Abstract: A writing pad is used for displaying information, in which the displayed information can be controlled in accordance with a corresponding control information controlling contents of the displayed information. A communicating unit is used for communicating the displayed information and the control information to another communication terminal apparatus. A mode selecting unit is used for selecting one of a plurality of modes, wherein the displayed information corresponding to an image displayed through the writing pad and the control information are communicated to the other communication terminal apparatus in a first mode of the plurality of modes, and wherein document information corresponding to a document is communicated to the other communication terminal apparatus in a second mode of the plurality of modes.

Abstract: A first picture-display apparatus comprising: a first display device having a screen for and displaying pictures on the screen so that the screen is refreshed at frequent predetermined screen refreshing intervals; a first display-device control device for outputting the displaying data to the first display device at the frequent predetermined screen refreshing intervals; a storing device for storing the displaying data; a displaying-data control device for reading the displaying data stored in the storing device at frequent predetermined screen renewal intervals, the displaying-data control device then outputting the read displaying data to the first display-device control device. The first picture-display apparatus outputs the displaying data to at least one second picture-display apparatus at the frequent predetermined screen renewal intervals.

Abstract: The invention is a data multiplexing and separation method. It takes a plural number of timing data from memory that stores the plural number of timing data so as to detect bit positions on frame data signals on which bits respectively affiliated with a plural number of data are arranged. The plural number of timing data is used as the basis to arrange data to the frame data signal by successively arranging bits respectively affiliated with the plural number of data to the frame data signal so that the plural number of data is multiplexed to the frame data signals. And also it extracts a plural number of data from frame data signals by successively taking bits respectively affiliated with multiplexed the plural number of data from the frame data signals on the basis of the plural number of timing signals, and extracts a plural number of the multiplexed data from the frame data signals.

Abstract: A phase mask for use in a holographic apparatus comprising a combination of phase mask and data mask and being so devised that an illuminant beam transmitting these masks is irradiated on a Fourier transform plane together with a reference beam coherent with said illuminant bean, said phase mask being composed of a transparent plate and random undulations formed on the surface of said transparent plate by coating a solution of high molecular weight compound by means of a spin coater.