Includes audio signal mixing, stereo- and quadraphonic systems, audio amplifiers, tone and volume control, balancing, digital speech and sound signal processing. Includes computer processing arrangements for speech and audio.

Covers audio signal processing and mixing in e.g. sound studios, and for general applications i.e. dynamic and static recording. Audio noise reduction, signal compression and expansion and sound mixing details. Audio amplifier details for TV and broadcast radio receivers, and details of amplifiers used in hearing aids. Analysis and synthesis of sound waves, i.e. in speech analysis and synthesis applications, general speech signal processing and representation, and noise cancelling arrangements i.e. using anti-phase sound
. ISSN 1463-7715

General details of audio and video recording and reproduction equipment e.g. tape transports, disc drives, head positioning etc., and also editing, indexing, control and monitoring arrangements, record carrier cases and equipment housings.

Dynamic recording using other technologies is covered under the Derwent ITP 'Components and systems for dynamic recording'. See also Derwent ITPs ‘Video and Audio Recording and Reproduction’ and ‘Data Recording and Reproduction Systems’.
ISSN 1463-7723

Includes general details of recording and reproduction equipment, not specifically for AV, e.g. tape transports, disc drives, head positioning etc. The Derwent ITP also covers editing, indexing, control and monitoring arrangements, record carrier cases and equipment housings.

Coverage also includes; signal processing in general for dynamic recording, library storage systems, and recording by technologies other than magnetic, optical, or magneto-optical - e.g. capacitive or tunnel current recording.

See also the Derwent ITP ‘Components and Systems for Dynamic AV recording’ for general details specific to audio and video recording and reproduction equipment.
ISSN 1463-7731

Includes details of dynamic recording and reproduction equipment characterised by technology, e.g. reading and writing data using magnetic methods.

The Derwent ITP covers: record carriers and their casings, heads, head positioning, and carrier drive aspects, and also recording techniques, circuits, and interfacing. Includes recording and erasing, read/write circuits and methods, copying and prevention of copying, and interfacing circuits, all specific to magnetic recording. Dynamic recording using other technologies is covered under the Derwent ITP 'Components and systems for dynamic recording'.
ISSN 1463-774X

Details of dynamic recording and reproduction equipment characterised by technology, e.g. reading and writing data using magneto-optical methods. The Derwent ITP covers; record carriers and their casings, heads, head positioning and carrier drive aspects, and also recording techniques, circuits, and interfacing. Includes recording and erasing, read/write circuits and methods, copying and prevention of copying, and interfacing circuits, all specific to magneto-optical recording.

Dynamic recording using other technologies is covered under the Derwent ITP 'Components and systems for dynamic recording'.
ISSN 1463-7766

Includes details of dynamic recording and reproduction equipment characterised by technology, e.g. reading and writing data using optical methods. The Derwent ITP covers: record carriers and their casings, heads, head positioning and carrier drive aspects, and also recording techniques, circuits, and interfacing. Includes recording and erasing, read/write circuits and methods, copying and prevention of copying, and interfacing circuits, all specific to optical recording.

Dynamic recording using other technologies is covered under the Derwent ITP 'Components and systems for dynamic recording'.
ISSN 1463-7758

Includes image display tubes e.g. CRTs and electron gun tubes, and fluorescent display tubes for display and imaging applications e.g. in video cameras. Display arrangements for TV receivers including CRT, LCD and plasma TV display aspects. CRT control arrangements e.g. for single beam tubes, storage and colour tubes. Coverage includes types of plasma display panels and tubes e.g. matrix displays, light emitting arrangements e.g. gas filling substances, details of electrode assemblies e.g. materials, supports and insulating coatings, and display drive circuit details. For details of tubes used for non-imaging purposes e.g. beam processing of workpieces, see the Derwent ITP ‘Valves and discharge tubes’.

Liquid crystal displays including construction details; e.g. transparent conductive films and alignment layers, LCD optical components and LCD circuits e.g. drive circuitry. Includes LCD illumination arrangements e.g. internal and reflection type illumination, and backlighting details. Constructional details, manufacture and driver circuits for Electrochromic displays. Electro-optic displays based on ceramics or electro-optical crystal exhibiting Kerr or Pockells effect. Details of EL light sources e.g. electroluminescent source manufacture, EL display structure, and circuits and drivers for EL displays.

See also Derwent ITP ‘Optical fibres and light transmission control’ which includes details of components for coupling, guiding e.g. optical waveguides, and for operating on (e.g. multiplexing), IR, visible or UV radiation.

The Derwent ITP also covers projection TV, and includes details of display applications e.g. for advertising and sports grounds etc.
ISSN 1463-7669

Includes hardcopy image and text reproduction equipment e.g. printers, electrophotographic equipment, and facsimile. Also includes hard-copy video output arrangements.

Coverage includes details of specific ‘types’ of printers e.g. Impact, Ink-jet, Thermal and Optical e.g. laser printers, sheet feeding arrangements and printer control systems in general, and details of image and character reproduction i.e. printing in e.g. facsimiles.

