JPS5752289A - Multifrequency signal receiver - Google Patents
Multifrequency signal receiverInfo
- Publication number
- JPS5752289A JPS5752289A JP12597380A JP12597380A JPS5752289A JP S5752289 A JPS5752289 A JP S5752289A JP 12597380 A JP12597380 A JP 12597380A JP 12597380 A JP12597380 A JP 12597380A JP S5752289 A JPS5752289 A JP S5752289A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- output
- rectified
- circuits
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
Abstract
PURPOSE:To make a device small-sized without deteriorating this function, by constituting a system so that a rectified wave detecting threshold level of a common rectifying circuit connected to the rear stage of a signal detecting circuit is made variable by an output of a time-limiting circuit. CONSTITUTION:Outputs of signal detecting circuits 6-9 are applied to discrimination and holding circuits 30-33, and also are applied to a rectifying circuit 15 through an OR circuit 14. A variable threshold level circuit 16 applies a continuous single pulse wave corresponding to length of a pulse train signal, to the circuit 16 in case when a level of a smoothed and rectified signal obtained from the circuit 15 has exceeded a threshold level provided from the time limiting circuit 16. The circuit 16 applies a gate signal to the circuits 30-33 and 34 in case when time length of the signal is longer than a set time. The circuits 30-33 read an input signal, decide that there is a signal in case when the input signal is above a prescribed level, hold it instantaneously, and simultaneously output an output by length of the gate signal, to output terminals 26-29. On the other hand, even if the smoothed and rectified signal becomes lower than the threshold level, the rectified output becomes a high level and is held while there is an output of the circuit 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12597380A JPS5752289A (en) | 1980-09-12 | 1980-09-12 | Multifrequency signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12597380A JPS5752289A (en) | 1980-09-12 | 1980-09-12 | Multifrequency signal receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5752289A true JPS5752289A (en) | 1982-03-27 |
Family
ID=14923569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12597380A Pending JPS5752289A (en) | 1980-09-12 | 1980-09-12 | Multifrequency signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5752289A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58154137U (en) * | 1982-04-09 | 1983-10-15 | 江崎グリコ株式会社 | Bag-shaped container that is easy to open |
-
1980
- 1980-09-12 JP JP12597380A patent/JPS5752289A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58154137U (en) * | 1982-04-09 | 1983-10-15 | 江崎グリコ株式会社 | Bag-shaped container that is easy to open |
| JPS6242909Y2 (en) * | 1982-04-09 | 1987-11-05 |
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