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| author | Jamie Bullock <jamie@postlude.co.uk> | 2006-10-08 15:31:40 +0000 |
|---|---|---|
| committer | Jamie Bullock <jamie@postlude.co.uk> | 2006-10-08 15:31:40 +0000 |
| commit | 9bcdb2f6cb48da938975f618e36ebd54f67766cb (patch) | |
| tree | 77df7ce218d046107be383e5cca45e979eee362e /src | |
| parent | 2260b6a200016010fa9704dd3024d2c28b4fee74 (diff) | |
| download | LibXtract-9bcdb2f6cb48da938975f618e36ebd54f67766cb.tar.gz LibXtract-9bcdb2f6cb48da938975f618e36ebd54f67766cb.tar.bz2 LibXtract-9bcdb2f6cb48da938975f618e36ebd54f67766cb.zip | |
Added spectral centroid
Diffstat (limited to 'src')
| -rw-r--r-- | src/libxtract.c | 1 | ||||
| -rw-r--r-- | src/scalar.c | 19 |
2 files changed, 20 insertions, 0 deletions
diff --git a/src/libxtract.c b/src/libxtract.c index b9a98ef..8202f6d 100644 --- a/src/libxtract.c +++ b/src/libxtract.c @@ -29,6 +29,7 @@ int(*xtract[])(float *, int, void *, float *) = { xtract_average_deviation, xtract_skewness, xtract_kurtosis, + xtract_centroid, xtract_irregularity_k, xtract_irregularity_j, xtract_tristimulus_1, diff --git a/src/scalar.c b/src/scalar.c index 1cc3128..111c300 100644 --- a/src/scalar.c +++ b/src/scalar.c @@ -84,6 +84,25 @@ int xtract_kurtosis(float *data, int N, void *argv, float *result){ } + +int xtract_centroid(float *data, int N, void *argv, float *result){ + + int n = N; + + float *freqs, *amps, FA, A; + + freqs = data; + amps = data + (N >> 1); + + while(n--){ + FA += freqs[n] * amps[n]; + A += amps[n]; + } + + *result = FA / A; + +} + int xtract_irregularity_k(float *data, int N, void *argv, float *result){ int n, |