JP2015065666A - 独立してクロックされる複数のデジタルデータプロセシングデバイスの間で動作を同期させるためのシステムおよび方法 - Google Patents
独立してクロックされる複数のデジタルデータプロセシングデバイスの間で動作を同期させるためのシステムおよび方法 Download PDFInfo
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Abstract
Description
(a)ストリーミングオーディオ情報のソースの識別情報、
(b)ゾーンプレーヤー11(n)が現在形成しつつあるフレームに関連付けられたタイムスタンプ、
(c)同期グループ20をなすマスターデバイス21およびスレーブデバイス22(g)として動作するゾーンプレーヤーの識別情報。
ゾーンプレーヤー11(n')は、ゾーンプレーヤー11(n)から前記情報を受け取ったのち、ゾーンプレーヤー11(n)によって同定されたストリーミングオーディオ情報ソースからストリーミングオーディオの受信を開始し、該ストリーミングオーディオ情報をフレームに構成し、各フレームをタイムスタンプに関連付け、結果として得られるオーディオおよび再生タイミング情報をネットワーク12を通じて送信する。ゾーンプレーヤー11(n')は上述したのと同じ仕方でこれらの動作を実行することになる。ただし、フレームのためのタイムスタンプを生成する際に、そのデジタル‐アナログコンバータクロック34によって示される時刻を直接使うのではなく、初期タイムスタンプはゾーンプレーヤー11(n)によって提供されるタイムスタンプの値(上の項目(b)参照)に関係付けられ、タイムスタンプがインクリメントされるレートはその(すなわち、ゾーンプレーヤー11(n')の)クロックがインクリメントされるレートに対応する。さらに、ゾーンプレーヤー11(n')は、同期グループ20のマスターデバイス21およびスレーブデバイス22(g)として動作しているゾーンプレーヤーに対して、自らがその同期グループ20のための新しいオーディオ情報チャネルデバイス23であると通知し、オーディオおよび再生タイミング情報をマルチキャストするために使用することになるマルチキャストアドレスを、ユニキャストネットワークアドレスとともに提供する。同期グループ20のメンバーは、ゾーンプレーヤー11(n')からそれがその同期グループ20のための新しいオーディオ情報チャネルデバイス23であることを示す通知を受け取ったのちには、ゾーンプレーヤー11(n)ではなくゾーンプレーヤー11(n')から、ゾーンプレーヤー11(n')によって提供されたマルチキャストアドレスを使ってオーディオおよび再生タイミング情報を受け取ることになる。さらに、そのゾーンプレーヤー11(n')のユニキャストネットワークアドレスを使って現在の時刻情報をそこから取得することもできる。ゾーンプレーヤー11(n')がその現在時刻を決定するのが、ゾーンプレーヤー11(n)によって与えられるタイムスタンプ(上の項目(b)参照)に対して、あるいは先述したようなSNTPプロトコルを使ってゾーンプレーヤー11(n)から受信した現在時刻情報に対してとなることは理解されるであろう。
(d)再生されるべきオーディオ情報を含んでいるオーディオ情報ファイルのリスト、
(e)ゾーンプレーヤー11(n)が現在オーディオおよび再生タイミング情報を提供しているファイルの識別情報ならびにオーディオおよび再生タイミング情報の現在の項目が生成されている当該ファイル中でのオフセットならびにゾーンプレーヤー11(n)がそのフレームと関連付けているタイムスタンプ、
(f)その同期グループ20をなすマスターデバイス21およびスレーブデバイス22(g)として動作しているゾーンプレーヤーの識別情報。
ゾーンプレーヤー11(n')は、ゾーンプレーヤー11(n)から前記情報を受け取ったのち、項目(e)で同定されたファイルから、同定されたオフセット位置から出発してオーディオ情報の取得を開始する。さらに、ゾーンプレーヤー11(n')は取得されたオーディオ情報をフレームに構成し、各フレームをタイムスタンプに関連付け、結果として得られるオーディオおよび再生タイミング情報をネットワーク12を通じて送信する。ゾーンプレーヤー11(n')は上述したのと同じ仕方でこれらの動作を実行する。ただし、フレームのためのタイムスタンプを生成する際に、そのデジタル‐アナログコンバータクロック34によって示される時刻を直接使うのではなく、初期タイムスタンプの値はゾーンプレーヤー11(n)によって提供されるタイムスタンプ(上の項目(e)参照)に関係付けられ、タイムスタンプがインクリメントされるレートはその(すなわち、ゾーンプレーヤー11(n')の)クロックがインクリメントされるレートに一致する。さらに、ゾーンプレーヤー11(n')は、同期グループ20のマスターデバイス21およびスレーブデバイス22(g)として動作しているゾーンプレーヤーに対して、自らがその同期グループ20のための新しいオーディオ情報チャネルデバイス23であると通知し、オーディオおよび再生タイミング情報をマルチキャストするために使用することになるマルチキャストアドレスを、ユニキャストネットワークアドレスとともに提供する。同期グループ20のメンバーは、ゾーンプレーヤー11(n')からそれが当該同期グループ20のための新しいオーディオ情報チャネルデバイス23であることを示す通知を受け取ったのちには、ゾーンプレーヤー11(n)ではなくゾーンプレーヤー11(n')から、ゾーンプレーヤー11(n')によって提供されたマルチキャストアドレスを使ってオーディオおよび再生タイミング情報を受け取ることになる。さらに、そのゾーンプレーヤー11(n')のユニキャストネットワークアドレスを使って現在の時刻情報をそこから取得することもできる。ゾーンプレーヤー11(n')がその現在時刻を決定するのが、ゾーンプレーヤー11(n)によって与えられるタイムスタンプ(上の項目(b)参照)に対して、あるいは先述したようなSNTPプロトコルを使ってゾーンプレーヤー11(n)から受信した現在時刻情報に対してとなることは理解されるであろう。ゾーンプレーヤー11(n')はゾーンプレーヤー11(n)から受け取ったリスト(項目(d)参照)にある一連のオーディオ情報ファイルを処理する。
(i)オーディオおよび再生タイミング情報が、オーディオ情報チャネルデバイス23としてネットワーク12を通じての同期グループのマスターデバイス21および/またはスレーブデバイス22(g)への送信のためにオーディオ情報バッファ31にバッファリングされていたか、あるいは、
(ii)オーディオおよび再生タイミング情報が、同期グループのためのマスターデバイス21かまたは同期グループ内のスレーブデバイスのいずれかとしてのゾーンプレーヤー11(n)によって再生されるべくネットワーク12から受け取られたものか、
に依存する。ゾーンプレーヤー11(n)は自分がメンバーでない同期グループ20(1)(図2A参照)のためのオーディオ情報チャネルデバイス23(1)と、別のゾーンプレーヤー11(n′)がオーディオ情報チャネルデバイス23(1)である別の同期グループ20(2)の一メンバーとの両方として動作しうるので、ネットワーク通信マネージャ40が(i)および(ii)の両方に同時的に携わりうることは理解されるであろう。上記の項(i)を参照すると、送信されるべきパケットが各リングバッファにバッファリングされたのち、ネットワーク通信マネージャ40はそのパケットを取得し、それをメッセージに詰め込み、ネットワークインターフェース41をして該メッセージをネットワーク12を通じて送信できるようにする。制御モジュール42がユーザーインターフェースモジュール13から(マスターデバイス21が同期グループ20のためのオーディオ情報チャネルデバイス23でもある場合)、あるいはマスターデバイスから(マスターデバイス21が当該同期グループ20のためのオーディオ情報チャネルデバイス23でない場合)上述したような「再同期」コマンドの送信を求める制御情報を取得した場合、オーディオ情報チャネルデバイス23の制御モジュール42によってネットワーク通信マネージャ40は前記コマンドをオーディオおよび再生タイミング情報を含んでいるメッセージ中に挿入できるようになる。「再同期」コマンドに関連して実行される動作の詳細はのちに述べる。上述したように、「再同期」コマンドが使われるのは、ユーザーが同期グループに、現在再生されているトラックの再生を打ち切らせるか、あるいはまだ再生が始まっていないトラックの再生を取り消させる場合がある。
(i)現在再生されているトラックの再生を打ち切る再同期コマンドの使用の場合は、オーディオ情報チャネルデバイス23はすぐ再生を始めるよう次のトラックのためのパケットのマルチキャストを開始し、上記した仕方で再生リストを継続し、
(ii)バッファリングは始まっているが再生はこれからであるトラックの再生を取り消す再同期コマンドの使用の場合は、オーディオ情報チャネルデバイス23は、取り消されたトラックの再生が始まることになっていた時刻から再生が始められるよう、取り消されたトラックのあとのトラックのためのパケットのマルチキャストを開始し、上記した仕方で再生リストを継続する。
(b)第二の場合(すぐ上の項(ii))には、再同期コマンドは巡回バッファの書き込みポインタを、再生が取り消されるトラックの最初のパケットを含むエントリーを指すようセットさせる、
ことは理解されるであろう。さらに、バッファリングが始まっていないトラックが取り消される場合には、再同期コマンドは一般に必要ない。同期グループ20のためのオーディオ情報チャネルデバイス23は再生リストからそのトラックを消去するだけでよいからである。
パケットシーケンスA
(A1.0)[パケット57]
(A1.1) [フレーム99の続き]
(A1.2) [フレーム100、時刻=0:00:01、種別=mp3オーディオ]
(A1.3) [フレーム101、時刻=0:00:02、種別=mp3オーディオ]
(A1.4) [フレーム102、時刻=0:00:03、種別=mp3オーディオ]
(A2.0)[パケット58]
(A2.1) [フレーム102の続き]
(A2.2) [フレーム103、時刻=0:00:04、種別=mp3オーディオ]
(A2.3) [フレーム104、時刻=0:00:05、種別=mp3オーディオ]
(A2.4) [フレーム105、時刻=0:00:06、種別=mp3オーディオ]
(A3.0)[パケット59]
(A3.1) [フレーム105の続き]
(A3.2) [フレーム106、時刻=0:00:07、種別=mp3オーディオ]
(A3.3) [フレーム107、時刻=0:00:08、種別=mp3オーディオ]
(A3.4) [フレーム108、時刻=0:00:09、種別=mp3オーディオ]
(A4.0)[パケット60]
(A4.1) [フレーム108の続き]
(A4.2) [フレーム109、時刻=0:00:10、種別=mp3オーディオ]
(A4.3) [再同期コマンド]
(A4.4) [必要ならパディング]
(A5.0)[パケット61]
(A5.1) [フレーム1、時刻=0:00:07、種別=mp3オーディオ]
(A5.2) [フレーム2、時刻=0:00:08、種別=mp3オーディオ]
(A5.3) [フレーム3、時刻=0:00:09、種別=mp3オーディオ]
(A5.4) [フレーム4、時刻=0:00:10、種別=mp3オーディオ]
(A6.0)[パケット62]
(A6.1) [フレーム4の続き]
(A6.2) [フレーム5、時刻=0:00:11、種別=mp3オーディオ]
(A6.3) [フレーム6、時刻=0:00:12、種別=mp3オーディオ]
(A6.4) [フレーム7、時刻=0:00:13、種別=mp3オーディオ]
パケットシーケンスAは、パケット57からパケット62によって同定される6つのパケットのシーケンスで、オーディオ情報チャネルデバイス23がそれぞれのメッセージの形で同期グループ20のメンバーにマルチキャストするものである。オーディオ情報チャネルデバイス23が同期グループ20にマルチキャストしうる一連のメッセージにはパケット57より前のメッセージも含まれうるし、またパケット62よりあとのメッセージも含まれうることは理解されるであろう。各パケットはパケットヘッダを有しており、それはパケットシーケンスAでは行(A1.0)、(A2.0)、・・・(A6.0)によって表されている。