FR2153943A5 - - Google Patents
Info
- Publication number
- FR2153943A5 FR2153943A5 FR7232114A FR7232114A FR2153943A5 FR 2153943 A5 FR2153943 A5 FR 2153943A5 FR 7232114 A FR7232114 A FR 7232114A FR 7232114 A FR7232114 A FR 7232114A FR 2153943 A5 FR2153943 A5 FR 2153943A5
- 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
- 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)
- Monitoring And Testing Of Exchanges (AREA)
- Interface Circuits In Exchanges (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19712145886 DE2145886C2 (en) | 1971-09-14 | 1971-09-14 | Voice-protected, frequency-selective signal receiver for telecommunications, in particular telephone systems |
| DE19712156123 DE2156123C2 (en) | 1971-11-11 | 1971-11-11 | Frequency-selective character receiver for telecommunications, in particular telephone systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2153943A5 true FR2153943A5 (en) | 1973-05-04 |
Family
ID=25761724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR7232114A Expired FR2153943A5 (en) | 1971-09-14 | 1972-09-11 |
Country Status (9)
| Country | Link |
|---|---|
| AT (1) | AT328516B (en) |
| BE (1) | BE788813A (en) |
| CH (1) | CH545569A (en) |
| FR (1) | FR2153943A5 (en) |
| GB (1) | GB1402119A (en) |
| IT (1) | IT967367B (en) |
| LU (1) | LU66057A1 (en) |
| NL (1) | NL7212486A (en) |
| SE (1) | SE397461B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4216463A (en) * | 1978-08-10 | 1980-08-05 | Motorola, Inc. | Programmable digital tone detector |
-
0
- BE BE788813D patent/BE788813A/en unknown
-
1972
- 1972-08-17 AT AT713372A patent/AT328516B/en not_active IP Right Cessation
- 1972-08-21 CH CH545569D patent/CH545569A/xx not_active IP Right Cessation
- 1972-09-11 FR FR7232114A patent/FR2153943A5/fr not_active Expired
- 1972-09-12 IT IT2907772A patent/IT967367B/en active
- 1972-09-12 LU LU66057D patent/LU66057A1/xx unknown
- 1972-09-13 SE SE1182472A patent/SE397461B/en unknown
- 1972-09-13 GB GB4245972A patent/GB1402119A/en not_active Expired
- 1972-09-14 NL NL7212486A patent/NL7212486A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| AT328516B (en) | 1976-03-25 |
| CH545569A (en) | 1974-01-31 |
| LU66057A1 (en) | 1973-01-17 |
| NL7212486A (en) | 1973-03-16 |
| SE397461B (en) | 1977-10-31 |
| GB1402119A (en) | 1975-08-06 |
| ATA713372A (en) | 1975-06-15 |
| IT967367B (en) | 1974-02-28 |
| BE788813A (en) | 1973-03-14 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |