JP2004343569A - Transmitter, radio communication system, acoustic device, acoustic system, transmitting method, radio communication method, channel setting method and sound reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic device, an acoustic system and a voice reproduction system capable of transmitting sound information of a plurality of channels to a speaker by radio and reproducing the sound information. <P>SOLUTION: This acoustic system 1 is provided with a transmitting part 20 consisting of transmitters 21x (x = L, Sl, C, Sr and R) corresponding to five channels, speakers 301 to 305, a radar unit 40 and a system controller 50. The system controller 50 set a channel in charge for each of the speakers 301 to 305 on the basis of angles θ formed by the radar unit 40 and the speakers 301 to 305, and sets timing for each transmitter 21x to emit sound data on the basis of periods T1l and T2l when a radiated pulse signal reaches each of the speakers 301 to 305. The transmitter 21x emits the sound data at the set timing, and each of the speakers 301 and 305 can thereby extract only sound data of the channel in charge from an inputted signal and reproduce the sound data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【数５】

【００２５】
また、上記構成において、前記第１の検出手段は、前記第１のアンテナから電磁波を放射し、該第１のアンテナに入力された電磁波から該電磁波のユーザ及び各スピーカにおける反射波を検出し、
前記第２の検出手段は、前記第２のアンテナから電磁波を放射し、該第２のアンテナに入力された電磁波から該電磁波のユーザ及び各スピーカにおける反射波を検出し、
前記到達期間算出手段は、前記第１及び第２のアンテナから電磁波が放射されたタイミングと前記第１及び第２の検出手段により反射波が検出されたタイミングとを計測し、該計測したタイミングから該第１及び第２のアンテナから放射された電磁波がユーザ及び各スピーカに到達するまでの期間を算出し、
前記角度算出手段は、前記到達期間算出手段により算出された期間から音響装置がユーザ及び各スピーカと形成する角度を算出し、
前記位置検出手段は、前記到達期間算出手段により算出された期間から音響装置とユーザ及び各スピーカとの距離を算出し、該算出した距離と前記角度算出手段により算出された角度とからユーザと各スピーカとの位置を検出し、
前記ユーザ位置推測手段は、前記位置検出手段により検出されたユーザと各スピーカとの位置関係に基づいて、ユーザの位置を推測してもよい。
【００２６】
さらに、上記構成において、前記ユーザ位置推測手段は、前記位置検出手段により算出された音響装置とユーザ及び各スピーカとの距離と前記角度算出手段により算出された音響装置とユーザ及び各スピーカとが形成する角度との平均値を算出し、該算出した平均値に近似する距離及び角度からユーザの位置を推測してもよい。
【００２７】
また、上記構成において、前記音響装置は、前記推測されたユーザの位置と前記検出された各スピーカの位置とを各スピーカに通知する位置通知信号を生成する位置通知信号生成手段をさらに備え、
前記第１及び第２の放射手段は、前記生成された位置通知信号と前記音声情報とを多重化して得られた多重化信号をパルス信号に変換し、該変換されたパルス信号を放射し、
前記復調手段は、前記放射されたパルス信号を受信し、復調して得られた多重化信号を位置指示信号と音声情報とに分離する第１の分離手段を備え、
前記スピーカは、前記分離された位置通知信号に基づいてスピーカの出力方向を設定し、該設定した出力方向に回転する回転手段をさらに備えてもよい。
【００２８】
さらに、上記構成において、前記音響装置は、前記推測されたユーザの位置と前記検出された各スピーカの位置とからユーザと各スピーカとの距離を算出する距離算出手段と、
前記距離算出手段により算出されたユーザと各スピーカとの距離に基づいて、各スピーカの出力レベルを設定し、該設定した出力レベルを各スピーカに指示する出力レベル指示信号を生成する出力レベル設定手段と、をさらに備え、
前記第１及び第２の放射手段は、前記生成された出力レベル指示信号と前記音声情報とを多重化して得られた多重化信号をパルス信号に変換し、該変換されたパルス信号を放射し、
前記復調手段は、前記放射されたパルス信号を受信し、復調して得られた多重化信号を出力レベル指示信号と音声情報とに分離する第２の分離手段を備え、
前記スピーカは、前記分離された出力レベル指示信号に基づいて音声情報の出力レベルを設定する出力レベル設定手段を備え、
前記音声情報出力手段は、前記設定した出力レベルの下、前記分離された音声情報を出力してもよい。
【００２９】
また、上記構成において、前記ユーザと各スピーカとの距離Ｌは、音響装置とユーザＵとの距離をＲｕ、音響装置とユーザＵとが形成する角度をθｕ、音響装置と各スピーカとの距離をＲ、音響装置と各スピーカとが形成する角度をθ、としたとき、下式によって定義されてもよい。
【数６】

【００３０】
さらに、上記構成において、前記第１及び第２の検出手段は、ＵＷＢ通信方式により、電磁波を放射するとともに、該電磁波の前記ユーザ及び／又はスピーカにおける反射波を検出し、
前記音響装置は、ＵＷＢ通信方式により、パルス信号を各スピーカに送信してもよい。
【００３１】
上記目的を達成するため、本発明の第５の観点に係る送信方法は、
所定間隔離間して配置された第１及び第２のアンテナを備え、情報に応じて所定の変調をしたパルス信号を受信装置に送信する送信装置における送信方法であって、
前記第１のアンテナから電磁波を放射し、該第１のアンテナに入力された電磁波から該電磁波の前記受信装置における反射波を検出する第１の検出工程と、
前記第２のアンテナから電磁波を放射し、該第２のアンテナに入力された電磁波から該電磁波の前記受信装置における反射波を検出する第２の検出工程と、
前記第１及び第２のアンテナから電磁波が放射されたタイミングと前記第１及び第２の検出工程により反射波が検出されたタイミングとを計測し、該計測したタイミングから該第１及び第２のアンテナから放射された電磁波が前記受信装置に到達するまでの期間を算出する到達期間算出工程と、
前記第１のアンテナから放射された電磁波が前記受信装置に到達するまでの期間と前記第２のアンテナから放射された電磁波が前記受信装置に到達するまでの期間との差分期間を算出する差分期間算出工程と、
前記第１のアンテナから前記パルス信号を放射する第１の放射工程と、
前記第１の送信工程によりパルス信号が放射されたタイミングから前記差分期間後のタイミングに前記第２の送信アンテナから前記パルス信号を放射する第２の放射工程と、
を備える、ことを特徴とする。
【００３２】
上記目的を達成するため、本発明の第６の観点に係る無線通信方法は、
所定間隔離間して配置された第１及び第２のアンテナを備え、情報に応じて所定の変調をしたパルス信号を送信する送信装置と、該送信されたパルス信号を受信し、該受信したパルス信号を該情報に復調して出力する受信装置と、から構成される無線通信システムにおける無線通信方法であって、
前記第１のアンテナから電磁波を放射し、該第１のアンテナに入力された電磁波から該電磁波の前記受信装置における反射波を検出する第１の検出工程と、
前記第２のアンテナから電磁波を放射し、該第２のアンテナに入力された電磁波から該電磁波の前記受信装置における反射波を検出する第２の検出工程と、
前記第１及び第２のアンテナから電磁波が放射されたタイミングと前記第１及び第２の検出工程により反射波が検出されたタイミングとを計測し、該計測したタイミングから該第１及び第２のアンテナから放射された電磁波が前記受信装置に到達するまでの期間を算出する到達期間算出工程と、
前記第１のアンテナから放射された電磁波が前記受信装置に到達するまでの期間と前記第２のアンテナから放射された電磁波が前記受信装置に到達するまでの期間との差分期間を算出する差分期間算出工程と、
前記第１のアンテナから前記パルス信号を放射する第１の放射工程と、
前記第１の送信工程によりパルス信号が放射されたタイミングから前記差分期間後のタイミングに前記第２の送信アンテナから前記パルス信号を放射する第２の放射工程と、
入力された信号を閾値判別することにより、該入力された信号から、前記第１の放射工程から放射されたパルス信号と前記第２の放射工程から放射されたパルス信号との合成パルス信号を抽出するとともに、該抽出した合成パルス信号から前記情報を復調し、該復調した情報を出力する復調工程と、
を備える、ことを特徴とする。
【００３３】
上記目的を達成するため、本発明の第７の観点に係るチャンネル設定方法は、
所定間隔離間して配置された第１及び第２のアンテナを備え、複数チャンネルの音声情報をパルス信号に変換してスピーカに送信する音響装置におけるチャンネル設定方法であって、
前記第１のアンテナから電磁波を放射し、該第１のアンテナに入力された電磁波から該電磁波の各スピーカにおける反射波を検出する第１の検出工程と、
前記第２のアンテナから電磁波を放射し、該第２のアンテナに入力された電磁波から該電磁波の各スピーカにおける反射波を検出する第２の検出工程と、
前記第１及び第２のアンテナから電磁波が放射されたタイミングと前記第１及び第２の検出工程により反射波が検出されたタイミングとを計測し、該計測したタイミングから該第１及び第２のアンテナから放射された電磁波が各スピーカに到達するまでの期間を算出する到達期間算出工程と、
前記到達期間算出工程により算出された期間から音響装置が各スピーカと形成する角度を算出する角度算出工程と、
前記算出された角度に基づいて各スピーカが担当するチャンネルを設定する担当チャンネル設定工程と、
を備える、ことを特徴とする。
【００３４】
上記目的を達成するため、本発明の第８の観点に係る音声再生方法は、
所定間隔離間して配置された第１及び第２のアンテナを備え、複数チャンネルの音声情報をパルス信号に変換してスピーカに送信する音響装置と、該送信されたパルス信号を受信し、該受信したパルス信号から該音声情報を復調して再生する複数のスピーカと、から構成される音響システムにおける音声再生方法であって、
前記第１のアンテナから電磁波を放射し、該第１のアンテナに入力された電磁波から該電磁波の各スピーカにおける反射波を検出する第１の検出工程と、
前記第２のアンテナから電磁波を放射し、該第２のアンテナに入力された電磁波から該電磁波の各スピーカにおける反射波を検出する第２の検出工程と、
前記第１及び第２のアンテナから電磁波が放射されたタイミングと前記第１及び第２の検出工程により反射波が検出されたタイミングとを計測し、該計測したタイミングから該第１及び第２のアンテナから放射された電磁波が各スピーカに到達するまでの期間を算出する到達期間算出工程と、
前記到達期間算出工程により算出された期間から音響装置が各スピーカと形成する角度を算出する角度算出工程と、
前記算出された角度に基づいて各スピーカが担当するチャンネルを設定する担当チャンネル設定工程と、
所定値から前記第１及び第２のアンテナから放射された電磁波が各スピーカに到達するまでの期間を減算して第１及び第２の差分期間を算出する差分期間算出工程と、
各スピーカにおける第１及び第２の差分期間を、前記チャンネル設定工程により設定された各スピーカの担当チャンネルと対応付けて格納する格納工程と、
所定タイミングから前記第１の差分期間後のタイミングに、対応する担当チャンネルの音声情報をパルス信号に変換し、前記第１のアンテナから該変換したパルス信号を放射する第１の放射工程と、
所定タイミングから前記第２の差分期間後のタイミングに、前記第２のアンテナから前記第１の放射工程により放射されたパルス信号と同一のパルス信号を放射する第２の放射工程と、
入力された信号を閾値判別することにより、該入力された信号から、前記第１の放射工程から放射されたパルス信号と前記第２の放射工程から放射されたパルス信号との合成パルス信号を抽出するとともに、該抽出した合成パルス信号から前記音声情報を復調する復調工程と、
前記復調工程により復調された音声情報を出力する音声情報出力工程と、
を備える、ことを特徴とする。
【００３５】
【発明の実施の形態】
（第１の実施の形態）
本発明の第１の実施の形態に係る音響システム１について図面を参照して説明する。
【００３６】
音響システム１は、図１に示すように、ＤＶＤ（Ｄｉｇｉｔａｌ Ｖｅｒｓａｔｉｌｅ Ｄｉｓｃ）プレーヤ１０と、ＤＶＤプレーヤ１０と概略同一の位置に配置され、５サラウンドチャンネル（ｃｈ）のデジタル音声信号Ａ（ＡＣ，ＡＬ，ＡＲ，ＡＳｌ，ＡＳｒ）をＵＷＢ（Ｕｌｔｒａ Ｗｉｄｅ Ｂａｎｄ）通信方式により送信する送信部２０と、該送信部２０により送信されたデジタル音声信号Ａを受信し、アナログ変換して出力するスピーカ３０１〜３０５と、ＤＶＤプレーヤ１０及び送信部２０と概略同一の位置に配置されたレーダ装置４０と、システム制御装置５０と、から構成されている。
【００３７】
このＵＷＢ通信方式とは、極めて広い周波数帯域（超広帯域）を使って通信する技術であり、搬送波を使わずに、非常に細かいパルス幅（例えば１ｎｓ以下）のパルス（インパルス）列からなる信号を用いて情報を伝送する通信方式である。
【００３８】
ＵＷＢ通信方式の第１のメリットは、インパルスを用いることにより、単位時間当たりにより多くの情報を伝送できることである。例えば、パルス幅が１ｎｓのパルスを用いれば、例えば、１ビットのデータを１秒間に１０億個（１ギガビットのデータ）を伝送することができる。
【００３９】
ＵＷＢ通信方式の第２のメリットは、搬送波を用いずにパルスを送信するため、送信側の消費電力を低減できることである。これは、搬送波を用いる場合、送信側にて常に電波を発信し続けなければならないのに対し、搬送波を用いない場合、パルスを発信するタイミングにだけ電圧等を印加すればよいためである。
【００４０】
ＵＷＢ通信方式の第３のメリットは、極めて広い周波数帯域を使って通信するため、ノイズの影響を受けにくいということである。例えば、ある周波数成分にノイズが発生したとしても、影響を受けるのは、インパルスを構成する周波数成分の一部である。このため、受信側において、情報の受信（例えば、１ビットのデータ値の判別）には、ほとんど不都合が生じない。
【００４１】
ＤＶＤプレーヤ１０は、図２に示すように、データ読取部１１、データ処理部１２と、映像デコーダ１３と、映像データバッファ１４と、映像出力部１５と、音声デコーダ１６と、から構成されている。ＤＶＤプレーヤ１０は、後述するシステム制御装置５０から供給される再生指示信号に応じてＤＶＤの再生動作を開始する。
【００４２】
データ読取部１１は、ＤＶＤに記録されたデータを読み取り、読み取ったデータ信号を増幅した後、データビットストリームに変換してデータ処理部１２に供給する。
【００４３】
データ処理部１２は、データ読取部１１から供給されるデータビットストリームの中のパケットヘッダを検出し、検出したパケットヘッダに基づいてパケットの種類を識別する。データ処理部１２は、パケットの種類に基づいて、データビットストリームを映像データビットストリームのパケットと音声データビットストリームのパケットとに分離し、映像データビットストリームを映像デコーダ１３に、音声データビットストリームを音声デコーダ１４に、夫々供給する。
【００４４】
映像デコーダ１３は、データ処理部１２から供給される映像データビットストリームにデコード処理を施して、デジタル映像信号Ｖを生成して出力する。
【００４５】
映像データバッファ１４は、ＲＡＭ（Ｒａｎｄｏｍ Ａｃｃｅｓｓ Ｍｅｍｏｒｙ）等から構成され、映像デコーダ１３から出力されたデジタル映像信号Ｖを格納し、後述するシステム制御装置５０から供給される映像出力指示信号ＶＯをトリガとして格納するデジタル映像信号Ｖを映像出力部１５に供給する。
【００４６】
映像出力部１５は、映像データバッファ１４から供給されるデジタル映像信号Ｖをアナログ変換して出力する。
【００４７】
音声デコーダ１６は、データ処理部１２から供給される音声データビットストリームにデコード処理を施して、５サラウンドチャンネル、即ちセンタチャンネル（Ｃｃｈ）、レフトチャンネル（Ｌｃｈ）、ライトチャンネル（Ｒｃｈ）、サラウンドレフトチャンネル（Ｓｌｃｈ）、サラウンドライトチャンネル（Ｓｒｃｈ）のデジタル音声信号ＡＣ、ＡＬ、ＡＲ、ＡＳｌ、及びＡＳｒを生成する。
【００４８】
音声デコーダ１６は、５個の出力端子１６１Ｃ、１６１Ｌ、１６１Ｒ、１６１Ｓｌ、及び１６１Ｓｒを備え、生成したデジタル音声信号Ａｘ（ｘ＝Ｃ，Ｌ，Ｒ，Ｓｌ，Ｓｒ）を、対応する出力端子１６１ｘから出力する。
【００４９】
図１に示す送信部２０は、５つの出力端子１６１ｘに夫々接続された送信装置２１Ｃ、２１Ｌ、２１Ｒ、２１Ｓｌ、及び２１Ｓｒから構成されている。
【００５０】
送信装置２１ｘは、図３に示すように、２つの音声データバッファ２１１ｘ１、及び２１１ｘ２と、２つのパルス生成部２１２ｘ１、及び２１２ｘ２と、所定間隔２Ｄだけ離間して配置された２つの送信アンテナ２１３ｘ１、及び２１３ｘ２と、から構成されている。
【００５１】
送信装置２１ｘは、システム制御装置５０から音声出力指示信号ＡＯｘｉ（ｉ＝１，２）が供給されると、デジタル音声信号Ａｘの０／１に応じて位置変調したパルス信号Ｐｘを生成し、生成したパルス信号ＰｘをＵＷＢ通信方式によりスピーカ３０ｊ（ｊ＝１，２，３，４，５）に送信する。
【００５２】
音声データバッファ２１１ｘｉは、ＲＡＭ等から構成され、音声デコーダ１６から出力されたデジタル音声信号Ａｘを格納する。音声データバッファ２１１ｘｉは、システム制御装置５０から供給される音声出力指示信号ＡＯｘｉをトリガとして格納するデジタル音声信号Ａｘをパルス生成部２１２ｘｉに供給する。
【００５３】
パルス生成部２１２ｘｉは、音声データバッファ２１１ｘｉから出力されるデジタル音声信号ＡＯｘｉの０／１に応じて振幅ｍのパルスを位置変調（Ｐｕｌｓｅ Ｐｏｓｉｔｉｏｎ Ｍｏｄｕｌａｔｉｏｎ）し、電気パルス信号Ｐｘを生成する。
【００５４】
送信アンテナ２１３ｘｉは、パルス生成部２１２ｘｉにおいて生成された電気パルス信号Ｐｘを電磁パルス信号に変換し、変換した電磁パルス信号を搬送波を用いずにスピーカ３０ｊに送信する。
【００５５】
スピーカ３０ｊは、図４に示すように、受信装置３１ｊと、音声出力部３２ｊと、から構成されている。
【００５６】
受信装置３１ｊは、受信アンテナ３１１ｊと、復調部３１２ｊと、から構成され、送信部２０から送信されるパルス信号Ｐｘを受信し、受信したパルス信号Ｐｘを元のデジタル音声信号Ａｘに復調して出力する。
【００５７】
受信アンテナ３１１ｊは、送信部２０から送信される電磁パルス信号を受信し、受信した電磁パルス信号を電気パルス信号Ｐｘに変換する。
【００５８】
復調部３１２ｊは、受信アンテナ３１１ｊにおいて変換された電気パルス信号Ｐｘの各パルスの大きさと所定の閾値ｔ（ｍ＜ｔ＜２ｍ）とを比較してパルスの有無を判別し、この判別した結果に基づいて電気パルス信号Ｐｘを元のデジタル音声信号Ａｘに復調して出力する。
【００５９】
音声出力部３２ｊは、受信装置３１ｊから出力されたデジタル音声信号Ａｘをアナログ音声信号に変換し、変換したアナログ信号を増幅して出力する。
【００６０】
レーダ装置４０は、図５に示すように、２つの検出器４１１及び４１２と、位置検出部４２と、から構成され、後述するシステム制御装置５０から供給される位置検出指示信号に応じてスピーカ３０ｊの位置検出動作を開始する。
【００６１】
検出器４１ｋ（ｋ＝１，２）は、図６に示すように、同期信号源４１１ｋと、パルス生成部４１２ｋと、アンテナ４１３ｋと、コンパレータ４１４ｋと、同期信号検出部４１５ｋと、から構成されている。また、検出器４１ｋのアンテナ４１３ｋ同士は、所定間隔２Ｄだけ離間して配置されている。
【００６２】
検出器４１ｋは、同期信号Ｓｋ（ｋ＝１，２）の０／１に応じて振幅変調（Ｐｕｌｓｅ Ａｍｐｌｉｔｕｄｅ Ｍｏｄｕｌａｔｉｏｎ）して生成したパルス信号Ｐｋを空中に放射する。また、検出器４１ｋは、スピーカ３０ｊにおいて反射したパルス信号を受信し、受信したパルス信号から同期信号を検出する。
【００６３】
同期信号源４１１ｋは、０／１を所定パターンに配置して同期信号Ｓｋを生成し、出力する。パルス生成部４１２ｋは、同期信号源４１１ｋから出力される同期信号Ｓｋの０／１に応じてパルスを振幅変調して電気パルス信号Ｐｋを生成する。
【００６４】
アンテナ４１３ｋは、パルス生成部４１２ｋにおいて生成された電気パルス信号Ｐｋを電磁パルス信号に変換し、変換した電磁パルス信号を空中に放射する。また、アンテナ４１３ｋは、スピーカ３０ｊにおいて反射された電磁パルス信号を受信し、受信した電磁パルス信号を電気パルス信号Ｐｋに変換する。
【００６５】
コンパレータ４１４ｋは、オペアンプ等から構成され、負入力端子に電圧を印加することにより若干オフセットされている。コンパレータ４１４ｋは、アンテナ４１３ｋにおいて変換された電気パルス信号Ｐｋの各パルスの大きさと所定の閾値とを比較してパルスの有無を判別し、この判別した結果に基づいて電気パルス信号Ｐｋをデジタル信号に変換して出力する。
【００６６】
同期信号検出部４１５ｋは、コンパレータ４１４ｋから出力されるデジタル信号から同期信号Ｓｋを検出する。同期信号検出部４１５ｋは、同期信号Ｓｋを検出すると、システム制御装置５０に同期検出信号を供給する。
【００６７】
位置検出部４２は、ＣＰＵ（Ｃｅｎｔｒａｌ Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）、ＲＯＭ（Ｒｅａｄ Ｏｎｌｙ Ｍｅｍｏｒｙ）等から構成され、内部に、ＲＡＭ等から構成される図示しないメモリと、図示しないクロック回路と、を備える。また、メモリは、図７に示す検出テーブルを備える。
【００６８】
位置検出部４２は、クロック回路を用いて検出器４１ｋがパルス信号を放射したタイミングＴ０を計測し、計測したタイミングＴ０を検出テーブルに格納する。
【００６９】
位置検出部４２は、検出器４１１から同期検出信号が供給されると、該供給されたタイミングを計測し、計測したタイミングＴ１ｌ（ｌ＝１，２，３，４，５）を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されると、検出器４１２から同期検出信号が供給されたタイミングを計測し、計測したタイミングＴ２ｌを検出テーブルに格納する。
【００７０】
位置検出部４２は、検出テーブルに格納したタイミングＴ０とタイミングＴ１ｌとから検出器４１１の検出期間ΔＴ１ｌ（＝Ｔ１ｌ−Ｔ０）を、検出テーブルに格納したタイミングＴ０とタイミングＴ２ｌとから検出器４１２の検出期間ΔＴ２ｌ（＝Ｔ２ｌ−Ｔ０）を、夫々算出し、検出テーブルに格納する。
【００７１】
位置検出部４２は、算出した検出期間ΔＴ１ｌとＲＯＭ等に格納している電磁パルス信号の伝送速度Ｖとから、検出器４１１と各スピーカ３０ｊとの距離Ｒ１ｌ（＝Ｖ・ΔＴ１ｌ／２）を、検出期間ΔＴ２ｌと電磁パルス信号の伝送速度Ｖとから、検出器４１２と各スピーカ３０ｊとの距離Ｒ２ｌ（＝Ｖ・ΔＴ２ｌ／２）を、夫々算出する。
【００７２】
位置検出部４２は、算出した距離Ｒ１ｌと距離Ｒ２ｌとを、以下に示す数７及び数８に代入して、図８に示すレーダ装置４０と各スピーカ３０ｊとが形成する角度θｌの余弦ｃｏｓθｌと、レーダ装置４０と各スピーカ３０ｊとの距離Ｒｌを算出し、検出テーブルに格納する。
【数７】

