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:
Jul. 18, 2000
Filed:
Dec. 13, 1996
Kabushiki Kaisha Kawai Gakki Seisakusho, Shizuoka-ken, JP;
Abstract
A virtual sound source positioning apparatus includes a channel signal generating section for generating first and second channel signals, a first component signal indicative of a component of the first channel signal, and a second component signal indicative of a component of the second channel signal from an audio input signal, a control section including a low pass filter, for generating a difference signal associated with a difference between the first component signal and the second component signal, filtering the difference signal by the low pass filter to generate a filtered difference signal, and for generating a first audio image control signal from the filtered difference signal and the first channel signal, and a second audio image control signal from the second channel signal and the filtered difference signal, and a sound output section for positioning a virtual sound source in accordance with the first and second audio image control-signals. The difference signal may be generated by multiplying the first and second component signals by predetermined coefficients, and the filtered difference signal may be delayed in accordance with the difference signal transfer paths to the ears of a listener. The first and second channel signals can be generated using two head acoustic transfer functions. In this case, an IIR-type filter is used to generate a direct sound signal and an IIR-type filter and a FIR-type filter connected thereto in series are used to generate a reflection signal.