Ｙｅｓ）、読み取った符号化方式を、ユーザが一時的な設定として選択しているか否かを判定する（ステップＳ５）。この設定は、例えばリモートコントロール装置等により、再生を開始する際に、あるいは再生中に行われるもので、例えば特定の曲については、既存の設定とは異なる符号化方式により再生しようとする場合に行われる。前記判定の結果、読み取った符号化方式を、ユーザが一時的な設定として選択している場合には（ステップＳ５；Ｙｅｓ）、選択処理を終了し、当該ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の示すＰＧＣ３００を選択し、再生を開始する（ステップＳ８）。
【０２７８】
しかし、読み取った符号化方式を、ユーザが一時的な設定として選択していない場合には（ステップＳ５；Ｎｏ）、読み取った符号化方式を、ユーザが初期設定として選択しているか否かを判定する（ステップＳ６）。この初期設定は、再生装置の基本的な符号化方式を、ユーザ自信の好み等に応じて行うものであり、この初期設定を行うと、上述した一時的な設定が行われない限り、全ての曲が初期設定された符号化方式により再生されることになる。つまり、読み取った符号化方式を、ユーザが初期設定として選択している場合には（ステップＳ６；Ｙｅｓ）、選択処理を終了し、当該ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の示すＰＧＣ３００を選択し、再生を開始する（ステップＳ８）。
【０２７９】
また、読み取った符号化方式を、ユーザが初期設定として選択していない場合には（ステップＳ６；Ｎｏ）、読み取った符号化方式が、再生装置の設定として選択しているか否かを判定する（ステップＳ７）。この設定は、再生装置の製造段階において行われるもので、ユーザによる上述した種々の設定が行われない限り、全ての曲がこの設定された符号化方式により再生されることになる。つまり、読み取った符号化方式が、再生装置の設定として選択している場合には（ステップＳ７；Ｙｅｓ）、選択処理を終了し、当該ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の示すＰＧＣを選択し、再生を開始する（ステップＳ８）。
【０２８０】
なお、読み取りデータのエラー等により、読み取った符号化方式が、再生装置の設定としても選択されていない場合には（ステップＳ７；Ｎｏ）、再びＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の読み取りからの処理を繰り返す（ステップ２〜）。
【０２８１】
（7.2）再生形態によりブロックを組んだ場合
ここでいう再生形態の選択とは、２ｃｈ（ステレオ）再生を行うか、又はマルチチャンネル再生を行うかを選択することを意味する。再生装置がマルチチャンネルに対応している場合、マルチチャンネル記録のオーディオ情報を選択し再生することができる。しかし、ユーザがマルチチャンネルを再生できるシステム（複数のアンプとスピーカ）を持っており、そのシステムに当再生装置が接続されている場合のみ、本来のマルチチャンネルとしての再生を行うことができる。従ってこの場合も、ユーザによる一時的な設定、ユーザによる初期設定、再生装置による設定に従って、先に説明したＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３に記述されている Audio channelsの項目２８４に書かれているチャンネル数を示す情報から判断し、先に示したフローチャートと同様な流れに従って、最適なオーディオ情報を選択し、再生を行う。
【０２８２】
（7.3）符号化方式と再生形態によりブロックを組んだ場合
図１２の例でも示したように、ブロック内のオーディオ情報の種類の違いとして、符号化方式と再生形態の両方が異なる場合がある。このような場合には以下のような処理が必要となる。
【０２８３】
再生装置が処理することができる各符号化方式と各再生形態の全ての組み合わせに対して優先順位を設定する。例を表２に示す。このような設定を必要に応じて、ユーザによる一時的な設定、ユーザによる初期設定、再生装置による設定の各設定で可能なようにしておく。
【０２８４】
【表２】

なお、表２においては、表の中の数字が小さいほど優先順位が高いことを意味する。
【０２８５】
この優先順位設定に従って、図２１に示すフローチャートのように最適なオーディオ情報を選択し、再生を行う。以下、図２１に示すフローチャートに従って、最適なオーディオ情報を選択し、再生を行う処理の一例について説明する。
【０２８６】
まず、選択処理が開始されると（ステップＳ１０）、 ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３を取得し（ステップＳ１１）、ブロックタイプに応じて、ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の中のAudio coding modeの項目２８５に記述されている符号化方式と、Audio channelsの項目２８４に記述されている再生形態を読み取る（ステップＳ１２）。次に、再生装置が、読み取った符号化方式及び再生形態の組み合わせによる再生を行う能力があるか否かについて判定する（ステップＳ１３）。その結果、再生装置には、読み取った符号化方式及び再生形態の組み合わせによる再生を行う能力がない場合には（ステップＳ１３；Ｎｏ）、再びＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の読み取りからの処理を繰り返す（ステップＳ１１〜）。一方、再生装置が、読み取った符号化方式及び再生装置の組み合わせによる再生を行う能力がある場合には（ステップＳ１３；Ｙｅｓ）、読み取った符号化方式及び再生装置の組み合わせに対して、ユーザによる一時的な設定として選択することに優先順位が設定されているか否かを判定する（ステップＳ１４）。当該優先順位が設定されている場合には（ステップＳ１４；Ｙｅｓ）、読み取った符号化方式及び再生装置の組み合わせに対して、ユーザによる一時的な設定として選択することに優先順位を、優先順位番号として設定する（ステップＳ１５）。そして、この設定した優先順位番号がブロック内で最も小さいか否かを判定し（ステップＳ１９）、最も小さい場合には（ステップＳ１９；Ｙｅｓ）、選択処理を終了し、当該ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の示すＰＧＣ３００を選択し、再生を開始する（ステップＳ２０）。
【０２８７】
しかし、設定した優先順位番号がブロック内で最も小さい番号ではない場合には（ステップＳ１９；Ｎｏ）、当該ブロックの次のＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の取得からの処理を繰り返す（ステップＳ１１〜）。そして、次の符号化方式及び再生形態の組み合わせについて、上述したように、再生装置に再生能力があるか否かの判定と、ユーザによる一時的な設定として優先順位が設定されているか否かの判定とを行い、判定結果に応じた処理を行う（ステップＳ１３，１４，１５）。
【０２８８】
一方、次の符号化方式及び再生形態の組み合わせについて、ユーザによる一時的な設定として優先順位が設定されていない場合には（ステップＳ１４；Ｎｏ）、当該組み合わせについてユーザによる初期設定として優先順位が設定されているか否かを判定する（ステップＳ１６）。当該優先順位が設定されている場合には（ステップＳ１６；Ｙｅｓ）、読み取った符号化方式及び再生装置の組み合わせに対して、ユーザによる初期設定としての優先順位を、優先順位番号として設定する（ステップＳ１７）。そして、この設定した優先順位番号がブロック内で最も小さいか否かを判定し（ステップＳ１９）、最も小さい場合には（ステップＳ１９；Ｙｅｓ）、選択処理を終了し、当該ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の示すＰＧＣ３００を選択し、再生を開始する（ステップＳ２０）。
【０２８９】
しかし、設定した優先順位番号がブロック内で最も小さい番号ではない場合には（ステップＳ１９；Ｎｏ）、当該ブロックの次のＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の取得からの処理を繰り返す（ステップＳ１１〜）。そして、次の符号化方式及び再生形態の組み合わせについて、上述したように、再生装置に再生能力があるか否かの判定と、ユーザによる一時的な設定として優先順位が設定されているか否かの判定と、ユーザによる初期設定としての優先順位が設定されているか否かの判定とを行い、判定結果に応じた処理を行う（ステップＳ１３，１４，１５，１６，１７）。
【０２９０】
一方、次の符号化方式及び再生形態の組み合わせについて、ユーザによる初期設定として優先順位が設定されていない場合には（ステップＳ１６；Ｎｏ）、当該組み合わせについて再生装置の当初からの初期設定の優先順位を、優先順位番号として設定する（ステップＳ１８）。そして、この設定した優先順位番号がブロック内で最も小さいか否かを判定し（ステップＳ１９）、最も小さい場合には（ステップＳ１９；Ｙｅｓ）、選択処理を終了し、当該ＡＴＳ＿ＰＧＣＩ＿ＳＲＰ２７３の示すＰＧＣ３００を選択し、再生を開始する（ステップＳ２０）。
【０２９１】
以上のように、符号化方式と再生形態の組み合わせに対して、優先順位が設定されている場合には、設定された優先順位の中で最も小さい番号の設定態様として、当該組み合わせに基づくＰＧＣ３００の選択と、当該組み合わせによる再生を行う。
【０２９２】
以上説明したように、各符号化方式、各再生形態の組み合わせに対し、必要に応じて、ユーザによる一時的な設定、ユーザによる初期設定、再生装置による設定、の各設定で優先順位を決めることが可能なようにしておくことにより、種類の異なる複数のオーディオ情報が記録された場合でも、いちいちユーザがその種類を選択することなく、最適なオーディオ情報を選択し再生することができる。
【０２９３】
なお、図２０と図２１を用いて説明した例において、再生装置による再生能力にも適合しておらず、また、何れの設定も選択されていないような指定が行われた場合には、ディスプレイ９９等の表示手段により、警告表示を行うように構成しても良い。
【０２９４】
【発明の効果】
請求項１に記載の情報記録媒体によれば、記録方式の異なる同一内容の音情報を、当該内容の下に、かつ、一の再生単位ごとに管理することができるので、ユーザは前記記録方式の異なる同一内容の音情報であっても、音情報ごとに指定する必要がなく、ユーザに混乱を与えることがない。
【０２９５】
請求項３に記載の情報記録媒体によれば、それぞれの記録方式に応じた再生方式により、音情報を再生する時にも、ユーザに対して違和感を与えることがなく、ユーザに混乱を与えることをより一層確実に防止することができる。
【０２９６】
請求項４に記載の情報記録媒体によれば、記録方式を示す情報に基づいて、前記記録方式の異なる同一内容の複数の音情報から、所望の記録方式の同一内容の音情報が容易に選択されることになる。また、この情報記録媒体を再生しようとする再生装置が、前記所望の記録方式を処理できないものである場合には、例えばユーザによる当該記録方式の指定が無効である旨の警告を容易に行うことができる。
【０２９７】
請求項５に記載の情報記録媒体によれば、ユーザの要求に応じた、あるいは当該情報記録媒体を再生する再生装置の能力に応じた音情報の適切な再生が、ユーザの混乱を招くことなく行われることになる。
【０２９８】
請求項７に記載の情報記録媒体によれば、所望の音情報の記録された記録単位を検索し、検索した記録単位の中に多重された音情報のうちの所望の音情報のみを再生することができる。特に、前記記録方式の異なる同一内容の複数の音情報に対しての前記記録単位の検査は、単一の第１区分情報により示される単一の第１区分単位に基づいて行われるが、前記記録方式の異なる同一内容の複数の第２区分単位の音情報が同一の第１区分単位を構成するので、それぞれの音情報を選択する情報を、第１区分情報レベルの階層に持たせることができる。従って、ＤＶＤビデオフォーマットで記録された音情報を、ＤＶＤオーディオフォーマットに対応した制御情報に基づいて再生することができる。
【０２９９】
請求項８に記載の情報記録媒体によれば、使用状況に応じた適切な再生を行うことが可能となる。
【０３００】
請求項９に記載の再生装置によれば、ユーザが所望の音情報の内容に応じた指定を行うだけで、所定の記録方式の音情報の再生が行われることになる。このように、本発明によれば、情報記録媒体に記録された記録方式の異なる同一内容の音情報を、ユーザに混乱を与えることなく、適切に再生することができる。
【０３０１】
請求項１０に記載の再生装置によれば、ユーザは記録方式に対応する所望の再生方式を指定することが可能であり、ユーザの要求に応じた適切な再生が可能である。
【０３０２】
請求項１１に記載の再生装置によれば、再生方式の変更等のユーザの要求をリアルタイムで音情報の再生に反映させることができ、ユーザの要求に応じたより一層適切な再生が可能である。
【０３０３】
請求項１２に記載の再生装置によれば、再生装置の使用態様等に適合した再生方式をユーザの要求に応じて予め記憶させるこができ、適切な使用環境を提供することができる。
【０３０４】
請求項１３に記載の再生装置によれば、ユーザは、再生装置の能力に応じた適切な記録方式の指定あるいは書き換えが可能である。
【０３０５】
請求項１４に記載の再生装置によれば、ユーザの手を煩わせることなく、その再生装置に適合した再生方式により適切な再生が可能である。
【０３０６】
請求項１５に記載の再生装置によれば、再生装置に適合しない記録方式の選択を防止することができる。また、再生装置に適合した記録方式の選択を行いつつ、最大限ユーザの要求を反映させた適切な再生を行うことができる。
【０３０７】
請求項１６に記載の再生装置によれば、ユーザによる煩雑な操作を不要としつつ、使用状況に応じた適切な再生を行うことが可能である。
【図面の簡単な説明】
【図１】ビデオＤＶＤの物理的構造（物理フォーマット）を示す図である。
【図２】ビデオＤＶＤの論理的構造（論理フォーマット）を示す図である。
【図３】オーディオＤＶＤの物理的構造（物理フォーマット）を示す図である。
【図４】オーディオＤＶＤの論理的構造（論理フォーマット）を示す図である。
【図５】ＤＶＤの種類を示す図である。
【図６】オーディオ・ビデオ両用ＤＶＤの一例を示す図である。
【図７】同一オブジェクトの２重管理の概念を示す図である。
【図８】図６に示すオーディオ・ビデオ両用ＤＶＤについて規定されたナビゲーション情報の例を示す図である。
【図９】ＡＴＳに記録される情報を示す図である。
【図１０】オーディオタイトル再生時のユーザの認識とナビゲーション情報と実体情報の関係を示す図である。
【図１１】画像音声両用タイトル再生時のユーザの認識とナビゲーション情報と実体情報の関係を示す図である。
【図１２】オーディオフォーマットで記録されたＤＶＤディスクのＡＴＳＩに記録される情報を示す図である。
【図１３】オーディオフォーマット及びビデオフォーマットで記録されたＤＶＤディスクのＡＴＳＩに記録される情報を示す図である。
【図１４】ビデオＤＶＤプレーヤの概略構成を示す図である。
【図１５】オーディオＤＶＤプレーヤの概略構成を示す図である。
【図１６】図１５のオーディオＤＶＤプレーヤにおけるオーディオデコーダの構成を示す図である。
【図１７】（Ａ）は通常のステレオ再生された音楽情報をヘッドホンで再生した場合に形成される音場を示す図、（Ｂ）はバイノーラル再生された音楽情報をヘッドホンで再生した場合に形成される音場を示す図である。
【図１８】ステレオ方式により２チャンネル録音されたオーディオパックとバイノーラル方式により２チャンネル録音されたオーディオパックが多重化されていることを示す概念図である。
【図１９】ヘッドホンジャックの回路構成の一例を示す図である。
【図２０】符号化方式を示す情報からＰＧＣを選択する処理の一例を示すフローチャートである。
【図２１】符号化方式と再生形態を組み合わせた情報からＰＧＣを選択する処理の一例を示すフローチャートである。
【符号の説明】
３…ＶＭＧ
１０…ＶＯＢ
１１…ＶＴＳＩ
２０２…ＡＭＧ
２０４…ＳＡＰＰＴ
２１０…ＡＯＢ
２１１…ＡＴＳＩ
２４０…ＡＭＧＩ
２４２…ＡＴＴサーチポインタテーブル
２４３…ＡＯＴＴサーチポインタテーブル
２４５…ＡＴＴサーチポインタ
２４７…ＡＯＴＴサーチポインタ
２５１…ＴＴサーチポインタテーブル
２５４…ＴＴサーチポインタ
２６１…タイトル
３００…ＰＧＣ
３０１…プログラム[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an information recording medium such as a DVD disk on which sound information such as music having a different recording form or reproduction form or encoding method is recorded, and a reproducing apparatus for reproducing sound information from the information recording medium. Is.
[0002]
[Prior art]
Video DVDs (discs conforming to the DVD-Video standard) are known as recording media for recording video information such as movies. Video DVDs are widely used as recording media for video information such as movies because of their large capacity.
[0003]
In addition, audio DVDs (discs conforming to the DVD-Audio standard) have been developed in consideration of recording only audio information such as music, not video information such as movies. This audio DVD can record audio information corresponding to a plurality of CDs (compact discs) on a single audio DVD because of its large capacity as a DVD. In addition to video information such as a movie, it is also possible to record audio information corresponding to the music CD of the soundtrack version of the movie.
[0004]
[Problems to be solved by the invention]
The audio DVD is mainly intended for recording audio information such as music, and is trying to enable multi-channel playback that has never been achieved. Also, not only multi-channel but also 2ch stereo playback is being made possible to achieve high-quality playback that has never been seen before.
[0005]
In such a DVD audio disc, when only multi-channel audio information is recorded, a person having a playback device dedicated to 2ch can only hear a part of the sound, or cannot reproduce it at all. Arise.
[0006]
Therefore, in order to allow a person who has only a playback device dedicated to 2ch to enjoy this disc, it is necessary to record audio information for 2ch playback on the disc together with multi-channel audio information.
[0007]
However, in this case, the two types of audio information are naturally recorded with the same title and the same song. Therefore, if these two types of audio information are recorded on the disc as they are, there is a first problem that two types of titles and songs with the same name exist, resulting in user confusion. This first problem is not only when the playback mode such as the channel is different, but also when the recording mode such as binaural recording is different, or when the encoding method such as AC-3 is different, and further, these playback mode and recording This is a problem that similarly occurs when the form or the combination of encoding methods is different.