【数８】

【００７３】
システム制御装置５０は、ＣＰＵ、ＲＡＭ、ＲＯＭ等から構成され、図示しない指示部からＤＶＤの再生が指示されると、ＤＶＤプレーヤ１０に再生指示信号を、レーダ装置４０に位置検出指示信号を、供給する。
【００７４】
システム制御装置５０は、位置検出部４２において求めた角度θｌが小さいスピーカ３０ｊから順に、即ち算出した余弦ｃｏｓθｌが大きいスピーカ３０ｊから順に、Ｒｃｈスピーカ、Ｓｒｃｈスピーカ、Ｃｃｈスピーカ、Ｓｌｃｈスピーカ、Ｌｃｈスピーカ、と設定する。
【００７５】
システム制御装置５０は、位置検出部４２の検出テーブルに格納されている検出期間ΔＴ１ｌ及び検出期間ΔＴ２ｌの中から最長検出期間ΔＴＭＡＸを検索する。システム制御装置５０は、検索した最長検出期間ΔＴＭＡＸと各検出期間ΔＴ１ｌとからδＴ１ｌ（＝（ΔＴＭＡＸ−ΔＴ１ｌ）／２）を、最長検出期間ΔＴＭＡＸと各検出期間ΔＴ２ｌとからδＴ２ｌ（＝（ΔＴＭＡＸ−ΔＴ２ｌ）／２）を、夫々算出する。
【００７６】
システム制御装置５０は、所定タイミングをＴ＝０と設定し、Ｔ＝δＴ１ｌになると、対応するチャンネルｘｃｈの音声データバッファ２１１ｘ１に音声出力指示信号ＡＯｘ１を供給し、Ｔ＝δＴ２ｌになると、対応するチャンネルｘｃｈの音声データバッファ２１１ｘ２に音声出力指示信号ＡＯｘ２を供給する。また、システム制御装置５０は、Ｔ＝ΔＴＭＡＸ／２になると、ＤＶＤプレーヤ１０の映像データバッファ１４に映像出力指示信号ＶＯを供給する。
【００７７】
次に、上記構成を備える音響システム１の再生動作について、図９、図１０、及び図１１に示すフローチャートを参照して説明する。この再生動作は、スピーカ３０ｊの位置を検出して該スピーカ３０ｊが担当するチャンネルを設定し、該スピーカ３０ｊに設定したチャンネルの音声信号を送信し、ＤＶＤを再生する動作である。このＤＶＤ再生動作は、ユーザが指示部においてＤＶＤの再生をシステム制御装置５０に指示することにより開始する。
【００７８】
まず、ＤＶＤに記憶されたデータを読み取り、読み取ったデータを映像データとチャンネル単位の音声データとに分離して格納する動作について、図９に示すフローチャートを参照して説明する。
【００７９】
ユーザからＤＶＤの再生が指示されると、システム制御装置５０は、ＤＶＤプレーヤ１０に再生指示信号を供給する。
【００８０】
再生指示信号が供給されると、ＤＶＤプレーヤ１０は、データ読取部１１において、ＤＶＤに記録されたデータを読み取り（ステップＳ９０１）、読み取ったデータ信号を増幅した後データビットストリームに変換する。ＤＶＤプレーヤ１０は、データ処理部１２において、変換したデータビットストリームを映像データビットストリームと音声データビットストリームとにパケット分離する。
【００８１】
ＤＶＤプレーヤ１０は、映像デコーダ１３において、映像データビットストリームにデコード処理を施してデジタル映像信号Ｖを生成する。また、ＤＶＤプレーヤ１０は、音声デコーダ１６において、データ処理部１２から供給される音声データビットストリームにデコード処理を施して、Ｃｃｈ、Ｌｃｈ、Ｒｃｈ、Ｓｌｃｈ、Ｓｒｃｈのデジタル音声信号ＡＣ、ＡＬ、ＡＲ、ＡＳｌ、及びＡＳｒを生成する（ステップＳ９０２）。
【００８２】
ＤＶＤプレーヤ１０は、この生成したデジタル映像信号Ｖを映像データバッファ１４に格納する。また、ＤＶＤプレーヤ１０は、この生成したデジタル音声信号Ａｘ（ｘ＝Ｃ，Ｌ，Ｒ，Ｓｌ，Ｓｒ）を、対応する送信装置２１Ｃ、２１Ｌ、２１Ｒ、２１Ｓｌ、及び２１Ｓｒに夫々供給する。送信装置２１ｘは、ＤＶＤプレーヤ１０から供給されるデジタル音声信号Ａｘを音声データバッファ２１１ｘ１、及び音声データバッファ２１１ｘ２に格納する（ステップＳ９０３）。
【００８３】
次に、各スピーカ３０ｊの位置を検出し、検出した位置に基づいて各スピーカ３０ｊの担当チャンネルを設定する動作について、図１０に示すフローチャートを参照して説明する。
【００８４】
また、ユーザからＤＶＤの再生が指示されると、システム制御装置５０は、レーダ装置４０に位置検出指示信号を供給する。
【００８５】
位置検出指示信号が供給されると、レーダ装置４０を構成する２つの検出器４１ｋ（ｋ＝１，２）は、同期信号Ｓｋの０／１に応じてパルスを振幅変調し、パルス信号Ｐｋを生成する（ステップＳ１００１）。
【００８６】
レーダ装置４０は、検出器４１１において生成したパルス信号Ｐ１と、検出器４１２において生成したパルス信号Ｐ２と、を同一のタイミングＴ０で空中に放出する（ステップＳ１００２）。
【００８７】
位置検出部４２は、検出器４１ｋがパルス信号Ｐｋを空中に放射したタイミングＴ０を検出テーブルに格納する（ステップＳ１００３）。
【００８８】
検出器４１ｋは、スピーカ３０ｊで反射されたパルス信号Ｐｋを受信し、受信したパルス信号Ｐｋをデジタル信号に変換する（ステップＳ１００４）。
【００８９】
検出器４１ｋは、同期信号検出部４１５ｋにおいて、変換したデジタル信号から同期信号Ｓｋを検出する（ステップＳ１００５）。検出器４１ｋは、同期信号Ｓｋを検出すると（ステップＳ１００５にてＹＥＳ）、位置検出部４２に同期検出信号を供給する。
【００９０】
位置検出部４２は、検出器４１１から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴ１ｌ（ｌ＝１，２，３，４，５）を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴ２ｌを検出テーブルに格納する（ステップＳ１００６）。
【００９１】
位置検出部４２は、検出テーブルに格納したタイミングＴ０とタイミングＴ１ｌとから検出器４１１の検出期間ΔＴ１ｌ（＝Ｔ１ｌ−Ｔ０）を、メモリ４２１に格納したタイミングＴ０とタイミングＴ２ｌとから検出器４１２の検出期間ΔＴ２ｌ（＝Ｔ２ｌ−Ｔ０）を、夫々算出し、検出テーブルに格納する（ステップＳ１００７）。
【００９２】
位置検出部４２は、算出した検出期間ΔＴ１ｌとＲＯＭ等に格納している電磁パルス信号の伝送速度Ｖとから検出器４１１と各スピーカ３０ｊとの距離Ｒ１ｌ（＝Ｖ・ΔＴ１ｌ／２）を、検出期間ΔＴ２ｌと電磁パルス信号の伝送速度Ｖとから検出器４１２と各スピーカ３０ｊとの距離Ｒ２ｌ（＝Ｖ・ΔＴ２ｌ／２）を、夫々算出する（ステップＳ１００８）。
【００９３】
位置検出部４２は、算出した距離Ｒ１ｌと距離Ｒ２ｌとからレーダ装置４０と各スピーカ３０ｊとが形成する角度θｌ（０≦θｌ≦π）の余弦ｃｏｓθｌを算出し、検出テーブルに格納する（ステップＳ１００９）。
【００９４】
システム制御装置５０は、位置検出器４２において求めた角度θｌが小さいスピーカ３０ｊから順に、即ち算出した余弦ｃｏｓθｌが大きいスピーカ３０ｊから順に、Ｒｃｈスピーカ、Ｓｒｃｈスピーカ、Ｃｃｈスピーカ、Ｓｌｃｈスピーカ、Ｌｃｈスピーカ、と設定する（ステップＳ１０１０）。
【００９５】
続いて、チャンネルが設定されたスピーカ３０ｊに対応するチャンネルの音声データを無線通信方式により送信し、送信した音声データを各スピーカ３０ｊから再生する動作について、図１１に示すフローチャートを参照して説明する。
【００９６】
システム制御装置５０は、位置検出部４２の検出テーブルに格納されている検出期間ΔＴ１ｌ及び検出期間ΔＴ２ｌの中から最長検出期間ΔＴＭＡＸを検索する（ステップＳ１１０１）。
【００９７】
システム制御装置５０は、検索した最長検出期間ΔＴＭＡＸと各検出期間ΔＴ１ｌとからδＴ１ｌ（＝（ΔＴＭＡＸ−ΔＴ１ｌ）／２）を、最長検出期間ΔＴＭＡＸと各検出期間ΔＴ２ｌとからδＴ２ｌ（＝（ΔＴＭＡＸ−ΔＴ２ｌ）／２）を、夫々算出する（ステップＳ１１０２）。
【００９８】
システム制御装置５０は、所定タイミングをＴ＝０と設定し、Ｔ＝δＴ１ｌになると（ステップＳ１１０３にてＹＥＳ）、対応するチャンネルｘｃｈの送信装置２１ｘの音声データバッファ２１１ｘ１に音声出力指示信号ＡＯｘ１を供給する。また、システム制御装置５０は、Ｔ＝δＴ２ｌになると（ステップＳ１１０３にてＹＥＳ）、音声データバッファ２１１ｘ２に音声出力指示信号ＡＯｘ２を供給する。
【００９９】
送信装置２１ｘは、音声出力指示信号ＡＯｘｉが供給されると、音声データバッファ２１１ｘｉに格納するデジタル音声信号Ａｘを出力する（ステップＳ１１０４）。
【０１００】
送信装置２１ｘは、パルス生成部２１２ｘｉにおいて、例えば図１２Ａに示すデジタル音声信号Ａｘの０／１に応じて振幅ｍのパルスを位置変調して図１２Ｂに示すパルス信号Ｐｘを生成する（ステップＳ１１０５）。
【０１０１】
送信装置２１ｘは、図１３に示すように、パルス生成部２１２ｘ１において生成したパルス信号Ｐｘと、パルス生成部２１２ｘ２において生成したパルス信号Ｐｘと、を｜δＴ２ｌ−δＴ１ｌ｜（＝｜ΔＴ１ｌ−ΔＴ２ｌ／２｜）だけ異なるタイミングで空中に放射する（ステップＳ１１０６）。
【０１０２】
このように｜ΔＴ１ｌ−ΔＴ２ｌ／２｜だけ異なるタイミングで空中に放射された２つのパルス信号Ｐｘは、図１４に示すように、Ｔ＝ＴＭＡＸに、送信装置２１ｘと距離Ｒｌだけ離間し、送信装置２１ｘと角度θｌを形成する位置、即ち対応するチャンネルｃｈｘが設定されたスピーカ３０ｊの位置、において位相が一致し、互いに強め合う。
【０１０３】
このため、Ｔ＝ＴＭＡＸ／２において、スピーカ３０ｊの受信装置３１ｊには、図１２Ｃに示す振幅２ｍの合成パルス信号２Ｐｘが入力される（ステップＳ１１０７）。
【０１０４】
スピーカ３０ｊの受信装置３１ｊは、復調部３１２ｊにおいて、図１５Ａに示す受信したパルス信号の各パルスの大きさと所定の閾値ｔ（ｍ＜ｔ≦２ｍ）とを比較し、受信したパルス信号から合成パルス信号２Ｐｘを抽出する。受信装置３１ｊは、抽出した合成パルス信号２Ｐｘを図１５Ｂに示す元のデジタル音声信号Ａｘに復調する（ステップＳ１１０８）。
【０１０５】
スピーカ３０ｊは、音声出力部３２ｊにおいて、復調したデジタル音声信号Ａｘをアナログ音声信号に変換するとともに、変換したアナログ信号を増幅した後に出力して、音声データを再生する（ステップＳ１１０９）。
【０１０６】
また、システム制御装置５０は、Ｔ＝ＴＭＡＸ／２になると、ＤＶＤプレーヤ１０に映像出力指示信号ＶＯを供給する。ＤＶＤプレーヤ１０は、映像出力指示信号ＶＯが供給されると、映像データバッファ１４に格納するデジタル映像信号Ｖを出力し、出力したデジタル映像信号Ｖをアナログ音声信号に変換し、変換したアナログ音声信号を出力して、映像データを再生する。
【０１０７】
上記再生動作により、音響システム１は、ランダムに配置されたスピーカ３０ｊの位置を検出し、検出した位置に基づいて各スピーカ３０ｊが担当するチャンネル（ｘｃｈ）を設定することができる。
【０１０８】
また、音響システム１は、担当チャンネル（ｘｃｈ）が設定されたスピーカ３０ｊに、対応するチャンネル（ｘｃｈ）の音声信号Ａｘを無線通信方式により送信することができる。さらに、音響システム１は、映像データと各チャンネルの音声データとを同一のタイミング（Ｔ＝ＴＭＡＸ／２）で再生することができる。
【０１０９】
（第２の実施の形態）
本発明の第２の実施の形態に係る音響システム２について図面を参照して説明する。なお、上記第１の実施の形態に係る音響システム１と同様の構成については、その説明を省略する。
【０１１０】
音響システム２は、図１６に示すように、ＤＶＤプレーヤ１０と、送信部６０と、スピーカ７０１〜７０５と、レーダ装置４０と、システム制御装置５０と、から構成されている。
【０１１１】
送信部６０は、５つの出力端子１６１ｘに夫々接続された送信装置６１Ｃ、６１Ｌ、６１Ｒ、６１Ｓｌ、及び６１Ｓｒから構成されている。送信装置６１ｘは、図１７に示すように、音声データバッファ２１１ｘ１、及び２１１ｘ２と、２つの加算器６１１ｘ１、及び６１１ｘ２と、パルス生成部２１２ｘ１、及び２１２ｘ２と、送信アンテナ２１３ｘ１、及び２１３ｘ２と、から構成され、システム制御装置５０から出力レベル指示信号ＡＬｘと音声出力指示信号ＡＯｘとが供給される。
【０１１２】
加算器６１１ｘｉは、システム制御装置５０から供給される出力レベル指示信号ＡＬｘｉと、音声データバッファ２１１から供給されるデジタル音声信号Ａｘと、を加算して多重化信号Ｍｘを生成して出力する。
【０１１３】
スピーカ７０ｊは、図１８に示すように、受信装置７１ｊと、出力レベル設定部７２ｊと、音声出力部３２ｊと、から構成され、受信装置７１ｊは、受信アンテナ３１１ｊと、復調部３１２ｊと、多重化信号分離部７１１ｊと、から構成されている。
【０１１４】
多重化信号分離部７１１ｊは、復調部３１２ｊにおいて復調された多重化信号Ｍｘを出力レベル指示信号ＡＬｘとデジタル音声信号Ａｘとに分離して、出力レベル指示信号ＡＬｘを出力レベル設定部７２ｊに、デジタル音声信号Ａｘを音声出力部３２ｊに、供給する。
【０１１５】
出力レベル設定部７２ｊは、多重化信号分離部７１１ｊから供給される出力レベル指示信号ＡＬｘに基づいて、音声出力部３２ｊの増幅度を設定する。
【０１１６】
音声出力部３２ｊは、受信装置７１ｊから出力されたデジタル音声信号Ａｘをアナログ音声信号に変換し、出力レベル設定部７２ｊにより設定された増幅度の下、変換したアナログ信号を増幅して出力する。
【０１１７】
レーダ装置４０は、検出器４１ｋと、位置検出部４２と、から構成され、システム制御装置５０から供給される位置検出指示信号に応じてスピーカ７０ｊの位置とユーザＵの位置とを検出する。
【０１１８】
位置検出部４２は、クロック回路を用いてレーダ装置４０の検出器４１ｋがパルス信号Ｐｋを放射したタイミングＴ０を計測し、計測したタイミングＴ０を検出テーブルに格納する。
【０１１９】
位置検出部４２は、検出器４１１から同期検出信号が供給されると、該供給されたタイミングを計測し、計測したタイミングＴ１ｎ（ｎ＝１，２，３，４，５、６）を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されると、検出器４１２から同期検出信号が供給されたタイミングを計測し、計測したタイミングＴ２ｎを検出テーブルに格納する。
【０１２０】
位置検出部４２は、検出テーブルに格納したタイミングＴ０とタイミングＴ１ｎとから検出器４１１の検出期間ΔＴ１ｎ（＝Ｔ１ｎ−Ｔ０）を、検出テーブルに格納したタイミングＴ０とタイミングＴ２ｎとから検出器４１２の検出期間ΔＴ２ｎ（＝Ｔ２ｎ−Ｔ０）を、夫々算出し、検出テーブルに格納する。
【０１２１】
位置検出部４２は、算出した検出期間ΔＴ１ｎとＲＯＭ等に格納している電磁パルス信号の伝送速度Ｖとから、検出器４１１とユーザＵ及び各スピーカ７０ｊとの距離Ｒ１ｎ（＝Ｖ・ΔＴ１ｎ／２）を、検出期間ΔＴ２ｎと電磁パルス信号の伝送速度Ｖとから、検出器４１２とユーザＵ及び各スピーカ７０ｊとの距離Ｒ２ｎ（＝Ｖ・ΔＴ２ｎ／２）を、夫々算出し、検出テーブルに格納する。
【０１２２】
位置検出部４２は、算出した距離Ｒ１ｎと距離Ｒ２ｎとを、以下に示す数９及び数１０に代入して、レーダ装置４０とユーザＵ及び各スピーカ７０ｊ及びユーザＵとの距離Ｒｎと、レーダ装置４０とユーザＵ及び各スピーカ７０ｊとが形成する角度θｎと、を算出し、該算出した位置パラメータ（Ｒｎ、θｎ）を検出テーブルに格納する。
【数９】

【数１０】

【０１２３】
システム制御装置５０は、位置検出部４２の検出テーブルに格納されているＲｎとθｎとの平均値Ｒｎａとθｎａとを算出し、算出した平均値Ｒｎａとθｎａとに近似するＲｎとθｎとを備える位置パラメータを検出テーブルから検出し、検出した位置パラメータをユーザＵの位置パラメータ（Ｒｕ、θｕ）として設定する。
【０１２４】
システム制御装置５０は、ユーザＵの位置パラメータ以外の位置パラメータ（Ｒｌ、θｌ）（ｌ＝１，２，３，４，５）について、角度θｌが小さいスピーカ７０ｊから順に、Ｒｃｈスピーカ、Ｓｒｃｈスピーカ、Ｃｃｈスピーカ、Ｓｌｃｈスピーカ、Ｌｃｈスピーカ、と設定する。
【０１２５】
システム制御装置５０は、ユーザＵの位置パラメータ（Ｒｕ、θｕ）と各スピーカ７０ｊの位置パラメータ（Ｒｌ、θｌ）とを、以下に示す数１１に代入して、図１６に示すユーザＵと各スピーカ７０ｊとの距離Ｌｌを算出する。
【数１１】

