WO2004040941A1 - Multichannel headphones - Google Patents

Multichannel headphones Download PDF

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Publication number
WO2004040941A1
WO2004040941A1 PCT/HR2003/000055 HR0300055W WO2004040941A1 WO 2004040941 A1 WO2004040941 A1 WO 2004040941A1 HR 0300055 W HR0300055 W HR 0300055W WO 2004040941 A1 WO2004040941 A1 WO 2004040941A1
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeakers
sound
headphones
multichannel
earphone
Prior art date
Application number
PCT/HR2003/000055
Other languages
French (fr)
Inventor
Sinisa Milnersic
Original Assignee
Sinisa Milnersic
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinisa Milnersic filed Critical Sinisa Milnersic
Priority to AU2003274386A priority Critical patent/AU2003274386A1/en
Publication of WO2004040941A1 publication Critical patent/WO2004040941A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/10Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058Manufacture or assembly
    • H04R1/1075Mountings of transducers in earphones or headphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/10Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1008Earpieces of the supra-aural or circum-aural type
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/022Plurality of transducers corresponding to a plurality of sound channels in each earpiece of headphones or in a single enclosure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/033Headphones for stereophonic communication

Definitions

  • the present invention relates to multichannel headphones consisting of six (6) small loudspeakers (Type 1), namely sixteen (16) or more small loudspeakers (Type 2) that are fitted into each earphone.
  • this invention is classified under H04R1 - loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical tansducers, specifically H04R1/10 - earpieces.
  • One of the multimedia components is the three-dimensional (3D) sound system which aim is to deliver natural sound images to the listener.
  • the delivery of the natural sound sensation to the listener is achieved through several separate sound channels.
  • the 3D sound is especially important for DVD and VHS home theatre systems, high resolution televisions, PC games, game consoles as well as for a myriad of multimedia systems that will be devised in the future. Since the development and evolution of the multichannel sound proceeded gradually, it resulted in the rise of many multisound reproduction standards/systems. Up until now, there were no difficulties in meeting the different reproduction standards, since multichannel sound was reproduced through loudspeakers.
  • the challenge was to devise headphones that can reproduce high quality multichannel sound from the majority of the registered standardized sound sources, such as: 2.0 (Stereo), 4.0 (Dolby Surround), 5.0 (Dolby Pro-Logic Surround), 5.1 (Dolby Digital Surround and DTS), 6.1 (DTS-ES and THX-EX), 7.1 (THX-EX). It is also very hard to devise headphones that can reproduce sounds coming from above or below the user ("vertical surround sound").
  • the primary aim of this invention is to devise universal headphones that deliver a natural three-dimensional sensation and that are compatible with all known multichannel sound standards (Type 1) as well as universal headphones that in addition reproduce 3D vertical surround sound (Type 2).
  • the secondary aim of this invention is to devise universal headphones that can reproduce sounds from as many as possible multimedia systems. Further, another object of the present invention is to devise headphones for privately enjoying realistic 3D sounds.
  • a headphone system capable of being listened to by a person in private, at home, with the ability to adjust the volume at a comfortable level.
  • the headphones in this invention consist of 6 small loudspeakers (Type 1), namely 16 or more loudspeakers (Type 2) that are built-in each earphone, individual reproducing sound channels that each have their own air chambers, a plastic housing that connects all the chambers, cylindrical sponge padded earcups that rest on the ears, as well as a multi-wire cord that connects the earphones to the audio amplifier. All the loudspeakers have separate electric outputs.
  • the loudspeakers are connected to the audio amplifier with corresponding couplings in order to reproduce a 3D sound of a certain standard/system.
  • Figure 1 shows the top view of the right headphone.
  • the letter N for nose shows the direction the head is facing.
  • This figure shows the Type 1 earphone.
  • Figure 2 shows the spatial view of the Type 1 right earphone with the corresponding loudspeakers and other earphone components.
  • Figure 3 shows the spatial view of the Type 2 right earphone with 16 corresponding loudspeakers as well as all the other earphone components.
  • the Type 1 right earphone consists of 6 loudspeakers 1 , 2, 3, 4, 5 and 6. Loudspeakers 1 , 2, 3, 4, and 5 are identical and cover a wide range of frequencies. Together with the corresponding air chambers, these loudspeakers are aligned with the ear opening (U), and are arranged symmetrically in the direction of the ear opening.
  • the sixth loudspeaker is slightly larger and it is a low-frequency loudspeaker. Its position is of no critical importance. It can be placed anywhere within the earphone housing (13).
  • Right and left earphone speakers 1 represent the central loudspeakers for the 3D sound.
  • Right and left earphone speakers 2 represent the front right namely front left speakers for the 3D sound.
  • Right and left earphone speakers 3 represent the right surround, namely left surround loudspeakers.
  • Right and left earphone speakers 5 represent the right rear, namely left rear surround loudspeakers.
  • Right and left earphone speakers 4 are not intended for reproducing present 3D sounds but are reserved for future systems.
  • Right and left earphone loudspeakers 6 represent the low-frequency speakers - subwoofer.
  • FIG 2 shows the dome-shaped earphone housing that has thick and hollow walls, which serve as air chambers for the loudspeakers.
  • Each loudspeaker has its own air chamber.
  • the air chambers are marked in Figure 1 as 7, 8, 9, 10, 11 and 12.
  • the structure of the Type 2 earphone is similar to the Type 1 earphone except that here instead of a single line of loudspeakers there are three stacks of loudspeakers. Instead of loudspeaker 1 there are loudspeakers 1A, 1B, 1C with corresponding three chambers. The same is with loudspeakers 2, 3, 4 and 5.
  • loudspeakers 2, 3, 4 and 5 there are loudspeakers 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B, 4C, 5A, 5B and 5C.
  • loudspeakers 6 There is still only one loudspeaker 6 and thus there are altogether 16 loudspeakers.
  • This arrangement of the loudspeakers enables all combinations as in the Type 1 earphone, except that here the reproduction of the "vertical" 3D sound can be achieved, e.g. we can actually hear an airplane descending and landing on the runway.
  • the Figure shows an earphone with loudspeakers stacked in three rows. However, earphones with 4, 5 and more rows of loudspeakers can be made in which case the reproduction of the 3D sound would be even more realistic. In such case, the total number of loudspeakers would be 21 , 26 or more. All Type 1 and Type 2 earphones have their own electric outputs that are coupled to the audio amplifier channels by means of a multi-wire cord (15).
  • a cylindrical sponge pad 14 (Figure 1) is placed between the earphone housing and the head.
  • the sponge pads are not shown in Figure 2 in order to get a better view of the other details.
  • the headband portion ( Figure 2) is used for connecting the left and right earphones.
  • a self-adjusting headband mechanism that ensures a personalized fit can be added.
  • the present invention is a practical and useful audio apparatus, which may be easily and efficiently manufactured and marketed. It includes significant improvements as compared to the existing versions.
  • the invention may readily be utilized because of its universal quality, namely it can be used in combination with more than one audio source and it can replace almost all of the currently known similar headphone apparatuses. Simple changes and modifications, i.e. including more speakers make it possible for this apparatus to support potential future 3D sound systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Stereophonic Arrangements (AREA)
  • Headphones And Earphones (AREA)

