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csteinmetz1 / pyloudnorm

Flexible audio loudness meter in Python with implementation of ITU-R BS.1770-4 loudness algorithm
https://www.christiansteinmetz.com/projects-blog/pyloudnorm
MIT License
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Wrong 500 hz peaking filter gain in fenton/lee implementation? #56

Open iver56 opened 1 year ago

iver56 commented 1 year ago

Here's a figure from the Fenton/Lee 2017 paper. We can see the peak at ~500 hz

bilde

However, in the implementation in pyloudnorm, the 500 hz peaking filter seems to have gain set to 0 dB, so it doesn't do anything:

https://github.com/csteinmetz1/pyloudnorm/blob/1fb914693e07f4bea06fdb2e4bd2d6ddc1688a9e/pyloudnorm/meter.py#L126

I'm not sure what exact value it should be set to, but from the plot I can see that it should be somewhere close to 3 dB