【０１２６】
システム制御装置５０は、算出した距離Ｌｌに基づいて各スピーカ７０ｊの出力レベルを設定するとともに、設定した出力レベルの音声を出力することをスピーカ７０ｊに指示する出力レベル指示信号ＡＬｘを生成し、生成した出力レベル指示信号ＡＬｘを対応する送信装置６１ｘに供給する。
【０１２７】
例えば図１６に示すように、システム制御装置５０は、算出したユーザＵとスピーカ７０ｊとの距離が０．９Ｌのとき、距離Ｌにおいて設定した出力レベルよりも小さい音声出力レベルを設定し、距離が１．３Ｌのとき、距離Ｌにおいて設定した出力レベルよりも大きい出力レベルを設定する。
【０１２８】
次に、上記構成を備える音響システム２の再生動作について、図１９、図２０、及び図２１に示すフローチャートを参照して説明する。この再生動作は、検出したユーザＵとスピーカ７０ｊとの位置関係に基づいて、各スピーカ７０ｊの出力レベルを設定して、ＤＶＤを再生する動作である。なお、上記第１の実施の形態に係る音響システム１の再生動作と同様の動作（図９のフローチャート図に示す動作）については、その説明を省略する。
【０１２９】
まず、ユーザＵ及び各スピーカ７０ｊの位置を検出し、検出した位置に基づいて各スピーカ７０ｊの担当するチャンネルを設定する動作について、図１９に示すフローチャートを参照して説明する。
【０１３０】
ユーザからＤＶＤの再生が指示されると、システム制御装置５０は、レーダ装置４０に位置検出信号を供給する。
【０１３１】
位置検出信号が供給されると、レーダ装置４０を構成する２つの検出器４１ｋ（ｋ＝１，２）は、同期信号Ｓｋの０／１に応じてパルスを振幅変調し、パルス信号Ｐｋを生成する（ステップＳ１９０１）。
【０１３２】
レーダ装置４０は、検出器４１１において生成したパルス信号Ｐ１と、検出器４１２において生成したパルス信号Ｐ２と、を同一のタイミングＴ０で空中に放出する（ステップＳ１９０２）。
【０１３３】
位置検出部４２は、検出器４１ｋがパルス信号Ｐｋを空中に放射したタイミングＴ０を検出テーブルに格納する（ステップＳ１９０３）。
【０１３４】
検出器４１ｋは、スピーカ７０ｊで反射されたパルス信号Ｐｋを受信し、受信したパルス信号Ｐｋをデジタル信号に変換する（ステップＳ１９０４）。
【０１３５】
検出器４１ｋは、同期信号検出部４１５ｋにおいて、変換したデジタル信号から同期信号Ｓｋを検出する（ステップＳ１９０５）。検出器４１ｋは、同期信号Ｓｋを検出すると（ステップＳ１９０５にてＹＥＳ）、位置検出部４２に同期検出信号を供給する。
【０１３６】
位置検出部４２は、検出器４１１から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴ１ｎ（ｎ＝１，２，３，４，５，６）を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴ２ｎを検出テーブルに格納する（ステップＳ１９０６）。
【０１３７】
位置検出部４２は、検出テーブルに格納したタイミングＴ０とタイミングＴ１ｌとから検出器４１１の検出期間ΔＴ１ｎ（＝Ｔ１ｎ−Ｔ０）を、検出テーブルに格納したタイミングＴ０とタイミングＴ２ｎとから検出器４１２の検出期間ΔＴ２ｎ（＝Ｔ２ｎ−Ｔ０）を、夫々算出し、検出テーブルに格納する（ステップＳ１９０７）。
【０１３８】
位置検出部４２は、算出した検出期間ΔＴ１ｎとＲＯＭ等に格納している電磁パルス信号の伝送速度Ｖとから検出器４１１と各スピーカ７０ｊとの距離Ｒ１ｎ（＝Ｖ・ΔＴ１ｎ／２）を、検出期間ΔＴ２ｎと電磁パルス信号の伝送速度Ｖとから検出器４１２と各スピーカ７０ｊとの距離Ｒ２ｎ（＝Ｖ・ΔＴ２ｎ／２）を、夫々算出する（ステップＳ１９０８）。
【０１３９】
位置検出部４２は、算出した距離Ｒ１ｎと距離Ｒ２ｎとから、レーダ装置４０とユーザＵ及び各スピーカ７０ｊ及びユーザＵとの距離Ｒｎと、レーダ装置４０とユーザＵ及び各スピーカ７０ｊとが形成する角度θｎと、を算出し、該算出した位置パラメータ（Ｒｎ、θｎ）を検出テーブルに格納する（ステップＳ１９０９）。
【０１４０】
システム制御装置５０は、位置検出部４２の検出テーブルに格納されているＲｎとθｎとの平均値Ｒｎａとθｎａとを算出する（ステップＳ１９１０）。
【０１４１】
システム制御装置５０は、算出した平均値Ｒｎａとθｎａとに近似するＲｎとθｎとを備える位置パラメータを検出テーブルから検出し、検出した位置パラメータをユーザＵの位置パラメータ（Ｒｕ、θｕ）として設定する（ステップＳ１９１１）。
【０１４２】
システム制御装置５０は、ユーザＵの位置パラメータ以外の位置パラメータ（Ｒｌ、θｌ）（ｌ＝１，２，３，４，５）について、角度θｌが小さいスピーカ７０ｊから順に、Ｒｃｈスピーカ、Ｓｒｃｈスピーカ、Ｃｃｈスピーカ、Ｓｌｃｈスピーカ、Ｌｃｈスピーカ、と設定する（ステップＳ１９１２）。
【０１４３】
次に、ユーザＵと各スピーカ７０ｊとの距離を算出し、該算出した距離に基づいて各スピーカ７０ｊの出力レベルを設定する動作について、図２０に示すフローチャートを参照して説明する。
【０１４４】
システム制御装置５０は、ユーザＵの位置パラメータ（Ｒｕ、θｕ）と各スピーカ７０ｊの位置パラメータ（Ｒｌ、θｌ）とからユーザＵと各スピーカ７０ｊとの距離Ｌｌを算出する（ステップＳ２００１）。
【０１４５】
システム制御装置５０は、算出した距離Ｌｌに基づいて各スピーカ７０ｊの出力レベルを設定するとともに、設定した出力レベルの音声を出力することをスピーカ７０ｊに指示する出力レベル指示信号ＡＬｘを生成する（ステップＳ２００２）。
【０１４６】
続いて、チャンネルが設定されたスピーカ７０ｊに対応するチャンネルの音声データを無線通信方式により送信し、送信した音声データを、設定された出力レベルの下、各スピーカ７０ｊから再生する動作について、図２１に示すフローチャートを参照して説明する。
【０１４７】
システム制御装置５０は、検出テーブルに格納する検出期間ΔＴ１ｌ及び検出期間ΔＴ２ｌの中から最長検出期間ΔＴＭＡＸを検索する（ステップＳ２１０１）。
【０１４８】
システム制御装置５０は、検索した最長検出期間ΔＴＭＡＸと各検出期間ΔＴ１ｌとからδＴ１ｌ（＝（ΔＴＭＡＸ−ΔＴ１ｌ）／２）を、最長検出期間ΔＴＭＡＸと各検出期間ΔＴ２ｌとからδＴ２ｌ（＝（ΔＴＭＡＸ−ΔＴ２ｌ）／２）を、夫々算出する（ステップＳ２１０２）。
【０１４９】
システム制御装置５０は、所定タイミングをＴ＝０と設定し、Ｔ＝δＴ１ｌになると（ステップＳ２１０３にてＹＥＳ）、対応するチャンネルｘｃｈの送信装置６１ｘの音声データバッファ２１１ｘ１に音声出力指示信号ＡＯｘ１を、加算器６１１ｘ１に出力レベル指示信号ＡＬｘ１を、供給する。システム制御装置５０は、Ｔ＝δＴ２ｌになると（ステップＳ２１０３にてＹＥＳ）、対応するチャンネルｘｃｈの送信装置６１ｘ２の音声データバッファ２１１ｘ２に音声出力指示信号ＡＯｘ２を、加算器６１１ｘ２に出力レベル指示信号ＡＬｘ２を、供給する。
【０１５０】
送信装置６１ｘは、音声出力指示信号ＡＯｘｉが供給されると、音声データバッファ２１１ｘｉに格納するデジタル音声信号Ａｘを出力する（ステップＳ２１０４）。
【０１５１】
送信装置６１ｘは、加算器６１１ｘにおいて、システム制御装置５０から供給される出力レベル指示信号ＡＬｘｉと音声データバッファ２１１ｘｉから出力されたデジタル音声信号Ａｘとを加算して多重化信号Ｍｘを生成する（ステップＳ２１０５）。
【０１５２】
送信装置６１ｘは、パルス生成部２１２ｘｉにおいて、多重化信号Ｍｘの０／１に応じて振幅ｍのパルスを位置変調して多重化パルス信号ＭＰｘを生成する（ステップＳ２１０６）。
【０１５３】
送信装置６１ｘは、パルス生成部２１２ｘ１において生成した多重化パルス信号ＭＰｘと、パルス生成部２１２ｘ２において生成した多重化パルス信号ＭＰｘと、を｜δＴ２ｌ−δＴ１ｌ｜（＝｜ΔＴ１ｌ−ΔＴ２ｌ／２｜）だけ異なるタイミングで空中に放射する（ステップＳ２１０７）。
【０１５４】
このように｜ΔＴ１ｌ−ΔＴ２ｌ／２｜だけ異なるタイミングで空中に放射された２つの多重化パルス信号ＭＰｘは、Ｔ＝ＴＭＡＸ／２に、送信装置６１ｘと距離Ｒｌだけ離間し、送信装置６１ｘと角度θｌを形成する位置、即ち対応するチャンネルｃｈｘが設定されたスピーカ７０ｊの位置、において位相が一致し、互いに強め合う。
【０１５５】
このため、Ｔ＝ＴＭＡＸ／２において、スピーカ７０ｊの受信装置７１ｊには、振幅２ｍの合成多重化パルス信号２ＭＰｘが入力される（ステップＳ２１０８）。
【０１５６】
スピーカ７０ｊの受信装置７１ｊは、復調部３１２において、受信したパルス信号の各パルスの大きさと所定の閾値ｔ（ｍ＜ｔ≦２ｍ）とを比較し、受信したパルス信号から合成パルス信号２Ｐｘを抽出する。受信装置７１ｊは、抽出した合成多重化パルス信号２ＭＰｘを元の多重化信号Ｍｘに復調する（ステップＳ２１０９）。
【０１５７】
受信装置７１ｊは、多重化信号分離部７１１ｊにおいて、復調した多重化信号Ｍｘを出力レベル指示信号ＡＬｘとデジタル音声信号Ａｘとに分離して、出力レベル指示信号ＡＬｘを出力レベル設定部７２に、デジタル音声信号Ａｘを音声出力部３２に、供給する（ステップＳ２１１０）。
【０１５８】
出力レベル設定部７２ｊは、受信装置７１ｊから供給される出力レベル指示信号ＡＬｘに基づいて、音声出力部３２ｊの増幅度を設定する。音声出力部３２ｊは、設定された増幅度の下、受信装置７１ｊから出力されたデジタル音声信号Ａｘをアナログ音声信号に変換し、変換したアナログ信号を増幅して出力して、音声データを再生する（ステップＳ２１１１）。
【０１５９】
また、システム制御装置５０は、Ｔ＝ＴＭＡＸ／２になると、ＤＶＤプレーヤ１０に映像出力指示信号ＶＯを供給する。ＤＶＤプレーヤ１０は、映像出力指示信号ＶＯが供給されると、映像データバッファ１４に格納するデジタル映像信号Ｖを出力し、出力したデジタル映像信号Ｖをアナログ音声信号に変換し、変換したアナログ音声信号を出力して、映像データを再生する。
【０１６０】
上記再生動作により、音響システム２は、ランダムに配置されたスピーカ７０ｊの位置を検出し、検出した位置に基づいて各スピーカ７０ｊが担当するチャンネル（ｘｃｈ）を設定することができる。また、音響システム２は、担当チャンネル（ｘｃｈ）が設定されたスピーカ７０ｊに、対応するチャンネル（ｘｃｈ）の音声信号Ａｘを無線通信方式により送信することができる。さらに、音響システム２は、映像データと各チャンネルの音声データとを同一のタイミング（Ｔ＝ＴＭＡＸ／２）で再生することができる。
【０１６１】
また、音響システム２は、ユーザＵと各スピーカ７０ｊとの距離Ｌｌを算出し、算出した距離Ｌｌに基づいて各スピーカ７０ｊの出力レベルを設定することができる。このように、各スピーカ７０ｊの出力レベルを調整することにより、音響システム２は、高音質なサラウンド効果を得ることができる。
【０１６２】
（第３の実施の形態）
本発明の第３の実施の形態に係る音響システム３について図面を参照して説明する。なお、上記第１及び第２の実施の形態に係る音響システム１及び音響システム２と同様の構成については、その説明を省略する。
【０１６３】
音響システム３は、図２２に示すように、ＤＶＤプレーヤ１０と、送信部６０と、スピーカ８０１〜８０５と、レーダ装置４０と、システム制御装置５０と、から構成されている。
【０１６４】
送信部６０の送信装置６１ｘには、システム制御装置５０から位置ベクトル通知信号ＰＶｘと音声出力指示信号ＡＯｘとが供給される。送信装置６１ｘの加算器６１１ｘｉは、システム制御装置５０から供給される位置ベクトル通知信号ＰＶｘｉと、音声データバッファ２１１ｘｉから供給されるデジタル音声信号Ａｘｉと、を加算して多重化信号Ｍｘを生成して出力する。
【０１６５】
スピーカ８０ｊは、図２３に示すように、受信装置７１ｊと、音声出力部３２ｊと、方向設定部８１ｊと、から構成されている。受信装置７１ｊの多重化信号分離部７１１ｊは、復調部３１２ｊにおいて復調された多重化信号Ｍｘを位置ベクトル通知信号ＰＶｘとデジタル音声信号Ａｘとに分離して、位置ベクトル通知信号ＰＶｘを方向設定部８１ｊに、デジタル音声信号Ａｘを音声出力部３２ｊに、供給する。
【０１６６】
方向設定部８１ｊは、多重化信号分離部７１１ｊから供給される位置ベクトル通知信号ＰＶｘからユーザＵとスピーカ８０ｊとの位置を判別し、スピーカ８０ｊの音声出力部３２ｊがユーザＵの方向を向くようにスピーカ８０ｊを図示しない回転機構によって回転させる。例えば図２２に示すように、方向設定部８１１は、ユーザＵに対してスピーカ８０１の音声出力部３２１が３０°左を向いていると判別した場合、スピーカ８０１を回転機構によって右に３０°回転させる。
【０１６７】
システム制御装置５０は、位置検出部４２の検出テーブルに格納されているユーザＵの位置パラメータ（Ｒｕ、θｕ）と各スピーカ８０ｊの位置パラメータ（Ｒｌ、θｌ）とからなる位置ベクトル通知信号ＰＶｘを生成し、生成した位置ベクトル通知信号ＰＶｘを対応する送信装置６１ｘに供給する。
【０１６８】
次に、上記構成を備える音響システム３の再生動作について、図２４に示すフローチャートを参照して説明する。この再生動作は、各スピーカ８０ｊをユーザＵの方向に向かせてＤＶＤを再生する動作である。なお、上記第１及び第２の実施の形態に係る音響システム１及び音響システム２の再生動作と同様の動作（図９、及び図１９のフローチャート図に示す動作）については、その説明を省略する。
【０１６９】
システム制御装置５０は、位置検出部４２の検出テーブルに格納されているユーザＵの位置パラメータ（Ｒｕ、θｕ）と各スピーカ８０ｊの位置パラメータ（Ｒｌ、θｌ）とから位置ベクトル通知信号ＰＶｘを生成する（ステップＳ２４０１）。
【０１７０】
システム制御装置５０は、検出テーブルに格納する検出期間ΔＴ１ｌ及び検出期間ΔＴ２ｌの中から最長検出期間ΔＴＭＡＸを検索する（ステップＳ２４０２）。
【０１７１】
システム制御装置５０は、検索した最長検出期間ΔＴＭＡＸと各検出期間ΔＴ１ｌとからδＴ１ｌ（＝（ΔＴＭＡＸ−ΔＴ１ｌ）／２）を、最長検出期間ΔＴＭＡＸと各検出期間ΔＴ２ｌとからδＴ２ｌ（＝（ΔＴＭＡＸ−ΔＴ２ｌ）／２）を、夫々算出する（ステップＳ２４０３）。
【０１７２】
システム制御装置５０は、所定タイミングをＴ＝０と設定し、Ｔ＝δＴ１ｌになると（ステップＳ２４０４にてＹＥＳ）、対応するチャンネルｘｃｈの送信装置６１ｘの音声データバッファ２１１ｘ１に音声出力指示信号ＡＯｘ１を、加算器６１１ｘ１に位置ベクトル通知信号ＰＶｘ１を、供給する。システム制御装置５０は、Ｔ＝δＴ２ｌになると（ステップＳ２４０４にてＹＥＳ）、対応するチャンネルｘｃｈの送信装置６１ｘ２の音声データバッファ２１１ｘ２に音声出力指示信号ＡＯｘ２を、加算器６１１ｘ２に位置ベクトル通知信号ＰＶｘ２を、供給する。
【０１７３】
送信装置６１ｘは、音声出力指示信号ＡＯｘｉが供給されると、音声データバッファ２１１ｘｉに格納するデジタル音声信号Ａｘを出力する（ステップＳ２４０５）。
【０１７４】
送信装置６１ｘは、加算器６１１ｘにおいて、システム制御装置５０から供給される位置ベクトル通知信号ＰＶｘｉと音声データバッファ２１１ｘｉから出力されたデジタル音声信号Ａｘとを加算して多重化信号Ｍｘを生成する（ステップＳ２４０６）。
【０１７５】
送信装置６１ｘは、パルス生成部２１２ｘｉにおいて、多重化信号Ｍｘの０／１に応じて振幅ｍのパルスを位置変調して多重化パルス信号ＭＰｘを生成する（ステップＳ２４０７）。
【０１７６】
送信装置６１ｘは、パルス生成部２１２ｘ１において生成した多重化パルス信号ＭＰｘと、パルス生成部２１２ｘ２において生成した多重化パルス信号ＭＰｘと、を｜δＴ２ｌ−δＴ１ｌ｜（＝｜ΔＴ１ｌ−ΔＴ２ｌ／２｜）だけ異なるタイミングで空中に放射する（ステップＳ２４０８）。
【０１７７】
このように｜ΔＴ１ｌ−ΔＴ２ｌ／２｜だけ異なるタイミングで空中に放射された２つの多重化パルス信号ＭＰｘは、Ｔ＝ＴＭＡＸ／２に、送信装置６１ｘと距離Ｒｌだけ離間し、送信装置６１ｘと角度θｌを形成する位置、即ち対応するチャンネルｃｈｘが設定されたスピーカ８０ｊの位置、において位相が一致し、互いに強め合う。
【０１７８】
このため、Ｔ＝ＴＭＡＸ／２において、スピーカ８０ｊの受信装置７１ｊには、振幅２ｍの合成多重化パルス信号２ＭＰｘが入力される（ステップＳ２４０９）。
【０１７９】
スピーカ８０ｊの受信装置７１ｊは、復調部３１２ｊにおいて、受信したパルス信号の各パルスの大きさと所定の閾値ｔ（ｍ＜ｔ≦２ｍ）とを比較し、受信したパルス信号から合成パルス信号２Ｐｘを抽出する。受信装置７１ｊは、抽出した合成多重化パルス信号２ＭＰｘを元の多重化信号Ｍｘに復調する（ステップＳ２４１０）。
【０１８０】
受信装置７１ｊは、多重化信号分離部７１１ｊにおいて、復調した多重化信号Ｍｘを位置ベクトル通知信号ＰＶｘとデジタル音声信号Ａｘとに分離して、位置ベクトル通知信号ＰＶｘを方向設定部８１ｊに、デジタル音声信号Ａｘを音声出力部３２ｊに、供給する（ステップＳ２４１１）。
【０１８１】
方向設定部８１ｊは、受信装置７１ｊから供給される位置ベクトル通知信号ＰＶｘからユーザＵとスピーカ８０ｊとの位置を判別し、スピーカ８０ｊの音声出力部３２がユーザＵの方向を向くようにスピーカ８０ｊを回転機構によって回転させる（ステップＳ２４１２）。
【０１８２】
ユーザＵの方向に回転されたスピーカ８０ｊの音声出力部３２ｊは、受信装置７１ｊから出力されたデジタル音声信号Ａｘをアナログ音声信号に変換し、変換したアナログ信号を増幅して出力して、音声データを再生する（ステップＳ２４１３）。
【０１８３】
また、システム制御装置５０は、Ｔ＝ＴＭＡＸ／２になると、ＤＶＤプレーヤ１０に映像出力指示信号ＶＯを供給する。ＤＶＤプレーヤ１０は、映像出力指示信号ＶＯが供給されると、映像データバッファ１４に格納するデジタル映像信号Ｖを出力し、出力したデジタル映像信号Ｖをアナログ音声信号に変換し、変換したアナログ音声信号を出力して、映像データを再生する。
【０１８４】
上記再生動作により、音響システム３は、ランダムに配置されたスピーカ８０ｊの位置を検出し、検出した位置に基づいて各スピーカ８０ｊが担当するチャンネル（ｘｃｈ）を設定することができる。また、音響システム３は、担当チャンネル（ｘｃｈ）が設定されたスピーカ８０ｊに、対応するチャンネル（ｘｃｈ）の音声信号Ａｘを無線通信方式により送信することができる。さらに、音響システム３は、映像データと各チャンネルの音声データとを同一のタイミング（Ｔ＝ＴＭＡＸ／２）で再生することができる。
【０１８５】
また、音響システム３は、ユーザＵの位置パラメータ（Ｒｕ、θｕ）と各スピーカ８０ｊの位置パラメータ（Ｒｌ、θｌ）とに基づいて各スピーカ８０ｊをユーザＵの方向に向かせることができる。このように、各スピーカ８０ｊをユーザＵの方向に向かせることにより、音響システム３は、高音質なサラウンド効果を得ることができる。
【０１８６】
（第４の実施の形態）
本発明の第４の実施の形態に係る音響システム４について図面を参照して説明する。なお、上記第１、第２、及び第３の実施の形態に係る音響システム１、音響システム２、及び音響システム３と同様の構成については、その説明を省略する。
【０１８７】
音響システム４は、図２５に示すように、ＤＶＤプレーヤ１０と、任意の位置に配置された送信部２０と、スピーカ９０１〜９０５と、送信部２０とともに任意の位置に配置されたレーダ装置４０と、システム制御装置５０と、から構成されている。
【０１８８】
スピーカ９０ｊは、図２６に示すように、概略同一の位置に配置された２つの通信装置９１ｊ１及び９１ｊ２と、復調部３１２ｊと、音声出力部３２ｊと、スピーカ制御装置９２ｊと、から構成されている。また、通信装置９１ｊｎ（ｎ＝１，２）は、同期信号源９１１ｊｎと、パルス生成部９１２ｊｎと、アンテナ９１３ｊｎと、から構成されている。
【０１８９】
同期信号源９１１ｊｎは、スピーカ制御装置９２ｊからセンタチャンネル（Ｃｃｈ）通知指示信号が供給されると、レーダ装置４０において生成される同期信号Ｓｋと同一のパターンを有する同期信号Ｓｎを生成し、出力する。パルス生成部９１２ｎは、同期信号源９１１ｊｎから出力される同期信号Ｓｎの０／１に応じてパルスを振幅変調して電気パルス信号Ｐｎを生成する。
【０１９０】
アンテナ９１３ｊｎは、パルス生成部９１２ｊｎにおいて生成された電気パルス信号Ｐｎを電磁パルス信号に変換し、変換した電気パルス信号Ｐｎを空中に放射する。また、アンテナ９１３ｊｎは、送信部２０から送信される電磁パルス信号を受信し、受信した電磁パルス信号を電気パルス信号Ｐｎに変換する。
【０１９１】
スピーカ制御装置９２ｊは、ＣＰＵ、ＲＡＭ、ＲＯＭ等から構成され、図示しない指示部からセンタチャンネル（Ｃｃｈ）の設定が指示されると、通信装置９１ｊｎにセンタチャンネル（Ｃｃｈ）通知指示信号を供給する。
【０１９２】
レーダ装置４０の検出器４１ｋは、センタチャンネル（Ｃｃｈ）に設定されたスピーカ９０ｊから放射されたパルス信号を受信し、受信したパルス信号をデジタル信号に変換する。
【０１９３】
検出器４１ｋは、同期信号検出部４１５ｋにおいて、変換したデジタル信号から同期信号Ｓｋと同一のパターンを有する同期信号Ｓｎを検出する。検出器４１ｋは、同期信号Ｓｎを検出すると、位置検出部４２に同期検出信号を供給する。
【０１９４】
位置検出部４２は、検出器４１１から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴｃ１を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴｃ２をメモリ４２１に格納する。
【０１９５】
位置検出部４２は、メモリ４２１に格納したタイミングＴｃ１とタイミングＴｃ２とから検出器４１１及び検出器４１２において同期信号Ｓｎを検出したタイミングのずれΔＴｃ（＝｜Ｔｃ２−Ｔｃ１｜）を算出し、メモリ４２１に格納する。
【０１９６】
また、位置検出部４２は、検出テーブルに格納されている検出期間ΔＴ１ｌ及び検出期間ΔＴ２ｌの差分ΔＴｌ（＝｜Ｔ２ｌ−Ｔ１ｌ｜）を夫々算出し、図２７に示す検出テーブルに格納する。
【０１９７】
システム制御装置５０は、位置検出部４２の検出テーブルから検出タイミングのずれΔＴｃと等しい検出期間の差分ΔＴｌを検出する。システム制御装置５０は、検出タイミングのずれΔＴｃと等しい検出期間の差分ΔＴｌに対応する角度θｌにあるスピーカ９０ｊをＣｃｈスピーカと特定する。
【０１９８】
さらに、システム制御装置５０は、対応する余弦ｃｏｓθｌが、Ｃｃｈスピーカと特定したスピーカ９０ｊより大きいスピーカ９０ｊから順に、Ｓｌｃｈスピーカ、Ｌｃｈスピーカ、Ｒｃｈスピーカ、Ｓｒｃｈスピーカ、と設定していく。また、システム制御装置５０は、対応する余弦ｃｏｓθｌが、Ｃｃｈスピーカと特定したスピーカ９０ｊより小さいスピーカ９０ｊから順に、Ｓｒｃｈスピーカ、Ｒｃｈスピーカ、Ｌｃｈスピーカ、Ｓｌｃｈスピーカ、と設定していく。
【０１９９】
次に、上記構成を備える音響システム４の再生動作について、図２８及び図２９に示すフローチャートを参照して説明する。この再生動作は、センタチャンネル（Ｃｃｈ）と設定されたスピーカ９０ｊを特定するとともに、他のスピーカ９０ｊの担当チャンネルを設定し、スピーカ９０ｊに設定したチャンネルの音声信号を送信し、ＤＶＤを再生する動作である。なお、上記第１、第２及び第３の実施の形態に係る音響システム１、音響システム２及び音響システム３の再生動作と同様の動作（図９及び図１１のフローチャート図に示す動作）については、その説明を省略する。
【０２００】
まず、各スピーカ９０ｊの位置を検出する動作について、図２８に示すフローチャートを参照して説明する。
【０２０１】
ユーザからＤＶＤの再生が指示されると、システム制御装置５０は、レーダ装置４０に位置検出信号を供給する。
【０２０２】
位置検出信号が供給されると、レーダ装置４０を構成する２つの検出器４１ｋ（ｋ＝１，２）は、同期信号Ｓｋの０／１に応じてパルスを振幅変調し、パルス信号Ｐｋを生成する（ステップＳ２８０１）。
【０２０３】
レーダ装置４０は、検出器４１１において生成したパルス信号Ｐ１と、検出器４１２において生成したパルス信号Ｐ２と、を同一のタイミングＴ０で空中に放出する（ステップＳ２８０２）。
【０２０４】
位置検出部４２は、検出器４１ｋがパルス信号Ｐｋを空中に放射したタイミングＴ０を検出テーブルに格納する（ステップＳ２８０３）。
【０２０５】
検出器４１ｋは、スピーカ９０ｊで反射されたパルス信号Ｐｋを受信し、受信したパルス信号Ｐｋをデジタル信号に変換する（ステップＳ２８０４）。
【０２０６】
検出器４１ｋは、同期信号検出部４１５ｋにおいて、変換したデジタル信号から同期信号Ｓｋを検出する（ステップＳ２８０５）。検出器４１ｋは、同期信号Ｓｋを検出すると（ステップＳ２８０５にてＹＥＳ）、位置検出部４２に同期検出信号を供給する。
【０２０７】
位置検出部４２は、検出器４１１から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴ１ｌ（ｌ＝１，２，３，４，５）を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴ２ｌを検出テーブルに格納する（ステップＳ２８０６）。
【０２０８】
位置検出部４２は、検出テーブルに格納したタイミングＴ０とタイミングＴ１ｌとから検出器４１１の検出期間ΔＴ１ｌ（＝Ｔ１ｌ−Ｔ０）を、メモリ４２１に格納したタイミングＴ０とタイミングＴ２ｌとから検出器４１２の検出期間ΔＴ２ｌ（＝Ｔ２ｌ−Ｔ０）を、夫々算出し、検出テーブルに格納する（ステップＳ２８０７）。
【０２０９】
位置検出部４２は、算出した検出期間ΔＴ１ｌとＲＯＭ等に格納している電磁パルス信号の伝送速度Ｖとから検出器４１１と各スピーカ９０ｊとの距離Ｒ１ｌ（＝Ｖ・ΔＴ１ｌ／２）を、検出期間ΔＴ２ｌと電磁パルス信号の伝送速度Ｖとから検出器４１２と各スピーカ９０ｊとの距離Ｒ２ｌ（＝Ｖ・ΔＴ２ｌ／２）を、夫々算出する（ステップＳ２８０８）。
【０２１０】
位置検出部４２は、算出した距離Ｒ１ｌと距離Ｒ２ｌとからレーダ装置４０と各スピーカ９０ｊとが形成する角度θｌ（０≦θｌ≦π）の余弦ｃｏｓθｌを算出し、検出テーブルに格納する（ステップＳ２８０９）。
【０２１１】
次に、センタチャンネル（Ｃｃｈ）と設定されたスピーカ９０ｊを特定するとともに、他のスピーカ９０ｊの担当チャンネルを設定する動作について、図２９に示すフローチャートを参照して説明する。
【０２１２】
スピーカ制御装置９２ｊは、指示部からセンタチャンネル（Ｃｃｈ）の設定が指示されると、通信装置９１ｊｎにセンタチャンネル（Ｃｃｈ）通知指示信号を供給する。
【０２１３】
通信装置９１ｊｎは、スピーカ制御装置９２ｊからセンタチャンネル（Ｃｃｈ）通知指示信号が供給されると、同期信号源９１１ｊｎにおいて、レーダ装置４０で生成される同期信号Ｓｋと同一のパターンを有する同期信号Ｓｎを生成し、出力する（ステップＳ２９０１）。
【０２１４】
通信装置９１ｊｎは、パルス生成部９１２ｎにおいて、同期信号Ｓｎの０／１に応じてパルスを振幅変調して電気パルス信号Ｐｎを生成する（ステップＳ２９０２）。
【０２１５】
通信装置９１ｊｎは、アンテナ９１３ｊｎにおいて、パルス生成部９１２ｊｎで生成した電気パルス信号を電磁パルス信号に変換し、変換した電磁パルス信号を空中に放射する（ステップＳ２９０３）。
【０２１６】
レーダ装置４０の検出器４１ｋは、センタチャンネル（Ｃｃｈ）に設定されたスピーカ９０ｊから放射されたパルス信号を受信し、受信したパルス信号をデジタル信号に変換する（ステップＳ２９０４）。
【０２１７】
検出器４１ｋは、同期信号検出部４１５ｋにおいて、変換したデジタル信号から同期信号Ｓｋと同一のパターンを有する同期信号Ｓｎを検出する（ステップＳ２９０５）。検出器４１ｋは、同期信号Ｓｎを検出すると（ステップＳ２９０５にてＹＥＳ）、位置検出部４２に同期検出信号を供給する。
【０２１８】
位置検出部４２は、検出器４１１から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴｃ１を検出テーブルに格納する。同様に、位置検出部４２は、検出器４１２から同期検出信号が供給されるタイミングを計測し、計測したタイミングＴｃ２を検出テーブルに格納する（ステップＳ２９０６）。
【０２１９】
位置検出部４２は、メモリ４２１に格納したタイミングＴｃ１とタイミングＴｃ２とから検出器４１１及び検出器４１２において同期信号Ｓｎを検出したタイミングのずれΔＴｃ（＝｜Ｔｃ２−Ｔｃ１｜）を算出し、メモリ４２１に格納する（ステップＳ２９０７）。
【０２２０】
また、位置検出部４２は、検出テーブルに格納されている検出期間ΔＴ１ｌ及び検出期間ΔＴ２ｌの差分ΔＴｌ（＝｜Ｔ２ｌ−Ｔ１ｌ｜）を夫々算出し、検出テーブルに格納する（ステップＳ２９０８）。
【０２２１】
システム制御装置５０は、位置検出部４２の検出テーブルから検出タイミングのずれΔＴｃと等しい検出期間の差分ΔＴｌを検出する（ステップＳ２９０９）。
【０２２２】
システム制御装置５０は、検出タイミングのずれΔＴｃと等しい検出期間の差分ΔＴｌに対応する角度θｌにあるスピーカ９０ｊをＣｃｈスピーカと特定する（ステップＳ２９１０）。
【０２２３】
さらに、システム制御装置５０は、対応する余弦ｃｏｓθｌが、Ｃｃｈスピーカと特定したスピーカ９０ｊより大きいスピーカ９０ｊから順に、Ｓｌｃｈスピーカ、Ｌｃｈスピーカ、Ｒｃｈスピーカ、Ｓｒｃｈスピーカ、と設定していく。また、システム制御装置５０は、対応する余弦ｃｏｓθｌが、Ｃｃｈスピーカと特定したスピーカ９０ｊより小さいスピーカ９０ｊから順に、Ｓｒｃｈスピーカ、Ｒｃｈスピーカ、Ｌｃｈスピーカ、Ｓｌｃｈスピーカ、と設定していく（ステップＳ２９１１）。
【０２２４】
上記再生動作により、音響システム４は、センタチャンネル（Ｃｃｈ）と設定されたスピーカ９０ｊを特定するとともに、他のスピーカ９０ｊの担当チャンネルを設定することができる。
【０２２５】
本発明は、上記実施の形態に限定されず、種々の変形、応用が可能である。以下、本発明に適用可能な上記実施形態の変形態様について、説明する。
【０２２６】
上記実施の形態において、レーダ装置４０は、ＵＷＢ通信方式により、スピーカ３０ｊ、７０ｊ、８０ｊ、及び９０ｊの位置を検出し、送信装置２１、６１は、該スピーカ３０ｊ、７０ｊ、８０ｊ、及び９０ｊに音声データを送信していた。しかし、本発明は、これに限定されず、音響システム１の位置検出手段は、電磁波を用いて位置検出するものであれば任意であり、送信手段は、パルス信号を用いて情報を伝送する他の無線通信方式を用いてもよい。
【０２２７】
また、上記実施の形態において、レーダ装置４０は、変調方式としてパルス振幅変調方式を用い、送信装置２１、６１は、変調方式としてパルス位置変調方式を用いた。しかし、本発明は、これに限定されず、レーダ装置４０は、変調方式としてパルス位置変調方式や情報に応じてパルスの位相を変更するパルス位相変調（Ｐｕｌｓｅ Ｐｈａｓｅ Ｍｏｄｕｌａｔｉｏｎ）方式を用いてもよく、送信装置２１、６１は、変調方式としてパルス振幅変調方式やパルス位相変調方式を用いてもよい。即ち、レーダ装置４０及び送信装置２１、６１の変調方式は、任意である。
【０２２８】
さらに、上記実施の形態において、音響システム１は、５サラウンドチャンネルであったが、本発明は、これに限定されず、音響システム１のサラウンドチャンネル数は、５．１サラウンドチャンネル等、任意である。
【０２２９】
また、上記実施の形態において、送信装置２１ｘ及び６１ｘとレーダ装置４０とは、別体に構成されていたが、本発明は、これに限定されず、送信装置２１ｘ、６１ｘとレーダ装置４０とを、図３０に示すように、一体に構成してもよい。
【０２３０】
さらに、上記第１、第２、及び第３の実施の形態において、送信部２０、６０及びレーダ装置４０とＤＶＤレコーダ１０及びスピーカ３０ｊ、７０ｊ、８０ｊ、及び９０ｊとは、別体に構成されていた。しかし、本発明は、これに限定されず、送信部２０、６０及びレーダ装置４０とを、図３１に示すように、ＤＶＤレコーダ１０に内蔵してもよく、図３２に示すように、スピーカ３０ｊ、７０ｊ、、８０ｊ、及び９０ｊのいずれか１つに内蔵してもよい。
【０２３１】
また、上記第２及び第３実施の形態において、音響システム２、３は、レーダ装置４０によって、ユーザＵの位置を検出していた。しかし、本発明は、これに限定されず、音響システム２及び３は、レーダ装置４０によって検出した各スピーカ７０ｊ及び８０ｊの位置関係から、ユーザＵの位置関係を推測してもよい。
【０２３２】
【発明の効果】
本発明により、ランダムに配置された複数の受信装置に夫々異なる情報を送信することができる送信装置、無線通信システム、送信方法及び無線通信方法を提供することができる。
【０２３３】
また、本発明により、ランダムに配置された複数のスピーカの担当チャンネルを設定することができる音響装置、音響システム、及びチャンル設定方法を提供することができる。
【０２３４】
さらに、本発明により複数チャンネルの音声情報を無線でスピーカに送信して再生することができる音響装置、音響システム及び音声再生方法を提供することができる。
【０２３５】
また、本発明により、高音質なサラウンド効果を得ることができる音響システム及び音声再生方法を提供することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態に係る音響システムのブロック図である。
