BE733014A - - Google Patents
Info
- Publication number
- BE733014A BE733014A BE733014DA BE733014A BE 733014 A BE733014 A BE 733014A BE 733014D A BE733014D A BE 733014DA BE 733014 A BE733014 A BE 733014A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/545—Filters comprising resonators of piezoelectric or electrostrictive material including active elements
-
- 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)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US72895868A | 1968-05-14 | 1968-05-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE733014A true BE733014A (de) | 1969-11-14 |
Family
ID=24928961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE733014D BE733014A (de) | 1968-05-14 | 1969-05-14 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3576403A (de) |
| BE (1) | BE733014A (de) |
| CH (1) | CH504145A (de) |
| FR (1) | FR2008503B1 (de) |
| NL (1) | NL6907489A (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4153819A (en) * | 1977-12-19 | 1979-05-08 | Northern Telecom Limited | Telephone tone signalling receiver with up-conversion of frequency of tones controlled by word instructions |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2653194A (en) * | 1949-05-27 | 1953-09-22 | Rca Corp | Selective circuit |
| US2767248A (en) * | 1952-06-27 | 1956-10-16 | Siemens Brothers & Co Ltd | Electrically operated registers |
| NL267564A (de) * | 1960-08-22 | |||
| US3409742A (en) * | 1965-02-11 | 1968-11-05 | Bell Telephone Labor Inc | Data converting buffer circuit |
| US3441682A (en) * | 1965-05-28 | 1969-04-29 | Bell Telephone Labor Inc | Multifrequency signal receiver with compensation for power source variations |
-
1968
- 1968-05-14 US US728958A patent/US3576403A/en not_active Expired - Lifetime
-
1969
- 1969-05-14 FR FR6915616A patent/FR2008503B1/fr not_active Expired
- 1969-05-14 NL NL6907489A patent/NL6907489A/xx unknown
- 1969-05-14 BE BE733014D patent/BE733014A/xx unknown
- 1969-05-14 CH CH734369A patent/CH504145A/de not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2008503A1 (de) | 1970-01-23 |
| US3576403A (en) | 1971-04-27 |
| FR2008503B1 (de) | 1976-10-01 |
| NL6907489A (de) | 1969-11-18 |
| CH504145A (de) | 1971-02-28 |