JP3747711B2 - Information signal recording / reproducing apparatus and information signal recording / reproducing method - Google Patents

Description

より一般的には、シーク時間Ｔａｂ，Ｔｂａを光ディスク１３の最内周と最外周との間を移動するに要する同一の固定時間のＴとすると、
Ｙｍ＞２×Ｒｐ×（Ｒａ＋Ｒｂ）×Ｔ／（Ｒｐ−Ｒａ−Ｒｂ） …（１８式）
となる。
【００５８】
同様に、このＹｍの値は、リトライ処理やショックプルーフ・メモリとしての機能やそれ以外のシステム的な余裕を計算していないので、少なくともこの値以上の値を確保する必要がある。
【００５９】
従って、第１の情報信号Ａのためのトラック・バッファメモリ１９の第１の領域１９ａはＲｐ×Ｒａ×（Ｔａｂ＋Ｔｂａ）／（Ｒｐ−Ｒａ−Ｒｂ）以上確保しこの範囲でＥＭＰＴＹ値とＦＵＬＬ値を決定し、第２の情報信号Ｂのためのトラック・バッファメモリ１９の第２の領域１９ｂはＲｐ×Ｒｂ×（Ｔａｂ＋Ｔｂａ）／（Ｒｐ−Ｒａ−Ｒｂ）以上確保しこの範囲でＥＭＰＴＹ値とＦＵＬＬ値を決定する。
【００６０】
ここで、トラック・バッファメモリ１９は本実施例では図１の信号処理回路１８に接続されている６４Ｍｂのトラック・バッファメモリ１９であるが、当然この図１のＡＶ−ＥＮＤＥＣ２０に接続されている６４Ｍｂのバッファメモリ２１の一部を同様にトラック・バッファメモリとして使用してもかまわない。
【００６１】
つまり、トラック・バッファメモリ１９は光ディスク１３等の情報信号記録媒体に対する光ピックアップ１４による情報信号Ａ，Ｂへの転送レートＲｐと、映像等の圧縮伸張された情報信号Ａ，Ｂの転送レートＲａ，Ｒｂの差を吸収するものである。しかし、本実施例では特に図１の信号処理回路１８に接続されている６４Ｍｂのトラック・バッファメモリ１９を例として用いて、第１の情報信号Ａと第２の情報信号Ｂとが必要とする記録容量を、１つのトラック・バッファメモリ１９を分割して、かつ計算結果として余った領域をその比率で配分して使用することにより、それぞれのトラックバッファとしての余裕度を高めることが出来る。
【００６２】
例えば、第１の情報信号Ａの転送レートＲａを８Ｍｂｐｓとして、この第１の情報信号Ａに対してトラック・バッファメモリ１９の第１の領域１９ａの必要な記憶容量を３２Ｍｂとし、一方、第２の情報信号Ｂの転送レートＲｂを４Ｍｂｐｓとして、この第２の情報信号Ａに対してトラック・バッファメモリ１９の第２の領域１９ｂの必要な記憶容量を１６Ｍｂとすると、６４Ｍｂの余った領域である残りの１６Ｍｂを余らせておくのではなく、約１０Ｍｂ対５Ｍｂで２対１に分割して、トラック・バッファメモリ１９の第１の領域１９ａの記憶容量を３２Ｍｂ＋１０Ｍｂ＝４２Ｍｂとし、トラック・バッファメモリ１９の第２の領域１９ｂの記憶容量を１６Ｍｂ＋５Ｍｂ＝２１Ｍｂとすることにより、トラック・バッファメモリ１９を有効に使用することが出来る。これによって、２つの連続的な情報信号Ａ，Ｂを同時に処理出来る。
【００６３】
ここで光ディスク１３の場合には、前記した光ピックアップ１４によるシーク時間Ｔａｂ，Ｔｂｃの最大許容時間Ｔｍａｘ＝（Ｔａｂ・ｍａｘ），（Ｔｂｃ・ｍａｘ）が予め規格化されており、この最大許容時間（Ｔａｂ・ｍａｘ），（Ｔｂｃ・ｍａｘ）は共に同じ値で例えば記録型のＤＶＤ用の光ディスク１３では１．５秒に設定されている。従って、上記した条件を先に説明した（９式）に当てはめると、

となるものである。
【００６４】
次に、一つの光ピックアップ１４により２つの情報信号Ａ，Ｂを光ディスク１３に時分割で記録する場合には、光ディスク１３上の第１，第２の領域内の各空き領域を知る必要があり、又は２つの情報信号Ａ，Ｂのうち一方を光ディスク１３から時分割で再生し他方を光ディスク１３に時分割で記録する場合にも空き領域を知る必要がある。
【００６５】
そこで、ここでは、光ディスク１３上の管理領域１３ｃ内に記録されているデータ領域の開始アドレスと終了アドレスの間隔から、空き領域の開始アドレスと終了アドレスを特定し、独立した空き領域の容量を計算し、この空き領域の容量と空き領域の位置情報とを共に記憶し、これを繰り返して全ての空き領域に対して同様に計算して記憶する。
【００６６】
この際、記録すべき情報信号の転送レートを例えば２，４，８Ｍｂｐｓの３種類の場合において、それぞれの独立した空き領域の容量が連続記録または連続記録再生が可能かを計算によって求めている。
【００６７】
また、一つの光ピックアップ１４のシーク時間については、光ディスク１３の回転がＣＬＶ制御なので、アドレス間のアドレス差を計算し、システムコントローラ２２内のプログラムＲＯＭに記憶されているシークテーブルを参照することにより、アドレス差に基づいたトラック移動本数を求める。これに所定の係数演算をすることによって、光ピックアップ１４のシーク時間を計算する。または、光ピックアップ１４のシーク時間につていは、その装置によって所定の一定値として設定しても良いし、規格で決められた最大許容シーク時間として設定しても良い。
【００６８】
ここで、本発明における光ディスク１３上の第１，第２の領域１３ａ，１３ｂ内の空き領域に記録すべき情報信号が記録可能か否かを説明する前段階として、一般的な光ディスクの記録再生方法の場合、転送レートＲａで一つのトラック・バッファメモリに入力した一つの情報信号Ａを一つの光ピックアップにより転送レートＲａより速い転送レートＲｐで光ディスクに記録する時に、空き領域に記録すべき情報信号の連続性を維持するには、前記した（９式）又は（１９式）において、情報信号Ｂに関する部分をゼロにして、
Ｙａ≧Ｒｐ×Ｒａ×（Ｔａｂ＋Ｔｂａ）／（Ｒｐ−Ｒａ） …（２１式）
又は
Ｙａ≧２×Ｒｐ×Ｒａ×Ｔｍａｘ／（Ｒｐ−Ｒａ） …（２２式）
を満足すればよい。
【００６９】
つまり、一つの光ピックアップによる転送レートと、一つのトラック・バッファメモリに入力する一つの情報信号の転送レートの差に相当する容量より、シーク時間の間で一つの情報信号の転送レートの容量が越えてはいけない。このシーク時間の要求値は変数である入力した一つの情報信号の転送レートによって変化する。従って、実際に記録する時に一つの情報信号の転送レートによって、記録可能領域が大きく変動することになる。
【００７０】
なお、ここで記した（２１式）又は（２２式）式は、ソフトウェアやハードウェアで作成する際に、適宜簡略化してもかまわないし、例えばシステムコントローラ内のプログラムＲＯＭの中に計算結果をテーブル化して保持していてこれを参照して、結果を得てもかまわない。
【００７１】
そして、システムコントローラは、上記の結果として、トータルの空き領域の容量とか、トータルのそれぞれの転送レートでの記録可能な領域に対応する記録時間（または容量）とか、トータルの空き領域内の容量に対する記録可能な空き領域内の容量の比率を計算して記録可能な効率などをディスプレイに例えば図４に示した如く表示してユーザーに知らせている。
【００７２】
一方、本発明では、トラック・バッファメモリ１９内の第１の領域１９ａに第１の転送レートＲａで入力した第１の情報信号Ａと、トラック・バッファメモリ１９内の第２の領域１９ｂに第２の転送レートＲｂで入力した第２の情報信号Ｂとを一つの光ピックアップ１４で第１，第２の転送レートＲａ，Ｒｂより速い転送レートＲｐで光ディスク１３上の第１，第２の領域１３ａ，１３ｂ内の各空き領域に時分割で記録する際に、一つの光ピックアップ１４で光ディスク１３上の管理領域１３ｃに記録した第１，第２の領域１３ａ，１３ｂのアドレスを再生して、第１，第２の情報信号Ａ，Ｂをそれぞれ記録する光ディスク１３上の第１，第２の領域１３ａ，１３ｂ内の各空き領域を検索し、記録時に一つの光ピックアップ１４とトラック・バッファメモリ１９内の第１，第２の領域１９ａ，１９ｂとの間で時分割記録時の連続性を保った状態で第１，第２の情報信号Ａ，Ｂを光ディスク１３上の第１，第２の領域１３ａ，１３ｂ内の各空き領域に記録可能か否かをシステムコントローラ２２が判断している。
【００７３】
また、本発明では、第１，第２の情報信号Ａ，Ｂのうちいずれか一方の情報信号Ａ（又はＢ）を光ディスク１３の一方の領域１３ａ（又は１３ｂ）から再生する動作と、他方の情報信号Ｂ（又はＡ）を光ディスク１３の他方の領域１３ｂ（又は１３ａ）に記録する動作とを一つの光ピックアップ１４で時分割して記録再生する際に、一つの光ピックアップ１４で光ディスク１３上の管理領域１３ｃに記録した第１，第２の領域１３ａ，１３ｂのアドレスを再生して、他方の情報信号Ｂ（又はＡ）を記録する光ディスク１３Ｂ上の他方の領域１３ｂ（又は１３ａ）内の空き領域を検索し、記録再生時に一つの光ピックアップ１４とトラック・バッファメモリ１９内の第１，第２の領域１９ａ，１９ｂとの間で時分割記録再生時の連続性を保った状態で他方の情報信号Ｂ（又はＡ）を光ディスク１３上の第２の領域１３ｂ（又は第１の領域１３ａ）内の空き領域に記録可能か否かをシステムコントローラ２２が判断している。
【００７４】
そして、上記した第１，第２の情報信号Ａ，Ｂの記録動作、又は、第１，第２の情報信号Ａ，Ｂの記録再生動作のいずれの場合でも、一つの光ピックアップ１４とトラック・バッファメモリ１９内の第１，第２の領域１９ａ，１９ｂとの間で時分割時の連続性を保っためには、前記した（９式）又は（１９式）を満足しているか否かをシステムコントローラ２２が判断した上で、空き領域に記録すべき情報信号を記録している。
【００７５】
尚、前記した（９式）又は（１９式）の計算式は記録又は記録再生の都度、システムコントローラ２２にて計算してもよいが、システムコントローラ２２内のプログラムＲＯＭに計算結果を予めテーブル化しておき、このテーブルを参照することにより結果を得るようにしても良い。
【００７６】
この際、前記した（９式）又は（１９式）において、例えば、光ピックアップ１４による第１，第２の情報信号Ａ，Ｂの転送レートＲｐ＝２５Ｍｂｐｓに対して、トラック・バッファメモリ１９内の第１，第２の領域１９ａ，１９ｂに時分割で入出力する第１，第２の情報信号Ａ，Ｂの転送レートＲａ，Ｒｂの和がこれを越えてしまう場合は、２つの情報信号Ａ，Ｂの記録又は記録再生が不可能であるから、これもユーザーに知らせる。この場合、例えば、Ｒａ＝８Ｍｂｐｓの時、Ｒｂ＝１７Ｍｂｐｓとなり、前記した（９式）又は（１９式）を満足しないので、記録不可能又は記録再生不可能を例えば図５（Ａ），（Ｂ）に示した如く表示している。
【００７７】
ここでも、システムコントローラ２２は、上記の結果として、トータルの空き領域の容量とか、トータルのそれぞれの転送レートでの記録可能な領域に対応する記録時間（または容量）とか、トータルの空き領域内の容量に対する記録可能な空き領域内の容量の比率を計算した記録可能な効率などをディスプレイ２５に例えば図５（Ａ），（Ｂ）に示した如く表示してユーザーに知らせている。
【００７８】
図５（Ａ），（Ｂ）に示した表示例では、例えば転送レート８Ｍｂｐｓの一方の情報信号を時分割で記録又は再生し、他方の情報信号を時分割で記録した場合の、記録時間，実効空き容量，記録可能な効率を示した。この表示方法は、全ての転送レートの情報信号を記録又は記録再生する場合の計算結果を示してもかまわない。しかしがら、図４に示したような１つの情報信号を記録する場合に対して、図５（Ａ），（Ｂ）に示したような２つの情報信号を記録又は記録再生する場合には空き領域の記録時の効率が落ちる可能性があるので、ユーザーにこれを知らせる方が望ましい。また、上記した表示例では、記録時間や空き容量を同時に示したが、空き容量は表示しなくても良い。また、転送レートの値を直接表示することなく、先に説明したように転送レートの値を高画質用，やや高画質用，普通画質用などと表示しても良く、あるいは、記録時間２時間のモード，記録時間４時間のモード，記録時間８時間のモードなどと表示しても良い。
【００７９】
この関係を記録可能な効率として、ユーザーに知らせることにより、より効率よくユーザーが転送レートを設定できることになる。
【００８０】
そして、ユーザーは、この表示情報から、それぞれの転送レートでの無駄領域なり記録可能時間がわかるから、記録したい映像や音声情報と、空き容量と無駄領域に合わせて、ユーザーがキーやリモコンを用いて転送レートを入力しどれかを選択する。転送レートを設定しない場合は、自動的に最大の転送レート等の所定値としても良い。
【００８１】
＜２つの情報信号を時分割で記録する場合＞
図６は第１，第２の情報信号を光ディスクに時分割で記録する形態を模式的に示した図、
図７は第１，第２の情報信号を光ディスクに時分割で記録する状態を示したフローチャート、
図８は第１，第２の情報信号を光ディスクに時分割で記録する状態を示したタイミングチャートである。
【００８２】
図６に示した如く、第１，第２の転送レートＲａ，Ｒｂでトラック・バッファメモリ１９の第１，第２の領域１９ａ，１９ｂにそれぞれ入力した第１，第２の情報信号Ａ，Ｂを、光ピックアップ１４により第１，第２の転送レートＲａ，Ｒｂより速い一定の転送レートで光ディスク１３上の第１，第２の領域１３ａ，１３ｂに時分割で記録動作を行うものである。
【００８３】
即ち、光ディスク１３は記録再生可能に形成されており、この光ディスク１３上には記録容量Ｙａを有する第１の情報信号Ａを記録するための第１の領域１３ａと、記録容量Ｙｂを有する第２の情報信号Ｂを記録するための第２の領域１３ｂとが予め用意されていると共に、光ディスク１３上には第１，第２の領域１３ａ，１３ｂの開始アドレス，終了アドレスを記録した管理領域１３ｃが設けられている。
【００８４】
また、光ディスク１３の記録時に、ＡＶ−ＥＮＤＥＣ２０内のＭＰＥＧエンコーダは、第１，第２の情報信号Ａ，Ｂの転送レートＲａ，Ｒｂをユーザーが指定する記録モード（高画質用の転送レート８Ｍｂｐｓ，やや高画質用の転送レート４Ｍｂｐｓ，普通画質用の転送レート２Ｍｂｐｓ）により設定可能になっており、記録すべき第１，第２の情報信号Ａ，ＢをＡＶ−ＥＮＤＥＣ２０から信号処理回路２０（図１）に接続した６４Ｍｂのトラック・バッファメモリ１９の第１，第２の領域１９ａ，１９ｂに一時的に記憶させ、この時は光ピックアップ１４は待機状態として所定の記録すべき光ディスク１３上のトラックでキック待ちの状態としている。そして、トラック・バッファメモリ１９の各領域１９ａ，１９ｂ内の残量の制御を行いながら、トラック・バッファメモリ１９の各領域１９ａ，１９ｂの容量がＦＵＬＬ値になったら、光ディスク１３への記録時にエラー訂正コード、アドレスやシンク信号を加えて訂正単位のトラック・バッファメモリ１９の第１の領域１９ａに記憶した第１の情報信号Ａと、トラック・バッファメモリ１９の第２の領域１９ｂに記憶した第２の情報信号Ｂとを時分割で交互に読み出して、光ピックアップ１４により転送レートＲａ，Ｒｂより速い一定の転送レートＲｐで読み出した第１の情報信号Ａを光ディスク１３上の第１の領域１３ａに、第２の情報信号Ｂを光ディスク１３上の第２の領域１３ｂに時分割でそれぞれ交互に記録している。これを繰り返して、連続的な記録を行っている。
【００８５】
ここで、図７及び図８を用いて２つの情報信号Ａ，Ｂを時分割で記録する動作について説明する。尚、図８では、第１，第２の情報信号Ａ，Ｂの転送レートＲａ，Ｒｂは図示の都合上同一の転送レートで図示しているが、両者が異なる場合でも同じ傾向を示すものである。
【００８６】
まず、ステップＳ５１では、記録のフローを開始する。
【００８７】
次に、ステップＳ５２では、光ピックアップ１４が光ディスク１３上の管理領域１３ｃを再生する。
【００８８】
次に、ステップＳ５３では、光ピックアップ１４が光ディスク１３上の管理領域１３ｃを再生した時に、光ディスク１３上の第１，第２の領域内の各空き領域を管理領域１３ｃからのアドレス情報によって検索する。そして、光ディスク１３上の第１，第２の領域内の各空き領域を検索した後に、システムコントローラ２２は、光ディスク１３上の第１，第２の領域内の各空き領域に第１，第２の情報信号Ａ，Ｂを時分割で記録可能か否かを先に説明した（９式）又は（１９式）によって判断し、この結果を先に図５（Ａ）で説明したようにディスプレイ２５（図１）に表示すると共に、記録可能な場合には次のステップＳ５４に進む。
【００８９】
次に、ステップＳ５４では、光ピックアップ１４が光ディスク１３上で記録したい場所となる第１の領域１３ａ中で１番目のアドレス領域Ａ１（目的位置）に至ったか否かを確認する。ここで、アドレス領域Ａ１（目的位置）に至っていない場合はこのステップＳ５４を更に続行し、アドレス領域Ａ１（目的位置）に至った場合は次のステップＳ５５に進む。
【００９０】
次に、ステップＳ５５では、ＡＶ−ＥＮＤＥＣ２０側から転送レートＲａで送られた第１の情報信号Ａをトラック・バッファメモリ１９の第１の領域１９ａに一時的に記憶させる。この際、システムコントローラ２２（図１）は、トラック・バッファメモリ１９内の第１の領域１９ａのＥＭＰＴＹ値とＦＵＬＬ値とを常に監視しており、第１の情報信号ＡがＦＵＬＬ値に至るまで転送レートＲａで記憶される。
【００９１】
次に、ステップＳ５６では、トラック・バッファメモリ１９内の第１の領域１９ａに記憶した第１の情報信号ＡがＦＵＬＬ値に至ったか否かを問い、ＦＵＬＬ値に至っていない場合にはステップＳ５５に戻り、一方、ＦＵＬＬ値に至った場合には次のステップＳ５７に進む。
【００９２】
次に、ステップＳ５７では、第１の情報信号ＡがＦＵＬＬ値になったら第１の情報信号Ａが一定の転送レートＲｐで光ピックアップ１４側に読み出されるので、図８に示したようにＦＵＬＬ値とＥＭＰＴＹ値との間では第１の情報信号Ａが差分（Ｒｐ−Ｒａ）の傾斜で減少しながら第１の情報信号Ａが光ピックアップ１４によって一定の転送レートＲｐで光ディスク１３上の第１の領域１３ａに記録される。
【００９３】
次に、ステップＳ５８では、トラック・バッファメモリ１９内の第１の領域１９ａに記憶された第１の情報信号ＡがＥＭＰＴＹ値に至ったか否かを問い、ＥＭＰＴＹ値に至っていない場合にはステップＳ５７に戻り、一方、ＥＭＰＴＹ値に至った場合には次のステップＳ５９に進む。
【００９４】
次に、ステップＳ５９では、トラック・バッファメモリ１９内の第１の領域１９ａに記憶された第１の情報信号ＡがＥＭＰＴＹ値に至ったので、光ピックアップ１４は光ディスク１３上の第１の領域１３ａ中で１番目のアドレス領域Ａ１での記録を中止する。ここで、第１の情報信号Ａの記録が中止された段階から、トラック・バッファメモリ１９内の第１の領域１９ａに第１の情報信号ＡがＡＶ−ＥＮＤＥＣ２０側から転送レートＲａで引き続き送られるが、この書き込み動作は図８から明らかなようにＦＵＬＬ値に至るまでの期間が第１の領域１３ａ中で２番目のアドレス領域Ａ２を記録開始する前までに終了すれば良い。
【００９５】
次に、ステップＳ６０では、光ピックアップ１４が次に第２の情報信号Ｂを記録するために光ディスク１３上の第２の領域１３ｂ中で１番目のアドレス領域Ｂ１に移動する。この際、光ピックアップ１４が光ディスク１３上の第１の領域１３ａ中で１番目のアドレス領域Ａ１から第２の領域１３ｂ中で１番目のアドレス領域Ｂ１に移動するシーク時間Ｔａｂは最大で１．５秒以内である。
【００９６】
次に、ステップＳ６１では、光ピックアップ１４が光ディスク１３上の第２の領域１３ｂのアドレス領域Ｂ１（目的位置）に至ったか否かを確認する。ここで、アドレス領域Ｂ１（目的位置）に至っていない場合はこのステップＳ６１を更に続行し、アドレス領域Ｂ１（目的位置）に至った場合は次のステップＳ６２に進む。
【００９７】
次に、ステップＳ６２では、ＡＶ−ＥＮＤＥＣ２０側から転送レートＲｂで送られた第２の情報信号Ｂがトラック・バッファメモリ１９の第２の領域１９ｂにＦＵＬＬ値に至るまで転送レートＲｂで一時的に記憶される。
【００９８】
次に、ステップＳ６３では、トラック・バッファメモリ１９内の第２の領域１９ｂに記憶した第２の情報信号ＢがＦＵＬＬ値に至ったか否かを問い、ＦＵＬＬ値に至っていない場合にはステップＳ６２に戻り、一方、ＦＵＬＬ値に至った場合には次のステップＳ６４に進む。
【００９９】
次に、ステップＳ６４では、第２の情報信号ＢがＦＵＬＬ値になったら第２の情報信号Ｂが一定の転送レートＲｐで光ピックアップ１４側に読み出されるので、図８に示したようにＦＵＬＬ値とＥＭＰＴＹ値との間では第２の情報信号Ｂが差分（Ｒｐ−Ｒｂ）の傾斜で減少しながら第２の情報信号Ｂが光ピックアップ１４によって一定の転送レートＲｐで光ディスク１３上の第２の領域１３ｂに記録される。
【０１００】
次に、ステップＳ６５では、トラック・バッファメモリ１９内の第２の領域１９ｂに記憶された第２の情報信号ＢがＥＭＰＴＹ値に至ったか否かを問い、ＥＭＰＴＹ値に至っていない場合にはステップＳ６４に戻り、一方、ＥＭＰＴＹ値に至った場合には次のステップＳ６６に進む。
【０１０１】
次に、ステップＳ６６では、トラック・バッファメモリ１９内の第２の領域１９ｂに記憶された第２の情報信号ＢがＥＭＰＴＹ値に至ったので、光ピックアップ１４は光ディスク１３上の第２の領域１３ｂのアドレス領域Ｂ１での記録を中止する。ここで、第２の情報信号Ｂの記録が中止された段階から、トラック・バッファメモリ１９内の第２の領域１９ｂに第２の情報信号ＢがＡＶ−ＥＮＤＥＣ２０側から引き続き送られるが、この書き込み動作は図８から明らかなようにＦＵＬＬ値に至るまでの期間が第２の領域１３ｂ中で２番目のアドレス領域Ｂ２を記録開始する前までに終了すれば良い。
【０１０２】
次に、ステップＳ６７では、光ピックアップ１４が次に第１の情報信号Ａを記録するために光ディスク１３上の第１の領域１３ａ中で２番目のアドレス領域Ａ２に移動する。この際、光ピックアップ１４が光ディスク１３上の第２の領域１３ｂ中で１番目のアドレス領域Ｂ１から第１の領域１３ａ中で２番目のアドレス領域Ａ２に移動するシーク時間Ｔｂａは最大で１．５秒以内である。
【０１０３】
そして、光ピックアップ１４が光ディスク１３上の第１の領域１３ａ中で２番目の領域Ａ２に至ったらステップＳ５４に戻り以下同様に繰り返せば、光ピックアップ１４によって第１，第２の情報信号Ａ，Ｂをアドレス領域Ａ１，Ｂ１，Ａ２，Ｂ２，Ａ３，Ｂ３，……の順に時分割で交互に連続して記録できる。この際、光ディスク１３上の第１，第２の領域１３ａ，１３ｂ内の空き領域に記録した第１，第２の情報信号Ａ，Ｂのアドレス情報を記録終了後に管理領域１３ｃに記録している。
【０１０４】
尚、光ピックアップ１４による記録を全部中止するフローは、ステップ５９の後、又は、ステップ６６の後で問い合わせれば良いが動作が複雑になるので、ここでは省略している。
【０１０５】
また、上記した２つの情報信号Ａ，Ｂの時分割記録のフローにおいて、トラック・バッファメモリ１９は最初の１回目のサイクルで空状態からＦＵＬＬ値に至るが、２回目以降のサイクルではＥＭＰＴＹ値とＦＵＬＬ値の間で記録容量Ｙａを有する第１の情報信号Ａと記録容量Ｙｂを有する第２の情報信号Ｂを記憶することになる。
【０１０６】
上記した２つの情報信号Ａ，Ｂの時分割記録のフローでは、一つの光ピックアップ１４を介して光ディスク１３とトラック・バッファメモリ１９との間で時分割記録時の連続性を保っために、先に説明した（９式）又は（１９式）を満たすものであり、ここでの詳述を省略する。
【０１０７】
＜２つの情報信号を時分割で記録再生する場合＞
図９は第１，第２の情報信号を光ディスクに時分割で記録再生する形態を模式的に示した図、
図１０は第１，第２の情報信号を光ディスクに時分割で記録再生する状態を示したフローチャート、
図１１は第１，第２の情報信号を光ディスクに時分割で記録再生する状態を示したタイミングチャートである。
【０１０８】
図９に示した如く、第１，第２の転送レートＲａ，Ｒｂを有する第１，第２の情報信号Ａ，Ｂのうちでいずれか一方の情報信号Ａ（Ｂ）を光ディスク１３上の一方の領域１３ａ（１３ｂ）から光ピックアップ１４により時分割で再生して第１，第２の転送レートＲａ，Ｒｂより速い一定の転送レートＲｐでトラック・バッファメモリ１９の一方の領域１９ａ，（１９ｂ）に記憶させ、他方の情報信号Ｂ（Ａ）をトラック・バッファメモリ１９の他方の領域１９ｂ，（１９ａ）から光ピックアップ１４により一定の転送レートＲｐで読み出して光ディスク１３上の他方の領域１３ｂ（１３ａ）に時分割で記録している。
【０１０９】
ここで、図１０及び図１１を用いて２つの情報信号Ａ，Ｂを時分割で記録再生する動作について説明する。尚、図１０では、第１，第２の情報信号Ａ，Ｂの転送レートＲａ，Ｒｂは図示の都合上同一の転送レートで図示しているが、両者が異なる場合でも同じ傾向を示すものである。
【０１１０】
まず、ステップＳ７１では、記録再生のフローを開始する。
【０１１１】
次に、ステップＳ７２では、光ピックアップ１４が光ディスク１３上の管理領域１３ｃを再生する。
【０１１２】
次に、ステップＳ７３では、光ピックアップ１４が光ディスク１３上の管理領域１３ｃを再生した時に、この管理領域１３ｃから第１の領域に予め記録されている第１の情報信号Ａに関する再生情報と位置情報とを取得すると共に、第２の領域内の空き領域を管理領域１３ｃからのアドレス情報によって検索する。そして、光ディスク１３上の第２の領域内の空き領域を検索した後に、システムコントローラ２２は、光ディスク１３上の第２の領域内の空き領域に第２の情報信号Ｂを時分割で記録可能か否かを先に説明した（９式）又は（１９式）によって判断し、この結果を先に図５（Ｂ）で説明したようにディスプレイ２５に表示すると共に、記録可能な場合に次のステップＳ７４に進む。
【０１１３】
次に、ステップＳ７４では、光ピックアップ１４が光ディスク１３上で再生したい場所となる第１の領域１３ａ中で１番目のアドレス領域Ａ１（目的位置）に至ったか否かを確認する。ここで、アドレス領域Ａ１（目的位置）に至っていない場合はこのステップＳ７４を更に続行し、アドレス領域Ａ１（目的位置）に至った場合は次のステップＳ７５に進む。
【０１１４】
