JP3749624B2 - Wireless transmitter and wireless system using this wireless transmitter - Google Patents

Description

【００４５】
この表１に示す各周波数は、一般に知られている社団法人電波産業会（Association of Radio Industries and Businesses：ＡＲＩＢ）の「ＲＣＲ−ＳＴＤ−１５Ａ」規格によって定められたものである。そして、各グループＧＲ１乃至ＧＲ６は、それぞれに振り分けられている各周波数を、同じ場所で同時に使用しても、上述した混信や相互変調等の電波障害を生ずる恐れのないもの毎に、グループ化したものである。
【００４６】
例えば、グループＧＲ１には、８０６．１２５ＭＨｚ、８０６．３７５ＭＨｚ、８０７．１２５ＭＨｚ、８０７．７５０ＭＨｚ、８０９．０００ＭＨｚ及び８０９．５００ＭＨｚという６つの周波数を振り分けているが、これら各周波数は、それぞれを同じ場所で同時に使用しても、上記混信や相互変調の影響を受けることはない。このことは、他のグループＧＲ２乃至ＧＲ６に振り分けた各周波数についても、同様である。なお、各周波数には、それぞれのグループＧＲ１乃至ＧＲ６内でのチャンネル番号と、上記「ＲＣＲ−ＳＴＤ−１５Ａ」規格により定められているチャンネル呼称とが、付されている。
【００４７】
そして、上記表１における各グループＧＲ１乃至ＧＲ６のうちのいずれか１つを選択するためのグループ選択部９と、各グループＧＲ１乃至ＧＲ６内の各チャンネルを選択するためのチャンネル選択部１０とを設け、これらをＣＰＵ８に接続している。即ち、ＣＰＵ８は、上記グループ選択部９によって選択して得たグループ内に振り分けられている各チャンネルのうち、上記チャンネル選択部１０によって選択して得たチャンネルに対応するチャンネルデータを、上記メモリ内から呼び出す。そして、この呼び出したチャンネルデータに基づいて、これ対応する周波数の信号を発振するように、ＰＬＬシンセサイザ回路５を制御する。これによって、上記グループ選択部９とチャンネル選択部１０とによって選択して得たチャンネルが、この送信機の通信チャンネルとして設定される。
【００４８】
なお、ＣＰＵ８は、送信機自体の電源スイッチ１１をＯＮ状態からＯＦＦ状態に切り替える際に、その時点で上記ＰＬＬシンセサイザ回路５の制御に使用しているチャンネルデータ、即ちその時点で通信に使用しているチャンネルに対応するチャンネルデータを、上記メモリ内に一時的に記憶するようにも構成（プログラム）されている。ただし、送信機が初期状態にあるとき、例えば工場出荷状態にあるときは、上記メモリ内には、所定のチャンネル、例えばグループＧＲ６のチャンネルＣＨ１（即ちＢ６１チャンネル）に対応するチャンネルデータが記憶されている状態にある。
【００４９】
また、ＣＰＵ８には、受信機側のボリュームを調節するためのボリューム調節部１２と、この送信機に、他のシステムの送信機と区別するための任意の２桁の識別番号（以下、識別コードと言う。）を設定するためのコード設定部１３とが、接続されている。なお、ボリューム調整部１２は、ボリュームアップボタン１２ａとボリュームダウンボタン１２ｂとから成る。そして、ＣＰＵ８は、これらボリューム調整部１２とコード設定部１３、及び上記グループ選択部９とチャンネル選択部１０との各操作に応じて、後述する制御データを生成し、これを変調器４を介して受信機側に送信する。
【００５０】
更に、変調器４の入力側には、予め定めた周波数の信号、例えば３２ｋＨｚの交流信号（以下、トーン信号と言う。）を発生するためのトーン信号発生器１４を設けている。そして、このトーン信号発生器１４の出力のＯＮ／ＯＦＦについても、ＣＰＵ８によって制御するよう構成している。また、上述した音声スイッチ回路３についても、そのＯＮ／ＯＦＦ動作を、ＣＰＵ８によって制御する。
【００５１】
ここで、送信機の外観を図２（ａ）に示す。同図（ａ）に示すように、送信機は、一般によく知られている手持型のもので、外観上、丸棒状のグリップ部１００と、このグリップ部１００の一端に結合された球状の収音部１０１と、から成る。このうち、収音部１０１に、上述したマイクロホン１が内蔵されており、このマイクロホン１以外の（図１（ａ）における）各構成要素は、グリップ部１００内に内蔵されている。そして、グリップ部１００の下方側（ヘッド部１０１とは反対側）のカバー１０２は、着脱可能とされており、このカバー１０２を取り外すことによって、同図（ｂ）に示すように、上記グループ選択部９、チャンネル選択部１０、コード設定部１３及びボリューム調節部１２（ボリュームアップボタン１２ａ及びボリュームダウンボタン１２ｂ）を、それぞれ任意に操作することができる。なお、電源スイッチ１１は、例えばスライド式のもので、そのツマミ部分のみを露出させた状態で、グリップ部１００側面のやや上方寄りに設けられている。
【００５２】
上記図２（ｂ）に示すように、グループ選択部９及びチャンネル選択部１０は、一般に知られているディジタルコード出力形式のスイッチにより構成されている。なお、同図（ｂ）は、グループ番号が「ＧＲ１」でチャンネル番号が「ＣＨ３」のチャンネル、即ち周波数が８０７．１２５ＭＨｚの「Ｂ１３チャンネル」を選択している状態を示す。
【００５３】
そして、上記グループ選択部９及びチャンネル選択部１０の下方に、コード設定部１３が設けられている。このコード設定部１３は、上述したコード番号の１桁目（１０位桁）の数字と２桁目（１位桁）の数字とをそれぞれ別々に設定するための２つのスイッチ１３ａ、１３ｂにより構成されており、これらのスイッチ１３ａ、１３ｂもまた、上記グループ選択部９及びチャンネル選択部１０と同様、ディジタルコード出力形式のスイッチにより構成されている。なお、同図（ｂ）は、各スイッチ１３ａ、１３ｂにより、上記識別コードとして、「２２」を設定している状態を示す。
【００５４】
そして、上記コード設定部１３の下方に、ボリューム設定部１２を構成する押しボタン式のボリュームアップボタン１２ａとボリュームダウンボタン１２ｂとが、設けられている。
【００５５】
ところで、上記のように構成された送信機においては、ＣＰＵ８は、図３に示すフローチャートに従って動作する。例えば、今、送信機の電源（電源スイッチ１１）が「ＯＦＦ」の状態にあるとする。
【００５６】
この状態で、送信機の電源（電源スイッチ１１）をＯＮすると、ＣＰＵ８は、まず、音声スイッチ回路３をＯＦＦする（ステップＳ２）。これによって、マイクロホン１の出力（音声信号）は、ＯＦＦ状態となる。
【００５７】
次に、ＣＰＵ８は、前回電源スイッチ１１をＯＦＦしたときに上記メモリ内に一時的に記憶したチャンネルデータ、即ち前回の通信に使用したチャンネルに対応するチャンネルデータを、上記メモリ内から呼び出す。なお、上述したように、送信機が初期状態にあるときは、「Ｂ１３チャンネル」に対応するチャンネルデータが、上記メモリ内から呼び出される。そして、この呼び出したチャンネルデータに対応するチャンネル（所謂記憶チャンネル）と、現在、上記グループ選択部９及びチャンネル選択部１０によって選択されているチャンネル（所謂選択チャンネル）とを照合し、これらが互いに同一であるか否かを判断する（ステップＳ４）。
【００５８】
このステップＳ４において、上記記憶チャンネルと選択チャンネルとが異なる、即ち前回通信に使用したチャンネルとは異なるチャンネルが新たな通信チャンネルとして選択されたと判断した場合（ＮＯの場合）は、ＣＰＵ８は、前回通信に使用したチャンネルを用いて、上述した制御データを送信する準備を始める。この制御データのフォーマットを、図４に示す。
【００５９】
同図に示すように、制御データは、ビット同期部３０１、フレーム同期部３０２、識別コードデータ部３０３、制御種別フラグ３０４及び制御データ本体部３０５という各ディジタルデータを、それぞれ直列に接続したものである。このうち、ビット同期部３０１及びフレーム同期部３０２は、この制御データを送信する際に、受信機側との同期を取るために用いるものである。そして、識別コードデータ部３０３に、上記コード設定部１３によって設定して得た識別コード（例えば図２（ｂ）の場合は、「２２」という識別コード）を表すデータを設定する（ステップＳ６）。そして、制御種別フラグ３０４に、フラグ「１」を立てると共に、制御データ本体部３０５に、上記グループ選択部９及びチャンネル選択部１０によって選択して得たチャンネルのチャンネルデータを設定する（ステップＳ８）。なお、上記制御種別フラグ３０４は、制御データ本体部３０５に設定されるデータの種別を表すもので、これにフラグ「１」が立っているときは、制御データ本体部３０５に、上記チャンネルデータが設定されていることを表す。
【００６０】
そして、上記記憶チャンネルデータに基づいて、前回通信に使用したチャンネルを、上記制御データを送信するための通信チャンネルとして設定する（ステップＳ１０）。この状態で、変調器４や電力増幅器６等に電源を供給することによって、この送信機の出力（即ちＲＦパワー）をＯＮし（ステップＳ１２）、これによって上記制御データを受信機側に向けて送信する（ステップＳ１４）。なお、このステップＳ１２よりも前は、送信機は未だ電波を発射していない状態にある。
【００６１】
受信機に向けて制御データを送信した後、ＣＰＵ８は、送信機の出力をＯＦＦすると共に（ステップＳ１６）、上記記憶チャンネルデータに変えて、現在グループ選択部９及びチャンネル選択部１０によって選択されているチャンネルのデータを、上記メモリ内に一時記憶する（ステップＳ１８）。そして、今度は、上記ステップＳ１８において新たに記憶したデータに対応するチャンネル、即ち上記グループ選択部９及びチャンネル選択部１０によって選択して得たチャンネルを用いて、上記制御データを送信する準備を始める。
【００６２】
即ち、制御データの識別コードデータ部３０３に、この送信機の識別コードを表すデータを設定する（ステップＳ２０）。そして、上記制御種別フラグ３０４に、フラグ「１」を立てると共に、制御データ本体部３０５に、上記新たに記憶したチャンネルデータを設定する（ステップＳ２２）。そして、上記新たに記憶したチャンネルデータに基づいて、グループ選択部９及びチャンネル選択部１０によって選択して得たチャンネルを、通信チャンネルとして設定し（ステップＳ２４）、送信機の出力をＯＮする（ステップＳ２６）ことによって上記制御データを受信機側に向けて送信する（ステップＳ２８）。
【００６３】
上記制御データを送信した後、上述したトーン信号発生器１４の出力をＯＮしてトーン信号をも送信させると共に（ステップＳ３０）、音声スイッチ３をＯＮすることにより（ステップＳ３２）、無線通信（即ち音声信号の送信）を可能とする（ステップＳ３４）。
【００６４】
この無線通信中にあるとき、ＣＰＵ８は、常にボリューム調節部１２の操作状態を監視している（ステップＳ３６）。ボリューム調節部１２が操作されると（ステップＳ３６においてＹＥＳの場合）、ＣＰＵ８は、上記トーン信号の出力を停止する（ステップＳ３８）。そして、今度は、上記ボリューム調節部１２の操作内容を表すボリューム調節データを生成し、これを、制御データに設定して、現在通信に使用しているチャンネルにより受信機側に送信する準備を始める。
【００６５】
即ち、制御データの識別コードデータ部３０３に、この送信機の識別コードを表すデータを設定する（ステップＳ４０）。そして、今度は、制御種別フラグ３０４に「０」を設定する（即ちフラグを降ろす）と共に、制御データ本体部３０５に、上記ボリューム調節データを設定する（ステップＳ４２）。この制御データを、現在使用しているチャンネルにより受信機側に送信する（ステップＳ４４）。この制御データの送信後、トーン信号の送信を再開して（ステップＳ４６）、上記ステップＳ３４の通信可能状態に戻る。なお、上記制御種別フラグ３０４は、これに「０」が設定されているとき、制御データ本体部３０５に上記ボリューム調節データが設定されていることを表す。
【００６６】
上記ステップＳ４において、上記記憶チャンネルと選択チャンネルとが一致する、即ち前回通信に使用したチャンネルと現在グループ選択部９及びチャンネル選択部１０によって選択されているチャンネルとが同一であると判断した場合（ＹＥＳの場合）、ＣＰＵ８は、一気にステップＳ２０に進む。即ち、前回と同じチャンネルを用いて無線通信を行う場合には、ＣＰＵ８は、ステップＳ６乃至Ｓ１８の各手順を省略するので、その分、送信機の電源をＯＮしてから無線通信が可能となるまでの所謂立ち上がり時間を短縮できる。本実施の形態においては、ＣＰＵ８が、上記ステップＳ６乃至Ｓ１８の各手順を処理するのに約１秒程度の時間を要するので、前回と同じチャンネルを用いて無線通信を行う場合には、この約１秒間という時間を短縮できる。
【００６７】
一方、上記のように構成された送信機に対して、受信機は、次のように構成されている。即ち、受信機は、例えばスーパーヘテロダイン方式のもので、図１（ｂ）に示すように、送信機から送られてくる電波を受信アンテナ２１で受信した後、その受信信号を高周波増幅器２２で増幅した信号が入力される混合器２３を有している。この混合器２３は、これに入力される上記増幅後の受信信号を、局部発振回路２４の発振する局部発振信号と混合することによって、中間周波信号に変換し、これを、中間周波増幅器２５で増幅した後、検波回路２６に供給する。この検波回路２６は、これに入力される上記中間周波信号をＦＭ検波することにより可聴周波信号を再生し、これをミューティング回路（Attenuator）２７及び低周波増幅器２８を介して、スピーカ２９に供給する。
【００６８】
なお、上記局部振回路２４は、送信機側の高周波発振回路５と同様、ＰＬＬシンセサイザ回路構成のもので、このＰＬＬシンセサイザ回路２４の発振周波数は、ＣＰＵ３０によって制御される。ただし、ＣＰＵ３０は、基本的に、送信機側から上述した制御データを受信し、かつこの制御データの有する制御識別フラグにフラグ「１」が立っているとき、その制御データ本体部３０５に設定されているチャンネルデータに従って、上記ＰＬＬシンセサイザ回路２４の発振周波数うぇお調整し、受信チャンネルを設定する。
【００６９】
これを実現するために、受信機は、検波回路２６の出力側に、この検波回路２６によって検波して得た信号に含まれる上述したトーン信号を除去するためのトーン除去フィルタ３１を設けている。ＣＰＵ３０は、このフィルタ３１を介して上記制御データを取り込み、この取り込んだ制御データ（制御データ本体部３０５）に含まれる上記チャンネルデータに従って、ＰＬＬシンセサイザ回路２４を制御する。
【００７０】
なお、ＣＰＵ３０は、受信機自体の電源スイッチ３２をＯＮ状態からＯＦＦ状態に切り替える際に、その時点で上記ＰＬＬシンセサイザ回路２４の制御に使用しているチャンネルデータ、即ちその時点で通信に使用しているチャンネルに対応するチャンネルデータを、図示しないメモリ内に一時的に記憶するようにも構成されている。ただし、受信機が初期状態にあるとき、例えば工場出荷状態にあるときは、上記メモリ内には、所定のチャンネル、例えば上述したＢ６１チャンネルに対応するチャンネルデータが記憶されている。
【００７１】
ＣＰＵ３０には、受信機のボリュームを調節するためのボリューム調節部３３が接続されている。このボリューム調節部３３は、ボリュームアップボタン３３ａとボリュームダウンボタン３３ｂとから成り、これら各ボタン３３ａ、３３ｂを操作すると、ＣＰＵ３０は、その操作に応じて低周波増幅器２８の増幅率を制御する。ＣＰＵ３０は、上記フィルタ３１を介して制御データを取り込み、かつこの制御データの有する制御識別フラグに「０」が設定されているとき、その制御データ本体部３０５に設定されているボリューム調節データに応じて、上記低周波増幅器２８の増幅率（即ちボリューム）の調節を実行するようにも構成されている。
【００７２】
この受信機側においても、上記送信機と同様、この受信機に２桁の識別コードを任意に設定するためのコード設定部３４を設け、これをＣＰＵ３０に接続している。後述するが、ＣＰＵ３０は、このコード設定部３４によって設定して得た識別コードと、送信機側から送られてくる上記制御データに含まれる（識別コードデータ部３０３に設定されている）識別コードとが一致したときに初めて、上記制御データに含まれるチャンネルデータまたはボリューム調節データに応じた受信チャンネル設定またはボリューム調節を実行する。
【００７３】
上記検波回路２６の出力側には、この検波回路２６の出力を更に検波して上記トーン信号を検出するためのトーン検波回路３５を設けており、このトーン検波回路３５の出力を、ＣＰＵ３０に供給している。また、図１（ｂ）には図示していないが、ＣＰＵ３０は、この受信機と対を成す（即ちこの受信機と同一のシステムを構成する）送信機側から送られてくるトーン信号の周波数に対応するトーンデータを有している。そして、ＣＰＵ３０は、そのトーンデータに対応するトーン信号の周波数と、上記トーン検波回路３５によって検出して得たトーン信号の周波数とが一致し、かつ、上記コード設定部３４によって設定して得た識別コードと、送信機側から送られてくる上記制御データに含まれる識別コードとが一致したときに初めて、スピーカ２９の出力を有効とするように上記ミューティング回路２７を制御する。
【００７４】
ＣＰＵ３０には、中間周波増幅器２５による増幅後の中間周波信号も供給されており、ＣＰＵ３０は、この中間周波信号の信号レベルに応じても、上記ミューティング回路２７を制御し、即ち一般に知られているスケルチ動作を実行するよう構成されている。
【００７５】
受信機の外観を図５（ａ）に示す。受信機は、例えば据置型の偏平な直方体状のもので、背面２００側に受信アンテナ２１を有しており、前面２０１側に、上記ボリューム調節部３４やコード設定部３５等を備えた操作パネル２０２を有している。この操作パネル２０２上の上記コード設定部３５の部分を拡大した図を、図５（ｂ）に示す。
【００７６】
図５（ｂ）に示すように、コード設定部３５は、例えば上述した送信機側のコード設定部１３と同様、上記識別コードの１桁目（１０位）の数字と２桁目（１位桁）の数字とをそれぞれ別々に設定するための２つのスイッチ３５ａ、３５ｂにより構成されている。これらのスイッチ３５ａ、３５ｂもまた、上記送信機側のコード設定部１３を構成する各スイッチ１３ａ、１３ｂと同様のディジタルコード出力形式のものとされている。同図（ｂ）は、これら各スイッチ３５ａ、３５ｂにより、「２２」という識別コードを設定している状態を示す。
【００７７】
上記のように構成された受信機において、ＣＰＵ２２は、図６に示すフローチャートに従って動作する。なお、受信機は、先程まで、これと対を成す送信機との間で、或るチャンネルによる無線通信を行なっていた状態にあり、今現在は、送信機及び受信機共に、電源をＯＦＦしている状態にあるものとする。また、これら互いに対を成す送信機及び受信機には、それぞれ同じ識別コードが（コード設定部１３及び３４によって）設定されているものとする。
【００７８】
この状態で、受信機の電源（電源スイッチ３２）をＯＮすると、ＣＰＵ３０は、まず、スピーカ２９の出力を無効とする（即ちミュートＯＮする）ようにミューティング回路５０を制御する（ステップＳ５０）。
【００７９】
そして、ＣＰＵ３０は、前回電源をＯＦＦしたときに一時的に記憶したチャンネルデータ、即ち前回の通信に使用したチャンネルのデータを、上述したメモリ内から呼び出して、この呼び出したデータに基づいて、受信チャンネルを設定する（ステップＳ５２）。これにより、受信機は、前回の通信に使用したチャンネルによる無線通信（受信）を開始する。
【００８０】
送信機側の電源（電源スイッチ１１）をＯＮすると、送信機は、上述したように、前回使用したチャンネルによる無線通信（送信）を開始する。即ち、送信機は、まず、上述した図４に示す制御データを送信する。このとき、制御データの有する制御種別フラグ３０４には、フラグ「１」が立っており、制御データ本体部３０５には、グループ選択部９及びチャンネル選択部１０によって選択して得たチャンネルに対応するチャンネルデータが設定されている。
【００８１】
一方、受信機側においては、上記受信チャンネルにより何らかの電波を受信したか否かを監視している（ステップＳ５４）。そして、電波を受信した場合（ＹＥＳの場合）は、その電波により制御データを受信したか否かを確認すると共に、制御データを受信した場合には、それに含まれる（識別コードデータ部３０３に設定されている）識別コードが、受信機側の識別コードと一致するか否かを確認する（ステップＳ５６）。この識別コードが一致した場合（ＹＥＳの場合）は、上記制御データの制御種別フラグ３０４にフラグ「１」が立っているか否かを確認する（ステップＳ５８）。なお、これら各ステップＳ５４、Ｓ５６及びＳ５８において、いずれもＮＯの場合には、ステップＳ５４に戻る。
【００８２】
上記ステップＳ５８において、制御種別フラグ３０４にフラグ「１」が立っている場合（ＹＥＳの場合）は、制御データの制御データ本体部３０５に設定されているチャンネルデータが、現在の受信チャンネルに対応するチャンネルデータと同一であるか否かを確認する（ステップＳ６０）。これら両者が同一である場合、即ち今回も前回と同じチャンネルを用いて無線通信を行う場合（ＹＥＳの場合）には、次のステップＳ６２に進む。一方、上記各チャンネルデータが異なる場合（ＮＯの場合）は、ＣＰＵ３０は、上記制御データに含まれる（制御データ本体部３０５に設定されている）チャンネルデータに基づいて、これに対応する受信チャンネルに設定し直す（ステップＳ６４）。そして、ステップＳ５４に戻って、再度制御データを受信し直す状態になる。
【００８３】
上記ステップＳ６２においては、送信機側からトーン信号が送信されているか否かを確認すると共に、トーン信号が送信されてきている場合には、その周波数が、受信機側の有するトーンデータの表す周波数と一致するか否かを確認する。この確認が取れたときに初めて、ステップＳ２９の出力を有効とする（即ちミュートＯＦＦする）ようにミューティング回路２７を制御し、これによって送信機側との無線通信を可能とする（ステップＳ６６）。なお、ステップＳ６２において、上記各周波数が一致しないとき（ＮＯのとき）は、ＣＰＵ３０は、上記制御データが他のシステムの送信機から送られてきたものと判断して、ステップＳ５４に戻る。
【００８４】
ＣＰＵ３０は、無線通信中にあるとき、常に送信機側から電波が送られてきているか否か（ステップＳ６８）、及び上記トーン信号の周波数が一致するか否かを確認する（ステップＳ７０）。そして、これらの確認が取れている限り（ＹＥＳの場合）、無線通信状態を継続する。
【００８５】
ここで、送受信機間の通信チャンネルを変更する場合、送信機側において、グループ選択部９及びチャンネル選択部１０によって希望のチャンネルを選択した後、送信機の電源をＯＦＦする。これによって、受信機は、送信機側からの電波を受信しなくなるので（ステップＳ６８のＮＯ）、ＣＰＵ３０は、スピーカ２９の出力を無効とするようにミューティング回路２７を制御する（ステップＳ７２）。そして、再度、送信機側から電波が送信されているか否かを確認して（ステップＳ７４）、送信されていない場合（ＮＯの場合）には、ステップＳ５４に戻って、再度制御データを受信し直す状態になる。ここで、送信機側の電源を再度ＯＮすると、受信機側のＣＰＵ３０は、上記ステップＳ５４からの手順を繰り返して、送信機側から送られてくる制御データ（チャンネルデータ）に応じた受信チャンネルの設定を行う。
【００８６】
なお、送信機側の電源をＯＦＦする前に、上記グループ選択部９及びチャンネル選択部１０によって希望のチャンネルを選択するようにしたが、これとは反対に、送信機側の電源をＯＦＦし、この電源ＯＦＦの状態で希望のチャンネルを選択し、その後、電源を再度ＯＮしても、上記と同様の結果が得られる。
【００８７】
送受信期間で無縁通信を行っている最中に、例えば送信機側のボリューム調節部１２を操作したとする。この場合、上述したように、送信機側においては、一旦、トーン信号の送信を停止する。そして、制御データの制御種別フラグ３０４に「０」を設定すると共に、制御データ本体部３０５に上記ボリューム調節部１２の操作状態に応じたボリューム調節データを設定し、これを受信機側に送信する。この制御データの送信後は、通信可能状態に戻る。
【００８８】
これに対して、受信機側においては、上記ステップＳ７０において、トーン信号の受信を確認できなくなる（ＮＯに進む）ので、ステップＳ７２において、ミューティング２７によりスピーカ２９の出力を無効とする。そして、ステップＳ７４において、送信機側から少なくとも電波だけは発射されていること（ＹＥＳであること）を確認し、再度、トーン信号が送られてきているか否かを確認する（ステップＳ７６）。ここでは、ＣＰＵ３０は、トーン信号を確認できない（ステップＳ７６のＮＯである）ので、ステップＳ７８に進む。このステップＳ７８において、制御データが送られてきているか否か、及び送られてきている場合にはその制御データに含まれる識別コードが受信機側の識別コードと一致するか否かを確認し、識別コードが一致する場合（ＹＥＳの場合）にはステップＳ８０に進み、上記制御データの制御種別フラグ３０４が「０」であるか否かを確認する。これらの確認が取れたときに初めて、上記制御データに含まれるボリューム調節データに従って、実際のボリューム調節を実行する（ステップＳ８２）。
【００８９】
上記ステップＳ８２においてボリューム調節を行なった後、ＣＰＵ３０は、ステップＳ７４に戻る。このステップＳ７４において、送信機側から電波が発射されていること（ＹＥＳであること）を確認し、次のステップＳ７６において、送信機側からのトーン信号の送信が再開されたこと（ＹＥＳであること）を確認すると、ステップＳ６６に戻り、無線通信を再開する。なお、上記ステップＳ７８及びＳ８０において、いずれもＮＯの場合には、ステップＳ７４に戻る。
【００９０】
送受信期間で無縁通信を行っている最中に、例えばフェージング等の影響により、送信機から発射される電波を受信機側で受信できなくなったとする。この場合、ＣＰＵ３０は、ステップＳ６８において、ＮＯに進み、ステップＳ７２において、スピーカ２９の出力を無効とする。しかし、次のステップＳ７４において、再度送信機側から電波が発射されていること（ＹＥＳであること）を確認し、かつ、ステップＳ７６において、トーン信号を確認した場合には、ＣＰＵ３０は、ステップＳ６６に戻り、無線通信を再開する。
【００９１】
なお、例えば或るシステムを構成する送信機と受信機との組み合わせを変更した場合等は、送信機側のメモリ内に一時記憶されている（前回の通信に使用したチャンネルに対応する）チャンネルデータと、受信機側のメモリ内に一時記憶されている（前回の通信に使用したチャンネルに対応する）チャンネルデータとが、それぞれ異なることがある。このような場合、そのままの状態で、送受信機それぞれの電源をＯＮしても、これら送受信機間での無線通信を実現することはできない。これに対処するために、受信機側は、図示しないリセットスイッチを有しており、このリセットスイッチを押下することによって、受信機を工場出荷状態に戻すことができる。
【００９２】
即ち、送信機及び受信機それぞれに一時記憶されたチャンネルデータが異なる場合には、上記リセットスイッチにより受信機を一旦工場出荷状態に戻し、これによって、受信機側の受信チャンネルとして上述したＢ６１チャンネルを設定する。そして、送信機側においても、このＢ６１チャンネルを送信チャンネルとして設定し（詳しくは、グループ選択部９及びチャンネル選択部１０によってＢ６１チャンネルを選択し、その後、一旦、送信機側の電源をＯＮ→ＯＦＦする）、このＢ６１チャンネルにより無線通信を開始すればよい。これ以降、通信チャンネルを変更する場合には、上記と同様の手順を実行すればよい。
【００９３】
例えば図７に示すように、受信機側に、７セグメントＬＥＤから成る２つの表示器３６、３７を設け、これら各表示器３６、３７に、現在受信機側の上記メモリ内に一時記憶されているチャンネル（グループ番号及びチャンネル番号）を表示するよう構成してもよい。このようにすれば、送信機側と受信機側とにそれぞれ一時記憶された各チャンネルデータが異なっても、上記表示器３６、３７に表示されたチャンネルに合わせて送信機側のチャンネルを設定することによって、受信機側を工場出荷状態に戻すことなく、これら送受信機間での無線通信が可能となる。
【００９４】
また、送受信機間における上記制御データの送受信が良好に行われずに、受信機側のチャンネル設定が正常に成されないことが起こりうることを考慮して、例えば図８に示すように、受信機側に、例えば押しボタン構成のグループ選択部３８とチャンネル選択部３９とを設けてもよい。即ち、グループ選択部３８を操作（押下）することによって、希望のグループを選択できると共に、その選択して得たグループ番号が、表示器３６に表示されるように構成する。そして、チャンネル選択部３９を操作（押下）することによって、希望のチャンネルを選択できると共に、その選択して得たチャンネル番号が、表示器３７に表示されるように構成する。
【００９５】
なお、上記各選択部３８、３９の操作に応じてグループ及びチャンネルを選択する手段、及びこれら各選択部３８、３９の操作に応じて上記各表示器３６、３７の表示状態を制御する手段は、ＣＰＵ３０によって実現する。この場合、上記各選択部３８、３９の操作に応じたチャンネル周波数を生成する（即ちＰＬＬシンセサイザ回路２４の発振周波数を制御する）ためのチャンネルデータを、上述したメモリ内に記憶しておく必要がある。上記各選択部３８、３９として、押しボタンを採用したのは、送信機側から送られてくる制御データ（チャンネルデータ）によって、受信機側の受信チャンネルが変更されるからである。即ち、送信機側の各選択部９、１０に採用しているディジタルコード出力形式のスイッチは、スイッチとしての機能を有すると同時に、それ自体の非操作状態を表示する機能をも合わせ持つ。従って、このようなスイッチを上記各選択部３８、３９に採用した場合、これら各選択部３８、３９を構成する各スイッチが表すグループ番号及びチャンネル番号と、実際に設定されている受信チャンネルのグループ番号及びチャンネル番号とに、差異が生じる場合があるからである。
【００９６】
上記のように、本実施の形態によれば、送信機側において、希望の通信（送信）チャンネルを選択すると、これに応じて受信機側の受信チャンネルが自動的に切り替わる。従って、受信機側において、チャンネル設定を行う手間が省ける。これは、送受信機間の距離が離れている等の理由により、送信機及び受信機それぞれにおけるチャンネルの設定状況を互いに（目や耳で）直接確認できない場合等に、特に有効である。
【００９７】
また、送信機及び受信機共に、それぞれの電源をＯＦＦする際、それまでに使用していたチャンネルのデータを記憶する。そして、再度電源をＯＮしたとき、その記憶したチャンネル、即ち前回使用したチャンネルにより無線通信を開始する。よって、特に、前回使用したのと同じチャンネルを用いて無線通信を行う場合等に、送受信機それぞれの立ち上がり時間を短縮できる。
【００９８】
そして、送信機側には、通信チャンネルを選択する手段として、グループ選択部９とチャンネル選択部１０とを、それぞれ別個に設けている。従って、本実施の形態のシステムを複数台、同じ場所で同時に使用する場合には、各システムの各送信機側で、それぞれ同一グループ内の異なるチャンネルを選択すれば、これら各システム間で、上述した変調や相互変調等の電波障害が発生するのを防止できる。
【００９９】
また、上述した図３に示すフローチャートによれば、送信機側のＣＰＵ８は、送信チャンネルを切り替えるとき、送信機の出力（ＲＦ出力）をＯＦＦする。従って、送信チャンネルが切り替わる際に生じる送信周波数の経時的変化によって、他のシステムに対して電波妨害を与えることもない。
【０１００】
更に、本実施の形態によれば、受信機側のチャンネル設定のみならず、ボリューム調節についても、これを送信機側から制御できる。従って、本実施の形態のシステムを使用するエリア内において、一人でボリューム調節を行う場合等に、特に有効である。
【０１０１】
そして、送信機及び受信機の両方にそれぞれ任意に付与した識別コードを照合して同じシステムを構成する送受信機の組み合わせを確認してから、上記チャンネル設定やボリューム調節、或いはミューティング回路２７によるミュートＯＦＦ制御を行う。従って、他のシステムとの混信を防止できると共に、他のシステムの送信機によって受信機側のボリュームが不本意に変更されるのを防止でき、ひいては通信の信頼性が向上するという効果がある。
【０１０２】
なお、本実施の形態における送信機側の変調器４、電力増幅器６及び送信アンテナ７により構成される部分が、特許請求の範囲に記載の送信手段に対応し、送信機側のＣＰＵ８が有するメモリが、データ記憶手段及び送信チャンネル記憶手段に対応する。そして、グループ選択部９及びチャンネル選択部１０が、特許請求の範囲に記載の選択手段に対応し、これらグループ選択部９及びチャンネル選択部１０により、それぞれグループ及びチャンネルを選択することが、特許請求の範囲に記載のグループ選択指令及び個別チャンネル選択指令に対応する。また、送信機側の電源スイッチ１１が、特許請求の範囲に記載の切替手段に対応し、この電源スイッチ１１のＯＮ状態が、第１の状態に対応し、ＯＦＦ状態が第２の状態に対応する。そして、ＣＰＵ８が、特許請求の範囲に記載の送信制御手段に対応する。また、送信機側のコード設定部１３が、特許請求の範囲に記載の第１、第２及び第３の送信機側識別記号設定手段に対応し、このコード設定部１３によって設定して得た識別コードが、第１、第２及び第３の送信機側識別記号に対応する。そして、本実施の形態におけるボリューム調節データが、特許請求の範囲に記載の命令データに対応する。
【０１０３】
また、受信機側の受信アンテナ２１、高周波増幅器２２及び混合器２３により構成される部分（若しくは、これらに中間周波増幅器２５、検波回路２６、低周波増幅器２８及びスピーカ２９を含む部分）が、特許請求の範囲に記載の受信手段に対応し、ミューティング回路２７が、ミューティング手段に対応する。そして、受信機側のＣＰＵ３０が、受信制御手段及びミューティング制御手段に対応し、このＣＰＵ３０の有するメモリが、特許請求の範囲に記載の受信チャンネル記憶手段に対応する。更に、受信機側のコード設定部３４が、特許請求の範囲に記載の第１、第２及び第３の受信機側識別記号設定手段に対応し、このコード設定部３４によって設定して得た識別コードが、第１、第２及び第３の受信機側識別記号に対応する。
【０１０４】
本実施の形態では、本発明を８００ＭＨｚ帯のＦＭワイヤレス・マイクロホン・システムに応用する場合について説明したが、これ以外の周波数帯域、例えば７０ＭＨｚ帯や３００ＭＨｚ帯のワイヤレスシステムに、本発明を応用してもよい。また、ＦＭ方式のワイヤレスシステムについて説明したが、ＡＭ（振幅変調）式等、他の変調方式のワイヤレスシステムに本発明を応用してもよい。更に、音声以外の例えばデータ通信を行うシステムにも、本発明を応用できる。
【０１０５】
また、本実施の形態では、送信機及び受信機の両方に、任意の識別コードを設定し、この識別コードを照合することにより、送受信機の組み合わせを確認するように構成したが、この確認が不要な場合には、上記識別コードを設定するためのコード設定部１３、３４を設けなくてもよい。ただし、本実施の形態のように上記識別コードによって、送受信機の組み合わせを確認した方が、通信の信頼性が向上する。
【０１０６】
そして、送信機側から受信機側のボリューム調節を実現できるよう構成したが、これ以外の機能、例えば受信機側の音色調節やスケルチ調節、或いは受信機がこれに接続可能な外部周辺機器を制御するための外部制御端子を備えている場合には、この外部制御端子を介して上記外部周辺機器を制御する機能等をも、送信機側から遠隔制御できるように構成してもよい。
【０１０７】
更に、送信機側においては、電源スイッチ１１により、特許請求の範囲に記載の切替手段に対応するものを構成したが、電源スイッチ１１以外のもので、上記切替手段に対応するものを構成してもよい。
【０１０８】
そして、送信機側のＣＰＵ８については、図３のフローチャートに従って動作するよう構成し、受信機側のＣＰＵ３０については、図６のフローチャートに従って動作するよう構成したが、これに限らない。即ち、本実施の形態と同様の作用及び効果を奏するのであれば、上記図３及び図６の各フローチャート以外の手順により、各ＣＰＵ８、３０を制御してもよい。
【０１０９】
また、受信機側のコード設定部３４を、図５（ｂ）に示すように、２つのディジタルコード出力形式のスイッチ３４ａ、３４ｂにより構成したが、これに限らない。例えば、図９に示すように、上記各スイッチ３４ａ、３４ｂに代えて、２つの押しボタンスイッチ３４ｃ、３４ｄを設けると共に、これら各スイッチ３４ｃ、３４ｄの各操作に応じた数値を表示する７セグメントＬＥＤ構成の２つの表示器３４ｅ、３４ｆを設けてもよい。
【０１１０】
更に、本実施の形態では、ミューティング回路２７制御用の信号の一つとして、トーン信号を用いたが、これに代えて、上述した社団法人電波産業会の定める認定番号、即ちＩＤ番号を用いてもよい。なお、このＩＤ番号は、これを送信機側から送信することが義務付けられているので、厳密には、図３に示すフローチャートに、このＩＤ番号を送信するステップを設けなければならない。しかし、このＩＤ番号は、これを受信機側で処理しなければならないという規定は特になく、また、本実施の形態に直接関係しないので、本実施の形態では、その説明を省略する。
【０１１１】
【発明の効果】
以上のように、請求項１に記載の発明の送信機によれば、希望のチャンネルを選択する旨の通信チャンネル選択指令を与えると共に、切替手段を「第１の状態」→「第２の状態」→「第１の状態」と切り替えると、この送信機とその通信相手である受信機との両方の通信チャンネルが、上記希望のチャンネルに切り替わる。このように、送信機側でチャンネル設定を行なえば、これに応じて受信機側のチャンネルも自動的に設定されるので、受信機側でチャンネルを設定する手間が省けるという効果がある。この効果は、送受信機間の距離が離れている等の理由により、送信機及び受信機それぞれにおけるチャンネルの設定状況を互いに（目や耳で）直接確認できない場合等に、特に有効である。
