Bug #1492
Loudness script issues
| Status: | New | Start date: | 2015-12-09 | |
|---|---|---|---|---|
| Priority: | Normal | Due date: | ||
| Assignee: | - | % Done: | 0% | |
| Category: | - | |||
| Target version: | - |
Description
The loudness calculation seems off, partly due this error:
maxI = floor( length(vector)/olapSize - winSize/olapSize + 1 );
should be
maxI = floor( length(vector)/(winSize-olapSize) - winSize/(winSize-olapSize) + 1 );
(The ITU_R BS.1770 standard says the overlap between each gating block must be 75% of block duration. Consider a block length of 100 samples (say). Overlap between consecutive blocks must be 75 samples. So if the total duration of signal is 150 samples, then there will be 3 blocks formed: Samples 1-100, 26-125, and 51-150. )
And probably similar with the 'blockEnergy' calculation.
But also, the filter coefficients may be off, and should change with sample rate.