【図２】本発明の第１の実施の形態に係るＤＶＤプレーヤのブロック図である。
【図３】本発明の第１の実施の形態に係る送信装置のブロック図である。
【図４】本発明の第１の実施の形態に係るスピーカのブロック図である。
【図５】本発明の第１の実施の形態に係るレーダ装置のブロック図である。
【図６】本発明の第１の実施の形態に係る検出器のブロック図である。
【図７】本発明の第１の実施の形態に係る位置検出部のメモリに格納されている検出テーブルを示す図である。
【図８】スピーカとレーダ装置とが形成する角度とスピーカとレーダ装置との距離を説明するための図である。
【図９】本発明の第１の実施の形態に係る音響システムがＤＶＤに記憶されたデータを読み取り、読み取ったデータを映像データとチャンネル単位の音声データとに分離して格納する動作を示すフローチャート図である。
【図１０】本発明の第１の実施の形態に係る音響システムが各スピーカの担当チャンネルを設定する動作を示すフローチャート図である。
【図１１】本発明の第１の実施の形態に係る音響システムが５サラウンドチャンネルの音声情報を各スピーカから再生する動作を示すフローチャート図である。
【図１２】Ａは、ＤＶＤプレーヤにおいて生成されたデジタル音声信号のイメージ図であり、
Ｂは、送信装置からスピーカに送信されたパルス信号の波形図であり、
Ｃは、受信装置に入力される合成パルス信号の波形図である。
【図１３】本発明の第１の実施の形態に係る送信装置から放射されたパルス信号のＴ＝δＴ２ｌにおける波面を説明するための図である。
【図１４】本発明の第１の実施の形態に係る送信装置から放射されたパルス信号のＴ＝ＴＭＡＸ／２における波面を説明するための図である。
【図１５】Ａは、受信装置に入力されたパルス信号の波形図であり、Ｂは、受信装置において復調されたデジタル音声信号のイメージ図である。
【図１６】本発明の第２の実施の形態に係る音響システムのブロック図である。
【図１７】本発明の第２の実施の形態に係る送信装置のブロック図である。
【図１８】本発明の第２の実施の形態に係るスピーカのブロック図である。
【図１９】本発明の第２の実施の形態に係る音響システムがユーザの位置を検出するとともに、各スピーカの担当チャンネルを設定する動作を示すフローチャート図である。
【図２０】本発明の第２の実施の形態に係る音響システムが各スピーカの出力レベルを設定する動作を示すフローチャート図である。
【図２１】本発明の第２の実施の形態に係る音響システムが５サラウンドチャンネルの音声データを、設定された出力レベルの下、各スピーカから再生する動作を示すフローチャート図である。
【図２２】本発明の第３の実施の形態に係る音響システムのブロック図である。
【図２３】本発明の第３の実施の形態に係るスピーカのブロック図である。
【図２４】本発明の第３の実施の形態に係る音響システムが、各スピーカをユーザの方向を向くように回転させ、該回転させたスピーカから５サラウンドチャンネルの音声データを再生する動作を示すフローチャート図である。
【図２５】本発明の第４の実施の形態に係る音響システムのブロック図である。
【図２６】本発明の第４の実施の形態に係るスピーカのブロック図である。
【図２７】本発明の第４の実施の形態に係る位置検出部のメモリに格納されている検出テーブルを示す図である。
【図２８】本発明の第４の実施の形態に係る音響システムがユーザ及びスピーカの位置を検出する動作を示すフローチャート図である。
【図２９】本発明の第４の実施の形態に係る音響システムがセンタチャンネルと設定されたスピーカを特定するとともに、他のスピーカの担当チャンネルを設定する動作を示すフローチャート図である。
【図３０】本発明の実施の形態に係る送信装置とレーダ装置とを一体に構成した装置のブロック図である。
【図３１】本発明の実施の形態に係る送信部とレーダ装置とシステム制御装置とを内蔵したＤＶＤプレーヤのブロック図である。
【図３２】本発明の実施の形態に係る送信部とレーダ装置とシステム制御装置とを内蔵したスピーカのブロック図である。
【符号の説明】
１…音響システム、１０…ＤＶＤプレーヤ、２０…送信部、２１…送信装置、２１１…音声データバッファ、２１２…パルス生成部、２１３…送信アンテナ、３０…スピーカ、３１２…復調部、４０…レーダ装置、４１…検出器、４１１…同期信号源、４１２…パルス生成部、４１３…アンテナ、４１５…同期信号検出部、４２…位置検出部、５０…システム制御装置、２…音響システム、６０…送信部、６１…送信装置、６１１…加算器、７０…スピーカ、７１１…多重化信号分離部、７２…出力レベル設定部、３…音響システム、８０…スピーカ、８１…方向設定部、４…音響システム、９０…スピーカ、９１…通信装置、９１１…同期信号源、９１２…パルス生成部、９２…スピーカ制御装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transmission device, a wireless communication system, an audio device, an audio system, a transmission method, a wireless communication method, a channel setting method, and a sound reproduction method.
[0002]
[Prior art]
In recent years, with the spread of DVDs (Digital Versatile Discs), the spread of home theater sound systems has been spreading. In the home theater sound system, the surround channels (ch) are stereo-converted into a total of 5 channels, and a low-frequency sound effect channel is added by 0.1 ch, so that a total of 5.1 ch of sound is independently reproduced. As a result, the same high-quality sound surround effect as in a movie theater can be obtained at home, and the user can enjoy the power and realism as if he were in a movie theater (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-145063 A (page 2, FIG. 5).
[0004]
[Problems to be solved by the invention]
However, in the conventional home theater sound system, the speaker and the DVD player are connected by a wired line, and if this connection is incorrect, sound cannot be reproduced accurately.
[0005]
In order to obtain a high-quality sound surround effect, it is desirable to arrange the speakers in a substantially circular shape around the user. However, in reality, the location where each speaker can be placed is determined to some extent due to restrictions such as the shape and size of the room, and it has been difficult to arrange such a speaker.
[0006]
When the speakers cannot be arranged in a substantially circular shape as described above, it is necessary for the user to manually adjust the output level from each speaker in order to obtain a high sound quality surround effect. However, such adjustment of the output level of the speaker is a very complicated operation, and therefore, only a highly skilled user can obtain a high-quality sound surround effect.
[0007]
Even if the speaker arrangement and output level are appropriate, a high sound quality surround effect cannot be obtained unless the user is at an appropriate position.
[0008]
The present invention has been made in order to solve the above-mentioned problem, and is a transmitting apparatus, a wireless communication system, a transmitting method, and a wireless communication method capable of transmitting different information to a plurality of randomly arranged receiving apparatuses. The purpose is to provide.
[0099]
Another object of the present invention is to provide an audio device, an audio system, and a channel setting method that can set a channel in charge of a plurality of speakers arranged at random.
[0010]
Still another object of the present invention is to provide an audio device, an audio system, and an audio reproduction method capable of transmitting audio information of a plurality of channels to a speaker wirelessly for reproduction.
[0011]
Another object of the present invention is to provide a sound system and a sound reproducing method capable of obtaining a high-quality surround sound effect.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a transmitting device according to a first aspect of the present invention includes:
A transmission device comprising: a first antenna and a second antenna arranged at a predetermined interval, and transmitting a pulse signal modulated in accordance with information to a reception device,
First detection means for radiating an electromagnetic wave from the first antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna;
Second detection means for radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timing. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating means;
First radiating means for radiating the pulse signal from the first antenna;
A second radiating unit that radiates the pulse signal from the second antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting unit;
It is characterized by having.
[0013]
Further, in the above configuration, the first and second detection means emit an electromagnetic wave by a UWB (Ultra Wide Band) communication method, and detect a reflected wave of the electromagnetic wave at the receiving device,
The first and second radiating means may radiate a pulse signal by a UWB communication method.
[0014]
In order to achieve the above object, a wireless communication system according to a second aspect of the present invention includes:
A transmitting device that includes first and second antennas that are arranged at a predetermined interval and that transmits a pulse signal modulated in accordance with information according to information; and a receiving device that receives the transmitted pulse signal and receives the received pulse. A receiving device that demodulates a signal into the information and outputs the information,
The transmitting device emits an electromagnetic wave from the first antenna, and a first detection unit that detects a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna,
Second detection means for radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating means;
First radiating means for radiating the pulse signal from the first antenna;
A second radiating unit that radiates the pulse signal from the second antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting unit;
The receiving device determines a threshold value of the input signal to determine, from the input signal, a pulse signal radiated from the first radiating unit and a pulse signal radiated from the second radiating unit. And extracting demodulated information from the extracted composite pulse signal while extracting the composite pulse signal, and demodulating means for outputting the demodulated information.
It is characterized by the following.
[0015]
Further, in the above configuration, the threshold may be set to be larger than the amplitude of each pulse of the pulse signal emitted from the first and second radiating units and smaller than the amplitude of the composite pulse signal. .
[0016]
Further, in the above configuration, the first and second detection means emit an electromagnetic wave by a UWB communication system, and detect a reflected wave of the electromagnetic wave at the receiving device,
The transmitting device and the receiving device may perform wireless communication by a UWB communication method.
[0017]
To achieve the above object, an acoustic device according to a third aspect of the present invention includes:
An audio device comprising first and second antennas arranged at predetermined intervals, converting audio information of a plurality of channels into a pulse signal, and transmitting the pulse signal to a speaker,
First detection means for radiating an electromagnetic wave from the first antenna and detecting a reflected wave of each electromagnetic wave at each speaker from the electromagnetic wave input to the first antenna;
Second detection means for radiating electromagnetic waves from the second antenna and detecting reflected waves of the electromagnetic waves at the speakers from the electromagnetic waves input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
Angle calculation means for calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation means,
Assigned channel setting means for setting a channel assigned to each speaker based on the calculated angle,
It is characterized by having.
[0018]
Further, in the above configuration, a difference period calculating means for calculating a first and a second difference period by subtracting a period until the electromagnetic waves radiated from the first and second antennas reach each speaker from a predetermined value. When,
Storage means for storing the first and second difference periods for each speaker in association with the assigned channel of each speaker set by the channel setting means;
A first radiating unit that converts audio information of a corresponding assigned channel into a pulse signal at a timing after the first difference period from a predetermined timing, and radiates the converted pulse signal from the first antenna;
A second radiating means for radiating the same pulse signal as the pulse signal radiated by the first radiating means from the second antenna at a timing after the second differential period from a predetermined timing. You may.
[0019]
Further, in the above configuration, the first and second detection means emits an electromagnetic wave by UWB communication method, and detects a reflected wave of the electromagnetic wave at the speaker,
The first and second radiating means may radiate a pulse signal by a UWB communication method.
[0020]
To achieve the above object, an acoustic system according to a fourth aspect of the present invention includes:
An audio device that includes first and second antennas that are arranged at predetermined intervals and converts audio information of a plurality of channels into a pulse signal and transmits the pulse signal to a speaker; And a plurality of speakers for demodulating and reproducing the audio information from the pulse signal obtained,
The acoustic device radiates an electromagnetic wave from the first antenna, and detects a reflected wave of each of the electromagnetic waves at each speaker from the electromagnetic wave input to the first antenna;
Second detection means for radiating electromagnetic waves from the second antenna and detecting reflected waves of the electromagnetic waves at the speakers from the electromagnetic waves input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
Angle calculation means for calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation means,
Assigned channel setting means for setting a channel assigned to each speaker based on the calculated angle.
It is characterized by the following.
[0021]
Further, in the above configuration, the acoustic device calculates first and second difference periods by subtracting a period until electromagnetic waves radiated from the first and second antennas reach each speaker from a predetermined value. Means for calculating a difference period,
Storage means for storing the first and second difference periods for each speaker in association with the assigned channel of each speaker set by the channel setting means;
A first radiating unit that converts audio information of a corresponding assigned channel into a pulse signal at a timing after the first difference period from a predetermined timing, and radiates the converted pulse signal from the first antenna;
A second radiating means for radiating the same pulse signal as the pulse signal radiated by the first radiating means from the second antenna at a timing after the second differential period from a predetermined timing. ,
The speaker determines a threshold value of the input signal to synthesize a pulse signal radiated from the first radiating unit and a pulse signal radiated from the second radiating unit from the input signal. Demodulating means for extracting a pulse signal and demodulating the audio information from the extracted synthesized pulse signal;
Audio information output means for outputting audio information demodulated by the demodulation means.
[0022]
Further, in the above configuration, the threshold may be set to be larger than the amplitude of each pulse of the pulse signal radiated from the first and second radiating means and smaller than the amplitude of the composite pulse signal. .
[0023]
Further, in the above configuration, the acoustic device calculates a distance between the acoustic device and each speaker from the period calculated by the arrival period calculating unit, and calculates a distance between the calculated distance and the angle calculated by the angle calculating unit. Position detection means for detecting the position of each speaker;
The apparatus may further include a user position estimating means for estimating a position of the user based on the position of each speaker detected by the position detecting means.
[0024]
Further, in the above configuration, the distance R between the acoustic device and each speaker and the angle θ formed by the acoustic device and each speaker are such that the predetermined interval is 2D, the speed of the electromagnetic wave is V, and the first When the period until the electromagnetic wave radiated from the antenna reaches each speaker is T1, and the period until the electromagnetic wave radiated from the second antenna reaches each speaker is T2, it is defined by the following equation. Is also good.
(Equation 4)

