The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 2010
Filed:
Nov. 14, 2002
Matti Karjalainen, Espoo, FI;
Aki Mäkivirta, Lapinlahti, FI;
Poju Antsalo, Helsinki, FI;
Vesa Välimäki, Espoo, FI;
Matti Karjalainen, Espoo, FI;
Aki Mäkivirta, Lapinlahti, FI;
Poju Antsalo, Helsinki, FI;
Vesa Välimäki, Espoo, FI;
Genelec Oy, Iisalmi, FI;
Abstract
In a room with strong low-frequency modes the control of excessively long decays is problematic or impossible with conventional passive means. In this patent application a systematic methodology is presented for active modal equalization able to correct the modal decay behaviour of a loudspeaker-room system. Two methods of modal equalization are proposed. The first method modifies the primary sound such that modal decays are controlled. The second method uses separate primary and secondary radiators and controls modal decays with sound fed into at least one secondary radiator. Case studies of the first method of implementation are presented.