UKC Key_ Section H Electricity by keara


									H4J        Audio transducers, local circuits &c                                                  H4J
             This heading is primarily concerned with audio transducers, their associated circuits and certain audio
             transducer elements. It also covers systems and instruments (eg telephone instruments) incorporating such
             transducers, circuits associated with transducer systems, hearing aid circuits, telephone instrument accessories
             and certain miscellaneous subject matter
             Explanation of heading subject matter and relationships with other headings
             This is the general heading for transducers for converting variations in electric current or voltage into
             corresponding sonic, ultrasonic or infrasonic waves or other mechanical vibrations or vice versa. The term
             “transducer” normally implies the presence of acoustic wave or vibration coupling arrangements in addition to
             the mechanical-to-electric transducing element itself. Bells, buzzers and similar devices in which the acoustic
             waveform is independent of variations of the electrical supply (which merely provide the motive power) are
             excluded and are covered by heading G5J, Sound-producing instruments &c unless the transducing element is
             piezoelectric or electrostrictive. Devices for the production of electrical power from mechanical or acoustic wave
             energy are also excluded and are covered by heading H2A, Dynamo-electric machines &c. This heading is
             residual for magnetostrictive devices functioning other than as audio transducers
             Other exclusions are:
             . transmitting and/or receiving probes for acoustic measuring—G1G, Acoustic measuring
             . transducers for producing electric signals corresponding to motions other than vibrations—G1N,
                   Electrophysical and electrochemical measurement &c
             . electroacoustic transducers in or specially adapted for picking up sound in musical instruments—G5J, Sound-
                   producing instruments &c
             . phonon-masers, ie devices in which generation or amplification of sonic or ultrasonic energy is achieved by
                   stimulated emission involving discrete changes in the energy levels of atoms or molecules in response to
                   appropriate stimulation and pumping—H1C, Stimulated-emission devices
             . transducers forming part of electromechanical filters and delay lines and of interest solely thereto—H3U,
                   Impedance networks &c
             This is the general heading for subsystems, components and elements of the above transducers, and for acoustic
             and non-acoustic enclosures, housings, casings and mountings therefor. For historical reasons the heading also
             includes a collection of matter concerned with acoustic diaphragms for devices, eg non-electric devices, with
             which the heading is not nominally concerned. Such matter has been classified according to the matter with
             which it is analogous
             Excluded are:
             . acoustic couplings for acoustic measuring or testing probes—G1G, Acoustic measuring
             . diaphragms for musical instruments—G5J, Sound-producing instruments &c
             . attachments of styli to shanks and actuators of pick-ups unless the stylus is itself the transducing
                  element—G5R, Recording and playback
             . devices for modifying the acoustic properties of broadcasting and gramophone-recording studios, concert halls
                  and like chambers—G5X, Ciphering, flags, music &c
             . horns per se—H4X, Sound magnifiers &c
             This is also the general heading for associations of a plurality of the above transducers to form systems adapted
             to generate or detect spatial or spectral distribution of acoustic waves or to form particular instruments, eg
             telephone handsets. A transducer which is designed to have a non-uniform response across its surface, eg such
             as to act as a directional or phased array, is considered here to comprise a plurality of (separate) transducers.
             However, a stereo pick-up or cutter with a single stylus coupled to two motors or generators is considered as
             one transducer
             Excluded are:
             . certain sound directing arrangements involving the phase co-ordination of two or more sources—G4F,
                  Signalling systems; G1G, Acoustic measuring
             This heading is residual for associations of one or more such transducers or systems with other apparatus where
             there is no suitable provision in the heading appropriate to the other apparatus
             Examples of associations provided for in other headings are:
             . stands for microphones—A4L, Furniture &c
             . fitting and adapting instruments to machinery and structures to detect vibrations therein—F2P, Pipes and
                   tubes; G1J, Expressing measurement &c; G1S, Measuring and testing physical properties
             . arrangements for translating a transmitting or receiving probe over the surface of a test piece—G1G, Acoustic
             . systems for measuring sound or non-electric variables by means of sound—G1G, Acoustic measuring
             . mounting transducers on ships' sides for reception of subaqueous sounds—G4F, Signalling systems
             . mounting transducers on musical instruments—G5J, Sound-producing instruments &c
             . supporting audio transducers in gramophone recording and playback units, including illuminating and
                   lubricating devices therefor and arrangements permitting pick-ups to yield under excess stylus
                   pressure—G5R, Recording and playback
             . structural combinations of transducers with radio receiving sets—H3Q, Radio receivers &c

O/J                                                      H4J—1
H4J        Audio transducers, local circuits &c—cont                                             H4J
             Explanation of heading—cont
             This heading is also concerned with methods of manufacturing the components, subsystems and devices
             covered, such methods being classified with the component, subsystem or device manufactured. It is general
             for such methods involving plural steps except that affinity exists with heading B3A, Multi-operation metal
             article manufacture (term A49V, Transducers) in which search may be necessary, but is residual for single step
             methods which are only classified here when no other heading is appropriate
             This heading is also general for testing and calibrating arrangements and methods for the transducers and parts
             thereof covered
             This is the general heading for local transducer circuits (eg cross-overs mixing circuits and active sound
             cancellation circuits), and for deaf aid circuits
             Excluded are:
             . sound-generators incorporating electronic oscillators coupled to audio transducers for producing sound (eg
                   electrophonic musical instruments, “audiometers”, sleep inducers)—G5J, Sound-producing instruments
             . circuits for recorders and pick-ups using records played back otherwise than by a stylus—G5R, Recording and
             . circuits for maintaining a resonator in tune with a reference oscillation applied thereto—H3A, Automatic
                   control of frequency and phase
             . means for controlling volume or tone automatically—H3G, Control of amplification; H4R, Line transmission
                   systems; signal processing
             . gramophone circuit connections to radio receiving sets—H3Q, Radio receivers &c
             . circuits for modulating a carrier with signal currents or voltages—H3R, Modulating; demodulating; frequency
             . circuits which rectify signal currents of capacitor transducers to provide d.c. bias—H3R, Modulating;
                   demodulating; frequency changing; other H3 headings as appropriate
             . amplifiers per se—H3W, Linear amplifiers; limiters
             . party-line selecting apparatus in telephone sets—H4K, Telecommunications switching &c
             . telephone sub-station circuits, telephone dictation systems and other circuits for recording and reproducing
                   messages and conversations between telephone subscribers—H4K, Telecommunications switching &c
             . electrical systems for producing binaural, directional or reverberation effects—H4R, Line transmission
                   systems; signal processing
             This is the general place for telephone instruments and the like and for accessories therefor
             Excluded are:
             . memorandum appliances—B6A, Stationery, bookbinding &c
             . indexes and indicators for subscribers' names and numbers—B6E, Filing papers &c; G5C, Signs, indicators,
                   displays and advertising &c
             . apparatus automatically taking up slack in leads—B8B, Winches, tackles &c; counterbalancing
             . telephone sets of associated telephones and television—H4F, Pictorial communication
             . coin and check freed apparatus for telephone sets—H4K, Telecommunications switching &c
             . meters and time-indicators for telephone sets—H4K, Telecommunications switching &c
             . telephone impulse transmitters, and accessories therefor other than illuminating devices—H4K,
                   Telecommunications switching &c
             This is also the general heading for the miscellaneous subject-matter covered by terms JN (circuits and
             electrically energised apparatus designed to enable the dumb to communicate by speech) and JP (deaf aid and
             other signalling arrangements operating by direct electrical stimulation of nerves to produce a physiological
             effect of hearing) of the Classifying schedule below
             The exclusion references listed in this heading are not exhaustive. Reference should be made to the appropriate
             general heading/s for processes, materials, elements or devices which may be more widely applicable than can
             appropriately be classified in this heading
             Operative date for Key entries
             The operative dates of the terms in this heading are:
                 1. for terms annotated by a marginal code, that of the Edition corresponding to that code
                 2. for all other terms, that of Edition A
             Search note
             The residual indexing terms indicated by an asterisk are only assigned for features, not specifically indexable,
             considered to have some significant search value; remaining indexing terms are non-discretionary

O/N                                                     H4J—2
    H4J        Audio transducers, local circuits &c—cont                                             H4J
                 Classifying Schedule
h   JA           associations of one or more transducers with other apparatus
                 . See also Indexing Schedule 1
                 associations of a plurality of transducers
                 . circuits therefor—See terms JGA-JGX or JH below—
                 . See also Indexing schedule 1
                 . microphone-reproducer combinations—
h   JAAA         . . deaf aid sets
h   JAAB         . . hand sets
                 . . . one-piece telephones—See term JK below
h   JAAX         . . other
    JAB          . the transducers performing similar functions (eg a plurality of loudspeakers; terms JBA, JBX have precedence)
    JAX          . other
                 functional and structural organisation of acoustic enclosures, cavities, passages or baffles modifying the
                       frequency or directional response of the transducer—
                 . See also Indexing Schedules 1 and 2
h   JBA          . of loudspeakers
h   JBX          . other
                 design and structural organisation of transducers—
                 . See also Indexing Schedule 1
h   JCA          . with coil, strip or wire moving in a magnetic field
h   JCB          . with moving armature or core (including diaphragm acting as moving armature)
h   JCD          . magnetostrictive
h   JCE          . piezo-electric or electrostrictive
                 . . piezo-electric resonators and transducers, of general or unspecified application—See H1E, Piezo-electric
                      elements &c
h   JCF          . capacitive (including electret)
h   JCG          . variable resistance (including piezoresistive and magnetoresistive)
h   JCX          . other (including operative combinations of two or more of the above types)
                 . See also Indexing Schedule 1
h   JDK          . ultrasonic coupling of motor or generator to output or input member of transducer
    JDA          . acoustical or mechanical (other than ultrasonic) coupling of motor or generator to output or input member of
                 . damping or enhancing movement—
                 . . using ultrasonic horns &c—See term JDK above
    JDB          . . mechanically
                 . . . damped stylus arm mountings—See term JDN below
                 . . acoustically by enclosures, cavities, passages or baffles—See terms JBA, JBX above
    JDC          . . other (including magnetically and electrodynamically)
h   JDF          . associations of magnetic circuits with moving coils, strips, wires, cores or armatures (including relative
                        adjustments therebetween)
h   JDJ          . magnetic circuits
                 . mechanically supporting—
    JDM          . . diaphragms, or members directly secured thereto, on stationary members (including constructions of
    JDN          . . stylus arms, armatures of record pick-ups or cutters on stationary members (including detachable stylus
    JDP          . . other components of a transducer on one another
    JDQ          . . a transducer as a whole within a casing or on some other structure
    JDS          . . a transducer or transducers on or adjacent to parts of the body of a person
                 . . . accessories for telephone handsets—See term JL below
    JDT          . preventing excessive movement
                 . . spiders—See term JDM above
                 . . damping—See terms JDB, JDC above
    JDV          . protecting from and compensating for the effects of adverse environments
                 . . corrosion, dust &c casings—See term JEA below
                 . . magnetic shielding—See term JDJ above
    JDX          . providing some other function
                 selection of material for and the design of elements and components of transducers and of casings therefor—
                 . See also Indexing Schedule 1
    JEA          . casings for transducers other than as covered by terms JBA, JBX
    JEB          . coils or other current carrying members producing or interacting with magnetic fields (including coil formers)

    O/O                                                     H4J—3
    H4J        Audio transducers, local circuits &c—cont                                             H4J
                 Classifying Schedule—cont
    JED          . diaphragms
                 . . magnetic diaphragms acting as armatures—See term JEX below
                 . . See also Indexing Schedule 3
    JEG          . leads, terminals and contacts
h   JEP          . mouthpieces, earpieces, tube and similar means carrying sound to/from transducers
    JEX          . other (including motors and generators not otherwise provided for, baskets, armatures, granule chambers &c)
    JFT          methods and arrangements for testing the performance of and calibrating transducers or parts thereof
                 . monitoring transducer circuits—See terms JG- below
                 . See also Indexing Schedule 1
                 local transducer circuits, other than deaf aid circuits
                 . See also Indexing Schedule 1
h   JGA          . active sound cancellation circuits
                 . loudspeaker circuits (including circuits for headphones, earphones and similar receivers)—
h   JGB          . . cross-overs
h   JGC          . . other
h   JGE          . circuits for resonant and other fixed frequency transducers
h   JGF          . microphone circuits (including circuits for similar transmitters, eg hydrophones)
h   JGP          . cross-fading, mixing and other channel switching circuits
                 . . combining to produce directional effects—See terms JGC, JGF, JGX
h   JGX          . other local transducer circuits (including associations or alternatives of two or more circuits covered by JGA-
    JH           deaf aid circuits
                 . See also Indexing Schedule 1
    JK           functional and structural organisation of telephone instruments
                 . associations of a plurality of transducers—See terms JA- above
                 . See also Indexing Schedules 1 and 4
    JL           accessories for telephone instruments
                 . attachments for carrying sound from earpiece or to mouthpiece—See term JEP above
                 . See also Indexing Schedules 1 and 5
    JN           circuits and electrically energised apparatus designed to enable the dumb to communicate by speech
                 . See also Indexing Schedule 1
    JP           deaf aid and other signalling arrangements operating by direct electrical stimulation of nerves to produce a
                      physiological effect of hearing
                 . See also Indexing Schedule 1

