DE2505955C3 - Schaltung für eine Mehrfrequenz-Tastwahl-Fernsprecher - Google Patents
Schaltung für eine Mehrfrequenz-Tastwahl-FernsprecherInfo
- Publication number
- DE2505955C3 DE2505955C3 DE2505955A DE2505955A DE2505955C3 DE 2505955 C3 DE2505955 C3 DE 2505955C3 DE 2505955 A DE2505955 A DE 2505955A DE 2505955 A DE2505955 A DE 2505955A DE 2505955 C3 DE2505955 C3 DE 2505955C3
- Authority
- DE
- Germany
- Prior art keywords
- networks
- circuit
- output
- current source
- network
- Prior art date
- 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
- 239000004020 conductor Substances 0.000 description 18
- 230000005236 sound signal Effects 0.000 description 10
- 230000011664 signaling Effects 0.000 description 8
- 230000000670 limiting effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 241000283973 Oryctolagus cuniculus Species 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 241000283690 Bos taurus Species 0.000 description 1
- 241000764238 Isis Species 0.000 description 1
- 230000027455 binding Effects 0.000 description 1
- 238000009739 binding Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/26—Devices for calling a subscriber
- H04M1/30—Devices which can set up and transmit only one digit at a time
- H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Telephonic Communication Services (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7402574A NL7402574A (nl) | 1974-02-26 | 1974-02-26 | Schakeling voor een toondruktoetskeuzetelefoon- toestel. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2505955A1 DE2505955A1 (de) | 1975-08-28 |
| DE2505955B2 DE2505955B2 (de) | 1980-08-14 |
| DE2505955C3 true DE2505955C3 (de) | 1981-06-04 |
Family
ID=19820838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2505955A Expired DE2505955C3 (de) | 1974-02-26 | 1975-02-13 | Schaltung für eine Mehrfrequenz-Tastwahl-Fernsprecher |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US3978295A (en, 2012) |
| JP (1) | JPS547644B2 (en, 2012) |
| BE (1) | BE825893A (en, 2012) |
| CA (1) | CA1015079A (en, 2012) |
| DE (1) | DE2505955C3 (en, 2012) |
| DK (1) | DK141979B (en, 2012) |
| FR (1) | FR2262457B1 (en, 2012) |
| GB (1) | GB1452254A (en, 2012) |
| NL (1) | NL7402574A (en, 2012) |
| SE (1) | SE399169B (en, 2012) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196318A (en) * | 1978-09-29 | 1980-04-01 | Bell Telephone Laboratories, Incorporated | Electronically-switched multifrequency generator for providing tone signaling |
| US4352958A (en) * | 1979-12-13 | 1982-10-05 | Bell Telephone Laboratories, Incorporated | Electronically-switched multifrequency generator with transducer control |
| US4472601A (en) * | 1982-07-14 | 1984-09-18 | Rca Corporation | Control circuit for telephone receiver and transmitter |
| US6529450B1 (en) * | 1998-08-03 | 2003-03-04 | Dictaphone Corporation | Hand microphone interfaced to game controller port of personal computer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE25507E (en) * | 1959-12-16 | 1964-01-07 | Frequency - cps | |
| DE1201417B (de) * | 1964-07-10 | 1965-09-23 | Standard Elektrik Lorenz Ag | Tonfrequentes Tastwahlverfahren ohne Gleichstrom-Wahlbegleitzeichen in Fernmelde-, insbesondere Fernsprechanlagen und Schaltungsanordnung zur Durchfuehrung des Verfahrens |
| US3424870A (en) * | 1965-09-14 | 1969-01-28 | Bell Telephone Labor Inc | Multifrequency signal generator for tone-dialed telephones |
| BE693127A (en, 2012) * | 1967-01-25 | 1967-07-25 | ||
| CA861632A (en) * | 1969-03-19 | 1971-01-19 | Northern Electric Company Limited | Pushbutton dial telephone set |
| US3665489A (en) * | 1969-06-06 | 1972-05-23 | Ericsson Telefon Ab L M | Telephone instrument for voice frequency choice of number |
-
1974
- 1974-02-26 NL NL7402574A patent/NL7402574A/xx not_active Application Discontinuation
-
1975
- 1975-02-11 US US05/548,996 patent/US3978295A/en not_active Expired - Lifetime
- 1975-02-13 DE DE2505955A patent/DE2505955C3/de not_active Expired
- 1975-02-21 GB GB735475A patent/GB1452254A/en not_active Expired
- 1975-02-21 SE SE7501942A patent/SE399169B/xx not_active IP Right Cessation
- 1975-02-21 DK DK67775AA patent/DK141979B/da unknown
- 1975-02-21 CA CA220,552A patent/CA1015079A/en not_active Expired
- 1975-02-24 BE BE153665A patent/BE825893A/xx unknown
- 1975-02-24 JP JP2196375A patent/JPS547644B2/ja not_active Expired
- 1975-02-26 FR FR7506016A patent/FR2262457B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE7501942L (en, 2012) | 1975-08-27 |
| DK141979B (da) | 1980-07-28 |
| GB1452254A (en) | 1976-10-13 |
| DK67775A (en, 2012) | 1975-10-27 |
| JPS547644B2 (en, 2012) | 1979-04-09 |
| FR2262457B1 (en, 2012) | 1978-02-03 |
| BE825893A (fr) | 1975-08-25 |
| FR2262457A1 (en, 2012) | 1975-09-19 |
| JPS50120506A (en, 2012) | 1975-09-20 |
| DE2505955B2 (de) | 1980-08-14 |
| DK141979C (en, 2012) | 1980-12-08 |
| SE399169B (sv) | 1978-01-30 |
| US3978295A (en) | 1976-08-31 |
| DE2505955A1 (de) | 1975-08-28 |
| NL7402574A (nl) | 1975-08-28 |
| CA1015079A (en) | 1977-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OD | Request for examination | ||
| C3 | Grant after two publication steps (3rd publication) | ||
| 8339 | Ceased/non-payment of the annual fee |