Stereo sound circuit device for providing three-dimensional...

Details Stereo sound circuit device for providing three-dimensional... Stereo sound circuit device for providing three-dimensional...

2006-02-14

2006-02-14

Tran, Sinh (Department: 2644)

Electrical audio signal processing systems and devices

Binaural and stereophonic

C381S017000, C381S018000, C381S098000

Reexamination Certificate

active

06999590

ABSTRACT:
A stereo sound circuit device for providing three-dimensional surrounding effect has a difference circuit for acquiring difference signal of a left channel sound and a right channel sound. The stereo sound circuit device further provides a filter circuit consisting of a first and a second filtering operation units for applying a first and second filtering functions to the difference signal output from the difference circuit for generating a three-dimensional surrounding sound signal. The first filtering function implements a band pass filter with a central frequency of about 7.23 KHz. The second filtering function implements a band pass filter with a central frequency of about 318 Hz. A signal level adjust circuit is provided for adjusting the signal level of the sound signal output from the filter circuit. A mixer is provided for combining the adjusted three-dimensional surrounding sound with the original left channel sound and right channel sound.

REFERENCES:
patent: 4394536 (1983-07-01), Shima et al.
patent: 5384851 (1995-01-01), Fujimori
patent: 5657391 (1997-08-01), Jyosako
patent: 6498856 (2002-12-01), Itabashi et al.
patent: 6597791 (2003-07-01), Klayman

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