发明名称 |
Audio test apparatus capable of decreasing noise influence in process of audio device testing and method thereof |
摘要 |
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.
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申请公布号 |
US8050422(B2) |
申请公布日期 |
2011.11.01 |
申请号 |
US20080166332 |
申请日期 |
2008.07.02 |
申请人 |
HONG FU JIN PRECISION INDUSTRY (SHENZHEN) CO., LTD.;HON HAI PRECISION INDUSTRY CO., LTD. |
发明人 |
ZHAO YAO;LI HAI-SHENG;CHENG HUA-DONG;LIAN WEN-CHUAN;WANG HAN-CHE;HSIEH KUAN-HONG |
分类号 |
H04B15/00 |
主分类号 |
H04B15/00 |
代理机构 |
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