FR2487611B1 - VOICE FREQUENCY KEYBOARD INTERFACE CIRCUIT - Google Patents
VOICE FREQUENCY KEYBOARD INTERFACE CIRCUITInfo
- Publication number
- FR2487611B1 FR2487611B1 FR8016112A FR8016112A FR2487611B1 FR 2487611 B1 FR2487611 B1 FR 2487611B1 FR 8016112 A FR8016112 A FR 8016112A FR 8016112 A FR8016112 A FR 8016112A FR 2487611 B1 FR2487611 B1 FR 2487611B1
- Authority
- FR
- France
- Prior art keywords
- interface circuit
- keyboard interface
- voice frequency
- frequency keyboard
- voice
- 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
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)
- Devices For Supply Of Signal Current (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8016112A FR2487611B1 (en) | 1980-07-22 | 1980-07-22 | VOICE FREQUENCY KEYBOARD INTERFACE CIRCUIT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8016112A FR2487611B1 (en) | 1980-07-22 | 1980-07-22 | VOICE FREQUENCY KEYBOARD INTERFACE CIRCUIT |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2487611A1 FR2487611A1 (en) | 1982-01-29 |
FR2487611B1 true FR2487611B1 (en) | 1987-10-30 |
Family
ID=9244387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8016112A Expired FR2487611B1 (en) | 1980-07-22 | 1980-07-22 | VOICE FREQUENCY KEYBOARD INTERFACE CIRCUIT |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2487611B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2525056A1 (en) * | 1982-04-09 | 1983-10-14 | Telephonie Ind Commerciale | LINE-OFF PLUG-OUT DEVICE FOR A TELEPHONE STATION COMPRISING A MICROPROCESSOR |
FR2529419A1 (en) * | 1982-06-29 | 1983-12-30 | Thomson Csf Mat Tel | UNIVERSAL TELEPHONE STATION WITH CUSTOMIZABLE FUNCTION KEYS |
US20040145358A1 (en) * | 2001-04-19 | 2004-07-29 | Rogers Terrence Edwards | Method and apparatus for minimizing power dissipation in series connected voltage regulators |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1056970A (en) * | 1977-01-10 | 1979-06-19 | Northern Telecom Limited | Electronic network for telephone set |
-
1980
- 1980-07-22 FR FR8016112A patent/FR2487611B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2487611A1 (en) | 1982-01-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |