可逆离散听觉变换
An Invertible Discrete Auditory Transform
AI总结:
提出一种可逆的离散听觉变换(DAT),其频谱比离散傅里叶变换(DFT)更平滑,且在语音去噪测试中信噪比(SNR)比DFT高5-7分贝。
摘要:
提出了一种从声音信号到频谱的离散听觉变换(DAT),并证明其具有闭式可逆性。该变换保持能量,其频谱比离散傅里叶变换(DFT)更平滑,符合人类听觉特性。在采用频谱阈值法的信号去噪测试中,将DAT与DFT进行了比较。信号为含噪语音片段。结果表明,除噪声水平相对较低的情况外,DAT的信噪比(SNR)比DFT高5至7分贝(dB)。
英文摘要:
A discrete auditory transform (DAT) from sound signal to spectrum is presented and shown to be invertible in closed form. The transform preserves energy, and its spectrum is smoother than that of the discrete Fourier transform (DFT) consistent with human audition. DAT and DFT are compared in signal denoising tests with spectral thresholding method. The signals are noisy speech segments. It is found that DAT can gain 5 to 7 decibel (dB) in signal to noise ratio (SNR) over DFT except when the noise level is relatively low.
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