Processing

Please wait...

Settings

Settings

Goto Application

1. WO1997025834 - METHOD AND DEVICE FOR PROCESSING A MULTI-CHANNEL SIGNAL FOR USE WITH A HEADPHONE

Publication Number WO/1997/025834
Publication Date 17.07.1997
International Application No. PCT/US1997/000145
International Filing Date 03.01.1997
Chapter 2 Demand Filed 01.08.1997
IPC
H04S 3/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS
3Systems employing more than two channels, e.g. quadraphonic
H04S 7/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS
7Indicating arrangements; Control arrangements, e.g. balance control
CPC
H04R 29/001
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
29Monitoring arrangements; Testing arrangements
001for loudspeakers
H04S 2400/01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
2400Details of stereophonic systems covered by H04S but not provided for in its groups
01Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
H04S 2420/01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
2420Techniques used stereophonic systems covered by H04S but not provided for in its groups
01Enhancing the perception of the sound image or of the spatial distribution using head related transfer functions [HRTF's] or equivalents thereof, e.g. interaural time difference [ITD] or interaural level difference [ILD]
H04S 3/004
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
3Systems employing more than two channels, e.g. quadraphonic
002Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
004For headphones
H04S 3/008
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
3Systems employing more than two channels, e.g. quadraphonic
008in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
H04S 7/30
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
7Indicating arrangements; Control arrangements, e.g. balance control
30Control circuits for electronic adaptation of the sound field
Applicants
  • VIRTUAL LISTENING SYSTEMS, INC. [US]/[US] (AllExceptUS)
  • TUCKER, Timothy, J. [US]/[US] (UsOnly)
  • GREEN, David, M. [US]/[US] (UsOnly)
Inventors
  • TUCKER, Timothy, J.
  • GREEN, David, M.
Agents
  • BENCEN, Gerard, H.
Priority Data
08/582,83004.01.1996US
08/726,51807.10.1996US
08/726,59007.10.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND DEVICE FOR PROCESSING A MULTI-CHANNEL SIGNAL FOR USE WITH A HEADPHONE
(FR) PROCEDE ET DISPOSITIF DE TRAITEMENT D'UN SIGNAL MULTICANAL DESTINE A UN CASQUE AUDIO
Abstract
(EN)
A method and device processes multi-channel audio signals, each channel corresponding to a loudspeaker placed in a particular location in a room, in such a way as to create, over headphones, the sensation of multiple 'phantom' loudspeakers placed throughout the room. Head Related Transfer Functions (HRTFs) are chosen according to the elevation and azimuth of each intended loudspeaker relative to the listener, each channel being filtered with an HRTF such that when combined into left and right channels and played over headphones, the listener senses that the sound is actually produced by phantom loudspeakers placed throughout the 'virtual' room. A database collection of sets of HRTF coefficients from numerous individuals and subsequent matching of the best HRTF set to the individual listener provides the listener with listening sensations similar to that which the listener, as an individual, would experience when listening to multiple loudspeakers placed throughout the room. An appropriate transfer function applied to the right and left channel output allows the sensation of open-ear listening to be experienced through closed-ear headphones.
(FR)
La présente invention concerne un procédé et un dispositif de traitement de signaux audio multicanaux, chaque canal correspondant à un haut-parleur disposé en un point particulier une pièce de façon à donner, via un casque audio, l'impression que de multiples de haut-parleurs 'fantômes' sont répartis dans la pièce. On sélectionne des fonctions HRTF de transfert par rapport à la tête $i((Head Related Transfer Functions)) en prenant en considération la hauteur et l'azimut de chaque haut-parleur considéré par rapport à l'auditeur. Chaque canal fait l'objet d'un filtrage HRTF de sorte que, lorsque ces canaux sont combinés dans les canaux gauche et droit et restitués par un casque audio, l'auditeur a l'impression que le son provient effectivement de haut-parleurs fantômes répartis dans la pièce virtuelle. Des jeux de coefficients HRTF saisis en base de données à partir d'un grand nombre d'individus et l'utilisation pour l'auditeur concerné d'un jeu HRTF optimal lui fournit des impressions d'écoute semblables à celle qu'aurait un auditeur isolé s'il écoutait de multiples haut-parleurs répartis dans le volume d'un local. L'application d'une fonction HRTF à la sortie des canaux droit et gauche permet, dans le cas d'une écoute au casque, de donner l'impression d'une écoute sans casque.
Also published as
Latest bibliographic data on file with the International Bureau