Includes electrical and non-electrical aspects of electrography, electrophotography and magnetography, including recording members e.g. photoconductive layers and intermediate or cover layers, and sensitising and exposing arrangements. Developing details using e.g. solid and liquid developer, and types of developer materials e.g. powders, liquids and toners. Sheet feeding and handling arrangements for transporting sheets through e.g. copier, collators and sorters.

Electronic image acquisition details are covered by the Derwent ITP ‘Video Cameras and Electronic Image Acquisition’ which includes details of electronic image pick-up arrangements e.g. using CCD, image scanners etc.
ISSN 1463-7650

Processing arrangements for video and analogous signals in facsimile equipment, TV receivers, data recording, TV cameras, and general or unspecified applications. Picture signal processing including electronic magnification, composing and layout control, image encoding and decoding in facsimile equipment. Includes processing arrangements for video signals, and colour signal processing e.g. demodulators and luminance-chrominance separation etc. in TV receivers.

Arrangements for television signal processing e.g. for noise suppression, scrambling, bandwidth reduction etc. for recording and reproduction applications irrespective of storage media. Transformation of TV signal for recording e.g. modulation and frequency changing. Multi-standard and HDTV signal processing, and standards conversion in recording applications. Covers video signal processing e.g. encoding, and applications to recording.

Covers computing arrangements for image data processing in general, regardless of application, e.g. image encoding, image enhancement and analysis, image manipulation e.g. enlargement, reduction and rotation, and image generation i.e. 3D modelling etc. Equipment for use TV studios having video processing function e.g. for video mixing, switching or special effects.
ISSN 1463-7707

This profile includes portable permanent and semi-permanent storage devices, which record and store analogue and digital data using magnetic, optical and magneto-optical methods. The profile covers details of the construction of the record carriers and their manufacture, the form of the carrier e.g. floppy discs and cards, and their applications e.g. to audio and video recording.
ISSN 1467-5366

Covers electrical and mechanical educational equipment in general e.g. simulators and teaching aids, sports equipment, and toys and games. Includes computer educational and training aids e.g. CAI, toys including computer games and computer video games, and details of computers used in sports equipment.

Includes details of electrical and electronic musical instruments e.g. keyboards, and musical training and practice equipment. Also covers training aids and simulators used in aviation, aerospace and marine applications, and training and simulation systems for military equipment.
ISSN 1463-7685

Electrical and mechanical aspects of still picture photography; e.g. focusing and rangefinding, lens positioning, film data marking, data displays, eye gaze direction detection, camera exposure control, e.g. camera shutter speed and aperture control, and light metering. Includes film winding and film loading details e.g. motorised control, and details of ‘peripheral’ camera equipment e.g. electronic and non-electronic flash units and power source details.

Photographic film processing aspects are also covered; e.g. enlarging, projecting, film cutting and film copying apparatus, including modification of exposure based on e.g. negative characteristics. Cinematography including cinema equipment and projectors. Projectors e.g. for photographic image or OHP transparency projection, and viewers e.g. for microfilm.

Includes electronic still picture cameras e.g. solid-state video camera which records single frames on e.g. disc or in RAM, and still picture recording facility on e.g. camcorders. See ITP ‘Video Cameras and Electronic Image Acquisition’ which includes details of electronic image pick-up arrangements e.g. using CCD, image scanners etc. for electronic imaging applications.
ISSN 1463-7642

Includes applications (specific equipment types) of recording and reproduction systems, e.g. video and audio tape recorders, digital VTR, DAT and personal stereo.

The Derwent ITP comprises of six sections; video tape recorders, audio tape recorders, magnetic audio and video disc equipment, optical recorder/player, magneto-optical recorder/player and cassette library systems

See also the Derwent ITPs ‘Components and Systems for Dynamic AV recording’, ‘Components and systems for dynamic recording' and ‘Data Recording and Reproduction Systems’.
ISSN 1463-7693

Covers all aspects of electronic image acquisition and pick-up arrangements using solid state devices e.g. CCD, and image scanners etc. for electronic imaging applications e.g. video cameras.

Coverage of video cameras includes electronic image acquisition details e.g. image pick-up device arrangements, read-out and operation circuitry for pick-up elements and electronic ‘still-picture’ camera details, i.e. recording single frames on disc or RAM. Coverage also includes optical systems for video cameras; e.g. optical filters and lenses, and lens positioning systems for e.g. auto-focusing and zooming etc. Motor drives for lens positioning are also included.

Scanning arrangements e.g. optical systems, lenses and scanning drive circuits, recording i.e. line image sensor and CCD details, and image acquisition details in general for facsimile systems.

Digitiser/scanner systems for computer input e.g. flat bed and hand-held scanner details. Image acquisition and image pre-processing for e.g. character and signal pattern recognition in i.e. robot vision and industrial process applications. See Derwent ITP ‘Still Picture Photography’ for electrical and mechanical aspects of still picture photography.
ISSN 1463-7634