BE655220A - - Google Patents
Info
- Publication number
- BE655220A BE655220A BE655220DA BE655220A BE 655220 A BE655220 A BE 655220A BE 655220D A BE655220D A BE 655220DA BE 655220 A BE655220 A BE 655220A
- Authority
- BE
- Belgium
Links
Classifications
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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
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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
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system
-
- 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
- H04Q1/4535—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 with an additional signal transmitted for voice protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEST17623A DE1133772B (de) | 1961-03-25 | 1961-03-25 | Verfahren und Schaltungsanordnung zur tonfrequenten Tastwahl in Fernsprechanlagen |
DEST21276A DE1192276B (de) | 1963-11-05 | 1963-11-05 | Signalverfahren fuer Tastwahl mit Tonfrequenz |
Publications (1)
Publication Number | Publication Date |
---|---|
BE655220A true BE655220A (bs) | 1965-05-04 |
Family
ID=36964918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE655220D BE655220A (bs) | 1961-03-25 | 1964-11-04 |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE655220A (bs) |
FR (1) | FR1323798A (bs) |
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1962
- 1962-03-26 FR FR892193A patent/FR1323798A/fr not_active Expired
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1964
- 1964-11-04 BE BE655220D patent/BE655220A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
FR1323798A (fr) | 1963-04-12 |