Priority date (The priority date 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 date listed.)
Publication of BE363945ApublicationCriticalpatent/BE363945A/xx
H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04B—TRANSMISSION
H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
H04B1/40—Circuits
H04B1/44—Transmit/receive switching
H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals