SE376139B - - Google Patents
Info
- Publication number
- SE376139B SE376139B SE7108599A SE859971A SE376139B SE 376139 B SE376139 B SE 376139B SE 7108599 A SE7108599 A SE 7108599A SE 859971 A SE859971 A SE 859971A SE 376139 B SE376139 B SE 376139B
- Authority
- SE
- Sweden
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)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Dc Digital Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
- Measurement Of Current Or Voltage (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Electronic Switches (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP45057734A JPS5138484B1 (fr) | 1970-07-03 | 1970-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SE376139B true SE376139B (fr) | 1975-05-05 |
Family
ID=13064134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE7108599A SE376139B (fr) | 1970-07-03 | 1971-07-02 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3701857A (fr) |
| JP (1) | JPS5138484B1 (fr) |
| BE (1) | BE769428A (fr) |
| DE (1) | DE2130975C3 (fr) |
| GB (1) | GB1353199A (fr) |
| SE (1) | SE376139B (fr) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA976675A (en) * | 1972-10-16 | 1975-10-21 | Microsystems International Limited | Dual tone receiver |
| US3875347A (en) * | 1973-10-01 | 1975-04-01 | Gte Automatic Electric Lab Inc | Multifrequency signal receiver |
| US3930127A (en) * | 1974-01-18 | 1975-12-30 | Baldwin Electronics Inc | Tone detector |
| JPS5543677B2 (fr) * | 1974-05-15 | 1980-11-07 | ||
| JPS5242308A (en) * | 1975-10-01 | 1977-04-01 | Iwatsu Electric Co Ltd | Multiplex frequency signal receiver |
| US4636590A (en) * | 1984-12-31 | 1987-01-13 | Computer Security Corporation | Method and apparatus for converting frequency signals representing characters to binary code |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL267564A (fr) * | 1960-08-22 | |||
| US3288940A (en) * | 1963-10-24 | 1966-11-29 | Automatic Elect Lab | Multifrequency signal receiver |
| US3539731A (en) * | 1968-11-05 | 1970-11-10 | Bell Telephone Labor Inc | Multifrequency signal receiver |
-
1970
- 1970-07-03 JP JP45057734A patent/JPS5138484B1/ja active Pending
-
1971
- 1971-06-22 DE DE2130975A patent/DE2130975C3/de not_active Expired
- 1971-06-28 US US157361A patent/US3701857A/en not_active Expired - Lifetime
- 1971-06-30 GB GB3076471A patent/GB1353199A/en not_active Expired
- 1971-07-02 SE SE7108599A patent/SE376139B/xx unknown
- 1971-07-02 BE BE769428A patent/BE769428A/fr unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB1353199A (en) | 1974-05-15 |
| JPS5138484B1 (fr) | 1976-10-22 |
| DE2130975B2 (de) | 1979-03-01 |
| US3701857A (en) | 1972-10-31 |
| BE769428A (fr) | 1971-11-16 |
| DE2130975C3 (de) | 1979-10-25 |
| DE2130975A1 (de) | 1972-01-05 |