【０１１２】
請求項２に記載の発明の送信機によれば、この送信機で使用可能な各チャンネルを、それぞれ同じ領域内で同時に使用しても混信や相互変調等の影響を受けないもの毎にグループ化している。従って、この送信機を有するワイヤレスシステムを複数台、同じ場所で同時に使用する場合には、各送信機で、それぞれ同一グループ内の異なるチャンネルを選択すれば、各システム間における上記変調や相互変調等の電波障害の発生を防止できるという効果がある。
【０１１３】
請求項３に記載の発明の送信機によれば、通信チャンネルが切り替わるとき、電波の発射を一時停止する。即ち、チャンネルの切り替わり時においては、周波数が経時的に変化するので、このとき、電波を発射したままの状態にしておくと、この電波が、他のシステムに対して妨害電波として作用する恐れがある。しかし、本請求項３に記載の発明によれば、上記のようにチャンネルの切り替わり時において、電波の発射が一時的に停止されるので、他システムに対する電波妨害を防止できるという効果がある。
【０１１４】
請求項４に記載の発明の送信機は、切替手段を、電源スイッチ手段により兼用するものである。従って、この電源スイッチ手段とは別に、切替手段を設ける必要がなく、その分、部品点数を削減できるという効果がある。
【０１１５】
請求項５に記載の発明の送信機によれば、通信相手となる受信機側の各種機能、例えばボリューム調節やトーン調節、或いはスケルチ調節等の各種調節機能、更には受信機に接続される外部周辺機器を制御するための機能等を、本請求項５に記載の発明の送信機により制御できる。従って、作業者１人では良好なボリューム調節等を実現できないという従来の問題点を解決できることは勿論のこと、これ以外の受信機側の各機能を遠隔制御できるという効果がある。
【０１１６】
請求項６に記載の発明のワイヤレスシステムは、請求項１、２、３または４に記載の発明の送信機と、これと無線通信が可能な受信機と、から成るものである。従って、上記請求項１、２、３または４に記載の発明と同様の効果を奏する。また、受信機側に、独自にチャンネルを設定する手段や、上述した所定のチャンネルを除く各チャンネルデータを記憶するための手段を設ける必要がない。よって、その分、受信機の構成を簡素化できるという効果もある。
【０１１７】
請求項７に記載の発明のワイヤレスシステムは、請求項５に記載の発明の送信機と、これと無線通信が可能な受信機と、から成るものである。従って、上記請求項５に記載の発明と同様の効果を奏する。また、上記請求項６に記載の発明と同様、受信機側に、独自にチャンネルを設定する手段や、所定のチャンネルを除く各チャンネルデータを記憶するための手段を設ける必要もない。
【０１１８】
請求項８に記載の発明のワイヤレスシステムは、上記請求項７に記載の発明において、送信機及び受信機の両方にそれぞれ識別記号を付与したものである。そして、これら送信機及び受信機にそれぞれ付与した識別番号を照合し、これによって同じシステムを構成する送受信機の組み合わせを確認してから、送信機による受信機側の各種機能の制御を実現する。従って、例えば、或るシステムの受信機に対して、他システムの送信機から何らかの機能を制御する旨の信号（即ち命令データ）が送られてきても、その信号によって上記或る受信機側の機能が不本意に制御されるのを防止できるという効果がある。
【０１１９】
請求項９に記載の発明のワイヤレスシステムによれば、送信機及び受信機の両方にそれぞれ付与した識別記号を照合して同じシステムを構成する送受信機の組み合わせを確認してから、受信機自体の出力をＯＮし、これによって初めて送受信機間での無線通信を可能としている。従って、例えば送信機側の電源がＯＦＦ状態にある無信号時において、他システムとの混信を防止でき、よって通信の信頼性が向上するという効果がある。これは、例えば、複数台のワイヤレスシステムを、略同一エリア内で同時に使用する場合等に、非常に有効である。
【０１２０】
請求項１０に記載の発明のワイヤレスシステムによれば、送信機及び受信機の両方にそれぞれ付与した識別記号を照合して同じシステムを構成する送受信機の組み合わせを確認してから、受信機側のチャンネル設定を行うようにしている。従って、例えば、或るシステムの受信機に対して、他システムの送信機から通信チャンネルを変更する旨の信号（即ちチャンネルデータ）が送られてきても、その信号によって上記或るシステムの受信機の受信チャンネルが不本意に変更されるのを防止できるという効果がある。
【０１２１】
請求項１１に記載の発明のワイヤレスシステムによれば、受信機は、その電源スイッチ手段をＯＦＦしても、初期状態に戻ることはなく、再度電源スイッチ手段をＯＮしたときに、それまでに使用していたチャンネルによる無線通信を継続する。これに対して、上記請求項６に記載の発明によれば、受信機の電源をＯＦＦした時点で、受信機が初期状態に戻るので、受信機の電源を再度ＯＮしたときに、一旦、上述した所定のチャンネルによる無線通信を行う必要がある。従って、本請求項２に記載の発明によれば、受信機の電源を一旦「ＯＦＦ」→「ＯＮ」したときの上記所定のチャンネルによる無線通信動作を省くことができ、その分、希望のチャンネルによる無線通信が可能となるまでの時間を短縮できる。これは、前回（即ち受信機の電源をＯＦＦする以前に）使用したのと同じチャンネルを用いて無線通信を再開する場合等に特に有効である。
【図面の簡単な説明】
【図１】本発明の一実施の形態を示す図で、（ａ）は、送信機側の概略ブロック図、（ｂ）は、受信機側の概略ブロック図である。
【図２】同実施の形態における送信機の説明図で、（ａ）は、送信機を側面から見た外観図、（ｂ）は、送信機内部の部分拡大図である。
【図３】同実施の形態における送信機側のＣＰＵの動作を表わすフローチャートである。
【図４】同実施の形態において、送信機側から受信機側に送信する制御データのフレームフォーマットである。
【図５】同実施の形態における受信機の説明図で、（ａ）は、受信機の概観斜視図、（ｂ）は、操作パネルの部分拡大図である。
【図６】同実施の形態における受信機側のＣＰＵの動作を表わすフローチャートである。
【図７】同実施の形態における受信機側の改良例を示す図で、操作パネルの部分拡大図である。
【図８】図７とは別の改良例を示す図である。
【図９】図５（ｂ）の別の例を示す図である。
【符号の説明】
１ マイクロホン
４ 変調器
５、２４ ＰＬＬシンセサイザ回路
７ 送信アンテナ
８、３０ 中央演算処理装置（ＣＰＵ）
９ グループ選択部
１０ チャンネル選択部
１２ ボリューム設定部
２１ 受信アンテナ
２３ 混合器[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless transmitter capable of switching communication channels (hereinafter simply referred to as a transmitter), and a wireless system in which a wireless receiver (hereinafter simply referred to as a receiver) is combined.
[0002]
[Prior art]
As a wireless system capable of switching communication channels as described above, for example, a system using a phase locked loop (hereinafter referred to as PLL) synthesizer circuit as an oscillation circuit that determines the frequency of a channel used for wireless communication is known. ing. According to such a wireless system, the user of the system can arbitrarily set a communication channel (from among a plurality of channels assigned to this system) by changing the oscillation frequency of the PLL synthesizer circuit. Therefore, if radio interference such as interference occurs with other systems during wireless communication using a certain channel, the effect is avoided by switching to another channel. it can.
[0003]
In the conventional wireless system, means for setting the communication channel is provided separately for both the transmitter and the receiver. Therefore, according to the conventional wireless system, it is possible to perform wireless communication between the transmitter and the receiver only by setting the same channel to each other.
[0004]
[Problems to be solved by the invention]
However, as described above, when performing wireless communication, it is very troublesome that channel settings must be performed separately in both the transmitter and the receiver. In particular, it is inconvenient for the above channel setting work when the channel setting status in each of the transmitter and the receiver cannot be confirmed directly (by eyes or ears) due to a distance between the transmitter and the receiver. Produce.
[0005]
In addition, if radio interference such as interference occurs with other systems as described above, if the channel is switched randomly, for example, radio interference other than the interference such as intermodulation newly occurs. There is also a problem of getting.
[0006]
Furthermore, in the conventional wireless system, for example, various adjustment functions such as volume (volume) adjustment, tone (TONE) adjustment, squelch adjustment, and the like are provided on the receiver side. Therefore, in order to perform these adjustments satisfactorily, for example, a total of two people, a person who speaks while actually carrying the transmitter in the use area of this system, and a person who performs each of the above adjustments at the receiver side. Workers are required. Of course, even one worker can make each of the above adjustments, but in this case, good adjustment cannot be expected.
[0007]
Therefore, the present invention automatically sets the channel on the receiver side based on the transmitter that can transmit data necessary for channel setting to the receiver side by wireless communication, and the data given from the transmitter side. An object of the present invention is to provide a wireless system capable of performing the above. In addition, when performing this channel setting, it is possible to realize a channel setting that does not cause radio interference such as interference and intermodulation with other systems. It is also an object of the present invention to allow various adjustment functions on the side to be controlled from the transmitter side.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, the invention according to claim 1 of the present invention includes a transmission means for performing wireless communication using a set channel,
Data storage means for storing a plurality of channel data respectively corresponding to channels that can be set in the transmission means;
Selection means for selecting any of the channel data stored in the data storage means in accordance with a communication channel selection command given from the outside;
Switching means capable of arbitrarily switching between the first state and the second state;
Transmission channel storage means for storing channel data corresponding to the channel set in the transmission means at that time when the switching means switches from the first state to the second state;
When the switching means switches from the second state to the first state, the channel data currently stored in the transmission channel storage means and the channel data selected by the selection means are the same. When the channel corresponding to the channel data stored in the transmission channel storage means is set in the transmission means and the channel data is transmitted, wireless communication is possible using the set channel, and the switching means is When the channel data stored in the transmission channel storage means at that time and the channel data selected by the selection means are different when switching from the second state to the first state, the transmission channel storage means The channel corresponding to the channel data stored in After the channel data selected by the selection means is transmitted, the channel corresponding to the channel data selected by the selection means is set in the transmission means and set. Transmission control means for controlling the transmission means in a state enabling wireless communication by channel;
It comprises.
[0009]
