ES451494A1 - Vf signal receiver - Google Patents
Vf signal receiverInfo
- Publication number
- ES451494A1 ES451494A1 ES451494A ES451494A ES451494A1 ES 451494 A1 ES451494 A1 ES 451494A1 ES 451494 A ES451494 A ES 451494A ES 451494 A ES451494 A ES 451494A ES 451494 A1 ES451494 A1 ES 451494A1
- Authority
- ES
- Spain
- Prior art keywords
- signal
- signal receiver
- duration
- interference
- trigger circuit
- 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
- 238000005259 measurement Methods 0.000 abstract 1
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
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Manipulation Of Pulses (AREA)
- Measurement Of Current Or Voltage (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The signal receiver is intended to identify the end of a signal as soon as possible and on the other hand not to separate the signal in the event of signal interruption due to interference. For these purposes, a monostable trigger circuit (MK) is used whose self-holding period corresponds to the duration of the longest interference and the duration of at least one measurement which follows the main test once the presence of a signal has been identified provided that the half-period results and preliminary test results are positive, a trigger signal is transmitted, with each zero passage of the AC input voltage, to the trigger circuit which is held thereby and which interrupts the signal receiver output signal only when it is released.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2540859A DE2540859C2 (en) | 1975-09-13 | 1975-09-13 | Circuit arrangement for a selective character receiver, in particular for telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES451494A1 true ES451494A1 (en) | 1977-10-01 |
Family
ID=5956376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES451494A Expired ES451494A1 (en) | 1975-09-13 | 1976-09-13 | Vf signal receiver |
Country Status (11)
| Country | Link |
|---|---|
| AT (1) | AT353852B (en) |
| BE (1) | BE846033R (en) |
| CH (1) | CH625925A5 (en) |
| DE (1) | DE2540859C2 (en) |
| DK (1) | DK412176A (en) |
| ES (1) | ES451494A1 (en) |
| FR (1) | FR2324182A1 (en) |
| GB (1) | GB1529758A (en) |
| NL (1) | NL7609996A (en) |
| NO (1) | NO763089L (en) |
| SE (1) | SE7610009L (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2334426A1 (en) * | 1973-07-06 | 1975-01-23 | Telefonbau & Normalzeit Gmbh | EVALUATOR FOR VOICE-PROTECTED FREQUENCY SELECTIVE SIGN RECEIVERS ACCORDING TO THE MULTI-FREQUENCY METHOD |
| DE2341224C3 (en) * | 1973-08-16 | 1982-01-07 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Method for frequency recognition in selective character receivers for telecommunication systems, in particular telephone systems |
| DE2341225B2 (en) * | 1973-08-16 | 1976-10-28 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | SELECTIVE SIGN RECEIVER FOR REMOTE INDICATORS, IN PARTICULAR TELEPHONE SYSTEMS |
-
1975
- 1975-09-13 DE DE2540859A patent/DE2540859C2/en not_active Expired
-
1976
- 1976-09-09 NL NL7609996A patent/NL7609996A/en not_active Application Discontinuation
- 1976-09-09 GB GB37380/76A patent/GB1529758A/en not_active Expired
- 1976-09-09 NO NO763089A patent/NO763089L/no unknown
- 1976-09-10 BE BE2055295A patent/BE846033R/en active
- 1976-09-10 CH CH1150576A patent/CH625925A5/en not_active IP Right Cessation
- 1976-09-10 SE SE7610009A patent/SE7610009L/en unknown
- 1976-09-13 DK DK412176A patent/DK412176A/en unknown
- 1976-09-13 FR FR7627478A patent/FR2324182A1/en not_active Withdrawn
- 1976-09-13 AT AT675776A patent/AT353852B/en not_active IP Right Cessation
- 1976-09-13 ES ES451494A patent/ES451494A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ATA675776A (en) | 1979-05-15 |
| NO763089L (en) | 1977-03-15 |
| SE7610009L (en) | 1977-03-14 |
| NL7609996A (en) | 1977-03-15 |
| GB1529758A (en) | 1978-10-25 |
| AT353852B (en) | 1979-12-10 |
| BE846033R (en) | 1977-03-10 |
| DE2540859A1 (en) | 1977-03-17 |
| DE2540859C2 (en) | 1984-01-12 |
| FR2324182A1 (en) | 1977-04-08 |
| DK412176A (en) | 1977-03-14 |
| CH625925A5 (en) | 1981-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FD1A | Patent lapsed |
Effective date: 19970612 |