Includes details of types and structures of antennae/aerials for communications and broadcast transmission or reception, e.g. monopoles, dipoles, loop and rhombic aerials, waveguide and slot aerials, reflectors, refractors, polarisers and absorbers and aerial arrays.

Also includes arrangements for varying directional pattern e.g. direction control systems, and general antenna details e.g. measuring and testing, aerial parameter measurement, antenna set-up and alignment etc. Isolation, overvoltage and protection arrangements including lightning protection and protection against radiation.

Antenna applications are also included e.g. for land vehicles, marine vessels, aircraft and space vehicles. Details of radio frequency waveguides are included in the Derwent ITP; ‘Radio Frequency Waveguides and Distributed Constant Components’.
ISSN 1463-7537

This Derwent ITP is divided into three sections covering all aspects of television, audio and interactive broadcasting systems, irrespective of media. The information in this Derwent ITP focuses on broadcasting infrastructure and systems aspects, rather than on broadcast receivers.

The television broadcasting section covers TV broadcasting equipment and distribution networks e.g. cable TV networks, CATV, interactive TV, satellite TV and TV studio equipment. See Derwent ITP ‘Image transmission systems’ for details of television systems used for transmitting image information in a non-broadcast environment, such as CCTV systems.

The sound and general broadcasting section covers cable and radio systems of conventional 'one-way' and interactive type, with the emphasis on sound-based broadcasting.

The interactive broadcast systems section covers video, audio/video, audio and information systems for access by entertainment equipment, usually of 'subscription' type, e.g. ‘video-on-demand’, ‘pay-per-view’, ‘pay-per-play’ and ‘communications karaoke’ etc. The Derwent ITP ‘Television and radio receivers’ covers details of broadcast receivers for television and radio signals.
ISSN 1463-7510

Includes encoding equipment and coding schemes and their application to the transmission of data, speech or other information.

Error correction, standard code systems, and code conversion are covered by the 'Coding systems for information transmission' Derwent ITP. Also covered are aspects of secret communications for data transmission and broadcasting. Coding of video signals is covered in the ‘Image Transmission Systems’ Derwent ITP. Image coding is included as part of both the 'Image transmission systems' and 'Coding systems for Information transmission' Derwent ITP.
ISSN 1463-7545

Covers data exchanges and networks e.g. LAN, WAN, ISDN, etc., connections between exchanges and data transmission aspects of the Internet. Testing, monitoring and fault detection and isolation e.g. bridging/disconnecting arrangements for faulty network equipment.

Includes details of networks characterised by both structure e.g. Star, Tree, Bus etc. and communication medium e.g. optical fibre, coaxial cable, radio link etc. Network control hardware and software for control of transmission and reception of messages and/or data across networks.

Computer networks and information transfer across computer networks are covered by the 'Distributed computing' Derwent ITP, although actual data transmission system details will be covered in the 'Data transmission networks' Derwent ITP also, as appropriate.
ISSN 1463-5844

Includes details for synchronising receiver with transmitter using; synchronisation signals, e.g. using cyclically recurring signals, or signals containing no special synchronisation information, e.g. using received signal spectrum.

Secrecy and secret communication e.g. using encryption apparatus using registers and memories for blockwise coding, and systems for user identity and authority.

Includes general transmission equipment i.e. transmitter and receiver apparatus and circuit details, baseband and broadband transmission systems. Error correction, standard code systems, and code conversion are covered by the 'Coding systems for information transmission' Derwent ITP.
ISSN 1463-7421

Includes details of systems used for transmitting image information in a non-broadcast environment, such as CCTV, video conference, video telephone, facsimile etc., and coding systems for more efficient transmission without regard to application.

For image reproduction aspects see Derwent ITP 'Hardcopy image reproduction and line printers'.

Image coding is included as part of both the 'Image transmission systems' and 'Coding systems for Information transmission' Derwent ITPs. See Derwent ITP ‘Broadcasting systems’ for details of television and audio broadcasting systems; e.g. CATV systems.
ISSN 1463-7448

The profile covers video, audio/video, sound-only and information systems and distribution systems for access by entertainment equipment, usually of the ‘subscription’ type.