(Equation 5)

[0025]
Further, in the above configuration, the first detection means emits an electromagnetic wave from the first antenna, and detects a reflected wave of a user and each speaker of the electromagnetic wave from each of the electromagnetic waves input to the first antenna,
The second detection means emits an electromagnetic wave from the second antenna, and detects a reflected wave of the electromagnetic wave at a user and each speaker from the electromagnetic wave input to the second antenna,
The arrival period calculating unit measures a timing at which an electromagnetic wave is radiated from the first and second antennas and a timing at which a reflected wave is detected by the first and second detecting units, and calculates the timing based on the measured timing. Calculating a period until the electromagnetic waves radiated from the first and second antennas reach the user and each speaker,
The angle calculation unit calculates an angle formed by the audio device with the user and each speaker from the period calculated by the arrival period calculation unit,
The position detecting means calculates the distance between the audio device and the user and each speaker from the period calculated by the arrival time calculating means, and calculates the distance between the user and each of the users based on the calculated distance and the angle calculated by the angle calculating means. Detect the position with the speaker,
The user position estimating means may estimate the position of the user based on a positional relationship between the user and each speaker detected by the position detecting means.
[0026]
Further, in the above configuration, the user position estimating means forms the distance between the audio device and the user and each speaker calculated by the position detecting means and the audio device, the user and each speaker calculated by the angle calculating means. An average value with the angle to be calculated may be calculated, and the position of the user may be estimated from a distance and an angle approximating the calculated average value.
[0027]
Further, in the above configuration, the audio device further includes a position notification signal generating unit that generates a position notification signal that notifies each speaker of the estimated position of the user and the detected position of each speaker,
The first and second radiating means converts a multiplexed signal obtained by multiplexing the generated position notification signal and the audio information into a pulse signal, and radiates the converted pulse signal;
The demodulation unit includes a first separation unit that receives the radiated pulse signal, and separates a multiplexed signal obtained by demodulation into a position indication signal and audio information,
The speaker may further include a rotating unit that sets an output direction of the speaker based on the separated position notification signal and rotates in the set output direction.
[0028]
Further, in the above configuration, the audio device, distance calculation means for calculating the distance between the user and each speaker from the estimated position of the user and the detected position of each speaker,
Output level setting means for setting an output level of each speaker based on the distance between the user and each speaker calculated by the distance calculation means, and generating an output level instruction signal for instructing each speaker of the set output level; And further comprising
The first and second radiating means convert a multiplexed signal obtained by multiplexing the generated output level indication signal and the audio information into a pulse signal, and radiate the converted pulse signal. ,
The demodulation unit includes a second separation unit that receives the emitted pulse signal, and separates a multiplexed signal obtained by demodulation into an output level instruction signal and audio information.
The speaker includes an output level setting unit that sets an output level of audio information based on the separated output level instruction signal,
The audio information output means may output the separated audio information under the set output level.
[0029]
In the above configuration, the distance L between the user and each speaker is Ru, the distance between the audio device and the user U is θ, the angle formed between the audio device and the user U is θu, and the distance between the audio device and each speaker is R may be defined by the following equation, where θ is an angle formed between the acoustic device and each speaker.
(Equation 6)

[0030]
Further, in the above configuration, the first and second detection means emits an electromagnetic wave by UWB communication, and detects a reflected wave of the electromagnetic wave from the user and / or the speaker,
The audio device may transmit a pulse signal to each speaker by a UWB communication method.
[0031]
In order to achieve the above object, a transmission method according to a fifth aspect of the present invention includes:
A transmission method in a transmission apparatus, comprising: a first antenna and a second antenna arranged at a predetermined interval, and transmitting a pulse signal modulated in accordance with information to a reception apparatus,
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculating step of calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating step;
A first radiation step of radiating the pulse signal from the first antenna;
A second radiating step of radiating the pulse signal from the second transmitting antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting step;
It is characterized by having.
[0032]
To achieve the above object, a wireless communication method according to a sixth aspect of the present invention includes:
A transmitting device that includes first and second antennas that are arranged at a predetermined interval and that transmits a pulse signal modulated in accordance with information according to information; and a receiving device that receives the transmitted pulse signal and receives the received pulse. A receiving apparatus for demodulating a signal into the information and outputting the information, and a wireless communication method in a wireless communication system including:
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detection steps are measured. An arrival period calculating step of calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating step;
A first radiation step of radiating the pulse signal from the first antenna;
A second radiating step of radiating the pulse signal from the second transmitting antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting step;
By extracting a threshold value of the input signal, a composite pulse signal of a pulse signal radiated from the first radiation step and a pulse signal radiated from the second radiation step is extracted from the input signal. Demodulating the information from the extracted synthesized pulse signal, and outputting the demodulated information;
It is characterized by having.
[0033]
In order to achieve the above object, a channel setting method according to a seventh aspect of the present invention includes:
A channel setting method in an audio device including first and second antennas arranged at predetermined intervals and converting audio information of a plurality of channels into a pulse signal and transmitting the pulse signal to a speaker,
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of each of the electromagnetic waves at each speaker from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of each electromagnetic wave at each speaker from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculation step of calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
An angle calculation step of calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation step,
An assigned channel setting step of setting a channel assigned to each speaker based on the calculated angle,
It is characterized by having.
[0034]
In order to achieve the above object, a sound reproducing method according to an eighth aspect of the present invention comprises:
An audio device that includes first and second antennas that are arranged at predetermined intervals and converts audio information of a plurality of channels into a pulse signal and transmits the pulse signal to a speaker; And a plurality of speakers for demodulating and reproducing the audio information from the pulse signal, and a method for reproducing audio in an audio system including:
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of each of the electromagnetic waves at each speaker from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of each electromagnetic wave at each speaker from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculation step of calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
An angle calculation step of calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation step,
An assigned channel setting step of setting a channel assigned to each speaker based on the calculated angle,
A difference period calculation step of calculating a first and second difference period by subtracting a period until an electromagnetic wave radiated from the first and second antennas reaches each speaker from a predetermined value;
A storing step of storing the first and second difference periods in each speaker in association with a channel assigned to each speaker set in the channel setting step;
A first radiating step of converting audio information of a corresponding assigned channel into a pulse signal at a timing after the first difference period from a predetermined timing, and radiating the converted pulse signal from the first antenna;
A second radiating step of radiating the same pulse signal as the pulse signal radiated by the first radiating step from the second antenna at a timing after the second differential period from a predetermined timing;
By extracting a threshold value of the input signal, a composite pulse signal of a pulse signal radiated from the first radiation step and a pulse signal radiated from the second radiation step is extracted from the input signal. And demodulating the audio information from the extracted synthesized pulse signal;
Audio information output step of outputting audio information demodulated by the demodulation step,
It is characterized by having.
[0035]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
An acoustic system 1 according to a first embodiment of the present invention will be described with reference to the drawings.
[0036]
As shown in FIG. 1, the audio system 1 is arranged at a position substantially the same as a DVD (Digital Versatile Disc) player 10 and the DVD player 10, and is a digital audio signal A (AC, AL, 5) of five surround channels (ch). AR, AS1, ASr) by a UWB (Ultra Wide Band) communication system, and speakers 301 to 305, which receive the digital audio signal A transmitted by the transmitting unit 20, convert the analog signal into an analog signal, and output it. , The radar device 40 and the system control device 50 arranged at substantially the same positions as the DVD player 10 and the transmission unit 20.
[0037]
The UWB communication system is a technology for communicating using an extremely wide frequency band (ultra-wide band). A signal composed of a pulse (impulse) train having a very fine pulse width (for example, 1 ns or less) is used without using a carrier wave. This is a communication method for transmitting information by using.
[0038]
A first merit of the UWB communication method is that more information can be transmitted per unit time by using an impulse. For example, if a pulse having a pulse width of 1 ns is used, for example, one billion data (one gigabit data) can be transmitted per second.
[0039]
A second merit of the UWB communication method is that since a pulse is transmitted without using a carrier, power consumption on the transmission side can be reduced. This is because, when a carrier is used, the transmitting side must constantly transmit radio waves, whereas when a carrier is not used, a voltage or the like may be applied only at the timing of transmitting a pulse.
[0040]
A third merit of the UWB communication method is that the communication is performed using an extremely wide frequency band, so that it is hardly affected by noise. For example, even if noise occurs in a certain frequency component, only a part of the frequency component constituting the impulse is affected. Therefore, on the receiving side, there is almost no inconvenience in receiving information (for example, determining a 1-bit data value).
[0041]
As shown in FIG. 2, the DVD player 10 includes a data reading unit 11, a data processing unit 12, a video decoder 13, a video data buffer 14, a video output unit 15, and an audio decoder 16. . The DVD player 10 starts a DVD reproduction operation in response to a reproduction instruction signal supplied from a system control device 50 described later.
[0042]
The data reading unit 11 reads data recorded on the DVD, amplifies the read data signal, converts the data signal into a data bit stream, and supplies the data bit stream to the data processing unit 12.
[0043]
The data processing unit 12 detects a packet header in the data bit stream supplied from the data reading unit 11, and identifies the type of the packet based on the detected packet header. The data processing unit 12 separates the data bit stream into video data bit stream packets and audio data bit stream packets based on the type of the packet, and outputs the video data bit stream to the video decoder 13 and the audio data bit stream. Each is supplied to the audio decoder 14.
[0044]
The video decoder 13 performs a decoding process on the video data bit stream supplied from the data processing unit 12 to generate and output a digital video signal V.
[0045]
The video data buffer 14 is composed of a RAM (Random Access Memory) or the like, stores the digital video signal V output from the video decoder 13, and uses a video output instruction signal VO supplied from a system control device 50 described later as a trigger. The digital video signal V to be stored is supplied to the video output unit 15.
[0046]
The video output unit 15 converts the digital video signal V supplied from the video data buffer 14 into an analog signal and outputs it.
[0047]
The audio decoder 16 performs a decoding process on the audio data bit stream supplied from the data processing unit 12, and performs five surround channels, that is, a center channel (Cch), a left channel (Lch), a right channel (Rch), and a surround left channel. (Slch) and digital audio signals AC, AL, AR, ASl, and ASr of a surround right channel (Srch).
[0048]
The audio decoder 16 includes five output terminals 161C, 161L, 161R, 161Sl, and 161Sr, and outputs the generated digital audio signal Ax (x = C, L, R, S1, Sr) from the corresponding output terminal 161x. Output.
[0049]
The transmission unit 20 illustrated in FIG. 1 includes transmission devices 21C, 21L, 21R, 21Sl, and 21Sr connected to five output terminals 161x, respectively.
[0050]
As shown in FIG. 3, the transmission device 21x includes two audio data buffers 211x1 and 211x2, two pulse generation units 212x1 and 212x2, and two transmission antennas 213x1 arranged at a predetermined interval 2D. And 213x2.
[0051]
When the audio output instruction signal AOxi (i = 1, 2) is supplied from the system control device 50, the transmission device 21x generates and generates a pulse signal Px position-modulated according to 0/1 of the digital audio signal Ax. The transmitted pulse signal Px is transmitted to the speaker 30j (j = 1, 2, 3, 4, 5) by the UWB communication method.
[0052]
The audio data buffer 211xi is composed of a RAM or the like, and stores the digital audio signal Ax output from the audio decoder 16. The audio data buffer 211xi supplies a digital audio signal Ax, which is stored using the audio output instruction signal AOxi supplied from the system control device 50 as a trigger, to the pulse generation unit 212xi.
[0053]
The pulse generation unit 212xi performs a position modulation (Pulse Position Modulation) on a pulse having an amplitude m according to 0/1 of the digital audio signal AOxi output from the audio data buffer 211xi to generate an electric pulse signal Px.
[0054]
The transmission antenna 213xi converts the electric pulse signal Px generated in the pulse generation unit 212xi into an electromagnetic pulse signal, and transmits the converted electromagnetic pulse signal to the speaker 30j without using a carrier.
[0055]
As shown in FIG. 4, the speaker 30j includes a receiving device 31j and an audio output unit 32j.
[0056]
The receiving device 31j includes a receiving antenna 311j and a demodulation unit 312j, receives the pulse signal Px transmitted from the transmission unit 20, demodulates the received pulse signal Px into an original digital audio signal Ax, and outputs the signal. I do.
[0057]
The receiving antenna 311j receives the electromagnetic pulse signal transmitted from the transmitting unit 20, and converts the received electromagnetic pulse signal into an electric pulse signal Px.
[0058]
The demodulation unit 312j compares the magnitude of each pulse of the electric pulse signal Px converted by the receiving antenna 311j with a predetermined threshold value t (m <t <2m) to determine the presence or absence of a pulse. The electric pulse signal Px is demodulated into the original digital audio signal Ax based on the electric pulse signal Px and output.
[0059]
The audio output unit 32j converts the digital audio signal Ax output from the receiving device 31j into an analog audio signal, amplifies the converted analog signal, and outputs the amplified analog signal.
[0060]
As shown in FIG. 5, the radar device 40 includes two detectors 411 and 412, and a position detection unit 42, and receives a speaker 30j according to a position detection instruction signal supplied from a system control device 50 described later. Starts the position detection operation.
[0061]
As shown in FIG. 6, the detector 41k (k = 1, 2) includes a synchronization signal source 411k, a pulse generator 412k, an antenna 413k, a comparator 414k, and a synchronization signal detector 415k. I have. Further, the antennas 413k of the detector 41k are arranged apart from each other by a predetermined interval 2D.
[0062]
The detector 41k emits a pulse signal Pk generated by performing amplitude modulation (Pulse Amplitude Modulation) according to 0/1 of the synchronization signal Sk (k = 1, 2) into the air. The detector 41k receives the pulse signal reflected by the speaker 30j, and detects a synchronization signal from the received pulse signal.
[0063]
The synchronization signal source 411k generates and outputs a synchronization signal Sk by arranging 0/1 in a predetermined pattern. The pulse generator 412k generates an electric pulse signal Pk by amplitude-modulating a pulse according to 0/1 of the synchronization signal Sk output from the synchronization signal source 411k.
[0064]
The antenna 413k converts the electric pulse signal Pk generated by the pulse generator 412k into an electromagnetic pulse signal, and emits the converted electromagnetic pulse signal into the air. Further, the antenna 413k receives the electromagnetic pulse signal reflected by the speaker 30j, and converts the received electromagnetic pulse signal into an electric pulse signal Pk.
[0065]
The comparator 414k is composed of an operational amplifier and the like, and is slightly offset by applying a voltage to the negative input terminal. The comparator 414k compares the magnitude of each pulse of the electric pulse signal Pk converted by the antenna 413k with a predetermined threshold to determine the presence or absence of a pulse, and converts the electric pulse signal Pk into a digital signal based on the result of the determination. Convert and output.
[0066]
The synchronization signal detector 415k detects the synchronization signal Sk from the digital signal output from the comparator 414k. Upon detecting the synchronization signal Sk, the synchronization signal detection unit 415k supplies a synchronization detection signal to the system control device 50.
[0067]
The position detection unit 42 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and the like. Further, the memory includes a detection table shown in FIG.
[0068]
The position detection unit 42 uses a clock circuit to measure the timing T0 at which the detector 41k emits the pulse signal, and stores the measured timing T0 in the detection table.
[0069]
When the synchronization detection signal is supplied from the detector 411, the position detection unit 42 measures the supplied timing and stores the measured timing T11 (l = 1, 2, 3, 4, 5) in the detection table. I do. Similarly, when the synchronization detection signal is supplied from the detector 412, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing T21 in the detection table.
[0070]
The position detector 42 detects the detection period ΔT11 (= T11−T0) of the detector 411 from the timing T0 and the timing T11 stored in the detection table, and detects the detector 412 from the timing T0 and the timing T21 stored in the detection table. The period ΔT21 (= T21-T0) is calculated and stored in the detection table.
[0071]
The position detection unit 42 calculates the distance R11 (= V · ΔT11 / 2) between the detector 411 and each speaker 30j from the calculated detection period ΔT11 and the transmission speed V of the electromagnetic pulse signal stored in the ROM or the like. From the detection period ΔT21 and the transmission speed V of the electromagnetic pulse signal, a distance R21 (= V · ΔT21 / 2) between the detector 412 and each speaker 30j is calculated.
[0072]
The position detection unit 42 substitutes the calculated distances R11 and R21 into the following Expressions 7 and 8, and calculates the cosine cos θl of the angle θl formed by the radar device 40 and each speaker 30j shown in FIG. , The distance Rl between the radar device 40 and each speaker 30j is calculated and stored in the detection table.
(Equation 7)

