H
SECTION H — ELECTRICITY
 H04
ELECTRIC COMMUNICATION TECHNIQUE
 H04

Note(s)

This class covers electrical communication systems with propagation paths employing light (optical communication), infra-red, ultrasonic, sonic, or infrasonic waves.

 H04R
ELECTROMECHANICAL TRANSDUCERS (for performing mechanical work B06B; use of transducers as sensing elements for measuring G01, G04; construction or circuits of vibrators whose output is of frequency unrelated to that of the electric supply G10K; recording or reproducing heads incorporating transducers G11B; dynamo-electric machines H02K)
 H04R

Note(s)

This subclass covers:

  • instruments capable of converting sonic, ultrasonic, or infrasonic waves, or other mechanical vibrations into variations of electric current or voltage or vice versa;
  • instruments actuated by variations of electric current or voltage for cutting grooves in records;
  • circuits for the above-mentioned instruments;
  • deaf-aid sets;
  • public address systems;
  • monitoring or testing the above-mentioned equipment.

 H04R 1/00
Details of transducers covered by groups H04R 9/00-H04R 23/00 (diaphragms H04R 7/00; mountings specially adapted for telephone equipment H04M 1/02)
 H04R 1/02
·  Casings; Cabinets; Mountings therein (H04R 1/28 takes precedence)
 H04R 1/04
·  ·  Structural association of microphone with electric circuitry therefor (in deaf-aid sets H04R 25/00)
 H04R 1/06
·  Arranging circuit leads; Relieving strain on circuit leads
 H04R 1/08
·  Mouthpieces; Attachments therefor
 H04R 1/10
·  Earpieces; Attachments therefor
 H04R 1/12
·  Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection
 H04R 1/14
·  Throat mountings for microphones
 H04R 1/16
·  Mounting or connecting stylus to transducer with or without damping means
 H04R 1/18
·  ·  Holders for styli; Mounting holders on transducers
 H04R 1/20
·  Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purposes H04R 5/00)
 H04R 1/22
·  ·  for obtaining desired frequency characteristic only (circuits for combining transducers having different responses H04R 3/00)
 H04R 1/24
·  ·  ·  Structural combinations of separate transducers or of parts of the same transducer and responsive respectively to two or more frequency ranges
 H04R 1/26
·  ·  ·  Spatial arrangement of separate transducers responsive to two or more frequency ranges
 H04R 1/28
·  ·  ·  Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
 H04R 1/30
·  ·  ·  Combinations of transducers with horns, e.g. with mechanical matching means (horns in general G10K)
 H04R 1/32
·  ·  for obtaining desired directional characteristic only
 H04R 1/34
·  ·  ·  by using a single transducer with sound reflecting, diffracting, directing or guiding means
 H04R 1/36
·  ·  ·  ·  by using a single aperture of dimensions not greater than the shortest operating wavelength
 H04R 1/38
·  ·  ·  ·  in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
 H04R 1/40
·  ·  ·  by combining a number of identical transducers
 H04R 1/42
·  Combinations of transducers with fluid-pressure or other non-electrical amplifying means
 H04R 1/44
·  Special adaptations for subaqueous use, e.g. for hydrophone
 H04R 1/46
·  Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope (throat mountings H04R 1/14)
 H04R 3/00
Circuits for transducers (for stereophonic arrangements H04R 5/04; amplifiers H03F)
 H04R 3/02
·  for preventing acoustic reaction
 H04R 3/04
·  for correcting frequency response
 H04R 3/06
·  ·  of electrostatic transducers
 H04R 3/08
·  ·  of electromagnetic transducers
 H04R 3/10
·  ·  of variable-resistance microphones
 H04R 3/12
·  for distributing signals to two or more loud-speakers
 H04R 3/14
·  ·  Cross-over networks
 H04R 5/00
Stereophonic arrangements (stereophonic pick-ups H04R 9/16, H04R 11/12, H04R 17/08, H04R 19/10)
 H04R 5/00

Note(s)

In this group, the following expression is used with the meaning indicated:

  • "stereophonic arrangements" covers quadraphonic or similar arrangements. [3]

