spek

Acoustic spectrum analyser
git clone http://git.hanabi.in/repos/spek.git
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commit bc5214b3e1b3afcc7c9430a75625ad9a41a8ea38
parent 968c1644d2da7674cc5a893f1878283fe5b41d8b
Author: Daniel Hams <daniel.hams@gmail.com>
Date:   Sun, 24 Apr 2011 19:54:25 +0800

Use Hann window function instead of Hamming (issue 48)

This helps to clear up spectral bleeding.

Signed-off-by: Alexander Kojevnikov <alexander@kojevnikov.com>

Diffstat:
Msrc/spek-pipeline.vala | 5++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/spek-pipeline.vala b/src/spek-pipeline.vala @@ -243,8 +243,11 @@ namespace Spek { prev_head = head; for (int i = 0; i < nfft; i++) { float val = input[(input_size + head - nfft + i) % input_size]; + // TODO: allow the user to chose the window function // 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.execute ();