INFORMATION TRANSMISSION SYSTEM

• Main Authors: OSAKA KEN, UCHINO SHINJI, IIDA HIROSHI, TANIDA TOSHIO, SATO KIYOSHI, TAKAHASHI SUSUMU
• Format: Patent
• Language: English
• Published: 28.03.1990
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TELEPHONIC COMMUNICATION

PURPOSE:To continue the transmission service and to improve the service performance even if communication at a voice band via a telephone exchange during the transmission of various information such as broadcast, music or data by executing the transmission of telephone information and the transmission of various information in frequency division. CONSTITUTION:When an incoming or outgoing telephone call exists while information is sent from an information source 29 or information is outputted from an information output section 30, the system is operated as shown in the following: That is, in the case of a subscriber call, when the subscriber hooks off a telephone set 24, a DC loop is formed by a coil L3, a subscriber line, a coil L1, a relay of an exchange 21 and coils L2, L4. Thus, a signal generated from the telephone set 24 is not given to information selection control sections 25, 26 because capacitors C3, C4 give a high impedance. In the case of the arrival of a call, the information is not given to the control sections 25, 26 but flows through the exchange 21, the coil L1, the subscriber circuit, the coil L3, the telephone set 24 and the coils L4, L12, then no effect is given to the signal from the information source 29.