[0008]
Next, in the already standardized DVD video format, a plurality of audio information can be recorded simultaneously with image information. For example, for a certain movie, the voice of the original language and the voice of Japanese dubbing can be switched. Similarly, LPCM stereo sound and AC-3 multi-channel sound can be switched in the same title. Accordingly, a plurality of audio information can be handled as the same title and the same music, and the type of audio information to be reproduced can be changed by changing the audio stream.
[0009]
On the other hand, there is a demand for recording image information on an audio DVD as well, and an attempt is made to enable recording of menu and additional information video information. In this case, if a picture is recorded by a method different from the DVD video format, it cannot be compatible with the video format. It is desirable that a video player on the market can reproduce a portion with a picture of an audio disc.
[0010]
Therefore, also from these viewpoints, the structure for recording the entity information with an image needs to be the same structure as the DVD video format.
[0011]
However, for this purpose, it is necessary to multiplex a plurality of types of audio information and record them on the disc as one object. In addition, in order to manage a plurality of streams, it is necessary to put management information in the data. Therefore, when the video format has the same structure as the video format, the processing required for switching at the time of playback by the playback device is small, but the processing at the time of recording becomes complicated.
[0012]
The audio format emphasizes the functions for recording and compatibility with the studio equipment currently used, and it is required that the processing at the time of recording is not complicated, especially management information is placed in the data. No structure is needed.
[0013]
Therefore, two types of structures are required: a structure unique to the DVD audio format when only audio information is recorded, and a structure conforming to the DVD video format when accompanied by an image. In this way, when only audio information is to be reproduced for data of two types of structures, the reproduction control information has two different formats unless it has a common logical structure. There is a second problem that the processing of the apparatus becomes heavy and a uniform operation cannot be provided, resulting in user confusion.
[0014]
The present invention has been made in view of the above points, and even when a plurality of pieces of audio information having different recording forms, reproduction forms, or encoding methods are recorded on a disc, the user is confused. It is a first object to provide an information recording medium that can appropriately reproduce each audio information without giving it, and a reproducing apparatus that can appropriately reproduce each audio information by the information recording medium. .
[0015]
In addition, even in the case of having two types of structures that conform to the DVD video format when accompanied by an image and a structure that is unique to the DVD audio format when only audio information is recorded, the difference in the structure of each disk is conscious A second problem is to provide an information recording medium that can provide an environment for selecting a plurality of types of audio information through a uniform operation without any problem, and a reproducing apparatus that enables appropriate reproduction thereof.
[0016]
[Means for Solving the Problems]
The information recording medium according to claim 1 is a sound information recording area in which a plurality of sound information is recorded, and a control necessary for reproducing the sound information recorded in the sound information recording area in order to solve the problem. And a control information recording area in which information is recorded.
The control information recorded in the control information recording area is an information recording medium, and each of the first information is recorded in order to divide the plurality of sound information recorded in the sound information recording area for each first division unit. In order to divide the first division information for identifying the division unit and the sound information recorded in the sound information recording area for each second division unit as one reproduction unit, the second division unit is identified. Management information associating the second division unit with the first division unit such that two pieces of information and sound information of a plurality of second division units constitute the same first division unit; Search information for searching for second segment information of the plurality of second segments associated with the first segment information, The sound information of the plurality of second division units is recorded as sound information having the same content and different recording methods, Search information corresponding to the second category information of the plurality of second categories associated with the first category information is collectively recorded. It is characterized by that.
[0017]
According to the information recording medium of the first aspect, the playback device reads the first section information as the control information recorded in the control information recording area, and searches for the first section unit to which the desired sound information belongs. Done. Next, the management information corresponding to the first division information indicating the searched first division unit is read, and the second division information related to the first division information is read. With this second segment information, the second segment unit is further searched for the sound information of the first segment unit previously searched, and the sound information is reproduced for each reproduction unit. When the user directly designates the second division unit, the second division unit designated by the same procedure is searched, and only the sound information of the designated second division unit is obtained. Will be played.
[0018]
Further, the second division unit and the first division unit are related by the management information so that sound information of a plurality of second division units constitutes the same first division unit. Further, the sound information of the plurality of second division units is recorded as sound information having the same content and different recording methods. Therefore, even when sound information of different recording methods is reproduced, the above-described search for the first division unit and the search processing for the second division unit are the same for the sound information of each recording method, and the second division unit is continuously detected. The reproduction or the designated second division unit reproduction can be executed by a single process under a single designation. As described above, according to the present invention, sound information having the same content with different recording methods can be managed under the content and for each reproduction unit. Even the sound information of the contents does not need to be specified for each sound information, and the user is not confused.
[0019]
The management information may be provided for each of the second division units as in the information recording medium according to claim 2.
[0020]
The sound information of the plurality of second division units having the same contents and different recording methods is the plurality of second division units having the same contents and different recording methods as in the information recording medium according to claim 3. The playback time of the sound information may be substantially equal. In this case, when sound information is reproduced by a reproduction method according to each recording method, it does not give the user a sense of incongruity, and it is possible to more reliably prevent the user from being confused. it can.
[0021]
The management information may include information indicating the recording method as in the information recording medium according to claim 4. In this case, based on the information indicating the recording method, sound information having the same content in the desired recording method is easily selected from a plurality of pieces of sound information having the same content with different recording methods. In addition, when a playback apparatus that attempts to play back the information recording medium cannot process the desired recording system, for example, a warning that the designation of the recording system by the user is invalid can be easily performed. Can do.
[0022]
The recording method may be any one of a recording form, a reproducing form, an encoding system, or a combination thereof, as in the information recording medium according to claim 5. In this case, appropriate reproduction of the sound information according to the user's request or according to the ability of the reproducing apparatus for reproducing the information recording medium is performed without causing confusion for the user.
[0023]
The management information may include information indicating the number of the first division unit as in the information recording medium according to claim 6.
[0024]
The sound information of the same content with different recording methods may be multiplexed and recorded at the same recording position in the sound information recording area as in the information recording medium according to claim 7. In this case, it is possible to search for the recording unit in which the desired sound information is recorded, and to reproduce only the desired sound information among the sound information multiplexed in the searched recording unit. In particular, the inspection of the recording unit for a plurality of pieces of sound information having the same contents with different recording methods is performed based on a single first division unit indicated by a single first division information. Since the sound information of a plurality of second division units having the same content and different recording methods constitutes the same first division unit, information for selecting each sound information can be provided in the hierarchy of the first division information level. it can. Therefore, the sound information recorded in the DVD video format can be reproduced based on the control information corresponding to the DVD audio format.
[0025]
The recording method may be normal recording and binaural recording as in the information recording medium according to claim 8. In this case, it is possible to perform appropriate reproduction according to the usage situation.
[0026]
In order to solve the above-mentioned problem, the reproducing apparatus according to claim 9 is a sound information recording area in which a plurality of sound information is recorded, and control information necessary for reproducing the sound information recorded in the sound information recording area. Is recorded in the control information recording area, the control information recorded in the control information recording area includes a plurality of sound information recorded in the sound information recording area in a first division unit. In order to divide the sound information recorded in the sound information recording area into second reproduction units as one reproduction unit, the first division information for identifying each first division unit and the sound information recorded in the sound information recording area Second segment information for identifying each second segment unit; Search information for searching for second segment information of the plurality of second segments associated with the first segment information, Management information associating the second partition unit with the first partition unit so that sound information of the plurality of second partition units constitutes the same first partition unit, and the plurality of second partitions Sound information of the unit is recorded as sound information with the same content and different recording methods, Search information corresponding to the second category information of the plurality of second categories associated with the first category information is collectively recorded. A reproducing apparatus for reproducing the sound information in accordance with the control information from an information recording medium, wherein reading means for reading the recorded information recorded on the information recording medium and designation information for designating conditions to be reproduced are input Input means; reading means for reading control information recorded on the information recording medium; selection means for selecting a recording method to be reproduced based on the designation information or setting information stored in the storage means; Replaying means for replaying sound information of a recording method selected by the selection means from a plurality of pieces of sound information having the same different contents based on the control information.
[0027]
According to the reproducing apparatus of the ninth aspect, when the user designates the condition to be reproduced by the input unit, the designation information is input by the input unit. Next, the control information corresponding to the designation information input in this way is read from the information recording medium by the reading means. In addition, based on the input designation information or the setting information stored in the storage means, the selection means selects the recording method to be reproduced according to the designation by the user or the capability of the reproduction apparatus. Next, the sound information of the recording method selected by the selection means from among the plurality of sound information having the same contents with different recording methods is reproduced by the reproduction means based on the control information. That is, the first section information as the control information recorded in the control information recording area is read, and the first section unit to which the desired sound information belongs is searched. Next, the management information corresponding to the first division information indicating the searched first division unit is read, and the second division information related to the first division information is read. With this second segment information, the second segment unit is further searched for the sound information of the first segment unit previously searched, and the sound information is reproduced for each reproduction unit. When the user directly designates the second division unit, the second division unit designated by the same procedure is searched, and only the sound information of the designated second division unit is obtained. Will be played. Therefore, the sound information of a predetermined recording method is reproduced only by the user specifying according to the content of the desired sound information. As described above, according to the present invention, sound information of the same content recorded in an information recording medium and having different recording methods can be appropriately reproduced without causing confusion to the user.
[0028]
In order to solve the above-described problem, the playback device according to claim 10 is the playback device according to claim 9, wherein the management information includes information indicating the recording method, and the control information includes the information. It further comprises an extracting means for extracting information indicating the recording method of each sound information recorded on the recording medium, and a recording method information displaying means for displaying the extracted information.
[0029]
According to the playback device of the tenth aspect, information indicating the recording method of each piece of sound information recorded on the information recording medium is extracted from the control information by the extracting unit. The extracted information is displayed by the recording method information display means. Accordingly, the user can designate the recording method to be reproduced with reference to the displayed recording method information, and can perform appropriate reproduction according to the user's request.
[0030]
In order to solve the above-described problem, the playback device according to claim 11 is the playback device according to claim 9 or 10, wherein the input unit is configured to store the designation information regardless of an operation state of the playback device. When the selection means or the reproduction means is changed in the content of the designation information input by the input means, each of the selection means or the reproduction means is set based on the changed designation information. It is set to perform processing.
[0031]
According to the playback device of the eleventh aspect, whether the playback device is in a playback operation or is stopped, the input of the sound information designation information by the user is accepted by the input means. When there is a change in the content of the designation information input in this way, the selection unit or the reproduction unit performs respective processing based on the changed designation information. Accordingly, the user's request such as a change of the recording method can be reflected in the reproduction of the sound information in real time, so that more appropriate reproduction according to the user's request is possible.
[0032]
The playback device according to claim 12 rewrites the contents of the setting information stored in the storage means in the playback device according to any one of claims 9 to 11, in order to solve the problem. A rewriting unit is further provided.
[0033]
According to the playback device of the twelfth aspect, when the user instructs rewriting of the setting information by the rewriting means, the content of the setting information stored in the storage means is rewritten by the rewriting means. Therefore, since a recording method suitable for the usage mode of the playback apparatus can be stored in advance according to the user's request, an appropriate usage environment can be provided.
[0034]
In order to solve the above-mentioned problem, the playback device according to claim 13 is the playback device according to any one of claims 9 to 12, wherein the selection means is based on the designation information or the setting information. When the recording method selected by the above-mentioned recording method cannot be processed by the playback apparatus, the recording apparatus further comprises warning display means for displaying a warning.
[0035]
According to the playback device of claim 13, when the recording method selected by the selection unit based on the designation information or the setting information cannot be processed by the playback device, the warning display unit displays a warning. Is done. Therefore, the user can specify or rewrite an appropriate recording method according to the capability of the playback apparatus.
[0036]
In order to solve the above-described problem, the playback device according to claim 14 is the playback device according to any one of claims 9 to 13, wherein the selection unit stores the memory in an initial setting state. The recording method is selected based on the initial setting information stored in the means.
[0037]
According to the reproducing apparatus of the fourteenth aspect, in the initial setting state, the recording unit is selected by the selection unit based on the initial setting information stored in advance in the storage unit. Therefore, it is possible to perform appropriate reproduction by a recording method suitable for the reproduction apparatus without bothering the user.
[0038]
In order to solve the above-mentioned problem, the reproducing device according to claim 15 is the reproducing device according to claim 14, wherein rewriting means for rewriting the contents of the setting information stored in the storage means; When the recording method selected by the selection unit based on setting information cannot be processed by the playback device, the recording unit further includes a warning display unit that displays a warning, and the selection unit further includes the warning display unit. As long as the warning display is not performed, the recording method is based on each information in the priority order of designation information input by the input means, then setting information rewritten by the rewriting means, and finally the initial setting information. It is set to perform selection of this.
[0039]
According to the reproducing apparatus of the fifteenth aspect, the recording method is selected by the selection unit based on either information specified in real time by the user, setting information rewritten by the user in advance, or initial setting information. However, this selection process has a priority. This priority order is the order of playback device confidence, real-time user designation, setting information rewriting by the user, and initial setting. Accordingly, since the ability of the playback device is given the highest priority, a recording method that does not match the playback device is not selected. In addition, when designation or rewriting by the user is not performed, an appropriate recording method is selected based on the initial setting information. However, this information can be appropriately rewritten according to the user's request, and even when such rewriting is performed, it can be specified in real time. Appropriate reproduction reflecting the request of the limited user can be performed.
[0040]
In order to solve the above-mentioned problem, the reproducing apparatus according to claim 16 is the reproducing apparatus according to any one of claims 9 to 15, wherein the recording method is normal recording and binaural recording, The playback device further includes detection means for detecting an insertion state of a headphone plug with respect to a headphone jack, and the playback means performs binaural recording when the detection means detects that the headphone plug is inserted into the headphone jack. The sound information is set to be reproduced.
[0041]
According to the playback device of the sixteenth aspect, when the user inserts the headphone plug into the headphone jack, this insertion is detected by the detecting means, and the sound information recorded in binaural recording is searched. Therefore, when sound information recorded in binaural recording is recorded on the information recording medium to be played back, binaural recording suitable for headphone playback can be performed without performing an operation for specifying the sound information recorded in binaural sound. The recorded sound information is played back. Therefore, it is possible to perform appropriate reproduction according to the use situation while eliminating the need for complicated operations by the user.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0043]
(1) DVD video format
First, the recording format (physical recording format) of video information and audio information (including music information; the same applies hereinafter) on a video DVD will be described with reference to FIG.
[0044]
(1.1) Physical format
As shown in FIG. 1, the video DVD 1 has a lead-in area LI at its innermost periphery and a lead-out area LO at its outermost periphery, and is a video zone between which video information and audio are recorded. Information is divided and recorded in a plurality of VTS (Video Title Set) 4 (VTS # 1 to VTS # n) each having an ID (identification) number. Here, the VTS is a related title (the number of audio information and sub-picture information included therein, the attributes such as the specification, the corresponding language, etc. are the same) titles (movies etc.) that the producer intends to present to the viewer. It is a set (group) of all the works. A UDF (Universal Disk Format) 2 having information for managing the format of a file recorded in the disk is recorded immediately outside the lead-in area LI, and subsequently a VMG (Video Manager) 3 is recorded. Information recorded as the VMG 3 includes, for example, video information recorded on the video DVD 1 such as a menu showing selection items for the user, information for preventing illegal copying, or an access table for accessing each title. And management information related to the entire audio information.
[0045]
One VTS 4 is divided and recorded into a plurality of VOBs (Video OBjects) 10 each having an ID number starting from a VTSI (Video Title Set Information) 11. Here, a portion constituted by a plurality of VOBs 10 is referred to as a VOB set (VOBS).
[0046]
In the VTSI 11 recorded at the head of the VTS 4, information such as PGCI (Program Chain Information) which is various information related to the program chain, which is a logical division combining a plurality of cells (cells will be described later), is recorded. The In addition, each VOB 10 is recorded with substantial parts of video information and audio information.
[0047]
One VOB 10 is composed of a plurality of cells 20 each having an ID number. One cell 20 includes a plurality of VOB units (VOBU) 30 each having an ID number. Here, the VOBU 30 is one unit constituted by any one of video information, audio information, sub-video information (referring to sub-video information such as subtitles in a movie) or only a navigation pack described later.
[0048]
One VOBU 30 includes a navigation pack 41 in which control information for controlling video information included in the VOBU 30 is stored, a video pack 42 including video data as video information, and audio data as audio information. An audio pack 43 and a sub-picture pack 44 including sub-picture data as sub-picture information are configured. Here, only video data is recorded as video data, and only audio data is recorded as audio data. In addition, as sub-picture data, only graphic data such as characters and figures as sub-pictures is recorded.
[0049]
In the pack header recorded at the head of each pack P, the data included in each pack P is read from a track buffer in a playback apparatus to be described later and input to each buffer is started on the playback time axis. Read start time information called SCR (System Clock Reference) indicating the read start time, a start code indicating the start of the pack P, and the like are recorded.
[0050]
The navigation pack 41 is search information (specifically, an address or the like on the DVD 1 in which the video or audio to be reproduced / displayed is recorded) for searching for the video or audio or the like to be reproduced / displayed. Data Search Information) data 51 and PCI (Presentation Control Information) data 50, which is information related to playback display control when video or audio searched based on the DSI data 51 is played back and displayed.
[0051]
All the video packs 42 included in one VOBU 30 are configured by one or a plurality of GOPs (Group Of Pictures). The GOP is the smallest that can be reproduced independently, as defined in the MPEG2 (Moving Picture Experts Group 2) standard, which is an image compression method employed when recording video information on the DVD 1 in the present embodiment. It is an image unit.
[0052]
In the hierarchical recording format shown in FIG. 1 described above, each category is freely set by the producer of recording information to be recorded in the DVD 1 (hereinafter simply referred to as the producer) according to the intention. To be recorded. By performing reproduction based on the logical structure described later for each of these sections, various reproductions with various changes are possible.
[0053]
(1.2) Logical format
Next, a logical format (logical structure) in which information recorded by the physical division shown in FIG. 1 is combined will be described with reference to FIG. Note that the logical structure shown in FIG. 2 does not actually record information on the DVD 1 in that structure, but reproduces the data shown in FIG. 1 (especially cell 20) in combination with the logical structure shown in FIG. Playback control information (access information or time information) for recording is recorded on the DVD 1, particularly in the VTSI 11.
[0054]
For convenience of explanation, starting from the lower hierarchy in FIG. 2, one program 60 is logically configured by selecting and combining a plurality of cells 20 in the physical structure described in FIG. . The producer can also define the program 60 as a minimum unit in which one or a plurality of programs 60 can be freely selected and viewed, and this unit is referred to as a PTT (Part of Title).
[0055]
Here, the number of one cell 20 is handled as a cell ID number when the cell 20 is handled in the physical format shown in FIG. 1 (shown as cell ID # in FIG. 1), and is shown in FIG. When handled in the logical format, they are handled as cell numbers in the order of description in PGCI described later.
[0056]
A single PGC (Program Chain) 61 is logically configured by combining a plurality of programs 60. The above-described PGCI is defined in units of the PGC 61, and in the PGCI, the reproduction order of the cells 20 for each program 60 when the respective programs 60 are reproduced (the program unique to each program 60 by this reproduction order). A number is assigned.), An address which is a recording position on the DVD 1 of each cell 20, a number of the first cell 20 to be reproduced in one program 60, and the like.
[0057]
In one PGC 61, in addition to the PGCI, data such as substantial video and audio is included as a combination of programs 60 (in other words, as a combination of cells 20).
[0058]
One title 62 is logically configured by one or a plurality of PGCs 61. The title 62 is, for example, a unit corresponding to one movie in terms of video information, and is complete information provided to the viewer of the DVD 1 by the producer.
[0059]
One or more titles 62 logically constitute one VTS 63.
[0060]
The information corresponding to one VTS 63 shown in FIG. 2 corresponds to the information included in one VTS 4 shown in FIG. That is, all information logically included in the VTS 63 shown in FIG. 2 is recorded on the DVD 1 as a single VTS 4.
[0061]
Based on the logical format described above, the producer specifies the information divided in the physical structure, so that the video or music that the viewer should watch is formed.
[0062]
(2) DVD audio format
Next, a recording format (physical recording format) of audio information (including music and audio information; the same applies hereinafter) on an audio DVD will be described with reference to FIG.
[0063]
(2.1) Physical format
First, the physical format (physical recording format) on the audio DVD will be described with reference to FIG.
[0064]
First, as shown in FIG. 3, the audio DVD 200 according to the embodiment has a lead-in area LI at the innermost peripheral portion and a lead-out area LO at the outermost peripheral portion. It has become. In this, an audio zone is always recorded. In this audio zone, audio information is divided and recorded in a plurality of ATS (Audio Title Set) 203 (ATS # 1 to ATS # n) each having an ID (identification) number. At the head of the audio zone, a SAPPT (Simple Audio Play Pointer Table) 204 is recorded as playback control information for simple playback (such as 2-channel playback). This SAPPT is recorded on all DVD disks having an audio zone. The SAPPT 204 may be recorded in the lead-in area LI or the AMG 202 described later.
[0065]
A UDF (Universal Disk Format) 201 having information for managing the format of a file recorded in the disc is recorded immediately outside the lead-in area LI, a SAPPT 204 is recorded following the UDF 201, and then AMG. (Audio Manager) 202 is recorded. However, the UDF 201, SAPPT 204, and other files are not necessarily arranged in this order.
[0066]
The information recorded in the SAPPT 204 is information necessary for reproducing LPCM data with 2ch. Information recorded as the AMG 202 is recorded on the audio DVD 200 such as a menu for prompting the user to select an item, information for preventing illegal copying, or an access table for accessing each title. This is management information related to the entire audio information.
[0067]
One ATS 203 is composed of a plurality of AOBs (Audio Objects) 210 each having an ID number with an ATSI (Audio Title Set Information) 211 as the head.
[0068]
Here, a part constituted by a plurality of AOBs 210 is referred to as an AOB set (AOBS). This AOB set is a substantial part of audio information.
[0069]
The ATSI 211 recorded at the head of the ATS 203 includes APGCI (Audio Program Chain Information) as reproduction control information, which is various information relating to a program chain, which is a logical division combining a plurality of cells (cells will be described later). Etc. are recorded. Each AOB 210 records the actual part of the audio information. One AOB 210 includes a plurality of cells 220 each having an ID number.
[0070]
One cell 220 is composed of a plurality of packed audio packs 230 or an audio pack and a real time information pack 231. The audio pack 230 is a pack of audio information to be recorded on an audio DVD for each predetermined size, and includes audio information digitized by, for example, linear PCM. The real-time information pack 231 includes text information, BPM (Beat Per Minutes), beat information, and the like.
[0071]
In the recording format having the hierarchical structure shown in FIG. 3 described above, each category is freely set by a producer of recording information to be recorded in the audio DVD 200 (hereinafter simply referred to as a producer) according to the intention. Can be recorded. By performing reproduction based on the logical structure described later for each of these sections, various reproductions with various changes are possible.
[0072]
(2.2) Logical format
Next, a logical format (logical structure) in which information recorded by the physical division shown in FIG. 3 is combined will be described with reference to FIG.
[0073]
Note that the logical structure shown in FIG. 4 does not actually record information on the audio DVD 200 in that structure. Audio information is recorded in the physical format shown in FIG. 3 on the audio DVD, and information for reproducing the audio information is recorded in the above-described SAPPT 204, AMG 202, and ATSI 211 in the logical format shown in FIG. It is.
[0074]
For convenience of explanation, starting from the lower hierarchy in FIG. 4, the index 259 is configured by selecting and combining one cell or a plurality of cells 220 in the physical structure described in FIG. The index can also be used as a song number and is the smallest unit accessible by the user.
[0075]
One track 260 is logically constituted by one or a plurality of indexes 259. The track 260 is an information unit corresponding to one song. The user can select an arbitrary track (song) and directly access it.
[0076]
Here, the number of one cell 220 is handled as a cell ID number (indicated as cell ID # in FIG. 3) when the cell 220 is handled in the physical format shown in FIG. 3, and the logic shown in FIG. When handled in the format, the cell numbers are handled in the order of description in APGCI described later.
[0077]
A track 260 (song) is an information unit including a plurality of cells, and is a set of cells having certain common attributes. That is, the attributes of all the cells in the track are all the same. All cells included in a track are recorded adjacent to each other in the same object.
[0078]
One title 261 is logically configured by combining one or a plurality of tracks 260. However, the title itself is not recognized by the user as an access unit. Therefore, it is impossible to specify a title number and access an arbitrary title.
[0079]
In the audio DVD, the attributes of each track 260 constituting the title 261 can be defined independently in a maximum of 8 patterns. That is, for each track (song), attributes as audio information such as the number of channels, a quantization method, and a sampling frequency may be changed.
[0080]
The APGCI described above is defined in units of the title 261. The APGCI includes the attribute of each track, the reproduction order of the cells 220 for each track 260 when reproducing each track 260, and the audio of each cell 220. The address which is the recording position on the DVD 200, the number of the first cell 220 to be reproduced in one track 260, the reproduction method of each track 260 and various commands are included.
[0081]
In one title 261, in addition to the APGCI, substantial audio information is included as a combination of tracks (songs) 260 (in other words, as a combination of cells 220).
[0082]
One title group 262 is logically configured by one or a plurality of titles 261. Also, the title group 262 is the maximum unit that can be accessed by the user, and a maximum of nine title groups can be defined in one volume. The title group 262 includes one or a plurality of titles 261 that are collected based on a certain relationship, and all the titles in the title group are continuously played back. For example, a collection of songs by a singer or composer can be assembled as one title group.
[0083]
One or more title groups 262 logically constitute one volume 263. The volume 263 is an information unit corresponding to one album (DVD).
[0084]
Actual audio information included in one title shown in FIG. 4 is recorded in any one ATS 203 shown in FIG. 3 on the audio DVD.
[0085]
Based on the logical format described above, the music specified by the producer is specified by the producer, thereby forming music that the viewer listens to.
[0086]
(3) Types of DVD
Next, the type of disc in the DVD will be described. In the following description, regarding information recorded on a DVD, information including both video and audio, such as a movie, may be referred to as “AV information”, and information of only the video portion is referred to as “video ( (Or video) information ”. Also, only audio part of AV information such as movies and only audio information such as music is called “audio (or voice) information”.
[0087]
Further, as a DVD player for reproducing these various DVD discs, a video DVD player capable of reproducing AV information in the DVD video format (hereinafter referred to as “video player”), and various audio information in the DVD audio format are used. An audio DVD player (hereinafter referred to as “audio player”) that is played in a playback mode, a simple audio DVD player (hereinafter referred to as “simple audio player”) that reproduces LPCM audio information in the DVD audio format in 2ch, and There are four types of compatible DVD players (hereinafter referred to as “compatible players”) capable of reproducing both AV information in the DVD video format and audio information in the DVD audio format. Each DVD player will be described in detail later.
[0088]
There are four types of DVDs for recording AV information or audio information: video DVDs, video DVDs with audio navigation, audio-only DVDs, and audio / video DVDs. FIG. 5 schematically shows physical formats of four types of DVDs.
[0089]
These DVDs all have the same disk shape and information recording method (modulation method, track pitch, pit size, etc.), and only the information content (content) is different.
[0090]
(3.1) Video DVD
In FIG. 5, a video DVD is shown at the top. On this disc, video information such as a movie according to the DVD video format and audio information (that is, AV information) reproduced at the same time are recorded. Accordingly, only the video zone exists in the recording area between the lead-in area LI and the lead-out area LO, and playback control information, video information, and audio information are recorded in a plurality of VTSs, and management of these VTSs is performed. A VMG including information is recorded. As described with reference to FIG. 1, video information is recorded as a video pack, and audio information is recorded as an audio pack.
[0091]
This video DVD is reproduced by a video player and a compatible player based on navigation information (information defining control information for reproduction, which will be described in detail later) included in the management information recorded in the VMG. The However, since navigation information in the DVD audio format is not recorded, it cannot be reproduced by an audio player.
[0092]
(3.2) Video DVD with audio navigation
The second level shows a type of video disc called a video DVD with audio navigation. This video DVD with audio navigation is capable of reproducing video information (including accompanying audio information) such as movies in the DVD video format with a video player, and also recording navigation information in the DVD audio format. This is a disc that allows a player to reproduce only audio information of AV information of VOB in VTS. A portion of AV information in which only audio information can be reproduced by an audio player is called an audio play part.
[0093]
The recording format of the video DVD with audio navigation is based on the DVD video format shown in FIG. 1, and AV information is recorded in the video zone in the form of a plurality of VTSs. In addition to this, the video DVD with audio navigation is recorded as an ATS in the front of the video zone as an audio zone, which includes ATSI including playback control information necessary for playing back only the audio information in the VTS in accordance with the DVD audio format. AMG as ATS management information is recorded. AOB, which is a substantial part of audio information, is not recorded in ATS. That is, in this AMG and ATSI, the audio information (specifically, the audio play part audio pack (see FIG. 1) in each VOB) included in each VTS in the video DVD with audio navigation is reproduced by the audio player. Navigation information is described.
[0094]
In addition, SAPPT is recorded at the head of the audio zone. This SAPPT describes navigation information for reproducing LPCM audio information included in the VTS in 2ch.
[0095]
This video DVD with audio navigation is reproduced by a video player and a compatible player based on the navigation information recorded in the VMG. Also, the audio information of the audio play part is reproduced by the audio player based on the navigation information recorded in the AMG in various reproduction forms according to the player's ability. Also, LPCM information of the audio play part is reproduced in 2ch by a simple audio player based on the navigation information recorded in SAPPT.
[0096]
(3.3) Audio-only DVD
The third level shows an audio-only DVD. Only audio information is recorded on this disc except for some still images and text information. Accordingly, only the audio zone exists in the recording area between the lead-in area LI and the lead-out area LO, ATSI and AOB are recorded as a plurality of ATSs, and AMGs including management information of these ATSs are recorded. Yes. Further, SAPPT is recorded in the lead-in area LI or the audio zone.
[0097]
Each ATS includes one or a plurality of AOBs that are the substantial part of the audio information. This audio-only DVD is played back in various playback modes according to the player's ability by the audio player and the compatible player based on the navigation information recorded in the AMG. Also, LPCM information in the audio zone is reproduced in 2ch by a simple audio player based on the navigation information recorded in SAPPT. However, since navigation information in the DVD video format is not recorded, it cannot be reproduced by a video player.
[0098]
(3.4) DVD for audio and video
What is shown at the bottom of FIG. 5 is an audio / video DVD. There are an audio zone and a video zone between the lead-in area LI and the lead-out LO. In the video zone, VTS including VMG, playback control information, and actual AV information (VOB) is recorded in accordance with the DVD video format in the same manner as the video DVD. SAPPT is recorded in the lead-in area LI or the audio zone.
[0099]
Similar to the audio-only DVD, in the audio zone, a plurality of ATSs (ATS # 1, # 2 in the figure) including SAPPT, AMG, reproduction control information, and actual audio information are recorded in accordance with the DVD audio format. The Furthermore, ATS (ATS # 3 in the figure) including only reproduction control information for reproducing only the audio information of the VOB in the VTS of the video zone is also recorded. That is, in the audio / video DVD, the AV information in the DVD video format and the audio information in the DVD audio format are recorded in different areas.
[0100]
In the case of an audio / video DVD, AMG not only includes management information for all ATSs in the audio zone, but also includes management information for all ATSs and VTSs in the audio and video zones. . The SAPPT also includes management information including all ATSs and VTSs in the audio zone and the video zone. However, the management information is only related to LPCM data that can be reproduced by 2ch in both zones.
[0101]
Here, the audio / video dual-use DVD is different from a video disc with audio navigation and an audio-only DVD in that the recording area of the disc is divided into an audio zone and a video zone, respectively, depending on the AV information by the DVD video format and the DVD audio format. The audio information is recorded, and the AMG and SAPPT recorded in the audio zone include management information including all ATSs and VTSs in the disc.
[0102]
More specifically, in a video disc with audio navigation, audio information is recorded in a VOB multiplexed with video information in pack units based on the DVD video format. APGCI, which is reproduction control information for reproducing audio information recorded in the VOB, is configured as ATSI, and only these ATSs are managed by AMG. No title management information in the video zone is recorded in the AMG. Similarly, navigation information related to the audio play part in the video zone is also described in SAPPT.
[0103]
In contrast, an audio / video DVD has separate areas for recording audio information in the DVD audio format and AV information in the DVD video format. In the audio zone, the actual part of the audio information is recorded in each ATS as a plurality of AOBs by the DVD audio format shown in FIG. Furthermore, not only the ATS in which APGCI, which is playback control information of audio information in each ATS, is recorded in ATSI, but also the playback control information of audio information recorded in VOB in VTS in the video zone is recorded in ATSI as APGCI. Two types of ATSs are recorded (the audio substance information is in the video area and only the ATSI as navigation information exists as the ATS). That is, all the reproduction control information related to the reproduction of the audio information is managed by the AMG regardless of the zone. Furthermore, information related to tracks that can be reproduced in 2ch is recorded in SAPPT among the reproduction control information related to reproduction of LPCM audio information recorded in all ATSs and VTSs.
[0104]
On the other hand, in the video zone, AV information is recorded as a plurality of VTSs, and reproduction control information of AV information in each VTS is recorded as PGCI in VTSI, and all these VTSs are managed by VMG. On the other hand, AMG also manages all playback control information related to playback of AV information in the video zone.
[0105]
Specifically, in the case of an audio-only DVD and an audio / video DVD, AMG is general management information, and in the case of a video DVD, VMG is main management information. In the case of a video DVD with audio navigation, the AMG manages only the reproduction of audio information in the VOB by the audio player, and does not manage the video title.
[0106]
In the case of an audio-only DVD or an audio / video DVD, SAPPT is general management information for reproducing LPCM audio information in 2ch by, for example, a simple or portable audio player. In the case of a video DVD, since there is no SAPPT, even if it is recorded in LPCM, only audio information is not reproduced by a simple player. In the case of a video DVD with audio navigation, SAPPT manages only the reproduction of LPCM audio information (audio only title) of the audio play part in the VOB by the simple audio player, and does not manage the video title.
[0107]
By adopting such a structure, optimum reproduction can be performed according to the capability of the reproducing apparatus, and compatibility compatible between each disk and each reproducing apparatus is realized.