各パケットはまた一般には、フレームの少なくとも一部分に対応する情報を含む。パケットシーケンスA内で示されているパケットでは、各パケットは複数のフレームに対応する情報を含んでいる。パケットの長さに依存して、各パケットはフレームの一部分、一フレーム全体または複数フレームに対応する情報を含みうる。パケットシーケンスAによって示されている例示では、各パケットは複数フレームに対応する情報を含みうるものとしている。さらに、パケットは必ずしも整数個のフレームに対応する情報を含むとは限らないものとしている。その場合、あるフレームの一部分に対応する情報がパケットに含まれることがあり、フレームの残りに対応する情報は次のパケットに含まれることになる。
上述したように、オーディオ情報チャネルデバイス23は、マスターデバイス21からしかるべき通知を受け取ったときに、再同期コマンドを含むパケットを含むメッセージをマルチキャストする。パケットシーケンスAに示した例では、前記パケットは、オーディオ情報チャネルデバイスのデジタル‐アナログコンバータクロック時刻が「0:00:07」に対応するときにマルチキャストされる。その後、二つのことが起こる。一方では、マスターデバイス21およびスレーブデバイス22(g)は、前記再同期コマンドを含むパケットを受け取ったときに再生中のオーディオ番組の再生を停止する。
パケットシーケンスB
(B1.0)[パケット157]
(B1.1) [フレーム99の続き]
(B1.2) [フレーム100、時刻=0:00:01、種別=mp3オーディオ]
(B1.3) [フレーム101、時刻=0:00:02、種別=mp3オーディオ]
(B1.4) [フレーム102、時刻=0:00:03、種別=mp3オーディオ]
(B2.0)[パケット158]
(B2.1) [フレーム102の続き]
(B2.2) [フレーム103、時刻=0:00:04、種別=mp3オーディオ]
(B2.3) [フレーム104、時刻=0:00:05、種別=mp3オーディオ]
(B2.4) [フレーム105、時刻=0:00:06、種別=mp3オーディオ]
(B3.0)[パケット159]
(B3.1) [フレーム105の続き]
(B3.2) [フレーム106、時刻=0:00:07、種別=mp3オーディオ]
(B3.3) [トラック境界通知]
(B3.4) [必要ならパディング]
(B4.0)[パケット160]
(B4.1) [フレーム1、時刻=0:00:08、種別=mp3オーディオ]
(B4.2) [フレーム2、時刻=0:00:09、種別=mp3オーディオ]
(B4.3) [フレーム3、時刻=0:00:10、種別=mp3オーディオ]
(B5.0)[パケット161]
(B5.1) [フレーム3の続き]
(B5.2) [フレーム4、時刻=0:00:11、種別=mp3オーディオ]
(B5.3) [再同期、パケット159後]
(B5.4) [必要ならパディング]
(B6.0)[パケット162]
(B6.1) [フレーム1、時刻=0:00:08、種別=mp3オーディオ]
(B6.2) [フレーム2、時刻=0:00:09、種別=mp3オーディオ]
(B6.3) [フレーム3、時刻=0:00:10、種別=mp3オーディオ]
(B6.4) [フレーム4、時刻=0:00:11、種別=mp3オーディオ]
(B7.0)[パケット163]
(B7.1) [フレーム4の続き]
(B7.2) [フレーム5、時刻=0:00:12、種別=mp3オーディオ]
(B7.3) [フレーム6、時刻=0:00:13、種別=mp3オーディオ]
(B7.4) [フレーム7、時刻=0:00:14、種別=mp3オーディオ]
