JP6945590B2 - 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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- JP6945590B2 JP6945590B2 JP2019104398A JP2019104398A JP6945590B2 JP 6945590 B2 JP6945590 B2 JP 6945590B2 JP 2019104398 A JP2019104398 A JP 2019104398A JP 2019104398 A JP2019104398 A JP 2019104398A JP 6945590 B2 JP6945590 B2 JP 6945590B2
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- H04R2227/00—Details of public address [PA] systems covered by H04R27/00 but not provided for in any of its subgroups
- H04R2227/005—Audio distribution systems for home, i.e. multi-room use
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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 (20)
- コンピュータのための方法であって、
コンピュータがどの同期グループに対してもオーディオ情報チャネルデバイスとして機能していない第1モードで動作するステップ、
コンピュータが所与の同期グループのためのオーディオ情報チャネルデバイスとして機能し始めるという指示を受信するステップ、ここで所与の同期グループは、ローカルエリアネットワーク(LAN)上でコンピュータと通信可能に接続される、少なくとも第1ゾーンプレーヤー及び第2ゾーンプレーヤーを含み、又、コンピュータ、第1ゾーンプレーヤー及び第2ゾーンプレーヤーは、それぞれ、異なるクロックタイムを有する、
指示を受信した後、第1モードから第2モードに移行するステップ、ここで第2モードにおいては、コンピュータが所与の同期グループのためのオーディオ情報チャネルデバイスとして機能するように構成される、
第2モードで動作している間、
LAN上で第1ゾーンプレーヤーと第2ゾーンプレーヤーとのうち少なくとも1つにコンピュータのクロックタイミング情報を送信するステップ、ここでコンピュータのクロックタイミング情報は、コンピュータのクロックタイムの少なくとも1つの読み取り値を含み、又、コンピュータのクロックタイミング情報は、(i)第1ゾーンプレーヤーが、第1ゾーンプレーヤーのクロックタイムとコンピュータのクロックタイムとの間の時間差を決定すること、(ii)第2ゾーンプレーヤーが、第2ゾーンプレーヤーのクロックタイムとコンピュータのクロックタイムとの間の時間差を決定すること、のうち少なくとも1つを可能にする、
所与の同期グループによって再生される所与のオーディオコンテンツを取得するステップ、
所与のオーディオコンテンツに関連し、タイムスタンプを含む再生タイミング情報を生成するステップ、ここで再生タイミング情報は、第1ゾーンプレーヤー及び第2ゾーンプレーヤーが所与のオーディオコンテンツの同期再生を開始することを示す、コンピュータのクロックタイムに関連する第1フューチャータイムのインジケータを含む、
再生タイミング情報と、所与のオーディオコンテンツを示すオーディオ情報とを、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに送信するステップ、
第1ゾーンプレーヤー及び第2ゾーンプレーヤーが、決定した時間差に基づいて再生タイミング情報のタイムスタンプを更新することを可能にされて、所与のオーディオコンテンツを同期して再生するステップ、
を含む、方法。 - 第1モードの間、コンピュータは、オーディオコンテンツを再生するように構成された再生デバイスとして動作する、請求項1に記載の方法。
- コンピュータが所与の同期グループのためのオーディオ情報チャネルデバイスとして機能し始めるという指示を受信するステップは、
(a)制御デバイス、(b)第1ゾーンプレーヤーと第2ゾーンプレーヤーとのうちのいずれか、又は(c)ユーザから、同期グループのためのオーディオ情報チャネルデバイスとして動作するという要求を受信すること、
を含む、請求項1に記載の方法。 - 所与のオーディオコンテンツを再生するための同期グループに対する要求を受信するステップ、ここで所与のコンテンツは、所与のオーディオコンテンツを再生するための同期グループに対する要求を受信したことに応答して取得される、請求項1に記載の方法。
- LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、オーディオ情報を送信することは、
所与のオーディオコンテンツの同期再生が開始する前に、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、オーディオ情報の第1部分を送信すること、および
所与のオーディオコンテンツの同期再生が開始した後に、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、オーディオ情報の第2部分を送信すること、
を含む、請求項1に記載の方法。 - LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、再生タイミング情報とオーディオ情報とを送信することは、
オーディオ情報とは別の通信で、再生タイミング情報を送信すること、
