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:
Sep. 27, 2005
Filed:
Jun. 22, 2001
Philip Arthur Nelson, Romsey, GB;
Takashi Takeuchi, Tokyo, JP;
Philip Arthur Nelson, Romsey, GB;
Takashi Takeuchi, Tokyo, JP;
Adaptive Audio Limited, Romsey, GB;
Abstract
A sound reproduction system has pairs of sound emitters that subtend different angles Θ, the span angle, at the listener position. The pairs of sound emitters are arranged to be excited by different frequency bands of the signal output from an inverse filter means (H, H). The operational span-frequency range of the pairs of sound emitters is determined by an equation (I) where the transducer span Θ is the angle subtended at the listener by a pair of transducers, where O<n<2. c: is the speed of sound, and Δr: is the equivalent distance between the ears. The sound emitters may be discrete speaker units, the different pairs of units being positioned at different span angles, or they be constituted by area portions of an extended transducer (FIG.). When discrete speaker units are employed a cross-over filter (FIG.) is used to provide drive signals in the different frequency bands to the different speaker pairs. When an extended transducer is employed, the vibration transmission characteristics of the transducer may be arranged to filter the vibrations transmitted along the transducer from an excitation means positioned at the higher frequency emitting end of the transducer.