FR2180901B1 - - Google Patents
Info
- Publication number
- FR2180901B1 FR2180901B1 FR7313951A FR7313951A FR2180901B1 FR 2180901 B1 FR2180901 B1 FR 2180901B1 FR 7313951 A FR7313951 A FR 7313951A FR 7313951 A FR7313951 A FR 7313951A FR 2180901 B1 FR2180901 B1 FR 2180901B1
- Authority
- FR
- France
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/12—Arrangements providing for calling or supervisory signals
-
- 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
- H04Q1/4575—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 which are transmitted in digital form
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7205132A NL154386B (en) | 1972-04-17 | 1972-04-17 | SIGNALING SYSTEM. |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2180901A1 FR2180901A1 (en) | 1973-11-30 |
FR2180901B1 true FR2180901B1 (en) | 1979-03-30 |
Family
ID=19815859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7313951A Expired FR2180901B1 (en) | 1972-04-17 | 1973-04-17 |
Country Status (5)
Country | Link |
---|---|
DE (1) | DE2318172C3 (en) |
FR (1) | FR2180901B1 (en) |
IT (1) | IT980245B (en) |
NL (1) | NL154386B (en) |
SE (1) | SE380701B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL177169B (en) * | 1978-09-08 | 1985-03-01 | Nederlanden Staat | APPARATUS FOR DETERMINING THE PRESENCE OF ONE OR MORE OF A NUMBER OF FREQUENCIES IN PULSE CODE MODULATED SIGNALS. |
AT374325B (en) * | 1980-04-18 | 1984-04-10 | Siemens Ag Oesterreich | DEVICE FOR GENERATING TWO ELECTRIC VIBRATIONS OF DIFFERENT FREQUENCIES, IN PARTICULAR FOR GENERATING CODE-CHARACTERS FOR MULTI-FREQUENCY CODE SELECTION |
US4620294A (en) * | 1983-09-09 | 1986-10-28 | Cts Corporation | Digital signal processor modem |
US4599583A (en) * | 1983-11-19 | 1986-07-08 | Fujitsu Limited | Mixed dual frequency generating system |
DE4408323C2 (en) * | 1994-03-11 | 1999-03-11 | Siemens Ag | Method for generating a digital sinusoidal signal with a predetermined sampling rate and circuit arrangement for carrying out the method |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL267387A (en) * | 1960-08-23 |
-
1972
- 1972-04-17 NL NL7205132A patent/NL154386B/en not_active IP Right Cessation
-
1973
- 1973-04-11 DE DE19732318172 patent/DE2318172C3/en not_active Expired
- 1973-04-13 SE SE7305320A patent/SE380701B/en unknown
- 1973-04-17 FR FR7313951A patent/FR2180901B1/fr not_active Expired
- 1973-04-17 IT IT4949273A patent/IT980245B/en active
Also Published As
Publication number | Publication date |
---|---|
NL7205132A (en) | 1973-10-19 |
DE2318172C3 (en) | 1975-09-25 |
NL154386B (en) | 1977-08-15 |
FR2180901A1 (en) | 1973-11-30 |
DE2318172B2 (en) | 1975-02-20 |
DE2318172A1 (en) | 1973-10-25 |
IT980245B (en) | 1974-09-30 |
SE380701B (en) | 1975-11-10 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |