JPS556941A - Signal reception system - Google Patents
Signal reception systemInfo
- Publication number
- JPS556941A JPS556941A JP7939378A JP7939378A JPS556941A JP S556941 A JPS556941 A JP S556941A JP 7939378 A JP7939378 A JP 7939378A JP 7939378 A JP7939378 A JP 7939378A JP S556941 A JPS556941 A JP S556941A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- received
- pushphone
- relay
- case
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
Abstract
PURPOSE:To ensure an accurate reception for both the double frequency combination signal and the single frequency signal via one unit of the receiver by deciding normal and accepting the signals in case both the 1st and 2nd digits feature the same signal type and on the other hand deciding erroneous and deleting the signals in case the signal type differs between the two digits. CONSTITUTION:When the signal sent from the pushphone is received as the 1st digit of the signal, relay MF operates to keep the operation. In case the single frequency signal is received when the pushphone signal is received at the 1st digit with the operation of relay MF kept, i.e., while the second and subsequent digits of the pushphone signal are being received, alarm relay AL is actuated to alarm the malfunction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7939378A JPS556941A (en) | 1978-06-30 | 1978-06-30 | Signal reception system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7939378A JPS556941A (en) | 1978-06-30 | 1978-06-30 | Signal reception system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS556941A true JPS556941A (en) | 1980-01-18 |
Family
ID=13688608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7939378A Pending JPS556941A (en) | 1978-06-30 | 1978-06-30 | Signal reception system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS556941A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6471292A (en) * | 1987-08-14 | 1989-03-16 | Mitel Corp | Dial tone detector |
-
1978
- 1978-06-30 JP JP7939378A patent/JPS556941A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6471292A (en) * | 1987-08-14 | 1989-03-16 | Mitel Corp | Dial tone detector |
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