SE8102552L - EMERGENCY COUNTER CIRCUIT - Google Patents
EMERGENCY COUNTER CIRCUITInfo
- Publication number
- SE8102552L SE8102552L SE8102552A SE8102552A SE8102552L SE 8102552 L SE8102552 L SE 8102552L SE 8102552 A SE8102552 A SE 8102552A SE 8102552 A SE8102552 A SE 8102552A SE 8102552 L SE8102552 L SE 8102552L
- Authority
- SE
- Sweden
- Prior art keywords
- zero
- counting
- alternating current
- passes
- counting pulse
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
- H04M15/28—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP with meter at substation or with calculation of charges at terminal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
Control circuit for a call counter, especially for call counting circuits where the counting pulses consist of a series of alternating current waves. In order to suppress transient processes which occur at the beginning and end of a counting pulse, the alternating current is switched both on and off when it passes through zero. The passing through zero is detected in a line transformer's primary winding, which is connected to the alternating current source. The zero-passing signals and the counting pulses are sent to a flip-flop circuit which turns on an electronic switch depending on whether both of these signals occur or only one of them. The counting pulse in the subscriber line consequently begins when the supplied alternating voltage passes through zero and the counting pulse in the subscriber loop is terminated when the phase- shifted alternating voltage in the subscriber loop passes through zero. <IMAGE>
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8102552A SE426130B (en) | 1981-04-22 | 1981-04-22 | Control circuit for a call counter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8102552A SE426130B (en) | 1981-04-22 | 1981-04-22 | Control circuit for a call counter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8102552L true SE8102552L (en) | 1982-10-23 |
| SE426130B SE426130B (en) | 1982-12-06 |
Family
ID=20343653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8102552A SE426130B (en) | 1981-04-22 | 1981-04-22 | Control circuit for a call counter |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE426130B (en) |
-
1981
- 1981-04-22 SE SE8102552A patent/SE426130B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE426130B (en) | 1982-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR920007502A (en) | Circuit device for discharge lamp operation | |
| NO902819D0 (en) | TRANSFER WITH GENERATION OF IS VALUE FOR STREAM. | |
| SE8102552L (en) | EMERGENCY COUNTER CIRCUIT | |
| JPS5672510A (en) | Muting circuit | |
| DE69318551D1 (en) | Integrated subscriber line interface circuit with slow polarity switch | |
| GB1422596A (en) | Oscillator circuit and protection arrangement therefor | |
| ATE21198T1 (en) | DEVICE FOR THE INDUCTIVE TRANSMISSION AND EVALUATION OF SIGNALS FROM A MOVABLE DEVICE TO AN EVALUATION CENTER. | |
| ES464223A1 (en) | Subscriber{3 s line equipment for a telephone exchange | |
| SE8201150L (en) | FOOD CIRCUIT FOR FLOOD TIME RELATIONS | |
| FR2360205A1 (en) | VOLTAGE CONVERTER DEVICE | |
| ATE121234T1 (en) | SWITCHING INVERTER WITH CURRENT SENSOR. | |
| JPS55126377A (en) | Current detecting circuit for arc welding machine | |
| JPS5295459A (en) | Hanging up magnet control device | |
| ES2104818T3 (en) | POWER SUPPLY UNIT. | |
| JPS5625375A (en) | Direct current-to-direct current converting circuit | |
| FR2244997A1 (en) | Monitoring device for electric cct. in vehicle - has transformer with primary winding in monitored cct. | |
| JPS5698661A (en) | Inductance measurememt device | |
| JPS5710820A (en) | Constant voltage power supply device | |
| JPS53136414A (en) | Sending system for subscriber's line signal | |
| RU1780588C (en) | Pulsating supply source | |
| SU1552370A2 (en) | Electronic relay | |
| FR2339944A1 (en) | ELECTRO-MAGNET SWITCHING CIRCUIT | |
| FR2395655A1 (en) | Ringing circuit and loop for telephone system - has semiconductor switch gating ringing signal source through to transformer primary | |
| JPS5340824A (en) | Combining circuit | |
| JPS57184361A (en) | Subscriber circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
Ref document number: 8102552-0 Effective date: 19880822 Format of ref document f/p: F |