[0108]
(4) Title playback control
Next, the title reproduction control will be described in more detail. Here, the title is a series of works (presentations) or works having a common reproduction form composed of entity information such as AV information and audio information recorded on the DVD and reproduction control information indicating the reproduction procedure. Refers to a part of As described in the physical and logical formats of the audio DVD, the user does not instruct the player to directly select a title and start playback. The user selects a title group composed of one or a plurality of titles and starts reproduction. However, the player determines what kind of title the instructed title group is configured from the navigation information in the AMG and ATSI, and plays the title group by continuously playing each title. ing. Therefore, the reproduction of a title is fundamental in a DVD player. Therefore, the title in the DVD audio format and the playback control of the title will be described using an audio / video dual-use disc as an example.
[0109]
(4.1) Title types
First, a title in the DVD audio format (title 261 in FIG. 4) is an audio title (hereinafter also referred to as “AOTT (Audio Only TiTle)”) formed by reproducing audio information in the audio area, and an AV in the video area. It is classified into video titles configured by reproducing information. There are two types of video titles: video titles (hereinafter also referred to as “AVTT (Audio Video TiTle)”) and video and audio titles (hereinafter also referred to as “AVTT / AOTT (Audio Video TiTle / Audio Only TiTle)”). being classified. In the case of the DVD video format, only an image title is available.
[0110]
AOTT is a title in which only audio information is reproduced, and its entity information is composed of audio information recorded in the AOB in the audio zone.
[0111]
AVTT is a title in which audio information is always reproduced with video information, and its entity information is composed of AV information recorded in a VOB in the video zone. In AVTT, reproduction of only audio information is not permitted, and reproduction with video information is essential.
[0112]
AVTT / AOTT is a title that can be played back only with audio information, and can also play back audio information along with video information as AV information (that is, it can be called a dual-purpose title). Is composed of AV information recorded in the VOB in the video zone.
[0113]
Whether the AVTT / AOTT is reproduced as AV information or audio information depends on the capability of the reproducing apparatus. That is, a playback device (audio player) that does not have AV information playback capability plays back AVTT / AOTT using only audio information, and a playback device (video player and compatible player) that has AV information playback capability plays back AVTT / AOTT. Play with audio information along with the information.
[0114]
By the way, the navigation information for the audio player and the navigation information for the compatible player are separately recorded in the AMG. The navigation information for the audio player is navigation for reproducing only the audio information of the audio title (AOTT) composed of the audio information in the AOB of the audio zone and the dual-purpose title composed of the AV information in the VOB of the video zone. This is an audio-only title search pointer describing information, and is recorded in the audio-only title search pointer table (AOTT_SR). On the other hand, an audio title search pointer that is navigation information for a compatible player capable of reproducing all types of titles is recorded in the audio title search pointer table (ATT_SR). Such navigation information will be further described in detail with reference to FIG.
[0115]
When the audio / video DVD is reproduced by a video player, the AV information in each VTS is reproduced in accordance with the navigation information for the video player recorded in the VMG and VTSI in the video zone.
[0116]
When the audio / video DVD is reproduced by an audio player, the audio information is reproduced in accordance with the reproduction control information for the audio player recorded in the ATSI with reference to AOTT_SR in the AMG in the audio zone. There are two cases in which audio information is reproduced by an audio player. One is the case where the audio information in the AOB is reproduced according to ATSI and APGCI which are the navigation information in the AMG and ATS of the audio zone, and the other is the AMG and ATSI, similar to the video disc with audio navigation, This is a case where audio information recorded in the VTS in the video zone is reproduced according to APGCI. In the latter case, for the same object, the video player reproduces AV information with an image, and the audio player reproduces only the audio information.
[0117]
Furthermore, when this audio / video DVD is played back by a compatible player, ATT_SR, which is navigation information for the compatible player in the AMG in the audio zone, is referred to according to the playback control information recorded in the ATSI and VTSI. The audio information in the audio zone and the AV information in the video zone are reproduced in an integrated manner.
[0118]
All titles in the audio / video DVD are managed by the AMG, and are classified into one of the above three types of titles in the DVD audio format. Consider a case where an audio / video DVD having the logical format example shown in FIG. 6 is played back using a compatible player having both DVD audio format and DVD video format playback capabilities. In this audio / video DVD, the volume is composed of seven title groups # 1 to # 7, and each title group is composed of one title. One title includes one or a plurality of tracks. In FIG. 6, the left column shows navigation information for compatible players (ATT_SR), the center column shows navigation information for video players (TT_SR), and the right column shows navigation information for audio players (AOTT_SR). Is.
[0119]
Since titles # 2 and # 5 are AOTTs, only the audio information recorded in the AOB in the audio zone of the audio / video DVD is reproduced when these titles are reproduced.
[0120]
Since titles # 4, # 6, and # 7 are AVTT, AV information recorded in the VOB in the video zone of the audio / video DVD is reproduced. Therefore, video and audio are always reproduced.
[0121]
Since titles # 1 and # 3 are AVTT / AOTT, the compatible player reproduces both audio and video based on video and audio information recorded in the VOB in the video zone of both audio and video DVDs. . When an audio player that does not have the ability to reproduce video information is used, only the audio information recorded in the VOB in the video zone of the audio / video DVD is reproduced in titles # 1 and # 3 (FIG. (See right column of 6). That is, the AVTT / AOTT title is created so as to reproduce the recorded information by a method capable of maximizing the capability according to the capability of the reproducing device that is intended to reproduce the DVD disc.
[0122]
In order to eliminate the confusion at the time of title group reproduction, it is promised that AVTT cannot form a title group with other types of titles (AOTT, AVTT / AOTT).
[0123]
(4.2) Double management of VOB
Next, the concept of PGCI and APGCI defined for VOB in the video zone of the audio / video DVD will be described. In the VOB, video information and audio information are recorded in a multiplexed form. When VOB is reproduced as AV information, it is reproduced according to PGCI, which is the same concept as in the case of a video DVD. As described above, since the method of recording and reproducing AV information in the audio DVD is matched to the video format, compatibility with the video player is maintained. On the other hand, when only the audio information in the VOB is reproduced, the reproduction is performed according to APGCI. This APGCI is defined independently of PGCI. This will be described with reference to FIG.
[0124]
FIG. 7 shows the concept of a program when a certain VOB is played back as AV information in accordance with PGCI and when it is played back only as audio information in accordance with APGCI. In FIG. 7, VOB includes video data, sub-picture data, and audio data. When this VOB is reproduced as AV information, the reproduction control is performed based on PGCI. In PGCI, the VOB is divided into six video cells # 1 to # 6. The video program # 1 is divided by the video cell # 1, the video program # 2 is divided by the video cell # 2- # 4, and the video cell # 6 is divided. Video program # 3 is configured. When AV information is played back by a video player or a compatible player such as AVTT / AOTT, playback is performed according to such PGCI.
[0125]
On the other hand, when the audio player reproduces only the audio information from the same VOB, the reproduction is performed according to APGCI. Each audio program defined by APGCI is composed of one or more audio cells. Here, even for the same object (VOB), the audio cell can be defined (independently) different from the video cell (and of course, can be defined to match). That is, the start position and end position of each audio cell can be set independently of any video cell. Also, the playback order of audio cells defined by APGCI can be defined independently of the playback order of video cells defined by PGCI.
[0126]
In the example of FIG. 7, the audio program # 1 is composed of audio cells # 1 and # 2, and the audio program # 2 is composed of audio cell # 3. APGCI includes information such as the recording position and playback order of audio cells included in these audio programs, and audio information is played back based on the information.
[0127]
As described above, the reason why the audio cell can be defined independently of the video cell is to manage the audio information independently of the AV information. In this way, time management or the like can be performed independently of AV information when only audio information in the VOB is reproduced. In addition, among the audio information included in the AV information, only a meaningful part can be reproduced even if the audio information is reproduced alone. Of course, it may be defined as the same cell.
[0128]
(4.3) Title search pointer
Next, playback of the above-described titles using a title search pointer in an audio / video DVD will be described with reference to FIGS.
[0129]
FIG. 8 shows an example of navigation information for an audio / video DVD. As described above, an audio / video DVD has a video zone according to the DVD video format and an audio zone according to the DVD audio format. Information reproducible from an audio / video DVD is AV information (video information with sound) such as a movie and audio information. Then, navigation information for preventing confusion and contradiction when each information is reproduced by various players is recorded on the audio / video DVD separately for each player.
[0130]
(4.3.1) AMG, ATSI, title search pointer table
In FIG. 8, an audio / video DVD has an audio zone and a video zone. The audio zone is composed of AMG 202, ATS # 1, ATS # 2, and ATS # 3, ATS # 1 is composed of ATSI211 and AOB210, and ATS # 3 is composed only of ATSI212. The video zone is composed of VMG3, VTS # 1, and VTS # 2, and VTS # 1 is composed of VTSI11 and VOB10.
[0131]
The AMG 202 includes an AMGI (AMG Information) 240 that is an actual part of navigation information. The AMGI 240 includes an AMGI management table 241 including information such as a file size and a recording address of the AMGI 240, an ATT search pointer table 242 and an AOTT search pointer table 243. Here, ATT is a generic term for an audio-only title (AOTT) composed only of audio information, an image-only title (AVTT) composed of AV information, and an audio / video mixed title (AVTT / AOTT) composed of AV information. It is.
[0132]
Here, the search pointer is a pointer indicating the recording position on the DVD of the reproduction control information (in this case, APGCI and PGCI) of each title. As described above, each title is composed of entity information such as audio information and AV information, and reproduction control information for reproducing the entity information in combination. This reproduction control information is recorded in ATSI in ATS or VTSI in VTS. The search pointer is a pointer indicating the recording position in the ATSI or VTSI of the reproduction control information for each title. The navigation information is information for managing the reproduction of each title, and is a concept including the search pointer in the present embodiment.
[0133]
The ATT search pointer table 242 is a table describing navigation information when each title of the audio / video DVD is reproduced by a compatible player. On the other hand, the AOTT search pointer table 243 is a table describing navigation information when each title of the audio / video DVD is reproduced by an audio player. Further, the ATT search pointer table 242 and the AOTT search pointer table 243 have a 1: 1 correspondence, and the number of search pointers described in the ATT search pointer table is the number of all titles included in the audio / video DVD. Matches the number. For example, as shown in FIG. 6, if a total of seven titles are included in the audio / video DVD, search pointers corresponding to the seven titles are described in the ATT search pointer table 242. Regardless of the type of title, the AOTT search pointer table 243 also has a frame for describing seven search pointers. The frame of each table corresponds to 1: 1.
[0134]
(4.3.1.1) ATT_SRP
The audio title search pointer (ATT_SRP) is navigation information used when an audio / video DVD is reproduced by a compatible player. Therefore, when an audio / video DVD is set, the compatible player refers to this ATT_SRP and plays back each title.
[0135]
The example of the navigation information shown in FIG. 8 corresponds to the example of the audio / video DVD shown in FIG. 6, where titles # 1 and # 3 are video / audio titles (AVTT / AOTT), titles # 2 and # 3. 5 is an audio-only title (AOTT), and titles # 4, # 6, and # 7 are image-only titles (AVTT).
[0136]
As already described, three types of titles (AOTT, AVTT / AOTT, AVTT) can be recorded on an audio / video DVD. Therefore, in the audio / video DVD, search pointers for all three types of titles (AOTT, AVTT / AOTT, AVTT) are described in the AMG ATT search pointer table 242.
[0137]
However, the title search pointer 245 actually written in the ATT search pointer table 242 of FIG. 8 is only the audio only title search pointer (AOTT_SRP) or the image dedicated title search pointer (AVTT_SRP), and the video / audio title (AVTT / AOTT). ) Is described as an image dedicated title search pointer (AVTT_SRP) (the actual description is shown in parentheses in the table of FIG. 8). This is because it is not necessary for a compatible player to distinguish between an audio / video title (AVTT / AOTT) and an image-only title (AVTT). In other words, the compatible player has the playback capability of the DVD video format, and all video and audio titles are played back as AV information, so there is no need to distinguish it from the video search pointer (AVTT_SRP) in the navigation information. is there. Therefore, all titles that accompany image reproduction are described in a common format as an image dedicated title search pointer (AVTT_SRP).
[0138]
Therefore, as can be seen by comparing the left column of FIG. 6 with the audio title search pointer table 245 of FIG. 8, the ATT search pointer table 242 describing the navigation information for the compatible player has the image-specific title (title # 4, 6). 7) and an audio / video title (title # 1, 3) describe an image-only title search pointer (AVTT_SRP), and an audio-only title (title # 2, 5) describe an AOTT search pointer (AOTT_SRP). The The compatible player refers to this table 242, and reproduces titles # 1, 3, 4, 6, and 7 as AV information and titles # 2 and # 5 as audio information, as shown in the left column of FIG. To do.
[0139]
(4.3.1.2) AOTT_SRP
On the other hand, navigation information for an audio player is described in the AOTT search pointer table 243. Therefore, when an audio / video DVD is set, the audio player performs reproduction with reference to the AOTT search pointer table 243.
[0140]
In this table, search pointers related to the audio title (AOTT) and the video / audio title (AVTT / AOTT) are described. Since the audio player does not have the ability to reproduce AV information, there is no need to describe a search pointer for an image-only title (AVTT). However, the only search pointer actually written in this table is the AOTT search pointer (AOTT_SRP). For the audio player, it is only necessary to have information about whether or not the title can reproduce only audio, and it is not necessary to distinguish between the audio title (AOTT) and the video / audio mixed title (AVTT / AOTT). Therefore, on the audio only title search pointer table (AOTT_SRPT) 243, the audio title (AOTT) and the audio / video title (AVTT / AOTT) are not distinguished, and all are described in the common format as the AOTT search pointer (AOTT_SRP). .
[0141]
Therefore, for the audio / video title (AVTT / AOTT), the image dedicated title search pointer (AVTT_SRP) is described in the ATT search pointer table 242, but the audio only title search pointer (AVTT_SRP) is described in the AOTT search pointer table 243. AOTT_SRP) will be described.
[0142]
For the image-only title (AVTT), only a frame for writing the title search pointer is prepared, but no substantial information is described, or this title does not have AOTT_SRP (reproduction only for audio) Not possible) is described. This is because the AOTT search pointer table 243 describes navigation information for the audio player, and the audio player cannot reproduce AV information. Therefore, the audio player determines that the title cannot be reproduced, and ignores this description.
[0143]
With reference to the AOTT title search pointer table 243 described as above, the audio player performs the reproduction shown in the right column of FIG. That is, the image information titles # 4, 6, and 7 are ignored, and the audio information is reproduced for the titles # 1, 2, 3, and 5.
[0144]
(4.3.2) VMG, VTSI, title search pointer
The VMG 3 includes VMGI (VMG Information) that is a substantial part of the navigation information. The VMGI includes a VMGI management table 250 containing information such as the VMGI file size and recording address, and a title search pointer table (TT_SRPT) 251. The title search pointer table 251 is a table describing navigation information about the video player. Therefore, the video player refers to the title search pointer table (TT_SRPT) 251 and reproduces the title according to the procedure determined by the conventional video format. Therefore, there are two types of titles here, ie, an audio / video title (AVTT / AOTT) and an image-only title (AVTT), but the title search pointer table (TT_SRPT) 251 does not distinguish between the two. Are all described as TT_SRP.
[0145]
As described above, in the audio / video DVD, optimum navigation information is prepared for each of the audio player, the video player, and the compatible player, and recorded as three separate title search pointer tables. Thereby, optimal reproduction can be performed according to the capability of each reproducing apparatus.
[0146]
(4.4) Search pointer table structure
Next, the structure of the search pointer table will be further described.
[0147]
(4.4.1) ATT_SRP, AOTT_SRP, TT_SRP
The ATT search pointer table 242 includes ATT search pointer information 244 including information such as the number of ATT search pointers, and a plurality of ATT search pointers 245. In FIG. 8, the parentheses of each ATT search pointer indicate the type of search pointer actually described as the search pointer. As described above, the search pointer written in the ATT search pointer table 242 is either AOTT_SRP or AVTT_SRP.
[0148]
Similarly, the AOTT search pointer table 243 includes AOTT search pointer information 246 including information such as the number of AOTT search pointers, and a plurality of AOTT search pointers 247. In FIG. 8, the encirclement of each AOTT search pointer also indicates the type of search pointer actually described as the search pointer. As described above, the search pointers written in the AOTT search pointer table are all AOTT_SRP.
[0149]
The positions of the ATT search pointer and the AOTT search pointer that designate the same title on each search pointer table must be the same. That is, the ATT search pointer on the ATT search pointer table 242 and the AOTT search pointer on the AOTT search pointer table 243 have a one-to-one correspondence, and ATT_SRP # 1 and AOTT_SRP # 1 specify the same title. .
[0150]
Similarly, the TT search pointer table 251 includes TT search pointer information 252 including information such as the number of TT search pointers, and a plurality of TT search pointers 254.
[0151]
The ATT search pointer 245 and the AOTT search pointer 247 have a 1: 1 correspondence, but there is not necessarily a 1: 1 correspondence between the two and the TT search pointer. However, the TT search pointer is the same as the ATT search pointer and the AOTT search pointer in that the playback procedure is indicated by indicating the PGC that logically constitutes the target title.
[0152]
(4.5) How to play each title
Next, with reference to FIGS. 6 and 8, a description will be given of a method of reproducing each of the three types of titles that can be recorded on the audio / video DVD.
[0153]
(4.5.1) Audio only title (AOTT) playback method
An AOTT can be reproduced by an audio player and a compatible player. AOTT is a title for reproducing audio information. Further, main playback modes (functions) of audio-only titles to be realized or related in the present invention include the following. However, it also includes a playback mode that can be realized in playback of audio / video titles (AVTT / AOTT) on an audio player.
[0154]
Multi-channel playback:
In DVD audio format, up to 8 channels of LPCM audio information in the video zone are possible. As a discrete multi-channel, up to 6 channels are possible. In this case, it is possible to set 11 patterns for each channel from the combination of the front 3 channels + the rear 2 channels + subwoofer, and the combination of the discrete multichannel part and the signal for 2ch playback, a total of 24 patterns. . LPCM audio information in the audio zone can be up to 6 channels, and there are 21 patterns for each channel among the combinations of 3 front channels + 2 rear channels + subwoofer.
[0155]
2ch playback:
LPCM audio information of 2ch or less is reproduced as it is. Multi-channel LPCM audio information in the video zone is played back only for 2 channels of CH0 and CH1, and multi-channel LPCM audio information in the audio zone is downmixed to 2ch based on the downmix coefficient separately defined for each track and played back as 2ch. To do.
[0156]
Audio selection:
In DVD, audio information of two different playback formats can be defined as one title and can be selected by the user. This function is called audio selection. Specifically, the user can select different playback modes of 2ch and multi-channel for the same song. Also, as a choice other than 2ch and multi-channel, it is also possible to select and listen to LPCM recording audio information and audio information recorded by other coding methods (compressed sound, 1-bit sound, etc.) for the same song. .
[0157]
Audio coding modes (Linear PCM, Dolby AC3, MPEG audio, DTS, SDDS):
Indicates the type of encoding method used when recording audio information. The LPCM used for CDs is well known. The other is one of the compression coding systems.
[0158]
Multi-channel type:
The type of LPCM multi-channel recording in the DVD audio format is shown. For Type 1, up to 6 channels can be set. The relationship of the speaker arrangement for each channel can also be set in the combination of front 3 channels + rear 2 channels + subwoofer.
[0159]
Channel assignment (number of channels, speaker placement):
The number of channels, the relationship between each channel and the output speaker arrangement, and the relationship between each channel and a channel group in the multi-channel of the LPCM are shown. For example, when a 3ch signal is recorded, CH0 is included in channel group 1 as a signal output from the left front speaker: CH1 is included in channel group 1 as a signal output from the right front speaker: right front. CH2 is a surround speaker: a signal that is output from the rear and indicates that it is included in channel group 2. As described above, when the multi-channel type is Type 1, 21 patterns can be set in the combination of the front 3 channels + the rear 2 channels + the subwoofer, and the channel assignment information is any of the 21 patterns. Indicates whether it is a combination.
[0160]
Multi-stream:
Audio entity information recorded in the audio area in the DVD audio format is recorded as a single audio stream in the AOB, but audio entity information recorded in the video area is recorded in the VOB. Along with the stream, it is multiplexed and recorded for each pack. A VOB can multiplex a plurality of audio streams within a limited transfer rate range. For example, a 2ch / LPCM audio stream and a multi-channel / LPCM audio stream can be multiplexed, and a 2ch / LPCM audio stream and an AC-3 compressed audio stream can be multiplexed. These two audio streams having different playback forms can be selected by the user by designating an audio selection value.
[0161]
(4.5.1.1) Audio player
First, a method for playing an AOTT by the audio player will be described. As described above, the audio player refers only to AOTT_SRPT 243 as navigation information. Therefore, when the title # 2 is to be reproduced, the ATS_SRP # 2 is referred to, and the ATS number (ATS # 1 in this case) including the title and the title number in the ATS are read (FIG. 8, “ (See the path indicated by “P2A (1)”). Next, the ATSI 211 of the corresponding ATS # 1 is referred to (refer to the path indicated by “P2A (2)” in FIG. 8), and the A (Audio) PGCI corresponding to the title is read from the title number in the previous ATS. . Therefore, at the time of reproduction, audio information is reproduced by reproducing the audio pack 43 in the AOB 210 in accordance with APGCI designated by AOTT_SRP # 2 (see the path indicated by “P2A (3)” in FIG. 8).
[0162]
(4.5.1.2) For compatible players
Next, a method for a compatible player to play AOTT will be described. The compatible player refers to ATT_SRPT 242 as navigation information. Therefore, when title # 2 is to be reproduced, ATT_SRP # 2 is referred to, and since it is AOTT_SRP, it is recognized that the title is AOTT. Thereafter, as with the audio player, the ATS number (in this case, ATS # 1) and the title number in the ATS including the title are read (see the path indicated by “P2C (1)” in FIG. 8). ). Next, referring to the ATSI 211 of the corresponding ATS # 1 (refer to the path indicated by “P2C (2)” in FIG. 8), the APGCI corresponding to the title is read from the title number in the previous ATS. Therefore, at the time of reproduction, audio information can be reproduced by reproducing the audio pack 43 in the AOB 210 in accordance with the APGCI specified by ATT_SRP # 2 (see the path indicated by “P2C (3)” in FIG. 8).
[0163]
(4.5.2) Image-only title (AVTT)
Next, the reproduction path of the image-only title will be described. The video-only title can be played back by the video player and the compatible player.
[0164]
(4.5.2.1) Video player
The video player refers to TT_SRPT (title search pointer table) 251 as navigation information, and performs processing according to the playback procedure of the video format. Therefore, the title search pointer table 251 of VMG3 is first referred to. Here, the description position of the search pointer on the title search pointer tables 242 and 243 of the corresponding title on the audio navigation and the description position of the title search pointer on the title search pointer table 251 of VMG3 correspond to 1: 1. It does not have to be. In other words, the contents and order of the AMGI ATT search pointer table 242 and the VMGI TT search pointer table 251 can be defined independently. However, in order to avoid confusion, when there is no title corresponding to TT_SRP 254 of VMGI in the title search pointer table 251, as a general rule, the title search pointer table 251 is described with a frame packed in the TT search pointer table. Accordingly, the title number may be different as shown in FIG. That is, there are seven titles in the audio / video dual-use DVD in the example shown in FIG. 6, but the video player does not reproduce the titles # 2 and # 5 which are AOTTs. TT_SRP for titles (titles # 1, # 3, # 4, # 6, # 7) is described in the title search pointer table 251. Therefore, TT_SRP # 1- # 5 in the title search pointer table 251 corresponds to the titles # 1, # 3, # 4, # 6, and # 7 shown in FIG.
[0165]
TT_SRP 254 indicates a PGC that logically configures a target title. Therefore, the video player reads the VTS number (in this case, VTS # 1) including the title and the title number in the VTS from the search pointer (see the path indicated by “P3V (1)” in FIG. 8). ). Next, the VTSI 11 of the corresponding VTS # 1 is referred to (refer to the path indicated by “P3V (2)” in FIG. 8), and the PGCI corresponding to the title is read from the title number in the previous VTS. Therefore, the video player acquires this PGCI and reproduces the title as AV information using a video pack, an audio pack, etc. in the VOB (refer to the path indicated by “P3V (3)” in FIG. 8).
[0166]
(4.5.2.2) For compatible players
Next, a description will be given of a path when the compatible player plays an image-only title (AVTT). The compatible player refers only to ATT_SRPT 242 as navigation information. Therefore, this ATT_SRP # 4 is referred to, and since it is AVTT_SRP, it is recognized that the title is an image-only title. As described above, it does not match the title number in the video player. However, thereafter, the VTS number (in this case, VTS # 1) including the title and the title number in the VTS and the title number in the VTS are read from the ATT_SRP 245 in the same manner as the video player reads from the TT_SRPT (FIG. 8, (See the path indicated by “P4C (1)”). Next, the VTSI 11 of the corresponding VTS # 1 is referred to (refer to the path indicated by “P4C (2)” in FIG. 8), and the PGCI corresponding to the title is read from the title number in the previous VTS. Therefore, the compatible player also acquires this PGCI, and uses the video pack, audio pack, etc. in the VOB to reproduce the title as AV information (see the path indicated by “P4C (3)” in FIG. 8).
[0167]
(4.5.2.3) Audio player
Next, the case of an audio player will be described. The audio player refers only to AOTT_SRPT243 as navigation information. Therefore, although AOTT_SPR # 4 is read, since it is written that there is no corresponding AOTT, reproduction is stopped.
[0168]
(4.5.3) In the case of video / audio mixed titles (AVTT / AOTT)
The video / audio mixed title is played back by all the audio players, video players, and compatible players. Therefore, it demonstrates in this order.
[0169]
(4.5.3.1) Audio player
First, a method for reproducing an audio / video title by an audio player will be described. The audio player refers only to AOTT_SRPT243 as navigation information. Therefore, AOTT_SRP # 1 is referred to, and the ATS number (ATS # 3 in this case) including the title and the title number in the ATS are read (see the path indicated by “P1A (1)” in FIG. 8). ). Next, referring to the ATSI 212 of the corresponding ATS # 3 (see the path indicated by “P1A (2)” in FIG. 8), the APGCI corresponding to the title is read from the title number in the previous ATS. However, this ATS # 3 does not include audio data as an entity, and this APGCI indicates a playback procedure for the VOB 10 of VTS # 1. Therefore, at the time of reproduction, only the audio information is reproduced by reproducing only the audio pack 43 in the VOB 10 in accordance with this APGCI (see the path indicated by “P1A (3)” in FIG. 8).
[0170]
(4.5.3.2) Video player
Next, a method for reproducing a video / audio title by the video player will be described. As described above, the video player performs processing according to the playback procedure of the video format regardless of the type of the disc. Therefore, first, the title search pointer table 251 of VMG3 is referred. The title number here is # 1, which matches the title number on the audio navigation. Since the subsequent paths are the same as in the case of (5.2.1), description thereof is omitted (see the paths shown in FIG. 8, “P1V (1), (2), (3)”).
(4.5.3.3) For compatible players
Next, a method for playing back a video / audio title by a compatible player will be described. The compatible player refers only to ATT_SRPT 242 as navigation information. Therefore, it is recognized that it is AVTT with reference to this ATT_SRP # 1. Thereafter, the VTS number (in this case, VTS # 1) including the title and the title number in the VTS and the title number in the VTS are read from the ATT_SRP 245 in the same manner as the video player reads from the TT_SRPT 251 (FIG. 8, “P1C (See the path indicated by (1)). Since the subsequent paths are the same as those in the video player, the description thereof will be omitted (see the paths indicated by “P1C (2) and P1C (3) in FIG. 8).
[0171]
As described above, not only has navigation information for video and navigation information for audio, but also has information that integrates them or information that associates them, so that titles with different playback formats can be played back. Contradiction and confusion when playing with various players with different abilities can be eliminated.
[0172]
(5) Title management information
As described above, the user selects a desired title group or a track included therein, and instructs playback. The playback device automatically selects a title that includes the specified title group or includes the specified track according to the capability of the playback device, and starts playback.
[0173]
Further, the DVD audio format has a logical structure in which audio information can be selected when an audio title (AOTT) or a video / audio mixed title (AVTT / AOTT) is reproduced by an audio player. Regarding the structure for realizing this function, the navigation information will be described first with reference to FIG. FIG. 9 is a block diagram showing in detail the structure of the ATS 203 shown in FIG. 3 or FIG.
[0174]
(5.1) ATSI
As described above, the ATS 203 includes the ATSI 211 as navigation information, the AOTT_AOBS 10 ′ as a collection of audio entity information (AOTT_AOB 210), and the ATSI_BUP 213 as a backup of the ATSI 211.
[0175]
Further, as shown in FIG. 9, the ATSI 211 is composed of ATSI_MAT 270 as management information and ATS_PGCIT 271 which is a table of reproduction control information.
[0176]
(5.1.1) ATSI_MAT
The management information ATSI_MAT 270 describes address information of various tables, attribute information related to audio entity information, downmix coefficients, and the like.
[0177]
(5.1.1.1) Attribute information
In the attribute information, for the AOTT_AOB 210 included in the AOTT_AOBS 210 ′, for each AOTT_AOB 210, the coding method, sampling frequency, number of quantization bits, number of channels, multi-channel type, channel assignment, and the like are described. As described above, when the AOTT_AOBS 210 ′ is present in the ATS 203, a plurality of types of audio information are separately recorded in the AOTT_AOBS 210 ′ as different AOTT_AOB210. Some ATSs 203 do not have AOTT_AOBS 210 ′, and attribute information in this case describes attribute information related to the audio stream of VOB (AOTT_VOB, AVTT_VOB) 10 recorded in the video zone. Therefore, when a plurality of types of audio information are recorded in the VOB 10 as a plurality of streams in the VOB 10, the stream number and the attribute information are described here for each stream.
[0178]
(5.1.2) ATS_PGCIT
The ATS_PGCIT 271 is composed of an ATS_PGCITI 272 describing information relating to the entire playback control table, a table 275 of a search pointer (ATS_PGCI_SRP) 275 for searching for playback control information corresponding to the title, and a table 274 of the playback control information (ATS_PGCI) 276 itself. The
[0179]
(5.1.2.1) ATS_PGCI_SRP
In the present invention, a plurality of different types of audio information are recorded on the disc, and in principle, the audio information having a common recording target is handled as the same work and the same song, as shown in FIGS. A PGC 300 is introduced as management information, and a plurality of different types of audio information are related to one title 261. Although details of the audio information management method using the PGC 300 will be described later, in the present invention, when a plurality of different types of audio information are related to one title 261, a logical structure in which the PGC 300 is blocked is used. Have.
[0180]
The reproduction control information of the audio entity information managed by the PGC 300 is ATS_PGCI 276, and each title is stored in ATS_PGCI_SRP 275. 261 Information for searching for ATS_PGCI 276 corresponding to is described. For example, for each ATS_PGCI 276, whether or not the PGC 300 is an entry is described. The entry is information indicating that the PGC 300 represents the PGC block. The ATS_PGCI_SRP 275 includes a title number in the ATS 203, whether or not a PGC block is formed, a relationship in the PGC block (first, in block, last), block type, number of channels, encoding method, ATS_PGCI 276 A start address and the like are described.
[0181]
As described above, at the start of the title playback, it has been described that the corresponding ATS_PGCI 276 is obtained with the ATS_SRP 247 of the AMG 202 using the ATS number and the ATS title number. However, when the ATS_PGCI_SRP 275 of the corresponding ATS 203 is viewed, the ATS title The location where the ATS_PGCI 276 is recorded is known.
[0182]
Further, when a plurality of audio information corresponds to one title, a plurality of ATS_PGCI_SRP 275 having the same ATS title number exists. In this case, the optimum PGC 300 is selected in combination with other information (block type, number of channels, encoding method), and playback is started.
[0183]
(5.1.2.2) ATS_PGCI
Subsequent to the search pointer table, ATS_PGCI 276 as reproduction control information corresponding to each title is arranged to constitute a table.
[0184]
In the present invention, in order to manage the audio entity information by the PGC 300, the classification information called the program 301 is used as shown in FIG. The program 301 is information that divides the above-described cell 220 by a playback unit such as one song, and is information corresponding to the track 260. Therefore, the PGC 300 corresponding to the title 261 manages one or a plurality of programs 301, and this information is described in the ATS_PGCI 276.
[0185]
One ATS_PGCI 276 includes information about the entire PGC 300 (ATS_PGC_GI) 290, a table ATS_PGIT291 that collects information about each program 301 that configures the PGC 300, and a table ATS_C_PBIT292 that collects information about each cell 220 that configures the program 301. The
[0186]
(5.1.2.2.1) ATS_PGC_GI
In the ATS_PGC_GI 290, the number of programs, the number of cells, the PGC playback time, the start address of each table following this information, etc. are described as information relating to the entire PGC 300.
[0187]
(5.1.2.2.2) ATS_PGIT
Subsequent to the ATS_PGC_GI 290, information ATS_PGI relating to the program 301 constituting the PGC 300 is arranged in the reproduction order by the number of programs to form a table ATS_PGIT291. One ATS_PGI includes information for continuous reproduction, information for specifying the attribute of audio entity information (AOB) reproduced by the program, information for specifying a downmix coefficient, and a cell number corresponding to the head of the program. , Start PTS, program playback time, and the like are described.
[0188]
The information for specifying the attribute of the ATS_PGI is the details of the program for the first time by specifying the attribute information of the audio entity information specifically described in the ATSI_MAT 270 as an attribute number and making these correspond to each other. Attribute information can be obtained. Since the attribute number can be defined for each program, the DVD audio format has a structure in which the attribute can be changed for each song.
[0189]
However, the ATS_PGCI_SRP 275 includes information regarding attributes. The attribute information described in ATS_PGCI_SRP 275 is information for selecting different types of audio entity information, and is only a description of attribute information common to each program 301. Conversely, even if it can be said that the attribute can be freely set in units of programs, the encoding method must be common. When a PGC block is assembled, all programs 301 in the PGC 300 must comply with the restriction that the number of channels is unified to 2 ch or less or unified to 3 ch or more.
[0190]
In addition, the cell number corresponding to the head of the program indicates which cell 220 the program 301 corresponds to.
[0191]
(5.1.2.2.3) ATS_C_PBIT
Subsequent to ATS_PGIT 291, information ATS_C_PBI relating to the cells constituting the PGC 300 is arranged in the reproduction order by the number of cells to form a table ATS_C_PBIT 292. One ATS_C_PBI stores an index number, a cell type, a start address, an end address, and the like. Here, for the first time, the address on the disc of the audio entity information corresponding to the title 261 is known.