The profile covers overall system aspects, of interactive broadcasting and home entertainment systems, e.g. video-on-demand and pay-per-view systems. The profile is divided into chapters including; video-on-demand systems which covers systems of a video nature, e.g. pay-per-view, non-video entertainment systems including remote access of entertainment library system e.g. pay-per-play audio systems, information system access and program guide systems, game playing, virtual reality aspects and karaoke, access to financial networks, storage systems and servers, security aspects and access control, including access control and billing arrangements, and systems enabling ‘impulse-buy’ signaling and ‘impulse’ decision to e.g. view programs and associated communications aspects.

The profile also covers details of subscriber systems interacting with the rest of a two-way network, e.g. to request a program, carry out a transaction etc. in e.g. pay-per-view and video-on-demand systems.
ISSN: 1467-5382

The profile covers details of the construction of and components for base and mobile stations e.g. call storage, EM suppression, satellite links, security aspects e.g. encryption, and mobile location determination.

For mobile radio aspects in general see the profile ‘Mobile radio communications and paging’ which includes details of mobile radio equipment in general regardless of application e.g. to telephones.

See also the profile ‘Transmission Systems for Communications’ which includes details of transmission systems used for communications, characterised by the 'type' of transmission medium used, e.g. radio, near-field and line based systems.
ISSN - 1463-5836

Covers walkie-talkie units, near field systems including inductive loop and radiating/leaky cable, mobile transceivers, selective calling for example with duplex, push-to-talk operation, paging (system, apparatus), emergency broadcast receiver.
ISSN 1463-5879

Includes applications involving the transmission of textual, graphical, still and/or moving video pictures which are converted into digital bits and sent down a single communications channel (for example telephone line or compact disc) to a modified television set or personal computer. Includes interactive software, teleconferencing, videophones, telebanking, video-on-demand systems, CD-ROMs etc.
ISSN 1463-5852

Includes equipment and schemes for enabling the multiple use of a transmission path, e.g. systems for the simultaneous or sequential transmission of information for data transmission and broadcasting (e.g. television signals) applications.

Includes multiple access transmission methods and equipment, including spread-spectrum, multiplex, and duplex transmission for applications in both data transmission and broadcasting.
ISSN 1463-743X

Covers standard code systems using optical communications, optical fibre or free-space link for exchanges.
ISSN 1463-5860

Includes details of RF equipment per se. e.g. transceivers, transmitters, receivers etc., regardless of its application, e.g. to mobile/portable phone or base station etc.

General aspects of the design details of radio communications equipment per se. only are included e.g. bandwidth reduction and signal pre-distortion techniques, e.g. time and volume compression or expansion, and single side band including vestigial sideband transmission. Also includes constructional details applicable to radio communications equipment, and stand-by/redundancy systems.

Radio equipment only is included, 'peripheral' aspects of radio communications equipment e.g. aerials and antennas are covered elsewhere. See also Derwent ITP ‘Aerials and Antennas’.
ISSN 1463-7499

Includes materials, components, devices and techniques specifically for RF waveguide technology. Covers transmission lines of the waveguide type e.g. coplanar lines; coaxial lines and microstrips; striplines, wire waveguides, hollow waveguides, dielectric waveguides etc., couplers, combiners and impedance matching, resonators and delay lines etc.

Although waveguides for use at wavelengths overlapping those regarded as optical are included, normal optical waveguides are not covered by this Derwent ITP. Non-RF waveguide' types e.g. optical waveguides, are covered by the 'Optical fibres and light transmission control' Derwent ITP.
ISSN 1463-7529

This profile covers all aspects of satellite communications, including telecommunications and broadcasting aspects. The profile covers; details of satellite telephone equipment, and satellite radio relay systems including cellular communications.
ISSN: 1467-5374

Signalling and warning systems characterised by either means for attracting attention - such as audible or visual signalling - or by the transmission medium employed - e.g. hardwired, optical link, radio link etc. Personal calling aspects such as pagers are also included.
ISSN 1463-7553

Includes transmission systems for measurement or control signals e.g. for remote measurements. Includes general aspects of audio/video remote control, remote control specific to TV receivers and remote control for recording equipment.
ISSN 1463-7480

ncludes telephonic systems combined with other electrical systems, and applications of telephone systems to e.g. alarms, entertainment, video systems, multimedia systems, telephone line data transmission e.g. for electronic funds transfer, and education and information systems etc.

