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Use Hann window function instead of Hamming (issue 48)

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This helps to clear up spectral bleeding.

Signed-off-by: Alexander Kojevnikov <alexander@kojevnikov.com>
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Daniel Hams 2011-04-24 19:54:25 +08:00 committed by Alexander Kojevnikov
parent 968c1644d2
commit bc5214b3e1
1 changed files with 4 additions and 1 deletions
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src/spek-pipeline.vala
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@ -243,8 +243,11 @@ namespace Spek {
prev_head = head; prev_head = head;
for (int i = 0; i < nfft; i++) { for (int i = 0; i < nfft; i++) {
float val = input[(input_size + head - nfft + i) % input_size]; float val = input[(input_size + head - nfft + i) % input_size];
// TODO: allow the user to chose the window function
// Hamming window. // Hamming window.
val *= 0.53836f - 0.46164f * coss[i]; // val *= 0.53836f - 0.46164f * coss[i];
// Hann window.
val *= 0.5f * (1f - coss[i]);
fft.input[i] = val; fft.input[i] = val;
} }
fft.execute (); fft.execute ();