Apparatus for adjustable positioning of virtual sound source

Details Apparatus for adjustable positioning of virtual sound source Apparatus for adjustable positioning of virtual sound source

2006-09-26

2006-09-26

Swerdlow, Daniel (Department: 2615)

Electrical audio signal processing systems and devices

Binaural and stereophonic

Pseudo stereophonic

C381S086000, C381S310000

Reexamination Certificate

active

07113602

ABSTRACT:
An acoustic apparatus comprises an attenuator for attenuating a first audio signal to produce a second audio signal, a low pass filter for reducing high frequency components of the second audio signal to produce a third audio signal, a differential amplifier operative to produce a fourth audio signal corresponding to a difference between the first and third audio signals, and a speaker supplied with the fourth audio signal obtained from the differential amplifier, wherein a cutoff frequency of the low pass filter is selected to be not lower than 2 kHz and not higher than 6 kHz and attenuation of the first audio signal in the attenuator is so selected that a listener is able to recognize a virtual sound source position in front of and at a level higher than an actual position of the speaker.

REFERENCES:
patent: 4438414 (1984-03-01), Blachot
patent: 4622691 (1986-11-01), Tokumo et al.
patent: 4980914 (1990-12-01), Kunugi et al.
patent: 5850453 (1998-12-01), Klayman et al.
patent: 6108430 (2000-08-01), Kurisu
patent: 2001/0031054 (2001-10-01), Grimani

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