パケットシーケンスBは、パケット157からパケット163によって同定される7つのパケットのシーケンスで、オーディオ情報チャネルデバイス23が同期グループ20のメンバーにマルチキャストするものである。パケットシーケンスAの場合と同様、オーディオ情報チャネルデバイス23が同期グループ20にマルチキャストしうる一連のパケットにはパケット157より前のパケットも含まれうるし、またパケット162よりあとのパケットも含まれうることは理解されるであろう。各パケットはパケットヘッダを有しており、それはパケットシーケンスBでは行(B1.0)、(B2.0)、・・・(A7.0)によって表されている。パケットシーケンスAの場合と同様、各パケットはまた一般には、付随するヘッダ55(f)とともにフレーム51(f)の少なくとも一部分に対応する情報を含む。パケットシーケンスA内で示されているパケットと同様に、各パケットは複数のフレームに対応する情報を含んでいる。パケットの長さに依存して、各パケットはフレームの一部分、一フレーム全体または複数フレームに対応する情報を含みうる。さらに、パケットシーケンスAの場合と同様、各パケットは複数フレームに対応する情報を含みうるものとしている。さらに、パケットは必ずしも整数個のフレームに対応する情報を含むとは限らないものとしている。その場合、あるフレームの一部分に対応する情報がパケットに含まれることがあり、フレームの残りに対応する情報は次のパケットに含まれることになる。
Claims (21)
- オーディオ再生デバイスであって、
第1オーディオ情報を含む第1オーディオ信号を、オーディオ再生デバイスに直接接続されたオーディオ情報ソースから受信するように構成されたオーディオ情報ソースインターフェース、
第2オーディオ情報を含むパケットを、ネットワークオーディオ情報ソースから受信するように構成されたネットワークインターフェース、
を備え、
前記再生デバイスは、前記第1オーディオ信号を再生し、前記第1オーディオ信号の再生中に1つ以上のコマンドを受信し、受信した1つ以上のコマンドに応答して、(i)前記第1オーディオ信号の再生を終了し、(ii)前記第2オーディオ情報に基づいて第2オーディオ信号を生成し、(iii)前記第2オーディオ信号を再生し、
更に、前記再生デバイスは、前記第2オーディオ信号の再生中に前記ネットワークインターフェースを介してネットワーク上に前記第1オーディオ情報を送信するように構成される、ここで前記ネットワークは、ローカルエリアネットワーク(LAN)又はワイドエリアネットワーク(WAN)の一つである、オーディオ再生デバイス。 - 前記第2オーディオ情報は、オーディオファイル又はパケット化されたストリーミングオーディオ情報を含む、請求項1に記載のオーディオ再生デバイス。
- 更に、前記オーディオ再生デバイスは、前記第1オーディオ情報を含むパケットを生成するように構成され、前記第1オーディオ情報の送信は、前記第1オーディオ情報を含むパケットを送信することを含む、請求項1に記載のオーディオ再生デバイス。
- 更に、前記ネットワークインターフェースは、再生タイミング情報を含むパケットを受信するように構成され、
更に、前記再生デバイスは、前記再生タイミング情報とデジタル−アナログコンバータ(DAC)クロックとの間の時間差を決定するように構成された制御モジュールを備える、
請求項1に記載の再生デバイス。 - 更に、前記制御モジュールは、前記再生タイミング情報を更新するために、前記時間差を使用し、前記更新された再生タイミング情報を前記DACに提供するように構成された、請求項4に記載のオーディオ再生デバイス。
- 前記第2オーディオ情報と前記再生タイミング情報とを含むパケットは、マルチキャストアドレスを使用して受信される、請求項4に記載のオーディオ再生デバイス。
- 前記第2オーディオ情報と前記再生タイミング情報とを含むパケットは、ユニキャストアドレスを使用して受信される、請求項4に記載のオーディオ再生デバイス。
- 第1オーディオ再生デバイスで、直接接続されたオーディオ情報ソースから第1オーディオ情報を含む第1オーディオ信号を受信するステップ、
第1オーディオ再生デバイスで、前記第1オーディオ信号を再生するステップ、
第1オーディオ再生デバイスで、ネットワークインターフェースを介してネットワークオーディオ情報ソースから第2オーディオ情報を受信するステップ、
第1オーディオ再生デバイスで、前記ネットワークインターフェースを介して1つ以上の再生制御コマンドを受信するステップ、
受信した1つ以上の再生制御コマンドに応答して、(i)第1オーディオ再生デバイスで、前記第1オーディオ信号の再生を終了し、(ii)第1オーディオ再生デバイスで、第2オーディオ情報に基づいて第2オーディオ信号を生成し、(iii)第1オーディオ再生デバイスで、前記第2オーディオ信号を再生するステップ、
