| 查看: 124 | 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
今天基金会出结果吗？20260819
已经有8人回复
-
欢迎发来filecode的Mz6后的代码验证其规律
已经有115人回复
-
filecode，4个jtjc了
已经有8人回复
-
2027广东省杰青
已经有10人回复
-
朋友圈看到的
已经有8人回复
-
时间戳变了，能看出什么问题？
已经有14人回复
-
咱们一起用铁证分析2026国家社科基金中标与否
已经有30人回复
-
今天放榜吗？
已经有11人回复
-
快农历七夕节了，轻松一下，男人悄悄话，女施主请不要进来。
已经有7人回复
-
什么时候开奖？
已经有6人回复
1
 |
2楼2006-05-28 08:02:45
