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1. WO1997037512 - SIX-AXIS SURROUND SOUND PROCESSOR WITH IMPROVED MATRIX AND CANCELLATION CONTROL

Publication Number WO/1997/037512
Publication Date 09.10.1997
International Application No. PCT/US1997/003849
International Filing Date 14.03.1997
Chapter 2 Demand Filed 22.09.1997
IPC
H04S 3/02 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS
3Systems employing more than two channels, e.g. quadraphonic
02of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
H04S 5/00 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS
5Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
CPC
H04S 3/02
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
3Systems employing more than two channels, e.g. quadraphonic
02of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other
H04S 5/005
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
5Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
005of the pseudo five- or more-channel type, e.g. virtual surround
H04S 7/301
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
7Indicating arrangements; Control arrangements, e.g. balance control
30Control circuits for electronic adaptation of the sound field
301Automatic calibration of stereophonic sound system, e.g. with test microphone
H04S 7/40
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
7Indicating arrangements; Control arrangements, e.g. balance control
40Visual indication of stereophonic sound image
Applicants
  • HARMAN INTERNATIONAL INDUSTRIES, INC. [US]/[US]
Inventors
  • FOSGATE, James, Wayne
Agents
  • McCOMBS, David, L.
Priority Data
08/631,60302.04.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SIX-AXIS SURROUND SOUND PROCESSOR WITH IMPROVED MATRIX AND CANCELLATION CONTROL
(FR) PROCESSEUR ACOUSTIQUE D'AMBIANCE A SIX AXES AVEC MATRICE PERFECTIONNEE ET COMMANDE D'ANNULATION
Abstract
(EN)
A surround sound processor (1) for redistribution of stereophonic audio signals (2, 4) into multiple channels for presentation on a plurality of loudspeakers surrounding a listener has an improved direction detector filter circuit (8), a peak hold circuit in the direction detector for better dynamic separation, improved time constants in the servologic circuit (16), improved linearity correction in the control voltage generator (18-28) to match the characteristics of the new voltage controlled amplifiers (32-40) which are applied to the separation matrix (30), a separation matrix (30) having cancellation of unwanted signals without gain modification for desired signal components, and improved shelf filters in the rear channel outputs.
(FR)
La présente invention concerne un processeur acoustique d'ambiance (1) pour la redistribution des signaux acoustiques en stéréophonie (2, 4) à travers plusieurs canaux pour la mise en valeur d'un ensemble de haut-parleurs entourant un dispositif d'écoute. Ledit processeur possède un circuit de filtrage perfectionné (8), un circuit de maintient des pointes dans le détecteur de direction pour une meilleure séparation dynamique, de meilleures constantes de temps dans le circuit de réglage (16), une correction de linéarité améliorée dans le générateur de commande de tensions (18-20) pour répondre aux nouvelles caractéristiques des amplificateurs des tensions contrôlées (32-40) qui sont appliquées à la matrice de séparation (30), une matrice de séparation (30) pourvue d'un dispositif de contrôle des signaux parasites sans modification du gain pour les éléments de signaux voulus et des filtres dormants perfectionnés à l'arrière des sorties de canaux.
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