(Equation 8)

[0073]
The system control device 50 includes a CPU, a RAM, a ROM, and the like, and supplies a reproduction instruction signal to the DVD player 10 and a position detection instruction signal to the radar device 40 when an instruction to reproduce a DVD is issued from an instruction unit (not shown). I do.
[0074]
The system control device 50 sets the Rch speaker, the Srch speaker, the Cch speaker, the Sch speaker, and the Lch speaker in order from the speaker 30j having the smaller angle θl obtained by the position detector 42, that is, from the speaker 30j having the larger cosine cosθl calculated. Set.
[0075]
The system control device 50 searches the detection period ΔT11 and the detection period ΔT21 stored in the detection table of the position detection unit 42 for the longest detection period ΔTMAX. The system control device 50 obtains δT11 (= (ΔTMAX−ΔT11) / 2) from the retrieved longest detection period ΔTMAX and each detection period ΔT11, and δT21 (= (ΔTMAX−ΔT21) from the longest detection period ΔTMAX and each detection period ΔT21. ) / 2) are calculated respectively.
[0076]
The system control device 50 sets the predetermined timing to T = 0, and when T = δT11, supplies the audio output instruction signal AOx1 to the audio data buffer 211x1 of the corresponding channel xch, and when T = δT21, the corresponding channel The audio output instruction signal AOx2 is supplied to the audio data buffer 211x2 of xch. When T = ΔTMAX / 2, the system controller 50 supplies the video output instruction signal VO to the video data buffer 14 of the DVD player 10.
[0077]
Next, the reproduction operation of the audio system 1 having the above configuration will be described with reference to the flowcharts shown in FIGS. 9, 10, and 11. FIG. This playback operation is an operation of detecting the position of the speaker 30j, setting a channel assigned to the speaker 30j, transmitting an audio signal of the set channel to the speaker 30j, and playing back a DVD. The DVD reproduction operation is started when the user instructs the system control device 50 to reproduce the DVD at the instruction section.
[0078]
First, an operation of reading data stored in a DVD and separating and storing the read data into video data and audio data in channel units will be described with reference to a flowchart shown in FIG.
[0079]
When a user instructs reproduction of a DVD, the system control device 50 supplies a reproduction instruction signal to the DVD player 10.
[0080]
When the reproduction instruction signal is supplied, the DVD player 10 reads the data recorded on the DVD in the data reading unit 11 (step S901), amplifies the read data signal, and converts it into a data bit stream. In the DVD player 10, the data processing unit 12 separates the converted data bit stream into a video data bit stream and an audio data bit stream.
[0081]
In the DVD player 10, the video decoder 13 performs a decoding process on the video data bit stream to generate a digital video signal V. In addition, the DVD player 10 performs a decoding process on the audio data bit stream supplied from the data processing unit 12 in the audio decoder 16, and outputs digital audio signals AC, AL, AR, and Cch, Lch, Rch, Slch, and Srch. ASl and ASr are generated (step S902).
[0082]
The DVD player 10 stores the generated digital video signal V in the video data buffer 14. The DVD player 10 supplies the generated digital audio signal Ax (x = C, L, R, S1, Sr) to the corresponding transmission devices 21C, 21L, 21R, 21S1, and 21Sr, respectively. The transmission device 21x stores the digital audio signal Ax supplied from the DVD player 10 in the audio data buffer 211x1 and the audio data buffer 211x2 (step S903).
[0083]
Next, the operation of detecting the position of each speaker 30j and setting the assigned channel of each speaker 30j based on the detected position will be described with reference to the flowchart shown in FIG.
[0084]
When the user instructs the reproduction of the DVD, the system control device 50 supplies a position detection instruction signal to the radar device 40.
[0085]
When the position detection instruction signal is supplied, the two detectors 41k (k = 1, 2) constituting the radar device 40 amplitude-modulate the pulse in accordance with 0/1 of the synchronization signal Sk, and convert the pulse signal Pk. It is generated (step S1001).
[0086]
The radar device 40 emits the pulse signal P1 generated by the detector 411 and the pulse signal P2 generated by the detector 412 into the air at the same timing T0 (step S1002).
[0087]
The position detection unit 42 stores the timing T0 at which the detector 41k emits the pulse signal Pk into the air in the detection table (Step S1003).
[0088]
The detector 41k receives the pulse signal Pk reflected by the speaker 30j, and converts the received pulse signal Pk into a digital signal (Step S1004).
[0089]
The detector 41k detects the synchronization signal Sk from the converted digital signal in the synchronization signal detection unit 415k (step S1005). When detecting the synchronization signal Sk (YES in step S1005), the detector 41k supplies the position detection unit 42 with the synchronization detection signal.
[0090]
The position detector 42 measures the timing at which the synchronization detection signal is supplied from the detector 411, and stores the measured timing T11 (l = 1, 2, 3, 4, 5) in the detection table. Similarly, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing T21 in the detection table (step S1006).
[0091]
The position detection unit 42 detects the detection period ΔT11 (= T11−T0) of the detector 411 from the timing T0 and the timing T11 stored in the detection table, and detects the detection period of the detector 412 from the timing T0 and the timing T21 stored in the memory 421. The period ΔT21 (= T21−T0) is calculated and stored in the detection table (step S1007).
[0092]
The position detector 42 detects the distance R11 (= V · ΔT11 / 2) between the detector 411 and each speaker 30j from the calculated detection period ΔT11 and the transmission speed V of the electromagnetic pulse signal stored in the ROM or the like. From the period ΔT21 and the transmission speed V of the electromagnetic pulse signal, a distance R21 (= V · ΔT21 / 2) between the detector 412 and each speaker 30j is calculated (step S1008).
[0093]
The position detection unit 42 calculates the cosine cos θl of the angle θl (0 ≦ θl ≦ π) formed by the radar device 40 and each speaker 30j from the calculated distances R11 and R21 and stores the cosine cos θl in the detection table (step S1009). ).
[0094]
The system control device 50 sets the Rch speaker, the Srch speaker, the Cch speaker, the Slch speaker, and the Lch speaker in order from the speaker 30j having the smaller angle θl obtained by the position detector 42, that is, from the speaker 30j having the larger calculated cosine cosθl. It is set (step S1010).
[0095]
Next, an operation of transmitting the audio data of the channel corresponding to the speaker 30j to which the channel is set by the wireless communication method and reproducing the transmitted audio data from each speaker 30j will be described with reference to a flowchart shown in FIG. .
[0096]
The system control device 50 searches the detection period ΔT11 and the detection period ΔT21 stored in the detection table of the position detection unit 42 for the longest detection period ΔTMAX (step S1101).
[0097]
The system control device 50 obtains δT11 (= (ΔTMAX−ΔT11) / 2) from the retrieved longest detection period ΔTMAX and each detection period ΔT11, and δT21 (= (ΔTMAX−ΔT21) from the longest detection period ΔTMAX and each detection period ΔT21. ) / 2) are calculated respectively (step S1102).
[0098]
The system control device 50 sets the predetermined timing to T = 0, and when T = δT11 (YES in step S1103), supplies the audio output instruction signal AOx1 to the audio data buffer 211x1 of the transmission device 21x of the corresponding channel xch. I do. When T = δT2l (YES in step S1103), system controller 50 supplies audio output instruction signal AOx2 to audio data buffer 211x2.
[0099]
Upon receiving the audio output instruction signal AOxi, the transmission device 21x outputs the digital audio signal Ax stored in the audio data buffer 211xi (step S1104).
[0100]
In the transmission device 21x, the pulse generation unit 212xi generates a pulse signal Px shown in FIG. 12B by position-modulating a pulse having an amplitude m according to, for example, 0/1 of the digital audio signal Ax shown in FIG. 12A (step S1105). .
[0101]
As illustrated in FIG. 13, the transmission device 21x converts the pulse signal Px generated by the pulse generation unit 212x1 and the pulse signal Px generated by the pulse generation unit 212x2 into | δT21-δT11 | (= | ΔT11-ΔT21 / 2). The light is emitted into the air at a timing different by |) (step S1106).
[0102]
The two pulse signals Px radiated into the air at a timing different by | ΔT11−ΔT21 / 2 | are separated from the transmission device 21x by the distance Rl at T = TMAX as shown in FIG. 21x and the position of the speaker 30j where the corresponding channel chx is set, that is, the position where the angle θl is formed, that is, the position of the speaker 30j is set, and mutually strengthened.
[0103]
Therefore, at T = TMAX / 2, the composite pulse signal 2Px having an amplitude of 2 m shown in FIG. 12C is input to the receiving device 31j of the speaker 30j (step S1107).
[0104]
The receiving device 31j of the speaker 30j compares the magnitude of each pulse of the received pulse signal shown in FIG. 15A with a predetermined threshold value t (m <t ≦ 2m) in the demodulation unit 312j, and synthesizes a composite pulse from the received pulse signal. The signal 2Px is extracted. The receiving device 31j demodulates the extracted composite pulse signal 2Px into the original digital audio signal Ax shown in FIG. 15B (step S1108).
[0105]
The speaker 30j converts the demodulated digital audio signal Ax into an analog audio signal in the audio output unit 32j, and amplifies and outputs the converted analog signal to reproduce audio data (step S1109).
[0106]
When T = TMAX / 2, the system control device 50 supplies the DVD player 10 with the video output instruction signal VO. Upon receiving the video output instruction signal VO, the DVD player 10 outputs a digital video signal V stored in the video data buffer 14, converts the output digital video signal V into an analog audio signal, and converts the converted analog audio signal. And reproduce the video data.
[0107]
By the above-described reproduction operation, the sound system 1 can detect the positions of the speakers 30j arranged at random, and can set a channel (xch) assigned to each speaker 30j based on the detected positions.
[0108]
Further, the sound system 1 can transmit the audio signal Ax of the corresponding channel (xch) to the speaker 30j in which the assigned channel (xch) is set by a wireless communication method. Further, the audio system 1 can reproduce the video data and the audio data of each channel at the same timing (T = TMAX / 2).
[0109]
(Second embodiment)
An acoustic system 2 according to a second embodiment of the present invention will be described with reference to the drawings. The description of the same configuration as that of the acoustic system 1 according to the first embodiment will be omitted.
[0110]
As shown in FIG. 16, the audio system 2 includes a DVD player 10, a transmission unit 60, speakers 701 to 705, a radar device 40, and a system control device 50.
[0111]
The transmitting unit 60 is configured by transmitting devices 61C, 61L, 61R, 61Sl, and 61Sr connected to the five output terminals 161x, respectively. As illustrated in FIG. 17, the transmission device 61x includes audio data buffers 211x1 and 211x2, two adders 611x1 and 611x2, pulse generation units 212x1 and 212x2, and transmission antennas 213x1 and 213x2. Then, an output level instruction signal ALx and an audio output instruction signal AOx are supplied from the system controller 50.
[0112]
The adder 611xi adds the output level instruction signal ALxi supplied from the system control device 50 and the digital audio signal Ax supplied from the audio data buffer 211 to generate and output a multiplexed signal Mx.
[0113]
As shown in FIG. 18, the speaker 70j includes a reception device 71j, an output level setting unit 72j, and an audio output unit 32j. The reception device 71j includes a reception antenna 311j, a demodulation unit 312j, and a multiplexing unit. And a signal separation unit 711j.
[0114]
The multiplexed signal separating section 711j separates the multiplexed signal Mx demodulated in the demodulating section 312j into an output level instruction signal ALx and a digital audio signal Ax, and outputs the output level instruction signal ALx to the output level setting section 72j. The audio signal Ax is supplied to the audio output unit 32j.
[0115]
Output level setting section 72j sets the amplification degree of audio output section 32j based on output level instruction signal ALx supplied from multiplexed signal separation section 711j.
[0116]
The audio output unit 32j converts the digital audio signal Ax output from the receiving device 71j into an analog audio signal, amplifies the converted analog signal under the amplification set by the output level setting unit 72j, and outputs the amplified analog signal.
[0117]
The radar device 40 includes a detector 41k and a position detection unit 42, and detects the position of the speaker 70j and the position of the user U according to a position detection instruction signal supplied from the system control device 50.
[0118]
The position detection unit 42 measures the timing T0 at which the detector 41k of the radar device 40 emits the pulse signal Pk using a clock circuit, and stores the measured timing T0 in a detection table.
[0119]
When the synchronization detection signal is supplied from the detector 411, the position detection unit 42 measures the supplied timing, and compares the measured timing T1n (n = 1, 2, 3, 4, 5, 6) with a detection table. To be stored. Similarly, when the synchronization detection signal is supplied from the detector 412, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing T2n in the detection table.
[0120]
The position detection unit 42 detects the detection period ΔT1n (= T1n−T0) of the detector 411 from the timing T0 and the timing T1n stored in the detection table, and detects the detection period of the detector 412 from the timing T0 and the timing T2n stored in the detection table. The periods ΔT2n (= T2n−T0) are calculated respectively and stored in the detection table.
[0121]
The position detector 42 calculates the distance R1n (= V · ΔT1n / 2) between the detector 411 and the user U and each speaker 70j based on the calculated detection period ΔT1n and the transmission speed V of the electromagnetic pulse signal stored in the ROM or the like. ) Is calculated from the detection period ΔT2n and the transmission speed V of the electromagnetic pulse signal, and the distance R2n (= V · ΔT2n / 2) between the detector 412 and the user U and each speaker 70j is calculated and stored in the detection table. .
[0122]
The position detection unit 42 substitutes the calculated distances R1n and R2n into Equations 9 and 10 shown below, and calculates the distance Rn between the radar device 40 and the user U, the speakers 70j and the user U, The angle θn formed by the user 40 and the user U and each speaker 70j is calculated, and the calculated position parameters (Rn, θn) are stored in the detection table.
(Equation 9)

(Equation 10)

[0123]
The system control device 50 calculates the average values Rna and θna of Rn and θn stored in the detection table of the position detection unit 42, and includes Rn and θn that approximate the calculated average values Rna and θna. The position parameters are detected from the detection table, and the detected position parameters are set as the position parameters (Ru, θu) of the user U.
[0124]
The system controller 50 determines, for the position parameters (Rl, θl) (l = 1, 2, 3, 4, 5) other than the position parameter of the user U, the Rch speaker, the Srch speaker, Cch speaker, Slch speaker, and Lch speaker are set.
[0125]
The system control device 50 substitutes the position parameter (Ru, θu) of the user U and the position parameter (R1, θl) of each speaker 70j into the following equation 11 to obtain the user U and each speaker shown in FIG. The distance Ll from the distance 70j is calculated.
(Equation 11)

