BE523372A - - Google Patents
Info
- Publication number
- BE523372A BE523372A BE523372DA BE523372A BE 523372 A BE523372 A BE 523372A BE 523372D A BE523372D A BE 523372DA BE 523372 A BE523372 A BE 523372A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B23/00—Generation of oscillations periodically swept over a predetermined frequency range
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/22—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being vacuum tube
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Networks Using Active Elements (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US313688A US2745008A (en) | 1952-10-08 | 1952-10-08 | Electronic tone generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE523372A true BE523372A (de) |
Family
ID=23216713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE523372D BE523372A (de) | 1952-10-08 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2745008A (de) |
| BE (1) | BE523372A (de) |
| DE (1) | DE943360C (de) |
| GB (1) | GB734466A (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2832838A (en) * | 1952-07-28 | 1958-04-29 | Gen Dynamics Corp | Electronic ringing apparatus |
| US3109994A (en) * | 1960-06-30 | 1963-11-05 | Automatic Elect Lab | Multivibrator and amplifier powered by pulsating d. c. |
| US3443125A (en) * | 1966-05-26 | 1969-05-06 | Itt | Tone supply gate circuit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1998119A (en) * | 1932-08-19 | 1935-04-16 | Bell Telephone Labor Inc | Frequency changer and circuits therefor |
| US2152016A (en) * | 1935-08-15 | 1939-03-28 | Siemens Und Halske Ag | Modulation |
| BE435784A (de) * | 1938-08-04 | |||
| BE465290A (de) * | 1945-04-30 | |||
| US2541060A (en) * | 1948-05-18 | 1951-02-13 | Faximile Inc | Tone and density compensating device |
| DE820753C (de) * | 1948-10-02 | 1951-11-12 | Siemens & Halske A G | Schaltungsanordnung zur Erzeugung eines zerhackten Wechselstromes |
| BE497732A (de) * | 1949-10-11 |
-
0
- BE BE523372D patent/BE523372A/xx unknown
-
1952
- 1952-10-08 US US313688A patent/US2745008A/en not_active Expired - Lifetime
-
1953
- 1953-09-29 GB GB26734/53A patent/GB734466A/en not_active Expired
- 1953-10-04 DE DEA18905A patent/DE943360C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2745008A (en) | 1956-05-08 |
| DE943360C (de) | 1956-05-17 |
| GB734466A (en) | 1955-08-03 |