IT1213174B - Monolithic metering signal generator for telephone - Google Patents
Monolithic metering signal generator for telephoneInfo
- Publication number
- IT1213174B IT1213174B IT8421270A IT2127084A IT1213174B IT 1213174 B IT1213174 B IT 1213174B IT 8421270 A IT8421270 A IT 8421270A IT 2127084 A IT2127084 A IT 2127084A IT 1213174 B IT1213174 B IT 1213174B
- Authority
- IT
- Italy
- Prior art keywords
- signal
- voltage generator
- circuit
- monolithic
- telephone
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 abstract 1
Landscapes
- Meter Arrangements (AREA)
Abstract
The monolithic integrated telephone circuit forms part of the exchange equipment and has a call charge signal regulator. The signal is formed by an a.c. voltage generator (TTX), of constant amplitude and frequency, typically 12 to 16 kHz, and a unidirectional voltage generator (IG) with a trapezoidal wave form. The signal is produced by multiplying (X) the outputs of the two generators. The signal is added (S) to the speech circuit (VC) and sent out on the transmission line. At a point (N) in the circuit (VC) the signal is extracted by a high pass filter (F) to eliminate speech, and then rectified (/v/). The rectified voltage is compared (COMP) with a set reference (VREF) and applied to a control circuit (LC) to regulate the trapezoidal voltage generator (FG). This regulation ensures a constant and adequate charge signal amplitude on the line.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8421270A IT1213174B (en) | 1984-06-06 | 1984-06-06 | Monolithic metering signal generator for telephone |
ES542548A ES8700528A1 (en) | 1984-05-04 | 1985-04-25 | Monolithically integratable telephone circuit for generating control signals for displaying telephone charges |
SE8502130A SE456630B (en) | 1984-05-04 | 1985-05-02 | TELEPHONIC RIGHTS WHICH CAN BE INTEGRATED MONOLITICALLY AND WHICH CREATES CONTROL SIGNALS TO SUBSCRIPTION PRESENTATION UNIT |
FR8506722A FR2563957B1 (en) | 1984-05-04 | 1985-05-03 | TELEPHONE CIRCUIT, INTEGRABLE MONOLITHICALLY, GENERATOR OF CONTROL SIGNALS FOR INDICATORS OF TAXATION OF SUBSCRIBERS |
BR8502116A BR8502116A (en) | 1984-05-04 | 1985-05-03 | MONOLITICALLY INTEGRABLE TELEPHONE CIRCUIT TO GENERATE CONTROL SIGNS FOR USER BILLING INDICATORS |
DE3516007A DE3516007C2 (en) | 1984-05-04 | 1985-05-03 | Monolithically integrable telephone circuit with control signal generator for charge indicators |
US06/731,167 US4638122A (en) | 1984-05-04 | 1985-05-06 | Monolithically integratable telephone circuit for generating control signals for displaying telephone charges |
GB08511492A GB2161045B (en) | 1984-05-04 | 1985-05-07 | Improvements in or relating to charging signal producing circuits for telephone exchanges |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT8421270A IT1213174B (en) | 1984-06-06 | 1984-06-06 | Monolithic metering signal generator for telephone |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8421270A0 IT8421270A0 (en) | 1984-06-06 |
IT1213174B true IT1213174B (en) | 1989-12-14 |
Family
ID=11179314
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT8421270A IT1213174B (en) | 1984-05-04 | 1984-06-06 | Monolithic metering signal generator for telephone |
Country Status (1)
Country | Link |
---|---|
IT (1) | IT1213174B (en) |
-
1984
- 1984-06-06 IT IT8421270A patent/IT1213174B/en active
Also Published As
Publication number | Publication date |
---|---|
IT8421270A0 (en) | 1984-06-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2374768A1 (en) | POWER SUPPLY REGULATED BY SWITCHING | |
EP0129181A3 (en) | Dc-dc converter | |
SE8502130D0 (en) | THE TELEPHONIC RIGHT WHICH CAN BE INTEGRATED MONOLITICALLY WHICH IS GIVING CONTROL SIGNALS TO EXTEND THE CHARGE FOR THE USER | |
US4987361A (en) | Switching regulator having a constant current through its inductance | |
IT1213174B (en) | Monolithic metering signal generator for telephone | |
DE2938533C2 (en) | ||
ES8607659A1 (en) | Monolithically integratable telephone circuit for generating control signals for displaying the telephone charges to a subscriber | |
FR2441947A1 (en) | Polyphase mains-operated converter compensating for frequency changes - has sawtooth generators with integrators charged to same amplitude (NL 20.5.80) | |
DE3060740D1 (en) | Triangular voltage generator | |
DE3688552T2 (en) | Electronic control device for supplying a resistance welding system with electrical energy. | |
AU2223683A (en) | Regulated power supply | |
JPS5653576A (en) | Power circuit | |
JPS5787604A (en) | Power supply circuit for amplifier | |
JPS56163000A (en) | Automatic voltage regulator | |
JPS55106080A (en) | Full-wave rectifying circuit | |
ES8606750A1 (en) | Generator of senoidal waves by modulation of wave width for uninterrupted feeding systems (Machine-translation by Google Translate, not legally binding) | |
JPS5577235A (en) | Signal conversion circuit | |
JPS56129598A (en) | Nonlinear speed regulation control system for electric governor | |
JPS56129577A (en) | Current control device of thyristor converter circuit | |
JPS57120132A (en) | Switching power supply circuit | |
JPS54112625A (en) | Power feeder | |
JPS5685120A (en) | Alternating constant voltage power supply device | |
FR2438374A1 (en) | Voltage control circuit for generator output - has thyristor and diode bridge rectifier circuits and synchronisation generator with inputs connected to photocoupler(s) | |
JPS53111266A (en) | Regulator for pulse duty | |
JPS566698A (en) | Method of controlling scherbius system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970628 |