Note that, as a receiver that is a communication partner of the transmitter according to the first aspect of the present invention, for example, a receiving unit that selects and receives a signal of a set channel, and a predetermined unit in the receiving unit only in an initial state. Thereafter, when the receiving means receives the channel data sent from the transmitter, the receiving means sets the channel corresponding to the received channel data in the receiving means. And a control means.
[0010]
The initial state of the receiver is, for example, that the receiver is in a state substantially equivalent to the factory shipment state, or that the receiver is in a state immediately after turning on (ON) its own power. To tell. When the transmitter is in this initial state, it is assumed that some channel data, for example, channel data corresponding to the predetermined channel is stored in advance in the transmission channel storage means.
[0011]
For example, wireless communication using a certain channel is currently being performed between the transmitter according to the first aspect of the present invention and a receiver that is a communication partner of the transmitter. Suppose that it is in the state of 1. To change the communication channel in this state, first, on the transmitter side, a command for selecting the desired communication channel to be changed is input as the communication channel selection command. As a result, the selection means selects the channel data corresponding to the desired communication channel from the data storage means. Here, when the switching unit is switched to the second state, the channel data corresponding to the channel set in the transmission unit at that time, that is, the certain channel used for wireless communication is transmitted to the transmission channel storage unit. Is temporarily stored. Then, when the switching means is returned to the first state again, the transmission control means selects the channel data stored in the transmission channel storage means at that time and the channel data selected by the selection means. Compare. Here, since these two channel data are different, the transmission control means uses the channel corresponding to the channel data stored in the transmission channel storage means, that is, the certain channel used for communication until now, The transmission means is controlled to transmit the channel data selected by the selection means to the receiver side. After that, the transmission control unit newly sets the channel corresponding to the channel data selected by the selection unit to the transmission unit, and enables wireless communication using the newly set channel. To do. On the other hand, since the receiver side is in a state of performing wireless communication through the certain channel, the channel data transmitted from the transmitter side is received through this certain channel. Then, the reception control means sets the channel corresponding to the channel data obtained by this reception, that is, the same channel newly set again on the transmitter side as a new reception channel in the reception means. It enables wireless communication using a newly set channel. Thereby, the operation of changing the communication channel between the transceivers is completed.
[0012]
Note that immediately before returning the switching means from the second state to the first state again, for example, the selection means reselects the original channel data (that is, corresponding to the certain channel), and then the switching means is changed. Suppose that it returned to the 1st state. In this case, since the channel data stored in the transmission channel storage means and the channel data selected by the selection means are the same, the transmission control means uses the above-mentioned certain data used for communication until now. The channel is set as the transmission means again. Then, after transmitting the channel data corresponding to the channel to the receiver side, the wireless communication by the certain channel is continuously enabled. On the other hand, the receiver side receives the channel data transmitted from the transmitter side through the certain channel. Then, the reception control means sets the channel corresponding to the channel data obtained by this reception, that is, the certain channel again as the receiving means, and subsequently enables wireless communication through this certain channel. That is, when the switching means is returned from the second state to the first state again, the channel data stored in the transmission channel storage means and the channel data selected by the selection means are the same. However, the communication channel between the transceivers is unchanged. This means that the switching means is changed from “first state” to “second state” to “second state” without changing the channel data selected by the selection means (that is, without giving any communication channel selection command). The same applies when switching to the “1 state”.
[0013]
When at least one of the transmitter and the receiver is in the initial state, both the transmitter and the receiver are returned to the initial state. In this way, first, wireless communication using the predetermined channel is performed, and thereafter, the same operation as described above is executed.
[0014]
The invention according to claim 2 is the transmitter of the invention according to claim 1,
The data storage means stores each channel data in a grouped state corresponding to channels that can be simultaneously used in substantially the same area when performing wireless communication,
The communication channel selection command consists of a group selection command and an individual channel selection command,
The selection means is configured to select channel data corresponding to the individual channel selection command in a group corresponding to the group selection command from among the grouped channel data.
[0015]
Note that the channels that can be used simultaneously in substantially the same area when performing the above-described wireless communication are that the same channel is not used in each system even if a plurality of wireless systems are simultaneously used in the substantially same area. As far as this is concerned, it refers to a channel that does not cause radio interference such as interference and intermodulation. In addition, the meaning of the substantially same area includes the meaning of areas close to each other.
[0016]
According to the second aspect of the present invention, even if each channel that can be used (set) by this transmitter (that is, assigned to the transmitter) is used in the same region at the same time, Groups that are not affected by intermodulation are grouped together. Therefore, when preparing a plurality of wireless systems having this transmitter and using them simultaneously in the same place, a common (identical) group selection command is given to each selection means of each transmitter. Different individual channel selection commands may be given. As a result, in each system, communication is performed using different channels within the same group. Therefore, radio interference such as interference and intermodulation does not occur between the systems.
[0017]
According to a third aspect of the present invention, in the transmitter according to the first or second aspect, when the transmission control unit changes a channel set in the transmission unit, the wireless communication by the transmission unit is temporarily stopped. It is comprised in the state to be made to.
[0018]
According to the third aspect of the present invention, when the channel used for wireless communication is switched, the wireless communication by the transmission unit is temporarily stopped. Therefore, radio waves are not emitted from the transmitter when this channel is switched.
[0019]
According to a fourth aspect of the present invention, in the transmitter according to the first, second, or third aspect, the switching unit is a transmitter-side power switch unit that turns on / off the power of the transmitter itself. The ON state of the transmitter side power switch means is the first state, and the OFF state of the transmitter side power switch means is the second state.