    O/H                                                     H4J—4
        H4J        Audio transducers, local circuits &c—cont                                             H4J
                     Indexing Schedule 1
                     Terms from this schedule are assignable with any classifying term
                     kinds or types of transducers, and applications thereof—
        J30A         . deaf aid
                     . gramophone pick-ups or record cutters (including video)—
        J30B         . . binaural or stereophonic
        J30C         . . monaural
        J30D         . . video
        J30E         . . other
        J30F         . loudspeakers
                     . microphones—
        J30G         . . contact microphones
        J30H         . . other
                     . receivers—
                     . . loudspeakers—See term J30F above
        J30J         . . bone conduction
        J30K         . . earphones (including telephone receivers)
        J30L         . . other
        J30M         . stethoscopes and detectors of vibrations in solid objects (eg the earth, machinery, buildings)
        J30N         . sub-aqueous use (eg hydrophones)
        J30X         . other kinds or types or applications
                     kinds or types of generator or motor used—
        J31A         . capacitor
        J31B         . magnetic acoustic diaphragm directly coacting with electromagnet
        J31C         . magnetostrictive
                     . moving armature or core
                     . . armature forming acoustic diaphragm—See term J31B above
        J31D         . . balanced armature
        J31E         . . vibrating magnet or pole piece
        J31F         . . other
                     . moving coil, strip or wire in magnetic field—
        J31G         . . ribbon type
        J31H         . . other
        J31J         . piezoelectric or electrostrictive
        J31K         . solid state
                     . . piezoelectric or electrostrictive—See term J31J above
                     . . variable resistance—See term J31L below
                     . . magnetoresistive—See term J31R below
        J31L         . variable resistance
h       J31P         . photoelectric
        J31R         . other (including magneto-resistive)
        J31S         . transducers using more than one type of generator or motor
        J31T         . resonant transducers
        J31V         . transducers usable at ultrasonic frequencies
        J31W         . transducers using electrets
                     Indexing Schedule 2
                     Terms from this schedule are assignable only when classifying terms JBA or JBX have been assigned
        J33A         baffles
        J33B         casings containing acoustic resistance elements
        J33C         hydrophone casings
                     loudspeaker enclosures—
        J33D         . incorporating two or more loudspeakers
        j33E         . containing or constituting a horn
        J33F         . enclosing selected acoustic material (eg lining, filling)
                     . . enclosing acoustic resistance elements—See term J33B above
        J33G         . made of selected material
        J33H         . sealed enclosures
        J33J         . vented enclosures
    *   J33K         . other loudspeaker enclosure features
                     microphone enclosures—
        J33L         . incorporating two or more microphones
    *   J33M         . other microphone enclosure features

        O/H                                                     H4J—5
        H4J        Audio transducers, local circuits &c—cont                                             H4J
                     Indexing Schedule 3
                     Terms from this schedule are assignable only when classifying term JED has been assigned
        J34A         . comprising piezoelectric material
        J34B         . comprising two or more layers (excluding mere electrode layers)
        J34C         . conical or elliptical
        J34D         . flexible
        J34E         . held under tension
                     . made substantially of—
        J34F         . . metal
        J34G         . . paper or other cellulose material
                     . . plastic material—
        J34H         . . . foamed plastics
        J34J         . . . other
        J34K         . . other materials
        J34L         . planar or substantially planar on at least one side
        J34M         . rigid or self-supporting
        J34N         . varying thickness
        J34P         . with slits or perforations (including perforations covered or filled in)
        J34Q         . with stiffening ribs
    *   J34X         . other diaphragm features
                     Indexing Schedule 4
                     Terms from this schedule are assignable only when classifying term JK has been assigned
        J36A         comprising amplifiers
        J36B         comprising loudspeakers
        J36C         desk sets or table sets
        J36E         fire, police or other call boxes, modified for
        J36F         hooks and cradles
        J36G         . on handsets, receivers or microphones
        J36H         . operated or released by magnetic effect due to proximity of handset or receiver
        J36J         . operated or released by weight of handset or receiver
        J36K         . other
        J36L         illuminating devices
        J36M         modified or constructed for ships, mines or exposed places
        J36N         mounting impulse transmitter or tone generator
        J36Q         portable
        J36R         structurally combined with other apparatus (eg writing desk equipment)
                     . call boxes—See term J36E above
        J36S         wall sets
                     Indexing Schedule 5
                     Terms from this schedule are assignable only when classifying term JL has been applied
h       J37K         means for supporting handsets for “hands-free” operation
        J37G         supports for handsets, sets or receivers (other than as covered by term J37K)
        J37F         sanitary or hygienic devices
        J37X         other accessories for telephone instruments

        O/H                                                      H4J—6

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