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1. WO2000042818 - A STEREOPHONIC SPATIAL EXPANSION CIRCUIT WITH TONAL COMPENSATION AND ACTIVE MATRIXING

Publication Number WO/2000/042818
Publication Date 20.07.2000
International Application No. PCT/US1999/029938
International Filing Date 15.12.1999
Chapter 2 Demand Filed 28.07.2000
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
CPC
H04S 1/002
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
1Two-channel systems
002Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution
H04S 7/307
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
SSTEREOPHONIC SYSTEMS 
7Indicating arrangements; Control arrangements, e.g. balance control
30Control circuits for electronic adaptation of the sound field
307Frequency adjustment, e.g. tone control
Applicants
  • THOMSON LICENSING S.A. [FR/FR]; 46, quai A. Le Galo F-92648 Boulogne Cédex, FR (AllExceptUS)
  • HOOVER, Alan, Anderson [US/US]; US (UsOnly)
Inventors
  • HOOVER, Alan, Anderson; US
Agents
  • TRIPOLI, Joseph, S. ; Thomson Multimedia Licensing Incorporated P.O. Box 5312 Princeton, NJ 08543, US
Priority Data
60/115,32411.01.1999US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A STEREOPHONIC SPATIAL EXPANSION CIRCUIT WITH TONAL COMPENSATION AND ACTIVE MATRIXING
(FR) CIRCUIT D'EXPANSION SPATIALE STEREOPHONIQUE A COMPENSATION TONALE ET MATRIÇAGE ACTIF
Abstract
(EN)
In a stereophonic expansion circuit, the (L+R) sum signal is spectrally modified by increasing the bass and treble frequencies relative to the midrange so as to compensate for a midrange frequency boost in the (L-R) difference signal. The stereophonic expansion effect and manipulation of the signal parameters are produced by active matrixing amplifiers.
(FR)
L'invention concerne un circuit d'expansion stéréophonique dans lequel le signal de la somme (L+R) est spectralement modifié par l'augmentation des fréquences des graves et des aigus par rapport aux médiums, de façon à compenser une amplification de fréquence des médiums dans le signal de la différence (L-R). L'effet d'expansion stéréophonique et la manipulation des paramètres des signaux sont obtenus au moyen d'amplificateurs de matriçage actifs.
Also published as
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