前記第2オーディオ信号の再生中に、前記ネットワークインターフェースを介して第1オーディオ再生デバイスからネットワーク上に前記第1オーディオ情報を送信するステップ、ここで前記ネットワークは、ローカルエリアネットワーク(LAN)又はワイドエリアネットワーク(WAN)の一つである、
を含む、方法。 - 前記第2オーディオ情報は、オーディオファイル又はパケット化されたストリーミングオーディオ情報を含む、請求項8に記載の方法。
- 更に、
前記第1オーディオ情報を含むパケットを生成するステップ、ここで前記第1オーディオ情報を送信するステップは、前記第1オーディオ情報を含むパケットを送信することを含む、請求項8に記載の方法。 - 更に、
前記ネットワークインターフェースを介して、再生タイミング情報を受信するステップ、
前記再生タイミング情報とデジタル−アナログコンバータ(DAC)クロックとの間の時間差を決定するステップ、
を含む、請求項8に記載の方法。 - 更に、
前記再生タイミング情報を更新するために前記時間差を使用するステップ、
更新された再生タイミング情報を前記DACに提供するステップ、
を含む、請求項11に記載の方法。 - 前記第2オーディオ情報と前記再生タイミング情報とを含むパケットは、マルチキャストアドレスを使用して受信される、請求項11に記載の方法。
- 前記第2オーディオ情報と前記再生タイミング情報とを含むパケットは、ユニキャストアドレスを使用して受信される、請求項11に記載の方法。
- 命令が記憶された有形の非一時的なコンピュータ読み取り可能な記録媒体であって、
前記命令が実行されると、再生デバイスに、
第1オーディオ情報を含む第1オーディオ信号を、オーディオ再生デバイスに直接接続されたオーディオ情報ソースから受信させ、
前記第1オーディオ信号を再生させ、
ネットワークインターフェースを介して、ネットワークオーディオ情報ソースから第2オーディオ情報を受信させ、
前記ネットワークインターフェースを介して、1つ以上のコマンドを受信させ、
受信した1つ以上のコマンドに応答して、(i)前記第1オーディオ信号の再生を終了させ、(ii)前記第2オーディオ情報に基づいて第2オーディオ信号を生成させ、(iii)前記第2オーディオ信号を再生させ、
前記第2オーディオ信号の再生中に、前記ネットワークインターフェースを介して第1オーディオ再生デバイスからネットワーク上に前記第1オーディオ情報を送信させる、ここで前記ネットワークは、ローカルエリアネットワーク(LAN)又はワイドエリアネットワーク(WAN)の一つである、
コンピュータ読み取り可能な記録媒体。 - 前記第2オーディオ情報は、オーディオファイル又はパケット化されたストリーミングオーディオ情報を含む、請求項15に記載のコンピュータ読み取り可能な記録媒体。
- 更に、前記記憶された命令は、前記再生デバイスに、
第1オーディオ情報を含むパケットを生成させる、ここで前記第1オーディオ情報を送信させることは、前記第1オーディオ情報を含むパケットを送信させることを含む、請求項15に記載のコンピュータ読み取り可能な記録媒体。 - 前記1つ以上のコマンドは、ユーザインターフェースモジュールから受信される、請求項15に記載のコンピュータ読み取り可能な記録媒体。
- 更に、前記記憶された命令は、前記オーディオ再生デバイスに、
オーディオ情報バッファ内の前記第1オーディオ情報又は前記第2オーディオ情報の少なくとも1つを記憶させる、請求項15に記載のコンピュータ読み取り可能な記録媒体。 - 更に、前記命令が実行されると、前記再生デバイスに、
前記ネットワークインターフェースを介して再生タイミング情報を受信させる、ここで前記第2オーディオ情報と再生タイミング情報とを含むパケットは、ユニキャストアドレス又はマルチキャストアドレスのいずれかを使用して受信される、請求項19に記載のコンピュータ読み取り可能な記録媒体。 - 図1に示す装置。
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