GB1372754A - Tone ringer circuits - Google Patents
Tone ringer circuitsInfo
- Publication number
- GB1372754A GB1372754A GB230372A GB230372A GB1372754A GB 1372754 A GB1372754 A GB 1372754A GB 230372 A GB230372 A GB 230372A GB 230372 A GB230372 A GB 230372A GB 1372754 A GB1372754 A GB 1372754A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tone
- voltage
- wire
- signal
- amplitude
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
1372754 Substation circuits WESTERN ELECTRIC CO Inc 18 Jan 1972 [18 Jan 1971] 2303/72 Heading H4K A ringing tone generator in a sub-set is activated by ringing current on the line via circuitry including a voltage threshold circuit 210, a voltage amplitude limiting circuit 211 and a rectifying circuit 212 so as to prevent actuation of the ringer by noise or dialling signals. A continuous, intermittent, amplitude modulated or frequency modulated tone may be produced and the tone generator may be powered by rectifying the line ringing current. In operation ringing signal arriving at 101, 102 activates a voltage amplitude threshold circuit 210 including back to back Zener diodes D1, D2, D3, D4, assuming the received signal is above the threshold and the threshold circuit produces an output signal or wire 202 which is amplitude limited by circuit 211 comprising two pairs of transistors in Darlington configuration. The amplitude limited signal is then used to charge a capacitor C3 in charging circuit 212 over ¥ of a cycle to a voltage approaching twice the maximum voltage on wire 202, the voltage to which it charges being governed by the energy of the signal on wire 202. The charging of capacitor C3 above a threshold level enables a power supply 106 via gate 213 so as to provide D.C. power, derived by rectifying the ringing signals on wire 203, to a tone generator 104 which produces a tone signal at electroacoustical transducer 105. The power is supplied on wire 204 i.e. across capacitor C4, and is in the form of a ripple voltage which is connected to the astable multivibrator via a transistor T9 turned on by gate 213. In order that the multivibrator may have a constant frequency output, amplitude modulated due to the "ripple" on wire 215, transistors T9 and T10 are arranged to turn on and off so as to maintain wire 215 at a voltage which is directly proportional to the emitter-base turnon voltage of transistor T10. Transistors T9, T10 also provide the additional feature of assuring that transistors T5, T6 "snap" on in the presence of valid signals. If the power supply capacitor C4 has become charged due to transients and a valid ringing signal has not been detected, gate 213 is closed and transistor T9 is held off preventing power from reaching the multivibrator circuit. A transistor T15 is also held off to mute the transducer 105. To produce tones other than an amplitude modulated constant frequency tone additional circuitry is connected to points 1, 2, 3. In Fig. 4A (not shown) points 1 and 2 are coupled by a pair of back to back diodes and the common point of the diodes is connected via a switch to a D.C. source of negative potential. The switch may be situated at a second telephone in an intercom system, the closing of the switch causing the tone generator at the first telephone to emit a constant amplitude frequency tone which can be distinguished from the amplitude modulated tone caused by exchange ringing current. Fig. 4B (not shown) shows the modification necessary to produce an intermittent constant frequency tone for use in an intercom system as above described. A square wave generator is connected between the two diodes and is arranged to switch the supply to terminal 1 on and off, thereby to produce the tone. In a further embodiment (Fig. 4C, not shown) the square wave generator is connected to point 3 and a continuous two-tone signal is produced. Instead of the switch being manually operated as in an intercom system, it may be arranged to be operated automatically on receipt of exchange ringing current by the telephone. The extra power supply and extra circuitry are then all housed in the single set.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10732971A | 1971-01-18 | 1971-01-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1372754A true GB1372754A (en) | 1974-11-06 |
Family
ID=22316077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB230372A Expired GB1372754A (en) | 1971-01-18 | 1972-01-18 | Tone ringer circuits |
Country Status (9)
Country | Link |
---|---|
JP (1) | JPS5738065B1 (en) |
BE (1) | BE778121A (en) |
CA (3) | CA952634A (en) |
CH (1) | CH544473A (en) |
DE (1) | DE2201764C3 (en) |
ES (1) | ES399297A1 (en) |
FR (1) | FR2122468B1 (en) |
GB (1) | GB1372754A (en) |
IT (1) | IT948859B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2121648A (en) * | 1982-05-24 | 1983-12-21 | Tad Avanti | Ring detector and telephone line monitoring system for telephone answering instrument |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5076707U (en) * | 1973-11-14 | 1975-07-03 | ||
JPS5180105A (en) * | 1975-01-09 | 1976-07-13 | Nakayo Telecommunications | |
JPS526005A (en) * | 1975-07-04 | 1977-01-18 | Oki Electric Ind Co Ltd | Tone ringer receiving system |
CH619332A5 (en) * | 1976-02-02 | 1980-09-15 | Intertel Ii Inc | Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system |
JPS5547019A (en) * | 1978-09-27 | 1980-04-02 | Sanden Corp | Sound insulation device for electromagnetic clutch |
WO1981000657A1 (en) * | 1979-08-20 | 1981-03-05 | Western Electric Co | Electronic tone ringer |
JPS6216669U (en) * | 1985-07-12 | 1987-01-31 | ||
DE3535868C1 (en) * | 1985-10-08 | 1987-05-21 | Texas Instruments Deutschland | Call signal recognition circuitry for telephone subscriber's appts. - has current sensor between rectifier and diode supplying detector sensing frequency |
DE4212858A1 (en) * | 1992-04-16 | 1993-10-21 | Siemens Ag | Ringer |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2951910A (en) * | 1958-01-14 | 1960-09-06 | North Electric Co | Substation signalling device |
US3210479A (en) * | 1962-08-30 | 1965-10-05 | Automatic Elect Lab | Voice-frequency selective signalling arrangement |
FR1444467A (en) * | 1964-08-25 | 1966-07-01 | Sits Soc It Telecom Siemens | Set of components forming a variable note ringtone, especially for subscriber telephone set |
US3508012A (en) * | 1967-11-24 | 1970-04-21 | Bell Telephone Labor Inc | Compatible tone ringer |
-
1971
- 1971-09-01 CA CA121,898A patent/CA952634A/en not_active Expired
-
1972
- 1972-01-13 IT IT67107/72A patent/IT948859B/en active
- 1972-01-14 DE DE2201764A patent/DE2201764C3/en not_active Expired
- 1972-01-15 ES ES399297A patent/ES399297A1/en not_active Expired
- 1972-01-17 BE BE778121A patent/BE778121A/en not_active IP Right Cessation
- 1972-01-17 FR FR7201428A patent/FR2122468B1/fr not_active Expired
- 1972-01-18 CH CH70972A patent/CH544473A/en not_active IP Right Cessation
- 1972-01-18 GB GB230372A patent/GB1372754A/en not_active Expired
- 1972-01-18 JP JP672472A patent/JPS5738065B1/ja active Pending
-
1973
- 1973-05-28 CA CA172438A patent/CA939090A/en not_active Expired
- 1973-05-28 CA CA172437A patent/CA939089A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2121648A (en) * | 1982-05-24 | 1983-12-21 | Tad Avanti | Ring detector and telephone line monitoring system for telephone answering instrument |
Also Published As
Publication number | Publication date |
---|---|
CA939090A (en) | 1973-12-25 |
CA939089A (en) | 1973-12-25 |
BE778121A (en) | 1972-05-16 |
DE2201764C3 (en) | 1981-10-08 |
IT948859B (en) | 1973-06-11 |
FR2122468A1 (en) | 1972-09-01 |
CH544473A (en) | 1973-11-15 |
DE2201764A1 (en) | 1972-08-03 |
JPS4715005A (en) | 1972-08-17 |
FR2122468B1 (en) | 1975-08-29 |
JPS5738065B1 (en) | 1982-08-13 |
ES399297A1 (en) | 1975-05-01 |
CA952634A (en) | 1974-08-06 |
DE2201764B2 (en) | 1980-12-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |