ClassID:

231906

H04R1/227 - CPC Classification

Classification description:

Details of transducers, loudspeakers or microphones; Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only using transducers reproducing the same frequency band

Recent Application in this class:
#1
20260059231
2026-02-26

BASS LOUDSPEAKER SYSTEM

#2
20260052336
2026-02-19

A CONSTANT BEAMWIDTH LOUDSPEAKER

#3
20260045247
2026-02-12

AUDIO SPEAKERS ORIENTED FOR CONSTRAINING SOUND TRAVEL

#4
20250338059
2025-10-30

SPEAKERS

#5
20250184661
2025-06-05

SOUND-PRODUCING DEVICE

#6
20250121770
2025-04-17

MOTOR VEHICLE PROVIDED WITH FUEL CELLS WITH AN IMPROVED SOUND EMISSION

#7
20250119682
2025-04-10

PASSIVELY ASSISTED LOUDSPEAKER ENCLOSURE

#8
20240422475
2024-12-19

ACOUSTIC OUTPUT DEVICES

#9
20240416812
2024-12-19

AUDIO SYSTEM ARRANGED IN A LISTENING ENVIRONMENT IN A VEHICLE AND HEADREST FOR A VEHICLE

#10
20240365055
2024-10-31

ACOUSTIC OUTPUT APPARATUS

#11
20240284094
2024-08-22

SOUND-PRODUCING APPARATUS, CALIBRATION METHOD FOR SOUND-PRODUCING APPARATUS, SOUND-PRODUCING UNIT AND HEADSET EQUIPMENT

#12
20240251202
2024-07-25

ACOUSTIC OUTPUT DEVICE

#13
20240236548
2024-07-11

FRONT CENTER VEHICLE CONSOLE WITH SPEAKERS, AND VEHICLE COMPRISING SAME

#14
20240137691
2024-04-25

FRONT CENTER VEHICLE CONSOLE WITH SPEAKERS, AND VEHICLE COMPRISING SAME

#15
20240073589
2024-02-29

FORCE-CANCELLING AUDIO SYSTEM INCLUDING AN ISOBARIC SPEAKER CONFIGURATION WITH SPEAKER MEMBRANES MOVING IN OPPOSITE DIRECTIONS

#16
20240064456
2024-02-22

SOUND BAR FOR DETERRENCE OF ASIAN CARP

#17
20230388701
2023-11-30

Electroacoustic Transducer

#18
20230239606
2023-07-27

SPEAKER SYSTEM, SPEAKER DEVICE AND HOUSING THEREOF

#19
20230232150
2023-07-20

Passively assisted loudspeaker enclosure

#20
20230188897
2023-06-15

Sound-producing device

#21
20230156402
2023-05-18

Display device, sound producing control method, parameter determining method and device

#22
20230009102
2023-01-12

Acoustic output devices

#23
20230007385
2023-01-05

HEADPHONE

#24
20220417648
2022-12-29

Speaker module and portable electronic device

#25
20220360888
2022-11-10

Acoustic output apparatus

#26
20220182754
2022-06-09

Acoustic output device

#27
20220176165
2022-06-09

THERAPEUTIC SOUND AND DIRECTED SOUND TRANSMISSION SYSTEMS AND METHODS

#28
20220159378
2022-05-19

Method for providing audio data according to the folding state of an electronic device and electronic device for supporting same

#29
20220060817
2022-02-24

Space shaded constant beamwidth transducer

#30
20220046360
2022-02-10

Micromechanical sound transducer

#31
20210176545
2021-06-10

Sound system

#32
20200245060
2020-07-30

Loudspeaker arrangement

#33
20200154197
2020-05-14

ACOUSTIC PROCESSOR AND ACOUSTIC OUTPUT DEVICE

#34
20200137483
2020-04-30

Directive multiway loudspeaker with a waveguide

#35
20200015002
2020-01-09

Speaker position determination method, speaker position determination system, and audio apparatus

#36
20190387310
2019-12-19

Omni-directional speaker system and related devices and methods

#37
20190373360
2019-12-05

Speaker assembly

#38
20190281382
2019-09-12

Tubular passive acoustic radiator module

#39
20190090047
2019-03-21

Small subwoofer ceiling speaker system

#40
20190007770
2019-01-03

SOUND VOLUME CONTROL DEVICE, SOUND VOLUME CONTROL METHOD AND PROGRAM

#41
20180332403
2018-11-15

Loudspeaker arrangement

#42
20180288526
2018-10-04

Band-pass acoustic filter and acoustic sensing apparatus

#43
20180288522
2018-10-04

Loudspeaker apparatus

#44
20180255391
2018-09-06

Apparatus for managing distortion in a signal path and method

#45
20180242061
2018-08-23

Speaker device

#46
20180234751
2018-08-16

Multiple MEMS motor apparatus with common vent

#47
20180213321
2018-07-26

Vibration inducing tactile apparatus

#48
20180146298
2018-05-24

PIEZOELECTRIC SPEAKERS FOR ELECTRONIC DEVICES

#49
20180115835
2018-04-26

Compact electroacoustic transducer and loudspeaker system and method of use thereof

#50
20180091891
2018-03-29

Loudspeaker assembly

#51
20170311077
2017-10-26

Audio signal correction and calibration for a room environment

#52
20170303048
2017-10-19

Piezoelectric speakers for electronic devices

#53
20170289675
2017-10-05

Loudspeaker system with directional output character

#54
20170264995
2017-09-14

Speaker modules having different module housing geometries and similar acoustic properties

#55
20170188134
2017-06-29

Reducing ported transducer array enclosure noise

#56
20170142513
2017-05-18

Speaker device and electronic device including the same

#57
20160353198
2016-12-01

Passive acoustic radiator module

#58
20160337749
2016-11-17

Low diffraction tweeter housing

#59
20160316295
2016-10-27

Audio signal correction and calibration for a room environment

#60
20160269827
2016-09-15

Operable membranes device and digital speaker comprising at least one such device

#61
20160219362
2016-07-28

Acoustic device having active drivers mounted to a passive radiator diaphragm

#62
20160205464
2016-07-14

Loudspeaker apparatus

#63
20160088386
2016-03-24

Loudspeaker system audio recovery imaging amplifier

#64
20150326976
2015-11-12

Acoustic generator, acoustic generation device, and electronic device

#65
20150208151
2015-07-23

Immersive sound system

#66
20140305735
2014-10-16

Moving armature receiver assemblies with vibration suppression

#67
20140205135
2014-07-24

Loudspeaker and equipment including the same

#68
20140177902
2014-06-26

Electronic device having loudspeaker module

#69
20140161281
2014-06-12

Audio signal correction and calibration for a room environment

#70
20140140553
2014-05-22

Methods for wideband receiver and module for a hearing assistance device

#71
20140119576
2014-05-01

Piezoelectric speaker

#72
20140112513
2014-04-24

Horn amplifier

#73
20140029781
2014-01-30

Spherical sound source for acoustic measurements

#74
20130266151
2013-10-10

Electroacoustic transducer

#75
20130259285
2013-10-03

Loudspeaker system, Audio Recovery Imaging Amplifier

#76
20130182877
2013-07-18

Receiver system for a hearing instrument

#77
20130142371
2013-06-06

Detachable Audio Speakers for Portable Devices and Methods for Manufacturing such Speakers

#78
20130070949
2013-03-21

SOUND-REPRODUCING APPARATUS, LIGHTING APPARATUS, AND SUSPENDED OPENING AND CLOSING APPARATUS

#79
20130064391
2013-03-14

Acoustic beam forming array using feedback-controlled microphones for tuning and self-matching of frequency response

#80
20130034255
2013-02-07

Waveguide electroacoustical transducing

#81
20130016857
2013-01-17

Low frequency equalization for loudspeaker system

#82
20120294469
2012-11-22

Cover for hand-held electronic device

#83
20120281870
2012-11-08

Non-directional transducer

#84
20120255805
2012-10-11

Moving armature receiver assemblies with vibration suppression

#85
20120224735
2012-09-06

System and method for reducing baffle vibration

#86
20120207321
2012-08-16

SPEAKER DEVICE

#87
20120204422
2012-08-16

Sound systems for model railroad locomotives

#88
20120087525
2012-04-12

Speaker, hearing aid, inner-ear headphone, portable information processing device, and AV device