Abstract

The multichannel headphones serve for high-quality reproduction of three-dimensional sound at home, with the ability to adjust the volume at a comfortable level. The multichannel headphones comprise 6 small loudspeakers (Type 1), namely 16, 21, 26 or more small loudspeakers (Type 2) that are built-in each earphone, individual reproducing sound channels that each have their own air chambers (7-12), a plastic housing (13), cylindrical sponge (14) padded earcups that rest on the ears, as well as a cord (15) that embodies all of the loudspeakers' outputs. All of the aforementioned leads to the invention of universal headphones that are compatible with all multichannel sound systems and thus can be used for enjoying realistic three dimensional sounds from various audio sources.

Description

MULTICHANNEL HEADPHONES
1. FIELD OF THE INVENTION
The present invention relates to multichannel headphones consisting of six (6) small loudspeakers (Type 1), namely sixteen (16) or more small loudspeakers (Type 2) that are fitted into each earphone. According to the International Patent Classification (IPC) this invention is classified under H04R1 - loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical tansducers, specifically H04R1/10 - earpieces.
2. TECHNICAL PROBLEMS Lately we are witnesses of technical advances in the field of multimedia in general and especially in the audio and video techniques. One of the multimedia components is the three-dimensional (3D) sound system which aim is to deliver natural sound images to the listener. The delivery of the natural sound sensation to the listener is achieved through several separate sound channels. The 3D sound is especially important for DVD and VHS home theatre systems, high resolution televisions, PC games, game consoles as well as for a myriad of multimedia systems that will be devised in the future. Since the development and evolution of the multichannel sound proceeded gradually, it resulted in the rise of many multisound reproduction standards/systems. Up until now, there were no difficulties in meeting the different reproduction standards, since multichannel sound was reproduced through loudspeakers. The challenge was to devise headphones that can reproduce high quality multichannel sound from the majority of the registered standardized sound sources, such as: 2.0 (Stereo), 4.0 (Dolby Surround), 5.0 (Dolby Pro-Logic Surround), 5.1 (Dolby Digital Surround and DTS), 6.1 (DTS-ES and THX-EX), 7.1 (THX-EX). It is also very hard to devise headphones that can reproduce sounds coming from above or below the user ("vertical surround sound").
3. DESCRIPTION OF THE PRIOR ART
Currently, there are no known single solutions to the above described problem. There are similar solutions (patents JP63318900 and JP1314098), but the offered headphones have a maximum of two built-in loudspeakers in each earphone. These headphones can reproduce sound only from certain, above mentioned, standardized sound sources. In certain cases, digital signal processing techniques were used to create the 3D sound, but to no avail, since the sound that was reproduced sounded artificial, thus the headphones could not be used for realistically conveying the sound of a live performance event, but only for computer games. As far as reproducing "vertical surround sound" for which Type 2 earphones are used, presently there is no solution offered.
4. SUMMARY OF THE INVENTION
The primary aim of this invention is to devise universal headphones that deliver a natural three-dimensional sensation and that are compatible with all known multichannel sound standards (Type 1) as well as universal headphones that in addition reproduce 3D vertical surround sound (Type 2).
The secondary aim of this invention is to devise universal headphones that can reproduce sounds from as many as possible multimedia systems. Further, another object of the present invention is to devise headphones for privately enjoying realistic 3D sounds. A headphone system capable of being listened to by a person in private, at home, with the ability to adjust the volume at a comfortable level. The headphones in this invention consist of 6 small loudspeakers (Type 1), namely 16 or more loudspeakers (Type 2) that are built-in each earphone, individual reproducing sound channels that each have their own air chambers, a plastic housing that connects all the chambers, cylindrical sponge padded earcups that rest on the ears, as well as a multi-wire cord that connects the earphones to the audio amplifier. All the loudspeakers have separate electric outputs. The loudspeakers are connected to the audio amplifier with corresponding couplings in order to reproduce a 3D sound of a certain standard/system.