を含む、請求項1に記載の方法。 - LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、オーディオ情報を送信することは、
一連のフレームを送信すること、ここで個々のフレームは、所与のオーディオコンテンツの一部を示すオーディオ情報を含む、
を含む、請求項1に記載の方法。 - 第1フューチャータイムは、一連のフレーム内の第1フレームに対応する、請求項7に記載の方法。
- 再生タイミング情報は、さらに、一連のフレーム内の第1フレームの後に続く個々のフレームに対して、
後続の個々のフレーム内の所与のオーディオコンテンツの一部が第1ゾーンプレーヤー及び第2ゾーンプレーヤーによって同期して再生されることを示す、コンピュータのクロックタイムに関連する個々のフューチャータイムのインジケータを含む、
請求項8に記載の方法。 - 所与のオーディオコンテンツに関連する再生タイミング情報を生成するステップは、
オーディオ情報の最初の部分を取得することに関連するコンピュータのクロックタイムの読み取り値をキャプチャすること、
キャプチャされたクロックタイムの読み取り値に時間遅延を追加することによって、第1フューチャータイムを算出すること、
第1フューチャータイムを示すタイムスタンプを生成すること、
を含む、請求項1に記載の方法。 - 時間遅延は、オーディオ情報の少なくとも最初の部分がLAN上で受信され、第1ゾーンプレーヤー及び第2ゾーンプレーヤーによって処理されることを可能にするのに十分な時間量を有する、請求項10に記載の方法。
- 時間遅延は、LANの待ち時間の見積もりに基づいて決定される、請求項10に記載の方法。
- 更に、
所与のオーディオコンテンツの再生を終了するための同期グループに対する要求を受信するステップ、
所与のオーディオコンテンツの再生を終了するための同期グループに対する要求を受信することに応答して、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、所与のオーディオコンテンツの再生を終了するコマンドを、送信するステップ、
を含む、請求項1に記載の方法。 - 更に、
所与のオーディオコンテンツの再生を終了するための同期グループに対する要求を受信した時点で、コンピュータが依然として所与のオーディオコンテンツを示すオーディオ情報を、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに送信している場合、所与のオーディオコンテンツの再生を終了するための同期グループに対する要求を受信したことに応答して、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、所与のオーディオコンテンツを示すオーディオ情報の送信を終了すること、
を含む、請求項13に記載の方法。 - 更に、
第1ゾーンプレーヤーと第2ゾーンプレーヤーとが所与のオーディオコンテンツを同期して再生している間、所与のオーディオコンテンツの再生から新しいオーディオコンテンツの再生に切り替えるための同期グループに対する要求を受信するステップ、
所与のオーディオコンテンツの再生から新しいオーディオコンテンツの再生に切り替えるための同期グループに対する要求を受信したことに応答して、
LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに、所与のオーディオコンテンツの再生を終了するコマンドを送信するステップ、
新しいオーディオコンテンツを取得するステップ、
新しいオーディオコンテンツに関連する再生タイミング情報を生成するステップ、ここで再生タイミング情報は、第1ゾーンプレーヤー及び第2ゾーンプレーヤーが新しいオーディオコンテンツの同期再生を開始することを示す、コンピュータのクロックタイムに関連する第2フューチャータイムのインジケータを含む、
新しいオーディオコンテンツに関連する再生タイミング情報と、新しいオーディオコンテンツを示すオーディオ情報とを、LAN上で第1ゾーンプレーヤー及び第2ゾーンプレーヤーに送信するステップ、これにより、第1ゾーンプレーヤー及び第2ゾーンプレーヤーに新しいオーディオコンテンツを同期して再生させる、
を含む、請求項1に記載の方法。 - 所与のオーディオコンテンツの再生を終了するためのコマンドは、第1ゾーンプレーヤー及び第2ゾーンプレーヤーが所与のオーディオコンテンツの同期再生を終了する、コンピュータのクロックタイムに関連するフューチャータイムを含む、請求項15に記載の方法。
- 所与のオーディオコンテンツは、(a)LANとワイドエリアネットワーク(WAN)とのうち一方又は両方を介してコンピュータに通信可能に接続されるネットワークアクセス可能なオーディオソース、(b)コンピュータに直接接続されるローカルオーディオソース、および(c)コンピュータの記憶媒体のうちの1つから取得される、請求項1に記載の方法。
- 更に、
コンピュータが同期グループのためのオーディオ情報チャネルデバイスとして動作している間、
第3ゾーンプレーヤーを含むように同期グループが更新されたという指示を受信するステップ、
指示を受信したことに応答して、更新された同期グループのためのオーディオ情報チャネルデバイスとして動作し始めるステップ、
を含む、請求項1に記載の方法。 - コンピュータに請求項1〜18のいずれか一項に記載の方法を実行させるためのプログラムを記録したコンピュータ読み取り可能な記録媒体。
- 少なくとも1つのデータネットワークとの相互接続を提供するように構成されたネットワークインタフェース、
コンピュータのクロックタイムを提供するように構成されたクロック、
少なくとも1つのプロセッサ、および
請求項19に記載のコンピュータ読み取り可能な記憶媒体、
を備える、コンピュータ。
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