[0020]
That is, according to the present invention, the switching means is constituted by a power switch means. Needless to say, when the switching means is in the second state, that is, when the transmitter-side power switch means is in the OFF state, no radio wave is emitted from the transmitter.
[0021]
The invention according to claim 5 comprises command input means for inputting a command for controlling a predetermined function on the receiver side in the transmitter of the invention according to claim 1, 2, 3 or 4. When the command is input from the command input unit, the transmission control unit is configured to transmit command data representing the content of the command by the transmission unit.
[0022]
In addition to the receiving means and the receiving control means, for example, when the command data is received by the receiving means, the receiver as a communication partner of the transmitter according to the fifth aspect of the invention receives this reception. In accordance with the command data obtained in this manner, a device provided with function control means for controlling a predetermined function of the receiver is used.
[0023]
The predetermined function on the receiver side mentioned here refers to various adjustment functions such as volume adjustment, tone color adjustment, or squelch adjustment function. In addition, when the receiver includes a so-called external control terminal for controlling an external peripheral device that can be connected to the receiver, for example, the function of controlling the external peripheral device via the external control terminal, etc. One of the predetermined functions can be included.
[0024]
That is, according to the fifth aspect of the present invention, when a command for controlling a predetermined function of a receiver as a communication partner is input by the command input unit, the transmission unit displays the command data representing the command content. Is sent to the receiver. On the receiver side that has received the command data, the function control means implements predetermined functions of the receiver, such as various adjustments and control of external peripheral devices, according to the received command data.
[0025]
The invention described in claim 6 is a wireless system comprising the transmitter of the invention described in claim 1, 2, 3 or 4, and a receiver,
The receiver selects and receives a signal of the set channel, and sets a predetermined channel in the receiver only in the initial state. Thereafter, the receiver transmits from the transmitter side. Receiving control means for setting a channel corresponding to the received channel data in the receiving means when receiving the received channel data.
[0026]
That is, the invention described in claim 6 is a transmitter capable of wireless communication with the transmitter of the invention described in claim 1, 2, 3 or 4 (including the receiving means and the receiving control means). Machine.
[0027]
According to the sixth aspect of the present invention, channel data corresponding to all channels that can be used (set) in this wireless system (that is, assigned to the system) is stored in the data storage means on the transmitter side. Only remember. Then, among the channel data stored in the data storage means, the channel data corresponding to the desired channel is transmitted to the receiver side, and the reception channel on the receiver side is set based on this channel data. Each channel data stored in the data storage means is shared by the transmitter and the receiver. Therefore, it is not necessary to provide storage means such as the data storage means on the receiver side (other than the means for storing channel data corresponding to the predetermined channel).
[0028]
A seventh aspect of the invention is a wireless system comprising the transmitter of the fifth aspect of the invention and a receiver.
The receiver selects and receives a signal of the set channel, and sets a predetermined channel in the receiver only in the initial state. Thereafter, the receiver transmits from the transmitter side. Receiving control means for setting the channel corresponding to the received channel data in the receiving means when receiving the received channel data, and receiving the command data when the receiving means receives the command data. And a function control means for controlling the predetermined function of the receiver in accordance with the obtained command data.
[0029]
That is, the invention described in claim 7 is a transmitter according to the invention described in claim 5, and a receiver capable of wireless communication with the transmitter (provided with the receiving means, the reception control means, and the function control means) , Is made up of.
[0030]
In the invention described in claim 7, as in the invention described in claim 6, the data storage (other than the means for storing channel data corresponding to a predetermined channel) is stored on the receiver side. There is no need to provide storage means such as means.
[0031]
The invention of claim 8 is the wireless system of the invention of claim 7,
The transmitter includes first transmitter-side identification symbol setting means for setting an arbitrary first transmitter-side identification symbol in the transmitter, and the transmission control means causes the transmission means to transmit the command data. At the same time, the first identification data representing the first transmitter side identification symbol is also transmitted.
The receiver includes first receiver-side identification symbol setting means for setting an arbitrary first receiver-side identification symbol in the receiver, and the reception control means receives the command data by the receiving means. Command data obtained by receiving only when the first transmitter-side identification symbol and the first receiver-side identification symbol represented by the first identification data sent at the same time coincide with each other. Accordingly, the function control means is configured to control the predetermined function of the receiver.
[0032]
According to the eighth aspect of the present invention, the first transmitter side identification symbol set by the first transmitter side identification symbol setting means on the transmitter side, and the first receiver side identification on the receiver side. Only when the first receiver side identification symbol set by the symbol setting means matches, the function control means controls a predetermined function on the receiver side in accordance with the command data sent from the transmitter side. Therefore, even if a receiver of a certain system receives command data from a transmitter of another system, the first transmitter-side identification number is not set in the transmitter of the other system, or the transmission of the other system Even if the first transmitter side identification number is set in the receiver, if it is different from the first receiver side identification number set in the receiver of the certain system, The predetermined function of the receiver is not controlled by command data sent from the transmitter of the other system. That is, after a combination of a transmitter and a receiver constituting the wireless system is confirmed by the identification symbol, control of a predetermined function on the receiver side by the transmitter is realized.
[0033]
The invention according to claim 9 is the wireless system according to claim 6, 7 or 8, wherein
The transmitter includes a second transmitter-side identification symbol setting unit for setting an arbitrary second transmitter-side identification symbol in the transmitter, and the transmission control unit causes the transmission unit to transmit the channel data. At the same time, the second identification data representing the second transmitter side identification symbol is also transmitted.
The receiver sets a second receiver side identification symbol setting means for setting an arbitrary second receiver side identification symbol thereto, and muting for turning ON / OFF the output of the receiver itself according to a muting control signal And the second transmitter-side identification symbol and the second receiver-side identification symbol represented by the second identification data sent simultaneously with the reception of the channel data by the receiving unit. And muting control means for generating the muting control signal in a state in which the output of the receiver itself is turned on only when they match.
[0034]
According to the ninth aspect of the present invention, the second transmitter side identification symbol set by the second transmitter side identification symbol setting means on the transmitter side, and the second receiver side identification on the receiver side. Only when the second receiver-side identification symbol set by the symbol setting means matches, the muting control means controls the muting means to turn on the output of the receiver itself (ie, voice output) ( Specifically, a muting control signal for realizing this control is generated). Accordingly, even if a radio wave (with the same channel as the communication channel of the certain system) is transmitted from the transmitter of the other system to the receiver of the certain system, the second transmission is performed to the transmitter of the other system. Even if the machine-side identification number is not set or the second transmitter-side identification number is set for the transmitter of the other system, it is the second set for the receiver of the certain system. If it is different from the receiver-side identification number, the output of the receiver itself is not turned on only by the radio wave transmitted from the transmitter of this other system. That is, after the combination of the transmitter and the receiver constituting the wireless system is confirmed by the identification symbol, wireless communication between these transceivers becomes possible.
[0035]
The second transmitter-side identification number setting means (second transmitter-side identification number) in the invention according to claim 9 and the first receiver-side identification symbol in the invention according to claim 8 The setting means (first receiver side identification symbol) may be the same. The second receiver side identification number setting means (second receiver side identification number) in the invention described in claim 9 is also used for the first receiver side identification in the invention described in claim 8. It may be the same as the symbol setting means (first receiver side identification symbol).
[0036]
The invention described in claim 10 is the wireless system of the invention described in claim 6, 7, 8 or 9,
The transmitter includes third transmitter-side identification symbol setting means for setting an arbitrary third transmitter-side identification symbol in the transmitter, and the transmission control means causes the transmission means to transmit the channel data. At the same time, the third identification data representing the third transmitter side identification symbol is also transmitted.
The receiver includes third receiver-side identification symbol setting means for setting an arbitrary third receiver-side identification symbol in the receiver, and the reception control means receives the channel data by the receiving means. Only when the third transmitter-side identification symbol and the third receiver-side identification symbol represented by the third identification data transmitted at the same time coincide with each other, the received channel data is It is characterized in that the corresponding channel is set in the receiving means.
[0037]
According to the tenth aspect of the present invention, the third transmitter side identification symbol set by the third transmitter side identification symbol setting means on the transmitter side, and the third receiver side identification on the receiver side. Only when the third receiver-side identification symbol set by the symbol setting means matches is wireless communication on the channel corresponding to the channel data possible. Therefore, even if a receiver of a certain system receives channel data from a transmitter of another system, the third transmitter-side identification number is not set in the transmitter of the other system, or the transmission of the other system Even if the third transmitter side identification number is set in the receiver, if it is different from the third receiver side identification number set in the receiver of the certain system, The receiving channel of the receiver is not changed. That is, after the combination of the transmitter and the receiver constituting the wireless system is confirmed by the identification symbol, the channel setting on the receiver side is made.
[0038]
The third transmitter-side identification number setting means (third transmitter-side identification number) in the invention according to claim 10 and the first receiver-side identification symbol in the invention according to claim 8 The setting means (first receiver-side identification symbol) or the second receiver-side identification symbol setting means (second receiver-side identification symbol) in the invention of claim 9 is the same. May be. Further, the third receiver side identification number setting means (third receiver side identification number) in the invention described in claim 10 is also used for the first receiver side identification in the invention described in claim 8. It is the same as the symbol setting means (first receiver side identification symbol) or the second receiver side identification symbol setting means (second receiver side identification symbol) in the invention of claim 9. Also good.
[0039]
The invention of claim 11 is the wireless system of the invention of claim 6, 7, 8, 9 or 10,
The receiver side power switch means for turning on / off its own power supply, and the receiver side power switch means is set to the reception means at the time when the receiver side power switch means is switched from the ON state to the OFF state. Reception channel storage means for storing channel data corresponding to the channel, and the reception control means is stored in the reception channel storage means when the receiver-side power switch means is switched from the OFF state to the ON state. The channel corresponding to the existing channel data is set in the receiving means.
[0040]
That is, in the invention described in claim 11, for example, it is assumed that wireless communication using a certain channel is currently performed between the transceivers. In this state, when the power switch means on the receiver side is turned off, the channel data set for the receiving means at that time, that is, the channel data corresponding to the certain channel used for wireless communication is stored in the receiving channel storage means. Temporarily stored. Then, when the receiver-side power switch means is turned on again, the reception control means at that time corresponds to the channel data corresponding to the channel data stored in the reception channel storage means, that is, the above-described communication used so far. A certain channel is set as a receiving means. Therefore, even if the power switch means is turned off, the receiver does not return to the initial state described above, and when the power switch means is turned on again, the wireless communication using the channel used so far is continued. It becomes.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the present invention is applied to, for example, an 800 MHz band wireless microphone system will be described with reference to FIGS.
[0042]
FIG. 1 is a diagram showing a schematic configuration of the present embodiment, where (a) is a block diagram on the transmitter side and (b) is a block diagram on the receiver side. As shown in FIG. 5A, on the transmitter side, the audio signal output from the microphone 1 is amplified by the low frequency amplifier 2, and the amplified audio signal is modulated via the audio switch circuit 3. 4 is entered. The modulator 4 modulates, for example, the frequency (FM) of the high frequency signal supplied from the high frequency oscillation circuit 5 with the audio signal input thereto, and transmits the modulated signal via the power amplifier 6 to the transmission antenna 7. To supply. The signal supplied to the transmitting antenna 7 is converted into a radio wave here and emitted into the air.
[0043]
The high-frequency oscillation circuit 5 has the PLL synthesizer circuit configuration described above, and the oscillation frequency of the PLL synthesizer circuit 5 is controlled by a CPU (central processing unit) 8. That is, the CPU 8 has a memory (not shown). In this memory, the channel data corresponding to the frequencies of 30 channels allocated to the 800 MHz band wireless system are grouped into six groups GR1 to GR6, respectively, as shown in Table 1 below. It is stored in a divided state.
[0044]
[Table 1]

[0045]
Each frequency shown in Table 1 is defined by the "RCR-STD-15A" standard of the publicly known Association of Radio Industries and Businesses (ARIB). Each of the groups GR1 to GR6 is grouped for each of the frequencies that are not allocated to the above-described radio interference such as interference and intermodulation even if they are simultaneously used at the same place. Is.
[0046]
For example, group GR1 is assigned six frequencies of 806.125 MHz, 806.375 MHz, 807.125 MHz, 807.750 MHz, 809.000 MHz, and 809.500 MHz, and these frequencies are assigned to the same place. Even if they are used at the same time, they are not affected by the above interference or intermodulation. The same applies to each frequency allocated to the other groups GR2 to GR6. Each frequency is given a channel number in each group GR1 to GR6 and a channel name defined by the “RCR-STD-15A” standard.
[0047]
And the group selection part 9 for selecting any one of each group GR1 thru | or GR6 in the said Table 1 and the channel selection part 10 for selecting each channel in each group GR1 thru | or GR6 are provided. These are connected to the CPU 8. That is, the CPU 8 stores the channel data corresponding to the channel selected by the channel selection unit 10 among the channels allocated to the group obtained by the group selection unit 9 in the memory. Call from. Then, based on the called channel data, the PLL synthesizer circuit 5 is controlled so as to oscillate a signal having a corresponding frequency. As a result, the channel selected by the group selector 9 and the channel selector 10 is set as the communication channel of this transmitter.
[0048]
When the power switch 11 of the transmitter itself is switched from the ON state to the OFF state, the CPU 8 uses the channel data used for controlling the PLL synthesizer circuit 5 at that time, that is, used for communication at that time. It is also configured (programmed) to temporarily store channel data corresponding to a certain channel in the memory. However, when the transmitter is in an initial state, for example, in a factory-shipped state, channel data corresponding to a predetermined channel, for example, the channel CH1 of the group GR6 (that is, the B61 channel) is stored in the memory. Is in a state of being.
[0049]
Further, the CPU 8 includes a volume adjusting unit 12 for adjusting the volume on the receiver side, and an arbitrary two-digit identification number (hereinafter referred to as an identification code) for distinguishing this transmitter from transmitters of other systems. Is connected to a code setting unit 13 for setting. The volume adjustment unit 12 includes a volume up button 12a and a volume down button 12b. Then, the CPU 8 generates control data, which will be described later, according to the operations of the volume adjusting unit 12 and the code setting unit 13 and the group selecting unit 9 and the channel selecting unit 10, and this is generated via the modulator 4. To the receiver.
[0050]
Further, a tone signal generator 14 for generating a signal having a predetermined frequency, for example, a 32 kHz AC signal (hereinafter referred to as a tone signal) is provided on the input side of the modulator 4. The output of the tone signal generator 14 is also controlled by the CPU 8. Further, the CPU 8 controls the ON / OFF operation of the voice switch circuit 3 described above.
[0051]
Here, the external appearance of the transmitter is shown in FIG. As shown in FIG. 2A, the transmitter is a generally well-known hand-held type. In appearance, the transmitter has a round bar-like grip part 100 and a spherical receiver coupled to one end of the grip part 100. And a sound part 101. Among these, the above-described microphone 1 is built in the sound collection unit 101, and each component (in FIG. 1A) other than the microphone 1 is built in the grip unit 100. The cover 102 on the lower side of the grip part 100 (the side opposite to the head part 101) is detachable. By removing this cover 102, as shown in FIG. The unit 9, the channel selection unit 10, the code setting unit 13, and the volume adjustment unit 12 (the volume up button 12a and the volume down button 12b) can be arbitrarily operated. The power switch 11 is, for example, a slide type, and is provided slightly on the side of the grip portion 100 with only the knob portion exposed.
[0052]
As shown in FIG. 2 (b), the group selection unit 9 and the channel selection unit 10 are configured by generally known digital code output type switches. FIG. 4B shows a state where the channel having the group number “GR1” and the channel number “CH3”, that is, the “B13 channel” having a frequency of 807.125 MHz is selected.
[0053]
A code setting unit 13 is provided below the group selection unit 9 and the channel selection unit 10. The code setting unit 13 includes two switches 13a and 13b for setting the first digit (tenth digit) and the second digit (first digit) of the above-described code number separately. These switches 13a and 13b are also constituted by digital code output type switches, like the group selector 9 and the channel selector 10. FIG. 5B shows a state where “22” is set as the identification code by the switches 13a and 13b.
[0054]
A push button type volume up button 12 a and a volume down button 12 b constituting the volume setting unit 12 are provided below the code setting unit 13.
[0055]
By the way, in the transmitter configured as described above, the CPU 8 operates according to the flowchart shown in FIG. For example, it is assumed that the power supply (power switch 11) of the transmitter is in the “OFF” state.
[0056]
When the transmitter power supply (power switch 11) is turned on in this state, the CPU 8 first turns off the voice switch circuit 3 (step S2). As a result, the output (audio signal) of the microphone 1 is turned off.
[0057]
Next, the CPU 8 calls the channel data temporarily stored in the memory when the power switch 11 is turned off last time, that is, the channel data corresponding to the channel used for the previous communication from the memory. As described above, when the transmitter is in the initial state, channel data corresponding to “B13 channel” is called from the memory. Then, the channel corresponding to the called channel data (so-called storage channel) and the channel currently selected by the group selection unit 9 and the channel selection unit 10 (so-called selection channel) are collated, and these are the same. It is determined whether or not (step S4).
[0058]
If it is determined in step S4 that the storage channel and the selected channel are different, that is, a channel different from the channel used for the previous communication is selected as a new communication channel (in the case of NO), the CPU 8 performs the previous communication. Preparation for transmitting the above-described control data is started using the channel used for the above. The format of this control data is shown in FIG.
[0059]
As shown in the figure, the control data is obtained by serially connecting digital data of a bit synchronization unit 301, a frame synchronization unit 302, an identification code data unit 303, a control type flag 304, and a control data body unit 305, respectively. is there. Among these, the bit synchronization unit 301 and the frame synchronization unit 302 are used to synchronize with the receiver side when transmitting the control data. Then, data representing the identification code (for example, identification code “22” in the case of FIG. 2B) set by the code setting unit 13 is set in the identification code data unit 303 (step S6). . Then, the flag “1” is set in the control type flag 304, and the channel data of the channel obtained by the selection by the group selection unit 9 and the channel selection unit 10 is set in the control data body 305 (step S8). . The control type flag 304 indicates the type of data set in the control data body 305. When the flag “1” is set, the control data body 305 contains the channel data. Indicates that it is set.
[0060]
Based on the storage channel data, the channel used for the previous communication is set as a communication channel for transmitting the control data (step S10). In this state, by supplying power to the modulator 4, the power amplifier 6 and the like, the output (ie, RF power) of the transmitter is turned on (step S12), whereby the control data is directed to the receiver side. Transmit (step S14). Prior to step S12, the transmitter is not yet emitting radio waves.
[0061]
After transmitting the control data to the receiver, the CPU 8 turns off the output of the transmitter (step S16) and changes to the storage channel data and is selected by the current group selection unit 9 and channel selection unit 10. The data of the existing channel is temporarily stored in the memory (step S18). This time, preparation for transmitting the control data is started using the channel corresponding to the data newly stored in step S18, that is, the channel selected by the group selection unit 9 and the channel selection unit 10. .
[0062]
That is, data representing the identification code of the transmitter is set in the identification code data section 303 of the control data (step S20). Then, the flag “1” is set in the control type flag 304, and the newly stored channel data is set in the control data main body 305 (step S22). Based on the newly stored channel data, the channel selected by the group selection unit 9 and the channel selection unit 10 is set as a communication channel (step S24), and the output of the transmitter is turned on (step S24). In step S26, the control data is transmitted to the receiver side (step S28).
[0063]
After transmitting the control data, the output of the tone signal generator 14 described above is turned on to transmit a tone signal (step S30), and the voice switch 3 is turned on (step S32), so that wireless communication (ie, Audio signal transmission) is enabled (step S34).
[0064]
During the wireless communication, the CPU 8 always monitors the operation state of the volume adjusting unit 12 (step S36). When the volume adjustment unit 12 is operated (YES in step S36), the CPU 8 stops outputting the tone signal (step S38). Then, this time, volume adjustment data representing the operation content of the volume adjustment unit 12 is generated, set as control data, and ready to be transmitted to the receiver side through the channel currently used for communication. .
[0065]
That is, data representing the identification code of the transmitter is set in the identification code data section 303 of the control data (step S40). Next, “0” is set in the control type flag 304 (that is, the flag is lowered), and the volume adjustment data is set in the control data main body 305 (step S42). This control data is transmitted to the receiver side through the currently used channel (step S44). After the transmission of this control data, the transmission of the tone signal is resumed (step S46), and the process returns to the communicable state in step S34. When the control type flag 304 is set to “0”, it indicates that the volume adjustment data is set in the control data main body 305.
[0066]
When it is determined in step S4 that the storage channel matches the selected channel, that is, the channel used for the previous communication and the channel currently selected by the group selection unit 9 and the channel selection unit 10 are the same ( In the case of YES), the CPU 8 proceeds to step S20 at a stretch. That is, when wireless communication is performed using the same channel as the previous time, the CPU 8 omits steps S6 to S18, so wireless communication can be performed after the transmitter power is turned on. The so-called rise time can be shortened. In the present embodiment, it takes about 1 second for the CPU 8 to process each of the steps S6 to S18. Therefore, when wireless communication is performed using the same channel as the previous time, this approximately The time of 1 second can be shortened.
[0067]
On the other hand, the receiver is configured as follows with respect to the transmitter configured as described above. That is, the receiver is of a superheterodyne system, for example, and after receiving the radio wave transmitted from the transmitter by the receiving antenna 21, as shown in FIG. 1B, the received signal is amplified by the high frequency amplifier 22. It has a mixer 23 to which the received signal is inputted. The mixer 23 mixes the amplified reception signal inputted thereto with a local oscillation signal oscillated by the local oscillation circuit 24 to convert it into an intermediate frequency signal, which is converted by an intermediate frequency amplifier 25. After amplification, the signal is supplied to the detection circuit 26. The detection circuit 26 reproduces an audible frequency signal by performing FM detection on the intermediate frequency signal input thereto, and supplies this to a speaker 29 via a muting circuit (Attenuator) 27 and a low frequency amplifier 28. To do.
[0068]
The local oscillation circuit 24 has a PLL synthesizer circuit configuration similar to the high-frequency oscillation circuit 5 on the transmitter side, and the oscillation frequency of the PLL synthesizer circuit 24 is controlled by the CPU 30. However, the CPU 30 basically receives the control data described above from the transmitter side and is set in the control data main body 305 when the flag “1” is set in the control identification flag of the control data. The receiving channel is set by adjusting the oscillation frequency of the PLL synthesizer circuit 24 according to the channel data.
[0069]
In order to realize this, the receiver is provided with a tone removal filter 31 for removing the above-described tone signal included in the signal detected by the detection circuit 26 on the output side of the detection circuit 26. . The CPU 30 takes in the control data through the filter 31 and controls the PLL synthesizer circuit 24 according to the channel data included in the taken-in control data (control data main body 305).
[0070]
When the power switch 32 of the receiver itself is switched from the ON state to the OFF state, the CPU 30 uses the channel data used for controlling the PLL synthesizer circuit 24 at that time, that is, used for communication at that time. Channel data corresponding to a certain channel is also temporarily stored in a memory (not shown). However, when the receiver is in an initial state, for example, in a factory-shipped state, channel data corresponding to a predetermined channel, for example, the above-described B61 channel is stored in the memory.
[0071]
The CPU 30 is connected to a volume adjusting unit 33 for adjusting the volume of the receiver. The volume adjustment unit 33 includes a volume up button 33a and a volume down button 33b. When the buttons 33a and 33b are operated, the CPU 30 controls the amplification factor of the low frequency amplifier 28 in accordance with the operation. When the CPU 30 fetches control data through the filter 31 and “0” is set in the control identification flag of the control data, the CPU 30 responds to the volume adjustment data set in the control data main body 305. Thus, the adjustment of the amplification factor (ie, volume) of the low frequency amplifier 28 is also executed.
[0072]
On the receiver side, similarly to the transmitter, a code setting unit 34 for arbitrarily setting a two-digit identification code is provided in the receiver, and this is connected to the CPU 30. As will be described later, the CPU 30 identifies the identification code set by the code setting unit 34 and the identification code (set in the identification code data unit 303) included in the control data sent from the transmitter side. Only when they match, the receiving channel setting or volume adjustment according to the channel data or volume adjustment data included in the control data is executed.
[0073]
On the output side of the detection circuit 26 is provided a tone detection circuit 35 for further detecting the output of the detection circuit 26 and detecting the tone signal. The output of the tone detection circuit 35 is supplied to the CPU 30. is doing. Although not shown in FIG. 1B, the CPU 30 has a frequency of a tone signal sent from the transmitter side that forms a pair with this receiver (that is, configures the same system as this receiver). Tone data corresponding to. Then, the CPU 30 matches the frequency of the tone signal corresponding to the tone data with the frequency of the tone signal detected by the tone detection circuit 35 and obtains it by setting the code setting unit 34. The muting circuit 27 is controlled so that the output of the speaker 29 is valid only when the identification code matches the identification code included in the control data sent from the transmitter side.
[0074]
The CPU 30 is also supplied with an intermediate frequency signal amplified by the intermediate frequency amplifier 25. The CPU 30 controls the muting circuit 27 in accordance with the signal level of the intermediate frequency signal, that is, generally known. Configured to perform squelch operations.
[0075]
The external appearance of the receiver is shown in FIG. The receiver is, for example, a stationary flat rectangular parallelepiped, has a receiving antenna 21 on the back surface 200 side, and an operation panel provided with the volume adjusting unit 34, the code setting unit 35, etc. on the front surface 201 side. 202. FIG. 5B shows an enlarged view of the code setting unit 35 on the operation panel 202.
[0076]
As shown in FIG. 5B, the code setting unit 35 is similar to the code setting unit 13 on the transmitter side described above, for example, the first digit (10th digit) and the second digit (first digit) of the identification code. And two switches 35a and 35b for setting the numbers separately. These switches 35a and 35b are also of the same digital code output format as the switches 13a and 13b constituting the code setting unit 13 on the transmitter side. FIG. 5B shows a state where an identification code “22” is set by these switches 35a and 35b.
[0077]
In the receiver configured as described above, the CPU 22 operates according to the flowchart shown in FIG. The receiver has been in a state of performing wireless communication by a certain channel with the transmitter paired with the receiver, and at present, both the transmitter and the receiver are turned off. It is assumed that it is in a state. In addition, it is assumed that the same identification code is set (by the code setting units 13 and 34) in the transmitter and the receiver that are paired with each other.
[0078]
In this state, when the power supply (power switch 32) of the receiver is turned on, the CPU 30 first controls the muting circuit 50 so as to invalidate the output of the speaker 29 (that is, mute ON) (step S50).
[0079]
Then, the CPU 30 calls the channel data temporarily stored when the power was turned off last time, that is, the data of the channel used for the previous communication from the above-mentioned memory, and based on the called data, the receiving channel Is set (step S52). As a result, the receiver starts wireless communication (reception) using the channel used for the previous communication.