次に、ステップＳ７５では、光ピックアップ１４が第１の領域１３ａ中で１番目のアドレス領域Ａ１から再生を開始して第１の情報信号Ａを転送レートＲｐでトラック・バッファメモリ１９内の第１の領域１９ａに一時的に記憶させる。この際、システムコントローラ２２（図１）は、トラック・バッファメモリ１９内の第１の領域１９ａのＥＭＰＴＹ値とＦＵＬＬ値とを常に監視しており、最初の１回目のサイクルだけ第１の情報信号ＡがＥＭＰＴＹ値に至るまで転送レートＲｐで記憶される。
【０１１５】
次に、ステップＳ７６では、トラック・バッファメモリ１９内の第１の領域１９ａに記憶した第１の情報信号ＡがＥＭＰＴＹ値に至ったか否かを問い、ＥＭＰＴＹ値に至っていない場合にはステップＳ７５に戻り、一方、ＥＭＰＴＹ値に至った場合には次のステップＳ７７に進む。
【０１１６】
次に、ステップＳ７７では、第１の情報信号ＡがＥＭＰＴＹ値を越えたら第１の情報信号Ａが転送レートＲａでＡＶ−ＥＮＤＥＣ２０（図１）側に読み出されるので、図１１に示したようにＥＭＰＴＹ値とＦＵＬＬ値との間では第１の情報信号Ａがトラック・バッファメモリ１９の第１の領域１９ａに書き込まれる転送レートＲｐと、第１の情報信号Ａが第１の領域１９ａからＡＶ−ＥＮＤＥＣ２０側に読み出される転送レートＲａの差分（Ｒｐ−Ｒａ）の傾斜で増加しながら第１の情報信号Ａが第１の領域１９ａに一時的に記憶される。
【０１１７】
次に、ステップＳ７８では、トラック・バッファメモリ１９内の第１の領域１９ａに記憶された第１の情報信号ＡがＦＵＬＬ値に至ったか否かを問い、ＦＵＬＬ値に至っていない場合にはステップＳ７７に戻り、一方、ＦＵＬＬ値に至った場合には次のステップＳ７９に進む。
【０１１８】
次に、ステップＳ７９では、トラック・バッファメモリ１９内の第１の領域１９ａに記憶された第１の情報信号ＡがＦＵＬＬ値に至ったので、光ピックアップ１４は光ディスク１３上の第１の領域１３ａ中で１番目のアドレス領域Ａ１での再生を中止する。ここで、第１の情報信号Ａの再生が中止された段階から、トラック・バッファメモリ１９内の第１の領域１９ａに記憶された第１の情報信号ＡがＡＶ−ＥＮＤＥＣ２０側に転送レートＲａで引き続き読み出されるが、この読み出し動作は図１１から明らかなようにＥＭＰＴＹ値に至るまでの期間が第１の領域１３ａ中で２番目のアドレス領域Ａ２を再生開始する前までに終了すれば良い。
【０１１９】
次に、ステップＳ８０では、光ピックアップ１４が次に第２の情報信号Ｂを記録するために光ディスク１３上の第２の領域１３ｂ中で１番目のアドレス領域Ｂ１に移動する。この際、光ピックアップ１４が光ディスク１３上の第１の領域１３ａ中で１番目のアドレス領域Ａ１から第２の領域１３ｂ中で１番目のアドレス領域Ｂ１に移動するシーク時間Ｔａｂは最大で１．５秒以内である。
【０１２０】
次に、ステップＳ８１では、光ピックアップ１４が光ディスク１３上の第２の領域１３ｂのアドレス領域Ｂ１（目的位置）に至ったか否かを確認する。ここで、アドレス領域Ｂ１（目的位置）に至っていない場合はこのステップＳ８１を更に続行し、アドレス領域Ｂ１（目的位置）に至った場合は次のステップＳ８２に進む。
【０１２１】
次に、ステップＳ８２では、ＡＶ−ＥＮＤＥＣ２０側から転送レートＲｂで送られた第２の情報信号Ｂがトラック・バッファメモリ１９の第２の領域１９ｂにＦＵＬＬ値に至るまで転送レートＲｂで一時的に記憶される。
【０１２２】
次に、ステップＳ８３では、トラック・バッファメモリ１９内の第２の領域１９ｂに記憶した第２の情報信号ＢがＦＵＬＬ値に至ったか否かを問い、ＦＵＬＬ値に至っていない場合にはステップＳ８２に戻り、一方、ＦＵＬＬ値に至った場合には次のステップＳ８４に進む。
【０１２３】
次に、ステップＳ８４では、第２の情報信号ＢがＦＵＬＬ値になったら第２の情報信号Ｂが一定の転送レートＲｐで光ピックアップ１４側に読み出されるので、図１１に示したようにＦＵＬＬ値とＥＭＰＴＹ値との間では第２の情報信号Ｂが差分（Ｒｐ−Ｒｂ）の傾斜で減少しながら第２の情報信号Ｂが光ピックアップ１４によって一定の転送レートＲｐで光ディスク１３上の第２の領域１３ｂに記録される。
【０１２４】
次に、ステップＳ８５では、トラック・バッファメモリ１９内の第２の領域１９ｂに記憶された第２の情報信号ＢがＥＭＰＴＹ値に至ったか否かを問い、ＥＭＰＴＹ値に至っていない場合にはステップＳ８４に戻り、一方、ＥＭＰＴＹ値に至った場合には次のステップＳ８６に進む。
【０１２５】
次に、ステップＳ８６では、トラック・バッファメモリ１９内の第２の領域１９ｂに記憶された第２の情報信号ＢがＥＭＰＴＹ値に至ったので、光ピックアップ１４は光ディスク１３上の第２の領域１３ｂのアドレス領域Ｂ１での記録を中止する。ここで、第２の情報信号Ｂの記録が中止された段階から、トラック・バッファメモリ１９内の第２の領域１９ｂに第２の情報信号ＢがＡＶ−ＥＮＤＥＣ２０側から引き続き送られるが、この書き込み動作は図１１から明らかなようにＦＵＬＬ値に至るまでの期間が第２の領域１３ｂ中で２番目のアドレス領域Ｂ２を記録開始する前までに終了すれば良い。
【０１２６】
次に、ステップＳ８７では、光ピックアップ１４が次に第１の情報信号Ａを再生するために光ディスク１３上の第１の領域１３ａ中で２番目のアドレス領域Ａ２に移動する。この際、光ピックアップ１４が光ディスク１３上の第２の領域１３ｂ中で１番目のアドレス領域Ｂ１から第１の領域１３ａ中で２番目のアドレス領域Ａ２に移動するシーク時間Ｔｂａは最大で１．５秒以内である。
【０１２７】
そして、光ピックアップ１４が光ディスク１３上の第１の領域１３ａ中で２番目の領域Ａ２に至ったらステップＳ７４に戻り以下同様に繰り返せば、光ピックアップ１４によって第１，第２の情報信号Ａ，Ｂをアドレス領域Ａ１，Ｂ１，Ａ２，Ｂ２，Ａ３，Ｂ３，……の順に時分割で交互に連続して記録再生できる。この際、光ディスク１３上の第２の領域１３ｂ内の空き領域に記録した第２の情報信号Ｂのアドレス情報を記録終了後に管理領域１３ｃに記録している。
【０１２８】
尚、光ピックアップ１４による記録再生を全部中止するフローは、ステップ７９の後、又は、ステップ８６の後で問い合わせれば良いが動作が複雑になるので、ここでは省略している。
【０１２９】
また、上記した２つの情報信号の時分割記録再生のフローにおいて、トラック・バッファメモリ１９の第２の領域１９ｂは最初の１回目のサイクルで空状態からＦＵＬＬ値に至るが、２回目以降のサイクルではＥＭＰＴＹ値とＦＵＬＬ値の間で記録容量Ｙｂを有する第２の情報信号Ｂを記憶することになる。
【０１３０】
上記した２つの情報信号Ａ，Ｂの時分割記録再生のフローでは、一つの光ピックアップ１４を介して光ディスク１３とトラック・バッファメモリ１９との間で時分割記録再生時の連続性を保っために、先に説明した（９式）又は（１９式）を満たすものであり、ここでの詳述を省略する。
【０１３１】
尚、本実施例では、光ディスク１３を中心に説明しているが、例えば磁気ディスク装置のように複数のディスクと複数のヘッドを持ちこれを交互に切り換えながら、記録再生を行う装置にも適用でき、また、ディスクは螺旋状の連続的なトラックを想定しているが、同様に磁気ディスク装置のように複数の同心円状のトラックからなる場合も適用出来る。この場合は、連続的な記録再生においてトラックのキック動作が入るが、この動作もシーク時間として考えれば同様に適応可能である。また、記録再生の手順や、表示の内容ついては一実施例に過ぎずこの範囲に限定されるものではない。
【０１３２】
また、ここで情報信号の転送レートとは、ビデオやオーディオ等の連続的な情報信号を中心に説明しているが、所定の時間の中で処理されなければ意味をなさないコンピュータデータ等は、連続的なデータに属するし、一般的には時間軸上で画質等により刻々と変化する可変転送レートや固定転送レートを含んでいる。
【０１３３】
【発明の効果】
以上詳述したように本発明によれば、２つの情報信号を情報信号記録媒体に時分割記録時の連続性を保って良好に記録または記録再生することができる。
【０１３５】
更に、ユーザの使い勝ってが良くなり、また、ユーザは記録した情報信号の転送レートを所望の値に設定できる。
【図面の簡単な説明】
【図１】本発明に係る情報信号記録再生装置の全体構成を説明するためのブロック図である。
【図２】本発明に係る情報信号記録再生装置において、光ディスク上の第１，第２の領域と、トラック・バッファメモリ内の第１，第２の領域との間で、第１，第２の情報信号を一つの光ピックアップにより時分割で記録又は記録再生する状態を模式的に示した図である。
【図３】光ディスク上で第１，第２の領域（データ領域）のアドレスと、管理領域のアドレスとを示した図である。
【図４】１つの情報信号を光ディスクに記録する際に光ディスク上での空き領域の状態をディスプレイに表示した状態を示した図である。
【図５】（Ａ），（Ｂ）は２つの情報信号を光ディスクに時分割で記録、又は、記録再生する際に光ディスク上での空き領域の状態をディスプレイに表示した状態を示した図である。
【図６】第１，第２の情報信号を光ディスクに時分割で記録する形態を模式的に示した図である。
【図７】第１，第２の情報信号を光ディスクに時分割で記録する状態を示したフローチャートである。
【図８】第１，第２の情報信号を光ディスクに時分割で記録する状態を示したタイミングチャートである。
【図９】第１，第２の情報信号を光ディスクに時分割で記録再生する形態を模式的に示した図である。
【図１０】第１，第２の情報信号を光ディスクに時分割で記録再生する状態を示したフローチャートである。
【図１１】第１，第２の情報信号を光ディスクに時分割で記録再生する状態を示したタイミングチャートである。
【符号の説明】
１０…情報信号記録再生装置、
１３…情報信号記録媒体（光ディスク）、
１３ａ…第１の領域、１３ｂ…第１の領域、１３ｃ…管理領域、
１４…ヘッド（光ピックアップ）、
１９…トラック・バッファメモリ、
１９ａ…第１のバッファメモリ（第１の領域）、
１９ｂ…第２のバッファメモリ（第２の領域）、
２０…オーディオ・ビデオ／エンコーダ・デコーダ（ＡＶ−ＥＮＤＥＣ）。[0001]
BACKGROUND OF THE INVENTION
  According to the present invention, the first and second information signals based on the video information of two movies and the like and the sound information of two musics are transmitted by one pickup (or head) via the first and second buffer memories. Information signal recording / reproducing apparatus for recording or recording / reproducing on / from information signal recording medium such as light or magnetism by divisionAnd information signal recording / reproducing methodIt is about.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an optical disc apparatus (for example, a DVD player) that uses an optical disc as an information signal recording medium, an information signal such as video information such as a movie or audio information such as music is compressed and recorded on an optical disc by an optical pickup and reproduced. The compressed information signal read from the optical disk by the optical pickup is expanded. In addition, in a device to which this kind of compression / decompression technology is applied, for example, a buffer memory of about 4 Mbits is provided in the device, and a signal with a transfer rate of 10.08 Mbps read from the optical disk is transmitted from this 10.08 Mbps. The difference in transfer rate is absorbed by the buffer memory when converting to a transfer rate of a signal with a low variable transfer rate.
