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| help me in FFT explanation http://forum.alglib.net/viewtopic.php?f=2&t=353 |
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| Author: | oleg123 [ Mon May 09, 2011 10:50 am ] |
| Post subject: | help me in FFT explanation |
I would like to use this LIB in my study. I have i.e. one WAVE file: - an audio 10 sec - 1 channel – mono - 44100 Sample/sec - 8 bit/sample (1byte). The length of the audio is 10sec*1 channel *1 byte/sample*44100 sample/sec=4.410.000 byte. What I want is to get amplitude and a frequency for each sample, update them and write back to the WAVE file. I am going to use the FFT and your method for it xalglib.fftr1d(x, f), where x - is an array of samples and f - is an output array. This output array consists of 2 subsets: real and imagine. How can I use these subsets for getting frequencies and amplitudes? |
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