公开(公告)号：US06601206B1

公开(公告)日：2003-07-29

申请号：US09447026

申请日：1999-11-22

申请人： Farokh Alim Marvasti

发明人： Farokh Alim Marvasti

IPC分类号： H03M1347

CPC分类号： H03M13/6312 ,  H03M13/6536

摘要： A method of error concealment or correction, suitable for signals such as speech, image and video signals, and particularly for such signals as transmitted over wireless and ATM channels. The method has improved stability for large block sizes and bunched errors. It is based on a modification of the discrete Fourier transform which is equivalent to a permutation of the Fourier coefficients. Thus, as with the conventional Fourier transform, setting a contiguous set of coefficients equal to zero in the transmitted signal enables error concealment techniques to be used at the receiver. However, with the modified transform, the zeroes are not bunched together in the spectrum, so the instability problems that arise when the conventional Fourier transform is used are mollified, and much larger block sizes can be used.

摘要翻译： 一种错误隐藏或校正的方法，适用于诸如语音，图像和视频信号之类的信号，特别是对于通过无线和ATM信道传输的信号。 该方法提高了大块大小和聚束误差的稳定性。 它是基于等价于傅里叶系数的置换的离散傅立叶变换的修改。 因此，与传统的傅里叶变换一样，在发送信号中设置等于零的连续的系数集合使得能够在接收机处使用错误隐藏技术。 然而，通过修改的变换，零谱不在光谱中聚束在一起，因此使用常规傅立叶变换时出现的不稳定性问题被减弱，并且可以使用更大的块大小。