[0003]
Furthermore, Japanese Patent Laid-Open No. 10-92158 discloses that when recording data of a plurality of stories and scenes on a recording medium, the physical movement distance of the optical pickup at the time of reproduction is small, and the reproduction device is interrupted or disturbed. A technical idea that can suppress the occurrence of the above is disclosed. Here, it is also conceivable to record, for example, a multi-angle scene obtained by photographing the same event that proceeds simultaneously from a plurality of angles on the optical disc. The time during which data cannot be reproduced while moving the position of the optical pickup is absorbed by the buffer memory. At this time, when one desired angle is selected from several types of angles from the optical disc, a signal of one angle recorded intermittently on the optical disc is selectively selected while jumping the optical pickup. The relationship between the seek time of the optical pickup and the buffer memory capacity necessary for reproducing and absorbing the continuity of the signal during this time in the buffer memory is disclosed.
[0004]
Further, the present applicant has proposed in Japanese Patent Application Laid-Open No. 6-139696 that a buffer memory absorbs a difference in transfer rate and records and reproduces two or more signals from one disk. That is, in the recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 6-139696, digital data having a first transfer rate generated by compressing the information amount of a recording signal to be recorded / reproduced is modulated in advance. A recording operation that is modulated in accordance with the method and converted into digital data for recording / reproduction having a second transfer rate higher than the first transfer rate described above, and is recorded on the recording medium; A reproduction operation in which digital data for recording / reproduction is restored to digital data having the first transfer rate and then converted to a reproduction signal and output, an information signal for recording on the recording medium, and a reproduction signal reproduced from the recording medium This is performed in a time-sharing manner so that the information signal becomes a simultaneous signal.
[0005]
[Problems to be solved by the invention]
By the way, in the recording / reproducing apparatus disclosed in the above-mentioned Japanese Patent Laid-Open No. 6-139696, when the compression ratio of one digital audio signal is 1/5, the recording / reproducing operation is favorably performed with no play time. In recent years, with the increase in density, capacity, and digitization of information signal recording media such as optical discs, two information signals are recorded in different areas of the information signal recording media. It is required to record and reproduce two information signals alternately in a time-division manner on one information signal recording medium with one optical pickup head, and the present invention is an improvement over the prior art in order to satisfy the above requirements. It is intended.
[0006]
[Means for Solving the Problems]
  The present invention has been made in view of the above problems,It consists of a means as described in the following 1) -8).
  1)An information signal recording medium provided with first and second areas for recording first and second information signals, respectively, and a management area for recording management information indicating addresses in the first and second areas Means for rotating;
  First, SecondThe first input at the transfer rate of, SecondTemporarily memorize information signalsRuBuffer memory,
  Information signal recording mediumAgainstMovably provided,in frontThe first and second information signals read out from the buffer memory in a time-sharing manner are faster than the first and second transfer rates.RollingAt least one head for time-division recording on the first and second areas on the information signal recording medium at a transmission rate;
  A transfer rate to the first and second information signals by the one head;RecordingThe difference from the transfer rate of the first and second information signals input to the buffer memoryRecordingAn information signal recording / reproducing apparatus configured to be absorbed by a buffer memory,
  Transfer rates of first and second information signals transferred from the buffer memory to the head ... Rp,
  The selected transfer rate Ra for inputting the first information signal to the buffer memory, Ra,
  The selected transfer rate... Rb for inputting the second information signal to the buffer memory.
  Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
  When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
  in frontWritingThe address recorded in the management area on the information signal recording medium is reproduced by a button, and each empty area in the first and second areas for recording the first and second information signals is recorded. SearchInformation unit amount... Ya for transferring the first information signal from the buffer memory to the head, and Information unit amount ... Yb for transferring the second information signal from the buffer memory to the head.
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
The relational expression ofAn information signal recording / reproducing apparatus comprising: determination means for determining whether or not the first and second information signals can be recorded in each empty area in the first and second areas in a state.
[0007]
2)  As information signal recording media, there are provided first and second areas for recording first and second information signals, respectively, and a management area for recording management information indicating addresses in the first and second areas. Applied information signal recording media,
  A buffer memory for temporarily storing the first and second information signals input at the first and second transfer rates; and a time division from the buffer memory provided to be movable with respect to the information signal recording medium The first and second information signals read out in this manner are recorded in a time division manner in the first and second areas on the information signal recording medium at a transfer rate faster than the first and second transfer rates. The difference between the transfer rate of the first and second information signals by the one head and the transfer rate of the first and second information signals input to the buffer memory is determined using at least one head. Absorbed with memoryInformation signal recording and playbackA method,
  SaidheadTransfer from the buffer memory toTransfer rates of the first and second information signals ... Rp,
  Said first information signalInput the selected to the buffer memoryTransferTo ...Ra,
  Said second information signalInput the selected to the buffer memoryTransferTo ...Rb,
  in frontWritingOn the information signal recording medium.The first1'spositionOrThe second2positionIt takes to move toWhenBetween ... Tab,
  in frontWritingOn the information signal recording medium.The first2positionOrThe second1'spositionIt takes to move toWhenBetween ... Tba,
  in frontWritingThe address recorded in the management area on the information signal recording medium is reproduced by a button, and each empty area in the first and second areas for recording the first and second information signals is recorded. SearchAn information unit amount ... Ya for transferring the first information signal from the buffer memory to the head, and an information unit amount ... Yb for transferring the second information signal from the buffer memory to the head,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
Whether the first and second information signals can be recorded in each empty area in the first and second areas in a state where the relational expression is satisfiedTheRefuseHas a judgment stepInformation signal recording and reproductionMethod.
[0008]
3)  A first area in which one of the first and second information signals is recorded in advance, a second area in which the other information signal is recorded, and addresses in the first and second areas Means for rotating an information signal recording medium provided with a management area for recording management information indicating
  A buffer that temporarily stores one information signal reproduced from the information signal recording medium and outputs the information signal at a first transfer rate, and temporarily stores the other information signal input at a second transfer rate Memory,
  An operation that is movably provided with respect to the information signal recording medium, and that transfers one information signal reproduced from the information signal recording medium to the buffer memory at a transfer rate faster than the first and second transfer rates; And at least one head for performing time division on the operation of recording the other information signal input to the buffer memory on the information signal recording medium at the transfer rate,
  The buffer memory absorbs the difference between the transfer rate of the head to the first and second information signals and the transfer rate of the first and second information signals input and output from the buffer memory. didInformation signal recording / reproducing apparatusBecause
  in frontWritingByI / O to the buffer memoryThe first and second information signalsOf the issueTransfer rate ... Rp,
  The first, SecondOf information signalThe selected information signal to be recorded is input to the buffer memory.TransferTo ...Ra,
  Said1stOf the second information signalThe information signal to be reproduced is output from the buffer memory.TransferTo ...Rb,
  Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
  When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,Said one headsoThe management area on the information signal recording mediumRecorded in the abovePlay the addressThe otherInformation signalWriteBefore recordingNo.Within 2 areasky ofSearchThe information unit amount... Ya for transferring the information signal for recording from the buffer memory to the head, and the information unit amount Yb for transferring the information signal for reproduction from the head to the buffer memory.
(Ya + Yb) ≧Rp × (Ra + Rb) × (Tab + Tba)/ (Rp-Ra-Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
The relational expression ofIn state beforeNo.2 information signals beforeNo.Within 2 areasky ofWhether recording is possibleTheRefuseEquipped with judgment meansAn information signal recording / reproducing apparatus.
[0009]
4)  As an information signal recording medium,A first area in which one of the first and second information signals is recorded in advance, a second area in which the other information signal is recorded, and addresses in the first and second areas An information signal recording medium provided with a management area for recording management information indicatingApply,
  One information signal reproduced from the information signal recording medium is temporarily stored and output at the first transfer rate.WithTemporarily storing the other information signal input at the second transfer rateRuBuffer memory and the information signal recording mediumAgainstMovably provided,in frontOne information signal reproduced from the information signal recording medium is faster than the first and second transfer rates.RollingPrevious at feed rateRecordingBefore transferring to the buffer memoryRecordingThe other information signal input to the buffer memoryReprintAt least one head that performs time-division recording on the information signal recording medium at a transmission rate.Usein frontWritingTransfer rate to the first and second information signals by the,in frontThe buffer memory absorbs the difference between the transfer rates of the first and second information signals input and output from the buffer memory.WestInformation signal recording and playbackMethodBecause
  Transfer rates of first and second information signals input / output to / from the buffer memory by the head... Rp,
  The selected transfer rate... Ra, in which the information signal to be recorded of the first and second information signals is input to the buffer memory.
  The transfer rate for outputting the information signal to be reproduced from the first and second information signals from the buffer memory ... Rb,
  Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
  When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
  Reproducing the address recorded in the management area on the information signal recording medium with the one head, and searching for a free area in the second area for recording the other information signal,The information unit amount... Ya for transferring the information signal for recording from the buffer memory to the head, and the information unit amount Yb for transferring the information signal for reproduction from the head to the buffer memory.
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
The relational expression ofDetermining whether or not the second information signal can be recorded in an empty area in the second area in a state;StepTheHaveInformation signal recording and reproductionMethod.
[0010]
5)  Described in 1) or 3)In the information signal recording / reproducing apparatus ofThe recordable state of the empty area determined by the determination unit is displayed.An information signal recording / reproducing apparatus.
[0011]
6)  As described in 2) or 4)Information signal recording and playbackMethodInA step of displaying a recordable state of the free area determined in the determination step.Information signal recording and reproductionMethod.
[0012]
7)  1) or 3)In the information signal recording / reproducing apparatus according to claim 1, the recordable state of the empty area determined by the determining means is displayed.When calculating the ratio of the capacity in the recordable free space to the total free space capacity,An information signal recording / reproducing apparatus characterized by displaying.
[0013]
8)  Described in 2) or 4)Information signal recording and playbackMethodIn the above judgmentStepWhen displaying the recordable state of the free area determined by the above, the ratio of the capacity in the recordable free area to the total free area capacity is calculated to display the recordable efficiency.Having stepsInformation signal recording and reproductionMethod.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an information signal recording / reproducing apparatus according to the present invention will be described below in detail with reference to FIGS.
[0015]
In the information signal recording / reproducing apparatus according to the present invention, the information signal recording medium can be applied to optical disks such as DVD-RAM, DVD-RW, DVD + RW, and magnetic disks such as hard disks and floppy disks. In the embodiment, a case where an optical disk is applied as an information signal recording medium will be described.
[0016]
FIG. 1 is a block diagram for explaining the overall configuration of an information signal recording / reproducing apparatus according to the present invention.
[0017]
As shown in FIG. 1, in an information signal recording / reproducing apparatus (optical disc player) 10 according to the present invention, an optical disc (information signal recording medium) 13 is rotatably provided on a turntable 12 attached to a spindle motor 11 shaft. ing.
[0018]
Further, an optical head (hereinafter referred to as an optical pickup) 14 is provided so as to be movable in the radial direction of the optical disk 13 so as to face the optical disk 13. The optical pickup 14 described above irradiates a laser spot on the optical disk 13 with a collimator lens, an objective lens, or the like, using a semiconductor laser provided inside, although not shown in the figure, as a light source. At this time, the semiconductor laser is driven by a laser driving circuit. When recording an information signal such as an audio signal or a video signal, the input information signal is input to the laser driving circuit after being corrected by the waveform correcting circuit. The
[0019]
In addition, the system controller 22 determines a recording or recording / reproduction start command by selecting a plurality of keys 23 and commands the signal processing circuit 18 and the servo circuit 17. The signal read from the optical pick 14 is read by the preamplifier 16. A reproduction signal and a servo signal are generated, and the optical pickup 14 processes the servo signal by the servo circuit 17 to generate a focusing and tracking signal for the track on the optical disk 13, and the driver circuit 15 generates the optical pickup. The actuator in 14 is driven to perform one-round servo control of the optical pickup 14, and based on the control data on the optical disc 13, the optical pickup 14 is fed to the feed motor so as to reproduce the sector of the target track on the optical disc 13. The optical disk 13 It is moving in the radial direction.
[0020]
In addition, the reproduction signal read out from the optical pickup 14 with one correction block as the minimum unit is optimized in frequency characteristics by the preamplifier 16 using an equalizer, and is subjected to PLL, and the PLL bit clock and data time A jitter generation circuit generated from the comparison of the axes is provided, and the jitter value is measured by the system controller 22 by A / D conversion, and the waveform correction circuit at the time of recording is changed according to this value.
[0021]
In addition, the signal processing circuit 18 converts the signal into a digital signal, for example, performs synchronization detection, decodes the EFM + signal on the optical disk 13 into NRZI data, performs error correction processing in units of correction blocks, and generates a sector address signal. First and second information signals to be described later are obtained. Since these first and second information signals are signals compressed at a variable transfer rate, one correction block is minimized in a track buffer memory 19 using a 64-Mbit DRAM serving as a temporary storage means. Is temporarily stored as a unit of time and the time axis of the variable transfer rate of the first and second information signals is absorbed. A signal read from the track buffer memory 19 is obtained from first and second information signals compressed based on MPEG2 by a decoder in an audio video / encoder decoder (hereinafter referred to as AV-ENDEC) 20. The audio signal and the video signal are expanded and separated, and the audio signal and the video signal are output to the display 25 through the NTSC encoder 24 as audio and video signals. Reference numerals 26 and 27 are input terminals for inputting the first and second information signals, respectively.
