Abstract: Disclosed is an audio signal transmission system that allows all users to confirm the overall system operation and actively select various system services. The audio signal transmission system, which allows a plurality of terminal devices to share channels that are allocated to various sound sources, includes a terminal device corresponding to one sound source; a material information storage device for storing material information constituting a virtual world; a symbol position storage device for storing a symbol moving in the virtual world and the position information about the symbol; a relationship storage device for storing the relationship between a symbol and a terminal device; a symbol move control device for controlling the move of a symbol in accordance with the associated control data received from each terminal device; and an image display device for displaying an image combination of various symbols and the virtual world as a shared screen.

Abstract: Individual training stations are able to record and play back a student's own pronunciations as well as to reproduce the recorded pronunciations of the fellow students and of prerecorded voice teaching aids by means of a digital memory and controller.

Abstract: A group education system including a first memory for storing an original sentence group, a second memory for storing a starting address, an end address of a sentence block of an original sentence group stored in the first memory, a control circuit for controlling the selection of a playback mode and the reading order of the sentence blocks of the original sentence group stored in the first memory and the change of the pause times thereof and a third memory for storing the reading order, the starting address, the end address and the altered pause times of the selected sentence block under the control of the control circuit. Accordingly, it becomes possible to form with ease a sentence group in which the playback mode and the reproducing order of the selected sentence block are selected and the pause times between the sentence blocks are changed.