BE621906A - - Google Patents
Info
- Publication number
- BE621906A BE621906A BE621906DA BE621906A BE 621906 A BE621906 A BE 621906A BE 621906D A BE621906D A BE 621906DA BE 621906 A BE621906 A BE 621906A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
-
- 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)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEST18261A DE1141348B (de) | 1961-08-30 | 1961-08-30 | Empfangseinrichtung fuer ein tonfrequentes Code-Signalverfahren mit mehreren Signalfrequenzgruppen in Fernsprechvermittlungsanlagen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE621906A true BE621906A (en:Method) |
Family
ID=7457785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE621906D BE621906A (en:Method) | 1961-08-30 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE621906A (en:Method) |
| CH (1) | CH402965A (en:Method) |
| DE (1) | DE1141348B (en:Method) |
| NL (2) | NL143398B (en:Method) |
-
0
- BE BE621906D patent/BE621906A/xx unknown
- NL NL282657D patent/NL282657A/xx unknown
-
1961
- 1961-08-30 DE DEST18261A patent/DE1141348B/de active Pending
-
1962
- 1962-08-23 CH CH1005062A patent/CH402965A/de unknown
- 1962-08-30 NL NL282657A patent/NL143398B/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL143398B (nl) | 1974-09-16 |
| CH402965A (de) | 1965-11-30 |
| NL282657A (en:Method) | |
| DE1141348B (de) | 1962-12-20 |