[0192]
For example, assume that the user has instructed the third song of a title group 262. It is assumed that the title group 262 includes one title 261. The acquisition of ATS_PGCI corresponding to the title 261 is as described above. Since it is the third song, the third ATS_PGIT 291 corresponding to the program # 3 is read, and the first cell number #n is obtained. Since it was found that the program 301 (# 3) starts from the cell 220 (#n), the n-th ATS_C_PBI is read, the start address described here is obtained, jumps there, and plays the third song. Will start.
[0193]
(5.2) Audio information recording method
Next, how a plurality of types of different audio information is recorded in this embodiment will be described.
[0194]
As described in the description of the physical structure of each audio disc, the ATS 203 and the VTS 3 include the AOB 210 as audio entity information and the VOB 10 as AV entity information, respectively. Further, entity information reproduced as an audio title is also referred to as AOTT_AOB and AOTT_VOB, respectively. AOTT_AOBS and AOTT_VOBS are a group of a plurality of AOTT_AOB and AOTT_VOB, respectively.
[0195]
A plurality of different types of audio information are specifically classified into the following three types.
[0196]
a. Multiple audio information with different recording conditions (for example, normal recording and binaural recording, recording in front of the hall and recording in the S seat, one-point recording and multi-microphone recording, etc.)
b. Multiple audio information with different encoding methods (for example, LPCM, MPEG, Dolby AC-3, SDDS, DTS, etc.)
c. Multiple pieces of audio information with different playback formats (number of channels is 2ch or less or 3ch or more)
The recording situation, encoding method, and playback mode can be determined independently. However, the plurality of different types of audio information targeted here are, in principle, audio information with a common recording target and should be treated as the same work (title) and the same song (track). The plurality of different types of audio information are recorded on the disc by two different methods.
[0197]
(5.2.1) AOTT_VOBS with multiple audio streams
Even in the DVD audio format, the recording method of audio information when accompanied by image information is the same as the DVD video format in order to be compatible with the DVD video format. Therefore, when recording a plurality of different types of audio information together with image information, they are multiplexed and recorded as separate streams on the same entity information (AOTT_VOB). As described in the video format, the VOB 10 defines image information, audio information, and sub-picture information as separate streams, which are divided into pack units (2048 bytes), multiplexed in this unit, One system stream is recorded on the disc.
[0198]
Here, since up to eight types of audio information can be defined, different types of audio information can be recorded as separate streams having different stream numbers. When such a recording method is adopted, compatibility with the DVD video format can be achieved. In addition, there is an advantage that the type of audio information can be easily changed simply by changing the stream processed by the playback device during playback. Further, when viewed as a video title, since it is recorded in one entity information, it can naturally be handled as the same title and the same track. Therefore, a plurality of audio information having different numbers of channels can be recorded appropriately without causing confusion to the user.
[0199]
However, such a stream multiplexing method is inappropriate for an audio format. In a DVD disc, there is a limitation that the total data transfer rate of all streams must be 10.08 Mbps or less. Therefore, it is impossible to multiplex two streams as shown in Table 1 below.
[0200]
[Table 1]

[0201]
In an audio DVD, it is necessary to record uncompressed LPCM audio. Therefore, when the sampling frequency is high or the number of channels is large, the required data transfer rate is high. Therefore, when the audio information is mainly used and mainly a plurality of uncompressed LPCM sounds are to be recorded, it can be said that this stream multiplexing method is inappropriate.
[0202]
In addition, audio formats are required to have a recording function and consistency with currently used studio equipment, and are particularly required to be easily processed during recording. When a structure such as a video stream and a plurality of variable rate streams is multiplexed as in the DVD video format, management information must be placed in the data. In addition, the management information has a structure in which address information relating to several minutes of data is described, and when considered as a recording device, the data cannot be recorded on the disk unless the data for the previous and subsequent data are available. Therefore, there arises a problem that a simple recorder cannot be constructed. In addition to the current studio equipment, a new authoring device is required. There is also a problem.
[0203]
(5.2.2) Multiple blocks AOTT_AOBS
When only audio information is recorded, solving the above-mentioned problems is a more important issue, and a structure required as an audio format is adopted. Therefore, only one type of audio stream is recorded in one entity information (AOTT_AOB). When a plurality of different types of audio information are recorded, another entity information (AOTT_AOB) is recorded in another area on the disc. It was decided to record separately. In this way, as long as the data transfer rate of one piece of audio information is 10.08 Mbps or less, any number of data can be recorded. Also, since only one type of audio stream is recorded, if the audio information is fixed rate data such as uncompressed LPCM, there is no need to put management information in the data and the processing at the time of recording is simple. It becomes.
[0204]
Further, it is not necessary to simultaneously reproduce 2ch audio information and multi-channel audio information, and there is not much need for instantaneous switching. Accordingly, when recording is performed separately in separate entity information, the processing accompanying switching at the time of reproduction becomes complicated, but it can be said that it is not a big problem.
[0205]
However, in this case, a mechanism for handling a plurality of entity information as the same title is required. Also, it is necessary to uniformly handle audio information recorded as a plurality of streams in AOTT_VOB with the same mechanism.
[0206]
(5.3) Audio selection
As described above, there are roughly two methods for recording a plurality of different types of audio information, but each has a problem. Therefore, the present invention solves the problems in the respective methods by providing the following logical structure in the reproduction control information, and enables appropriate audio selection. Here, audio selection refers to switching a plurality of different types of audio information recorded in different areas on the disc that need to be handled as the same title.
[0207]
First, when adopting a method of recording a plurality of different kinds of audio information separately as different entity information (AOTT_AOB) in another area on the disc, as shown in FIG. (In the case of FIG. 10, for recording of a plurality of pieces of audio entity information having different recording formats: 2ch and multich (in this case, audio titles, AOTT_AOB210 (AOB # 1, AOB # 2))) The cells 220 constituting each AOB 210 are divided into units of a program 301 as a second division unit. Each program 301 is identified by a program number (# 1, # 2, # 3,...) As second division information. The program 301 is a reproduction unit corresponding to the track 260, and corresponds to, for example, one song. Therefore, although the audio entity information (AOTT_AOB210 (AOB # 1, AOB # 2)) has the same content although the recording method is different, the number and order of the programs 301 for each audio entity information are equal. . In the case of FIG. 10, the programs are composed of programs # 1, # 2, and # 3, respectively.
[0208]
Next, the respective programs 301 (programs # 1, # 2, and # 3) are collected by the respective separate PGCs 300 (PGC # 1 and PGC # 2) as management information. These PGCs 300 (PGC # 1, PGC # 2) are made to correspond to the same track 261 (track # 1 in the case of FIG. 10), so that the same track 260 (# 1) can A program 301 (program # 1, # 2, # 3) including audio entity information with different recording methods is associated. In other words, the present invention is audio entity information in units of programs identified by the program number as the second division information, and the audio entity information having a different recording method is used as the track number (# 1, # 1) as the first division information. # 2, # 3,...) As a first division unit, and the same track 261 having the same track number is used by using different PGCs 300 that are blocked as management information. It is related.
[0209]
In this way, even when a method of separately recording a plurality of different types of audio information as different entity information (AOTT_AOB) in another area on the disc is used, the same title and the same are received from the user. By selecting the PGC 300 that manages the audio entity information of the recording method that is recognized as a song of the user and that matches the user's instruction or the capability of the playback device, a plurality of different types of audio entity information can be handled in a unified manner.
[0210]
Next, when adopting a method of recording audio entity information having a different recording method by a stream multiplexing method in a recording area of the video format, as shown in FIG. 11, audio entity information AOTT_VOB10 (in the case of FIG. 11, VOB # 1) is divided into separate PGCs 300 (PGC # 1 and # 2 in the case of FIG. 11) provided for each recording method (in the case of FIG. 11, recording format: 2ch and multi-ch). And related to the same track 261 (track # 1 in the case of FIG. 11). Each PGC 300 manages the program 301 (programs # 1, # 2, and # 3 in the case of FIG. 11) as in the case of FIG.
[0211]
By adopting such a logical structure, the recording system of each audio entity information is managed by each PGC 300. Therefore, the PGC 300 can be controlled according to the recording system without directly referring to the navigation information in the audio stream. Only by selecting, it is possible to appropriately reproduce audio information of a desired recording method. That is, according to the present invention, the audio information recorded in the video format can be managed by the audio format control information. Of course, even in this case, the user recognizes the same title and the same song. Therefore, by selecting a PGC that matches the user instruction or the capability of the playback device, a plurality of different types of audio information can be handled uniformly.
[0212]
As described above, according to the present invention, even when audio information is recorded in AOTT_AOB (when reproducing an audio title) or when recorded in AOTT_VOB (when reproducing an audio / video title). The audio selection can be performed by the same mechanism, and the present invention is effective when the audio title (AOTT) or the video / audio title (AVTT / AOTT) is reproduced by the audio player.
[0213]
Further, how this audio selection is performed will be described with reference to FIGS.
[0214]
(5.3.1) Audio selection in audio titles
First, a case where an audio title is played back by an audio player or a compatible player will be described. Here, it is assumed that all title groups are composed of one title. Assume that the playback device is dedicated to 2ch or that the user is set to select 2ch playback. Further, it is assumed that the user gives an instruction to reproduce the title group 262 (#j).
[0215]
As described above, the ATS number and ATS title number of the title corresponding to the title group 262 are acquired by referring to the AOTT_SRP 247 (see FIG. 8). As a result, it is assumed that the ATS number is # 2 and the ATS title number is # 3. The flow up to this point is as described in (4.5.1.1) Audio player and (4.5.1.2) Compatible player.
[0216]
Next, the ATSI 211 of the ATS # 2 is read, and attribute information written in the ATSI_MAT 270 is stored (see the path indicated by “P12 (1)” in FIG. 12). At this stage, the attribute of each track of the title to be played cannot be specified. For the time being, all attribute information is stored.
[0217]
Subsequently, the ATS_PGCIT 271 is read, and the PGCI search pointer (ATS_PGCI_SRP) 273 is read (see the path indicated by “P12 (2)” in FIG. 12). In this table, an ATS_PGCI_SRP 273 whose ATS title number (ATS_TTN) is # 3 is searched. In this case, there are two ATS_PGCI_SRP 273 with the ATS title number # 3 as the first division information (# 3 and # 4), and it can be seen that the PGC block is configured. Therefore, it is determined which PGC 300 is selected. In this case, since the playback device is dedicated to 2ch or the user is set to select 2ch playback, the block type item is viewed. Here, it is written that the PGC block is assembled due to the difference in the number of channels. Next, referring to the item 284 of Audio channels (see FIGS. 9 and 12), select the PGC 300 that is written as 2ch or less. To do. Then, the address (in this case, 16384) where the playback control information ATS_PGCI 276 of the selected PGC 300 is written is acquired, jumps to the address, reads the playback control information, and stores it (shown as “P12 (3)” in FIG. 12). See path).
[0218]
The reproduction control information includes an information table related to the track 260 and an information table related to the program 301 and an information table related to the cell 220. When playback is started from the beginning of the title, the ATS_PGI of the program # 1 is looked at and the attribute of the program # 1 is specified using the information specifying the attribute of the program # 1 and the attribute information stored previously. Set the audio decoder according to this attribute. Next, the first cell number of the program # 1 is read from the ATS_PGI (in this case, since the program # 1 is to be reproduced, the first cell number is naturally # 1), and the cell from the ATS_C_PBI corresponding to the number is read. The recorded address 220 is read, jumping to the address and starting playback (see the path shown in FIG. 12, “P12 (4)”).
[0219]
In the case of normal reproduction, cell reproduction is continued using ATS_C_PBI stored in the memory being reproduced until the next program is reached. When the reproduction of the program is finished, this also uses the ATS_PGI and attribute information in the memory to perform a series of processing for the next program reproduction and start the reproduction. This operation is repeated until the title ends. Therefore, as described above, all the attribute information in the management information and the reproduction control information ATS_PGCI must be stored.
[0220]
Next, it is assumed that the playback device supports multi-channel playback and the user is set to select multi-channel playback. Further, it is assumed that the user gives an instruction to reproduce the title group 262 (#j).
[0221]
The ATS number # 2 and ATS title number # 3 of the title corresponding to the title group 262 are acquired, and the ATSI 211 of the ATS # 2 is read. The processing up to this point is the same as when 2ch playback is selected (see the path indicated by “P1M (1)” in FIG. 12). Also, attribute information written in ATSI_MAT 270 of ATSI 211 is stored, ATS_PGCIT 271 is read, and ATS_PGC search pointer 273 is read (refer to the path indicated by “P1M (2)” in FIG. 12). The processing so far is the same as when 2ch playback is selected.
[0222]
In this table, an ATS_PGC_SRP 273 whose ATS title number (ATS_TTN) is # 3 is searched. In this case, it can be seen that there are two ATS_PGCI_SRPs with an ATS title number of # 3 (# 3 and # 4) and constitute a PGC block. Therefore, it is determined which PGC 300 is selected. In this case, since the playback apparatus supports multi-channel playback and the user is set to select multi-channel playback, the block type item is viewed. Here, since it is written that PGC blocks are assembled due to the difference in the number of channels, next, the PGC 300 written as 3ch or more is selected by looking at the item 284 of Audio channels. Then, the address (in this case, 24576) in which the reproduction control information ATS_PGCI 276 of the selected PGC 300 is written is acquired, jumps there, reads the reproduction control information, and stores it (shown as “P1M (3)” in FIG. 12). See path).
[0223]
Subsequent processing is basically the same as when 2ch playback is selected, except that the PGC 300 to be processed is different and the actual information to be played back is different. The ATS_PGI of the program # 1 is looked up from the information table regarding the program in the reproduction control information, the attribute of the program # 1 is specified, and the audio decoder is set. Next, the ATS_C_PBI of the first cell number # 1 of the program # 1 is read from the ATS_PGI, the recorded address of the cell # 1 is read, jumps there and starts playback (in FIG. 12, “P1M (4)”) See the path shown).
[0224]
(5.3.2) Audio selection for video / audio titles
A case where an audio / video title is reproduced by an audio player will be described. Here, it is assumed that all the title groups 262 are composed of one title. Assume that the playback device is dedicated to LPCM or the user is set to select LPCM playback. Further, it is assumed that the user gives an instruction to reproduce the title group 262 (#j).
[0225]
As described above, the ATS number and ATS title number of the title 261 corresponding to the title group 262 are acquired by referring to the AOTT_SRP 247. As a result, the ATS number is # 2, and the ATS title number is # 4. The flow up to this point is as described in (4.5.3.1) Audio player.
[0226]
Next, the ATSI 212 of the ATS # 2 is read, and attribute information written in the ATSI_MAT 270 is stored (see the path indicated by “P2L (1)” in FIG. 13). At this stage, the attribute of each track of the title to be played cannot be specified. For the time being, all attribute information is stored. In this case, since the video / audio mixed title is to be reproduced, the corresponding ATS 203 is an ATS having only the navigation information without the entity information.
[0227]
Subsequently, the ATS_PGCIT 271 is read, and the PGCI search pointer 273 is read (see the path indicated by “P2L (2)” in FIG. 13). In this table, the ATS_PGCI_SRP 273 whose ATS title number (ATS_TTN) is # 4 is searched. In this case, it can be seen that there are two ATS_PGCI_SRPs 273 with the ATS title number # 4 (# 4 and # 5) and constitute a PGC block. Therefore, it is determined which PGC 300 is selected.
[0228]
In this case, since the playback device is dedicated to LPCM or the user is set to select LPCM playback, the block type item is viewed. Here, it is written that the PGC block is assembled due to the difference in the number of channels and the encoding method. Next, the PGC 300 written as LPCM is selected by looking at the item 285 of the audio coding mode.
[0229]
Next, an address (in this case, 24576) in which the reproduction control information ATS_PGCI 276 of the selected PGC is written is acquired, jumps there, reads and stores the reproduction control information (FIG. 13, “P2L (3)”) (See the path indicated by)
[0230]
The reproduction control information includes an information table related to the program 301 and an information table related to the cell 220 corresponding to the track 261. When playback is started from the beginning of the title, the ATS_PGI of the program # 1 is viewed, and the attribute of the program # 1 is specified using the information specifying the attribute of the program # 1 and the attribute information stored previously. Set the audio decoder according to this attribute. Next, the first cell number of the program # 1 is read from the ATS_PGI (in this case, since the program # 1 is to be reproduced, the first cell number is naturally # 1), and the cell from the ATS_C_PBI corresponding to the number is read. Is read and jumps to the address to start reproduction (see the path indicated by “P2L (4)” in FIG. 13).
[0231]
In the case of normal reproduction, cell reproduction is continued using ATS_C_PBI stored in the memory being reproduced until the next program is reached. When the reproduction of the program is finished, this also uses the ATS_PGI and attribute information in the memory to perform a series of processing for the next program reproduction and start the reproduction. This operation is repeated until the title ends. Therefore, as described above, all the attribute information in the management information and the reproduction control information ATS_PGCI must be stored.
[0232]
Next, it is assumed that the playback apparatus supports multi-channel playback and AC-3 (a kind of encoding scheme: Dolby Digital) and is set so that the user selects playback of AC-3. Further, it is assumed that the user gives an instruction to reproduce the title group 262 (#j).
[0233]
The ATS number # 2 and the ATS title number # 4 of the title 261 corresponding to the title group 262 are acquired, and the ATSI 211 of the ATS # 2 is read. The processing up to this point is the same as when LPCM playback is selected (see the path indicated by “P2A (1)” in FIG. 13). Further, the attribute information written in the ATS_MAT 270 of the ATSI 211 is stored, the ATS_PGCIT 271 is read, and the ATS_PGC search pointer 273 is read (see the path indicated by “P2A (2)” in FIG. 13). The processing up to this point is the same as when LPCM playback is selected.
[0234]
In this table, the PGC 300 whose ATS title number (ATS_TTN) is # 4 is searched. In this case, it can be seen that there are two PGCs with the ATS title number # 4 and constitute a PGC block. Therefore, it is determined which PGC 300 is selected.
[0235]
In this case, since the playback apparatus supports multi-channel playback and AC-3 and the user is set to select playback of AC-3, the block type item is viewed. Here, it is written that the PGC block is assembled due to the difference in the number of channels and the encoding method. Next, referring to the item 285 of the Audio coding mode, the PGC written as AC-3 is selected. Then, the address (in this case, 32768) in which the reproduction control information ATS_PGCI 276 of the selected PGC is written is acquired, jumps there, reads the reproduction control information, and stores it (shown by “P2A (3)” in FIG. 13). See path).
[0236]
The subsequent processing is basically the same as when LPCM playback is selected, except that the PGC to be processed is different and the stream to be played is different. The ATS_PGI of the program # 1 is looked up from the information table regarding the program in the reproduction control information, the attribute of the PG # 1 is specified, and the audio decoder is set. Next, the ATS_C_PBI of the first cell number # 1 of the program # 1 is read from the ATS_PGI, the recorded address of the cell # 1 is read, jumps there and starts playback (in FIG. 13, “P2A (4)”) See the path shown). However, since the entity information (AOTT VOB) to be reproduced is the same in this case, the jump destination address is also the same as when LPCM reproduction is selected.
[0237]
(6) Playback device
(6.1) Video DVD player
As shown in FIG. 14, the video DVD player according to the embodiment includes a pickup 80, a demodulation / correction unit 81, stream switches 82 and 84, a track buffer 83, a system buffer 85, a demultiplexer 86, and a VBV. (Video Buffer Verifier) buffer 87, video decoder 88, sub-picture buffer 89, sub-picture decoder 90, mixer 91, audio buffer 92, audio decoder 93, input unit 98, display 99, A system controller 100, a drive controller 101, a spindle motor 102, and a slider motor 103 are included. The configuration shown in FIG. 14 describes only the portion related to the reproduction of video and audio in the configuration of the video DVD player, and the servo for servo-controlling the pickup 80, the spindle motor 102, the slider motor 103, and the like. Since the circuit and the like are the same as those of the prior art, the description and detailed description are omitted.
[0238]
Next, the operation will be described.
[0239]
The pickup 80 includes a laser diode (not shown), a beam splitter, an objective lens, a photodetector, and the like, and irradiates the DVD 1 with the light beam B as reproduction light and receives the reflected light from the DVD 1 of the light beam B. The detection signal Sp corresponding to the information pit formed on the DVD 1 is output. At this time, the light beam B is accurately applied to the information track on the DVD 1 and is focused on the information recording surface on the DVD 1 with respect to an objective lens (not shown) in the same manner as the conventional technique. Thus, tracking servo control and focus servo control are performed.
[0240]
The detection signal Sp output from the pickup 80 is input to the demodulation and correction unit 81, subjected to demodulation processing and error correction processing to generate a demodulation signal Sdm, and is output to the stream switch 82 and the system buffer 85.
[0241]
The stream switch 82 to which the demodulated signal Sdm is input is controlled to open and close by the switch signal Ssw1 from the drive controller 101. When the stream switch 82 is closed, the input demodulated signal Sdm is directly passed through and output to the track buffer 83. On the other hand, when the stream switch 82 is opened, the demodulated signal Sdm is not output, and unnecessary information (signal) is not input to the track buffer 83.
[0242]
The track buffer 83 to which the demodulated signal Sdm is input is configured by a FIFO (First In First Out) memory or the like, temporarily stores the input demodulated signal Sdm, and when the stream switch 84 is closed, The stored demodulated signal Sdm is continuously output.
[0243]
The stream switch 84 to which the demodulated signal Sdm is continuously input is used in the system so that in the demultiplexing process in the demultiplexer 86, the various buffers in the subsequent stage do not overflow or conversely become empty and the decoding process is not interrupted. Opening and closing is controlled by a switch signal Ssw2 from the controller 100.
[0244]
On the other hand, the system buffer 85 to which the demodulated signal Sdm is input in parallel with the track buffer 83 is detected first when the DVD 1 is loaded, and management information (such as VMG2) related to the entire information recorded on the DVD 1 or for each VTS 3 The VTS 11 is accumulated and output to the system controller 100 as control information Sc, and the DSI data 51 for each navigation pack 41 is temporarily accumulated during reproduction and output to the system controller 100 as control information Sc.
[0245]
In the demultiplexer 86 to which the demodulated signal Sdm is continuously input via the stream switch 84, video data, audio data, sub-picture data, and PCI data for each navigation pack are extracted from the demodulated signal Sdm for each pack. The video signal Sv, the sub-picture signal Ssp, the audio signal Sad, and the PCI signal Spc are output to the VBV buffer 87, the sub-picture buffer 89, and the audio buffer 92, respectively.
[0246]
At this time, the demultiplexer 86 extracts a pack header, a packet header, and the like from each pack (including the audio pack 43) and the packet, and outputs information included in each to the system controller 100 as a header signal Shd.
[0247]
The VBV buffer 87 to which the video signal Sv is input is constituted by a FIFO memory or the like, temporarily stores the video signal Sv, and outputs it to the video decoder 88. The VBV buffer 87 is for compensating for variations in the data amount for each picture (see FIG. 2) in the video signal Sv compressed by the MPEG2 system. Then, the video signal Sv compensated for the variation in the data amount is input to the video decoder 88, demodulated by the MPEG2 system, and output to the mixer 91 as a demodulated video signal Svd.
[0248]
On the other hand, the sub picture buffer 89 to which the sub video signal Ssp is input temporarily stores the input sub video signal Ssp and outputs it to the sub picture decoder 90. The sub picture buffer 89 is for outputting the sub picture data 44 included in the sub video signal Ssp in synchronization with the video data 42 corresponding to the sub picture data 44. Then, the sub video signal Ssp synchronized with the video data 42 is input to the sub picture decoder 90, demodulated, and output to the mixer 91 as a demodulated sub video signal Sspd.
[0249]
The demodulated video signal Svd output from the video decoder 88 and the demodulated sub-video signal Sspd output from the sub-picture decoder 90 (synchronized with the corresponding demodulated video signal Svd) are mixed by the mixer 91, The video signal Svp to be finally displayed is output to a display unit such as a CRT (Cathod Ray Tube) (not shown).
[0250]
The audio buffer 92 to which the audio signal Sad is input is configured by a FIFO memory or the like, temporarily stores the input audio signal Sad, and outputs it to the audio decoder 93. The audio buffer 92 is for outputting the audio signal Sad in synchronization with the video signal Sv including the corresponding video information or the sub-video signal Ssp based on the header control signal Shc output from the system controller 100. The audio signal Sad is delayed according to the output status of the corresponding video information. Then, the audio signal Sad time-adjusted so as to be synchronized with the corresponding video information is output to the audio decoder 93, and based on the header control signal Shc output from the system controller 100, reproduction processing in the linear PCM system is performed. Then, it is output to a speaker or the like (not shown) as a demodulated audio signal Sadd. Note that an audio DVD containing only music information does not require synchronization processing with video information.
[0251]
(6.2) Audio DVD player
Next, the above-described audio DVD player will be described with reference to FIG. As shown in FIG. 15, the audio DVD player has the same configuration as that of the video DVD player shown in FIG. Therefore, the components after the demultiplexer 86 will be described.
[0252]
In the demultiplexer 86 to which the demodulated signal Sdm is continuously input via the stream switch 84, the audio information is extracted for each pack from the demodulated signal Sdm, and is output to the audio buffer 92 as the audio signal Sad.
[0253]
The audio buffer 92 to which the audio signal Sad is input is configured by a FIFO memory or the like, temporarily stores the input audio signal Sad, and outputs it to the audio decoder 93. The audio signal Sad is input to the audio decoder 93 and is subjected to reproduction processing in the linear PCM system based on the control signal Shc output from the system controller 100, and is output as a demodulated audio signal Sadd to a speaker (not shown). .
[0254]
For example, real-time information such as real-time text is output from the demultiplexer to the RTI buffer. The data temporarily stored in the RTI buffer is output to the RTI decoder based on the control signal Shc output from the system controller 100, and the lyrics and the like are displayed on a display device (not shown).
[0255]
When it is detected that it is necessary to temporarily suspend (pause) the audio immediately after the access to the desired information, the system controller 100 outputs a pause signal Sca to the audio decoder 93. The audio decoder 93 temporarily stops outputting the demodulated audio signal Sadd.
[0256]
FIG. 16 shows the configuration of the audio decoder 93. As illustrated, the audio decoder 93 includes a signal processing unit 120 including a digital filter, a D / A converter 121, an analog output circuit 122 including an amplifier, a digital output circuit 123, and a system microcomputer 124 including a RAM 124a. And a clock circuit 125.
[0257]
The system microcomputer 124 exchanges a control signal Sca with the system controller 100 and controls operations of the clock circuit 125, the signal processing unit 120, the D / A converter 121, and the analog output circuit 122. The system microcomputer 124 has a RAM 124a inside. The RAM 124a temporarily stores audio attribute information supplied as a control signal Sca from the system controller 100. The system microcomputer 124 refers to the audio attribute information stored in the RAM 124 a and supplies the contents to the clock circuit 125 and the signal processing unit 120. Specifically, the system microcomputer 124 supplies the sampling frequency information in the audio attribute information to the clock circuit 125. The clock circuit 125 includes an oscillator and supplies the clock signal fs corresponding to the designated sampling frequency to the signal processing unit 120. Further, the system microcomputer 124 supplies the sampling frequency, the number of quantization bits, the number of channels, and the presence / absence of emphasis in the audio attribute information to the signal processing unit 120 and provides the D / A converter 121 with the number of channels information. Further, the system microcomputer 124 supplies information such as the amplification degree of the signal of each channel to the analog output circuit 122. Information on the degree of amplification for each channel can be included in the audio attribute information and supplied from the system controller 100.
[0258]
The signal processing unit 120 uses the clock signal fs from the clock circuit 125 and an audio buffer according to information such as a coding method (linear PCM or Dolby AC3) obtained from the system microcomputer 124, a sampling frequency, and the number of quantization bits. The audio signal supplied from 92 is decoded or band-limited, and further, de-emphasis processing is performed according to information on the presence / absence of emphasis, and output to the D / A converter 121. The D / A converter 121 divides the input signal for each channel according to the channel information obtained from the system microcomputer 124, and outputs the divided signal to the analog output circuit 122 as an analog signal for each channel. Further, the signal processing unit 120 outputs the digital audio signal Sadd to the outside via the digital output circuit 123.
[0259]
(6.3) Compatible DVD player
Although the compatible DVD player is not shown, the audio DV shown in FIG.
The D player includes a VBV buffer 87, a video decoder 88, a sub picture buffer 89, a sub picture decoder 90, and a mixer 91 in the video DVD player shown in FIG. Both of them can be played back.
[0260]
(7) Audio selection in playback device
Audio selection in the playback device refers to switching the type of audio information to be played back when the audio player plays back an audio title or a video / audio mixed title.
[0261]
As described in (5.2) Audio information recording method, the types of audio information are mainly classified into the following three types as described above.
[0262]
a. Recording status
b. Encoding method
c. Reproduction form
(7.1) When building a block according to the recording situation (binaural)
When the recording situation is different, it is sufficient to always switch according to the user's preference regardless of the capability of the apparatus, and there is no need for initial setting or the like. Further, in the case of binaural recording, the playback apparatus can implement the switching method as shown below.
[0263]
Here, binaural recording for realizing binaural reproduction will be described in detail.
[0264]
First, consider a case where a normal stereo signal is reproduced with headphones. For example, as shown in FIG. 2A, two microphones are arranged at predetermined positions in a concert hall, and the outputs of these microphones are reproduced by headphones. In this case, the reproduced sound field is generated at the back of the listener as shown by the oblique lines in FIG. This is because, in a normal stereo reproduction signal sound field using speakers, the sound image is completely localized on one speaker, so the level difference between the left and right speakers is required to be about 25 dB, while listening to headphones. This is because the sound is completely localized in one ear with a level difference of about 10 dB. Thus, when listening to normal stereo recorded music with headphones, there is a problem that the stereo effect is too strong and a natural sense of reality cannot be obtained.
[0265]
On the other hand, in binaural reproduction, a dummy head having substantially the same acoustic impedance and characteristics as those of an actual human is prepared, and a microphone is prepared around the ear canal of both ears of the dummy head, as shown in FIG. For example, this dummy head is placed in a concert hall seat, and the output of the microphone in the dummy head is reproduced by the headphones. When such binaural reproduction is performed, the sound field reproduced around the listener's head is in the range indicated by the diagonal lines in FIG. Therefore, a more natural sense of reality can be obtained in listening with headphones or earphones.
[0266]
In order to realize such binaural playback, it is binaural recording to record music using the dummy head as described above, and both such binaural and stereo recordings are recorded. For example, as shown in FIG. 18, by multiplexing and recording on a DVD disc, it is possible to perform appropriate reproduction according to the listening mode. Note that the recording method is not limited to the multiplexing method, and the audio entity information recorded in stereo and the audio entity information recorded in binaural recording may be recorded in different AOBs 210, respectively.
[0267]
Whether or not binaural playback is to be performed is determined based on whether or not a playback device is provided with a headphone jack 400 as shown by a dotted line in FIG. 15 and a headphone plug is inserted into the headphone jack 400, for example.
[0268]
The headphone jack 400 has a circuit configuration as shown in FIG. 19, for example, and a switch unit 401 that is pushed up by contact with the plug of the headphone is provided on both the upper and lower parts of the plug. When the switch unit 401 is pushed up, the switch unit 401 is opened, and it can be detected that the plug is inserted.
[0269]
With such a configuration, when a headphone plug is inserted into the headphone jack 400 and a song is designated by the user, the PGC 300 that manages the binaurally recorded audio entity information is selected according to the procedure described above, Audio entity information recorded in binaural recording is automatically played back.
[0270]
Therefore, the user can listen to the desired music recorded in the binaural manner by simply inserting the headphone plug into the headphone jack 400.
[0271]
Whether or not a headphone plug is inserted into the headphone jack 400 can be detected at an appropriate timing such as when playback is started or during playback. Further, instead of selecting the audio substance information that has been double-normally recorded when the headphone plug is inserted into the headphone jack 400, the user sets the priority by the setting operation using the input unit 98 shown in FIG. You may comprise. For example, when a high priority is set for reproduction of stereo recording, the user can listen to audio entity information recorded in stereo by headphones.
[0272]
(7.2) When building blocks by encoding method
If the encoding method is different, the sound cannot be heard if the playback apparatus does not support the encoding method of the audio information recorded on the disc (unless it has a corresponding decoder). In such a state, the user is confused. Accordingly, it is determined that LPCM audio information is recorded on all discs, and that all playback devices can play LPCM. Therefore, the user can reproduce only the audio information recorded in the LPCM on any audio DVD disc.
[0273]
On the other hand, various encoding methods are currently in practical use. Many of these are compression encoding systems, and have a feature that data can be used effectively, particularly when multi-channel recording is performed. As described above, when there is audio information recorded according to various encoding methods according to the purpose, it can be selected and reproduced only when the reproducing apparatus has a corresponding decoder. In this case, the playback apparatus indicates information indicating the coding method written in the item 285 of Audio coding mode in the ATS_PGCI_SRP 273 described above according to the temporary setting by the user, the initial setting by the user, and the setting by the playback apparatus. The optimum audio information is selected and reproduced according to the flowchart shown in FIG.
[0274]
Each setting process can be configured to be performed by the input unit 98 shown in FIG. Furthermore, the set information can be configured to be stored in a memory in the system controller 100.
[0275]
Further, when the DVD disk is set in the playback apparatus or when playback is started, the control information recorded on the DVD disk as described above is read by the system controller 100 and recorded on the DVD disk. The recording form, the reproduction form, or the encoding method of the audio entity information may be displayed on the display 99. With such a configuration, the user can appropriately know the settings that can be selected on the DVD disc, and can perform an appropriate selection operation.
[0276]
Hereinafter, an example of processing for selecting a PGC from information indicating an encoding method will be described with reference to the flowchart shown in FIG.
[0277]
First, when the selection process is started (step S1), ATS_PGCI_SRP 273 is read (step S2), and the coding method written in the item 285 of Audio coding mode described in ATS_PGCI_SRP 273 is read ( Step S3). Next, it is determined whether or not the playback device has the capability to perform playback using the read encoding method (step S4). As a result, if the playback device does not have the ability to perform playback using the read encoding method (step S4; No), the processing from reading ATS_PGCI_SRP 273 is repeated again (steps S2 to S2). On the other hand, if the playback device has the ability to perform playback using the read encoding method (step S4; Yes), it is determined whether or not the user has selected the read encoding method as a temporary setting. (Step S5). This setting is performed, for example, when playback is started or during playback by a remote control device or the like. For example, when a specific song is to be played back by an encoding method different from the existing setting. Done. As a result of the determination, if the user has selected the read encoding method as a temporary setting (step S5; Yes), the selection process ends, the PGC 300 indicated by the ATS_PGCI_SRP 273 is selected, and playback is performed. Start (step S8).
