JP4758060B2 - 迅速なデジタル・チャンネル変更 - Google Patents
迅速なデジタル・チャンネル変更 Download PDFInfo
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- JP4758060B2 JP4758060B2 JP2003293004A JP2003293004A JP4758060B2 JP 4758060 B2 JP4758060 B2 JP 4758060B2 JP 2003293004 A JP2003293004 A JP 2003293004A JP 2003293004 A JP2003293004 A JP 2003293004A JP 4758060 B2 JP4758060 B2 JP 4758060B2
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Description
同様の/およびまたは対応する態様、特徴、および構成要素には、図面を通じて同じ番号を使用している。
102 ブロードキャスト・センタ
104 ヘッドエンド
106 送信媒体
108 データ・センタ
110 CMTS
110A CMTS
112 ネットワーク
114 ハブ
116 ファイバ回線
118 ファイバ・ノード
120 同軸線路
122 加入者サイト
124 クライアント装置
200 ブロードキャスト・ビデオ配信スペクトル
202 アップストリーム部分
204 ダウンストリーム部分
206 アナログ(ビデオ)部分
208 デジタル・ビデオ(DV)部分
210 オンデマンドDV部分
212 高速データ部分
300 チューニング時間
302 アナログ・チャンネルへのチューニング遅延
304 チャンネル・オーバーヘッド遅延
306 Iフレーム待ち遅延
308 バッファ充足時間遅延
402 ネットワーク・インターフェース
404 ネットワーク
406 ネットワーク・インターフェース
408 サーバ構造
408A サーバ記憶装置
408B サーバ・コンピュータ
410 ブロードキャスト・ビデオ・データ
412 プロセッサ
414 メモリ
416 ビデオ・データ抽出器
418 ビデオ・データ・ディストリビュータ
420 ビデオ・データ・ブースタ
422 チャンネル変更ハンドラ
424 ビデオ・デコーダ
426 バッファ
428 チャンネル変更入力ハンドラ
430 チャンネル変更要求
432 ブロードキャスト・ビデオ・データ
500 データ・ストリーム
502 Iユニット
504 非Iユニット
602 チャンネル要求送信遅延
604 ビデオ・データ取出遅延
606 Iユニット送信遅延
608 バッファ・ブースト充足遅延
700 グラフ
702 ストリーム
704 ストリーム
706 ストリーム
708 ストリーム
710 最大帯域幅
712 一時的な超過帯域幅
714 現在の帯域幅利用率
800 フロー図
802〜820 方法ブロック
Claims (23)
- ビデオ・ブロードキャスト環境においてチャンネルを変更するためのシステムであって、
クライアント装置(124)から新しいチャンネルへのチューニング要求(430)を受信するチャンネル変更要求ハンドラー(422)と、
前記受信した要求に応答して、記憶装置(408A)から前記新しいチャンネルの先行するイントラ・フレーム(502)を探して取り出すブロードキャスト・ビデオ抽出器(416)であって、前記先行するイントラ・フレームは、もし前記要求を受信した時間と最近受信したイントラ・フレームとの間に十分な数の非イントラ・フレームが存在しない場合は、第二番目に最近に受信したイントラ・フレームであり、非イントラ・フレームの前記十分な数は前記クライアント装置(124)のバッファ(426)のサイズに応じて決定される、ブロードキャスト・ビデオ抽出機と、
前記記憶装置にアクセスし、ブロードキャスト・ビデオデータ(410)の前記取り出された先行するイントラ・フレームに続く複数の非イントラ・フレームのビデオデータストリームを取り出すブロードキャスト・ビデオ・ブースタ(420)と、
前記取り出された先行するイントラ・フレームを前記クライアント装置に送信し、前記クライアント装置が前記新しいチャンネルの画像を表示できるようにするビデオデータ・ディストリビュータ(418)であって、他のクライアント装置に割り当てられた帯域幅と、前記他のクライアント装置によって利用される帯域幅との差である一時的な超過帯域幅を使用して、前記取り出された複数の非イントラ・フレームのビデオデータストリームを、前記ブロードキャスト・ビデオのリアルタイムの送信レートを超える送信レートで前記クライアント装置に送信するビデオデータ・ディストリビュータと
を備えることを特徴とするシステム。 - ブロードキャスト・ビデオデータ(410)の前記取り出された先行するイントラ・フレーム(502)は、ブロードキャスト・ビデオデータ(410)の前記最近受信したイントラ・フレームを含むことを特徴とする請求項1に記載のシステム。
- ブロードキャスト・ビデオデータ(410)の前記取り出された先行するイントラ・フレーム(502)は、前記クライアント装置(124)がデコードしてブロードキャスト・ビデオデータ(410)の他のフレームを参照することなく映像を表示できるように完全であることを特徴とする請求項1に記載のシステム。
