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Priority to DE19752537802priorityCriticalpatent/DE2537802B1/de
Publication of DE2537802B1publicationCriticalpatent/DE2537802B1/de
Publication of DE2537802A1publicationCriticalpatent/DE2537802A1/de
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
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Engineering & Computer Science
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Signal Processing
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Digital Transmission Methods That Use Modulated Carrier Waves
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DE197525378021975-08-251975-08-25Schaltungsanordnung zur erzeugung von aus mehreren sinussignalen unterschiedlicher frequenz zusammengesetzten codezeichen in fernmelde-, insbesondere fernsprechanlagen
WithdrawnDE2537802B1
(de)
Schaltungsanordnung zur erzeugung von aus mehreren sinussignalen unterschiedlicher frequenz zusammengesetzten codezeichen in fernmelde-, insbesondere fernsprechanlagen
Schaltungsanordnung zur erzeugung von aus mehreren sinussignalen unterschiedlicher frequenz zusammengesetzten codezeichen in fernmelde-, insbesondere fernsprechanlagen
Schaltungsanordnung zur erzeugung von aus mehreren sinussignalen unterschiedlicher frequenz zusammengesetzten codezeichen in fernmelde-, insbesondere fernsprechanlagen
