ES453636A1 - Circuit arrangement for a digital multifrequency-signal receiver - Google Patents
Circuit arrangement for a digital multifrequency-signal receiverInfo
- Publication number
- ES453636A1 ES453636A1 ES453636A ES453636A ES453636A1 ES 453636 A1 ES453636 A1 ES 453636A1 ES 453636 A ES453636 A ES 453636A ES 453636 A ES453636 A ES 453636A ES 453636 A1 ES453636 A1 ES 453636A1
- Authority
- ES
- Spain
- Prior art keywords
- frequencies
- group
- signal
- digital
- signal receiver
- 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
- 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)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Telephone Function (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Electronic Switches (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
A device for a digital multifrequency signal receiver, for recognizing different signal frequencies transmitted as a signal, simultaneously, and in a different group of frequencies, comprising, for each group of frequencies, counters to measure the time between crossings of zero, and devices that, when an interference signal is detected, provide a reset signal that causes the count for the involved frequency group to start again, particularly for digital keypad signal receivers in telephone systems characterized in that the The evaluation of each group of frequencies is isolated to a sequential circuit (FS) for each other group of frequencies, because the reset signal (R) of each group of frequencies is applied to the inputs of all the sequential circuits assigned to said group of frequencies. frequencies, and because the output of each sequential circuit is coupled to the reset inputs (RN, RT) of the counters s (NT, TZ) of another group of frequencies. (Machine-translation by Google Translate, not legally binding)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2553258A DE2553258C3 (en) | 1975-11-27 | 1975-11-27 | Circuit arrangement for a digital multi-frequency character receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES453636A1 true ES453636A1 (en) | 1977-11-16 |
Family
ID=5962770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES453636A Expired ES453636A1 (en) | 1975-11-27 | 1976-11-25 | Circuit arrangement for a digital multifrequency-signal receiver |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE848776R (en) |
| CA (1) | CA1078980A (en) |
| CH (1) | CH601955A5 (en) |
| DE (1) | DE2553258C3 (en) |
| ES (1) | ES453636A1 (en) |
| FR (1) | FR2333398A1 (en) |
| GB (1) | GB1545254A (en) |
| ZA (1) | ZA766727B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7903346A (en) * | 1979-04-27 | 1980-10-29 | Bell Telephone Mfg | DIGITAL SIGNALING SYSTEM. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3912869A (en) * | 1973-11-21 | 1975-10-14 | Tel Tone Corp | Multifrequency-to-digital converter |
-
1975
- 1975-11-27 DE DE2553258A patent/DE2553258C3/en not_active Expired
-
1976
- 1976-11-10 ZA ZA766727A patent/ZA766727B/en unknown
- 1976-11-17 FR FR7634661A patent/FR2333398A1/en active Granted
- 1976-11-23 GB GB48774/76A patent/GB1545254A/en not_active Expired
- 1976-11-24 CA CA266,460A patent/CA1078980A/en not_active Expired
- 1976-11-25 ES ES453636A patent/ES453636A1/en not_active Expired
- 1976-11-25 CH CH1482876A patent/CH601955A5/xx not_active IP Right Cessation
- 1976-11-26 BE BE2055485A patent/BE848776R/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE2553258A1 (en) | 1977-06-02 |
| GB1545254A (en) | 1979-05-02 |
| DE2553258B2 (en) | 1979-10-25 |
| FR2333398B1 (en) | 1982-10-22 |
| ZA766727B (en) | 1977-10-26 |
| FR2333398A1 (en) | 1977-06-24 |
| BE848776R (en) | 1977-05-26 |
| CA1078980A (en) | 1980-06-03 |
| CH601955A5 (en) | 1978-07-14 |
| DE2553258C3 (en) | 1980-07-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1460995A (en) | Method for frequency-recognition in selective signal receivers for use in telecommunication particularly telephone systems selective signal receiver for use in telecommunication | |
| ES453636A1 (en) | Circuit arrangement for a digital multifrequency-signal receiver | |
| CA1035879A (en) | Multifrequency signal receiver timing circuit | |
| GB1460996A (en) | Selective signal receiver for use in telecommunication particu larly telephone systems | |
| GB906652A (en) | Spectrum analyser | |
| NO145122C (en) | HOLDING CIRCUIT IN A RECEIVER DEVICE FOR DETECTING TWO TONE FREQUENCIES IN A TONE SIGNAL. | |
| US3299216A (en) | Signal evaluation circuits | |
| SU801320A1 (en) | Audio call receiver | |
| ES314882A1 (en) | Frequency-shift data receiver | |
| SU886323A2 (en) | Voice-frequency ringing receiver | |
| JPS5338912A (en) | Sending/stop system for signal sound | |
| FR2450006A1 (en) | Programmable digital signal generator - has counter driven by clock and connected to phase authorisation device comprising memories and registers | |
| ES327156A1 (en) | Procedure and disposal of circuit to reduce the mutual interference of electric pulses, particularly in telephone link systems. (Machine-translation by Google Translate, not legally binding) | |
| SE8001394L (en) | RADIO RECEIVERS WITH ELECTRONIC VOTING | |
| GB1354010A (en) | Multifrequency signal receivers | |
| JPS5394707A (en) | Circuit for identifying dial impulse signal and incoming signal of telephone set | |
| FR2385258A1 (en) | Frequency comparator selector and filter - uses electronic switch to short circuit output if input frequency is not within passband | |
| JPS5255804A (en) | Reception frequency registering system at corded b board | |
| JPS52152104A (en) | Multi-frequency signal receiver | |
| GB1306859A (en) | Communication receivers | |
| JPS5326642A (en) | Graphic equ alizer | |
| GB936810A (en) | An automatic telephone system | |
| GB853710A (en) | Improvements in or relating to electrical traffic analysers | |
| ES431952A3 (en) | Inhibitor circuit of errors due to chokks for a receiver of multiple tonalities. (Machine-translation by Google Translate, not legally binding) | |
| ES219414A1 (en) | A radio-receiver (Machine-translation by Google Translate, not legally binding) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FD1A | Patent lapsed |
Effective date: 19970612 |