- ビデオ・ブロードキャスト環境でチャンネル変更を加速するために、
複数のチャンネルのためにブロードキャスト・ビデオデータ(410)を記憶する記憶装置(408A)を有することを特徴とする請求項1に記載のシステム。 - ビデオ・データ・ディストリビュータ(418)はさらに、前記取り出されたブロードキャスト・ビデオデータ・ストリームを受信して、前記取り出されたブロードキャスト・ビデオデータ・ストリームを送信することを特徴とする請求項1に記載のシステム。
- 前記チャンネル変更要求ハンドラ(422)が前記複数のクライアント装置(124)からチャンネル変更要求を受信できるようにするネットワーク・インターフェースであって、前記ビデオ・データ・ディストリビュータ(418)がブロードキャスト・ビデオ・データ(410)の前記取り出されたイントラ・フレーム、およびそれから続くブロードキャスト・ビデオ・データ(410)の前記取り出されたそれぞれのストリームを前記複数のクライアント装置(124)に送信できるようにするネットワーク・インターフェースをさらに備えることを特徴とする請求項1に記載のシステム。
- 前記システムは、前記複数のクライアント装置(124)の個々とのポイント・ツー・ポイント・セッションを個々に確立することを特徴とする請求項1に記載のシステム。
- ブロードキャスト・ビデオ・データ(410)の前記イントラ・フレーム(502)が前記現在のブロードキャスト時刻より前に前記システムに到着したとき、ブロードキャスト・ビデオ・データの前記イントラ・フレームは、前記現在のブロードキャスト時刻より前のものとして取り出されることを特徴とする請求項1に記載のシステム。
- 前記システムはケーブル・ネットワークおよび衛星ネットワークの少なくとも一方のヘッドエンドを備えることを特徴とする請求項1に記載のシステム。
- 前記チャンネル変更要求ハンドラー(422)は、前記クライアント装置(124)から前記チャンネル変更要求を受信するように、またさらに少なくとも前記抽出手段に少なくとも前記要求されたチャンネルを提供するように構成されていることを特徴とする請求項1に記載のシステム。
- 前記チャンネル変更要求は、前記クライアント装置(124)から送信されたデジタル・パケットを備えることを特徴とする請求項10に記載のシステム。
- ネットワークとインターフェースをとり、前記ネットワークを介してパケットを送受信するように構成されているインターフェース手段と、
前記インターフェース手段を使用して、前記ブロードキャスト・ビデオ・データ(410)の前記イントラ・フレーム(502)および前記ストリームを前記クライアント装置(124)に配信する配信手段と
をさらに備えることを特徴とする請求項1に記載のシステム。 - 前記ブロードキャスト・ビデオ・データ(420)の前記ストリームは、少なくとも1つの予測フレームを備えることを特徴とする請求項12に記載のシステム。
- デジタル・ビデオ・ブロードキャスト・ネットワークにおいてチャンネルをチューニングする方法であって、
クライアント装置(124)から要求チャンネルへのチューニング要求を受信するステップと、
前記要求チャンネルのためのブロードキャスト・ビデオの先行するイントラ・フレーム(502)を探すステップと、
前記要求チャンネルのためにブロードキャスト・ビデオの前記先行するイントラ・フレームを取り出すステップであって、前記先行するイントラ・フレームは、もし前記要求を受信した時間と最近受信したイントラ・フレームとの間に十分な数の非イントラ・フレームが存在しない場合は、第二番目に最近に受信したイントラ・フレームであり、非イントラ・フレームの前記十分な数は前記クライアント装置のバッファ(426)のサイズに応じて決定される、ステップと、
ブロードキャスト・ビデオの前記先行するイントラ・フレームを、前記クライアント装置に、前記要求チャンネルの映像の表示を前記クライアント装置ができるように、送信するステップと、
ブロードキャスト・ビデオ・データ(410)の前記イントラ・フレーム(502)に続くブロードキャスト・ビデオ・データ・ストリームで、前記クライアント装置のデコーディング・バッファを満たすのに十分なサイズのブロードキャスト・ビデオ・データ・ストリームを、取り出すステップと、
他のクライアント装置に割り当てられた帯域幅と、前記他のクライアント装置によって利用される帯域幅との差である一時的な超過帯域幅を使用して、前記クライアント装置にブロードキャスト・ビデオ・データの前記イントラ・フレームに続く前記ブロードキャスト・ビデオ・データ・ストリームを、前記ブロードキャスト・ビデオ・データのリアルタイムの送信レートを超える送信レートで送信するステップと、
を含む方法。 - 請求項14に記載の方法において、ビデオ・ブロードキャスト環境においてチャンネル変更を速める方法であって、
要求されたチャンネルへの変更を命令するユーザからのチャンネル変更入力を、クライアント装置(124)で、受信するステップと、
前記チャンネル変更入力に応答して、前記要求されたチャンネルについての指示を含むチャンネル変更要求を、前記クライアント装置(124)から上流ノードに、送信するステップと、
前記チャンネル変更要求を、前記上流ノードで、受信するステップと、
前記要求されたチャンネルを含む複数のチャンネルの保持されているブロードキャスト・ビデオ・データ(410)を格納するメモリを、前記上流ノードで、アクセスするステップと、
前記保持されているブロードキャスト・ビデオ・データから、現在のブロードキャスト時刻に対して過去のブロードキャスト・ビデオ・データのイントラ・フレームで、前記要求されたチャンネルのブロードキャスト・ビデオ・データ(410)のイントラ・フレーム(502)を、前記上流ノードで、取り出すステップと、
ブロードキャスト・ビデオ・データの前記イントラ・フレームを、前記クライアント装置(124)に、前記上流ストリーム・ノードから送信するステップと、
ブロードキャスト・ビデオ・データの前記イントラ・フレームを、前記クライアント装置(124)で、受信するステップと、
ブロードキャスト・ビデオ・データの前記イントラ・フレームに続く前記ブロードキャスト・ビデオ・データ・ストリームを、前記クライアント装置(124)で、受信するステップと
を備えることを特徴とする方法。 - ブロードキャスト・ビデオ・データの前記イントラ・フレームと、ブロードキャスト・ビデオ・データの前記イントラ・フレームに続く前記ブロードキャストビデオ・データ・ストリームが、前記クライアント装置(124)に関連付けられたスクリーン上に表示されることを前記クライアント装置にさせるステップをさらに備える請求項15に記載の方法。
- 前記上流ノードはヘッドエンドを備え、前記クライアント装置はセットトップボックスを備えることを特徴とする請求項15に記載の方法。
- 前記上流ノードから送信するステップのいずれかより前に、前記取り出すステップの両方が起こることを特徴とする請求項15に記載の方法。
- ブロードキャスト・ビデオ・データの前記イントラ・フレームを前記クライアント装置(124)で受信する前記ステップは、ブロードキャスト・ビデオ・データ(410)の前記イントラ・フレーム(502)に続く前記ブロードキャスト・ビデオ・データ・ストリームを前記上流ノードから前記クライアント装置(124)に送信する前記ステップより前に起こることを特徴とする請求項15に記載の方法。
- 請求項14に記載の方法において、
テレビジョン・ベースの娯楽ネットワークのヘッドエンドの方法であって、
特定のチャンネルのブロードキャスト・ビデオ・データ(410)のストリームを連続的に受信するステップと、
ブロードキャスト・ビデオ・データの前記ストリームを記憶装置(410A)に格納するステップであって、直前に受信されたブロードキャスト・ビデオ・データのイントラ・フレームを含むブロードキャスト・ビデオ・データの前記複数のイントラ・フレーム(502)と、現在のブロードキャスト時刻に対応するブロードキャスト・ビデオ・データの非イントラ・フレームを含むブロードキャスト・ビデオ・データの前記複数の非イントラ・フレーム(504)を含むブロードキャスト・ビデオ・データの前記ストリームで、前記特定のチャンネルのブロードキャスト・ビデオ・データの前記ストリームを、記憶装置内に格納するステップと、
を備えることを特徴とする方法。 - 前記現在のブロードキャスト時刻に対応するブロードキャスト・ビデオ・データの前記非イントラ・フレーム、および任意の追加の非イントラ・フレーム(504)であって、ブロードキャスト・ビデオ・データの前記1つまたは複数の非イントラ・フレームのブロードキャスト・ビデオ・データの最後の非イントラ・フレームと、前記現在のブロードキャスト時刻に対応するブロードキャスト・ビデオ・データの前記非イントラ・フレームとの間にあるブロードキャスト・ビデオ・データの任意の追加の非イントラ・フレームを送信するステップをさらに備えることを特徴とする請求項20に記載の方法。
- ビデオ・ブロードキャスト環境においてチャンネル変更を速めることが可能なヘッドエンドであって、前記ヘッドエンドは請求項14に記載の方法を実施するように構成されていて、さらに、
前記ヘッドエンドからブロードキャスト・ビデオ・データの前記イントラ・フレームを送信すること、および
前記ヘッドエンドからブロードキャスト・ビデオ・データの前記イントラ・フレームに続く前記ブロードキャスト・ビデオ・データを送信すること
を実行するように構成されていることを特徴とするヘッドエンド。 - ブロードキャスト・ビデオ・データの前記イントラ・フレームは、MPEG(Moving Pictures Expert Group)準拠の方式によるブロードキャスト・ビデオ・データのイントラ・フレームを備えることを特徴とする請求項22に記載のヘッドエンド。
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EP1389874A3 (en) | 2004-03-17 |
EP1389874B1 (en) | 2018-08-22 |
CN1484450A (zh) | 2004-03-24 |
CN100466715C (zh) | 2009-03-04 |
MXPA03006913A (es) | 2004-02-19 |
JP2004080785A (ja) | 2004-03-11 |
US8397269B2 (en) | 2013-03-12 |
EP1389874A2 (en) | 2004-02-18 |
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