LU78661A1 - - Google Patents
Info
- Publication number
- LU78661A1 LU78661A1 LU78661A LU78661A LU78661A1 LU 78661 A1 LU78661 A1 LU 78661A1 LU 78661 A LU78661 A LU 78661A LU 78661 A LU78661 A LU 78661A LU 78661 A1 LU78661 A1 LU 78661A1
- Authority
- LU
- Luxembourg
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
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Networks Using Active Elements (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7637276A FR2373934A1 (fr) | 1976-12-10 | 1976-12-10 | Dispositif de filtrage pour la detection de plusieurs frequences |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU78661A1 true LU78661A1 (xx) | 1978-07-12 |
Family
ID=9180912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU78661A LU78661A1 (xx) | 1976-12-10 | 1977-12-09 |
Country Status (9)
| Country | Link |
|---|---|
| BE (1) | BE861001A (xx) |
| BR (1) | BR7708213A (xx) |
| DE (1) | DE2754026A1 (xx) |
| FR (1) | FR2373934A1 (xx) |
| IT (1) | IT1088733B (xx) |
| LU (1) | LU78661A1 (xx) |
| NL (1) | NL7713443A (xx) |
| PL (1) | PL202703A1 (xx) |
| SE (1) | SE7714018L (xx) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3831047A1 (de) * | 1988-09-12 | 1990-03-22 | Nixdorf Computer Ag | Schaltungsanordnung zum frequenzselektiven erkennen von tonsignalen |
-
1976
- 1976-12-10 FR FR7637276A patent/FR2373934A1/fr not_active Withdrawn
-
1977
- 1977-11-21 BE BE1008528A patent/BE861001A/xx unknown
- 1977-12-02 IT IT30300/77A patent/IT1088733B/it active
- 1977-12-05 DE DE19772754026 patent/DE2754026A1/de active Pending
- 1977-12-05 NL NL7713443A patent/NL7713443A/xx not_active Application Discontinuation
- 1977-12-07 PL PL20270377A patent/PL202703A1/xx unknown
- 1977-12-09 SE SE7714018A patent/SE7714018L/xx unknown
- 1977-12-09 LU LU78661A patent/LU78661A1/xx unknown
- 1977-12-09 BR BR7708213A patent/BR7708213A/pt unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR7708213A (pt) | 1978-09-05 |
| IT1088733B (it) | 1985-06-10 |
| FR2373934A1 (fr) | 1978-07-07 |
| DE2754026A1 (de) | 1978-06-15 |
| BE861001A (fr) | 1978-05-22 |
| PL202703A1 (pl) | 1978-08-28 |
| NL7713443A (nl) | 1978-06-13 |
| SE7714018L (sv) | 1978-06-11 |