[0080]
When the power supply (power switch 11) on the transmitter side is turned on, the transmitter starts wireless communication (transmission) using the previously used channel as described above. That is, the transmitter first transmits the control data shown in FIG. 4 described above. At this time, the flag “1” is set in the control type flag 304 of the control data, and the control data main body 305 corresponds to the channel selected by the group selection unit 9 and the channel selection unit 10. Channel data is set.
[0081]
On the other hand, the receiver side monitors whether or not any radio wave has been received through the reception channel (step S54). If a radio wave is received (in the case of YES), it is confirmed whether or not control data has been received by the radio wave. If control data is received, it is included (set in the identification code data section 303). It is confirmed whether or not the identification code (which has been) matches the identification code on the receiver side (step S56). When the identification codes match (in the case of YES), it is confirmed whether or not the flag “1” is set in the control type flag 304 of the control data (step S58). In addition, in all these steps S54, S56, and S58, when all are NO, it returns to step S54.
[0082]
If the flag “1” is set in the control type flag 304 in the above step S58 (in the case of YES), the channel data set in the control data main body 305 of the control data corresponds to the current reception channel. It is confirmed whether it is the same as the channel data (step S60). When both are the same, that is, when wireless communication is performed using the same channel as the previous time (in the case of YES), the process proceeds to the next step S62. On the other hand, when the channel data are different (in the case of NO), the CPU 30 sets the reception channel corresponding to the channel data based on the channel data (set in the control data main body 305) included in the control data. The setting is reset (step S64). And it returns to step S54 and will be in the state which receives control data again.
[0083]
In step S62, it is confirmed whether or not a tone signal is transmitted from the transmitter side. If a tone signal is transmitted, the frequency is the frequency represented by the tone data of the receiver side. To see if it matches. Only when this confirmation is obtained, the muting circuit 27 is controlled to validate the output of step S29 (that is, to mute off), thereby enabling wireless communication with the transmitter (step S66). . In step S62, when the frequencies do not match (NO), CPU 30 determines that the control data has been sent from a transmitter of another system, and returns to step S54.
[0084]
The CPU 30 checks whether radio waves are always transmitted from the transmitter side during wireless communication (step S68) and whether the frequencies of the tone signals match (step S70). As long as these confirmations are obtained (in the case of YES), the wireless communication state is continued.
[0085]
Here, when changing the communication channel between the transmitter and the receiver, the transmitter is turned off after the desired channel is selected by the group selector 9 and the channel selector 10 on the transmitter side. As a result, the receiver does not receive radio waves from the transmitter side (NO in step S68), and the CPU 30 controls the muting circuit 27 so as to invalidate the output of the speaker 29 (step S72). Then, it is confirmed again whether or not radio waves are transmitted from the transmitter side (step S74). If not (NO), the process returns to step S54 to receive control data again. It will be in a state to fix. Here, when the power source on the transmitter side is turned on again, the CPU 30 on the receiver side repeats the procedure from the above step S54 and sets the reception channel corresponding to the control data (channel data) sent from the transmitter side. Set up.
[0086]
In addition, before turning off the power supply on the transmitter side, the desired channel is selected by the group selection unit 9 and the channel selection unit 10, but on the contrary, the power supply on the transmitter side is turned off, Even if a desired channel is selected with the power off, and then the power is turned on again, the same result as described above can be obtained.
[0087]
It is assumed that, for example, the volume adjustment unit 12 on the transmitter side is operated during the transmission / reception period during the connectionless communication. In this case, as described above, the transmission of the tone signal is temporarily stopped on the transmitter side. Then, “0” is set in the control type flag 304 of the control data, and the volume adjustment data corresponding to the operation state of the volume adjustment unit 12 is set in the control data main body unit 305, and this is transmitted to the receiver side. . After the transmission of this control data, it returns to the communicable state.
[0088]
On the other hand, at the receiver side, since the reception of the tone signal cannot be confirmed in step S70 (proceeding to NO), the output of the speaker 29 is invalidated by the muting 27 in step S72. In step S74, it is confirmed that at least only radio waves are emitted from the transmitter side (YES), and it is confirmed again whether a tone signal is transmitted (step S76). Here, CPU 30 cannot confirm the tone signal (NO in step S76), and thus proceeds to step S78. In this step S78, it is confirmed whether or not the control data has been sent, and if it has been sent, whether or not the identification code included in the control data matches the identification code on the receiver side, If the identification codes match (in the case of YES), the process proceeds to step S80, and it is confirmed whether or not the control type flag 304 of the control data is “0”. Only when these confirmations are obtained, actual volume adjustment is executed in accordance with the volume adjustment data included in the control data (step S82).
[0089]
After performing the volume adjustment in step S82, the CPU 30 returns to step S74. In step S74, it is confirmed that radio waves are emitted from the transmitter side (YES), and in the next step S76, transmission of tone signals from the transmitter side is resumed (YES). If it is confirmed, the process returns to step S66 to resume the wireless communication. If both of the above steps S78 and S80 are NO, the process returns to step S74.
[0090]
It is assumed that the radio wave emitted from the transmitter cannot be received on the receiver side due to the influence of fading or the like during the unrelated communication during the transmission / reception period. In this case, the CPU 30 proceeds to NO in step S68, and invalidates the output of the speaker 29 in step S72. However, in the next step S74, if it is confirmed again that the radio wave is emitted from the transmitter side (YES), and the tone signal is confirmed in step S76, the CPU 30 proceeds to step S66. Return to, and resume wireless communication.
[0091]
For example, when a combination of a transmitter and a receiver constituting a certain system is changed, channel data (corresponding to a channel used for the previous communication) temporarily stored in a memory on the transmitter side. And channel data (corresponding to the channel used for the previous communication) temporarily stored in the memory on the receiver side may be different. In such a case, even if the power of each transceiver is turned on in the state as it is, wireless communication between these transceivers cannot be realized. In order to cope with this, the receiver side has a reset switch (not shown), and the receiver can be returned to the factory shipment state by pressing the reset switch.
[0092]
That is, when the channel data temporarily stored in the transmitter and the receiver are different, the receiver is temporarily returned to the factory default state by the reset switch, and as a result, the above-mentioned B61 channel is set as the reception channel on the receiver side. Set. Also on the transmitter side, this B61 channel is set as the transmission channel (specifically, the B61 channel is selected by the group selection unit 9 and the channel selection unit 10, and then the power supply on the transmitter side is once turned ON → OFF. Wireless communication may be started through the B61 channel. Thereafter, when changing the communication channel, the same procedure as described above may be executed.
[0093]
For example, as shown in FIG. 7, two indicators 36 and 37 each consisting of a 7-segment LED are provided on the receiver side, and each of these indicators 36 and 37 is temporarily stored in the above memory on the receiver side. It may be configured to display existing channels (group number and channel number). In this way, even if the channel data temporarily stored on the transmitter side and the receiver side are different, the channel on the transmitter side is set in accordance with the channel displayed on the indicators 36 and 37. As a result, wireless communication between these transceivers becomes possible without returning the receiver side to the factory-shipped state.
[0094]
In consideration of the fact that the transmission / reception of the control data between the transceivers may not be performed well and the channel setting on the receiver side may not be performed normally, for example, as shown in FIG. In addition, for example, a push button group selection unit 38 and a channel selection unit 39 may be provided. In other words, a desired group can be selected by operating (pressing) the group selection unit 38, and the group number obtained by the selection is displayed on the display 36. A desired channel can be selected by operating (pressing) the channel selection unit 39, and the channel number obtained by the selection is displayed on the display 37.
[0095]
Means for selecting a group and channel according to the operation of each of the selection units 38 and 39, and means for controlling the display state of each of the indicators 36 and 37 according to the operation of each of the selection units 38 and 39, This is realized by the CPU 30. In this case, it is necessary to store the channel data for generating the channel frequency corresponding to the operation of each of the selection units 38 and 39 (that is, controlling the oscillation frequency of the PLL synthesizer circuit 24) in the above-described memory. is there. The reason why the push buttons are used as the selection units 38 and 39 is that the reception channel on the receiver side is changed by the control data (channel data) sent from the transmitter side. That is, the digital code output type switch employed in each of the selectors 9 and 10 on the transmitter side has a function as a switch and also has a function of displaying its non-operating state. Therefore, when such a switch is adopted in each of the selection units 38 and 39, the group number and channel number represented by each switch constituting each of the selection units 38 and 39, and the group of the reception channel actually set. This is because there may be a difference between the number and the channel number.
[0096]
As described above, according to the present embodiment, when a desired communication (transmission) channel is selected on the transmitter side, the reception channel on the receiver side is automatically switched accordingly. Therefore, it is possible to save the trouble of setting the channel on the receiver side. This is particularly effective when the channel setting statuses of the transmitter and the receiver cannot be directly confirmed with each other (by eyes or ears) due to a distance between the transmitter and the receiver.
[0097]
In addition, when both the transmitter and the receiver are turned off, the data of the channel used so far is stored. When the power is turned on again, wireless communication is started using the stored channel, that is, the channel used last time. Therefore, particularly when wireless communication is performed using the same channel as that used last time, the rise time of each transceiver can be shortened.
[0098]
On the transmitter side, a group selection unit 9 and a channel selection unit 10 are provided separately as means for selecting a communication channel. Therefore, when using a plurality of systems of the present embodiment at the same place at the same time, if different channels in the same group are selected on each transmitter side of each system, the above-mentioned system is used. It is possible to prevent the occurrence of radio interference such as modulation and intermodulation.
[0099]
Further, according to the flowchart shown in FIG. 3 described above, the CPU 8 on the transmitter side turns off the output (RF output) of the transmitter when the transmission channel is switched. Accordingly, the radio frequency interference is not caused to other systems due to the change with time of the transmission frequency that occurs when the transmission channel is switched.
[0100]
Furthermore, according to the present embodiment, not only channel setting on the receiver side but also volume adjustment can be controlled from the transmitter side. Therefore, this is particularly effective when the volume is adjusted by one person in the area where the system of this embodiment is used.
[0101]
Then, after confirming the combination of transmitters and receivers constituting the same system by collating the identification codes arbitrarily given to both the transmitter and the receiver, the above channel setting, volume adjustment, or muting by the muting circuit 27 Perform OFF control. Therefore, interference with other systems can be prevented, and the volume on the receiver side can be prevented from being changed unintentionally by the transmitters of other systems, thereby improving the reliability of communication.
[0102]
In this embodiment, the portion constituted by the transmitter-side modulator 4, the power amplifier 6 and the transmission antenna 7 corresponds to the transmission means described in the claims, and the memory of the transmitter-side CPU 8 has. Corresponds to the data storage means and the transmission channel storage means. The group selection unit 9 and the channel selection unit 10 correspond to the selection means described in the claims, and it is claimed that the group selection unit 9 and the channel selection unit 10 select a group and a channel, respectively. This corresponds to the group selection command and the individual channel selection command described in the range. Further, the power switch 11 on the transmitter side corresponds to the switching means described in the claims, the ON state of the power switch 11 corresponds to the first state, and the OFF state corresponds to the second state. To do. And CPU8 respond | corresponds to the transmission control means as described in a claim. Further, the code setting unit 13 on the transmitter side corresponds to the first, second and third transmitter side identification symbol setting means described in the claims, and is obtained by setting by the code setting unit 13 The identification code corresponds to the first, second and third transmitter side identification symbols. The volume adjustment data in the present embodiment corresponds to the command data described in the claims.
[0103]
Further, a part constituted by the receiving antenna 21 on the receiver side, the high frequency amplifier 22 and the mixer 23 (or a part including the intermediate frequency amplifier 25, the detection circuit 26, the low frequency amplifier 28 and the speaker 29) is patented. Corresponding to the receiving means described in the claims, the muting circuit 27 corresponds to the muting means. The CPU 30 on the receiver side corresponds to the reception control means and the muting control means, and the memory of the CPU 30 corresponds to the reception channel storage means described in the claims. Further, the code setting unit 34 on the receiver side corresponds to the first, second and third receiver side identification symbol setting means described in the claims, and is obtained by setting by the code setting unit 34 The identification code corresponds to the first, second and third receiver side identification symbols.
[0104]
In the present embodiment, the case where the present invention is applied to an 800 MHz band FM wireless microphone system has been described. However, the present invention is applied to other frequency bands, for example, 70 MHz band and 300 MHz band wireless systems. Also good. Although the FM wireless system has been described, the present invention may be applied to other modulation wireless systems such as AM (amplitude modulation). Furthermore, the present invention can be applied to a system for performing data communication other than voice, for example.
[0105]
In the present embodiment, an arbitrary identification code is set in both the transmitter and the receiver, and the identification code is collated to confirm the combination of the transceiver. If unnecessary, the code setting units 13 and 34 for setting the identification code need not be provided. However, the reliability of communication is improved when the combination of the transceivers is confirmed by the identification code as in the present embodiment.
[0106]
And, it was configured so that the volume adjustment on the receiver side can be realized from the transmitter side, but other functions such as the tone adjustment and squelch adjustment on the receiver side, or the external peripheral device that the receiver can connect to this is controlled. If an external control terminal is provided, the function of controlling the external peripheral device via the external control terminal may be configured to be remotely controlled from the transmitter side.
[0107]
Further, on the transmitter side, the power switch 11 is configured to correspond to the switching means described in the claims, but other than the power switch 11 is configured to correspond to the switching means. Also good.
[0108]
The transmitter-side CPU 8 is configured to operate according to the flowchart of FIG. 3 and the receiver-side CPU 30 is configured to operate according to the flowchart of FIG. 6, but the present invention is not limited thereto. In other words, the CPUs 8 and 30 may be controlled by procedures other than the flowcharts of FIGS. 3 and 6 as long as the same operations and effects as the present embodiment are achieved.
[0109]
Further, as shown in FIG. 5B, the code setting unit 34 on the receiver side is configured with two digital code output format switches 34a and 34b. However, the present invention is not limited to this. For example, as shown in FIG. 9, in place of the switches 34a and 34b, two push button switches 34c and 34d are provided, and a 7 segment LED for displaying a numerical value corresponding to each operation of the switches 34c and 34d. Two indicators 34e and 34f having a configuration may be provided.
[0110]
Furthermore, in this embodiment, a tone signal is used as one of the signals for controlling the muting circuit 27. Instead, an authorization number, that is, an ID number defined by the above-mentioned Japan Radio Industry Association is used. May be. Since this ID number is obliged to be transmitted from the transmitter side, strictly speaking, a step for transmitting this ID number must be provided in the flowchart shown in FIG. However, this ID number has no particular requirement that it must be processed on the receiver side, and is not directly related to the present embodiment, so the description thereof is omitted in this embodiment.
[0111]
【The invention's effect】
As described above, according to the transmitter of the first aspect of the present invention, the communication channel selection command for selecting the desired channel is given, and the switching means is changed from “first state” to “second state”. When “→ first state” is switched, the communication channels of both the transmitter and the receiver that is the communication partner are switched to the desired channel. Thus, if the channel setting is performed on the transmitter side, the channel on the receiver side is automatically set according to the channel setting, so that it is possible to save the trouble of setting the channel on the receiver side. This effect is particularly effective when the channel setting status in each of the transmitter and the receiver cannot be directly confirmed (by eyes or ears) due to a distance between the transmitter and the receiver.
[0112]
According to the transmitter of the second aspect of the present invention, the channels that can be used in the transmitter are grouped into those that are not affected by interference, intermodulation, etc. even if they are simultaneously used in the same area. ing. Therefore, when using multiple wireless systems with this transmitter at the same place at the same time, if each transmitter selects a different channel within the same group, the above-mentioned modulation and intermodulation between the systems, etc. This can prevent the occurrence of radio interference.
[0113]
According to the transmitter of the third aspect of the invention, when the communication channel is switched, the emission of radio waves is temporarily stopped. In other words, when the channel is switched, the frequency changes with time. If the radio wave is left emitted at this time, this radio wave may act as a jamming radio wave for other systems. is there. However, according to the third aspect of the present invention, since the emission of radio waves is temporarily stopped when the channel is switched as described above, there is an effect that radio interference with other systems can be prevented.
[0114]
In the transmitter according to the fourth aspect of the present invention, the switching means is also used as the power switch means. Therefore, there is no need to provide a switching means separately from the power switch means, and the number of parts can be reduced accordingly.
[0115]
According to the transmitter of the fifth aspect of the invention, various functions on the receiver side serving as a communication partner, for example, various adjustment functions such as volume adjustment, tone adjustment, squelch adjustment, etc. Functions and the like for controlling peripheral devices can be controlled by the transmitter according to the present invention. Accordingly, it is possible to solve the conventional problem that a single operator cannot realize a good volume adjustment, and to remotely control other functions on the receiver side.
[0116]
A wireless system according to a sixth aspect of the present invention comprises the transmitter according to the first aspect of the present invention, and a receiver capable of wireless communication with the transmitter. Therefore, the same effect as the invention according to the first, second, third, or fourth aspect can be obtained. Further, it is not necessary to provide a means for setting a channel uniquely on the receiver side, or a means for storing each channel data except for the predetermined channel described above. Therefore, there is an effect that the configuration of the receiver can be simplified accordingly.
[0117]
A wireless system according to a seventh aspect of the present invention comprises the transmitter according to the fifth aspect of the present invention and a receiver capable of wireless communication with the transmitter. Therefore, the same effect as that of the fifth aspect of the invention can be achieved. Further, as in the sixth aspect of the present invention, it is not necessary to provide means for setting a channel uniquely or means for storing each channel data except for a predetermined channel on the receiver side.
[0118]
A wireless system according to an eighth aspect of the present invention is the wireless system according to the seventh aspect, wherein identification symbols are assigned to both the transmitter and the receiver. Then, the identification numbers assigned to the transmitter and the receiver are collated, thereby confirming the combination of the transceivers that make up the same system, and then the transmitter controls various functions on the receiver side. Therefore, for example, even if a signal (that is, command data) for controlling a certain function is transmitted from a transmitter of another system to a receiver of a certain system, the signal of the certain receiver side is transmitted by the signal. There is an effect that the function can be prevented from being unintentionally controlled.
[0119]
According to the wireless system of the ninth aspect of the invention, the identification symbols given to both the transmitter and the receiver are collated to confirm the combination of the transceivers constituting the same system, and then the receiver itself The output is turned on, thereby enabling wireless communication between the transceivers for the first time. Therefore, for example, when there is no signal when the power supply on the transmitter side is OFF, it is possible to prevent interference with other systems, thereby improving the reliability of communication. This is very effective, for example, when a plurality of wireless systems are used simultaneously in substantially the same area.
[0120]
According to the wireless system of the invention described in claim 10, after checking the combination of the transmitters and receivers constituting the same system by checking the identification symbols given to both the transmitter and the receiver, Channel settings are made. Therefore, for example, even if a signal (that is, channel data) for changing the communication channel is transmitted from a transmitter of another system to a receiver of a certain system, the receiver of the certain system is transmitted by the signal. It is possible to prevent the receiving channel from being changed unintentionally.
[0121]
According to the wireless system of the eleventh aspect of the present invention, the receiver does not return to the initial state even when the power switch means is turned off, and is used until then when the power switch means is turned on again. Continue wireless communication using the channel that was being used. On the other hand, according to the invention described in claim 6, since the receiver returns to the initial state when the power of the receiver is turned off, when the power of the receiver is turned on again, It is necessary to perform wireless communication using the predetermined channel. Therefore, according to the second aspect of the present invention, it is possible to omit the wireless communication operation by the predetermined channel when the power supply of the receiver is once turned “OFF” → “ON”. It is possible to shorten the time until wireless communication is possible. This is particularly effective when the wireless communication is resumed using the same channel that was used last time (that is, before the receiver is turned off).
[Brief description of the drawings]
1A and 1B are diagrams showing an embodiment of the present invention, in which FIG. 1A is a schematic block diagram on a transmitter side, and FIG. 1B is a schematic block diagram on a receiver side;
2A and 2B are explanatory diagrams of a transmitter in the embodiment, in which FIG. 2A is an external view of the transmitter as viewed from the side, and FIG. 2B is a partially enlarged view of the inside of the transmitter.
FIG. 3 is a flowchart showing the operation of the CPU on the transmitter side in the embodiment.
FIG. 4 is a frame format of control data transmitted from the transmitter side to the receiver side in the embodiment.
5A and 5B are explanatory diagrams of the receiver in the embodiment, in which FIG. 5A is a schematic perspective view of the receiver, and FIG. 5B is a partially enlarged view of an operation panel.
FIG. 6 is a flowchart showing the operation of the CPU on the receiver side in the embodiment.
FIG. 7 is a diagram showing an example of improvement on the receiver side in the embodiment, and is a partially enlarged view of the operation panel.
FIG. 8 is a diagram showing an improved example different from FIG.
FIG. 9 is a diagram showing another example of FIG. 5 (b).
[Explanation of symbols]
1 Microphone
4 Modulator
5, 24 PLL synthesizer circuit
7 Transmitting antenna
8, 30 Central processing unit (CPU)
9 Group selection section
10 Channel selector
12 Volume setting section
21 Receiving antenna
23 Mixer

Claims (11)

A transmission means for performing wireless communication through a set channel;
Data storage means for storing a plurality of channel data respectively corresponding to channels that can be set in the transmission means;
Selection means for selecting any of the channel data stored in the data storage means in accordance with a communication channel selection command given from the outside;
Switching means capable of arbitrarily switching between the first state and the second state;
Transmission channel storage means for storing channel data corresponding to the channel set in the transmission means at that time when the switching means switches from the first state to the second state;
When the switching means switches from the second state to the first state, the channel data currently stored in the transmission channel storage means and the channel data selected by the selection means are the same. When the channel corresponding to the channel data stored in the transmission channel storage means is set in the transmission means and the channel data is transmitted, wireless communication is possible using the set channel, and the switching means is When the channel data stored in the transmission channel storage means at that time and the channel data selected by the selection means are different when switching from the second state to the first state, the transmission channel storage means The channel corresponding to the channel data stored in After the channel data selected by the selection means is transmitted, the channel corresponding to the channel data selected by the selection means is set in the transmission means and set. Transmission control means for controlling the transmission means in a state enabling wireless communication by channel;
A transmitter comprising:
A receiving means for selecting and receiving a signal of a set channel, and a predetermined channel is set in the receiving means only in an initial state, and thereafter, channel data sent from the transmitter side by the receiving means. A wireless transmitter capable of wireless communication with a wireless receiver comprising: a reception control means for setting a channel corresponding to the channel data obtained by receiving the received data in the receiving means. The data storage means stores each channel data in a grouped state corresponding to channels that can be simultaneously used in substantially the same area when performing wireless communication,
The communication channel selection command consists of a group selection command and an individual channel selection command,
The said selection means is comprised in the state which selects the channel data corresponding to the said individual channel selection command in the group corresponding to the said group selection command among each grouped channel data. Wireless transmitter. 3. The wireless transmitter according to claim 1, wherein when the transmission control unit changes a channel set in the transmission unit, the wireless communication by the transmission unit is temporarily stopped. 4. The switching means is transmitter-side power switch means for turning ON / OFF the power of the wireless transmitter itself, and the ON state of the transmitter-side power switch means is the first state, and the transmitter The wireless transmitter according to claim 1, 2 or 3, wherein the OFF state of the side power switch means is the second state. 5. The wireless transmitter according to claim 1, further comprising command input means for inputting a command for controlling a predetermined function on the wireless receiver side, wherein the transmission control means includes the command input. When the instruction is input from the means, the instruction data representing the contents is configured to be transmitted by the transmission means,
A wireless transmitter comprising function control means for controlling the predetermined function of the receiver according to the command data obtained by receiving the command data when the wireless receiver receives the command data by the receiving means. A wireless transmitter according to claim 1, 2, 3 or 4 and a wireless receiver,
The wireless receiver selects and receives a signal of the set channel, and sets a predetermined channel in the receiving means only in the initial state. A wireless system comprising: reception control means for setting, in the receiving means, a channel corresponding to channel data obtained by receiving the received channel data. A wireless transmitter according to claim 5 and a wireless receiver,
The wireless receiver selects and receives a signal of the set channel, and sets a predetermined channel in the receiving means only in the initial state. Thereafter, the receiving means is connected from the transmitter side. The receiving control means for setting the channel corresponding to the received channel data in the receiving means when receiving the channel data sent, and the reception when the command data is received by the receiving means. And a function control means for controlling the predetermined function of the wireless receiver according to the command data obtained. The wireless transmitter includes first transmitter-side identification symbol setting means for setting an arbitrary first transmitter-side identification symbol in the wireless transmitter, and the transmission control means causes the transmission means to transmit the command data. At the same time, the first identification data representing the first transmitter-side identification symbol is also transmitted,
The wireless receiver includes first receiver-side identification symbol setting means for setting an arbitrary first receiver-side identification symbol in the wireless receiver, and the reception control means receives the command data by the receiving means. The command obtained by receiving only when the first transmitter-side identification symbol represented by the first identification data sent simultaneously with the first receiver-side identification symbol matches. The wireless system according to claim 7, wherein the wireless communication system is configured to control the predetermined function of the wireless receiver by the function control means according to data. The wireless transmitter includes second transmitter-side identification symbol setting means for setting an arbitrary second transmitter-side identification symbol in the wireless transmitter, and the transmission control means causes the transmission means to transmit the channel data. At the same time, the second identification data representing the second transmitter side identification symbol is also transmitted,
The wireless receiver turns ON / OFF the second receiver side identification symbol setting means for setting an arbitrary second receiver side identification symbol on the wireless receiver according to the muting control signal. The muting means and the receiving means receive the channel data, and the second transmitter side identification symbol and the second receiver side identification symbol represented by the second identification data sent simultaneously with the channel data. The wireless system according to claim 6, 7 or 8, further comprising: muting control means for generating the muting control signal in a state in which the output of the wireless receiver itself is turned on only when the two coincide with each other. The wireless transmitter includes third transmitter-side identification symbol setting means for setting an arbitrary third transmitter-side identification symbol in the wireless transmitter, and the transmission control means causes the transmission means to transmit the channel data. At the same time, the third identification data representing the third transmitter side identification symbol is also transmitted,
The wireless receiver includes third receiver-side identification symbol setting means for setting an arbitrary third receiver-side identification symbol in the wireless receiver, and the reception control means receives the channel data by the receiving means. The channel data obtained by the reception only when the third transmitter side identification symbol and the third receiver side identification symbol represented by the third identification data sent simultaneously with the third identification data coincide with each other. 10. The wireless system according to claim 6, 7, 8 or 9, wherein a channel corresponding to is configured to be set in the receiving means. The wireless receiver is set to the receiver means at the time when the receiver power switch means for turning on / off its own power supply and the receiver power switch means switches from the ON state to the OFF state. Receiving channel storage means for storing channel data corresponding to a certain channel, and the reception control means is stored in the reception channel storage means when the receiver-side power switch means is switched from the OFF state to the ON state. The wireless system according to claim 6, 7, 8, 9 or 10, wherein the channel corresponding to the channel data is set in the receiving means.

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