JPS5991061U - Tone detection circuit - Google Patents
Tone detection circuitInfo
- Publication number
- JPS5991061U JPS5991061U JP18832082U JP18832082U JPS5991061U JP S5991061 U JPS5991061 U JP S5991061U JP 18832082 U JP18832082 U JP 18832082U JP 18832082 U JP18832082 U JP 18832082U JP S5991061 U JPS5991061 U JP S5991061U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- tone
- tone detection
- counter
- signal
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (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。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案によるトーン検出回路の一実施例を示す
ブロック図である。第２図は第１図のトーン検出回路の
動作を示すタイミングチャートの一例を示す図である。
１・・・情報伝送用電気信号の入力端子、２・・・クロ
ック信号の入力端子、３・・・トーン検出信号の出力端
子、１１・・・１〜−ンフィルタ、１２・・・スレシュ
ボールド検出器、１３・・・スレシュホールドレベル設
定用電源、１４・・・カウンタ、１５・・・プリセット
値設定器、１６・・・ＮＡＮＤゲート。FIG. 1 is a block diagram showing an embodiment of a tone detection circuit according to the present invention. FIG. 2 is a diagram showing an example of a timing chart showing the operation of the tone detection circuit of FIG. 1. DESCRIPTION OF SYMBOLS 1... Input terminal of electric signal for information transmission, 2... Input terminal of clock signal, 3... Output terminal of tone detection signal, 11... 1--n filter, 12... Threshold board Detector, 13...Power supply for threshold level setting, 14...Counter, 15...Preset value setter, 16...NAND gate.
Claims (1)
前記トーンフィルタの出力を整形するためのスレシュホ
ールド検出器と、前記スレシュホールド検出器の出力が
一定期間だけ持続した後でトーン検出信号パルスを送出
する機能を有するカウンタと、前記カウンタにプリセッ
ト信号を与えて前記一定期間の値を決定するためのプリ
セット値設定器とから構成したことを特徴とする１・−
ン検出回路。A tone filter for passing one tone signal;
a threshold detector for shaping the output of the tone filter; a counter having a function of transmitting a tone detection signal pulse after the output of the threshold detector continues for a certain period; and a preset signal to the counter. and a preset value setter for determining the value for the certain period of time based on the given value.
detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18832082U JPS5991061U (en) | 1982-12-13 | 1982-12-13 | Tone detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18832082U JPS5991061U (en) | 1982-12-13 | 1982-12-13 | Tone detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5991061U true JPS5991061U (en) | 1984-06-20 |
Family
ID=30406291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18832082U Pending JPS5991061U (en) | 1982-12-13 | 1982-12-13 | Tone detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5991061U (en) |
-
1982
- 1982-12-13 JP JP18832082U patent/JPS5991061U/en active Pending
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