JPS5123402B1 - - Google Patents
Info
- Publication number
- JPS5123402B1 JPS5123402B1 JP46084029A JP8402971A JPS5123402B1 JP S5123402 B1 JPS5123402 B1 JP S5123402B1 JP 46084029 A JP46084029 A JP 46084029A JP 8402971 A JP8402971 A JP 8402971A JP S5123402 B1 JPS5123402 B1 JP S5123402B1
- Authority
- JP
- Japan
- 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.)
- Pending
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
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9938370A | 1970-12-18 | 1970-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5123402B1 true JPS5123402B1 (ja) | 1976-07-16 |
Family
ID=22274755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP46084029A Pending JPS5123402B1 (ja) | 1970-12-18 | 1971-10-25 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3686576A (ja) |
| JP (1) | JPS5123402B1 (ja) |
| CA (1) | CA940206A (ja) |
| DE (1) | DE2159059A1 (ja) |
| FR (1) | FR2118090B1 (ja) |
| GB (1) | GB1359693A (ja) |
| IT (1) | IT943926B (ja) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA984068A (en) * | 1972-08-10 | 1976-02-17 | Alexander D. Proudfoot | Method and apparatus for detecting the presence of signal components of predetermined frequency in a multi-frequency signal |
| 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 |
| FR2370386A1 (fr) * | 1976-11-05 | 1978-06-02 | Constr Telephoniques | Melangeur pour recepteur de signaux multifrequences |
| FR2373926A1 (fr) * | 1976-12-10 | 1978-07-07 | Constr Telephoniques | Recepteur de signaux multifrequences |
| US6674855B1 (en) | 1999-10-06 | 2004-01-06 | Comverse Ltd. | High performance multifrequency signal detection |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL91655C (ja) * | 1900-01-01 | |||
| US3189835A (en) * | 1961-05-01 | 1965-06-15 | Anelex Corp | Pulse retiming system |
| US3219935A (en) * | 1961-08-08 | 1965-11-23 | Yokogawa Electric Corp | Measuring-counting system for determining and control-circuit for continuously providing exact multiple of unknown frequency input |
| US3354398A (en) * | 1965-06-07 | 1967-11-21 | Collins Radio Co | Digital frequency comparator |
| DE1563618B1 (de) * | 1966-06-21 | 1970-12-17 | Philips Patentverwaltung | Mehrfach-Regelanordnung fuer Regelkreise,deren Regelgroessen in einem durch die Einzel-Sollwerte bestimmten Verhaeltnis stehen sollen |
| US3501701A (en) * | 1967-06-19 | 1970-03-17 | Nasa | Digital frequency discriminator |
| SE324835B (ja) * | 1968-10-14 | 1970-06-15 | Asea Ab |
-
1970
- 1970-12-18 US US99383A patent/US3686576A/en not_active Expired - Lifetime
-
1971
- 1971-10-25 JP JP46084029A patent/JPS5123402B1/ja active Pending
- 1971-10-27 GB GB4981671A patent/GB1359693A/en not_active Expired
- 1971-11-29 DE DE19712159059 patent/DE2159059A1/de active Pending
- 1971-12-06 CA CA129,325A patent/CA940206A/en not_active Expired
- 1971-12-09 FR FR7144971A patent/FR2118090B1/fr not_active Expired
- 1971-12-14 IT IT32352/71A patent/IT943926B/it active
Also Published As
| Publication number | Publication date |
|---|---|
| CA940206A (en) | 1974-01-15 |
| GB1359693A (en) | 1974-07-10 |
| FR2118090B1 (ja) | 1974-06-07 |
| IT943926B (it) | 1973-04-10 |
| DE2159059A1 (de) | 1972-06-22 |
| FR2118090A1 (ja) | 1972-07-28 |
| US3686576A (en) | 1972-08-22 |