 H04R 5/02
·  Spatial or constructional arrangements of loud-speakers
 H04R 5/027
·  Spatial or constructional arrangements of microphones, e.g. in dummy heads  [3]
 H04R 5/033
·  Headphones for stereophonic communication  [3]
 H04R 5/04
·  Circuit arrangements (combinations of amplifiers H03F 3/68; stereophonic systems H04S)
 H04R 7/00
Diaphragms for electromechanical transducers (in general F16J 3/00); Cones (for musical instruments G10)
 H04R 7/02
·  characterised by the construction
 H04R 7/04
·  ·  Plane diaphragms
 H04R 7/06
·  ·  ·  comprising a plurality of sections or layers
 H04R 7/08
·  ·  ·  ·  comprising superposed layers separated by air or other fluid
 H04R 7/10
·  ·  ·  ·  comprising superposed layers in contact
 H04R 7/12
·  ·  Non-planar diaphragms or cones
 H04R 7/14
·  ·  ·  corrugated, pleated, or ribbed
 H04R 7/16
·  Mounting or tensioning of diaphragms or cones
 H04R 7/18
·  ·  at the periphery
 H04R 7/20
·  ·  ·  Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
 H04R 7/22
·  ·  ·  Clamping rim of diaphragm or cone against seating
 H04R 7/24
·  ·  Tensioning by means acting directly on free portion of diaphragm or cone
 H04R 7/26
·  Damping by means acting directly on free portion of diaphragm or cone (air damping H04R 1/28)
 H04R 9/00
Transducers of moving-coil, moving-strip, or moving-wire type
 H04R 9/02
·  Details
 H04R 9/04
·  ·  Construction, mounting, or centering of coil
 H04R 9/06
·  Loud-speakers
 H04R 9/08
·  Microphones
 H04R 9/10
·  Telephone receivers
 H04R 9/12
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 9/14
·  ·  comprising two or more styli or transducers (H04R 9/16 takes precedence)
 H04R 9/16
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 9/18
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 11/00
Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly co-acting with electromagnet H04R 13/00)
 H04R 11/02
·  Loud-speakers
 H04R 11/04
·  Microphones
 H04R 11/06
·  Telephone receivers
 H04R 11/08
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 11/10
·  ·  comprising two or more styli or transducers (H04R 11/12 takes precedence)
 H04R 11/12
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 11/14
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 13/00
Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
 H04R 13/02
·  Telephone receivers
 H04R 15/00
Magnetostrictive transducers (magnetostrictive devices in general H01L 41/00)
 H04R 15/02
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 17/00
Piezo-electric transducers; Electrostrictive transducers (piezo-electric or electrostrictive devices in general H01L 41/00)
 H04R 17/02
·  Microphones
 H04R 17/04
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 17/06
·  ·  comprising two or more styli or transducers (H04R 17/08 takes precedence)
 H04R 17/08
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 17/10
·  Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
 H04R 19/00
Electrostatic transducers
 H04R 19/01
·  characterised by the use of electrets  [3]
 H04R 19/02
·  Loud-speakers (H04R 19/01 takes precedence)  [3]
 H04R 19/04
·  Microphones (H04R 19/01 takes precedence)  [3]
 H04R 19/06
·  Gramophone pick-ups using a stylus; Recorders using a stylus (H04R 19/01 takes precedence)  [3]
 H04R 19/08
·  ·  comprising two or more styli or transducers (H04R 19/10 takes precedence)
 H04R 19/10
·  ·  signals being recorded or played-back by vibration of a stylus in two orthogonal directions simultaneously
 H04R 21/00
Variable-resistance transducers (gaseous-resistance transducers H04R 23/00; magneto-resistive transducers H04R 23/00)
 H04R 21/02
·  Microphones
 H04R 21/04
·  Gramophone pick-ups using a stylus; Recorders using a stylus
 H04R 23/00
Transducers other than those covered by groups H04R 9/00-H04R 21/00
 H04R 23/02
·  Transducers using more than one principle simultaneously
 H04R 25/00
Deaf-aid sets (constructions of transducers per se H04R 9/00-H04R 23/00; structural combination with spectacle frames G02C 11/06)
 H04R 25/02
·  adapted to be supported entirely by ear
 H04R 25/04
·  comprising pocket amplifiers
 H04R 27/00
Public address systems (circuits for preventing acoustic reaction H04R 3/02; circuits for distributing signals to loud-speakers H04R 3/12; amplifiers H03F)
 H04R 27/02
·  Amplifying systems for the deaf
 H04R 27/04
·  Electric megaphones
 H04R 29/00
Monitoring arrangements; Testing arrangements
 H04R 31/00
Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor