Apparatus for electronic image transmission; Apparatus for optical signal transmission; Apparatus for remote data transmission; Apparatus for sound transmission; Apparatus for television transmission; Apparatus for the transmission of data; Apparatus for the transmission of images; Apparatus for the transmission of sound; Apparatus for the transmission of sound or images; Apparatus for transmission via satellites; Apparatus for use in high-frequency transmission; Data transmission apparatus; Digital optical transmission apparatus; Digital optical transmission instruments; Direct broadcasting apparatus for the transmission of data; Direct broadcasting apparatus for the transmission of programmes; High speed data transmission apparatus; Portable apparatus for receiving satellite transmissions; Satellites for signal transmission; Signal transmission apparatus; Television signal transmission apparatus; Media for the reproduction of images; Media for the reproduction of sound