JPH0249221U - - Google Patents
Info
- Publication number
- JPH0249221U JPH0249221U JP12711888U JP12711888U JPH0249221U JP H0249221 U JPH0249221 U JP H0249221U JP 12711888 U JP12711888 U JP 12711888U JP 12711888 U JP12711888 U JP 12711888U JP H0249221 U JPH0249221 U JP H0249221U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- integrating circuit
- determines
- bandpass filter
- resistance value
- 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 description 3
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Networks Using Active Elements (AREA)
Description
第１図は本考案のトーン信号検出回路の一実施
例を示したブロツク図である。
１…バンドパスフイルタ、２…検波器、１１，
１２，１３…オペアンプ、１４，１５，１６，１
７…可変抵抗。
FIG. 1 is a block diagram showing an embodiment of the tone signal detection circuit of the present invention. 1... Bandpass filter, 2... Detector, 11,
12, 13... operational amplifier, 14, 15, 16, 1
7...Variable resistance.
Claims (1)
ータ回路をカスケード状に接続し、このインバー
タ回路の出力信号を前記積分回路の入力段にフイ
ードバツクして成るバイカツト回路によつて形成
される帯域フイルタ手段と、この帯域フイルタ手
段の前記積分回路の出力信号を検波する検波手段
とを具備し、且つ、前記積分回路の入力段にある
入力抵抗、積分回路の積分特性を決定する抵抗値
又はコンデンサの容量値及び前記フイードバツク
量を決定する抵抗値の全部又は一部を個別に可変
して設定するパラメータ設定手段を具備したこと
を特徴とするトーン信号検出回路。 A bandpass filter means formed by a bi-cut circuit in which an inverter circuit is connected in cascade after an integrating circuit that inputs a tone signal, and the output signal of the inverter circuit is fed back to the input stage of the integrating circuit; detection means for detecting the output signal of the integrating circuit of the bandpass filter means, and an input resistor at the input stage of the integrating circuit, a resistance value or a capacitance value of a capacitor that determines the integral characteristic of the integrating circuit, and A tone signal detection circuit comprising parameter setting means for individually varying and setting all or part of the resistance value that determines the amount of feedback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12711888U JPH0249221U (en) | 1988-09-30 | 1988-09-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12711888U JPH0249221U (en) | 1988-09-30 | 1988-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0249221U true JPH0249221U (en) | 1990-04-05 |
Family
ID=31379252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12711888U Pending JPH0249221U (en) | 1988-09-30 | 1988-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249221U (en) |
-
1988
- 1988-09-30 JP JP12711888U patent/JPH0249221U/ja active Pending