JPS63169571A - Tone detector - Google Patents
Tone detectorInfo
- 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
Abstract
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。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tone detection device that detects a tone signal that repeats the same waveform at a constant cycle. In particular, it relates to a period counting type tone detection device.
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。The present invention is a tone detection device that detects a tone signal that repeats the same waveform at a certain period, and which counts a reference clock signal over n periods of an input tone signal, and sets a pre-stored frequency according to an address corresponding to the counted value. By reading the detection signal related to the tone signal from the memory, the circuit does not become complicated even if there are many types of frequencies of the tone signal to be detected.
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。Conventional tone detection devices determine the frequency range of the tone signal to be detected and compare it with a predetermined setting value using a comparator for each range. I needed it.
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。However, such conventional tone detection devices require a comparator for each frequency of the tone signal to be detected.
The disadvantage is that the circuit becomes complicated when there are many types of tone signal frequencies to be detected.
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。The present invention solves the above-mentioned drawbacks, and aims to provide a tone detection device whose circuit does not become complicated even when there are many types of frequencies of tone signals to be detected.
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。The present invention includes a level determiner for determining whether the level of an input tone signal is equal to or higher than a preset reference level, and means for detecting the frequency of the tone signal based on the determination result of the level determiner. In the tone detection device, the detecting means is configured to detect n of the tone signal.
an n-cycle extraction circuit that extracts a period (n is a predetermined integer of 1 or more); a reference clock generation circuit that generates a reference clock signal; and a reference clock generation circuit that generates a reference clock signal;
It is characterized by comprising a counting circuit that counts this reference clock signal while it is being output by the period extraction circuit, and a memory that outputs a detection signal related to a pre-stored frequency from an address corresponding to the count value of this counting circuit. shall be.
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。n periods of the tone signal input to the n period switching circuit (n is 1
A signal at the rHJ level is output over the above predetermined integer. The counting circuit counts the reference clock signal of the reference clock generation circuit over the n periods when the input tone signal is higher than a predetermined reference level. Data of the detected frequency is stored in advance in the read-only memory at an address corresponding to this count value. Read this from read-only memory.
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。With the above operation, even if there are many types of tone signal frequencies to be detected, the circuit does not become complicated.
本発明の実施例について図面を参照して説明する。 Embodiments of the present invention will be described with reference to the drawings.
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。The figure is a block diagram of a tone detection device according to an embodiment of the present invention. In the figure, the tone detection device has an input terminal 1 to which a tone signal a is input, and an n-period cutout device which inputs the tone signal a from the input terminal 1 and outputs a gate signal S at rHJ level for n periods of the tone signal a. a circuit 2, a reference level generator 4 that generates a reference level signal C, and a reference level signal C.
and a level determiner 3 which inputs the tone signal a, determines the level of the tone signal a, and outputs a reset signal d when the tone signal a is below the reference level signal C.
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
。The tone detection device also includes a reference clock generator 5 that generates a reference clock signal e, an AND gate that inputs a gate signal S and a reference clock signal e, and outputs an amount counting clock signal f of n periods of the tone signal a. 6, a counting circuit 7 which inputs a reset signal d and a counting clock signal f, counts n cycles of a tone signal a, and outputs a count value signal g; It includes a read-only memory (ROM) 8 that outputs a detection signal related to a frequency previously stored in a corresponding address, and an output terminal 9 that outputs the detection signal to a circuit not shown.
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。In FIG. 0, which describes the operation of the tone detection device having such a configuration, a tone signal a having a frequency of 1 (Hz) is input from an input terminal 1. In FIG. The tone signal a is compared with the reference level signal C output from the reference level generator 4 in the level determiner 3, and if the level of the tone signal a is equal to or higher than the reference level, the reset signal d is canceled. The counting circuit 7 becomes ready for counting. Simultaneously n period cutting circuit 2
detects n periods of tone signal a, and sets gate signal S to rHJ level only during n periods. The reference clock signal e with a frequency j (Hz) is output from the reference clock generator 5, and the AND gate 6 performs a logical product of the reference clock signal e and the gate signal S, and gates the reference clock signal e. and output as a counting clock signal f. The time the gate signal reaches rHJ level is n/
t (see), so the number of pulses of the counting clock signal f is n/i÷1/j=n-j/i.
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。Therefore, since the counting clock signal f is counted by the counting circuit 7, the value of the counting value signal g becomes n·j/i.
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。Since the count value signal g becomes the address input of the successive memory 8, the address n −j / i of the successive memory 8 is
Set the data in advance. As a result, when tone signal a of frequency 1 (Hz) is input, data at address n-j/i is read out and a detection signal is output.
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。The detection signal is output from the output terminal 9 to a circuit not shown, indicating that a tone signal has been detected. Therefore frequency 1
)+1! The detection of a plurality of tones of +13+-.- is performed at the address n''j/it of the successive memory 8.
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。This is possible by setting the data n-j/it*n-j/is, -. This data may be displayed as a number of frequencies, as a number of H2, or as information representing the meaning of each frequency.
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。As explained above, the present invention does not make the circuit complicated even when there are many types of tone signal frequencies to be detected, and can be easily detected by simply changing the data in the read-only memory (ROM). It has the excellent effect of making the frequency variable.
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。The figure is a block diagram of a tone detection device according to an embodiment of the present invention. 1... Input terminal, 2... n period cutting circuit, 3...
Level judger, 4... Reference level generator, 5... Reference clock generator, 6... AND gate, 7... Counting circuit, 8... Continuation dedicated memory, 9... Output terminal,
a...Tone signal, b...Gate signal, C...Reference level signal, d...Reset signal, e...Reference clock signal, f...Counting clock signal, g...Meter Numerical signal, h...detection signal.
Claims (1)
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。(1) A level determiner for determining whether the level of an input tone signal is equal to or higher than a preset reference level, and means for detecting the frequency of the tone signal based on the determination result of the level determiner. In the tone detection device, the detecting means includes an n-cycle extraction circuit (2) that extracts n periods (n is a predetermined integer of 1 or more) of the tone signal, and a reference clock that generates a reference clock signal. Generation circuit (5
), and a counting circuit (6, 7) that counts the reference clock signal while the n-cycle extraction circuit outputs it based on the determination result.
and a memory that outputs a detection signal related to a pre-stored frequency from an address corresponding to the count value of the counting circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP79887A JPS63169571A (en) | 1987-01-06 | 1987-01-06 | Tone detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP79887A JPS63169571A (en) | 1987-01-06 | 1987-01-06 | Tone detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS63169571A true JPS63169571A (en) | 1988-07-13 |
Family
ID=11483700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP79887A Pending JPS63169571A (en) | 1987-01-06 | 1987-01-06 | Tone detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS63169571A (en) |
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