Audio test apparatus capable of decreasing noise influence...

Details Audio test apparatus capable of decreasing noise influence... Audio test apparatus capable of decreasing noise influence...

2008-07-02

2011-11-01

Pizarro Crespo, Marcos D (Department: 2814)

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

C381S103000, C704S226000

Reexamination Certificate

active

08050422

ABSTRACT:
A audio test method for decreasing noise influence, which includes the following steps: obtaining analog signals; converting the analog signals into digital signals; intercepting digital signals of a first predetermined length and executing a first Fast Fourier Transform (FFT), then obtaining an first Fourier spectrum; recording the amplitudes of frequency values of the first Fourier spectrum; intercepting digital signals of a second predetermined length and executing the second FFT, then obtaining an second Fourier spectrum; recording the amplitudes of the frequency values belonging to odd points of the second frequency spectrum, which are the amplitudes of the noise composition; subtracting the amplitudes of the noise composition from the amplitudes of frequency values of the first Fourier spectrum and obtaining a frequency domain signals without noise composition; executing inverse Fast Fourier Transform (iFFT) for the frequency domain signals and obtaining time domain signals, testing each parameter of the time domain signals.

REFERENCES:
patent: 5799270 (1998-08-01), Hasegawa
patent: 7043030 (2006-05-01), Furuta
patent: 2005/0228660 (2005-10-01), Schweng

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