From beginning to end of signal clean from noise.how fft works?to filter noise from signal.and what kind operation its?

  • To explain beginning to end is often an entire semester - this question is far too broad, unless you want a generic answer - which probably won't help you at all. What are you wanting to do with an FFT? What kind of noise? – Rory Alsop Oct 24 '18 at 16:21
  • hello sir,firstly i want a explanation about how FFT can reduce noise in signal based on snr.the signal will get from the arc fault generator with 10 kv supply and will measure using an antenna method to detection of arc.after that,the data signal from antenna will show at oscilloscope.after get all the signal fault,it will transfer to laptop using csv file to transfer the signal graph to the matlab.on the matlab,we will add some noise and using FFT and DWT technique to remove the noise and make some comparison between these two method.i hope u can teach me about this communication system. – Hafis Radzi Nov 4 '18 at 18:38

Audio de-noising is usually achieved using a multi-band "expander". Expanders are dynamics controls that are best understood as the 'opposite' of a 'compressor'.

Typical dynamics controls work on between 1 and 6 bands for normal compression/expansion operations. Denoising expanders might work on hundreds of bands depending on the complexity of the denoiser.

The use of an FFT will depend entirely on the design of the expander stage.

  • hello mark,thanks for your responses,i hope that explanation about step by step that how FFT can remove noise on signal from arc fault(to get the real fault signal without noise) and what fft do to remove these noise.thanks sir,hope u can response. – Hafis Radzi Nov 4 '18 at 18:44

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