[0278]
However, if the user has not selected the read encoding method as a temporary setting (step S5; No), it is determined whether or not the user has selected the read encoding method as an initial setting. (Step S6). This initial setting is to perform the basic encoding method of the playback device in accordance with the user's own preference and the like. When this initial setting is performed, all the above settings are made unless the temporary setting described above is performed. The song will be played back by the encoding method that has been initially set. That is, when the user has selected the read encoding method as an initial setting (step S6; Yes), the selection process is terminated, the PGC 300 indicated by the ATS_PGCI_SRP 273 is selected, and reproduction is started (step S8). ).
[0279]
If the user has not selected the read encoding method as the initial setting (step S6; No), it is determined whether or not the read encoding method is selected as the setting of the playback device ( Step S7). This setting is performed in the manufacturing stage of the playback device. Unless the above-described various settings are performed by the user, all songs are played back according to the set encoding method. That is, if the read encoding method is selected as the setting of the playback device (step S7; Yes), the selection process is terminated, the PGC indicated by the ATS_PGCI_SRP 273 is selected, and playback is started (step S8). ).
[0280]
If the read encoding method is not selected as the setting of the playback apparatus due to an error in the read data (step S7; No), the process from reading ATS_PGCI_SRP273 is repeated again (step 2). .
[0281]
(7.2) When building blocks according to playback mode
The selection of the playback mode here means selecting whether to perform 2ch (stereo) playback or multi-channel playback. When the playback device supports multi-channel, audio information of multi-channel recording can be selected and played back. However, only when the user has a system (a plurality of amplifiers and speakers) capable of reproducing multi-channels and the reproduction apparatus is connected to the system, the original multi-channel reproduction can be performed. Therefore, also in this case, according to the temporary setting by the user, the initial setting by the user, and the setting by the playback device, the determination is made from the information indicating the number of channels described in the Audio channels item 284 described in the ATS_PGCI_SRP 273 described above. Then, the optimum audio information is selected and reproduced according to a flow similar to the flowchart shown above.
[0282]
(7.3) When building blocks according to the encoding method and playback format
As shown in the example of FIG. 12, both the encoding method and the reproduction form may be different as the difference in the type of audio information in the block. In such a case, the following processing is required.
[0283]
Priorities are set for all combinations of encoding methods and playback formats that can be processed by the playback apparatus. An example is shown in Table 2. Such a setting is made possible by each setting of a temporary setting by the user, an initial setting by the user, and a setting by the playback device as necessary.
[0284]
[Table 2]

In Table 2, the smaller the number in the table, the higher the priority.
[0285]
According to this priority setting, optimum audio information is selected and reproduced as shown in the flowchart of FIG. In the following, an example of processing for selecting and reproducing optimal audio information will be described with reference to the flowchart shown in FIG.
[0286]
First, when the selection process is started (step S10), ATS_PGCI_SRP 273 is acquired (step S11), and according to the block type, the encoding method described in the item 285 of Audio coding mode in ATS_PGCI_SRP 273, and Audio The reproduction form described in the channel item 284 is read (step S12). Next, it is determined whether or not the playback apparatus has the ability to perform playback by a combination of the read encoding method and playback mode (step S13). As a result, if the playback device does not have the capability to perform playback by a combination of the read encoding method and playback mode (step S13; No), the processing from reading ATS_PGCI_SRP273 is repeated again (steps S11 to S11). On the other hand, if the playback device has the capability to perform playback by the combination of the read encoding method and the playback device (step S13; Yes), the user temporarily executes the combination of the read encoding method and the playback device. It is determined whether or not a priority is set for selection as a general setting (step S14). When the priority is set (step S14; Yes), the priority is selected as a temporary setting by the user for the combination of the read encoding method and the reproduction device, and the priority number. (Step S15). Then, it is determined whether or not the set priority number is the smallest in the block (step S19). If it is the smallest (step S19; Yes), the selection process is terminated and the PGC 300 indicated by the ATS_PGCI_SRP 273 is selected. Then, reproduction is started (step S20).
[0287]
However, when the set priority number is not the smallest number in the block (step S19; No), the processing from acquisition of the next ATS_PGCI_SRP 273 of the block is repeated (steps S11 to S11). Then, as described above, for the combination of the next encoding method and reproduction mode, it is determined whether or not the reproduction apparatus has reproduction capability, and whether or not the priority is set as a temporary setting by the user. Determination is performed, and processing according to the determination result is performed (steps S13, 14, 15).
[0288]
On the other hand, when the priority order is not set as a temporary setting by the user for the combination of the next encoding method and reproduction mode (step S14; No), the priority order is set as the initial setting by the user for the combination. It is determined whether or not it has been performed (step S16). When the priority is set (step S16; Yes), the priority set as the initial setting by the user is set as the priority number for the combination of the read encoding method and the reproduction device (step S16). S17). Then, it is determined whether or not the set priority number is the smallest in the block (step S19). If it is the smallest (step S19; Yes), the selection process is terminated and the PGC 300 indicated by the ATS_PGCI_SRP 273 is selected. Then, reproduction is started (step S20).
[0289]
However, when the set priority number is not the smallest number in the block (step S19; No), the processing from acquisition of the next ATS_PGCI_SRP 273 of the block is repeated (steps S11 to S11). Then, as described above, for the combination of the next encoding method and reproduction mode, it is determined whether or not the reproduction apparatus has reproduction capability, and whether or not the priority is set as a temporary setting by the user. The determination and whether or not the priority order as the initial setting by the user is set are performed, and processing according to the determination result is performed (steps S13, 14, 15, 16, and 17).
[0290]
On the other hand, when the priority order is not set as the initial setting by the user for the combination of the next encoding method and playback mode (step S16; No), the priority order of the initial setting from the beginning of the playback device for the combination is set. Is set as a priority number (step S18). Then, it is determined whether or not the set priority number is the smallest in the block (step S19). If it is the smallest (step S19; Yes), the selection process is terminated and the PGC 300 indicated by the ATS_PGCI_SRP 273 is selected. Then, reproduction is started (step S20).
[0291]
As described above, when a priority order is set for a combination of an encoding method and a reproduction format, as a setting mode of the smallest number among the set priority orders, the PGC 300 based on the combination is used. Selection and reproduction by the combination are performed.
[0292]
As described above, priorities are determined for each combination of encoding schemes and playback modes, as needed, by temporary settings by the user, initial settings by the user, and settings by the playback device. Thus, even when a plurality of different types of audio information are recorded, it is possible for the user to select and reproduce the optimum audio information without having to select the type each time.
[0293]
In the example described with reference to FIG. 20 and FIG. 21, if designation is made that does not conform to the reproduction capability of the reproduction apparatus and no setting is selected, the display You may comprise so that warning display may be performed by display means, such as 99. FIG.
[0294]
【The invention's effect】
According to the information recording medium of claim 1, the sound information of the same content with different recording methods can be managed under the content and for each reproduction unit. Even if the sound information has the same contents but different, there is no need to designate each sound information, and the user is not confused.
[0295]
According to the information recording medium of the third aspect, when sound information is reproduced by a reproduction method corresponding to each recording method, the user is not discomforted and the user is confused. This can be prevented more reliably.
[0296]
According to the information recording medium of claim 4, based on the information indicating the recording method, the sound information of the same content of the desired recording method can be easily selected from the plurality of sound information of the same content different in the recording method. Will be. In addition, when a playback apparatus that attempts to play back the information recording medium cannot process the desired recording system, for example, a warning that the designation of the recording system by the user is invalid can be easily performed. Can do.
[0297]
According to the information recording medium of the fifth aspect, the appropriate reproduction of the sound information according to the user's request or according to the ability of the reproducing apparatus for reproducing the information recording medium does not cause confusion for the user. Will be done.
[0298]
According to the information recording medium of claim 7, the recording unit in which the desired sound information is recorded is searched, and only the desired sound information is reproduced from the sound information multiplexed in the searched recording unit. be able to. In particular, the inspection of the recording unit for a plurality of pieces of sound information having the same contents with different recording methods is performed based on a single first division unit indicated by a single first division information. Since the sound information of a plurality of second division units having the same content and different recording methods constitutes the same first division unit, information for selecting each sound information can be provided in the hierarchy of the first division information level. it can. Therefore, the sound information recorded in the DVD video format can be reproduced based on the control information corresponding to the DVD audio format.
[0299]
According to the information recording medium of the eighth aspect, it is possible to perform appropriate reproduction according to the use situation.
[0300]
According to the reproducing apparatus of the ninth aspect, the sound information of a predetermined recording method is reproduced only by the user specifying according to the content of the desired sound information. As described above, according to the present invention, sound information of the same content recorded in an information recording medium and having different recording methods can be appropriately reproduced without causing confusion to the user.
[0301]
According to the playback apparatus of the tenth aspect, the user can designate a desired playback method corresponding to the recording method, and can perform appropriate playback according to the user's request.
[0302]
According to the playback device of the eleventh aspect, a user request such as a change of the playback method can be reflected in the playback of the sound information in real time, and a more appropriate playback according to the user request is possible.
[0303]
According to the playback apparatus of the twelfth aspect, it is possible to store in advance a playback method suitable for the usage mode of the playback apparatus in response to a user request, and to provide an appropriate usage environment.
[0304]
According to the reproducing apparatus of the thirteenth aspect, the user can designate or rewrite an appropriate recording method according to the capability of the reproducing apparatus.
[0305]
According to the playback device of the fourteenth aspect, appropriate playback can be performed by a playback method suitable for the playback device without bothering the user.
[0306]
According to the reproducing apparatus of the fifteenth aspect, it is possible to prevent selection of a recording method that is not compatible with the reproducing apparatus. In addition, it is possible to perform appropriate reproduction reflecting the user's request to the maximum while selecting a recording method suitable for the reproduction apparatus.
[0307]
According to the playback device of the sixteenth aspect, it is possible to perform appropriate playback according to the use situation while eliminating the need for complicated operations by the user.
[Brief description of the drawings]
FIG. 1 is a diagram showing a physical structure (physical format) of a video DVD.
FIG. 2 is a diagram showing a logical structure (logical format) of a video DVD.
FIG. 3 is a diagram showing a physical structure (physical format) of an audio DVD.
FIG. 4 is a diagram showing a logical structure (logical format) of an audio DVD.
FIG. 5 is a diagram showing types of DVDs.
FIG. 6 shows an example of an audio / video DVD.
FIG. 7 is a diagram showing a concept of double management of the same object.
FIG. 8 is a diagram showing an example of navigation information defined for the audio / video DVD shown in FIG. 6;
FIG. 9 is a diagram illustrating information recorded in an ATS.
FIG. 10 is a diagram illustrating a relationship between user recognition, navigation information, and entity information during audio title playback.
FIG. 11 is a diagram illustrating a relationship between user recognition, navigation information, and entity information when playing a video / audio mixed title.
FIG. 12 is a diagram showing information recorded in the ATSI of a DVD disc recorded in an audio format.
FIG. 13 is a diagram showing information recorded in ATSI of a DVD disc recorded in an audio format and a video format.
FIG. 14 is a diagram showing a schematic configuration of a video DVD player.
FIG. 15 is a diagram showing a schematic configuration of an audio DVD player.
16 is a diagram showing a configuration of an audio decoder in the audio DVD player of FIG. 15. FIG.
FIG. 17A is a diagram showing a sound field formed when normal stereo music information is reproduced with headphones, and FIG. 17B is formed when binaural music information is reproduced with headphones. It is a figure which shows the sound field to be performed.
FIG. 18 is a conceptual diagram showing that audio packs recorded in two channels by the stereo method and audio packs recorded by two channels in the binaural method are multiplexed.
FIG. 19 is a diagram illustrating an example of a circuit configuration of a headphone jack.
FIG. 20 is a flowchart illustrating an example of processing for selecting a PGC from information indicating an encoding method.
FIG. 21 is a flowchart illustrating an example of processing for selecting a PGC from information obtained by combining an encoding method and a reproduction format.
[Explanation of symbols]
3 ... VMG
10 ... VOB
11 ... VTSI
202 ... AMG
204 ... SAPPT
210 ... AOB
211 ... ATSI
240 ... AMGI
242 ... ATT search pointer table
243 ... AOTT search pointer table
245 ... ATT search pointer
247 ... AOTT search pointer
251 ... TT search pointer table
254 ... TT search pointer
261 ... Title
300 ... PGC
301 ... Program

Claims (16)

An information recording medium having a sound information recording area in which a plurality of sound information is recorded, and a control information recording area in which control information necessary for reproducing the sound information recorded in the sound information recording area is recorded,
In the control information recorded in the control information recording area,
In order to divide a plurality of sound information recorded in the sound information recording area for each first division unit, first division information for identifying each first division unit;
In order to divide the sound information recorded in the sound information recording area into second division units as one reproduction unit, second division information for identifying each second division unit;
Management information relating the second segment unit and the first segment unit so that sound information of a plurality of second segment units constitutes the same first segment unit;
Search information for searching for second segment information of the plurality of second segments associated with the first segment information,
The plurality of second division unit sound information is recorded as sound information having the same content and different recording methods, and is associated with the first division information.
An information recording medium in which search information corresponding to is collectively recorded.  The information recording medium according to claim 1, wherein the management information is provided for each of the second division units.  The information recording medium according to claim 1, wherein the sound information of the plurality of second division units having the same contents and different recording methods has substantially the same reproduction time.  The information recording medium according to any one of claims 1 to 3, wherein the management information includes information indicating the recording method.  5. The information recording medium according to claim 1, wherein the recording system is any one of a recording form, a reproducing form, an encoding system, or a combination thereof. .  The information recording medium according to any one of claims 1 to 5, wherein the management information includes information indicating a number of the first division unit.  The information according to any one of claims 1 to 6, wherein the sound information having the same content with different recording methods is multiplexed and recorded at the same recording position in the sound information recording area. recoding media.  The information recording medium according to any one of claims 1 to 7, wherein the recording system is normal recording and binaural recording. An information recording medium having a sound information recording area in which a plurality of sound information is recorded, and a control information recording area in which control information necessary for reproducing the sound information recorded in the sound information recording area is recorded, The control information recorded in the control information recording area includes a first identification unit for identifying each first division unit in order to divide a plurality of sound information recorded in the sound information recording area for each first division unit. and sorting information, in order to distinguish every second segmental unit of sound information recorded in the sound information recording area as a unit of reproduction, and the second classification information identifying the second division units respectively, the first Search information for searching for second segment information of the plurality of second segments associated with one segment information, so that sound information of the plurality of second segment units constitutes the same first segment unit, Relation between the second division unit and the first division unit. Includes a management information attaching, the sound information of the plurality of second division units, are recorded as different audio information of recording a same content, A playback apparatus for playing back the sound information according to the control information from an information recording medium in which search information corresponding to the second section information of the plurality of second sections associated with the first section information is recorded together Because
Reading means for reading the recorded information recorded on the information recording medium;
An input means for inputting designation information for designating conditions to be reproduced;
Reading means for reading control information recorded on the information recording medium;
Selection means for selecting a recording method to be reproduced based on the designation information or setting information stored in the storage means;
Reproducing apparatus comprising: reproducing means for reproducing, based on the control information, sound information of a recording method selected by the selecting means from a plurality of pieces of sound information having the same contents with different recording methods. .  The management information includes information indicating the recording method, and extracts information indicating the recording method of each sound information recorded on the information recording medium from the control information, and displays the extracted information The reproducing apparatus according to claim 9, further comprising display means for recording method information.  The input means is set to accept input of the designation information regardless of the operating state of the playback device, and the selection means or the playback means can change the contents of the designation information input by the input means. The playback apparatus according to claim 9 or 10, wherein if there is, the playback apparatus is set to perform each process based on the changed designation information.  12. The reproducing apparatus according to claim 9, further comprising rewriting means for rewriting the contents of the setting information stored in the storage means.  10. The apparatus according to claim 9, further comprising warning display means for displaying a warning when the recording method selected by the selection means based on the designation information or the setting information cannot be processed by the playback apparatus. The playback device according to any one of claims 12 to 12.  14. The method according to claim 9, wherein the selection unit is set so as to select a recording method based on initial setting information stored in the storage unit in an initial setting state. A reproducing apparatus according to claim 1. 15. The reproducing apparatus according to claim 14, wherein a rewriting means for rewriting the contents of the setting information stored in the storage means and a recording method selected by the selecting means based on the designation information or the setting information If the device can not be processed, it has a warning display means for displaying a warning,
The selection unit further includes designation information input by the input unit, setting information rewritten by the rewriting unit, and finally the initial setting information unless the warning display is performed by the warning display unit. A playback apparatus that is set to select a recording method based on the respective information in the order of priority.  The recording methods are normal recording and binaural recording, and the playback device further includes detection means for detecting the insertion state of the headphone plug with respect to the headphone jack, and the playback means inserts the headphone plug into the headphone jack by the detection means. 16. The playback apparatus according to claim 9, wherein the playback apparatus is set to play back binaurally recorded sound information when it is detected.

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