JPS63169571A - ト−ン検出装置 - Google Patents
ト−ン検出装置Info
- Publication number
- JPS63169571A JPS63169571A JP79887A JP79887A JPS63169571A JP S63169571 A JPS63169571 A JP S63169571A JP 79887 A JP79887 A JP 79887A JP 79887 A JP79887 A JP 79887A JP S63169571 A JPS63169571 A JP S63169571A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- tone
- circuit
- level
- reference clock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 238000000605 extraction Methods 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
め要約のデータは記録されません。
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、一定の周期で同じ波形を繰り返すトーン信号
を検出するトーン検出装置に関する。特に、周期計数型
のトーン検出装置に関する。
を検出するトーン検出装置に関する。特に、周期計数型
のトーン検出装置に関する。
本発明は一定の周期で同じ波形を繰り返すトーン信号を
検出するトーン検出装置において、入力するトーン信号
のｎ周期にわたり基準クロック信号を計数し、この計数
値に対応するアドレスに従ってあらかじめ格納されてあ
る周波数に関する検出信号をメモリから読み出すことに
より、検出するトーン信号の周波数の種類が多くても回
路が複雑にならないようにしたものである。
検出するトーン検出装置において、入力するトーン信号
のｎ周期にわたり基準クロック信号を計数し、この計数
値に対応するアドレスに従ってあらかじめ格納されてあ
る周波数に関する検出信号をメモリから読み出すことに
より、検出するトーン信号の周波数の種類が多くても回
路が複雑にならないようにしたものである。
従来トーン検出装置は、検出するトーン信号の周波数の
範囲を定め、その範囲ごとに比較器により所定の設定値
と比較して決定しているために、検出するトーン信号の
周波数ごとに比較器を必要としていた。
範囲を定め、その範囲ごとに比較器により所定の設定値
と比較して決定しているために、検出するトーン信号の
周波数ごとに比較器を必要としていた。
しかし、このような従来のトーン検出装置では、検出す
るトーン信号の周波数ごとに比較器を必要とするので、
検出するトーン信号の周波数の種類が多い場合に、回路
が複雑になる欠点があった。
るトーン信号の周波数ごとに比較器を必要とするので、
検出するトーン信号の周波数の種類が多い場合に、回路
が複雑になる欠点があった。
本発明は上記の欠点を解決するもので、検出するトーン
信号の周波数の種類が多くても回路が複雑にならないト
ーン検出装置を提供することを目的とする。
信号の周波数の種類が多くても回路が複雑にならないト
ーン検出装置を提供することを目的とする。
本発明は、入力するトーン信号のレベルがあらかじめ設
定された基準レベル以上であるかを判定するレベル判定
器と、このレベル判定器の判定結果に基づいて上記トー
ン信号の周波数を検出する手段とを備えたトーン検出装
置において、上記検出する手段は、上記トーン信号のｎ
周期（ｎは１以上のあらかじめ定めてある整数）を切り
出すｎ周期切出回路と、基準クロック信号を発生する基
準クロック発生回路と、上記判定結果に基づいて上記ｎ
周期切出回路の出力する間この基準クロック信号を計数
する計数回路と、この計数回路の計数値に対応するアド
レスからあらかじめ格納されてある周波数に関する検出
信号を出力するメモリとを備えたことを特徴とする。
定された基準レベル以上であるかを判定するレベル判定
器と、このレベル判定器の判定結果に基づいて上記トー
ン信号の周波数を検出する手段とを備えたトーン検出装
置において、上記検出する手段は、上記トーン信号のｎ
周期（ｎは１以上のあらかじめ定めてある整数）を切り
出すｎ周期切出回路と、基準クロック信号を発生する基
準クロック発生回路と、上記判定結果に基づいて上記ｎ
周期切出回路の出力する間この基準クロック信号を計数
する計数回路と、この計数回路の計数値に対応するアド
レスからあらかじめ格納されてある周波数に関する検出
信号を出力するメモリとを備えたことを特徴とする。
ｎ周期切換回路で入力するトーン信号のｎ周期（ｎは１
以上のあらかじめ定めてある整数）にわたりｒＨＪレベ
ルの信号を出力する。計数回路では入力するトーン信号
があらかじめ定められた基準レベル以上であるとき、基
準クロック発生回路の基準クロック信号を上記ｎ周期に
わたり計数する。続出専用メモリには、この計数値に対
応するアドレスにあらかじめ検出周波数のデータが格納
しである。これを読出専用メモリから読み出す。
以上のあらかじめ定めてある整数）にわたりｒＨＪレベ
ルの信号を出力する。計数回路では入力するトーン信号
があらかじめ定められた基準レベル以上であるとき、基
準クロック発生回路の基準クロック信号を上記ｎ周期に
わたり計数する。続出専用メモリには、この計数値に対
応するアドレスにあらかじめ検出周波数のデータが格納
しである。これを読出専用メモリから読み出す。
以上の動作により検出するトーン信号の周波数の種類が
多くても回路が複雑にならない。
多くても回路が複雑にならない。
本発明の実施例について図面を参照して説明する。
図は本発明一実施例トーン検出装置のブロック構成図で
ある。図において、トーン検出装置は、トーン信号ａが
入力する入力端子ｌと、入力端子１からトーン信号ａを
入力しトーン信号ａのｎ周期の間ｒＨＪレベルのゲート
信号すを出力するｎ周期切出回路２と、基準レベル信号
Ｃを発生する基準レベル発生器４と、基準レベル信号Ｃ
およびトーン信号ａを入力しトーン信号ａのレベルを判
定しトーン信号ａが基準レベル信号Ｃ以下であるときリ
セット信号ｄを出力するレベル判定器３とを備える。
ある。図において、トーン検出装置は、トーン信号ａが
入力する入力端子ｌと、入力端子１からトーン信号ａを
入力しトーン信号ａのｎ周期の間ｒＨＪレベルのゲート
信号すを出力するｎ周期切出回路２と、基準レベル信号
Ｃを発生する基準レベル発生器４と、基準レベル信号Ｃ
およびトーン信号ａを入力しトーン信号ａのレベルを判
定しトーン信号ａが基準レベル信号Ｃ以下であるときリ
セット信号ｄを出力するレベル判定器３とを備える。
また、トーン検出装置は、基準クロック信号ｅを発生す
る基準クロック発生器５と、ゲート信号すおよび基準ク
ロック信号ｅを入力し、トーン信号ａのｎ周期の量計数
クロック信号ｆを出力するアンドゲート６と、リセット
信号ｄおよび計数クロック信号ｆを入力し、トーン信号
ａのｎ周期を計数し、計数値信号ｇを出力する計数回路
７と、計数値信号ｇを入力し、計数値信号ｇの対応する
アドレスにあらかじめ格納されてある周波数に関する検
出信号りを出力する続出専用記憶器（ＲＯＭ）８と、検
出信号りを図外の回路に出力する出力端子９とを備える
。
る基準クロック発生器５と、ゲート信号すおよび基準ク
ロック信号ｅを入力し、トーン信号ａのｎ周期の量計数
クロック信号ｆを出力するアンドゲート６と、リセット
信号ｄおよび計数クロック信号ｆを入力し、トーン信号
ａのｎ周期を計数し、計数値信号ｇを出力する計数回路
７と、計数値信号ｇを入力し、計数値信号ｇの対応する
アドレスにあらかじめ格納されてある周波数に関する検
出信号りを出力する続出専用記憶器（ＲＯＭ）８と、検
出信号りを図外の回路に出力する出力端子９とを備える
。
このような構成のトーン検出装置の動作について説明す
る０図において、入力端子１から周波数１（Ｈｚ）のト
ーン信号ａが入力される。トーン信号ａはレベル判定器
３にて、基準レベル発生器４から出力される基準レベル
信号Ｃと比較され、トーン信号ａのレベルが基準レベル
以上である場合には、リセット信号ｄが解除され、計数
回路７が計数可能状態になる。同時にｎ周期切出回路２
はトーン信号ａのｎ周期の期間を検出し、ｎ周期のみゲ
ート信号すをｒＨＪレベルにする。基準クロック発生器
５からは周波数ｊ（Ｈｚ）の基準クロック信号ｅが出力
され、アンドゲート６により、基準クロック信号ｅとゲ
ート信号すとの論理積がとられ、基準クロック信号ｅに
ゲートがかけられ計数クロック信号ｆとして出力される
。ゲート信号すがｒＨＪレベルになる時間は、ｎ ／
ｔ （ｓｅｅ）なので計数クロック信号ｆのパルス数
は、ｎ／ｉ÷１／ｊ＝ｎ−ｊ／ｉ となる。
る０図において、入力端子１から周波数１（Ｈｚ）のト
ーン信号ａが入力される。トーン信号ａはレベル判定器
３にて、基準レベル発生器４から出力される基準レベル
信号Ｃと比較され、トーン信号ａのレベルが基準レベル
以上である場合には、リセット信号ｄが解除され、計数
回路７が計数可能状態になる。同時にｎ周期切出回路２
はトーン信号ａのｎ周期の期間を検出し、ｎ周期のみゲ
ート信号すをｒＨＪレベルにする。基準クロック発生器
５からは周波数ｊ（Ｈｚ）の基準クロック信号ｅが出力
され、アンドゲート６により、基準クロック信号ｅとゲ
ート信号すとの論理積がとられ、基準クロック信号ｅに
ゲートがかけられ計数クロック信号ｆとして出力される
。ゲート信号すがｒＨＪレベルになる時間は、ｎ ／
ｔ （ｓｅｅ）なので計数クロック信号ｆのパルス数
は、ｎ／ｉ÷１／ｊ＝ｎ−ｊ／ｉ となる。
したがって、計数クロック信号ｆは計数回路７でカウン
トされるため、計数値信号ｇの値はｎ・ｊ／ｉとなる。
トされるため、計数値信号ｇの値はｎ・ｊ／ｉとなる。
計数値信号ｇは続出専用記憶器８のアドレス入力となる
ために、続出専用記憶器８のアドレスｎ −ｊ ／ ｉ
にあらかじめデータをセットしておく。これにより、周
波数１（Ｈｚ）のトーン信号ａが入力された場合にアド
レスｎ−ｊ／ｉのデータが読み出され検出信号りが出力
される。
ために、続出専用記憶器８のアドレスｎ −ｊ ／ ｉ
にあらかじめデータをセットしておく。これにより、周
波数１（Ｈｚ）のトーン信号ａが入力された場合にアド
レスｎ−ｊ／ｉのデータが読み出され検出信号りが出力
される。
検出信号りは出力端子９から図外の回路へ出力され、ト
ーン信号が検出されたことを示す。したがって周波数１
）＋ １！＋ １３＋ −・−の複数のトーン検出
は、続出専用記憶器８のアドレスｎ”ｊ／ｉｔ。
ーン信号が検出されたことを示す。したがって周波数１
）＋ １！＋ １３＋ −・−の複数のトーン検出
は、続出専用記憶器８のアドレスｎ”ｊ／ｉｔ。
ｎ−ｊ／ｉｔ ＊ ｎ−ｊ／ｉｓ 、−・−のデータ
をセットしておけば可能である。このデータは、何番目
の周波数との表示でもよいし、何Ｈ２との表示でもよい
し、周波数ごとの意味を表す情報でもよい。
をセットしておけば可能である。このデータは、何番目
の周波数との表示でもよいし、何Ｈ２との表示でもよい
し、周波数ごとの意味を表す情報でもよい。
以上説明したように、本発明は、検出すべきトーン信号
の周波数の種類が多い場合にも回路が複雑にならず、ま
た、続出専用記憶器（ＲＯＭ）のデータを変更するだけ
で容易に検出周波数を可変にできる優れた効果がある。
の周波数の種類が多い場合にも回路が複雑にならず、ま
た、続出専用記憶器（ＲＯＭ）のデータを変更するだけ
で容易に検出周波数を可変にできる優れた効果がある。
図は本発明一実施例トーン検出装置のブロック構成図で
ある。 １・・・入力端子、２・・・ｎ周期切出回路、３・・・
レベル判定器、４・・・基準レベル発生器、５・・・基
準クロック発生器、６・・・アンドゲート、７・・・計
数回路、８・・・続出専用記憶器、９・・・出力端子、
ａ・・・トーン信号、ｂ・・・ゲート信号、Ｃ・・・基
準レベル信号、ｄ・・・リセット信号、ｅ・・・基準ク
ロック信号、ｆ・・・計数クロック信号、ｇ・・・計数
値信号、ｈ・・・検出信号。
ある。 １・・・入力端子、２・・・ｎ周期切出回路、３・・・
レベル判定器、４・・・基準レベル発生器、５・・・基
準クロック発生器、６・・・アンドゲート、７・・・計
数回路、８・・・続出専用記憶器、９・・・出力端子、
ａ・・・トーン信号、ｂ・・・ゲート信号、Ｃ・・・基
準レベル信号、ｄ・・・リセット信号、ｅ・・・基準ク
ロック信号、ｆ・・・計数クロック信号、ｇ・・・計数
値信号、ｈ・・・検出信号。
Claims (1)
- （１）入力するトーン信号のレベルがあらかじめ設定さ
れた基準レベル以上であるかを判定するレベル判定器と
、 このレベル判定器の判定結果に基づいて上記トーン信号
の周波数を検出する手段と を備えたトーン検出装置において、 上記検出する手段は、 上記トーン信号のｎ周期（ｎは１以上のあらかじめ定め
てある整数）を切り出すｎ周期切出回路（２）と、 基準クロック信号を発生する基準クロック発生回路（５
）と、 上記判定結果に基づいて上記ｎ周期切出回路の出力する
間この基準クロック信号を計数する計数回路（６、７）
と、 この計数回路の計数値に対応するアドレスからあらかじ
め格納されてある周波数に関する検出信号を出力するメ
モリと を備えたことを特徴とするトーン検出装置。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP79887A JPS63169571A (ja) | 1987-01-06 | 1987-01-06 | ト−ン検出装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP79887A JPS63169571A (ja) | 1987-01-06 | 1987-01-06 | ト−ン検出装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63169571A true JPS63169571A (ja) | 1988-07-13 |
Family
ID=11483700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP79887A Pending JPS63169571A (ja) | 1987-01-06 | 1987-01-06 | ト−ン検出装置 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63169571A (ja) |
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