[0126]
The system control device 50 sets the output level of each speaker 70j based on the calculated distance Ll, and generates and generates an output level instruction signal ALx that instructs the speaker 70j to output the sound of the set output level. The supplied output level instruction signal ALx is supplied to the corresponding transmitting device 61x.
[0127]
For example, as shown in FIG. 16, when the calculated distance between the user U and the speaker 70 j is 0.9 L, the system control device 50 sets an audio output level smaller than the output level set at the distance L, and At 1.3L, an output level larger than the output level set at the distance L is set.
[0128]
Next, the reproduction operation of the audio system 2 having the above configuration will be described with reference to the flowcharts shown in FIGS. 19, 20, and 21. This reproducing operation is an operation of setting the output level of each speaker 70j based on the detected positional relationship between the user U and the speaker 70j and reproducing the DVD. The description of the same operation (operation shown in the flowchart of FIG. 9) as the reproduction operation of the audio system 1 according to the first embodiment will be omitted.
[0129]
First, an operation of detecting the positions of the user U and each speaker 70j and setting a channel in charge of each speaker 70j based on the detected positions will be described with reference to a flowchart shown in FIG.
[0130]
When the user instructs the reproduction of the DVD, the system control device 50 supplies a position detection signal to the radar device 40.
[0131]
When the position detection signal is supplied, the two detectors 41k (k = 1, 2) constituting the radar device 40 amplitude-modulate the pulse according to 0/1 of the synchronization signal Sk to generate the pulse signal Pk. (Step S1901).
[0132]
The radar device 40 emits the pulse signal P1 generated by the detector 411 and the pulse signal P2 generated by the detector 412 into the air at the same timing T0 (step S1902).
[0133]
The position detection unit 42 stores the timing T0 at which the detector 41k emits the pulse signal Pk into the air in the detection table (Step S1903).
[0134]
The detector 41k receives the pulse signal Pk reflected by the speaker 70j, and converts the received pulse signal Pk into a digital signal (Step S1904).
[0135]
The detector 41k detects the synchronization signal Sk from the converted digital signal in the synchronization signal detection unit 415k (Step S1905). When detecting the synchronization signal Sk (YES in step S1905), the detector 41k supplies the position detection unit 42 with the synchronization detection signal.
[0136]
The position detector 42 measures the timing at which the synchronization detection signal is supplied from the detector 411, and stores the measured timing T1n (n = 1, 2, 3, 4, 5, 6) in the detection table. Similarly, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing T2n in the detection table (Step S1906).
[0137]
The position detector 42 detects the detection period ΔT1n (= T1n−T0) of the detector 411 from the timing T0 and the timing T11 stored in the detection table, and detects the detector 412 from the timing T0 and the timing T2n stored in the detection table. The periods ΔT2n (= T2n−T0) are calculated respectively and stored in the detection table (step S1907).
[0138]
The position detection unit 42 detects a distance R1n (= V · ΔT1n / 2) between the detector 411 and each speaker 70j from the calculated detection period ΔT1n and the transmission speed V of the electromagnetic pulse signal stored in the ROM or the like. A distance R2n (= V · ΔT2n / 2) between the detector 412 and each speaker 70j is calculated from the period ΔT2n and the transmission speed V of the electromagnetic pulse signal (step S1908).
[0139]
The position detection unit 42 calculates the distance Rn between the radar device 40, the user U, and each speaker 70j and the user U, and the angle formed by the radar device 40, the user U, and each speaker 70j from the calculated distance R1n and distance R2n. is calculated, and the calculated position parameters (Rn, θn) are stored in the detection table (step S1909).
[0140]
The system controller 50 calculates the average values Rna and θna of Rn and θn stored in the detection table of the position detection unit 42 (Step S1910).
[0141]
The system control device 50 detects a position parameter including Rn and θn approximate to the calculated average values Rna and θna from the detection table, and sets the detected position parameter as the position parameter (Ru, θu) of the user U. (Step S1911).
[0142]
The system controller 50 determines, for the position parameters (Rl, θl) (l = 1, 2, 3, 4, 5) other than the position parameter of the user U, the Rch speaker, the Srch speaker, A Cch speaker, an Slch speaker, and an Lch speaker are set (step S1912).
[0143]
Next, the operation of calculating the distance between the user U and each speaker 70j and setting the output level of each speaker 70j based on the calculated distance will be described with reference to the flowchart shown in FIG.
[0144]
The system controller 50 calculates a distance Ll between the user U and each speaker 70j from the position parameters (Ru, θu) of the user U and the position parameters (R1, θl) of each speaker 70j (step S2001).
[0145]
The system control device 50 sets the output level of each speaker 70j based on the calculated distance Ll, and generates an output level instruction signal ALx for instructing the speaker 70j to output a sound of the set output level (step S2002).
[0146]
Then, the operation of transmitting the audio data of the channel corresponding to the speaker 70j to which the channel is set by the wireless communication method and reproducing the transmitted audio data from each speaker 70j under the set output level is described with reference to FIG. This will be described with reference to the flowchart shown in FIG.
[0147]
The system controller 50 searches for the longest detection period ΔTMAX from the detection periods ΔT11 and ΔT21 stored in the detection table (step S2101).
[0148]
The system control device 50 obtains δT11 (= (ΔTMAX−ΔT11) / 2) from the retrieved longest detection period ΔTMAX and each detection period ΔT11, and δT21 (= (ΔTMAX−ΔT21) from the longest detection period ΔTMAX and each detection period ΔT21. ) / 2) are calculated respectively (step S2102).
[0149]
The system control device 50 sets the predetermined timing to T = 0, and when T = δT11 (YES in step S2103), sends the audio output instruction signal AOx1 to the audio data buffer 211x1 of the transmission device 61x of the corresponding channel xch, The output level instruction signal ALx1 is supplied to the adder 611x1. When T = δT2l (YES in step S2103), the system control device 50 transmits the audio output instruction signal AOx2 to the audio data buffer 211x2 of the transmission device 61x2 of the corresponding channel xch, and outputs the output level instruction signal ALx2 to the adder 611x2. Supply.
[0150]
Upon receiving the audio output instruction signal AOxi, the transmitting device 61x outputs the digital audio signal Ax stored in the audio data buffer 211xi (step S2104).
[0151]
In the adder 611x, the transmission device 61x adds the output level instruction signal ALxi supplied from the system control device 50 and the digital audio signal Ax output from the audio data buffer 211xi to generate a multiplexed signal Mx (step S61). S2105).
[0152]
In the transmission device 61x, the pulse generation unit 212xi generates a multiplexed pulse signal MPx by performing position modulation on the pulse having the amplitude m in accordance with 0/1 of the multiplexed signal Mx (step S2106).
[0153]
The transmitting device 61x converts the multiplexed pulse signal MPx generated by the pulse generation unit 212x1 and the multiplexed pulse signal MPx generated by the pulse generation unit 212x2 into | δT21−δT11 | (= | ΔT11−ΔT21 / 2). The light is emitted into the air at different timings (step S2107).
[0154]
As described above, the two multiplexed pulse signals MPx radiated into the air at timings different by | ΔT11−ΔT21 / 2 | are separated from the transmission device 61x by the distance Rl at T = TMAX / 2, and are angled from the transmission device 61x. At the position where θl is formed, that is, at the position of the speaker 70j at which the corresponding channel chx is set, the phases match and reinforce each other.
[0155]
Therefore, at T = TMAX / 2, the composite multiplexed pulse signal 2MPx having an amplitude of 2 m is input to the receiving device 71j of the speaker 70j (step S2108).
[0156]
In the receiving device 71j of the speaker 70j, the demodulation unit 312 compares the magnitude of each pulse of the received pulse signal with a predetermined threshold value t (m <t ≦ 2m), and extracts the composite pulse signal 2Px from the received pulse signal. I do. The receiving device 71j demodulates the extracted combined multiplexed pulse signal 2MPx into the original multiplexed signal Mx (step S2109).
[0157]
The receiving device 71j separates the demodulated multiplexed signal Mx into an output level instruction signal ALx and a digital audio signal Ax in a multiplexed signal demultiplexing unit 711j, and outputs the output level instruction signal ALx to an output level setting unit 72 The audio signal Ax is supplied to the audio output unit 32 (Step S2110).
[0158]
The output level setting section 72j sets the amplification of the audio output section 32j based on the output level instruction signal ALx supplied from the receiving device 71j. The audio output unit 32j converts the digital audio signal Ax output from the receiving device 71j into an analog audio signal under the set amplification degree, amplifies and outputs the converted analog signal, and reproduces audio data. (Step S2111).
[0159]
When T = TMAX / 2, the system control device 50 supplies the DVD player 10 with the video output instruction signal VO. Upon receiving the video output instruction signal VO, the DVD player 10 outputs a digital video signal V stored in the video data buffer 14, converts the output digital video signal V into an analog audio signal, and converts the converted analog audio signal. And reproduce the video data.
[0160]
By the above-mentioned reproduction operation, the sound system 2 can detect the positions of the speakers 70j arranged at random, and can set a channel (xch) assigned to each speaker 70j based on the detected positions. Further, the sound system 2 can transmit the audio signal Ax of the corresponding channel (xch) to the speaker 70j in which the assigned channel (xch) is set by a wireless communication method. Further, the audio system 2 can reproduce the video data and the audio data of each channel at the same timing (T = TMAX / 2).
[0161]
Further, the sound system 2 can calculate the distance Ll between the user U and each speaker 70j and set the output level of each speaker 70j based on the calculated distance Ll. As described above, by adjusting the output level of each speaker 70j, the sound system 2 can obtain a high-quality sound surround effect.
[0162]
(Third embodiment)
An acoustic system 3 according to a third embodiment of the present invention will be described with reference to the drawings. The description of the same configuration as the acoustic system 1 and the acoustic system 2 according to the first and second embodiments is omitted.
[0163]
As shown in FIG. 22, the audio system 3 includes a DVD player 10, a transmission unit 60, speakers 801 to 805, a radar device 40, and a system control device 50.
[0164]
The position vector notification signal PVx and the audio output instruction signal AOx are supplied from the system control device 50 to the transmission device 61x of the transmission unit 60. The adder 611xi of the transmitting device 61x adds the position vector notification signal PVxi supplied from the system control device 50 and the digital audio signal Axi supplied from the audio data buffer 211xi to generate a multiplexed signal Mx. Output.
[0165]
As shown in FIG. 23, the speaker 80j includes a receiving device 71j, an audio output unit 32j, and a direction setting unit 81j. The multiplexed signal separator 711j of the receiver 71j separates the multiplexed signal Mx demodulated by the demodulator 312j into a position vector notification signal PVx and a digital audio signal Ax, and converts the position vector notification signal PVx to a direction setting unit 81j. The digital audio signal Ax is supplied to the audio output unit 32j.
[0166]
The direction setting unit 81j determines the positions of the user U and the speaker 80j from the position vector notification signal PVx supplied from the multiplexed signal demultiplexing unit 711j so that the audio output unit 32j of the speaker 80j faces the user U. The speaker 80j is rotated by a rotation mechanism (not shown). For example, as illustrated in FIG. 22, when the direction setting unit 811 determines that the audio output unit 321 of the speaker 801 is facing left by 30 ° with respect to the user U, the direction setting unit 811 rotates the speaker 801 rightward by 30 ° by the rotation mechanism. Let it.
[0167]
The system control device 50 generates the position vector notification signal PVx including the position parameters (Ru, θu) of the user U stored in the detection table of the position detection unit 42 and the position parameters (Rl, θl) of each speaker 80j. Then, the generated position vector notification signal PVx is supplied to the corresponding transmitting device 61x.
[0168]
Next, the reproduction operation of the audio system 3 having the above configuration will be described with reference to the flowchart shown in FIG. This playback operation is an operation of playing a DVD with each speaker 80j facing the user U. The description of the same operation as the reproduction operation of the audio system 1 and the audio system 2 according to the first and second embodiments (the operation shown in the flowcharts of FIGS. 9 and 19) is omitted. .
[0169]
The system control device 50 generates the position vector notification signal PVx from the position parameters (Ru, θu) of the user U stored in the detection table of the position detection unit 42 and the position parameters (Rl, θl) of each speaker 80j. (Step S2401).
[0170]
The system control device 50 searches for the longest detection period ΔTMAX from the detection periods ΔT11 and ΔT21 stored in the detection table (step S2402).
[0171]
The system control device 50 obtains δT11 (= (ΔTMAX−ΔT11) / 2) from the retrieved longest detection period ΔTMAX and each detection period ΔT11, and δT21 (= (ΔTMAX−ΔT21) from the longest detection period ΔTMAX and each detection period ΔT21. ) / 2) are calculated respectively (step S2403).
[0172]
The system control device 50 sets the predetermined timing to T = 0, and when T = δT11 (YES in step S2404), sends the audio output instruction signal AOx1 to the audio data buffer 211x1 of the transmission device 61x of the corresponding channel xch, The position vector notification signal PVx1 is supplied to the adder 611x1. When T = δT2l (YES in step S2404), the system control device 50 sends the audio output instruction signal AOx2 to the audio data buffer 211x2 of the transmission device 61x2 of the corresponding channel xch, and sends the position vector notification signal PVx2 to the adder 611x2. Supply.
[0173]
When the audio output instruction signal AOxi is supplied, the transmitting device 61x outputs the digital audio signal Ax stored in the audio data buffer 211xi (step S2405).
[0174]
In the adder 611x, the transmitting device 61x adds the position vector notification signal PVxi supplied from the system control device 50 and the digital audio signal Ax output from the audio data buffer 211xi to generate a multiplexed signal Mx (step S61). S2406).
[0175]
In the transmission device 61x, the pulse generation unit 212xi generates a multiplexed pulse signal MPx by performing position modulation on the pulse having the amplitude m in accordance with 0/1 of the multiplexed signal Mx (step S2407).
[0176]
The transmitting device 61x converts the multiplexed pulse signal MPx generated by the pulse generation unit 212x1 and the multiplexed pulse signal MPx generated by the pulse generation unit 212x2 into | δT21−δT11 | (= | ΔT11−ΔT21 / 2). The light is emitted into the air at different timings (step S2408).
[0177]
As described above, the two multiplexed pulse signals MPx radiated into the air at timings different by | ΔT11−ΔT21 / 2 | are separated from the transmission device 61x by the distance Rl at T = TMAX / 2, and are angled from the transmission device 61x. At the position where θl is formed, that is, at the position of the speaker 80j at which the corresponding channel chx is set, the phases match and reinforce each other.
[0178]
Therefore, at T = TMAX / 2, the composite multiplexed pulse signal 2MPx having an amplitude of 2 m is input to the receiving device 71j of the speaker 80j (step S2409).
[0179]
In the receiving device 71j of the speaker 80j, the demodulation unit 312j compares the magnitude of each pulse of the received pulse signal with a predetermined threshold value t (m <t ≦ 2m), and extracts the composite pulse signal 2Px from the received pulse signal. I do. The receiving device 71j demodulates the extracted combined multiplexed pulse signal 2MPx into the original multiplexed signal Mx (step S2410).
[0180]
The receiving device 71j separates the demodulated multiplexed signal Mx into a position vector notification signal PVx and a digital audio signal Ax in a multiplexed signal separation unit 711j, and outputs the position vector notification signal PVx to a direction setting unit 81j. The signal Ax is supplied to the audio output unit 32j (Step S2411).
[0181]
The direction setting unit 81j determines the positions of the user U and the speaker 80j from the position vector notification signal PVx supplied from the receiving device 71j, and controls the speaker 80j so that the audio output unit 32 of the speaker 80j faces the user U. It is rotated by the rotation mechanism (step S2412).
[0182]
The audio output unit 32j of the speaker 80j rotated in the direction of the user U converts the digital audio signal Ax output from the receiving device 71j into an analog audio signal, amplifies and outputs the converted analog signal, and outputs audio data. Is reproduced (step S2413).
[0183]
When T = TMAX / 2, the system control device 50 supplies the DVD player 10 with the video output instruction signal VO. Upon receiving the video output instruction signal VO, the DVD player 10 outputs a digital video signal V stored in the video data buffer 14, converts the output digital video signal V into an analog audio signal, and converts the converted analog audio signal. And reproduce the video data.
[0184]
By the above-mentioned reproduction operation, the sound system 3 can detect the positions of the speakers 80j arranged at random, and can set a channel (xch) assigned to each speaker 80j based on the detected positions. Further, the sound system 3 can transmit the audio signal Ax of the corresponding channel (xch) to the speaker 80j in which the assigned channel (xch) is set by a wireless communication method. Further, the audio system 3 can reproduce the video data and the audio data of each channel at the same timing (T = TMAX / 2).
[0185]
Further, the sound system 3 can direct each speaker 80j in the direction of the user U based on the position parameter (Ru, θu) of the user U and the position parameter (R1, θl) of each speaker 80j. In this way, by directing each speaker 80j in the direction of the user U, the sound system 3 can obtain a high sound quality surround effect.
[0186]
(Fourth embodiment)
An acoustic system 4 according to a fourth embodiment of the present invention will be described with reference to the drawings. The description of the same configuration as the acoustic system 1, the acoustic system 2, and the acoustic system 3 according to the first, second, and third embodiments is omitted.
[0187]
As shown in FIG. 25, the audio system 4 includes a DVD player 10, a transmission unit 20 disposed at an arbitrary position, speakers 901 to 905, and a radar device 40 disposed at an arbitrary position together with the transmission unit 20. , And a system controller 50.
[0188]
As shown in FIG. 26, the speaker 90j is composed of two communication devices 91j1 and 91j2 arranged at substantially the same position, a demodulation unit 312j, an audio output unit 32j, and a speaker control device 92j. . The communication device 91jn (n = 1, 2) includes a synchronization signal source 911jn, a pulse generator 912jn, and an antenna 913jn.
[0189]
When the center channel (Cch) notification instruction signal is supplied from the speaker control device 92j, the synchronization signal source 911jn generates and outputs a synchronization signal Sn having the same pattern as the synchronization signal Sk generated in the radar device 40. . The pulse generator 912n generates an electric pulse signal Pn by amplitude-modulating the pulse in accordance with 0/1 of the synchronization signal Sn output from the synchronization signal source 911jn.
[0190]
The antenna 913jn converts the electric pulse signal Pn generated by the pulse generator 912jn into an electromagnetic pulse signal, and radiates the converted electric pulse signal Pn into the air. Further, the antenna 913jn receives the electromagnetic pulse signal transmitted from the transmission unit 20, and converts the received electromagnetic pulse signal into an electric pulse signal Pn.
[0191]
The speaker control device 92j includes a CPU, a RAM, a ROM, and the like, and supplies a center channel (Cch) notification instruction signal to the communication device 91jn when an instruction unit (not shown) sets the center channel (Cch).
[0192]
The detector 41k of the radar device 40 receives a pulse signal radiated from the speaker 90j set to the center channel (Cch), and converts the received pulse signal into a digital signal.
[0193]
The detector 41k detects a synchronization signal Sn having the same pattern as the synchronization signal Sk from the converted digital signal in the synchronization signal detection unit 415k. Upon detecting the synchronization signal Sn, the detector 41k supplies a synchronization detection signal to the position detection unit 42.
[0194]
The position detector 42 measures the timing at which the synchronization detection signal is supplied from the detector 411, and stores the measured timing Tc1 in the detection table. Similarly, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing Tc2 in the memory 421.
[0195]
The position detection unit 42 calculates a deviation ΔTc (= | Tc2−Tc1 |) of the timing at which the detector 411 and the detector 412 detect the synchronization signal Sn from the timing Tc1 and the timing Tc2 stored in the memory 421, and calculates the memory 421 To be stored.
[0196]
In addition, the position detection unit 42 calculates a difference ΔT1 (= | T21−T11 |) between the detection period ΔT11 and the detection period ΔT21 stored in the detection table, and stores the difference in the detection table illustrated in FIG.
[0197]
The system controller 50 detects a difference ΔT1 in the detection period equal to the deviation ΔTc of the detection timing from the detection table of the position detection unit 42. The system controller 50 specifies the speaker 90j at the angle θl corresponding to the difference ΔT1 in the detection period equal to the detection timing deviation ΔTc as the Cch speaker.
[0198]
Further, the system controller 50 sets the Slch speaker, the Lch speaker, the Rch speaker, and the Srch speaker in order from the speaker 90j whose corresponding cosine cosθl is larger than the speaker 90j specified as the Cch speaker. Further, the system control device 50 sets the Srch speaker, the Rch speaker, the Lch speaker, and the Slch speaker in order from the speaker 90j whose corresponding cosine cosθl is smaller than the speaker 90j specified as the Cch speaker.
[0199]
Next, the reproduction operation of the audio system 4 having the above configuration will be described with reference to the flowcharts shown in FIGS. In this reproduction operation, the speaker 90j set as the center channel (Cch) is specified, a channel in charge of another speaker 90j is set, an audio signal of the set channel is transmitted to the speaker 90j, and the DVD is reproduced. It is. The same operation (operation shown in the flowcharts of FIGS. 9 and 11) as the reproduction operation of the audio system 1, the audio system 2, and the audio system 3 according to the first, second, and third embodiments is described. , The description of which will be omitted.
[0200]
First, the operation of detecting the position of each speaker 90j will be described with reference to the flowchart shown in FIG.
[0201]
When the user instructs the reproduction of the DVD, the system control device 50 supplies a position detection signal to the radar device 40.
[0202]
When the position detection signal is supplied, the two detectors 41k (k = 1, 2) constituting the radar device 40 amplitude-modulate the pulse according to 0/1 of the synchronization signal Sk to generate the pulse signal Pk. (Step S2801).
[0203]
The radar device 40 emits the pulse signal P1 generated by the detector 411 and the pulse signal P2 generated by the detector 412 into the air at the same timing T0 (step S2802).
[0204]
The position detector 42 stores the timing T0 at which the detector 41k emits the pulse signal Pk into the air in the detection table (step S2803).
[0205]
The detector 41k receives the pulse signal Pk reflected by the speaker 90j, and converts the received pulse signal Pk into a digital signal (Step S2804).
[0206]
The detector 41k detects the synchronization signal Sk from the converted digital signal in the synchronization signal detection unit 415k (Step S2805). Upon detecting the synchronization signal Sk (YES in step S2805), detector 41k supplies the position detection unit 42 with a synchronization detection signal.
[0207]
The position detector 42 measures the timing at which the synchronization detection signal is supplied from the detector 411, and stores the measured timing T11 (l = 1, 2, 3, 4, 5) in the detection table. Similarly, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing T21 in the detection table (step S2806).
[0208]
The position detection unit 42 detects the detection period ΔT11 (= T11−T0) of the detector 411 from the timing T0 and the timing T11 stored in the detection table, and detects the detection period of the detector 412 from the timing T0 and the timing T21 stored in the memory 421. The period ΔT21 (= T21−T0) is calculated and stored in the detection table (step S2807).
[0209]
The position detection unit 42 detects the distance R11 (= V · ΔT11 / 2) between the detector 411 and each speaker 90j from the calculated detection period ΔT11 and the transmission speed V of the electromagnetic pulse signal stored in the ROM or the like. From the period ΔT21 and the transmission speed V of the electromagnetic pulse signal, the distance R21 (= V · ΔT21 / 2) between the detector 412 and each speaker 90j is calculated (step S2808).
[0210]
The position detection unit 42 calculates the cosine cos θl of the angle θl (0 ≦ θl ≦ π) formed by the radar device 40 and each speaker 90j from the calculated distances R11 and R21 and stores the cosine cos θl in the detection table (step S2809). ).
[0211]
Next, the operation of specifying the speaker 90j set as the center channel (Cch) and setting the assigned channel of another speaker 90j will be described with reference to the flowchart shown in FIG.
[0212]
When the instruction unit instructs the setting of the center channel (Cch) from the instruction unit, the speaker control device 92j supplies a center channel (Cch) notification instruction signal to the communication device 91jn.
[0213]
When the center channel (Cch) notification instruction signal is supplied from the speaker control device 92j, the communication device 91jn uses the synchronization signal source 911jn to generate a synchronization signal Sn having the same pattern as the synchronization signal Sk generated by the radar device 40. Generate and output (step S2901).
[0214]
In the communication device 91jn, the pulse generation unit 912n generates an electric pulse signal Pn by amplitude-modulating the pulse according to 0/1 of the synchronization signal Sn (step S2902).
[0215]
The communication device 91jn uses the antenna 913jn to convert the electric pulse signal generated by the pulse generation unit 912jn into an electromagnetic pulse signal, and emits the converted electromagnetic pulse signal into the air (step S2903).
[0216]
The detector 41k of the radar device 40 receives the pulse signal radiated from the speaker 90j set to the center channel (Cch), and converts the received pulse signal into a digital signal (Step S2904).
[0219]
The detector 41k detects a synchronization signal Sn having the same pattern as the synchronization signal Sk from the converted digital signal in the synchronization signal detection unit 415k (step S2905). When detecting the synchronization signal Sn (YES in step S2905), the detector 41k supplies the position detection unit 42 with the synchronization detection signal.
[0218]
The position detector 42 measures the timing at which the synchronization detection signal is supplied from the detector 411, and stores the measured timing Tc1 in the detection table. Similarly, the position detection unit 42 measures the timing at which the synchronization detection signal is supplied from the detector 412, and stores the measured timing Tc2 in the detection table (step S2906).
[0219]
The position detection unit 42 calculates a deviation ΔTc (= | Tc2−Tc1 |) of the timing at which the detector 411 and the detector 412 detect the synchronization signal Sn from the timing Tc1 and the timing Tc2 stored in the memory 421, and calculates the memory 421 (Step S2907).
[0220]
In addition, the position detection unit 42 calculates the difference ΔT1 (= | T21−T11 |) between the detection period ΔT11 and the detection period ΔT21 stored in the detection table, and stores the difference in the detection table (step S2908).
[0221]
The system control device 50 detects a difference ΔT1 in the detection period equal to the deviation ΔTc of the detection timing from the detection table of the position detection unit 42 (step S2909).
[0222]
The system control device 50 specifies the speaker 90j at the angle θl corresponding to the difference ΔT1 in the detection period equal to the detection timing deviation ΔTc as the Cch speaker (step S2910).
[0223]
Further, the system controller 50 sets the Slch speaker, the Lch speaker, the Rch speaker, and the Srch speaker in order from the speaker 90j whose corresponding cosine cosθl is larger than the speaker 90j specified as the Cch speaker. Further, the system control device 50 sets the Srch speaker, the Rch speaker, the Lch speaker, and the Slch speaker in order from the speaker 90j whose corresponding cosine cosθl is smaller than the speaker 90j specified as the Cch speaker (step S2911).
[0224]
Through the above-described reproduction operation, the sound system 4 can specify the speaker 90j set as the center channel (Cch) and set a channel in charge of another speaker 90j.
[0225]
The present invention is not limited to the above embodiment, and various modifications and applications are possible. Hereinafter, modifications of the above embodiment applicable to the present invention will be described.
[0226]
In the above embodiment, the radar device 40 detects the positions of the speakers 30j, 70j, 80j, and 90j by the UWB communication method, and the transmitting devices 21 and 61 transmit sound to the speakers 30j, 70j, 80j, and 90j. Data was being sent. However, the present invention is not limited to this, and the position detecting means of the acoustic system 1 is arbitrary as long as it detects the position using electromagnetic waves, and the transmitting means may transmit information using a pulse signal. May be used.
[0227]
In the above embodiment, the radar device 40 uses a pulse amplitude modulation method as a modulation method, and the transmission devices 21 and 61 use a pulse position modulation method as a modulation method. However, the present invention is not limited to this, and the radar device 40 may use a pulse position modulation method or a pulse phase modulation (Pulse Phase Modulation) method that changes the phase of a pulse according to information as a modulation method. The transmission devices 21 and 61 may use a pulse amplitude modulation method or a pulse phase modulation method as a modulation method. That is, the modulation method of the radar device 40 and the transmission devices 21 and 61 is arbitrary.
[0228]
Furthermore, in the above embodiment, the audio system 1 has five surround channels, but the present invention is not limited to this, and the number of surround channels of the audio system 1 is arbitrary, such as 5.1 surround channels. .
[0229]
Further, in the above embodiment, the transmission devices 21x and 61x and the radar device 40 are configured separately, but the present invention is not limited to this, and the transmission devices 21x and 61x and the radar device 40 , As shown in FIG.
[0230]
Further, in the first, second, and third embodiments, the transmission units 20, 60, the radar device 40, the DVD recorder 10, and the speakers 30j, 70j, 80j, and 90j are configured separately. Was. However, the present invention is not limited to this, and the transmitting units 20 and 60 and the radar device 40 may be incorporated in the DVD recorder 10 as shown in FIG. 31, and the speaker 30j as shown in FIG. , 70j, 80j, and 90j.
[0231]
In the second and third embodiments, the acoustic systems 2 and 3 detect the position of the user U using the radar device 40. However, the present invention is not limited to this, and the acoustic systems 2 and 3 may infer the positional relationship of the user U from the positional relationship between the speakers 70j and 80j detected by the radar device 40.
[0232]
【The invention's effect】
According to the present invention, it is possible to provide a transmission device, a wireless communication system, a transmission method, and a wireless communication method that can transmit different information to a plurality of reception devices arranged at random.
[0233]
Further, according to the present invention, it is possible to provide an audio device, an audio system, and a channel setting method capable of setting channels in charge of a plurality of speakers arranged at random.
[0234]
Further, according to the present invention, it is possible to provide an audio device, an audio system, and an audio reproduction method capable of transmitting audio information of a plurality of channels to a speaker wirelessly for reproduction.
[0235]
Further, according to the present invention, it is possible to provide an audio system and an audio reproducing method capable of obtaining a high-quality surround sound effect.
[Brief description of the drawings]
FIG. 1 is a block diagram of an acoustic system according to a first embodiment of the present invention.
FIG. 2 is a block diagram of a DVD player according to the first embodiment of the present invention.
FIG. 3 is a block diagram of a transmission device according to the first embodiment of the present invention.
FIG. 4 is a block diagram of the speaker according to the first embodiment of the present invention.
FIG. 5 is a block diagram of the radar device according to the first embodiment of the present invention.
FIG. 6 is a block diagram of a detector according to the first embodiment of the present invention.
FIG. 7 is a diagram illustrating a detection table stored in a memory of the position detection unit according to the first embodiment of the present invention.
FIG. 8 is a diagram for explaining an angle formed by the speaker and the radar device and a distance between the speaker and the radar device.
FIG. 9 is a flowchart showing an operation in which the audio system according to the first embodiment of the present invention reads data stored in a DVD, and separates and stores the read data into video data and audio data in channel units. FIG.
FIG. 10 is a flowchart illustrating an operation of setting the assigned channel of each speaker by the audio system according to the first embodiment of the present invention.
FIG. 11 is a flowchart showing an operation in which the audio system according to the first embodiment of the present invention reproduces audio information of five surround channels from each speaker.
FIG. 12A is an image diagram of a digital audio signal generated in a DVD player;
B is a waveform diagram of a pulse signal transmitted from the transmitting device to the speaker,
C is a waveform diagram of a composite pulse signal input to the receiving device.
FIG. 13 is a diagram for explaining a wavefront at T = δT2l of a pulse signal radiated from the transmission device according to the first embodiment of the present invention.
FIG. 14 is a diagram for explaining a wavefront at T = TMAX / 2 of a pulse signal radiated from the transmission device according to the first embodiment of the present invention.
FIG. 15A is a waveform diagram of a pulse signal input to the receiving device, and FIG. 15B is an image diagram of a digital audio signal demodulated in the receiving device.
FIG. 16 is a block diagram of an acoustic system according to a second embodiment of the present invention.
FIG. 17 is a block diagram of a transmission device according to a second embodiment of the present invention.
FIG. 18 is a block diagram of a speaker according to a second embodiment of the present invention.
FIG. 19 is a flowchart showing an operation in which the acoustic system according to the second embodiment of the present invention detects a position of a user and sets a channel in charge of each speaker.
FIG. 20 is a flowchart showing an operation of setting the output level of each speaker by the acoustic system according to the second embodiment of the present invention.
FIG. 21 is a flowchart showing an operation in which the audio system according to the second embodiment of the present invention reproduces audio data of five surround channels from respective speakers at a set output level.
FIG. 22 is a block diagram of an acoustic system according to a third embodiment of the present invention.
FIG. 23 is a block diagram of a speaker according to a third embodiment of the present invention.
FIG. 24 shows an operation in which the acoustic system according to the third embodiment of the present invention rotates each speaker so as to face the user, and reproduces 5-surround channel audio data from the rotated speaker. It is a flowchart figure.
FIG. 25 is a block diagram of an acoustic system according to a fourth embodiment of the present invention.
FIG. 26 is a block diagram of a speaker according to a fourth embodiment of the present invention.
FIG. 27 is a diagram illustrating a detection table stored in a memory of a position detection unit according to the fourth embodiment of the present invention.
FIG. 28 is a flowchart illustrating an operation of detecting the positions of a user and a speaker by the acoustic system according to the fourth embodiment of the present invention.
FIG. 29 is a flowchart illustrating an operation in which the acoustic system according to the fourth embodiment of the present invention specifies a speaker set as the center channel and sets a channel assigned to another speaker.
FIG. 30 is a block diagram of an apparatus in which a transmitting apparatus and a radar apparatus according to an embodiment of the present invention are integrally configured.
FIG. 31 is a block diagram of a DVD player including a transmitter, a radar device, and a system control device according to an embodiment of the present invention.
FIG. 32 is a block diagram of a speaker including a transmitter, a radar device, and a system control device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sound system, 10 ... DVD player, 20 ... Transmission part, 21 ... Transmission apparatus, 211 ... Audio data buffer, 212 ... Pulse generation part, 213 ... Transmission antenna, 30 ... Speaker, 312 ... Demodulation part, 40 ... Radar apparatus 41, a detector, 411, a synchronous signal source, 412, a pulse generator, 413, an antenna, 415, a synchronous signal detector, 42, a position detector, 50, a system controller, 2, an acoustic system, 60, a transmitter 61, a transmitting device, 611, an adder, 70, a speaker, 711, a multiplexed signal separating unit, 72, an output level setting unit, 3, an audio system, 80, a speaker, 81, a direction setting unit, 4, an audio system, Reference numeral 90: speaker, 91: communication device, 911: synchronization signal source, 912: pulse generator, 92: speaker control device

Claims (23)

A transmission device comprising: a first antenna and a second antenna arranged at a predetermined interval, and transmitting a pulse signal modulated in accordance with information to a reception device,
First detection means for radiating an electromagnetic wave from the first antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna;
Second detection means for radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating means;
First radiating means for radiating the pulse signal from the first antenna;
A second radiating unit that radiates the pulse signal from the second antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting unit;
A transmission device comprising: The first and second detection means emits an electromagnetic wave by an UWB (Ultra Wide Band) communication method, and detects a reflected wave of the electromagnetic wave at the receiving device,
The first and second radiating means radiate a pulse signal by a UWB communication method.
The transmitting device according to claim 1, wherein: A transmitting device that includes first and second antennas that are arranged at a predetermined interval and that transmits a pulse signal modulated in accordance with information according to information; and a receiving device that receives the transmitted pulse signal and receives the received pulse. A receiving device that demodulates a signal into the information and outputs the information,
The transmitting device emits an electromagnetic wave from the first antenna, and a first detection unit that detects a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna,
Second detection means for radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating means;
First radiating means for radiating the pulse signal from the first antenna;
A second radiating unit that radiates the pulse signal from the second antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting unit;
The receiving device determines a threshold value of the input signal to determine, from the input signal, a pulse signal radiated from the first radiating unit and a pulse signal radiated from the second radiating unit. And extracting demodulated information from the extracted composite pulse signal while extracting the composite pulse signal, and demodulating means for outputting the demodulated information.
A wireless communication system, comprising: The threshold is set to be larger than the amplitude of each pulse of the pulse signal radiated from the first and second radiating means and smaller than the amplitude of the composite pulse signal.
The wireless communication system according to claim 3, wherein: The first and second detection means emits an electromagnetic wave by a UWB communication system, and detects a reflected wave of the electromagnetic wave at the receiving device,
The transmitting device and the receiving device perform wireless communication by a UWB communication method.
The wireless communication system according to claim 3 or 4, wherein: An audio device comprising first and second antennas arranged at predetermined intervals, converting audio information of a plurality of channels into a pulse signal, and transmitting the pulse signal to a speaker,
First detection means for radiating an electromagnetic wave from the first antenna and detecting a reflected wave of each electromagnetic wave at each speaker from the electromagnetic wave input to the first antenna;
Second detection means for radiating electromagnetic waves from the second antenna and detecting reflected waves of the electromagnetic waves at the speakers from the electromagnetic waves input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
Angle calculation means for calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation means,
Assigned channel setting means for setting a channel assigned to each speaker based on the calculated angle,
An acoustic device comprising: Difference period calculation means for calculating a first and second difference period by subtracting a period until the electromagnetic waves radiated from the first and second antennas reach each speaker from a predetermined value,
Storage means for storing the first and second difference periods for each speaker in association with the assigned channel of each speaker set by the channel setting means;
A first radiating unit that converts audio information of a corresponding assigned channel into a pulse signal at a timing after the first difference period from a predetermined timing, and radiates the converted pulse signal from the first antenna;
A second radiating unit that radiates the same pulse signal as the pulse signal radiated by the first radiating unit from the second antenna at a timing after the second differential period from a predetermined timing;
The acoustic device according to claim 6, further comprising: The first and second detection means emits an electromagnetic wave by UWB communication system, and detects a reflected wave of the electromagnetic wave at the speaker,
The first and second radiating means radiate a pulse signal by a UWB communication method.
The acoustic device according to claim 6 or 7, wherein: An audio device that includes first and second antennas that are arranged at predetermined intervals and converts audio information of a plurality of channels into a pulse signal and transmits the pulse signal to a speaker; And a plurality of speakers for demodulating and reproducing the audio information from the pulse signal obtained,
The acoustic device radiates an electromagnetic wave from the first antenna, and detects a reflected wave of each of the electromagnetic waves at each speaker from the electromagnetic wave input to the first antenna;
Second detection means for radiating electromagnetic waves from the second antenna and detecting reflected waves of the electromagnetic waves at the speakers from the electromagnetic waves input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected by the first and second detecting means are measured, and the first and second timings are measured based on the measured timings. Arrival period calculating means for calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
Angle calculation means for calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation means,
Assigned channel setting means for setting a channel assigned to each speaker based on the calculated angle.
An acoustic system, characterized in that: A difference period calculation unit configured to calculate a first and a second difference period by subtracting a period until an electromagnetic wave radiated from the first and second antennas reaches each speaker from a predetermined value; ,
Storage means for storing the first and second difference periods for each speaker in association with the assigned channel of each speaker set by the channel setting means;
A first radiating unit that converts audio information of a corresponding assigned channel into a pulse signal at a timing after the first difference period from a predetermined timing, and radiates the converted pulse signal from the first antenna;
A second radiating means for radiating the same pulse signal as the pulse signal radiated by the first radiating means from the second antenna at a timing after the second differential period from a predetermined timing. ,
The speaker determines a threshold value of the input signal to synthesize a pulse signal radiated from the first radiating unit and a pulse signal radiated from the second radiating unit from the input signal. Demodulating means for extracting a pulse signal and demodulating the audio information from the extracted synthesized pulse signal;
Audio information output means for outputting audio information demodulated by the demodulation means,
The acoustic system according to claim 9, wherein: The threshold is set to be larger than the amplitude of each pulse of the pulse signal radiated from the first and second radiating means and smaller than the amplitude of the composite pulse signal.
The acoustic system according to claim 10, wherein: The audio device calculates a distance between the audio device and each speaker from the period calculated by the arrival period calculation unit, and detects a position of each speaker from the calculated distance and the angle calculated by the angle calculation unit. Position detecting means for
User position estimating means for estimating the position of the user based on the position of each speaker detected by the position detecting means,
The acoustic system according to claim 9 or 10, wherein: The distance R between the acoustic device and each speaker and the angle θ formed by the acoustic device and each speaker are 2D for the predetermined interval, V for the speed of the electromagnetic wave, and the electromagnetic wave radiated from the first antenna. Is defined by the following equation, where T1 is a period until the electromagnetic wave radiated from the second antenna reaches each speaker, and T2 is a period until the electromagnetic wave radiated from the second antenna reaches each speaker.
13. The sound system according to claim 12, wherein:

The first detecting means emits an electromagnetic wave from the first antenna, and detects a reflected wave of the electromagnetic wave at a user and each speaker from the electromagnetic wave input to the first antenna,
The second detection means emits an electromagnetic wave from the second antenna, and detects a reflected wave of the electromagnetic wave at a user and each speaker from the electromagnetic wave input to the second antenna,
The arrival period calculating unit measures a timing at which an electromagnetic wave is radiated from the first and second antennas and a timing at which a reflected wave is detected by the first and second detecting units, and calculates the timing based on the measured timing. Calculating a period until the electromagnetic waves radiated from the first and second antennas reach the user and each speaker,
The angle calculation unit calculates an angle formed by the audio device with the user and each speaker from the period calculated by the arrival period calculation unit,
The position detecting means calculates the distance between the audio device and the user and each speaker from the period calculated by the arrival time calculating means, and calculates the distance between the user and each of the users based on the calculated distance and the angle calculated by the angle calculating means. Detect the position with the speaker,
The user position estimating means, based on the positional relationship between the user and each speaker detected by the position detecting means, to estimate the position of the user,
14. The acoustic system according to claim 12, wherein: The user position estimating unit is configured to calculate an average value of a distance between the acoustic device, the user, and each speaker calculated by the position detecting unit, and an angle formed by the acoustic device, the user, and each speaker calculated by the angle calculating unit. Is calculated, and the position of the user is estimated from the distance and the angle approximating the calculated average value.
The acoustic system according to claim 14, wherein: The acoustic device further includes a position notification signal generation unit that generates a position notification signal that notifies each speaker of the estimated position of the user and the detected position of each speaker,
The first and second radiating means converts a multiplexed signal obtained by multiplexing the generated position notification signal and the audio information into a pulse signal, and radiates the converted pulse signal;
The demodulation unit includes a first separation unit that receives the radiated pulse signal, and separates a multiplexed signal obtained by demodulation into a position indication signal and audio information,
The speaker further includes a rotating unit that sets an output direction of the speaker based on the separated position notification signal and rotates in the set output direction.
The acoustic system according to any one of claims 12 to 15, wherein: The sound device, a distance calculation unit that calculates the distance between the user and each speaker from the estimated position of the user and the detected position of each speaker,
Output level setting means for setting an output level of each speaker based on the distance between the user and each speaker calculated by the distance calculation means, and generating an output level instruction signal for instructing each speaker of the set output level; And further comprising
The first and second radiating means convert a multiplexed signal obtained by multiplexing the generated output level indication signal and the audio information into a pulse signal, and radiate the converted pulse signal. ,
The demodulation unit includes a second separation unit that receives the emitted pulse signal, and separates a multiplexed signal obtained by demodulation into an output level instruction signal and audio information.
The speaker includes an output level setting unit that sets an output level of audio information based on the separated output level instruction signal,
The audio information output means outputs the separated audio information under the set output level,
The acoustic system according to any one of claims 12 to 16, wherein: The distance L between the user and each speaker is Ru, the distance between the audio device and the user U is Ru, the angle formed by the audio device and the user U is θu, the distance between the audio device and each speaker is R, Assuming that the angle formed by the speaker is θ, it is defined by the following equation:
The acoustic system according to claim 17, wherein:

The first and second detection means emits an electromagnetic wave by a UWB communication system, and detects a reflected wave of the electromagnetic wave at the user and / or the speaker,
The audio device transmits a pulse signal to each speaker by a UWB communication method,
The acoustic system according to any one of claims 9 to 18, wherein: A transmission method in a transmission apparatus, comprising: a first antenna and a second antenna arranged at a predetermined interval, and transmitting a pulse signal modulated in accordance with information to a reception apparatus,
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculating step of calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating step;
A first radiation step of radiating the pulse signal from the first antenna;
A second radiating step of radiating the pulse signal from the second transmitting antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting step;
A transmission method, comprising: A transmitting device that includes first and second antennas that are arranged at a predetermined interval and that transmits a pulse signal modulated in accordance with information according to information; and a receiving device that receives the transmitted pulse signal and receives the received pulse. A receiving apparatus for demodulating a signal into the information and outputting the information, and a wireless communication method in a wireless communication system including:
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of the electromagnetic wave at the receiving device from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculating step of calculating a period until the electromagnetic wave radiated from the antenna reaches the receiving device,
A difference period for calculating a difference period between a period until the electromagnetic wave radiated from the first antenna reaches the receiving device and a period until the electromagnetic wave radiated from the second antenna reaches the receiving device. Calculating step;
A first radiation step of radiating the pulse signal from the first antenna;
A second radiating step of radiating the pulse signal from the second transmitting antenna at a timing after the difference period from a timing at which the pulse signal is radiated by the first transmitting step;
By extracting a threshold value of the input signal, a composite pulse signal of a pulse signal radiated from the first radiation step and a pulse signal radiated from the second radiation step is extracted from the input signal. Demodulating the information from the extracted synthesized pulse signal, and outputting the demodulated information;
A wireless communication method, comprising: A channel setting method in an audio device including first and second antennas arranged at predetermined intervals and converting audio information of a plurality of channels into a pulse signal and transmitting the pulse signal to a speaker,
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of each of the electromagnetic waves at each speaker from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of each electromagnetic wave at each speaker from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculation step of calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
An angle calculation step of calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation step,
An assigned channel setting step of setting a channel assigned to each speaker based on the calculated angle,
A channel setting method, comprising: An audio device that includes first and second antennas that are arranged at predetermined intervals and converts audio information of a plurality of channels into a pulse signal and transmits the pulse signal to a speaker; And a plurality of speakers for demodulating and reproducing the audio information from the pulse signal, and a method for reproducing audio in an audio system including:
A first detection step of radiating an electromagnetic wave from the first antenna and detecting a reflected wave of each of the electromagnetic waves at each speaker from the electromagnetic wave input to the first antenna;
A second detection step of radiating an electromagnetic wave from the second antenna and detecting a reflected wave of each electromagnetic wave at each speaker from the electromagnetic wave input to the second antenna;
The timing at which electromagnetic waves are radiated from the first and second antennas and the timing at which reflected waves are detected in the first and second detection steps are measured, and the first and second timings are measured based on the measured timings. An arrival period calculation step of calculating a period until the electromagnetic wave radiated from the antenna reaches each speaker,
An angle calculation step of calculating an angle formed by the audio device with each speaker from the period calculated by the arrival period calculation step,
An assigned channel setting step of setting a channel assigned to each speaker based on the calculated angle,
A difference period calculation step of calculating a first and second difference period by subtracting a period until an electromagnetic wave radiated from the first and second antennas reaches each speaker from a predetermined value;
A storing step of storing the first and second difference periods in each speaker in association with a channel assigned to each speaker set in the channel setting step;
A first radiating step of converting audio information of a corresponding assigned channel into a pulse signal at a timing after the first difference period from a predetermined timing, and radiating the converted pulse signal from the first antenna;
A second radiating step of radiating the same pulse signal as the pulse signal radiated by the first radiating step from the second antenna at a timing after the second differential period from a predetermined timing;
By extracting a threshold value of the input signal, a composite pulse signal of a pulse signal radiated from the first radiation step and a pulse signal radiated from the second radiation step is extracted from the input signal. And demodulating the audio information from the extracted synthesized pulse signal;
Audio information output step of outputting audio information demodulated by the demodulation step,
A sound reproducing method, comprising:

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