5. SHORT DESCRIPTION OF THE DRAWINGS
Figure 1 shows the top view of the right headphone. The letter N for nose shows the direction the head is facing. This figure shows the Type 1 earphone. Figure 2 shows the spatial view of the Type 1 right earphone with the corresponding loudspeakers and other earphone components.
Figure 3 shows the spatial view of the Type 2 right earphone with 16 corresponding loudspeakers as well as all the other earphone components.
6) DETAILED DESCRIPTION OF AT LEAST ONE OF THE PREFERRED EMBODIMENT As seen in Figure 1 , the Type 1 right earphone consists of 6 loudspeakers 1 , 2, 3, 4, 5 and 6. Loudspeakers 1 , 2, 3, 4, and 5 are identical and cover a wide range of frequencies. Together with the corresponding air chambers, these loudspeakers are aligned with the ear opening (U), and are arranged symmetrically in the direction of the ear opening. The sixth loudspeaker is slightly larger and it is a low-frequency loudspeaker. Its position is of no critical importance. It can be placed anywhere within the earphone housing (13). Right and left earphone speakers 1 represent the central loudspeakers for the 3D sound. Right and left earphone speakers 2 represent the front right namely front left speakers for the 3D sound. Right and left earphone speakers 3 represent the right surround, namely left surround loudspeakers. Right and left earphone speakers 5 represent the right rear, namely left rear surround loudspeakers. Right and left earphone speakers 4 are not intended for reproducing present 3D sounds but are reserved for future systems. Right and left earphone loudspeakers 6 represent the low-frequency speakers - subwoofer.
Figure 2 shows the dome-shaped earphone housing that has thick and hollow walls, which serve as air chambers for the loudspeakers. Each loudspeaker has its own air chamber. The air chambers are marked in Figure 1 as 7, 8, 9, 10, 11 and 12. The structure of the Type 2 earphone is similar to the Type 1 earphone except that here instead of a single line of loudspeakers there are three stacks of loudspeakers. Instead of loudspeaker 1 there are loudspeakers 1A, 1B, 1C with corresponding three chambers. The same is with loudspeakers 2, 3, 4 and 5. Instead of loudspeakers 2, 3, 4 and 5 there are loudspeakers 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B, 4C, 5A, 5B and 5C. There is still only one loudspeaker 6 and thus there are altogether 16 loudspeakers. This arrangement of the loudspeakers enables all combinations as in the Type 1 earphone, except that here the reproduction of the "vertical" 3D sound can be achieved, e.g. we can actually hear an airplane descending and landing on the runway. The Figure shows an earphone with loudspeakers stacked in three rows. However, earphones with 4, 5 and more rows of loudspeakers can be made in which case the reproduction of the 3D sound would be even more realistic. In such case, the total number of loudspeakers would be 21 , 26 or more. All Type 1 and Type 2 earphones have their own electric outputs that are coupled to the audio amplifier channels by means of a multi-wire cord (15).
In order to avoid getting a distorted sound and a distorted sound image, a cylindrical sponge pad 14 (Figure 1) is placed between the earphone housing and the head. The sponge pads are not shown in Figure 2 in order to get a better view of the other details. The headband portion (Figure 2) is used for connecting the left and right earphones. A self-adjusting headband mechanism that ensures a personalized fit can be added.
7. INVENTION APPLICATION The present invention is a practical and useful audio apparatus, which may be easily and efficiently manufactured and marketed. It includes significant improvements as compared to the existing versions. The invention may readily be utilized because of its universal quality, namely it can be used in combination with more than one audio source and it can replace almost all of the currently known similar headphone apparatuses. Simple changes and modifications, i.e. including more speakers make it possible for this apparatus to support potential future 3D sound systems.

Claims

CLAIMSWhat is claimed is:
1. Multichannel headphones consisting of several small loudspeakers for each ear, each having separate sound channels with their own air chambers, a plastic housing that connects all the chambers, cylindrical sponge pads that are fitted to the ears, a metal headband that connects both earphones, and a multi-wire cord that connects the earphones to the audio amplifier, wherein each earphone has 6 built-in small loudspeakers (Type 1.)
2. Multichannel headphones consisting of several small loudspeakers for each ear, each having separate sound channels with their own air chambers, a plastic housing that connects all the chambers, cylindrical sponge pads that are fitted to the ears, a metal headband that connects both earphones, and a multi-wire cord that connects the earphones to the audio amplifier, wherein each earphone has 16, 21, 26 or more built-in small loudspeakers (Type 2.)
3. The multichannel headphones of claim 1, wherein each of the 6 speakers have separate outputs that make them compatible with all known 3D sound systems.
4. The multichannel headphones of claim 2, wherein each of the 16, 21 , 26 or more loudspeakers have separate outputs that make them compatible with all known 3D sound systems.
PCT/HR2003/000055 2002-10-31 2003-10-29 Multichannel headphones WO2004040941A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003274386A AU2003274386A1 (en) 2002-10-31 2003-10-29 Multichannel headphones

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HR20020861A HRP20020861A2 (en) 2002-10-31 2002-10-31 Multichannel headphones
HRP20020861A 2002-10-31

Publications (1)

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WO2004040941A1 true WO2004040941A1 (en) 2004-05-13

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HR (1) HRP20020861A2 (en)
WO (1) WO2004040941A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005043952A1 (en) * 2003-10-31 2005-05-12 Nokia Corporation Sound generating transducer
DE102006059197A1 (en) * 2006-08-23 2008-03-13 Cotron Corp. earphones
GB2486688A (en) * 2010-12-22 2012-06-27 Wolfson Microelectronics Plc Speaker system using several low-frequency loudspeakers around a high-frequency loudspeaker
JP2012178748A (en) * 2011-02-25 2012-09-13 Sony Corp Headphone device and sound reproduction method of the same
US20150055814A1 (en) * 2013-03-05 2015-02-26 Mao-Liang Liu Headphone for reproducing sound stage effect
US9786261B2 (en) 2014-12-15 2017-10-10 Honeywell International Inc. Active noise reduction earcup with speaker array
US9820029B2 (en) 2015-04-17 2017-11-14 Blackberry Limited Device-adaptable audio headset
US20180192228A1 (en) * 2017-01-04 2018-07-05 Harman Becker Automotive Systems Gmbh Arrangements and methods for generating natural directional pinna cues
DE102017118815A1 (en) * 2017-08-17 2019-02-21 USound GmbH Speaker assembly and headphones for spatially locating a sound event
IT202000005299A1 (en) * 2020-03-12 2021-09-12 Alessandro Verdoliva Device and method for three-dimensional sound reproduction
RU208001U1 (en) * 2021-05-17 2021-11-29 Николай Анатольевич Сныткин Spatial sound positioning headphones
EP3935867A4 (en) * 2019-03-06 2022-11-23 Turgut, Mehmet Tunç Over-ear headphones having speaker units equipped with surround sound members
WO2022245251A1 (en) * 2021-05-17 2022-11-24 Николай СНЫТКИН Earphones with spatial positioning of sound

