GB1408796A - Circuitry for monitoring periodic signals - Google Patents
Circuitry for monitoring periodic signalsInfo
- Publication number
- GB1408796A GB1408796A GB5793772A GB5793772A GB1408796A GB 1408796 A GB1408796 A GB 1408796A GB 5793772 A GB5793772 A GB 5793772A GB 5793772 A GB5793772 A GB 5793772A GB 1408796 A GB1408796 A GB 1408796A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base
- dec
- transistors
- discharges
- input signal
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Manipulation Of Pulses (AREA)
- Monitoring And Testing Of Exchanges (AREA)
Abstract
1408796 Frequency detectors COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS CIT-ALCATEL 15 Dec 1972 [15 Dec 1971] 57937/72 Heading H3A A monitor circuit comprises: two transistors T1, T2 of the same conductivity type with the collector of T1 connected to the base of T2 and an input signal to be monitored connected to the base of T1; time constant circuits RC1, RD1, C1, RC2, RD2, C2 connected to the emittercollector circuits of respective ones of the transistors so that one capacitor charges when the other discharges; and a detector coupled to the two time constant circuits for detecting a change in the rate of repetition of signals applied at the base of T1. When an input signal at point E1 goes positive, T1 conducts discharging C1 and cutting off T2 to charge C2. Conversely when the signal at E1 goes negative C1 charges and C2 discharges. A fall in the pulse rate outside predetermined limits allows C2 time to charge sufficiently to turn on unijunction transistor UST and fire thyristor TH. Relay RR is then actuated to give an indication that an abnormal condition occurs.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7145061A FR2165039A5 (en) | 1971-12-15 | 1971-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1408796A true GB1408796A (en) | 1975-10-08 |
Family
ID=9087518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5793772A Expired GB1408796A (en) | 1971-12-15 | 1972-12-15 | Circuitry for monitoring periodic signals |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE792551A (en) |
| CH (1) | CH568686A5 (en) |
| DE (1) | DE2260760A1 (en) |
| FR (1) | FR2165039A5 (en) |
| GB (1) | GB1408796A (en) |
| IT (1) | IT976038B (en) |
| NL (1) | NL7217081A (en) |
| SE (1) | SE389252B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2440162C2 (en) * | 1974-08-21 | 1981-12-10 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Circuit arrangement for signal-technically safe monitoring of periodic pulses |
| US4117348A (en) * | 1977-07-11 | 1978-09-26 | Rockwell International Corporation | Multi-phase clock monitor circuit |
| DE2945984C2 (en) * | 1979-11-14 | 1982-05-27 | Eurosil GmbH, 8000 München | Circuit arrangement for signaling the failure of periodic pulse signals |
-
0
- BE BE792551D patent/BE792551A/en unknown
-
1971
- 1971-12-15 FR FR7145061A patent/FR2165039A5/fr not_active Expired
-
1972
- 1972-12-11 CH CH1795672A patent/CH568686A5/xx not_active IP Right Cessation
- 1972-12-12 DE DE19722260760 patent/DE2260760A1/en active Pending
- 1972-12-14 IT IT7091672A patent/IT976038B/en active
- 1972-12-14 SE SE1633672A patent/SE389252B/en unknown
- 1972-12-15 GB GB5793772A patent/GB1408796A/en not_active Expired
- 1972-12-15 NL NL7217081A patent/NL7217081A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NL7217081A (en) | 1973-06-19 |
| CH568686A5 (en) | 1975-10-31 |
| BE792551A (en) | 1973-06-12 |
| DE2260760A1 (en) | 1973-06-20 |
| SE389252B (en) | 1976-10-25 |
| IT976038B (en) | 1974-08-20 |
| FR2165039A5 (en) | 1973-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |