| 查看: 134 | 回复: 1 | |||
| 当前主题已经存档。 | |||
yuwenxianglong铁杆木虫 (正式写手)
|
[交流]
TRANSFORMS-WAVELETS
|
||
|
傅立叶变换和小波分析处理噪声的朋友不妨可以参考一下。 Transform Analysis Signal processing using a transform analysis for calculations is a technique used to simplify or accelerate problem solution. For example, instead of dividing two large numbers, we might convert them to logarithms, subtract them, then look-up the anti-log to obtain the result. While this may seem a three-step process as opposed to a one-step division,consider that long-hand division of a four digit number by a three digit number, carried out to four places requires three divisions, 3-4 multiplication*s, and three subtractions. Computers process additions or subtractions much faster than multiplications or divisions, so transforms are sought which provide the desired signal processing using these steps. Fourier Transform Other types of transforms include the Fourier transform, which is used to decompose or separate a waveform into a sum of sinusoids of different frequencies. It transforms our view of a signal from time based to frequency based. Figure 1 depicts how a square wave is formed by summing certain particular sine waves. The waveform must be continuous, periodic,and almost everywhere differentiable. The Fourier transform of a sequence of rectangular pulses is a series of sinusoids. The envelope of the amplitude of the coefficients of this series is a waveform with a Sin X/X shape. For the special case of a single pulse, the Fourier series has an infinite series of sinusoids that are present for the duration of the pulse. |
回复此楼» 猜你喜欢
科研求助
已经有4人回复
-
博士去二本高校当辅导员，如何调整心态？
已经有11人回复
-
面上有专家说实验设备不是我们单位的
已经有6人回复
-
江苏省自然基金 什么时候出结果
已经有6人回复
-
广西大学-广州大学招聘博士后 欢迎广大优秀人才！！！
已经有11人回复
-
闲聊
已经有3人回复
-
初秋的晨风
已经有6人回复
1
 |
2楼2006-05-28 08:02:45