Also covers prepayment telephones and details applicable to telephone systems in general, such as testing equipment (not as part of an exchange), line hybrids, echo cancelling, equalising etc. Interconnection arrangements not involving centralised switching are also included e.g. Intercom and entry-phone systems.
ISSN 1463-7472

Includes selection for telephony and other signal applications, i.e. switching and routing of telephone signals, call metering, automatic and semi-automatic exchanges, exchange control and exchange testing, including maintenance centre systems.

Includes arrangements for providing connection between a main exchange and a sub-exchange or satellite, distribution and queuing arrangements, caller identification and call tracing, and selecting arrangements in which two or more subscriber stations are connected by the same line to an exchange, e.g. party-line systems.

Connecting subscribers via radio or inductive links, in which inductive links are one-way e.g. selective calling systems, or two-way links e.g. mobile radio systems. Selecting arrangements for multiplex systems, e.g. for frequency-division multiplexing, time-division multiplexing etc. are also included.

Automatic and semi-automatic exchange supervision, monitoring and testing, and details of subscriber services provided by automatic exchanges, e.g. call forwarding, transfer, holding and diversion. Systems and arrangements for interconnection between switching centres i.e. inter-exchange connection e.g. for virtual private networks.

Exchanges for routing digital data in non-telephone or unspecified applications are covered in the 'Data transmission networks' Derwent ITP. ISDN exchanges are covered in both the ‘Telephone exchange systems’ and the ‘Data transmission networks’ Derwent ITPs.
ISSN 1463-7413

Covers all aspects of telephone sets per se. including internal and external construction details, i.e. PCB mountings, casings and hand sets, and acoustic constructional details i.e. loudspeaker enclosures external to telephone for e.g. telephone conferencing.

The Derwent ITP also includes details of other equipment found at a subscriber location e.g. subscriber calling services including autodiallers and restricted dialling aspects for i.e. security purposes. Includes cordless and mobile radio telephone aspects.

Telephone apparatus integrated with other equipment to form a single unit is also covered e.g. telephone answering machines and facsimiles etc.
ISSN 1463-7464

Covers all aspects of broadcast receivers for television and radio signals, including teletext, HDTV, RDS, car radios, and digital radio receivers etc.

The Derwent ITP covers all aspects of broadcast receivers including; tuners and tuning circuits, amplifiers, automatic frequency control, band scanning and channel number storage, decoding arrangements etc. for TV and broadcast radio receivers.

Novel details specific to the broadcast system alone are not included. Those aspects are respectively covered by the relevant sections of the 'Broadcasting systems' Derwent ITP which includes sections; 'Television broadcasting systems' and 'Sound and general broadcasting systems'. Communications receivers and general radio receiver circuitry are covered by the Derwent ITP ‘Radio Communications Equipment’ which includes details of RF equipment per se. e.g. transceivers, transmitters, receivers etc., regardless of its application, e.g. to mobile/portable phone
. ISSN 1463-7502

Includes details of transmission systems used for communications, characterised by the 'type' of transmission medium used, e.g. radio, near-field and line based systems.

The Derwent ITP includes a ‘radio and near-field communications’ section which covers radio systems from a mainly non-mobile perspective. Mobile radio systems are covered in detail by the Derwent ITP 'Mobile Radio Communications and Paging'. Aspects of mobile radio which overlap with topics in this Derwent ITP are included here. The subject matter covered by the ‘radio and near-field communications’ section includes: diversity, radio relay, point-to-point systems, equalising, echo cancelling, power control, Doppler shift compensation, network planning, and testing/monitoring.

The Derwent ITP also includes a ‘line and miscellaneous communication systems’ section which covers aspects of line communication such as equalising, echo cancelling, cross-talk suppression, etc., and testing for line and other communication systems in general. Also included are general aspects of PCM communications (non-video), communications via sonic or ultrasonic links, via the ground, etc. PCM video systems are covered in the 'Image transmission systems' Derwent ITP.
ISSN 1463-7588