Vee如何缩放fft的幅度？

尼克，除非你特别需要在频域中拥有“正确”的绝对比例，否则我不会使用缩放功能。
只需做fFT，乘以你的过滤函数并做IFFT .-- Bill OssmannPhilips Ultrasound“Nick Evans”于2006年4月18日上午11:39:16写道：>大家好>>有人能指出我的方向吗
如何缩放逆fft的幅度>。
Vee具有如何缩放fft的幅度的示例，使得频率>域中的频谱峰值具有与时域中的幅度相等的幅度。
我>基本上使用此功能将波形转换为>频域。
然后我用一些整形>曲线操纵数据，我想将它转换回时域。
>问题是，如果我严格颠倒“scale fft”中的过程，它并不总能在时间>域中给出正确的幅度。
我有时会在时域中得到大量的数据。>>任何帮助都将不胜感激。>>谢谢>> Nick >> ------您目前订阅了%% list.name %% as：％
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     以下为原文

  Nick,

Unless you have a particular need to have the "correct" absolute scale in
the frequency domain, I would not use the scaling function. Just do the
FFT, multiply by your filter function and do the IFFT.
--
Bill Ossmann
Philips Ultrasound


"Nick Evans" wrote on 04/18/2006 11:39:16 AM:

> Hi All
>
> Can anyone point me in the direction of how to scale the amplitude
> of an inverse fft.   Vee has an example of how to scale the
> amplitude of an fft such that the spectral peaks in the frequency
> domain have amplitudes equal to those in the time domain.  I am
> using this function basically to convert a waveform into the
> frequency domain.  Then I’m manipulating the data with some shaping
> curves and I want to convert it back to the time domain.  The
> problem is that if I strictly reverse the process in the “scale fftâ€
> it does not always give me the correct amplitude back in the time
> domain.   I sometimes end up with huge numbers in the time domain.
>
> Any help would be greatly appreciated.
>
> Thanks
>
> Nick
>
> ---
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大家好AllCan任何人都指出我如何缩放逆fft的幅度。
Vee具有如何缩放fft的幅度的示例，使得频域中的频谱峰值具有与时域中的幅度相等的幅度。
我正在使用此功能基本上将波形转换为频域。
然后我用一些塑形曲线操纵数据，我想将它转换回时域。
问题是，如果我严格颠倒“scalefft”中的过程，它并不总能在时域中给我正确的幅度。
我有时会在时域中获得巨大的数字。任何帮助都将非常感谢。谢谢尼克---您目前订阅了vrf：r***@soco.agilent.com要订阅，请发送电子邮件至：“vrf-request @
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     以下为原文

  Hi All Can anyone point me in the direction of how to scale theamplitude of an inverse fft.   Vee has an example of how to scale the amplitudeof an fft such that the spectral peaks in the frequency domain have amplitudesequal to those in the time domain.  I am using this function basically toconvert a waveform into the frequency domain.  Then I’m manipulating thedata with some shaping curves and I want to convert it back to the timedomain.  The problem is that if I strictly reverse the process in the “scalefft” it does not always give me the correct amplitude back in the timedomain.   I sometimes end up with huge numbers in the time domain. Any help would be greatly appreciated. Thanks Nick---You are currently subscribed to vrf as: [email=r***@soco.agilent.com]r***@soco.agilent.com[/email]To subscribe please send an email to: "vrf-request@lists.it.agilent.com" with the word subscribe in the message body.To unsubscribe send a blank email to "leave-vrf@it.lists.it.agilent.com".To send messages to this mailing list,  email "vrf@agilent.com".  If you need help with the mailing list send a message to"owner-vrf@it.lists.it.agilent.com".Search the "unofficial vrf archive" at "www.oswegosw.com/vrf_archive/".

大家好吧，任何人都可以指出我如何缩放逆fft的幅度.Vee有一个例子来说明如何缩放fft的幅度，使得频域中的频谱峰值具有与时间相等的幅度
domain.Â我使用这个函数基本上将波形转换为频域。然后我用一些整形曲线操纵数据，我想将它转换回时域。问题是，如果我
严格地反转“scale fft”中的过程并不总能在时域中给出正确的幅度。我有时会在时域中得到大量的数字。任何帮助都会非常感激。谢谢尼克---
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     以下为原文

  Hi All

 

Can anyone point me in the direction of how to scale the amplitude of an inverse fft.   Vee has an example of how to scale the amplitude of an fft such that the spectral peaks in the frequency domain have amplitudes equal to those in the time domain.  I am using this function basically to convert a waveform into the frequency domain.  Then I’m manipulating the data with some shaping curves and I want to convert it back to the time domain.  The problem is that if I strictly reverse the process in the “scale fft† it does not always give me the correct amplitude back in the time domain.   I sometimes end up with huge numbers in the time domain.

 

Any help would be greatly appreciated.

 

Thanks

 

Nick


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