Subscriber set for video telephony

摘要

The subscriber set has a video camera (K), a projection tube (P) and a screen (S) onto which the image is projected. The screen (S) is matt for the projection and transparent for the video camera (K). This dependence of the transparency of the screen (S) on the direction of the light rays can be a property of the material of the screen or be achieved by electrical control. <IMAGE>