FR2368843B1 - - Google Patents
Info
- Publication number
- FR2368843B1 FR2368843B1 FR7631827A FR7631827A FR2368843B1 FR 2368843 B1 FR2368843 B1 FR 2368843B1 FR 7631827 A FR7631827 A FR 7631827A FR 7631827 A FR7631827 A FR 7631827A FR 2368843 B1 FR2368843 B1 FR 2368843B1
- Authority
- FR
- France
- 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
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- 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
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- 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)
- Computer Networks & Wireless Communication (AREA)
- Meter Arrangements (AREA)
- Interface Circuits In Exchanges (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7631827A FR2368843A1 (fr) | 1976-10-22 | 1976-10-22 | Emetteur de signaux multifrequences |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7631827A FR2368843A1 (fr) | 1976-10-22 | 1976-10-22 | Emetteur de signaux multifrequences |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2368843A1 FR2368843A1 (fr) | 1978-05-19 |
FR2368843B1 true FR2368843B1 (el) | 1982-07-23 |
Family
ID=9179084
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7631827A Granted FR2368843A1 (fr) | 1976-10-22 | 1976-10-22 | Emetteur de signaux multifrequences |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2368843A1 (el) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8301366A (nl) * | 1983-04-19 | 1984-11-16 | Philips Nv | Transmissieschakeling voor een dtmf-telefoontoestel. |
EP0147791B1 (en) * | 1983-12-26 | 1990-08-29 | Kabushiki Kaisha Toshiba | Dual-tone multiple-frequency-signal generating apparatus |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3946164A (en) * | 1974-05-28 | 1976-03-23 | Gte Automatic Electric Laboratories Incorporated | Precise tone signal generator |
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1976
- 1976-10-22 FR FR7631827A patent/FR2368843A1/fr active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2368843A1 (fr) | 1978-05-19 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
TP | Transmission of property |