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05336599A (en) * 1992-06-03 1993-12-17 Fujitsu Ltd Sound image localization headphone device and virtual reality audio-visual equipment using it
US5684879A (en) * 1996-01-19 1997-11-04 Verdick; Michael Combination head mounted speaker assembly and multi-channel audio processing system
US6038330A (en) * 1998-02-20 2000-03-14 Meucci, Jr.; Robert James Virtual sound headset and method for simulating spatial sound
US6263085B1 (en) * 1999-07-01 2001-07-17 Sergio W. Weffer Surround sound headphones

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05336599A (en) * 1992-06-03 1993-12-17 Fujitsu Ltd Sound image localization headphone device and virtual reality audio-visual equipment using it
US5684879A (en) * 1996-01-19 1997-11-04 Verdick; Michael Combination head mounted speaker assembly and multi-channel audio processing system
US6038330A (en) * 1998-02-20 2000-03-14 Meucci, Jr.; Robert James Virtual sound headset and method for simulating spatial sound
US6263085B1 (en) * 1999-07-01 2001-07-17 Sergio W. Weffer Surround sound headphones

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 167 (E - 1528) 22 March 1994 (1994-03-22) *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005043952A1 (en) * 2003-10-31 2005-05-12 Nokia Corporation Sound generating transducer
US6995659B2 (en) 2003-10-31 2006-02-07 Nokia Corporation Sound generating transducer
DE102006059197A1 (en) * 2006-08-23 2008-03-13 Cotron Corp. earphones
US8180089B2 (en) 2006-08-23 2012-05-15 Cotron Corporation Earphone
GB2486688A (en) * 2010-12-22 2012-06-27 Wolfson Microelectronics Plc Speaker system using several low-frequency loudspeakers around a high-frequency loudspeaker
JP2012178748A (en) * 2011-02-25 2012-09-13 Sony Corp Headphone device and sound reproduction method of the same
US20150055814A1 (en) * 2013-03-05 2015-02-26 Mao-Liang Liu Headphone for reproducing sound stage effect
US9786261B2 (en) 2014-12-15 2017-10-10 Honeywell International Inc. Active noise reduction earcup with speaker array
US9820029B2 (en) 2015-04-17 2017-11-14 Blackberry Limited Device-adaptable audio headset
US20180192228A1 (en) * 2017-01-04 2018-07-05 Harman Becker Automotive Systems Gmbh Arrangements and methods for generating natural directional pinna cues
US10559291B2 (en) * 2017-01-04 2020-02-11 Harman Becker Automative Systems Gmbh Arrangements and methods for generating natural directional pinna cues
DE102017118815A1 (en) * 2017-08-17 2019-02-21 USound GmbH Speaker assembly and headphones for spatially locating a sound event
US11146874B2 (en) 2017-08-17 2021-10-12 USound GmbH Loudspeaker assembly and headphones for spatially localizing a sound event
EP3935867A4 (en) * 2019-03-06 2022-11-23 Turgut, Mehmet Tunç Over-ear headphones having speaker units equipped with surround sound members
IT202000005299A1 (en) * 2020-03-12 2021-09-12 Alessandro Verdoliva Device and method for three-dimensional sound reproduction
WO2021181174A1 (en) * 2020-03-12 2021-09-16 Verdoliva Alessandro Device and method for three-dimensional sound reproduction
RU208001U1 (en) * 2021-05-17 2021-11-29 Николай Анатольевич Сныткин Spatial sound positioning headphones
WO2022245251A1 (en) * 2021-05-17 2022-11-24 Николай СНЫТКИН Earphones with spatial positioning of sound

Also Published As

Publication number Publication date
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HRP20020861A2 (en) 2005-02-28

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