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    • 2. 发明申请
    • AUDIO TEST APPARATUS CAPABLE OF DECREASING NOISE INFLUENCE IN PROCESS OF AUDIO DEVICE TESTING AND METHOD THEREOF
    • 在音频设备测试过程中减少噪声影响的音频测试设备及其方法
    • US20090028357A1
    • 2009-01-29
    • US12166332
    • 2008-07-02
    • YAO ZHAOHAI-SHENG LIHUA-DONG CHENGWEN-CHUAN LIANHAN-CHE WANGKUAN-HONG HSIEH
    • YAO ZHAOHAI-SHENG LIHUA-DONG CHENGWEN-CHUAN LIANHAN-CHE WANGKUAN-HONG HSIEH
    • H04B15/00
    • H04R29/001H04R2499/11
    • 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 Flourier Transform (iFFT) for the frequency domain signals and obtaining time domain signals, testing each parameter of the time domain signals.
    • 一种用于降低噪声影响的音频测试方法,包括以下步骤:获取模拟信号; 将模拟信号转换为数字信号; 截取第一预定长度的数字信号并执行第一快速傅里叶变换(FFT),然后获得第一傅立叶频谱; 记录第一傅立叶频谱的频率值的振幅; 截取第二预定长度的数字信号并执行第二FFT,然后获得第二傅立叶频谱; 记录属于作为噪声组成的振幅的第二频谱的奇数点的频率值的振幅; 从第一傅立叶频谱的频率值的幅度减去噪声组成的振幅,并获得无噪声组成的频域信号; 对频域信号执行反快速Flourier变换(iFFT),并获取时域信号,测试时域信号的每个参数。
    • 3. 发明申请
    • AUDIO TEST APPARATUS AND TEST METHOD THEREOF
    • 音频测试装置及其测试方法
    • US20090052678A1
    • 2009-02-26
    • US12168916
    • 2008-07-08
    • HUA-DONG CHENGWEN-CHUAN LIANYAO ZHAOJIAN SUNPENG CHENWEN-SHENG TSAI
    • HUA-DONG CHENGWEN-CHUAN LIANYAO ZHAOJIAN SUNPENG CHENWEN-SHENG TSAI
    • H04R29/00
    • H04R29/001
    • An audio test apparatus, and an exemplary audio test method that includes: processing an audio file through two independent channels; outputting no signals from a left channel and from a right channel in a first time period; receiving noise signals from the left and right channels; outputting single-frequency signals from the left channel only in a second time period; receiving the single-frequency signals from the left channel and crosstalk signals from the right channel; outputting multi-frequency signals from the left and right channels in a third time period; receiving the multi-frequency signals from the left and right channels; outputting single-frequency signals from the right channel only in a fourth time period; receiving the crosstalk signals from the left channel and the single-frequency signals from the right channel; and testing parameters according to the signals received during the four time periods.
    • 音频测试装置和示例性音频测试方法,其包括:通过两个独立信道处理音频文件; 在第一时间段内不从左声道和右声道输出信号; 从左右声道接收噪声信号; 仅在第二时间段内从左声道输出单频信号; 从左声道接收单频信号和来自右声道的串扰信号; 在第三时间段内从左右声道输出多频信号; 从左右声道接收多频信号; 仅在第四时间段内从右声道输出单频信号; 接收来自左声道的串扰信号和来自右声道的单频信号; 并根据在四个时间段期间接收的信号测试参数。