Bark Filter for Android

11 things about Bark Filter

1. The advantage of multiband compression over full-bandwidth compression is that unneeded audible gain changes or "pumping" in other frequency bands is not caused by changing signal levels in a single frequency band.

2. For this reason Bark contains a filter bank with 27 very steep bandpass filters matching the critical bandwidth characteristic of the human ear.

3. The multi band filter in Bark takes the approach to match the reception characteristic of the gate where all sounds must pass through: the human ear.

4. Bark can act both as single band compressor and with up to 27 bands in multiband mode by linking critical bands.

5. In fact, the human ear have also its own built in multi band compression system which are based on the critical bands.

6. Why the name Bark ? The Bark scale is a frequency scale on which equal distances correspond with perceptually equal distances.

7. The ear behaves as if it contains a bank of filters, each filter passing frequencies within their respective critical band.

8. Two tones apart more than the frequency dependant critical bandwidth are perceived as separate tones.

9. Multiband compressors can act differently on different frequency bands.

10. Above about 500 Hz this scale is more or less equal to a logarithmic frequency axis.

11. Below 500 Hz the Bark scale becomes more and more linear.