Aerials for the reception of signals; Aerials for the transmission of signals; Antennas for receiving audio signals; Antennas for receiving television signals; Apparatus for broadcasting audio signals; Apparatus for broadcasting visual signals; Apparatus for decoding encoded signals; Apparatus for digital signal processing; Apparatus for displaying picture signals; Apparatus for electrical signal transmission; Apparatus for monitoring picture quality parameters of video signals; Apparatus for optical signal transmission; Apparatus for optical signalization; Apparatus for processing audio signals; Apparatus for processing digital video signals; Apparatus for processing video signals; Apparatus for receiving satellite broadcast signals; Apparatus for recording audio signals; Apparatus for recording television signals on discs; Apparatus for recording visual signals; Apparatus for signalization in industry; Apparatus for signalling; Apparatus for the remote control of signals; Apparatus for the transmission of electrical signals; Apparatus for transmitting audio signals; Apparatus for transmitting electronic signals; Apparatus for transmitting radio signals by cable; Apparatus for transmitting signals; Apparatus for transmitting television signals via satellite; Apparatus for use in detecting signal levels; Audio signal level controlling apparatus; Audio signal processing apparatus; Bells, signal; Cable management installations for data signal transmission; Cables for optical signal transmission; Cables for signal transmission systems; Cabling for transmitting signals; Cabling for transmitting signals over mains wiring systems; Cartridge tapes for the recordal of signals; Coded signalling apparatus; Control apparatus for audio signals; Converters being telecommunications apparatus for television signals; Converters for analogue signals; Converters for digital signals; Digital audio signal processors; Digital signal processing apparatus; Electric amplifiers (signal); Electric apparatus for the exchange of digital signals; Electric apparatus for the transmission of analogue signals; Electric apparatus for the transmission of digital signals; Electrical amplifiers for sound signals; Electrical apparatus for converting signals into visual information; Microwave antenna for the reception of television signals; Optical filters capable of controlling transmission rate of signals; Optical signalling apparatus; Process signal converters; Radio signal antennae; Radio signal tuners; Receivers for frequency modulated signals; Satellite signal receiving antennae; Satellite television signal descramblers; Satellite television signal scramblers; Satellites for signal transmission; Security apparatus for processing audio signals; Security apparatus for processing video and/or audio signals; Security apparatus for receiving audio signals; Security apparatus for receiving video signals; Security apparatus for storing audio signals; Security apparatus for storing video signals; Security apparatus for transmitting audio signals; Security apparatus for transmitting video signals; Set-top boxes (digital signal receivers); Signal amplifiers; Signal attenuation apparatus; Signal convertors; Signal couplers; Signal delay apparatus; Signal generators; Signal multiplexers; Signal processing apparatus; Signal processing apparatus for remote diagnosis; Signal processors; Signal processors for audio speakers; Signal splitters; Signal transmission apparatus; Signal transmitters; Signal transmitting apparatus utilising optical fibres; Signal tuners; Stereo signal generator apparatus; Telecommunications apparatus for use with analogue signals; Telecommunications apparatus for use with digital signals; Television signal amplifiers; Television signal transmission apparatus; Transmitters for the transmission of electronic signals; Transmitters of electronic signals; Video signalling apparatus; Voice signalling apparatus for use with line telephone systems; Voice signalling apparatus for use with mobile radio systems