BE843837A - Circuit d'exploration par dephasage d'un clavier a multifrequence - Google Patents
Circuit d'exploration par dephasage d'un clavier a multifrequenceInfo
- Publication number
- BE843837A BE843837A BE168679A BE168679A BE843837A BE 843837 A BE843837 A BE 843837A BE 168679 A BE168679 A BE 168679A BE 168679 A BE168679 A BE 168679A BE 843837 A BE843837 A BE 843837A
- Authority
- BE
- Belgium
- Prior art keywords
- phasing
- multifrequency
- keyboard
- exploration circuit
- exploration
- Prior art date
Links
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
- H04M1/505—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 signals generated in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Input From Keyboards Or The Like (AREA)
- Telephone Set Structure (AREA)
- Liquid Crystal Display Device Control (AREA)
- Electronic Switches (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/594,819 US4007459A (en) | 1975-07-10 | 1975-07-10 | Multitone pushbutton dial phase shift scanning circuitry |
Publications (1)
Publication Number | Publication Date |
---|---|
BE843837A true BE843837A (fr) | 1976-11-03 |
Family
ID=24380535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE168679A BE843837A (fr) | 1975-07-10 | 1976-07-06 | Circuit d'exploration par dephasage d'un clavier a multifrequence |
Country Status (11)
Country | Link |
---|---|
US (1) | US4007459A (de) |
JP (1) | JPS5289403A (de) |
BE (1) | BE843837A (de) |
CA (1) | CA1049670A (de) |
DE (1) | DE2630729C3 (de) |
ES (1) | ES449725A1 (de) |
FR (1) | FR2317844A1 (de) |
GB (1) | GB1526463A (de) |
IT (1) | IT1067420B (de) |
NL (1) | NL174419C (de) |
SE (1) | SE409272B (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4087638A (en) * | 1976-10-01 | 1978-05-02 | Telaris Telecommunications Inc. | DTMF Communication system |
US4132871A (en) * | 1977-06-22 | 1979-01-02 | Fairchild Camera And Instrument Corporation | Digitally synthesized multi-frequency signal generator |
FR2470497A1 (fr) * | 1979-11-23 | 1981-05-29 | Cit Alcatel | Clavier d'appel de poste telephonique automatique utilisant des techniques analogiques |
JPS60136461A (ja) * | 1983-12-26 | 1985-07-19 | Toshiba Corp | Dtmf信号発生装置 |
JPS60136460A (ja) * | 1983-12-26 | 1985-07-19 | Toshiba Corp | Dtmf信号発生装置 |
JPS60136459A (ja) * | 1983-12-26 | 1985-07-19 | Toshiba Corp | Dtmf信号発生装置 |
US4633183A (en) * | 1985-02-28 | 1986-12-30 | Hayes Microcomputer Products, Inc. | Constant resolution frequency synthesizer |
US5036321A (en) * | 1989-08-31 | 1991-07-30 | Otis Elevator Company | Capacitive sensing, solid state touch button system |
US6104320A (en) * | 1998-01-23 | 2000-08-15 | Holtek Semiconductor Inc. | Input detection circuit for a matrix keyboard |
US6259435B1 (en) * | 1998-08-25 | 2001-07-10 | Compaq Computer Corp. | Obfuscated keyboard scan |
RU2220449C1 (ru) | 2002-12-19 | 2003-12-27 | Акционерное общество закрытого типа "ЛИТЭКС" | Способ маркирования изделий с помощью набора меток и метка для маркирования |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3293450A (en) * | 1963-09-16 | 1966-12-20 | Beckman Instruments Inc | Transfer circuit having wide range antilogarithm response |
US3483553A (en) * | 1967-06-08 | 1969-12-09 | Scantlin Electronics Inc | Keyboard input system |
US3721976A (en) * | 1971-02-01 | 1973-03-20 | Omron Syst Inc | Keyboard coding and interlock system |
US3820028A (en) * | 1971-08-27 | 1974-06-25 | J Thomas | Digital tone signal generator |
US3904887A (en) * | 1974-03-25 | 1975-09-09 | Bell Telephone Labor Inc | Snap-action pushbutton switch |
-
1975
- 1975-07-10 US US05/594,819 patent/US4007459A/en not_active Expired - Lifetime
-
1976
- 1976-05-17 CA CA252,708A patent/CA1049670A/en not_active Expired
- 1976-07-06 BE BE168679A patent/BE843837A/xx not_active IP Right Cessation
- 1976-07-06 FR FR7620627A patent/FR2317844A1/fr active Granted
- 1976-07-07 SE SE7607775A patent/SE409272B/xx not_active IP Right Cessation
- 1976-07-08 NL NLAANVRAGE7607569,A patent/NL174419C/xx not_active IP Right Cessation
- 1976-07-08 DE DE2630729A patent/DE2630729C3/de not_active Expired
- 1976-07-09 GB GB28761/76A patent/GB1526463A/en not_active Expired
- 1976-07-09 ES ES449725A patent/ES449725A1/es not_active Expired
- 1976-07-09 IT IT25193/76A patent/IT1067420B/it active
- 1976-07-09 JP JP8110876A patent/JPS5289403A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE2630729C3 (de) | 1980-03-20 |
NL174419B (nl) | 1984-01-02 |
FR2317844A1 (fr) | 1977-02-04 |
ES449725A1 (es) | 1977-09-16 |
NL7607569A (nl) | 1977-01-12 |
IT1067420B (it) | 1985-03-16 |
SE7607775L (sv) | 1977-01-11 |
SE409272B (sv) | 1979-08-06 |
NL174419C (nl) | 1984-06-01 |
JPS5289403A (en) | 1977-07-27 |
GB1526463A (en) | 1978-09-27 |
DE2630729B2 (de) | 1979-07-12 |
CA1049670A (en) | 1979-02-27 |
DE2630729A1 (de) | 1977-01-20 |
US4007459A (en) | 1977-02-08 |
FR2317844B1 (de) | 1980-11-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RE | Patent lapsed |
Owner name: WESTERN ELECTRIC CY INC. Effective date: 19870731 |