[0022]
In this AV-ENDEC 20, the decompression speed is determined according to the recording or recording / reproducing mode described later by the control data written on the optical disc 13, and the decompression is performed according to this, and the buffer memory 21 is connected. Yes.
[0023]
Further, the speed signal of the optical disk 13 generated by the PLL of the preamplifier 16 is sent to the servo circuit 17, and the optical disk 13 is controlled to rotate at CLV by this speed signal. Further, a rotational position signal such as a Hall element of the spindle motor 11 is fed back to the servo circuit 17, and a constant rotation FG control is provided from a speed signal generated from this signal. The system controller 22 performs overall control between the LSIs.
[0024]
The microcomputer in the system controller 22 recognizes key input and control data from the outside in order to set the resolution of the image to be recorded, fast scenes such as car races, etc. , A switching terminal is provided so that the recording time can be changed and the setting can be selected by an external user.
[0025]
Further, as will be described later, the user reproduces the video signal recorded on the optical disc 13, records the video signal, and records the video signal currently being recorded on the optical disc 13 as it is. The video signals and the like in different areas can be reproduced. Further, the video signal or the like can be recorded in different areas on the optical disc 13 while the video signal being currently reproduced is being reproduced as it is. Similarly, a video signal or the like can be recorded in different areas on the optical disc 13 while the video signal currently being recorded is being recorded as it is. Thereby, the user can enjoy functions such as post-recording recording and back program recording.
[0026]
  Here, in the information signal recording / reproducing apparatus 10 according to the present invention, between the first and second areas 13 a and 13 b on the optical disc 13 and the first and second areas 19 a and 19 of the track buffer memory 19. FIG. 2 and FIG. 3 are used in the case of recording or recording / reproducing the first and second information signals in a time-division manner by using one optical pickup 14 with video information such as two movies and voice information such as two music. Explain.
[0027]
FIG. 2 shows an information signal recording / reproducing apparatus according to the present invention, wherein the first and second areas between the first and second areas on the optical disc and the first and second areas in the track buffer memory are shown. It is the figure which showed typically the state which records or records / reproduces an information signal by one optical pick-up by time division. In FIG. 2, the preamplifier and the signal processing circuit are not shown for easy understanding.
FIG. 3 shows the addresses of the first and second areas (data areas) and the address of the management area on the optical disc.
[0028]
As shown in FIG. 2, the first area 13a on the optical disc 13 is a data area for recording the first information signal A having the recording capacity Ya as the minimum unit for recording and reproduction (for example, the address A1 area in FIG. 3). The second area 13b is a data area for recording the second information signal B having the recording capacity Yb as the minimum unit for recording and reproduction (for example, the address B1 area in FIG. 3). At this time, the first information signal A and the second information signal B may be information that is related to each other or information that is not related at all.
[0029]
Here, as shown in FIG. 3A, the first area 13a on the optical disc 13 is separated into a plurality of areas within a range in which a seek time to be described later can be observed, and addresses A1, A2, A3 for each area. ,... Are provided so that the first information signal A can be divided and recorded. Similarly, as shown in FIG. 3B, the second area 13b on the optical disc 13 is also divided into a plurality of areas within a range in which a seek time described later can be observed, and addresses B1, B2, B3,. Thus, the second information signal B can be divided and recorded. At this time, the optical pickup 14 is between the first address area A1 in the first area 13a to be recorded or reproduced first and the first address area B1 in the second area 13b to be recorded or reproduced next. Is set in a range that can move within, for example, 1.5 seconds, in other words, the light that moves between the first information signal A and the second information signal B to be recorded or reproduced next is totally. The seek time of the pickup 14 is a maximum of 1.5 seconds.
[0030]
Returning to FIG. 2, a management area 13c is provided in the inner peripheral portion of the optical disc 13, and this management area 13c is allocated as an area of an address C {eg, address C1, C2,... Area} in FIG. If the first and second information signals A and B are not recorded in the address areas of the first and second areas 13a and 13b, the start address and end address as free areas are managed. On the other hand, when the first and second information signals A and B are recorded in the address areas of the first and second areas 13a and 13b, the first and second information signals A and B are recorded. The start address and end address associated with B, the transfer rate of these information signals, title information, copyright information, etc. are recorded and managed.
[0031]
A first buffer memory (hereinafter referred to as a first area) 19 a in the track buffer memory 19 is an area for temporarily storing the first information signal A, and the first buffer memory 19 in the track buffer memory 19. The second buffer memory (hereinafter referred to as a second area) 19b is an area for temporarily storing the second information signal B.
[0032]
  One optical pickup 14 transfers the first information signal A and the second information signal B between the optical disc 13 and the track buffer memory 19 in a time-sharing manner, and the optical pickup 14 The transfer rate Rp of the first and second information signals A and B is set to be constant, and this constant transfer rate Rp is assumed to be, for example, 25 Mbps. The first and second information signals A by the one optical pickup 14 described above,B'sThe transfer rate Rp is set to a value faster than transfer rates Ra and Rb of first and second information signals A and B described later.
[0033]
Also, the first and second information signals A and B are transferred between the track buffer memory 19 and the AV-ENDEC 20, and at this time, the transfer rate of the first information signal A is set as the transfer rate Ra. The transfer rate of the second information signal B is assumed to be the transfer rate Rb. The present invention is characterized in that the first information signal A and the second information signal B can be recorded or recorded continuously as will be described later.
[0034]
Here, the transfer rates Ra and Rb of the first and second information signals A and B can be selected with priority on image quality. For example, 8 Mbps, 4 Mbps, and 2 Mbps shown in (1) to (3) below. One of the transfer rates.
(1). A mode with a transfer rate for high image quality, for example, a recording time of 2 hours at 8 Mbps,
(2). A mode with a transfer rate for slightly higher image quality, eg 4 Mbps recording time 4 hours,
(3). For example, a transfer rate for normal image quality and a recording time of 8 hours at 2 Mbps, for example.
Are prepared, and when recording on the optical disc 13, the transfer rates Ra and Rb of the first and second information signals A and B are set by designating the mode by key input by the user. 13, the compression rate at the time of recording is read out from the control data recorded in the management area 13c in association with the first and second information signals A and B, and the first and second information signals A and B are read according to this value. , B transfer rates Ra and Rb are set.
[0035]
Further, the system controller 22 shown in FIG. 1 uses the first and second areas 19a and 19b in the 64-Mbit track buffer memory 19 for the transfer rates Ra and Rb of the first and second information signals A and B, respectively. In addition to division setting according to the value (= Ra: Rb), each region 19a, 19b has an EMPTY value indicating that the storage capacity is empty and a FULL value indicating that the storage capacity is full in the first and second information. It is set according to the values of the transfer rates Ra and Rb of the signals A and B. The system controller 22 constantly monitors the remaining storage capacity between the EMPTY value and the FULL value of each of the areas 19a and 19b in the track buffer memory 19.
[0036]
As a different embodiment, the first and second areas 19a and 19b in the track buffer memory 19 are divided according to the transfer rates Ra and Rb of the first and second information signals A and B as described above. Rather than divide by recording mode or playback mode. For example, when one information signal A (B) is reproduced and the other information signal B (A) is recorded on the assumption that the two information signals A and B have the same transfer rate, the reproduced signal is somewhat reproduced during reproduction. Even if the continuity is lost, it does not cause a big problem. However, if the recording signal cannot be continuously recorded, it becomes a fatal defect. For example, the recording area occupies more area in the track buffer memory 19. Keep it. In this process, when the system controller 22 inputs a recording or reproduction instruction, the data in the track buffer memory 19 is confirmed in the same manner as described above, and it is confirmed that there is no intermediate data during reproduction or recording. To do.
[0037]
In the information signal recording / reproducing apparatus 10 according to the present invention described above,
(1). First and second information signals A and B which are respectively input at the first and second transfer rates Ra and Rb and temporarily stored in the first and second areas 19a and 19b of the track buffer memory 19 are stored. When recording is performed in a time division manner on the first and second areas 13a and 13b on the optical disc 13 at a constant transfer rate Rp faster than the first and second transfer rates Ra and Rb by the optical pickup 14.
(2). One of the first and second information signals A and B having the first and second transfer rates Ra and Rb is sent from one area 13a (13b) on the optical disk 13 to the information signal A (B). Reproduced in time division by the optical pickup 14 and temporarily stored in one area 19a, (19b) of the track buffer memory 19 at a constant transfer rate Rp faster than the first and second transfer rates Ra, Rb. The other information signal B (A) is temporarily read from the other area 19b, (19a) of the track buffer memory 19 by the optical pickup 14 at a constant transfer rate Rp, and the other area 13b ( 13a) is recorded in a time-sharing manner. At this time, only one of the first and second information signals A and B can be recorded or reproduced by one optical pickup 14.
[0038]
Now, when two information signals A and B are recorded on the optical disc 13 by time division by one optical pickup 14, or when recording and reproducing by time division, the optical disc 13 and the track buffer via the optical pickup 14 are recorded. An operation condition for maintaining continuity in time division with the memory 19 will be described.
[0039]
  Transfer rate to the first and second information signals A and B by the optical pickup 14... Rp (Mbps)
  Transfer rate of the first information signal A ... Ra (Mbps)
  Transfer rate of second information signal B ... Rb (Mbps)
  Minimum storage capacity of the track buffer memory 19 ... Ym (Mbit)
  Recording capacity of the first information signal A recorded in the first area 13a on the optical disc 13 ... Ya (Mbit)
  Recording capacity of the second information signal B recorded in the second area 13b on the optical disc 13 ... Yb (Mbit)
  The seek time required for the optical pickup 14 to move from the first area 13a to the second area 13b on the optical disk 13 ... Tab(S)
  The seek time required for the optical pickup 14 to move from the second area 13b on the optical disc 13 to the first area 13a ... Tba (s)
  Then, this relationship needs to satisfy the following (formula 9) to (formula 11) which are the main part of the present invention.
[0040]
  Seek time T hereab(Tba) means that recording or reproduction is stopped at the recording end position or the reproduction end position of the information signal A (B) in the area 13a (13b) on the optical disc 13, and the optical pickup 14 continues to the next area 13b (13a). The optical pickup 14 that has moved to the next area 13b (13a) confirms the address on the target track in the area 13b (13a) and finishes the preparation work for recording or reproduction. The time until the recording or reproduction of the information signal B (A) is started is shown.
[0041]
The first and second information signals A input and output to the first and second areas 19a and 19b of the track buffer memory 19 when the two information signals A and B are recorded or recorded in a time division manner. , B transfer rates Ra, Rb (= Ra + Rb) between the first and second areas 13a, 13b on the optical disc 13 and the first and second areas 19a, 19b of the track buffer memory 19 Thus, the transfer rate Rp by one optical pickup 14 for transferring the first and second information signals A and B in a time division manner should not be exceeded.
[0042]
When the above case is expressed by an expression,
Rp> Ra + Rb (1 formula)
It becomes.
[0043]
The recording time or reproducing time Ta (s) at which the optical pickup 14 records or reproduces the first information signal A is Ta = Ya / Rp (Equation 2)
The recording time or reproducing time Tb (s) at which the optical pickup 14 records or reproduces the second information signal B is Tb = Yb / Rp (Equation 3)
It is.
[0044]
Further, the transfer rate Rp to the first and second information signals A and B by the optical pickup 14, the transfer rate Ra of the first information signal A and the transfer rate Rb of the second information signal B from this transfer rate Rp. The ratio to the difference value obtained by subtracting
Rp / (Rp-Ra-Rb) (4 formulas)
It is. At this time, Rp corresponds to one cycle period from the time when the first and second information signals A and B are recorded or recorded / reproduced in a time division manner to the next time when the first information signal A is recorded or reproduced, Rp-Ra-Rb) corresponds to the seek period in this one cycle period.
[0045]
  On the other hand, the first and second information signals A and B are recorded or recorded and reproduced in a time division manner, and then the first information signal A is recorded or reproduced.InThe ratio between the time for one cycle and the total seek time during this one cycle period is (Ta + Tab + Tb + Tba) / (Tab + Tba) (Formula 5)
It is.
[0046]
Here, since the ratio of the above-mentioned (formula 4) and the ratio of the above-mentioned (formula 5) are in equal relation,
Rp / (Rp−Ra−Rb) = (Ta + Tab + Tb + Tba) / (Tab + Tba) (Expression 6)
When this (formula 6) is transformed,
(Ta + Tb) = (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Expression 7)
It becomes. Substituting (Expression 2) and (Expression 3) into (Expression 7)
(Ya + Yb) = Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Expression 8)
It becomes.
[0047]
Here, the transfer rate Rp between the optical disc 13 and the track buffer memory 19 is set to constant transfer rates Ra and Rb faster than the transfer rates Ra and Rb of the first and second information signals A and B. On the other hand, the transfer rates Ra and Rb of the first and second information signals A and B are determined by user settings at the time of recording, and are determined by the recording state recorded on the optical disc 13 at the time of reproduction. Furthermore, since the seek times Tab and Tba of the optical pickup 14 described above are determined by the address on the optical disc 13 to be reproduced and the specifications of the apparatus, in order to satisfy this relationship stably, recording or recording / reproduction is performed. The recording capacity Ya of the first information signal A and the capacity Yb of the second information signal B, which are the minimum capacity for continuous execution, satisfy the following (Equation 9), (Equation 10), and (Equation 11). Must.
[0048]
That is,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb) (Equation 9)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb) (Expression 10)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb) (Expression 11)
That is, the transfer rate Rp by the optical pickup 14, the transfer rates Ra and Rb of the first and second information signals A and B, and the optical pickup that moves between the first and second regions 13 a and 13 b on the optical disc 13. When the 14 seek times Tab and Tba are determined, the recording capacities Ya and Yb of the minimum recording units of the first and second information signals A and B, or the recording times or reproducing times Ta and Tb are set as described above (formula 9). ) To (11) is not satisfied, the continuity in recording or recording / reproducing both information signals A and B is lost.
[0049]
In short, when the two information signals A and B are recorded or recorded on the optical disc 13 in a time-sharing manner, the position where the data to be recorded or reproduced following Ya or Yb is present on the optical disc 13 Ya or Yb. This indicates that it can be continuously recorded or recorded / reproduced even at a distant position.
[0050]
In addition, (Equation 9) to (Equation 11) determine the recording capacities Ya and Yb of the minimum recording area of the two information signals A and B, determine the maximum size of the track buffer memory 19, and EMPTY value and FULL value are determined.
[0051]
The basic minimum storage capacity Ym of the track buffer memory 19 is
Ym> (Tb + Tab + Tba) × Ra + (Ta + Tab + Tba) × Rb (Expression 12)
Or
Ym> Ta × (Rp−Ra) + Tb × (Rp−Rb) (13)
It becomes.
[0052]
(Equation 12) and (Equation 13) are both (Equation 2), (Equation 3), (Equation 10),
From (11 formulas)
Ym> {(Rp−Ra) × Ra + (Rp−Rb) × Rb} × (Tab + Tba) / (Rp−Ra−Rb) (Expression 14)
It becomes.
[0053]
Therefore, basically, the first area 19a of the track buffer memory 19 for the first information signal A is secured to (Rp−Ra) × Ra × (Tab + Tba) / (Rp−Ra−Rb) or more. The EMPTY value and the FULL value are determined in this range, and the second area 19b of the track buffer memory 19 for the second information signal B is (Rp−Rb) × Rb × (Tab + Tba) / (Rp−Ra -Rb) The above is secured and the EMPTY value and the FULL value are determined within this range.
[0054]
However, this is a numerical value that has no margin in the management of the track buffer memory 19, and secondly, ideal two information signals A and B are alternately shown as shown in FIGS. In practice, the two information signals A and B are simultaneously recorded or recorded / reproduced according to the transfer rate between the two information signals A and B and the input / output timing. In this time interval, it is necessary to temporarily store the information signal on one side in the track buffer memory 19 and absorb it.
[0055]
Accordingly, the minimum storage capacity Ym of the track buffer memory 19 in this case is Ym> (Ta + Tb + Tab + Tba) × (Ra + Rb) (Equation 15)
More generally, if the seek times Tab and Tba are the same fixed time and T,
Ym> (Ta + Tb + 2 × T) × (Ra + Rb) (Expression 16)
It becomes. Since the Ym value does not calculate the retry processing, the function as a shock proof memory, or other system margins, it is necessary to secure at least a value equal to or greater than this value.
[0056]
Therefore, the first area 19a of the track buffer memory 19 for the first information signal A is secured to (Ta + Tb + 2 × T) × Ra or more, and the EMPTY value and the FULL value are determined within this range, and the second information signal The second area 19b of the track buffer memory 19 for B is secured to (Ta + Tb + 2 × T) × Rb or more, and the EMPTY value and the FULL value are determined within this range.
[0057]
Also, the above (15 formula) and (16 formula) are derived from the above (2 formula), (3 formula), and (9 formula).

More generally, when the seek times Tab and Tba are set to T of the same fixed time required to move between the innermost circumference and the outermost circumference of the optical disc 13,
Ym> 2 * Rp * (Ra + Rb) * T / (Rp-Ra-Rb) (18 formulas)
It becomes.
[0058]
Similarly, since the Ym value does not calculate the retry processing, the function as a shock proof memory, or other system margins, it is necessary to secure at least a value equal to or greater than this value.
[0059]
Accordingly, the first area 19a of the track buffer memory 19 for the first information signal A is secured to Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb) or more, and the EMPTY value and the FULL value are set within this range. The second area 19b of the track buffer memory 19 for the second information signal B is secured to Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb) or more, and the EMPTY value and the FULL value in this range To decide.
[0060]
Here, the track buffer memory 19 is a 64 Mb track buffer memory 19 connected to the signal processing circuit 18 of FIG. 1 in this embodiment, but naturally it is 64 Mb connected to the AV-ENDEC 20 of FIG. Similarly, a part of the buffer memory 21 may be used as a track buffer memory.
[0061]
That is, the track buffer memory 19 has a transfer rate Rp to the information signals A and B by the optical pickup 14 for the information signal recording medium such as the optical disc 13 and a transfer rate Ra, It absorbs the difference in Rb. However, in this embodiment, the first information signal A and the second information signal B are required by using the 64 Mb track buffer memory 19 connected to the signal processing circuit 18 of FIG. 1 as an example. By dividing the recording capacity of one track buffer memory 19 and allocating and using the surplus area as a result of the calculation, the margin of each track buffer can be increased.
[0062]
For example, the transfer rate Ra of the first information signal A is 8 Mbps, the required storage capacity of the first area 19a of the track buffer memory 19 is 32 Mb for the first information signal A, If the transfer rate Rb of the information signal B is 4 Mbps and the required storage capacity of the second area 19b of the track buffer memory 19 is 16 Mb for the second information signal A, the remaining area is 64 Mb. The remaining 16 Mb is not left unaltered, but is divided into 2 to 1 by about 10 Mb to 5 Mb, and the storage capacity of the first area 19 a of the track buffer memory 19 is set to 32 Mb + 10 Mb = 42 Mb, and the track buffer memory 19 The track buffer memory 19 is made effective by setting the storage capacity of the second area 19b of the memory to 16Mb + 5Mb = 21Mb It can be used. Thereby, two continuous information signals A and B can be processed simultaneously.
[0063]
Here, in the case of the optical disc 13, the maximum allowable times Tmax = (Tab · max) and (Tbc · max) of the seek times Tab and Tbc by the optical pickup 14 are standardized in advance, and this maximum allowable time ( Tab · max) and (Tbc · max) are both the same value, for example, 1.5 seconds for the recordable DVD optical disc 13. Therefore, if the above conditions are applied to (Equation 9) described above,

It will be.
[0064]
Next, when two information signals A and B are recorded on the optical disc 13 in a time division manner by one optical pickup 14, it is necessary to know each empty area in the first and second areas on the optical disc 13. Alternatively, when one of the two information signals A and B is reproduced from the optical disc 13 by time division and the other is recorded on the optical disc 13 by time division, it is necessary to know the free area.
[0065]
Therefore, here, the start address and end address of the free area are identified from the interval between the start address and end address of the data area recorded in the management area 13c on the optical disc 13, and the capacity of the independent free area is calculated. Then, the capacity of the empty area and the position information of the empty area are stored together, and this is repeated to calculate and store the same for all the empty areas.
[0066]
At this time, when the transfer rate of the information signal to be recorded is three types, for example, 2, 4, and 8 Mbps, it is determined by calculation whether the capacity of each independent free area can be continuously recorded or continuously recorded and reproduced.
[0067]
For the seek time of one optical pickup 14, since the rotation of the optical disk 13 is CLV controlled, the address difference between the addresses is calculated, and the seek table stored in the program ROM in the system controller 22 is referred to. The number of track movements based on the address difference is obtained. The seek time of the optical pickup 14 is calculated by calculating a predetermined coefficient. Alternatively, the seek time of the optical pickup 14 may be set as a predetermined constant value depending on the device, or may be set as the maximum allowable seek time determined by the standard.
[0068]
Here, as a preliminary step for explaining whether or not the information signal to be recorded in the empty areas in the first and second areas 13a and 13b on the optical disk 13 in the present invention can be recorded, recording and reproduction of a general optical disk In the case of the method, when one information signal A inputted to one track buffer memory at a transfer rate Ra is recorded on an optical disc at a transfer rate Rp faster than the transfer rate Ra by one optical pickup, information to be recorded in a free area. In order to maintain the continuity of the signal, in the above (Equation 9) or (Equation 19), the portion related to the information signal B is set to zero,
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra) (Expression 21)
Or
Ya ≧ 2 × Rp × Ra × Tmax / (Rp−Ra) (Expression 22)
Should be satisfied.
[0069]
In other words, the capacity corresponding to the transfer rate of one information signal during the seek time is larger than the capacity corresponding to the difference between the transfer rate of one optical pickup and the transfer rate of one information signal input to one track buffer memory. Do not exceed. The required value of this seek time varies depending on the transfer rate of one input information signal that is a variable. Therefore, the recordable area greatly varies depending on the transfer rate of one information signal when actually recording.
[0070]
The formula (21) or (22) described here may be simplified as appropriate when it is created by software or hardware. For example, a calculation result is stored in a table in a program ROM in the system controller. You may obtain the result by referring to this.
[0071]
As a result of the above, the system controller determines the total free area capacity, the recording time (or capacity) corresponding to the recordable area at each total transfer rate, and the total free area capacity. The ratio of the capacity in the recordable free space is calculated and the recordable efficiency is displayed on the display as shown in FIG. 4, for example, to notify the user.
[0072]
On the other hand, according to the present invention, the first information signal A input to the first area 19 a in the track buffer memory 19 at the first transfer rate Ra and the second information 19 in the second area 19 b in the track buffer memory 19. The second information signal B input at the transfer rate Rb of 2 and the first and second areas on the optical disc 13 at a transfer rate Rp faster than the first and second transfer rates Ra and Rb by one optical pickup 14. When recording in time division in each free space in 13a and 13b, the addresses of the first and second areas 13a and 13b recorded in the management area 13c on the optical disc 13 are reproduced by one optical pickup 14, Each empty area in the first and second areas 13a and 13b on the optical disk 13 on which the first and second information signals A and B are recorded is searched, and one optical pickup 14 and a track The first and second information signals A and B on the optical disk 13 are transmitted to the first and second areas 19a and 19b in the buffer memory 19 while maintaining continuity during time-division recording. The system controller 22 determines whether or not recording is possible in each empty area in the second areas 13a and 13b.
[0073]
In the present invention, one of the first and second information signals A and B is reproduced from one area 13a (or 13b) of the optical disc 13, and the other information signal A (or B) is reproduced. When recording and reproducing the information signal B (or A) in the other area 13b (or 13a) of the optical disc 13 in a time-division manner with one optical pickup 14, the single optical pickup 14 uses the optical signal on the optical disc 13. The addresses of the first and second areas 13a and 13b recorded in the management area 13c are reproduced, and the other information signal B (or A) is recorded in the other area 13b (or 13a) on the optical disc 13B. An empty area is searched to maintain continuity during time-division recording / reproduction between one optical pickup 14 and the first and second areas 19a and 19b in the track buffer memory 19 during recording / reproduction. The other information signals B (or A) the system controller 22 whether or not can be recorded in free space in the second region 13b on the optical disk 13 (or the first region 13a) in state is determined.
[0074]
In either case of the recording operation of the first and second information signals A and B or the recording and reproducing operation of the first and second information signals A and B, one optical pickup 14 and a track In order to maintain continuity in time division with the first and second areas 19a and 19b in the buffer memory 19, it is determined whether or not (Equation 9) or (Equation 19) is satisfied. The information signal to be recorded in the empty area is recorded after the system controller 22 determines.
[0075]
The above formula (9) or (19) may be calculated by the system controller 22 each time recording or recording / reproducing is performed. However, the calculation results are tabulated in advance in the program ROM in the system controller 22. A result may be obtained by referring to this table.
[0076]
At this time, in the above-described (Expression 9) or (Expression 19), for example, the transfer rate Rp = 25 Mbps of the first and second information signals A and B by the optical pickup 14 is stored in the track buffer memory 19. If the sum of the transfer rates Ra and Rb of the first and second information signals A and B input and output in time division to the first and second areas 19a and 19b exceeds this, the two information signals A , B cannot be recorded or recorded, so this is also notified to the user. In this case, for example, when Ra = 8 Mbps, Rb = 17 Mbps, which does not satisfy the above-described (Equation 9) or (Equation 19). ).
[0077]
Again, as a result of the above, the system controller 22 determines the capacity of the total free area, the recording time (or capacity) corresponding to the recordable area at the total transfer rate, and the total free area. The recordable efficiency obtained by calculating the ratio of the capacity in the recordable free space to the capacity is displayed on the display 25 as shown in FIGS. 5A and 5B, for example, to notify the user.
[0078]
In the display examples shown in FIGS. 5A and 5B, for example, when one information signal with a transfer rate of 8 Mbps is recorded or reproduced in a time division manner and the other information signal is recorded in a time division manner, Effective free space and recordable efficiency are shown. This display method may show calculation results when information signals of all transfer rates are recorded or recorded / reproduced. However, when one information signal as shown in FIG. 4 is recorded, there is no space when two information signals as shown in FIGS. 5A and 5B are recorded or recorded and reproduced. It is desirable to inform the user of this because there may be a reduction in efficiency when recording the area. In the above display example, the recording time and the free space are shown at the same time, but the free space may not be displayed. Further, instead of directly displaying the transfer rate value, the transfer rate value may be displayed for high image quality, slightly high image quality, normal image quality, etc. as described above, or the recording time is 2 hours. Mode, a recording time mode of 4 hours, a recording time mode of 8 hours, and the like.
[0079]
By informing the user of the efficiency with which this relationship can be recorded, the user can set the transfer rate more efficiently.
[0080]
From this display information, the user knows the waste area and recordable time at each transfer rate, so the user can use keys and remote controls according to the video and audio information to be recorded and the free space and waste area. Enter the transfer rate and select one. When the transfer rate is not set, a predetermined value such as the maximum transfer rate may be automatically set.
[0081]
<When recording two information signals in time division>
FIG. 6 is a diagram schematically showing a mode in which the first and second information signals are recorded on the optical disc in a time-sharing manner,
FIG. 7 is a flowchart showing a state in which the first and second information signals are recorded on the optical disc in a time division manner.
FIG. 8 is a timing chart showing a state in which the first and second information signals are recorded on the optical disc in a time division manner.
[0082]
As shown in FIG. 6, the first and second information signals A and B input to the first and second areas 19a and 19b of the track buffer memory 19 at the first and second transfer rates Ra and Rb, respectively. The optical pickup 14 performs a time division recording operation on the first and second areas 13a and 13b on the optical disc 13 at a constant transfer rate faster than the first and second transfer rates Ra and Rb.
[0083]
That is, the optical disc 13 is formed so as to be recordable and reproducible. On the optical disc 13, a first area 13a for recording a first information signal A having a recording capacity Ya and a second area having a recording capacity Yb. And a second area 13b for recording the information signal B, and a management area 13c in which the start address and end address of the first and second areas 13a and 13b are recorded on the optical disc 13. Is provided.
[0084]
Further, when recording on the optical disc 13, the MPEG encoder in the AV-ENDEC 20 is a recording mode in which the user designates the transfer rates Ra and Rb of the first and second information signals A and B (transfer rate 8Mbps for high image quality, The first and second information signals A and B to be recorded can be set from the AV-ENDEC 20 to the signal processing circuit 20 (see FIG. 5), which can be set with a transfer rate of 4 Mbps for a slightly higher image quality and a transfer rate of 2 Mbps for a normal image quality. 1) temporarily stored in the first and second areas 19a and 19b of the 64 Mb track buffer memory 19 connected to 1), and at this time, the optical pickup 14 is in a standby state and tracks on the optical disk 13 to be recorded in a predetermined state. And is waiting for a kick. If the capacity of each area 19a, 19b of the track buffer memory 19 reaches the FULL value while controlling the remaining amount in each area 19a, 19b of the track buffer memory 19, an error occurs during recording on the optical disc 13. The first information signal A stored in the first area 19a of the track buffer memory 19 and the second area 19b stored in the track buffer memory 19 are added with the correction code, address and sync signal. The second information signal B is alternately read out in a time division manner, and the first information signal A read out by the optical pickup 14 at a constant transfer rate Rp faster than the transfer rates Ra and Rb is read on the first area 13a on the optical disc 13. In addition, the second information signals B are alternately recorded in the second area 13b on the optical disc 13 in a time division manner. This is repeated to perform continuous recording.
[0085]
Here, the operation of recording the two information signals A and B in a time division manner will be described with reference to FIGS. In FIG. 8, the transfer rates Ra and Rb of the first and second information signals A and B are shown at the same transfer rate for the sake of illustration, but show the same tendency even when they are different. is there.
[0086]
First, in step S51, a recording flow is started.
[0087]
Next, in step S52, the optical pickup 14 reproduces the management area 13c on the optical disc 13.
[0088]
Next, in step S53, when the optical pickup 14 reproduces the management area 13c on the optical disc 13, each empty area in the first and second areas on the optical disc 13 is searched based on the address information from the management area 13c. . Then, after searching for each empty area in the first and second areas on the optical disc 13, the system controller 22 stores the first and second empty areas in the first and second areas on the optical disc 13. Whether or not the information signals A and B can be recorded in a time-sharing manner is determined by the above-described (Equation 9) or (Equation 19), and this result is displayed on the display 25 as previously described in FIG. In addition to the display in FIG. 1, if recording is possible, the process proceeds to the next step S54.
[0089]
Next, in step S54, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a where recording is desired on the optical disc 13. If the address area A1 (target position) has not been reached, step S54 is continued. If the address area A1 (target position) has been reached, the process proceeds to the next step S55.
[0090]
Next, in step S55, the first information signal A sent from the AV-ENDEC 20 side at the transfer rate Ra is temporarily stored in the first area 19a of the track buffer memory 19. At this time, the system controller 22 (FIG. 1) constantly monitors the EMPTY value and the FULL value of the first area 19a in the track buffer memory 19 until the first information signal A reaches the FULL value. Stored at the transfer rate Ra.
[0091]
Next, in step S56, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, the process proceeds to step S55. On the other hand, if the FULL value is reached, the process proceeds to the next step S57.
[0092]
Next, in step S57, when the first information signal A reaches the FULL value, the first information signal A is read out to the optical pickup 14 side at a constant transfer rate Rp, so that the FULL value as shown in FIG. And the EMPTY value, the first information signal A decreases at a slope of the difference (Rp−Ra), while the first information signal A is reduced by the optical pickup 14 at a constant transfer rate Rp. Recorded in the area 13a.
[0093]
Next, in step S58, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, step S57 is executed. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S59.
[0094]
Next, in step S59, since the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value, the optical pickup 14 moves the first area 13a on the optical disc 13 to the first area 13a. Among them, the recording in the first address area A1 is stopped. Here, after the recording of the first information signal A is stopped, the first information signal A is continuously sent from the AV-ENDEC 20 side to the first area 19a in the track buffer memory 19 at the transfer rate Ra. However, as is apparent from FIG. 8, this write operation may be completed before the period until the FULL value is reached, before the second address area A2 is started to be recorded in the first area 13a.
[0095]
Next, in step S60, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 in order to record the second information signal B next. At this time, the seek time Tab for the optical pickup 14 to move from the first address area A1 in the first area 13a on the optical disk 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.
[0096]
Next, in step S61, it is confirmed whether or not the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disc 13. If the address area B1 (target position) is not reached, step S61 is further continued. If the address area B1 (target position) is reached, the process proceeds to the next step S62.
[0097]
Next, in step S62, the second information signal B sent from the AV-ENDEC 20 side at the transfer rate Rb is temporarily transferred to the second area 19b of the track buffer memory 19 at the transfer rate Rb until reaching the FULL value. Remembered.
[0098]
Next, in step S63, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, the process proceeds to step S62. On the other hand, if the FULL value is reached, the process proceeds to the next step S64.
[0099]
Next, in step S64, when the second information signal B reaches the FULL value, the second information signal B is read out to the optical pickup 14 side at a constant transfer rate Rp. Therefore, as shown in FIG. And the EMPTY value, the second information signal B decreases at a slope of the difference (Rp−Rb), while the second information signal B is reduced by the optical pickup 14 at a constant transfer rate Rp. Recorded in the area 13b.
[0100]
Next, in step S65, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, step S64 is executed. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S66.
[0101]
Next, in step S66, since the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value, the optical pickup 14 moves the second area 13b on the optical disc 13 to the second area 13b. Recording in the address area B1 is stopped. Here, since the recording of the second information signal B is stopped, the second information signal B is continuously sent from the AV-ENDEC 20 side to the second area 19 b in the track buffer memory 19. As apparent from FIG. 8, the operation may be completed before the period until the FULL value is reached before the second address area B2 is started to be recorded in the second area 13b.
[0102]
Next, in step S67, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 in order to record the first information signal A next. At this time, the seek time Tba for the optical pickup 14 to move from the first address area B1 in the second area 13b on the optical disk 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds.
[0103]
Then, when the optical pickup 14 reaches the second area A2 in the first area 13a on the optical disc 13, the process returns to step S54 and repeats in the same manner, so that the first and second information signals A and B are obtained by the optical pickup 14. Can be alternately and continuously recorded in the order of address areas A1, B1, A2, B2, A3, B3,. At this time, the address information of the first and second information signals A and B recorded in the empty areas in the first and second areas 13a and 13b on the optical disc 13 is recorded in the management area 13c after the recording is completed. .
[0104]
Note that the flow of canceling all recording by the optical pickup 14 may be inquired after step 59 or after step 66, but the operation becomes complicated and is omitted here.
[0105]
Further, in the flow of time division recording of the two information signals A and B described above, the track buffer memory 19 reaches the FULL value from the empty state in the first first cycle, but the EMPTY value in the second and subsequent cycles. Between the FULL values, the first information signal A having the recording capacity Ya and the second information signal B having the recording capacity Yb are stored.
[0106]
In the flow of time division recording of the two information signals A and B described above, in order to maintain continuity at the time division recording between the optical disc 13 and the track buffer memory 19 via one optical pickup 14, first, (Equation 9) or (Equation 19) described above is satisfied, and detailed description thereof is omitted here.
[0107]
<When recording and reproducing two information signals in time division>
FIG. 9 is a diagram schematically showing a mode in which the first and second information signals are recorded and reproduced on an optical disc in a time division manner.
FIG. 10 is a flowchart showing a state in which the first and second information signals are recorded and reproduced on the optical disc in a time-sharing manner.
FIG. 11 is a timing chart showing a state in which the first and second information signals are recorded and reproduced on the optical disc in a time division manner.
[0108]
As shown in FIG. 9, one of the first and second information signals A and B having the first and second transfer rates Ra and Rb is sent to one of the information signals A (B) on the optical disk 13. Area 13a (13b) of the track buffer memory 19 with a constant transfer rate Rp which is reproduced in a time division manner by the optical pickup 14 and faster than the first and second transfer rates Ra and Rb. The other information signal B (A) is read from the other areas 19b, 19a of the track buffer memory 19 by the optical pickup 14 at a constant transfer rate Rp, and the other area 13b (13a) on the optical disk 13 is read. ) In time division.
[0109]
Here, the operation of recording and reproducing the two information signals A and B in a time division manner will be described with reference to FIGS. In FIG. 10, the transfer rates Ra and Rb of the first and second information signals A and B are shown at the same transfer rate for the sake of illustration, but show the same tendency even when they are different. is there.
[0110]
First, in step S71, a recording / reproducing flow is started.
[0111]
Next, in step S72, the optical pickup 14 reproduces the management area 13c on the optical disc 13.
[0112]
Next, in step S73, when the optical pickup 14 reproduces the management area 13c on the optical disc 13, reproduction information and position information relating to the first information signal A recorded in advance from the management area 13c to the first area. And a free area in the second area is searched based on the address information from the management area 13c. Then, after searching for an empty area in the second area on the optical disc 13, can the system controller 22 record the second information signal B in the empty area in the second area on the optical disc 13 in a time division manner? Whether or not is determined by (Equation 9) or (Equation 19) described above, and the result is displayed on the display 25 as previously described with reference to FIG. Proceed to S74.
[0113]
Next, in step S74, it is confirmed whether or not the optical pickup 14 has reached the first address area A1 (target position) in the first area 13a where the optical pickup 14 is to be reproduced on the optical disk 13. If the address area A1 (target position) is not reached, step S74 is further continued. If the address area A1 (target position) is reached, the process proceeds to the next step S75.
[0114]
Next, in step S75, the optical pickup 14 starts reproduction from the first address area A1 in the first area 13a, and the first information signal A is transferred to the first in the track buffer memory 19 at the transfer rate Rp. Is temporarily stored in the area 19a. At this time, the system controller 22 (FIG. 1) constantly monitors the EMPTY value and the FULL value of the first area 19a in the track buffer memory 19, and the first information signal is only in the first cycle. It is stored at the transfer rate Rp until A reaches the EMPTY value.
[0115]
Next, in step S76, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, the process proceeds to step S75. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S77.
[0116]
Next, in step S77, when the first information signal A exceeds the EMPTY value, the first information signal A is read to the AV-ENDEC 20 (FIG. 1) side at the transfer rate Ra, so that as shown in FIG. Between the EMPTY value and the FULL value, the transfer rate Rp at which the first information signal A is written to the first area 19a of the track buffer memory 19 and the first information signal A from the first area 19a to AV− The first information signal A is temporarily stored in the first area 19a while increasing at the gradient of the difference (Rp−Ra) of the transfer rate Ra read to the ENDEC 20 side.
[0117]
Next, in step S78, it is asked whether or not the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, step S77 is performed. On the other hand, if the FULL value is reached, the process proceeds to the next step S79.
[0118]
Next, in step S79, since the first information signal A stored in the first area 19a in the track buffer memory 19 has reached the FULL value, the optical pickup 14 moves the first area 13a on the optical disc 13 to the first area 13a. Among them, the reproduction in the first address area A1 is stopped. Here, after the reproduction of the first information signal A is stopped, the first information signal A stored in the first area 19a in the track buffer memory 19 is transferred to the AV-ENDEC 20 side at the transfer rate Ra. As is apparent from FIG. 11, this read operation may be completed before the period until reaching the EMPTY value is reached before the second address area A2 in the first area 13a starts to be reproduced.
[0119]
Next, in step S80, the optical pickup 14 moves to the first address area B1 in the second area 13b on the optical disc 13 in order to record the second information signal B next. At this time, the seek time Tab for the optical pickup 14 to move from the first address area A1 in the first area 13a on the optical disk 13 to the first address area B1 in the second area 13b is 1.5 at the maximum. Within seconds.
[0120]
Next, in step S81, it is confirmed whether or not the optical pickup 14 has reached the address area B1 (target position) of the second area 13b on the optical disc 13. If the address area B1 (target position) has not been reached, step S81 is continued. If the address area B1 (target position) has been reached, the process proceeds to the next step S82.
[0121]
Next, in step S82, the second information signal B sent from the AV-ENDEC 20 side at the transfer rate Rb is temporarily transferred to the second area 19b of the track buffer memory 19 at the transfer rate Rb until reaching the FULL value. Remembered.
[0122]
Next, in step S83, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the FULL value. If the FULL value has not been reached, the process proceeds to step S82. On the other hand, if the FULL value is reached, the process proceeds to the next step S84.
[0123]
Next, in step S84, when the second information signal B reaches the FULL value, the second information signal B is read out to the optical pickup 14 side at a constant transfer rate Rp. Therefore, as shown in FIG. And the EMPTY value, the second information signal B decreases at a slope of the difference (Rp−Rb), while the second information signal B is reduced by the optical pickup 14 at a constant transfer rate Rp. Recorded in the area 13b.
[0124]
Next, in step S85, it is asked whether or not the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value. If the EMPTY value has not been reached, step S84 is executed. On the other hand, if the EMPTY value is reached, the process proceeds to the next step S86.
[0125]
Next, in step S86, since the second information signal B stored in the second area 19b in the track buffer memory 19 has reached the EMPTY value, the optical pickup 14 moves the second area 13b on the optical disc 13 to the second area 13b. Recording in the address area B1 is stopped. Here, since the recording of the second information signal B is stopped, the second information signal B is continuously sent from the AV-ENDEC 20 side to the second area 19 b in the track buffer memory 19. As is clear from FIG. 11, the operation may be completed before the period until the FULL value is reached before the second address area B2 starts to be recorded in the second area 13b.
[0126]
Next, in step S87, the optical pickup 14 moves to the second address area A2 in the first area 13a on the optical disc 13 in order to reproduce the first information signal A next. At this time, the seek time Tba for the optical pickup 14 to move from the first address area B1 in the second area 13b on the optical disk 13 to the second address area A2 in the first area 13a is 1.5 at the maximum. Within seconds.
[0127]
Then, when the optical pickup 14 reaches the second area A2 in the first area 13a on the optical disc 13, the process returns to step S74 and repeats in the same manner, so that the first and second information signals A and B are obtained by the optical pickup 14. Can be recorded and reproduced alternately in time division in the order of address areas A1, B1, A2, B2, A3, B3,. At this time, the address information of the second information signal B recorded in the empty area in the second area 13b on the optical disc 13 is recorded in the management area 13c after the recording is completed.
[0128]
The flow for stopping all recording and reproduction by the optical pickup 14 may be inquired after step 79 or after step 86, but the operation becomes complicated, and is therefore omitted here.
[0129]
In the time division recording / reproducing flow of the two information signals described above, the second area 19b of the track buffer memory 19 reaches the FULL value from the empty state in the first first cycle. Then, the second information signal B having the recording capacity Yb is stored between the EMPTY value and the FULL value.
[0130]
In the flow of time division recording / reproduction of the two information signals A and B described above, in order to maintain continuity during time division recording / reproduction between the optical disc 13 and the track buffer memory 19 via one optical pickup 14. , Which satisfies (Equation 9) or (Equation 19) described above, will not be described in detail here.
[0131]
In this embodiment, the description is focused on the optical disk 13. However, the present invention can also be applied to an apparatus that has a plurality of disks and a plurality of heads and performs recording and reproduction alternately, such as a magnetic disk apparatus. In addition, although the disk is assumed to be a spiral continuous track, the present invention can also be applied to a case of a plurality of concentric tracks like a magnetic disk device. In this case, a track kick operation is performed in continuous recording and reproduction, but this operation can be similarly applied if considered as a seek time. Further, the recording / reproducing procedure and the contents of display are merely examples, and are not limited to this range.
[0132]
Further, here, the information signal transfer rate is described mainly with respect to continuous information signals such as video and audio, but computer data that does not make sense unless processed within a predetermined time, It belongs to continuous data and generally includes a variable transfer rate and a fixed transfer rate that change every moment on the time axis depending on image quality.
[0133]
【The invention's effect】
    As described in detail above, the present inventionAccording toTwo information signals are recorded on the information signal recording medium with good continuity during time division recording.Or recording and playbackit can.
[0135]
  MoreYuThe user can easily use the system, and the user can set the transfer rate of the recorded information signal to a desired value.
[Brief description of the drawings]
FIG. 1 is a block diagram for explaining an overall configuration of an information signal recording / reproducing apparatus according to the present invention.
In the information signal recording / reproducing apparatus according to the present invention, the first and second areas between the first and second areas on the optical disc and the first and second areas in the track buffer memory are shown. FIG. 6 is a diagram schematically showing a state in which the information signal is recorded or recorded / reproduced in a time-sharing manner by one optical pickup.
FIG. 3 is a diagram showing addresses of first and second areas (data areas) and addresses of management areas on an optical disc.
FIG. 4 is a diagram showing a state in which a state of an empty area on an optical disc is displayed on a display when one information signal is recorded on the optical disc.
FIGS. 5A and 5B are views showing a state in which two information signals are recorded on an optical disc in a time-sharing manner or when a free space state on the optical disc is displayed on a display when the information signal is recorded or reproduced. is there.
FIG. 6 is a diagram schematically showing a mode in which first and second information signals are recorded on an optical disc in a time-sharing manner.
FIG. 7 is a flowchart showing a state in which first and second information signals are recorded on an optical disc in a time-sharing manner.
FIG. 8 is a timing chart showing a state in which the first and second information signals are recorded on the optical disc in a time-sharing manner.
FIG. 9 is a diagram schematically showing a mode in which the first and second information signals are recorded and reproduced on an optical disc in a time-sharing manner.
FIG. 10 is a flowchart showing a state in which the first and second information signals are recorded and reproduced on an optical disc in a time-sharing manner.
FIG. 11 is a timing chart showing a state in which the first and second information signals are recorded and reproduced on an optical disc in a time-sharing manner.
[Explanation of symbols]
10 Information signal recording / reproducing apparatus,
13: Information signal recording medium (optical disc),
13a ... 1st area | region, 13b ... 1st area | region, 13c ... management area | region,
14 ... Head (optical pickup),
19: Track buffer memory,
19a: first buffer memory (first area),
19b ... second buffer memory (second area),
20 Audio / video / encoder decoder (AV-ENDEC).

Claims (8)

An information signal recording medium provided with first and second areas for recording first and second information signals respectively, and a management area for recording management information indicating addresses in the first and second areas Means for rotating;
A first, the entered in a second transfer rate first, Luba Ffamemori to temporarily store the second information signal,
Said movably provided with respect to the information signal recording medium, before Symbol said first read by time division from the buffer memory, the second information signal first, fast transfer transmission rate than the second transfer rate And at least one head for time-division recording on the first and second areas on the information signal recording medium,
Absorbing the first by the one head, and the transfer rate to the second information signal, the first previously entered Kiba Ffamemori, the difference between the transfer rate of the second information signal prior fangs Ffamemori An information signal recording / reproducing apparatus configured as described above,
Transfer rates of first and second information signals transferred from the buffer memory to the head ... Rp,
The selected transfer rate Ra for inputting the first information signal to the buffer memory, Ra,
The selected transfer rate... Rb for inputting the second information signal to the buffer memory.
Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
By reproducing the address recorded in the management area on the information signal recording medium in front Kihe head, the first, the first to the second information signal is recorded respectively, each of the second region An information unit amount ... Ya for transferring the first information signal from the buffer memory to the head by searching for an empty area, and an information unit amount for transferring the second information signal from the buffer memory to the head ... Yb But,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
And determining means for determining whether or not the first and second information signals can be recorded in the respective empty areas in the first and second areas in a state where the relational expression is satisfied. Information signal recording / reproducing apparatus. As information signal recording media, there are provided first and second areas for recording first and second information signals, respectively, and a management area for recording management information indicating addresses in the first and second areas. Applied information signal recording media,
A buffer memory for temporarily storing the first and second information signals input at the first and second transfer rates; and a time division from the buffer memory provided to be movable with respect to the information signal recording medium The first and second information signals read out in this manner are recorded in a time division manner in the first and second areas on the information signal recording medium at a transfer rate faster than the first and second transfer rates. The difference between the transfer rate of the first and second information signals by the one head and the transfer rate of the first and second information signals input to the buffer memory is determined using at least one head. An information signal recording / reproducing method absorbed by a memory ,
Transfer rate ... Rp of the first, second information signal to be transferred from the buffer memory to the head,
The selected transfer rate ... Ra inputting the first information signal to said buffer memory,
The selected transfer rate ... Rb inputting the second information signal to said buffer memory,
During time before Kihe head is that takes to move to the first position or al a second location on said information signal recording medium ... Tab,
Before when Kihe head has a while ... Tba time that takes to move to the second position or et first position on said information signal recording medium,
By reproducing the address recorded in the management area on the information signal recording medium in front Kihe head, the first, the first to the second information signal is recorded respectively, each of the second region An information unit amount ... Ya for transferring the first information signal from the buffer memory to the head by searching for an empty area, and an information unit amount for transferring the second information signal from the buffer memory to the head ... Yb But,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
The first in the state that satisfies the relational expression, the second information signal first, and having a determining step of judgment whether it is possible to record in each free space in the second region Information signal recording / reproducing method. A first area in which one of the first and second information signals is recorded in advance, a second area in which the other information signal is recorded, and addresses in the first and second areas Means for rotating an information signal recording medium provided with a management area for recording management information indicating
A buffer that temporarily stores one information signal reproduced from the information signal recording medium and outputs the information signal at a first transfer rate, and temporarily stores the other information signal input at a second transfer rate Memory,
An operation that is movably provided with respect to the information signal recording medium, and that transfers one information signal reproduced from the information signal recording medium to the buffer memory at a transfer rate faster than the first and second transfer rates; And at least one head for performing time division on the operation of recording the other information signal input to the buffer memory on the information signal recording medium at the transfer rate,
The buffer memory absorbs the difference between the transfer rate of the head to the first and second information signals and the transfer rate of the first and second information signals input and output from the buffer memory. An information signal recording / reproducing apparatus ,
Before Kihe Tsu first that will be input to and output from the buffer memory Ri by the soil, the second of the information signal of the transfer rate ... Rp,
Said first, said selected transfer rate information signals towards the recording of the second information signal is input to the buffer memory ... Ra,
Said first transfer rate ... Rb of the information signal of better to reproduction of the second information signal outputted from said buffer memory,
Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
Said address said head recorded when the time ... Tba it takes to move from the second position to the first position on said information signal recording medium, in the management area on the information signal recording medium by said one head playing a searches the free space before Symbol second region that records the other information signal, the information unit quantity for transferring information signals towards the said recording from the buffer memory to the head ... Ya and the information unit amount to transfer the information signal to be reproduced from the head to the buffer memory ... Yb,
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
Recordable whether the information signal is characterized by having a determining means for judgment records second information signal pre SL in a state that satisfies the relational expression free space before Symbol second region Playback device. As an information signal recording medium, a first area in which one of the first and second information signals is recorded in advance, a second area in which the other information signal is recorded, and the first and first information signals are recorded. An information signal recording medium provided with a management area for recording management information indicating an address in the area 2 ;
Temporarily storing one of the information signal reproduced from said information signal recording medium, and outputting at a first transfer rate, it temporarily storing said other information signal input at the second transfer rate and Ba Ffamemori, the information signal movably provided with respect to the recording medium, before Symbol information signal wherein one of the information signal reproduced from the recording medium first, before Symbol fast transfer transmission rate than the second transfer rate using operation and to be transferred to the server Ffamemori, and one of the head and the other information signal input before Kiba Ffamemori before Kiten feed rate performed by time division operation and to be recorded on the information signal recording medium at least, before Kihe Tsu first by de, the transfer rate to the second information signal, the input and output from the pre-Symbol buffer memory first, absorbing the difference between the transfer rate of the second information signal in the buffer memory I will do it An information signal recording and reproducing method, the
Transfer rates of first and second information signals input / output to / from the buffer memory by the head... Rp,
The selected transfer rate... Ra, in which the information signal to be recorded of the first and second information signals is input to the buffer memory.
The transfer rate for outputting the information signal to be reproduced from the first and second information signals from the buffer memory ... Rb,
Time required for the head to move from the first position to the second position on the information signal recording medium ... Tab,
When the time required for the head to move from the second position to the first position on the information signal recording medium is Tba,
By reproducing the address recorded in the management area on the information signal recording medium by said one head, and searches for a free region of the second region for recording the other information signals, better to the recording The information unit amount... Ya for transferring the information signal from the buffer memory to the head and the information unit amount Yb for transferring the information signal to be reproduced from the head to the buffer memory.
(Ya + Yb) ≧ Rp × (Ra + Rb) × (Tab + Tba) / (Rp−Ra−Rb)
Ya ≧ Rp × Ra × (Tab + Tba) / (Rp−Ra−Rb)
Yb ≧ Rp × Rb × (Tab + Tba) / (Rp−Ra−Rb)
An information signal recording / reproducing method comprising: a step of determining whether or not the second information signal can be recorded in an empty area in the second area in a state where the relational expression (2) is satisfied . 4. The information signal recording / reproducing apparatus according to claim 1 , wherein the recordable state of the empty area determined by the determining means is displayed . 5. The information signal recording / reproducing method according to claim 2 , further comprising a step of displaying a recordable state of the empty area determined by the determining step . 4. The information signal recording / reproducing apparatus according to claim 1 , wherein when the recordable state of the free area determined by the determining unit is displayed, the information in the recordable free area with respect to the capacity in the total free area is displayed . An information signal recording / reproducing apparatus for displaying a recording efficiency by calculating a capacity ratio . 5. The information signal recording / reproducing method according to claim 2 , wherein when the recordable state of the free area determined by the determining step is displayed, the free space in the recordable free area with respect to the capacity in the total free area is displayed. information signal recording and reproducing method characterized by comprising the step of displaying a recordable efficiency by calculating the ratio of the capacity.

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