#89
20120070020
2012-03-22

SPEAKER DEVICE, AUDIO CONTROL DEVICE, WALL ATTACHED WITH SPEAKER DEVICE

#90
20120051573
2012-03-01

Passive acoustical radiating

#91
20120039502
2012-02-16

Film-type audio output apparatus

#92
20120008813
2012-01-12

Baffle vibration reducing

#93
20110235820
2011-09-29

Sound systems for model railroad locomotives

#94
20110037906
2011-02-17

Low frequency enclosure for video display devices

#95
20110033066
2011-02-10

Circular speaker

#96
20100294588
2010-11-25

Recoilless speaker system

#97
20100254550
2010-10-07

Reconfigurable acoustic transducer device

#98
20100232637
2010-09-16

SPEAKER DEVICE

#99
20100215208
2010-08-26

Voice coil assembly and loudspeaker using the same

#100
20100067730
2010-03-18

Apparatus for outputting sound comprising multiple receivers and a common output channel

#101
20100054492
2010-03-04

Leak-Tolerant Earspeakers, Related Portable Electronic Devices and Methods of Operating the Same

#102
20100027816
2010-02-04

System and method for reducing baffle vibration

#103
20100027815
2010-02-04

Acoustic-Mechanical Vibrating

#104
20100008521
2010-01-14

Volume and tone control in direct digital speakers

#105
20090323997
2009-12-31

Horn-loaded acoustic line source

#106
20090323995
2009-12-31

Miniature Planar Acoustic Networks

#107
20090257611
2009-10-15

System and method for reduced baffle vibration

#108
20090252363
2009-10-08

Loudspeaker assembly

#109
20090245561
2009-10-01

Acoustic passive radiating

#110
20090226026
2009-09-10

TECHNIQUES FOR AUDIO AND SPECIAL EFFECTS PRODUCTION

#111
20090208026
2009-08-20

Baffle vibration reducing

#112
20090084625
2009-04-02

Acoustic waveguide mode controlling

#113
20090016556
2009-01-15

Sound systems for model railroad locomotives

#114
20090003639
2009-01-01

Electroacoustic waveguide transducing

#115
20080212807
2008-09-04

Micromachined Acoustic Transducers

#116
20080169151
2008-07-17

Loudspeaker port handle

#117
20080152180
2008-06-26

Film-type audio output apparatus

#118
20080063224
2008-03-13

Sound system

#119
20080056516
2008-03-06

Compact open baffle speaker system

#120
20080031472
2008-02-07

Electroacoustical transducing

#121
20070172082
2007-07-26

Low frequency equalization for loudspeaker system

#122
20070172081
2007-07-26

Low frequency equalization for loudspeaker system

#123
20070154038
2007-07-05

Non-directional transducer

#124
20070092096
2007-04-26

PASSIVE ACOUSTICAL RADIATING

#125
20070030992
2007-02-08

Low frequency loudspeaker enclosure

#126
20060291684
2006-12-28

Passive acoustic radiating

#127
20060280321
2006-12-14

Acoustic apparatus

#128
20060233403
2006-10-19

Multi speaker unit and audio reproduction apparatus

#129
20060078144
2006-04-13

Compound-driven augmented passive radiator

#130
20060049889
2006-03-09

Digital loudspeaker

#131
20060029241
2006-02-09

Increased LF spectrum power density loudspeaker system

#132
20060029240
2006-02-09

Loudspeakers

#133
20060008107
2006-01-12

Speaker device

#134
20050194204
2005-09-08

Sound systems for model railroad locomotives

#135
20050111673
2005-05-26

Baffle vibration reducing

#136
20050047622
2005-03-03

Subwoofer with cascaded linear array of drivers

#137
20050039975
2005-02-24

Speaker system

#138
20050036645
2005-02-17

High back EMF, high pressure subwoofer having small volume cabinet, low frequency cutoff and pressure resistant surround

#139
20050018868
2005-01-27

Passive acoustic radiating

#140
18375443
2024-02-27

Loudspeaker tower and soundbar

#141
17063496
2021-11-23

Hearing devices and methods for implementing an adaptively adjusted cut-off frequency

#142
16452486
2020-06-30

Crossover for multi-driver loudspeakers

#143
15813162
2018-08-21

Wireless microphone receiver and method in the wireless microphone receiver